{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-9853573","patent":{"patent_number":"US-9853573","title":"Grid-tie inverter with active power factor correction","assignee":null,"inventors":[],"filing_date":"2016-03-28T00:00:00.000Z","publication_date":"2017-12-26T00:00:00.000Z","cpc_codes":["H02M","H02J","H02J","H02M","H02M","H02M","H02M","H02M","H02M","H02J","H02J","H02M","H02M","H02M","H02M"],"num_claims":25,"abstract":"A grid-tie inverter (the “inverter”) may include a power converter that receives a direct current (DC) output voltage from a DC input power source, and generates an alternating current (AC) output voltage for transmission to a utility power grid. The inverter may also include a system controller that regulates the AC output voltage to efficiently transfer power to the utility power grid while a system AC load may be terminated across the output of the inverter. The inverter may also provide active power factor correction between the utility grid voltage and current. Furthermore, the inverter may also offer harmonic cancellation, which minimizes or eliminates the harmonic content out of the utility power grid voltage and current."},"analysis":{"summary":"The Grid-tie Inverter with Active Power Factor Correction (US-9853573) introduces a sophisticated solution for integrating direct current (DC) power sources, such as solar arrays, into alternating current (AC) utility grids. The core innovation lies in its ability to not only convert DC to AC but also to actively manage and enhance the quality of the power being fed into the grid.\n\nAt its heart, the system comprises a power converter that receives DC voltage and generates AC voltage for grid transmission. This is overseen by an intelligent system controller. The primary problem this patent solves is the inefficiency and instability often associated with traditional grid-tie inverters, particularly concerning poor power factor and harmonic distortion. These issues lead to energy losses, reduced grid reliability, and increased operational costs for utility providers.\n\nThe key technical approach involves two critical functions: active power factor correction and harmonic cancellation. Active power factor correction ensures that the AC output voltage and current are precisely regulated and in phase, maximizing the transfer of usable power and minimizing reactive power. Simultaneously, harmonic cancellation actively detects and eliminates unwanted harmonic content from the AC output, delivering a clean, stable power waveform to the grid.\n\nFrom a business perspective, this technology offers significant value. It enhances the efficiency and stability of renewable energy installations, making them more financially viable and attractive. It reduces wear and tear on grid infrastructure, lowers transmission losses, and improves overall power quality, benefiting utilities, energy producers, and consumers alike. The market opportunity is substantial, driven by the global push for renewable energy adoption and the increasing need for smart, resilient grid infrastructure. This innovation positions itself as a foundational technology for the next generation of energy management systems.","layman_explanation":"In today's world, we're all looking for cleaner ways to power our lives, and solar panels are a big part of that. But connecting these new, clean energy sources to our existing electrical grid isn't always as straightforward as flipping a switch. This is where the Grid-tie Inverter with Active Power Factor Correction patent comes into play, offering a critical upgrade to how we manage our energy.\n\n**1. What Problem Does This Solve?**\n\nThink of our electrical grid like a vast, interconnected highway system for electricity. When we add renewable energy sources like solar panels, they produce direct current (DC) power, which is like a one-way street. However, the grid operates on alternating current (AC) power, which is like a two-way highway. An 'inverter' acts as a translator, converting DC to AC so our solar power can join the grid.\n\nThe problem is, traditional inverters often send power onto the grid that isn't perfectly 'clean' or 'efficient.' Sometimes, the power flow isn't perfectly synchronized, leading to what's called a 'poor power factor.' This is like cars on the highway not driving in sync, causing traffic jams and wasting fuel (energy). Other times, the power signal can be 'noisy' or 'distorted' with 'harmonics,' which are like bumps and potholes on the highway. These issues can lead to energy losses, make the grid unstable, and even wear out electrical equipment faster. For businesses and utility companies, this translates to higher operating costs and less reliable power delivery.\n\n**2. How Does It Work?**\n\nThis innovative patent introduces a grid-tie inverter that goes far beyond simple conversion. It's like having a super-intelligent traffic controller and road maintenance crew built right into the system that connects your solar panels to the grid. Here's the conceptual breakdown:\n\n*   **Power Converter:** This is the basic translator that takes the one-way DC power from your solar panels and turns it into two-way AC power for the grid.\n*   **System Controller:** This is the 'brain' of the operation. It constantly monitors the AC power going out and the grid's needs in real-time. It's not just passively converting; it's actively managing.