# US 12,009,751 B2 · Power conversion device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,009,751 B2 - Document ID: US12009751B2 - Status: Granted - Kind: B2 - Application number: 17/707,427 - Filed: 2022-03-29 - Published: 2022-10-13 - Granted: 2024-06-11 - Earliest claimed: 2021-03-31 - Assignees: TDK Corporation - Applicants: TDK Corporation - Inventors: Tomokazu Ikarashi; Kimihiro Nishijima - Web page: https://patentgrep.com/patent/US12009751B2 ## CPC - H02M 1/0064: {Magnetic structures combining different functions, e.g. storage, filtering or transformation} - H02M 3/33569: {having several active switching elements (H02M3/3353 takes precedence)} - H02M 1/34: Snubber circuits - H02M 1/342: {Active non-dissipative snubbers} - H02M 3/156: with automatic control of output voltage or current, e.g. switching regulators - H02M 3/158: including plural semiconductor devices as final control devices for a single load - H02M 3/33507: {with automatic control of the output voltage or current, e.g. flyback converters (H02M3/33561, H02M3/33569 take precedence)} - H02M 1/0085: {Partially controlled bridges} - H02M 1/4233: {using a bridge converter comprising active switches} - Y02B 70/10: Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes - H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P) - Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS ## Abstract The power conversion device includes a converter including a main switch element, a main rectifying element, an output capacitor, and a primary winding of a coupled inductor and a resonance assist circuit based on a closed-loop circuit including a first series circuit having a secondary winding of the coupled inductor, a first rectifying element, and an auxiliary switch element, a second series circuit having a tertiary winding of the coupled inductor and a second rectifying element, and an auxiliary capacitor to which the first series circuit and the second series circuit are connected. The secondary winding and the tertiary winding are separate bodies and the first series circuit and the second series circuit are connected in parallel to the auxiliary capacitor, or the tertiary winding is integrated with the secondary winding. ## Claims ### Claim 1 A power conversion device comprising: a converter including a main switch element, a main rectifying element, an output capacitor, and a primary winding of a coupled inductor; and a resonance assist circuit based on a closed-loop circuit including a first series circuit having a secondary winding of the coupled inductor, a first rectifying element, and an auxiliary switch element, a second series circuit having a tertiary winding of the coupled inductor and a second rectifying element, and an auxiliary capacitor to which the first series circuit and the second series circuit are connected, wherein the secondary winding and the tertiary winding are separate bodies and the first series circuit and the second series circuit are connected in parallel to the auxiliary capacitor, or the tertiary winding is integrated with the secondary winding. ### Claim 2 (depends on 1) The power conversion device according to claim 1, further comprising a controller, wherein the controller is configured to turn on the main switch element after turning on the auxiliary switch element and then to turn off the main switch element after turning off the auxiliary switch element or simultaneously when turning off the auxiliary switch element. ### Claim 3 (depends on 2) The power conversion device according to claim 2, wherein the controller is configured to determine an ON timing of the main switch element using a voltage of the tertiary winding or an auxiliary winding of the coupled inductor and a voltage of the auxiliary capacitor. ### Claim 4 (depends on 1) The power conversion device according to claim 1, wherein the converter is a boost converter or a buck converter, and wherein the converter is configured to obtain a constant voltage source from a voltage of a second rectifying element via a rectifier diode. ### Claim 5 (depends on 1) The power conversion device according to claim 1, wherein a multiphase system including the main switch element and the main rectifying element is provided, and wherein the resonance assist circuit is a multiphase resonance assist circuit corresponding to multiple phases. ### Claim 6 (depends on 5) The power conversion device according to claim 5, wherein, in the multiphase resonance assist circuit, one or both of the auxiliary capacitor and the second rectifying element are shared between at least two phases. ### Claim 7 (depends on 1) The power conversion device according to claim 1, wherein the power conversion device is applied to a dual-boost PFC circuit connected to a single-phase AC input, wherein two boost circuits including the main switch element and the main rectifying element are provided, wherein the resonance assist circuit corresponds to the two boost circuits, and wherein the auxiliary switch element is shared in the resonance assist circuit. ### Claim 8 A power conversion device comprising: a converter including a main switch element, a main rectifying element, an output capacitor, and a primary winding