{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-11942871","patent":{"patent_number":"US-11942871","title":"Startup of secondary controller for primary controller powered from AC line","assignee":null,"inventors":[],"filing_date":"2020-12-18T00:00:00.000Z","publication_date":"2024-03-26T00:00:00.000Z","cpc_codes":["H02M","G06F","G06F","H02J","H02M","H02M","G06F","H02M","H02M"],"num_claims":20,"abstract":"A system includes a transformer, a first controller, a discharge circuit to discharge an external capacitor based on an undervoltage threshold, and a second controller. The second controller is coupled to the discharge circuit, and is also coupled to receive a rectified Ac voltage and to receive control signals from the first controller. The second controller includes a gate driver to turn on a primary field effect transistor (FET). The second controller also includes a startup controller coupled to the gate driver. The startup controller is configured to increase a duty cycle of the primary FET based on whether a control signal is received from the first controller. The startup controller is also configured to determine a current duty cycle of the primary FET and to turn off the primary FET based on whether the voltage of the AC-DC converter is above an undervoltage threshold."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Startup of secondary controller for primary controller powered from AC line","description":"A system includes a transformer, a first controller, a discharge circuit to discharge an external capacitor based on an undervoltage threshold, and a second controller. The second controller is couple","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-11942871","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-11942871","citation_suggestion":"Patentable. \"Startup of secondary controller for primary controller powered from AC line\" (US-11942871). https://patentable.app/patents/US-11942871","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-11942871","json":"https://patentable.app/api/llm-context/US-11942871","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-05-31T00:13:12.464Z"}