\n*   **Active Power Factor Correction:** Imagine the system controller ensuring that every car (unit of electricity) entering the highway (grid) is perfectly synchronized with the flow of traffic. It actively adjusts the timing and strength of the outgoing power so that virtually all the energy is 'useful' power, minimizing any 'idle' or 'wasted' power. This means more of your solar energy actually gets to homes and businesses, reducing losses.\n*   **Harmonic Cancellation:** The system controller also acts like that road maintenance crew, actively detecting and smoothing out any 'bumps' or 'potholes' (harmonics) in the electrical signal. It essentially 'cleans' the power before it enters the grid, ensuring a smooth and stable ride for all electrical devices.\n\nSo, this invention doesn't just connect your solar power; it optimizes it, ensuring it's of the highest quality and efficiency for the entire grid.\n\n**3. Why Does This Matter?**\n\nThis technology has significant implications for businesses, investors, and the future of energy:\n\n*   **Market Impact & Opportunities:** As the world moves rapidly towards renewable energy, the need for smart, efficient grid integration solutions is exploding. This patent positions companies to lead in this crucial area, offering solutions that enhance the value of every solar installation. It opens up opportunities in manufacturing, system integration, and even licensing the technology.\n*   **Competitive Advantages:** Companies adopting this technology will have a distinct edge. They can offer systems that provide superior energy efficiency, greater grid stability, and lower operational costs compared to competitors using older inverter designs. This leads to higher customer satisfaction and market share.\n*   **Potential ROI and Business Value:** For utility companies, this means less grid stress, reduced maintenance, and fewer energy losses, leading to substantial cost savings. For renewable energy project developers, it means a higher return on investment due to more efficient power delivery. For investors, it represents an opportunity to back a foundational technology that solves a critical problem in the global energy transition, with clear pathways to profitability through improved performance and reliability.\n\n**4. What's Next?**\n\nThis patent sets a new standard for grid-tie inverters. We can expect to see this kind of active power management become a standard feature in future energy systems, enabling a more resilient and efficient smart grid. Its adoption will accelerate the integration of diverse renewable sources, paving the way for a truly sustainable and robust energy infrastructure. It's a key piece in the puzzle of modernizing our power networks and making green energy truly green and effective.","technical_analysis":"The Grid-tie Inverter with Active Power Factor Correction (US-9853573) represents a significant advancement in power electronics for distributed generation. This patent details a sophisticated inverter system designed to seamlessly interface DC power sources with the AC utility grid while actively managing critical power quality parameters.\n\n**Technical Architecture:**\nAt its core, the invention consists of a power converter and a system controller. The power converter is responsible for the fundamental DC-to-AC conversion. It receives a DC output voltage from a DC input power source, such as a photovoltaic array or a battery bank. This DC voltage is then processed through a series of power electronic stages—typically a DC-DC boost converter followed by a DC-AC inverter (e.g., a full-bridge or multi-level inverter topology)—to generate the desired AC output voltage. The choice of switching devices (e.g., IGBTs, MOSFETs, or newer SiC/GaN devices) and their associated gate drivers is crucial for efficiency and high-frequency operation.\n\n**Implementation Details and Algorithm Specifics:**\nCentral to the system's intelligence is the system controller, often realized using a high-performance Digital Signal Processor (DSP) or an advanced microcontroller. This controller continuously monitors critical parameters, including the DC input voltage, AC output voltage, and AC output current, using precise sensing mechanisms. The regulation of the AC output voltage is achieved through advanced Pulse Width Modulation (PWM) techniques applied to the inverter stage. The controller generates appropriate switching signals to shape the AC output waveform.\n\n**Active Power Factor Correction (APFC):** The patent's APFC mechanism is a key innovation. Instead of passively correcting the power factor, this system actively adjusts the phase relationship between the utility grid voltage and current. The controller measures the instantaneous grid voltage and then generates a reference current waveform that is perfectly in phase with this voltage. A current control loop (e.g., a Proportional-Resonant controller for AC signals or a dq-frame Proportional-Integral controller) then forces the inverter's output current to track this reference. This dynamic control ensures that the reactive power exchanged with the grid is minimized, ideally achieving a power factor close to unity. This not only optimizes power transfer but also reduces I²R losses in transmission lines and frees up grid capacity.\n\n**Harmonic Cancellation:** The invention further distinguishes itself with harmonic cancellation capabilities. Harmonics are unwanted integer multiples of the fundamental frequency that distort the sinusoidal waveform, leading to power quality issues. The system controller employs real-time harmonic detection algorithms, which could involve Fast Fourier Transforms (FFTs), Discrete Fourier Transforms (DFTs), or adaptive filtering techniques. Once detected, the controller calculates and injects precisely compensating harmonic currents into the grid. These injected currents are designed to be out of phase with the existing harmonics, effectively canceling them out. This active filtering maintains a clean sinusoidal output, protecting sensitive loads and grid equipment from harmonic distortion.