of a coupled inductor; and a resonance assist circuit based on a closed-loop circuit including a first series circuit having a first rectifying element and a first auxiliary capacitor, a second series circuit having a second auxiliary capacitor and a second rectifying element, a third series circuit having a secondary winding of the coupled inductor and an auxiliary switch element and connected in parallel to the first series circuit and the second series circuit, and a third rectifying element arranged between an anode of the first rectifying element and a cathode of the second rectifying element. ### Claim 9 A power conversion device comprising: a converter including a main switch element, a main rectifying element, an output capacitor, and a primary winding of a coupled inductor; and a resonance assist circuit based on a closed-loop circuit including a first series circuit having a first rectifying element and a first auxiliary capacitor, a second series circuit having a second auxiliary capacitor and a second rectifying element, a third series circuit having a third rectifying element, a third auxiliary capacitor, and a fourth rectifying element, a fourth series circuit having a secondary winding of the coupled inductor and an auxiliary switch element and connected in parallel to the first series circuit, the second series circuit, and the third series circuit, a fifth rectifying element arranged between an anode of the first rectifying element and a cathode of the fourth rectifying element, and a sixth rectifying element arranged between a cathode of the second rectifying element and an anode of the third rectifying element. ### Claim 10 A power conversion device comprising: a converter including a main switch element, a main rectifying element, an output capacitor, and a primary winding of a coupled inductor, the polarity of a current of the primary winding switching between positive and negative states; and a resonance assist circuit based on a closed-loop circuit, wherein the closed-loop circuit includes a first series circuit having a secondary winding of the coupled inductor, a first rectifying element, and a first auxiliary switch that is driven when the polarity of the current of the primary winding is positive; a second series circuit having a tertiary winding of the coupled inductor and a second rectifying element; and a first auxiliary capacitor connected to the first series circuit and the second series circuit, wherein the secondary winding and the tertiary winding are separate bodies and the first series circuit and the second series circuit are connected in parallel to the first auxiliary capacitor or the tertiary winding is integrated with the secondary winding, wherein the closed-loop circuit further includes a third series circuit having a third rectifying element, a second auxiliary switch that is driven when the polarity of the current of the primary winding is negative, and the secondary winding; a fourth series circuit having the tertiary winding and a fourth rectifying element; and a second auxiliary capacitor connected to the third series circuit and the fourth series circuit and connected to the first auxiliary capacitor, and wherein the secondary winding and the tertiary winding are separate bodies and the third series circuit and the fourth series circuit are connected in parallel to the second auxiliary capacitor or the tertiary winding is integrated with the secondary winding. ### Claim 11 A power conversion device comprising: a converter including a main switch element, a main rectifying element, an output capacitor, and a primary winding of a coupled inductor; a resonance assist circuit based on a closed-loop circuit including a series circuit having a secondary winding of the coupled inductor, a first rectifying element, and an auxiliary switch element; and a controller configured to determine an ON timing of the main switch element using a voltage of an auxiliary winding of the coupled inductor. ### Claim 12 (depends on 11) The power conversion device according to claim 11, wherein the controller is configured to turn on the main switch element according to a voltage of the auxiliary winding after turning on the auxiliary switch element and then to turn off the main switch element after turning off the auxiliary switch element or simultaneously when turning off the auxiliary switch element. ### Claim 13 (depends on 12) The power conversion device according to claim 12, further comprising a second controller, wherein the second controller is configured to cause the main rectifying element, which is a switch element responsible for a reflux operation of an exciting current of the primary winding, to perform a pair of ON/OFF operations for which a short-circuit prevention period associated with the main switch element is set and to turn off the main rectifying element when a current of the main rectifying element reaches any negative current value after the auxiliary switch element is turned on. ### Claim 14 A power conversion device comprising: a converter including a main switch element, a main rectifying element, an output capacitor, and a primary winding of a coupled inductor; and a resonance