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Bridgeless PFC switching power supply circuit

A technology of switching power supply circuit and switching tube, applied in the field of power electronics, can solve the problems of difficulty in current sampling of bridgeless PFC circuit, cannot be directly applied to PFC controller, etc., and achieves simple current sampling signal processing, simple structure, and sampling current signal processing. simple effect

Inactive Publication Date: 2020-06-05
MORNSUN GUANGZHOU SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to, in view of the above-mentioned defects, propose a bridgeless PFC switching power supply circuit, to solve the difficult problem of bridgeless PFC circuit positive and negative half cycle current sampling, can not be directly applicable to the PFC controller of average current mode control

Method used

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  • Bridgeless PFC switching power supply circuit
  • Bridgeless PFC switching power supply circuit
  • Bridgeless PFC switching power supply circuit

Examples

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no. 1 example

[0048] The circuit principle diagram of the bridgeless PFC switching power supply circuit of the first embodiment of the present invention is as follows Image 6 As shown, it is a bridgeless PFC switching power supply circuit and control method based on the current blocking of the switching tube, including: an AC input source AC, a first inductance L1 and a second inductance L2, and the first end of the first inductance L1 is connected to The first end of the AC input source AC, the first end of the second inductor L2 is connected to the second end of the AC input source AC;

[0049] Including: a first diode D1 and a second diode D2, a first switching tube Q1 and a second switching tube Q2, the second end of the first inductor L1 is connected to the anode of the first diode D1 and the first switching tube The drain of Q1, the second end of the second inductor L2 is connected to the anode of the second diode D2 and the drain of the second switching transistor Q2;

[0050] It i...

no. 2 example

[0069] In the above-mentioned first embodiment of the present invention, the bridgeless PFC switching power supply circuit uses the switching tube as the current blocking device. The second embodiment of the present invention is such as Figure 15 As shown, the difference from the first embodiment is that a diode is used as the current blocker.

[0070] A bridgeless PFC switching power supply circuit, comprising: an AC input source AC, a first inductance L1 and a second inductance L2, the first end of the first inductance L1 is connected to the first end of the AC input source AC, and the first end of the second inductance L2 Connect one end to the second end of the AC input source AC;

[0071] Including: a first diode D1 and a second diode D2, a first switching tube Q1 and a second switching tube Q2, the second end of the first inductor L1 is connected to the anode of the first diode D1 and the first switching tube The drain of Q1, the second end of the second inductor L2 i...

no. 3 example

[0080] The circuit principle diagram of the bridgeless PFC switching power supply circuit of the third embodiment of the present invention is as follows Figure 16As shown, the diode is used as the current blocker as in the second embodiment, and the only difference from the second embodiment is that the positions of the switch tube and the current blocker are interchanged. A bridgeless PFC switching power supply circuit, comprising: an AC input source AC, a first inductance L1 and a second inductance L2, the first end of the first inductance L1 is connected to the first end of the AC input source AC, and the first end of the second inductance L2 One end is connected to the second end of the AC input source AC; including: the first diode D1 and the second diode D2, the third diode D3 and the fourth diode D4, the second end of the first inductor L1 The anode of the first diode D1 is connected to the anode of the third diode D3, and the second end of the second inductance L2 is ...

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Abstract

The invention discloses a bridgeless PFC switching power supply circuit. The circuit comprises an AC input source AC, a first inductor L1 and a second inductor L2, a first diode D1 and a second diodeD2, the invention discloses a bridgeless PFC (Power Factor Correction) loop control circuit, which comprises a first switch tube Q1, a second switch tube Q2, a first current interrupter 10, a second current interrupter 20, an output capacitor Co, a first current sampling resistor Rcs, a first fly-wheel diode DB1, a second fly-wheel diode DB2, a current interrupter driving circuit part 30 and a bridgeless PFC loop control part 40. According to the scheme, a current blocker perfectly solves the problem of current shunting of the double-BOOST bridgeless PFC topological inductor, so that all PFC controllers controlled in an average current mode are suitable for the circuit, and the beneficial effects of simple structure, low cost and simple signal processing are achieved.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a double BOOST bridgeless PFC switching power supply circuit. Background technique [0002] PFC (Power Factor Correctiong, power factor correction) refers to the relationship between effective power and total power consumption (apparent power), that is, the ratio of effective power divided by total power consumption (apparent power). The power factor can directly measure the degree to which electricity is effectively utilized. When the power factor value is larger, it means that the power utilization rate is higher. [0003] The bridgeless PFC structure reduces the rectifier bridge, which makes the system loss significantly reduced, and has attracted widespread attention because of its significant advantages in efficiency. The basic bridgeless PFC circuit topology has the difficulty of identifying the current direction in the positive and negative half cycl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/217H02M1/42
CPCH02M1/4225H02M7/217H02M1/0048Y02B70/10
Inventor 龙宪良李健
Owner MORNSUN GUANGZHOU SCI & TECH
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