\n\n**Integration Patterns and Performance Characteristics:**\nThis inverter is designed for seamless integration into various grid architectures, from residential rooftop solar to larger commercial installations. Its ability to maintain power quality even when a system AC load is terminated across its output highlights its robustness and adaptability to dynamic load conditions. Performance characteristics include high conversion efficiency (due to optimized power factor), low Total Harmonic Distortion (THD) for current and voltage, and rapid response to grid disturbances. The efficient transfer of power is paramount, ensuring that the maximum amount of generated DC power is converted into usable, high-quality AC power for the grid.\n\n**Code-Level Implications:**\nImplementing this technology requires sophisticated firmware for the system controller. This involves real-time operating systems (RTOS) to manage multiple control loops concurrently, high-speed Analog-to-Digital Converters (ADCs) for accurate sensing, and Digital-to-Analog Converters (DACs) for control outputs. The code base would include modules for:\n*   PWM generation with dead-time control.\n*   Voltage and current sensing and filtering.\n*   Grid synchronization (e.g., Phase-Locked Loop - PLL).\n*   APFC algorithm (e.g., dq-frame control, PR control).\n*   Harmonic detection and cancellation algorithms.\n*   Fault detection and protection mechanisms.\n*   Communication protocols for monitoring and control.\nThis level of complexity demands robust software engineering practices and thorough validation to ensure reliability and performance in diverse grid environments.","business_analysis":"The Grid-tie Inverter with Active Power Factor Correction (US-9853573) emerges as a pivotal innovation poised to significantly impact the renewable energy and power electronics sectors. Its core capabilities in active power factor correction and harmonic cancellation address critical pain points in grid integration, unlocking substantial market opportunities and competitive advantages.\n\n**Market Opportunity Size:** The global market for grid-tie inverters is projected to grow substantially, driven by increasing renewable energy adoption, favorable government policies, and declining costs of solar and wind power. The enhanced efficiency and grid stability offered by this patent position it perfectly within this expanding market. With utilities globally facing challenges of grid modernization and managing distributed energy resources, the demand for 'smart' inverters that actively improve power quality is immense. This technology caters to residential, commercial, and utility-scale solar installations, as well as other DC-based renewable energy sources. The market for power quality solutions alone is a multi-billion dollar industry, and this invention integrates those solutions directly into the primary energy conversion device, creating a compelling value proposition.\n\n**Competitive Advantages:** This innovation provides several distinct competitive advantages:\n\n1.  **Superior Power Quality:** By actively correcting power factor and canceling harmonics, the system delivers cleaner, more stable power than many conventional inverters. This reduces grid stress, minimizes energy losses, and extends the lifespan of connected equipment.\n2.  **Enhanced Grid Stability:** The precise regulation of AC output voltage and current contributes directly to grid stability, a critical factor for utility operators dealing with intermittent renewable generation. This reduces the need for external power quality devices.\n3.  **Increased Efficiency and ROI:** Optimal power transfer means more usable energy reaches the grid, translating to higher revenue for energy producers and lower operational costs for utilities through reduced losses and maintenance.\n4.  **Regulatory Compliance:** Adherence to strict grid codes and power quality standards is simplified, as the inverter proactively manages these parameters.\n\n**Revenue Potential and Business Models:** Companies licensing or developing products based on this patent can tap into multiple revenue streams:\n\n*   **Hardware Sales:** Manufacturing and selling advanced grid-tie inverters incorporating this technology.\n*   **System Integration:** Offering integrated energy management solutions that leverage the superior performance of these inverters.\n*   **Licensing:** Licensing the patented technology to other inverter manufacturers, creating a royalty-based revenue stream.\n*   **Value-Added Services:** Providing maintenance, monitoring, and optimization services for systems utilizing this advanced inverter.\n\nThe enhanced efficiency and reliability can justify a premium pricing model compared to standard inverters, driving higher margins.\n\n**Strategic Positioning:** This technology allows companies to strategically position themselves as leaders in 'smart grid' solutions and advanced power electronics. It moves beyond commodity inverter manufacturing towards high-value, intelligent grid components. Partnerships with utilities, grid operators, and large-scale renewable project developers would be crucial for market penetration and establishing industry standards. The focus on power quality and grid resilience aligns perfectly with global energy policy objectives, offering a strong narrative for market leadership.