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High-voltage-resistant switching power supply

A switching power supply, high-voltage technology, applied in electrical components, adjusting electrical variables, output power conversion devices, etc., can solve the problem of withstand voltage problems such as input voltage equalization, achieve loss dispersion, facilitate thermal design, and overcome input equalization. Effects of pressure problems

Inactive Publication Date: 2014-12-17
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a high-voltage switching power supply module to overcome the problems of withstand voltage and input voltage equalization in the prior art.

Method used

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  • High-voltage-resistant switching power supply

Examples

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Effect test

Embodiment 1

[0025] The specific topology of the main circuit of the forward conversion circuit is as follows: figure 1 shown.

[0026] The conversion circuit 3 includes a first converter 31, a second converter 32, a sampling resistor R3 and a transformer T1. Wherein, the first converter 31 includes: the first primary winding N1 of the transformer T1, the first power MOSFETQ1, the first fast recovery diode D1, and the first Zener diode Z1; the anode of the first Zener diode Z1 is connected to the first primary winding of the transformer T1 The same-name end of the winding N1 is connected, and the cathode is connected to the cathode of the first fast recovery diode D1; the anode of the first fast recovery diode D1 is connected to the opposite-name end of the first primary winding N1 of the transformer T1, and the cathode is connected to the first Zener diode Z1 The cathode is connected; the drain of the first power MOSFETQ1 is connected to the opposite end of the first primary winding N1 o...

Embodiment 2

[0030] The specific topology of the main circuit of the flyback conversion circuit is as follows: figure 2 shown.

[0031] Such as figure 2 As shown, the connection mode of the equalizing circuit 2 and the conversion circuit 3 in the main circuit topology of the flyback conversion circuit is the same as that of the main circuit topology of the forward conversion circuit.

[0032] The rectification output circuit 4 includes: a rectification diode D3, an energy storage filter capacitor C3, a load resistance RL2, an output positive UO+, and an output negative UO-; the anode of the rectification diode D3 is connected to the opposite end of the first secondary winding N3 of the transformer T1, The cathode is connected to the output positive UO+; the anode of the energy storage filter capacitor C3 is connected to the output positive UO+, and the cathode is connected to the output negative UO-; one end of the load resistor RL2 is connected to the output positive UO+, and the other...

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PUM

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Abstract

The invention relates to a high-voltage-resistant switching power supply which comprises a power module input end, a voltage sharing circuit, a conversion circuit and a rectification output circuit. As shown in an embodiment, the conversion circuit comprises a transformer, a first converter 31 and a second converter 32, and the first converter 31 and the second converter 32 are serially connected with each other; two primary windings N1 and two primary windings N2 are respectively connected into the first converter 31 and the second converter 32, and power devices in the first converter 31 and the second converter 32 synchronously act; the primary winding N1 and the primary winding N2 of each converter have identical numbers of turns, and magnetic flux of the two primary windings of each converter varies consistently when a power module works normally; an input voltage of each single converter is a half of an input voltage, so that problems in the aspect of voltage sharing and the problem of voltage constraints of power devices in the prior art can be solved. The high-voltage-resistant switching power supply has the advantages that an input voltage range of the high-voltage-resistant switching power supply can be changed only by means of simple configuration, and the high-voltage-resistant switching power supply is simple in structure, low in cost and high in universality.

Description

technical field [0001] The invention relates to a switching power supply with high voltage resistance. Background technique [0002] For the global market, there are many grid systems: such as 220V / 380V systems in Europe and China, 208V in North America, and 480 and 600V. The current power supply modules in the market are usually limited to 220VAC input voltage, and some are also compatible with 110VAC. For 600C input, considering the 10% fluctuation of the power grid, the rectified voltage exceeds 900V. At present, the power supply voltage of subway and urban rail has also been increased from 600VDC and 750VDC in the early stage to 1500VDC. [0003] At such a high voltage, the selection of power devices is very difficult: there are fewer optional products for high-voltage power MOSFETs, large on-resistance, and large conduction losses, which will reduce the efficiency of the converter; Under the conditions, there is still a small saturated conduction voltage drop, so the...

Claims

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Application Information

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IPC IPC(8): H02M3/28H02M3/335
Inventor 赵瑞杰代兴华刘德林田素立王艳领李红刚朱洪浩
Owner STATE GRID CORP OF CHINA