CN-224233546-U - AC/DC input power supply circuit and switching power supply

Abstract

The utility model discloses an alternating current-direct current input power supply circuit and a switching power supply, wherein the alternating current-direct current input power supply circuit comprises a controllable rectifying circuit, a BUCK buffer circuit, a BOOST power factor correction circuit, a first input end, a second input end, a first output end and a second output end, the controllable rectifying circuit comprises a diode D2, a diode D3, a controllable switch V1 and a controllable switch V2, the BOOST power factor correction circuit comprises an inductor L1, a MOS (metal oxide semiconductor) tube S2, a diode D6 and an output capacitor C1, and the BUCK buffer circuit comprises a diode D1, a MOS tube S1, the diode D2, the diode D3 and the inductor L1. The controllable rectifying circuit and the BUCK buffer circuit multiplexing diodes D2 and D3, the BUCK buffer circuit multiplexing inductance L1 and the BOOST power factor correction circuit multiplexing inductance L1 are compatible with AC/DC input, so that the startup surge current is effectively restrained, the steady-state power factor correction is realized, the high multiplexing of the power devices is realized, the circuit volume is reduced, the device cost is optimized, and the overall loss is reduced.

Inventors

• YANG CHUN
• LI HONGJUN

Assignees

• 广州金升阳科技有限公司

Dates

Publication Date

20260512

Application Date

20250328

Claims (6)

1. 1. The alternating current-direct current input power supply circuit is characterized by comprising a controllable rectifying circuit, a BUCK buffer circuit, a BOOST power factor correction circuit, a first input end, a second input end, a first output end and a second output end, wherein the controllable rectifying circuit comprises a diode D2, a diode D3, a controllable switch V1 and a controllable switch V2, the BOOST power factor correction circuit comprises an inductor L1, a MOS (metal oxide semiconductor) tube S2, a diode D6 and an output capacitor C1, the BUCK buffer circuit comprises a diode D1, a MOS tube S1, the diode D2, the diode D3 and the inductor L1, an anode of the diode D2 and a cathode of the diode D3 are connected together to serve as the first input end, one end of the diode D1 and one end of the controllable switch V2 are connected together to serve as the second input end, a cathode of the diode D1 and a cathode of the MOS tube S2 are connected with the drain electrode S2, one end of the diode D2 and one end of the other end of the diode C1 and the other end of the diode S2 are connected with the cathode of the diode C1 and the other end of the diode C2 and the other end of the diode C1 and the cathode of the diode S2 are connected to serve as the second input end.
2. 2. The AC/DC input power supply circuit as set forth in claim 1, wherein said second input terminal is said positive input terminal and said first input terminal is said negative input terminal when said AC/DC input power supply circuit is a DC input.
3. 3. The AC/DC input power supply circuit as set forth in claim 1, wherein said controllable switch V1 is a first silicon controlled rectifier, one end of said controllable switch V1 is an anode of said first silicon controlled rectifier, the other end of said controllable switch V1 is a cathode of said first silicon controlled rectifier, said controllable switch V2 is a second silicon controlled rectifier, one end of said controllable switch V2 is a cathode of said second silicon controlled rectifier, and the other end of said controllable switch V2 is an anode of said second silicon controlled rectifier.
4. 4. The AC/DC input power supply circuit as set forth in claim 1, further comprising a controllable switch V3, wherein one end of the controllable switch V3 is connected to a connection point between the cathode of the diode D2 and the source of the MOS transistor S1, and the other end of the controllable switch V3 is connected to a connection point between the anode of the output capacitor C1 and the cathode of the diode D6.
5. 5. The AC/DC input power supply circuit as claimed in claim 4, wherein said controllable switch V3 is a third thyristor, one end of said controllable switch V3 is an anode of said third thyristor, and the other end of said controllable switch V3 is a cathode of said third thyristor.
6. 6. A switching power supply is characterized by comprising the AC/DC input power supply circuit as claimed in any one of claims 1 to 5.