assist circuit based on a closed-loop circuit including a series circuit having a secondary winding of the coupled inductor, a first rectifying element, and an auxiliary switch element, wherein the converter is any one of a boost-buck converter, a flyback converter, and a buck converter, and wherein the converter is configured to obtain a constant voltage source from a voltage of the secondary winding via a rectifier diode. ### Claim 15 A power conversion device comprising: a converter including a main switch element, a main rectifying element, an output capacitor, and a primary winding of a coupled inductor, the polarity of a current of the primary winding switching between positive and negative states; a resonance assist circuit based on a first closed-loop circuit including a positive-side secondary winding of the coupled inductor, a first rectifying element, and a first auxiliary switch that is driven when the polarity of a current of the primary winding is positive and a second closed-loop circuit including a negative-side secondary winding of the coupled inductor, a second rectifying element, and a second auxiliary switch that is driven when the polarity of the current of the primary winding is negative; and a controller configured to determine an ON timing of the main switch element using a voltage of an auxiliary winding of the coupled inductor. ### Claim 16 A power conversion device comprising: a converter including a main switch element, a main rectifying element, an output capacitor, and a primary winding of a coupled inductor, the polarity of a current of the primary winding switching between positive and negative states; a resonance assist circuit based on a closed-loop circuit including a secondary winding of the coupled inductor, a first rectifying element connected in parallel to a first auxiliary switch that is driven when the polarity of the current of the primary winding is positive, and a second rectifying element connected in parallel to a second auxiliary switch that is driven when the polarity of the current of the primary winding is negative; and a controller configured to determine an ON timing of the main switch element using a voltage of an auxiliary winding of the coupled inductor. ### Claim 17 (depends on 16) The power conversion device according to claim 16, wherein the controller is configured to cause the main rectifying element, which is a switch element responsible for a reflux operation of an exciting current of the primary winding, to perform a pair of ON/OFF operations for which a short-circuit prevention period associated with the main switch element is set and to turn off the main rectifying element when a current of the main rectifying element reaches any negative current value after any one of the first auxiliary switch and the second auxiliary switch is turned on. ### Claim 18 A power conversion device comprising: a converter including a main switch element, a main rectifying element, an output capacitor, and a primary winding of a coupled inductor, the polarity of a current of the primary winding switching between positive and negative states; and a resonance assist circuit based on a first closed-loop circuit including a secondary winding of the coupled inductor, a first rectifying element, and a first auxiliary switch that is driven when the polarity of the current of the primary winding is positive and a second closed-loop circuit including a secondary winding of the coupled inductor, a second rectifying element, and a second auxiliary switch that is driven when the polarity of the current of the primary winding is negative. ### Claim 19 (depends on 18) The power conversion device according to claim 18, wherein the power conversion device is applied to a totem-pole power factor correction (PFC) circuit, wherein a positive-side alternating current (AC) diode of the totem-pole PFC circuit associated with a series circuit based on the secondary winding, the first rectifying element, and the first auxiliary switch is connected, and wherein a negative-side AC diode of the totem-pole PFC circuit associated with a series circuit based on the secondary winding, the second rectifying element, and the second auxiliary switch is connected. ### Claim 20 A power conversion device including a converter including a main switch element, a main rectifying element, an output capacitor, and a primary winding of a coupled inductor and a resonance assist circuit based on a closed-loop circuit including a series circuit having a secondary winding of the coupled inductor, a first rectifying element, and an auxiliary switch element, the power conversion device comprising: two boost circuits including the main switch element and the main rectifying element applied to a dual-boost PFC circuit connected to a single-phase AC input, wherein the resonance assist circuit corresponds to the two boost circuits, and wherein the auxiliary switch element is shared in the resonance assist circuit. ### Claim 21 (depends on 20) The power conversion device according to claim 20, comprising a controller configured to determine an ON timing of the main switch element using a voltage of an auxiliary winding of the coupled inductor.