{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-8471488","patent":{"patent_number":"US-8471488","title":"Reducing total harmonic distortion in a power factor corrected flyback switch mode power supply","assignee":null,"inventors":[],"filing_date":"2011-02-28T00:00:00.000Z","publication_date":"2013-06-25T00:00:00.000Z","cpc_codes":["H02M"],"num_claims":17,"abstract":"Total harmonic distortion (THD) at the AC line input of a power factor corrected (PFC) flyback switch mode power supply (SMPS) is reduced by adding additional current injection to the current programming signal of a PFC controller during the period of the line cycle where the AC input current wave shape is most flattened, i.e., around the peak portion of the AC line voltage. The input current drawn by the PFC flyback SMPS will then more closely resemble a desired sinusoidal waveform. A voltage dependent non-linear resistance is coupled in parallel with the normal current injection resistor that supplies current to the PFC flyback controller multiplier input to inject appropriate values of additional current into the PFC flyback controller based upon the AC input voltage value(s) so as to better shape the AC input current to the desired sinusoidal waveform."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Reducing total harmonic distortion in a power factor corrected flyback switch mode power supply","description":"Total harmonic distortion (THD) at the AC line input of a power factor corrected (PFC) flyback switch mode power supply (SMPS) is reduced by adding additional current injection to the current programm","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-8471488","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-8471488","citation_suggestion":"Patentable. \"Reducing total harmonic distortion in a power factor corrected flyback switch mode power supply\" (US-8471488). https://patentable.app/patents/US-8471488","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-8471488","json":"https://patentable.app/api/llm-context/US-8471488","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-05-30T23:04:40.539Z"}