\n\n**ROI Projections:** Investing in this technology, either through R&D, manufacturing, or licensing, promises a strong return on investment. The tangible benefits of reduced energy losses, improved grid reliability, and lower maintenance costs translate directly into operational savings for end-users, which can be monetized through competitive product offerings. For a utility, even a fractional improvement in system-wide efficiency and stability can result in millions in annual savings. For an inverter manufacturer, offering a product with demonstrably superior power quality and efficiency can capture significant market share and command higher prices, leading to accelerated revenue growth and profitability.","faqs":[{"answer":"The Grid-tie Inverter with Active Power Factor Correction, referenced in patent US-9853573, is an advanced power electronics device designed to connect direct current (DC) power sources, such as solar panels or battery storage, to an alternating current (AC) utility power grid. Unlike conventional grid-tie inverters, this innovation incorporates sophisticated control mechanisms to actively manage the quality of the power being delivered to the grid.\n\nIts primary function is to convert DC voltage from a renewable energy source into AC voltage suitable for the grid. However, its distinguishing features are active power factor correction and harmonic cancellation. These capabilities ensure that the power transferred to the utility grid is not only converted but also optimized for efficiency and stability.\n\nThis system includes a power converter and an intelligent system controller. The controller meticulously regulates the AC output voltage, ensuring efficient power transfer even under varying load conditions. It's a critical component for modernizing energy infrastructure, making renewable energy integration smoother and more reliable. This technology is set to become a cornerstone of smart grid development.","question":"What is Grid-tie Inverter with Active Power Factor Correction?"},{"answer":"The Grid-tie Inverter with Active Power Factor Correction operates through a combination of power conversion and intelligent control. First, a power converter receives the DC output voltage from a source like a solar array. It then transforms this DC power into AC power suitable for the utility grid.\n\nThe core of its advanced functionality lies with its system controller. This controller continuously monitors the grid voltage and current. It employs active power factor correction by dynamically adjusting the inverter's output to ensure that the AC voltage and current waveforms are perfectly in phase. This minimizes 'reactive power,' which is wasted energy, thereby maximizing the transfer of useful power to the grid.\n\nSimultaneously, the system performs harmonic cancellation. Harmonics are distortions in the electrical waveform that can degrade power quality. The controller actively detects these harmful harmonic components and generates compensating currents to effectively cancel them out, delivering a clean, sinusoidal power signal. This dual-action approach ensures high-quality, efficient power delivery to the utility grid, even when local AC loads are connected across the inverter's output.","question":"How does Grid-tie Inverter with Active Power Factor Correction work?"},{"answer":"The Grid-tie Inverter with Active Power Factor Correction addresses significant challenges associated with integrating renewable energy sources into the traditional electrical grid. The primary problems it solves are poor power factor and harmonic distortion.\n\nPoor power factor leads to inefficient energy transfer, where a portion of the electrical current does no useful work but still flows through the grid. This results in energy losses, reduced grid capacity, and increased operational costs for utilities. Harmonic distortion, on the other hand, refers to unwanted irregularities in the electrical waveform that can cause overheating in equipment, interfere with sensitive electronics, and generally degrade the reliability and stability of the power supply.\n\nBy actively correcting the power factor and canceling harmonics, this innovation ensures that power from renewable sources is injected into the grid in its cleanest and most efficient form. This mitigates grid instability, reduces transmission losses, extends the lifespan of grid infrastructure, and ultimately makes renewable energy integration more economically viable and environmentally effective. It transforms a potential source of grid problems into an active contributor to grid health.","question":"What problem does Grid-tie Inverter with Active Power Factor Correction solve?"},{"answer":"The patent US-9853573 for the Grid-tie Inverter with Active Power Factor Correction does not list specific inventors or an assignee in the provided data. Patent filings typically credit the individual inventors and the company or organization to which the patent rights are assigned. Without this information readily available, it is not possible to specify the individual inventors or the assignee of this particular patent.\n\nHowever, the nature of such a sophisticated invention suggests it likely emerged from a team of highly skilled engineers and researchers specializing in power electronics, renewable energy systems, and control theory. Innovations like the Grid-tie Inverter with Active Power Factor Correction are often the result of extensive research and development efforts within academic institutions, corporate R&D departments, or specialized technology firms dedicated to advancing energy efficiency and grid integration. The collective expertise required to develop active power factor correction and harmonic cancellation capabilities within a single device is substantial.","question":"Who invented Grid-tie Inverter with Active Power Factor Correction?"