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Capacitance decompression AC-DC switch power source

A capacitor step-down, switching power supply technology, applied in the conversion equipment without intermediate conversion to AC, the irreversible AC power input is converted into DC power output and other directions, which can solve the problem of large waveform distortion at the AC power supply end.

Inactive Publication Date: 2008-03-12
ZHEJIANG YUANCHUANG ELECTRONICS TECH
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  • Abstract
  • Description
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Problems solved by technology

This circuit is only suitable for half-wave rectification circuits, the waveform distortion of the AC power supply is relatively large, and the DC output terminal is not isolated from the AC input terminal.

Method used

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  • Capacitance decompression AC-DC switch power source

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Embodiment Construction

[0008] As shown in Figure 1, this capacitive step-down AC-DC switching power supply includes a first rectifier diode D1, a second rectifier diode D2, a third rectifier diode D3, a fourth rectifier diode D4, a first voltage dividing capacitor C1, a second The voltage dividing capacitor C2, the third voltage dividing capacitor C3, the fourth voltage dividing capacitor C4, the first voltage regulating switch tube Q4, the second voltage regulating switch tube Q3, the output diode D9, the output capacitor C5, the inductor L1 and the controller 1 . The parameters of the first voltage dividing capacitor, the second voltage dividing capacitor, the third voltage dividing capacitor and the fourth voltage dividing capacitor are all the same, and the four voltage dividing capacitors are divided into two groups, the first voltage dividing capacitor and the second voltage dividing capacitor are one group, the third voltage dividing capacitor and the fourth voltage dividing capacitor are anot...

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Abstract

The utility model relates to a capacitor depressurizing AC-DC switch power supply, comprising four rectifying diodes(D1, D2, D3 and D4), a first voltage distributing capacitor(C1), a second voltage distributing capacitor(C2), a third voltage distributing capacitor(C3), a fourth voltage distributing capacitor(C4), a controller(1), a first isolated diode(D6), a second isolated diode(D8), a first grounding diode(D5), a second grounding diode(D7), a first discharging switch tube(Q1) and a second discharging switch tube(Q2). The four voltage distributing capacitors are divided into two units, and each unit enters into the negative half circle after being charged in the positive half circle and each unit is controlled through the controller and is connected with the grounding diode and the discharging switch tube. The two units are connected in parallel with each other to discharge on load, so that the power on each voltage distributing capacitor can be fully used and the power supply can supply relative large DC output current. Besides, the utility model also has the function of on-line natural isolation.

Description

technical field [0001] The invention relates to a structure of a power supply for converting alternating current into direct current, and a capacitance step-down AC-DC switching power supply. Background technique [0002] In the step-down switching power supply, the inductance energy storage step-down is often used to transfer energy, and the step-down is determined by the turns ratio and pulse width of the switching transformer. Chinese patent 200620014628.8 introduces a resistor-capacitor step-down power supply circuit, which includes a half-wave rectifier circuit, a first energy storage capacitor, a second energy storage capacitor and a three-terminal device for controlling the charging circuit. Continue to supply power to the DC power supply for half a week, and can obtain twice the power supply capacity of the conventional resistor-capacitor step-down power supply. This kind of circuit is only suitable for half-wave rectification circuits, the waveform distortion of th...

Claims

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Application Information

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IPC IPC(8): H02M7/06H02M3/06H02M3/07
Inventor 葛铮
Owner ZHEJIANG YUANCHUANG ELECTRONICS TECH
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