Electromagnetic wave suppression circuit of power supply

A technology of power supply and suppression circuit, applied in the direction of electrical components, output power conversion devices, etc.

Inactive Publication Date: 2013-05-08
亚荣源科技(深圳)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although this circuit connection method has a simple structure and is easy to set the driving curve of the power transistor Q1, it has the disadvantage that once the driving curve is set, it cannot be changed at will

Method used

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  • Electromagnetic wave suppression circuit of power supply
  • Electromagnetic wave suppression circuit of power supply
  • Electromagnetic wave suppression circuit of power supply

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Embodiment Construction

[0034] The present invention is to realize a circuit that can effectively improve the electromagnetic wave characteristics under heavy load or overload through circuit design.

[0035] Such as figure 2 Shown is a specific embodiment of the electromagnetic wave suppression circuit of the power supply of the present invention. The electromagnetic wave suppressing circuit includes a rectifying device 212 , a transformer T1 , an output circuit 204 , a first switching device Q1 , a feedback circuit 206 , and a control unit 22 . Wherein the rectifying device 212 is used to rectify the input AC power to a DC power; the transformer T1 is used to transmit the DC power rectified by the rectifying device 212 from the primary side winding of the transformer T1 to the secondary side winding, Then output to the load device via the output circuit 204; the first switching device Q1 can be a power transistor, one end is connected to the primary winding of the transformer T1, and the other en...

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Abstract

The invention discloses an electromagnetic wave suppression circuit of a power supply. The electromagnetic wave suppression circuit comprises a rectifying device, a transformer, an output circuit, a first switching device, a control unit used for controlling trigger voltage levels of the first switching device, and a feedback circuit. The control unit comprises a pulse width modulation control device, a voltage level monitoring device and a power transistor charging and discharging curve control device.

Description

[0001] The invention relates to a power supply device, especially a power supply device with a frequency conversion device. Background technique [0002] Most current switching power supplies use pulse width modulation (Pulse Width Modulation, PWM) to control power transistors as switches. like figure 1 As shown, the most commonly used method is to directly connect two resistors Rg1 and Rg2 in series on the driving pin of the PWM control IC, and connect a diode in parallel to the single resistor, and then connect it to the power transistor Q1 to be driven. [0003] Although this circuit connection method has a simple structure and is easy to set the driving curve of the power transistor Q1, it has the disadvantage that once the driving curve is set, it cannot be changed arbitrarily. If the voltage or current of the switching power supply system changes rapidly, it will easily cause a lot of noise and form electromagnetic radiation interference. Therefore, if the situation o...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H02M1/44
Inventor庄乙雄
Owner亚荣源科技(深圳)有限公司