Description

AC/DC input power supply circuit and switching power supply Technical Field The utility model belongs to the technical field of power electronics, and particularly relates to an alternating current-direct current input power supply circuit and a switching power supply. Background In the switching power supply for AC and DC input, the functions of compatible AC and DC rectification, starting surge current suppression and power factor correction are usually required to be simultaneously satisfied, and the conventional technical scheme is to respectively adopt a common rectifier bridge circuit, a power resistor, a switch parallel circuit and a power factor correction circuit to realize the functions. Disclosure of utility model Therefore, the technical problem to be solved by the utility model is to provide an AC/DC input power supply circuit and a switching power supply, which realize compatible AC/DC rectification, starting surge current suppression and power factor correction functions through high multiplexing of devices, and simultaneously can reduce the circuit volume, optimize the device cost and reduce the circuit loss. As a first aspect of the present utility model, an embodiment of an ac/dc input power supply circuit is provided as follows: The alternating current-direct current input power supply circuit comprises a controllable rectifying circuit, a BUCK buffer circuit, a BOOST power factor correction circuit, a first input end, a second input end, a first output end and a second output end, wherein the controllable rectifying circuit comprises a diode D2, a diode D3, a controllable switch V1 and a controllable switch V2, the BOOST power factor correction circuit comprises an inductor L1, a MOS (metal oxide semiconductor) tube S2, a diode D6 and an output capacitor C1, the BUCK buffer circuit comprises a diode D1, a MOS (metal oxide semiconductor) tube S1, the diode D2, the diode D3 and the inductor L1, the anode of the diode D2 and the cathode of the diode D3 are connected together to serve as the first input end, one end of the diode D1 and one end of the controllable switch V2 are connected together to serve as the second input end, the cathode of the diode D1 and the drain electrode S1 are connected with the drain electrode of the MOS tube S6, the diode D2 and the cathode of the other end of the diode D2 and the other end of the diode D1 are connected to serve as the second input end, and the cathode of the diode D1 and the cathode of the diode D2 and one end of the other end of the controllable switch V2 are connected to serve as the second input end, and the cathode of the MOS 2 and the cathode of the diode C1 and the other end of the diode C2 is connected to serve as the second input end. Further, when the ac/dc input power supply circuit is dc input, the second input end is the positive input end, and the first input end is the negative input end. Preferably, the controllable switch V1 is a first silicon controlled rectifier, one end of the controllable switch V1 is an anode of the first silicon controlled rectifier, the other end of the controllable switch V1 is a cathode of the first silicon controlled rectifier, the controllable switch V2 is a second silicon controlled rectifier, one end of the controllable switch V2 is a cathode of the second silicon controlled rectifier, and the other end of the controllable switch V2 is an anode of the second silicon controlled rectifier. Further, the ac/dc input power supply circuit further includes a controllable switch V3, one end of the controllable switch V3 is connected to a connection point between the cathode of the diode D2 and the source of the MOS transistor S1, and the other end of the controllable switch V3 is connected to a connection point between the anode of the output capacitor C1 and the cathode of the diode D6. Preferably, the controllable switch V3 is a third silicon controlled rectifier, one end of the controllable switch V3 is an anode of the third silicon controlled rectifier, and the other end of the controllable switch V3 is a cathode of the third silicon controlled rectifier. As a second aspect of the present utility model, a technical solution of an embodiment of a switching power supply is provided as follows: A switching power supply comprising an ac/dc input power supply circuit as claimed in any one of the first aspects above. When the input ends of the alternating current-direct current input power supply circuit and the switching power supply are connected with an alternating current power supply and a direct current power supply, the BUCK buffer charging circuit pre-charges the output capacitor C1, the controllable rectifying circuit and the BOOST power factor correction circuit start to work after the pre-charging is finished, the starting process is completed, the steady state is entered, and the controllable rectifying circuit and the BUCK buffer charging multiplexing diodes D2 and D3 and the BUCK buffer charging