},{"answer":"The Grid-tie Inverter with Active Power Factor Correction offers several key benefits that significantly enhance renewable energy integration and grid performance. Firstly, it ensures **superior energy efficiency** by actively correcting the power factor to near unity. This means virtually all the power generated is useful, active power, minimizing losses in transmission and distribution and maximizing the energy harvest from renewable sources.\n\nSecondly, it provides **enhanced grid stability and reliability** through its harmonic cancellation capabilities. By eliminating harmful distortions from the power waveform, the system prevents equipment overheating, reduces interference, and contributes to a cleaner, more robust electrical grid. This is crucial for utilities managing the complexities of distributed generation.\n\nThirdly, it leads to **reduced operational costs** for utilities and renewable energy operators. Lower transmission losses, less stress on grid infrastructure, and fewer power quality-related issues translate directly into savings on maintenance and operational overhead. Additionally, the integrated nature of the solution can **simplify system design** and reduce the need for expensive external power quality devices. The Grid-tie Inverter with Active Power Factor Correction therefore represents a significant step towards a more economical and sustainable energy future, benefiting both producers and consumers of clean energy.","question":"What are the key benefits of Grid-tie Inverter with Active Power Factor Correction?"},{"answer":"The Grid-tie Inverter with Active Power Factor Correction significantly differentiates itself from prior art in grid-tie inverter technology by offering integrated, active, and comprehensive power quality management. Most conventional grid-tie inverters primarily focus on DC-to-AC conversion and basic grid synchronization, often providing only passive or limited active power factor correction, if any.\n\nPrior art solutions typically either accept a suboptimal power factor or rely on external, often bulky and costly, equipment like power factor correction capacitors or separate active power filters to mitigate issues. Similarly, harmonic distortion in prior art is often addressed with passive filters, which are less adaptable to varying grid conditions, or by simply tolerating higher levels of harmonics.\n\nThis invention, however, embeds sophisticated active power factor correction and real-time harmonic cancellation directly within the inverter's system controller. It proactively and dynamically adjusts the power output to achieve near-unity power factor and actively eliminates harmonic content at the source. This integrated approach simplifies system design, reduces overall costs, and provides superior, continuous power quality under diverse operating conditions, making the Grid-tie Inverter with Active Power Factor Correction a more intelligent and effective solution for modern grids.","question":"How is Grid-tie Inverter with Active Power Factor Correction different from prior art?"},{"answer":"The Grid-tie Inverter with Active Power Factor Correction is poised to significantly impact several key industries. The most direct impact will be on the **renewable energy sector**, particularly solar photovoltaic (PV) and wind power, by making the integration of these sources into the grid more efficient and reliable. This will benefit solar panel manufacturers, wind turbine developers, and renewable energy project developers by enhancing the value and performance of their installations.\n\nSecondly, the **power electronics industry** will see a demand for more advanced components and control systems capable of supporting the sophisticated algorithms required by this technology. Manufacturers of inverters, semiconductors, and control processors will be directly affected. Thirdly, **utility companies and grid operators** stand to gain immensely. By improving grid stability, reducing transmission losses, and mitigating power quality issues, the Grid-tie Inverter with Active Power Factor Correction helps utilities manage distributed energy resources more effectively, reduce operational costs, and modernize their infrastructure.\n\nFinally, industries reliant on **high-quality power**, such as manufacturing, data centers, and telecommunications, will indirectly benefit from a cleaner, more stable grid supply. The broad applicability of this innovation across the energy value chain underscores its potential to drive significant change and foster sustainable growth in the global energy transition.","question":"What industries will Grid-tie Inverter with Active Power Factor Correction impact?"},{"answer":"The patent for the Grid-tie Inverter with Active Power Factor Correction, US-9853573, was filed on **March 28, 2016**. It was subsequently published on **December 26, 2017**. The period between the filing date and the publication date allows the patent office to examine the application for novelty, non-obviousness, and utility, ensuring it meets all legal requirements for patentability.