# US 6,297,973 B1 · Power converter for correcting power factor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 6,297,973 B1 - Document ID: US6297973B1 - Status: Granted - Kind: B1 - Application number: 09/808,199 - Filed: 2001-03-13 - Granted: 2001-10-02 - Earliest claimed: 2000-11-30 - Assignees: Delta Electronics, Inc. - Inventors: Ying Jian-Ping; Lu Bing; Zeng Jian-Hong - Web page: https://patentgrep.com/patent/US6297973B1 ## CPC - H02M 7/523: with LC-resonance circuit in the main circuit - H02M 5/44: using discharge tubes or semiconductor devices to convert the intermediate DC into AC - 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) ## Abstract A power converter for converting electrical power is provided. The power converter includes a first converting circuit. The first converting circuit has a switch assembly alternatively turning on and off for converting a direct current (DC) to a first alternating current (AC), a transformer coupled to the switch assembly for transforming the first alternating current to a second alternating current, a major switch coupled in parallel with the switch assembly and a first switch device, a boosting switch coupled in parallel with the switch assembly and a second switch device, and a first capacitor coupled in series with the boosting switch. ## Claims ### Claim 1 A power converter, comprising: a first converting circuit, said first converting circuit having switch assembly alternatively turning on and off for converting a direct current (DC) to a first alternating current (AC); a transformer coupled to said switch assembly for transforming said first alternating current to a second alternating current; a major switch coupled in parallel with said switch assembly, and a first switch device couple in parallel with said major switch; and a series-couple boosting switch and a first capacitor coupled in parallel with said switch assembly, said boosting switch coupled in parallel with a second switch device. ### Claim 2 (depends on 1) The power converter according to claim 1, wherein said first converting circuit further comprising a current-limiting inductor coupled in series between said transformer and said switch assembly. ### Claim 3 (depends on 1) The power converter according to claim 1, wherein said first capacitor is a wave-filtering capacitor. ### Claim 4 (depends on 1) The power converter according to claim 1, wherein said major switch is further coupled in parallel with a second capacitor and said boosting switch is further coupled in parallel with a third capacitor. ### Claim 5 (depends on 4) The power converter according to claim 4, wherein said second capacitor and said third capacitor are respectively the internal capacitors of said major switch and said boosting switch. ### Claim 6 (depends on 4) The power converter according to claim 4, wherein each of said second capacitor and said third capacitor is one of adjustable capacitor and constant capacitor. ### Claim 7 (depends on 1) The power converter according to claim 1, further comprising a second converting circuit having a structure the same as that of said first converting circuit and coupled in parallel with said first converting circuit. ### Claim 8 (depends on 1) The power converter according to claim 1, wherein said first converting circuit further comprises a first rectifying circuit coupled in parallel with said switch assembly and said major switch. ### Claim 9 (depends on 8) The power converter according to claim 8, wherein said first rectifying circuit is one of a single-phase rectifying circuit and three-phase rectifying circuit. ### Claim 10 (depends on 8) The power converter according to claim 8, further comprising a third converting circuit having a structure the same as that of said first converting circuit and coupled in parallel with said first converting circuit. ### Claim 11 (depends on 1) The power converter according to claim 1, wherein said first converting circuit further comprises a second rectifying circuit coupled to said transformer and a LC wave-filter coupled to said second rectifying circuit. ### Claim 12 (depends on 11) The power converter according to claim 11, wherein said second rectifying circuit is one of a single-phase rectifying circuit and three-phase rectifying circuit. ### Claim 13 (depends on 11) The power converter according to claim 11, further comprising a fourth converting circuit having a structure the same as that of said first converting circuit and coupled in parallel with said first converting circuit. ### Claim 14 (depends on 1) The power converter according to claim 1, wherein said switch assembly is one of a full-bridge switch assembly and half-bridge switch assembly. ### Claim 15 (depends on 1) The power converter according to claim 1, wherein said switch assembly is one of uni-polar and bipolar transistors. ### Claim 16 (depends on 1) The power converter according to claim 1, wherein said first alternative current is a high frequency alternative current. ### Claim 17 (depends on 1) The power converter according to claim 1, wherein said first switch device is a first diode reversely coupled in parallel with said major switch. ### Claim 18 (depends on 17) The power converter according to claim 17, wherein said second switch device is a second diode reversely coupled in parallel with said boosting switch. ### Claim 19 (depends on 18) The power converter according to claim 18, wherein said first diode and said second diode are respectively the internal diodes of said major switch and said booting switch. ### Claim 20 A power converter, comprising: a first converting circuit, said first converting circuit having a switch assembly alternatively turning on and off for converting a direct current (DC) to a first alternating current (AC); a transformer coupled to said switch assembly for transforming said first alternating current to a second alternating current; a major switch coupled in parallel with said switch assembly and a first switch device; and a series-couple boosting switch and a first capacitor coupled in parallel with said switch assembly and said boosting switch couple in parallel with a second switch device; a current-limiting inductor coupled in series between said transformer and said switch assembly. ### Claim 21 (depends on 20) The power converter according to claim 20, wherein said major switch is further coupled in parallel with a second capacitor and said boosting switch is further coupled in parallel with a third capacitor. ### Claim 22 (depends on 20) The power converter according to claim 20, further comprising a second converting circuit having a structure the same as that of said first converting circuit and coupled in parallel with said first converting circuit. ### Claim 23 (depends on 20) The power converter according to claim 20, wherein said first converting circuit further comprises a first rectifying circuit coupled in parallel with said switch assembly and said major switch. ### Claim 24 (depends on 23) The power converter according to claim 23, further comprising a third converting circuit having a structure the same as that of said first converting circuit and coupled in parallel with said first converting circuit. ### Claim 25 (depends on 20) The power converter according to claim 20, wherein said first converting circuit further comprises a second rectifying circuit coupled to said transformer and a LC wave-filter coupled to said second rectifying circuit. ### Claim 26 (depends on 25) The power converter according to claim 25, further comprising a fourth converting circuit having a structure the same as that of said first converting circuit and coupled in parallel with said first converting circuit. ### Claim 27 (depends on 20) The power converter according to claim 20, wherein said switch assembly is one of a full-bridge switch assembly and half-bridge switch assembly. ### Claim 28 (depends on 20) The power converter according to claim 20, wherein said first switch device is a first diode reversely coupled in parallel with said major switch. ### Claim 29 (depends on 28) The power converter according to claim 28, wherein said second switch device is a second diode reversely coupled in parallel with said boosting switch. ### Claim 30 A power converter, comprising: a first converting circuit, said first converting circuit having a switch assembly alternatively turning on and off for converting a direct current (DC) to a first alternating current (AC); a transformer coupled to said switch assembly for transforming said first alternating current to a second alternating current; a major switch coupled in parallel with said switch assembly, and a first switch device couple in parallel with said major switch; a series-couple boosting switch and a first capacitor coupled in parallel with said switch assembly, said boosting switch couple in parallel with a second switch device; a first rectifying circuit coupled in parallel with said switch assembly and said major switch; a second rectifying circuit coupled to said transformer; and a LC wave-filter coupled to said second rectifying circuit. ### Claim 31 (depends on 30) The power converter according to claim 30, further comprising a second converting circuit having a structure the same as that of said first converting circuit and coupled in parallel with said first converting circuit. ### Claim 32 (depends on 30) The power converter according to claim 30, wherein said first converting circuit further comprises a current-limiting inductor coupled in series between said transformer and said switch assembly. ### Claim 33 (depends on 32) The power converter according to claim 32, further comprising a third converting circuit having a structure the same as that of said first converting circuit and coupled in parallel with said first converting circuit.