# US 2026/0101419 A1 · Systems and methods for reducing noise from quasi-resonant induction control > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2026/0101419 A1 - Document ID: US20260101419A1 - Status: Published application - Kind: A1 - Application number: 18/906,916 - Filed: 2024-10-04 - Published: 2026-04-09 - Earliest claimed: 2024-10-04 - Assignees: Haier US Appliance Solutions, Inc. - Applicants: Haier US Appliance Solutions, Inc. - Inventors: Steven Michael Recio - Web page: https://patentgrep.com/patent/US20260101419A1 ## CPC - H05B 6/062: {for cooking plates or the like} - H05B 6/04: Sources of current - H05B 6/1245: {with special coil arrangements} - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL ## Abstract An induction heating system for an induction cooking appliance is provided. The induction heating system includes a bus capacitor configured to receive direct current (DC) power. The induction heating system further includes a first inverter system operatively coupled to the bus capacitor, the first inverter system configured to energize a first coil based at least in part on the DC power. The induction heating system further includes a second inverter system operatively coupled to the bus capacitor, the second inverter system configured to energize a second coil based at least in part on the DC power. The first inverter system is further configured to at least partially discharge the bus capacitor based at least in part on a start-up time of the second inverter system. ## Claims ### Claim 1 An induction heating system for an induction cooking appliance, the induction heating system comprising: a bus capacitor configured to receive direct current (DC) power; a first inverter system operatively coupled to the bus capacitor, the first inverter system configured to energize a first coil based at least in part on the DC power; and a second inverter system operatively coupled to the bus capacitor, the second inverter system configured to energize a second coil based at least in part on the DC power, wherein the first inverter system is further configured to at least partially discharge the bus capacitor based at least in part on a start-up time of the second inverter system. ### Claim 2 (depends on 1) The induction heating system of claim 1, wherein the first inverter system is configured to at least partially discharge the bus capacitor prior to the start-up time of the second inverter system. ### Claim 3 (depends on 2) The induction heating system of claim 2, wherein the first inverter system is configured to at least partially discharge the bus capacitor through the first coil. ### Claim 4 (depends on 1) The induction heating system of claim 1, wherein the first inverter system and the second inverter system are connected in parallel with the bus capacitor. ### Claim 5 (depends on 1) The induction heating system of claim 1, wherein the second inverter system is a quasi-resonant (QR) inverter system. ### Claim 6 (depends on 5) The induction heating system of claim 5, wherein the first inverter system is a half-bridge (HB) inverter system. ### Claim 7 (depends on 1) The induction heating system of claim 1, wherein the first inverter system is configured to at least partially discharge the bus capacitor based at least in part on the start-up time when the second inverter system is operating in a low-power mode. ### Claim 8 (depends on 1) The induction heating system of claim 1, wherein the first coil is associated with a first induction heating element of the induction cooking appliance and the second coil is associated with a second induction heating element of the induction cooking appliance. ### Claim 9 (depends on 1) The induction heating system of claim 1, further comprising: a rectifier circuit configured to provide the DC power from a line voltage signal received from an alternating current (AC) power supply, wherein the start-up time of the second inverter system corresponds to a zero cross of the line voltage signal. ### Claim 10 An induction heating system for an induction cooking appliance, the induction heating system comprising: a bus capacitor configured to receive direct current (DC) power; a half-bridge (HB) inverter system operatively coupled to the bus capacitor, the HB inverter system configured to energize a first coil based at least in part on the DC power; and a quasi-resonant (QR) inverter system operatively coupled to the bus capacitor, the QR inverter system configured to energize a second coil based at least in part on the DC power, wherein the HB inverter system is further configured to at least partially discharge the bus capacitor based at least in part on a start-up time of the QR inverter system. ### Claim 11 (depends on 10) The induction heating system of claim 10, wherein the HB inverter system is configured to at least partially discharge the bus capacitor prior to the start-up time of the QR inverter system. ### Claim 12 (depends on 10) The induction heating system of claim 10, wherein the HB inverter system and the QR inverter system are connected in parallel with the bus capacitor. ### Claim 13 (depends on 10) The induction heating system of claim 10, wherein the HB inverter system is configured to at least partially discharge the bus capacitor based at least in part on the start-up time when the QR inverter system is operating in a low-power mode. ### Claim 14 An induction cooking appliance, comprising: one or more induction heating elements; an induction heating system, comprising: a bus capacitor configured to receive direct current (DC) power; a first inverter system operatively coupled to the bus capacitor, the first inverter system configured to energize a first coil based at least in part on the DC power; and a second inverter system operatively coupled to the bus capacitor, the second inverter system configured to energize a second coil based at least in part on the DC power, wherein the first inverter system is further configured to at least partially discharge the bus capacitor based at least in part on a start-up time of the second inverter system. ### Claim 15 (depends on 14) The induction cooking appliance of claim 14, wherein the first inverter system is configured to at least partially discharge the bus capacitor prior to the start-up time of the second inverter system. ### Claim 16 (depends on 14) The induction cooking appliance of claim 14, wherein the first inverter system is configured to at least partially discharge the bus capacitor through the first coil. ### Claim 17 (depends on 14) The induction cooking appliance of claim 14, wherein the first inverter system and the second inverter system are connected in parallel with the bus capacitor. ### Claim 18 (depends on 17) The induction cooking appliance of claim 17, wherein the second inverter system is a quasi-resonant (QR) inverter system. ### Claim 19 (depends on 18) The induction cooking appliance of claim 18, wherein the first inverter system is a half-bridge (HB) inverter system. ### Claim 20 (depends on 14) The induction cooking appliance of claim 14, wherein the one or more induction heating elements comprises a first induction heating element and a second induction heating element, wherein the first coil is associated with the first induction heating element and the second coil is associated with the second induction heating element.