\n\nThe filing date marks the official submission of the invention to the patent office, establishing priority for the claims made. The publication date signifies when the patent document becomes publicly accessible, allowing others to review the details of the invention. This timeline indicates that the underlying research and development for the Grid-tie Inverter with Active Power Factor Correction were conducted prior to 2016, reflecting a forward-thinking approach to addressing emerging challenges in renewable energy integration. The publication of this patent in late 2017 made this advanced technology publicly available for study and potential commercialization, influencing subsequent innovations in the field of power electronics and grid management.","question":"When was Grid-tie Inverter with Active Power Factor Correction filed/granted?"},{"answer":"The commercial applications of the Grid-tie Inverter with Active Power Factor Correction are diverse and impactful across the energy sector. Firstly, in **residential and commercial solar installations**, this technology enhances the efficiency and reliability of rooftop PV systems. Homeowners and businesses can achieve greater energy savings and a higher return on their solar investment due to optimized power transfer and reduced losses.\n\nSecondly, in **utility-scale renewable energy projects**, such as large solar farms or wind parks, the Grid-tie Inverter with Active Power Factor Correction is crucial for maintaining grid stability and ensuring compliance with stringent grid codes. Its ability to actively manage power quality makes large-scale renewable integration smoother and more economically viable for developers and operators.\n\nThirdly, it has significant applications in **microgrids and distributed energy resource (DER) management systems**. By providing clean, stable power at the local level, this technology supports the robust operation of microgrids, whether they are connected to the main grid or operating in islanded mode. Furthermore, it can be integrated into **energy storage systems** to optimize their grid interaction. The Grid-tie Inverter with Active Power Factor Correction is therefore a versatile technology that can be deployed wherever DC power needs to be efficiently and cleanly converted for AC grid consumption, driving efficiency and stability in various commercial energy applications.","question":"What are the commercial applications of Grid-tie Inverter with Active Power Factor Correction?"},{"answer":"Building upon the foundation of the Grid-tie Inverter with Active Power Factor Correction, future developments are expected to push the boundaries of intelligent grid interaction and energy management. One key area is the integration of **advanced artificial intelligence (AI) and machine learning (ML)** algorithms. These could enable predictive power quality management, allowing the inverter to anticipate grid disturbances and proactively adjust its output for even greater stability and efficiency. AI could also optimize energy dispatch based on real-time grid conditions, weather forecasts, and energy pricing.\n\nAnother development will likely be enhanced **grid support functions** beyond power factor correction and harmonic cancellation. This includes capabilities like synthetic inertia, fault ride-through, and black start features, transforming inverters into active participants in grid stabilization and resilience. These features will be critical for grids with very high penetrations of renewable energy.\n\nFurthermore, increased focus on **cybersecurity** will be paramount. As inverters become more intelligent and networked, protecting them from cyber threats will be essential to maintain grid integrity. We can also expect further advancements in **power semiconductor technology** (e.g., next-generation SiC and GaN devices) to achieve even higher efficiencies and power densities, making the Grid-tie Inverter with Active Power Factor Correction smaller, more cost-effective, and more powerful. These future developments will solidify the role of this technology as a cornerstone for truly smart, self-healing, and sustainable energy grids.","question":"What are the future developments expected for Grid-tie Inverter with Active Power Factor Correction?"}],"topics":["Grid-tie Inverter with Active Power Factor Correction","US-9853573","grid-tie inverter","active power factor correction","harmonic cancellation","transition","dominated","distributed"],"tech_cluster":null},"seo":{"title":"Grid-tie Inverter with Active Power Factor Correction - US-9853573","description":"Discover US-9853573: Grid-tie Inverter with Active Power Factor Correction. Enhances grid stability, eliminates harmonics, and optimizes power transfer for renewables.","keywords":["Grid-tie Inverter with Active Power Factor Correction","US-9853573","grid-tie inverter","active power factor correction","harmonic cancellation","renewable energy integration","power quality","grid stability","power electronics","energy efficiency","solar inverter","patent analysis"]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-9853573","license":"CC-BY-4.0-like","license_terms":"AI-generated analysis on this page (summary, layman_explanation, technical_analysis, business_analysis, faqs) may be reused with attribution and a visible link back to the canonical URL above. Patent abstracts, claims, and bibliographic data are USPTO public domain.","required_link":"https://patentable.app/patents/US-9853573","citation_suggestion":"Patentable. \"Grid-tie inverter with active power factor correction\" (US-9853573). https://patentable.app/patents/US-9853573","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-9853573","json":"https://patentable.app/api/llm-context/US-9853573","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-06-06T05:33:23.879Z"}