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Switching power supply and valley fill circuit

A technology of switching power supply and valley-filling circuit, which is applied in the direction of electrical components, adjusting electric variables, instruments, etc., can solve the problems of uneven voltage of the main power switch tube, improve the PF value, increase the conduction angle, and reduce the system volume effect

Pending Publication Date: 2022-04-12
MORNSUN GUANGZHOU SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention can be mainly used to solve the problem of unbalanced voltage of the main power switching tubes in the operation of the switching power supply using multiple tubes in series for the main power, especially in the transient operation. The purpose of the present invention is achieved by the following technical solutions:

Method used

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  • Switching power supply and valley fill circuit
  • Switching power supply and valley fill circuit
  • Switching power supply and valley fill circuit

Examples

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no. 1 example

[0041] figure 2 It is a schematic diagram of the first embodiment of the switching power supply of the present invention, and the switching power supply includes: a main power circuit and a valley filling circuit.

[0042] The main power circuit has a primary circuit and a secondary circuit (not shown), the primary circuit includes: a first winding L1, a second winding L2, a first switching tube Q1 connected in series with the first winding L1 and a second winding L2 is connected in series with the second switch tube Q2.

[0043] The valley filling circuit has a first energy storage unit C1, a second energy storage unit C2, a diode D1, and a third switch tube Q3. In this embodiment, the first energy storage unit C1 and the second energy storage unit C2 have the same capacitance Hereinafter, the first energy storage unit C1 is referred to as capacitor C1 for short, and the second energy storage unit C2 is referred to as capacitor C2 for short; the first switching tube Q1 , th...

no. 2 example

[0049] image 3 It is a schematic diagram of the second embodiment of the switching power supply of the present invention. Compared with the first embodiment, the difference lies in that the third switching tube Q3 of the valley filling circuit in the switching power supply of this embodiment is controlled on the high side.

[0050] The valley filling circuit has a capacitor C1 (first energy storage unit), a capacitor C2 (second energy storage unit), a diode D1 and a third switch tube Q3. The positive pole of the capacitor C1 (the first energy storage unit) is used to connect to the positive input end of the switching power supply, and the positive pole of the capacitor C1 is connected to the first end of the first winding, and the negative pole of the capacitor C1 is connected to the source stage of the first switching transistor Q1 and the anode of the diode D1, the second end of the first winding L1 is connected to the drain of the first switching tube Q1, and the cathode o...

no. 3 example

[0053] Figure 4 It is a schematic diagram of the third embodiment of the switching power supply of the present invention. Compared with the first embodiment, the difference is that the fourth switching tube Q4 is also provided in the valley filling circuit in the switching power supply of this embodiment.

[0054] The valley filling circuit has a capacitor C1 (first energy storage unit), a capacitor C2 (second energy storage unit), a diode D1 , a third switch Q3 and a fourth switch Q4 .

[0055] The positive pole of the capacitor C1 is used to connect with the positive input terminal of the switching power supply, and the positive pole of the capacitor C1 is respectively connected with the first terminal of the first winding L1 and the drain of the fourth switching tube Q4, and the negative pole of the capacitor C1 is respectively connected with the third switch The drain of the tube Q3, the source of the first switching tube Q1, and the anode of the diode D1; the second end ...

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Abstract

The invention relates to the field of switching power supplies, and discloses a switching power supply and a valley fill circuit wherein the switching power supply comprises a first energy storage unit, a second energy storage unit, a first diode, a second diode, a third diode, a first switch, a second switch, a first winding and a second winding. The switching power supply can be applied to the field of switching power supplies with wide voltage input, when the input voltage is low-voltage input, the first switch and the second switch are controlled to be switched on, and when the input voltage is high-voltage input, the first switch and the second switch are controlled to be switched off. When the energy storage unit is a capacitor, the switching power supply can provide appropriate filtering capacity for input voltages in different ranges, can improve the PF value during high-voltage input, solves the problems of large output voltage fluctuation and impact current of a large capacitor during low-voltage input, and reduces the size of a system and the cost at the same time.

Description

technical field [0001] The invention relates to the field of switching power supplies, in particular to a switching power supply with wide voltage input and a valley-filling circuit. Background technique [0002] In the industrial and civil fields, it is often necessary to rectify the alternating current of various power grids into direct current. In order to make the switching power supply meet the global grid standard, it is necessary to design the input voltage of the switching power supply to meet the requirements of a wide range of input voltage. It increases the difficulty, increases the selection specifications of passive components in the circuit, increases the volume and weight of the circuit, and also brings greater cost pressure. The input part of the switching power supply is usually composed of a bridge rectifier circuit and a filter capacitor. , both of which are nonlinear devices, due to the existence of large-capacity capacitors, the conduction angle of the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/07H02M3/158H02M1/088H02M1/34
Inventor 不公告发明人
Owner MORNSUN GUANGZHOU SCI & TECH
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