Secure and efficient low-energy consumption switch power circuit

A switching power supply circuit and power switch technology, which is applied in the direction of high-efficiency power electronic conversion, electrical components, and conversion of AC power input to DC power output, can solve problems such as output voltage drop, improve conversion efficiency, improve voltage adaptability, The effect of improving reliability

Inactive Publication Date: 2008-08-13
王志展 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional circuit can keep the voltage at the output voltage sampling terminal constant within the rated load range, but after the wire is a

Method used

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  • Secure and efficient low-energy consumption switch power circuit
  • Secure and efficient low-energy consumption switch power circuit
  • Secure and efficient low-energy consumption switch power circuit

Examples

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Embodiment Construction

[0021] Hereby, with regard to the structural composition of this case, and the effects and advantages that can be produced, in conjunction with the drawings, the preferred embodiment of this case is given to describe the operation mode of the method of the present invention in detail as follows.

[0022] The power switch unit in the present invention is a triode, such as a CMOS transistor or a BJT transistor (bipolar junction transistor). Using a gate to control the switch of the circuit, when the voltage of the gate reaches a certain level, the power switch will be activated, and then the maximum current flowing through the power switch through the primary side coil of the transformer is inversely related to the input voltage. .

[0023] Hereinafter, the low-power switching power supply circuit of the present invention is described as follows, and please refer to the structural block diagram of FIG. 1 .

[0024] A first rectification and filter circuit RF1 is used to rectify...

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PUM

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Abstract

The invention relates to a safe high efficient low power consumption switch power supply circuit, comprising a control circuit for controlling frequency of control switch power supply, comprising a first power switch unit located between an output end and a grounding end of a clamper; a starting control circuit for actuating the first power switch unit when starting; a second switch unit located between the first power switch unit and connecting point and grounding end of the starting control circuit. A gate of the second switch unit has four current sources as actuating current sources, a light load pulse width controller for regulating output pulse width and oscillation frequency; a third power switch unit connected between the output end of the first power switch unit and the output end of the optical coupler saves energy and reduces consumption, which saves output current-limiting circuit in traditional circuit, improves conversion efficiency of the circuit, voltage adaptability of the product and reliability of the product enabling greater safety of the product.

Description

technical field [0001] The present invention relates to a power supply circuit, in particular to a safe, high-efficiency, low-power switching power supply circuit and technology, including an energy-saving control circuit using a high-resistance starting resistor, light-load oscillation frequency control and minimum pulse width control, Main loop current limiting circuit controlled by input voltage, output voltage abnormality protection controlled by primary side, output constant voltage circuit with line loss voltage compensation. Background technique [0002] The traditional switching power supply circuit mainly includes: a first rectification and filter circuit, which is used to rectify the input voltage and filter out the AC component, and the rectification and filter circuit is connected to the primary side coil of the transformer. A transformer includes the primary coil, a secondary coil and a feedback coil are coupled to the primary coil. A clamper is used to absorb ...

Claims

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Application Information

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IPC IPC(8): H02M5/40H02M7/527H02M1/32
CPCH02M1/36H02M3/33507H02M1/0032Y02B70/10
Inventor 王志展胡文和李花珍
Owner 王志展
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