# US 2014/0153305 A1 · Ac/dc converter with passive power factor correction circuit and method of 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 2014/0153305 A1 - Document ID: US20140153305A1 - Status: Published application - Kind: A1 - Application number: 14/096,749 - Filed: 2013-12-04 - Published: 2014-06-05 - Earliest claimed: 2012-12-05 - Assignees: Hep Tech Co., Ltd. - Applicants: Hep Tech Co., Ltd. - Inventors: Ching-Tsai PAN; Po-Yen CHEN; Ta-Sheng HUNG - Web page: https://patentgrep.com/patent/US20140153305A1 ## CPC - H02M 1/4266: {using passive elements} - 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 - Y02P 80/10: Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier - 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 - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS ## Abstract An AC/DC converter includes a rectifier circuit and a power factor correction circuit. An input port of the rectifier circuit receives an alternate current. The power factor correction circuit includes a first inductor, a second inductor, a first capacitor, a second capacitor, a first diode and a second diode. An end of the first inductor electrically connects to a positive pole of an output port of the rectifier circuit, and the other end electrically connects to a ground terminal of the output port through two parallel series routes which are bridged by the first diode. Wherein a series route contains the first capacitor and the second diode, and the other series route contains the second inductor and the second capacitor. The second capacitor is provided for parallel connecting with a loading. In this way, the input current could be controlled to increase the power factor effectively. ## Claims ### Claim 1 An AC/DC converter, comprising: a rectifier circuit, which converts an alternate current (AC) into a direct current (DC), having an input port and an output port, wherein the input port receives the AC, and the DC comes out via the output port; and a power factor correction circuit comprising a first inductor, a second inductor, a first capacitor, a second capacitor, a first diode and a second diode; wherein an end of the first inductor is electrically connected to a positive pole of the output port of the rectifier circuit, and the other end thereof is electrically connected to two series routes which are in parallel to each other, wherein the first capacitor and the second diode are on one of the series route; an end of the first capacitor is electrically connected to the first inductor, and the other end thereof is electrically connected to a cathode of the second diode, and an anode of the second diode is electrically connected to a ground terminal of the output port of the rectifier circuit; the second inductor and the second capacitor are on the other series route; an end of the second inductor is electrically connected to the first inductor, and the other end thereof is electrically connected to an end of the second capacitor, the other end of the second capacitor is electrically connected to the ground terminal of the output port of the rectifier circuit; the second capacitor is connected to a loading in parallel; an anode of the first diode is electrically connected to a point between the first capacitor and the cathode of the second diode, and a cathode of the first diode is electrically connected to a point between the second inductor and the second capacitor. ### Claim 2 (depends on 1) The AC/DC converter of claim 1, wherein the inductance of the second inductor is no less than ten times of the inductance of the first inductor. ### Claim 3 (depends on 1) The AC/DC converter of claim 1, wherein the second capacitor is a capacitor other than an electrolytic capacitor. ### Claim 4 A method of correcting power factor with a power factor correction circuit, wherein the power factor correction circuit comprises a first inductor, a second inductor, a first capacitor, a second capacitor, a first diode and a second diode, wherein an end of the first inductor is electrically connected to a positive pole of a DC power supply, and the other end thereof is electrically connected to two series routes which are in parallel to each other, wherein the first capacitor and the second diode are on one of the series route; an end of the first capacitor is electrically connected to the first inductor, and the other end thereof is electrically connected to a cathode of the second diode, and an anode of the second diode is electrically connected to a ground terminal of the DC power supply; the second inductor and the second capacitor are on the other series route; an end of the second inductor is electrically connected to the first inductor, and the other end thereof is electrically connected to an end of the second capacitor, the other end of the second capacitor is electrically connected to the ground terminal of the DC power supply; the second capacitor is connected to a loading in parallel; an anode of the first diode is electrically connected to a point of the series route between the first capacitor and the cathode of the second diode, and a cathode of the first diode is electrically connected to a point of the series route between the second inductor and the second capacitor; the method comprising the steps of: A. receiving a direct current (DC) from the DC power supply; B. conducting the second diode, and providing energy into the loading from the first capacitor and the DC power supply until the second diode is cut off; C. providing energy into the loading from the DC power supply until the first diode is conducted; D. charging the first capacitor by the DC power supply, and providing energy into the loading until the first diode is cut off; E. providing energy into the loading from the DC power supply until the second diode is conducted; and F. repeating the steps from the step B to the step E until the DC power supply stops providing the DC. ### Claim 5 (depends on 4) The method of claim 4, wherein the second diode is conducted when a voltage of the first capacitor is higher than a total voltage of the first inductor and the second capacitor, and the second diode is cut off until the voltage of the first capacity is lower than the total voltage the of first inductor and the second capacitor in the step B. ### Claim 6 (depends on 4) The method of claim 4, wherein the first diode is conducted when a voltage of the DC is higher than a total voltage of the first inductor, the first capacitor, and the second capacitor. ### Claim 7 (depends on 4) The method of claim 4, wherein the first diode is cut off when a voltage of the DC is lower than a total voltage of the first inductor, the first capacitor, and the second capacitor. ### Claim 8 (depends on 4) The method of claim 4, wherein the second diode is conducted when a voltage of the first capacitor is higher than a total voltage of the first inductor and the second capacitor in the step E.