{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-8488338","patent":{"patent_number":"US-8488338","title":"Controller with valley switching and limited maximum frequency for quasi-resonant power converters","assignee":null,"inventors":[],"filing_date":"2011-01-19T00:00:00.000Z","publication_date":"2013-07-16T00:00:00.000Z","cpc_codes":["H02M","H02M"],"num_claims":15,"abstract":"A controller for a power converter is provided. The controller includes a PWM circuit, a detection circuit, a signal generation circuit and an oscillation circuit. The PWM circuit generates a switching signal coupled to switch a transformer of the power converter. A feedback signal is coupled to the PWM circuit to disable the switching signal. The detection circuit is coupled to the transformer via a resistor for generating a valley signal in response to a signal waveform of the transformer. The signal generation circuit is coupled to receive the feedback signal and the valley signal for generating an enabling signal. The oscillation circuit generates a maximum frequency signal. The maximum frequency signal associates with the enabling signal to generate a pulse signal. The feedback signal is correlated to an output load of the power converter. The maximum frequency of the pulse signal is limited."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Controller with valley switching and limited maximum frequency for quasi-resonant power converters","description":"A controller for a power converter is provided. The controller includes a PWM circuit, a detection circuit, a signal generation circuit and an oscillation circuit. The PWM circuit generates a switchin","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-8488338","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-8488338","citation_suggestion":"Patentable. \"Controller with valley switching and limited maximum frequency for quasi-resonant power converters\" (US-8488338). https://patentable.app/patents/US-8488338","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-8488338","json":"https://patentable.app/api/llm-context/US-8488338","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-05-30T19:33:33.464Z"}