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Wide-range, high-reliability, low-EMI flyback switching power supply

A flyback switch with a wide range of technology, applied in the field of frequency shaking technology, can solve the problems of high cost and low electrolytic life, and achieve the effects of ensuring reliable operation, reducing EMI, and improving surge resistance

Inactive Publication Date: 2019-12-13
QINGDAO TOPSCOMM COMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The traditional switching power supply uses high-voltage electrolytic energy storage and filtering after the rectifier bridge. The circuit designed by this invention can remove the high-voltage electrolysis, reduce th

Method used

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  • Wide-range, high-reliability, low-EMI flyback switching power supply
  • Wide-range, high-reliability, low-EMI flyback switching power supply
  • Wide-range, high-reliability, low-EMI flyback switching power supply

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Embodiment Construction

[0016] The present invention will be further illustrated by the following examples in conjunction with the accompanying drawings:

[0017] as attached figure 1 As shown, the wide-range, high-reliability, low-EMI flyback switching power supply circuit includes an enhanced varistor, a capacitor π-type low-frequency filter circuit, an input rectifier circuit, a secondary clamp varistor circuit, and a high-voltage MOS divider circuit connected in sequence. Voltage protection circuit, switch conversion and secondary rectification circuit, frequency shaking technology high-frequency filter circuit, the N1 winding of the flyback switching transformer is connected to the 3 pin of the high-voltage MOS, the N2 winding is connected to the secondary rectification circuit, and the secondary capacitor π filter outputs VOUT, The rectifier circuit is connected to the feedback circuit, the feedback circuit is connected to the PWM control IC circuit, the driving MOSFET is connected to the tran...

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Abstract

The invention belongs to the field of flyback switching power supply design of a PWM control circuit. The power supply uses an enhanced voltage dependent resistor, secondary voltage dependent clampingstep down, and a high-voltage MOS voltage divider circuit to realize triple lightning surge protection in a wide power input range. The output signal of the flyback power supply is adjusted by an optocoupler feedback, and then is transferred to a PWM control IN circuit so as to further control a PWM duty cycle to drive a MOSFET power transistor, and then control the output of the flyback transformer to complete closed-loop control and supply power to the control IC. In the operation of the power supply, the fusion of capacitor [pi]-type filtering (CLC) and frequency-jittering technology can not only improve electromagnetic interference (EMI) in a wide range of high and low frequency bands, but also disperse the prominent harmonic components of the switching frequency and effectively reduce its EMI and output ripple noise, thereby meeting the requirements of the flyback power supply for stable and reliable operation in harsh environments.

Description

technical field [0001] The invention relates to a technology for effectively improving the input range, surge protection capability and reducing EMI in a switching power supply circuit, especially the design of triple surge protection to achieve lightning surge waves above 20KA, removal of electrolytic capacitors behind the bridge, and cascaded MOS It is a new design method of power supply protection. Background technique [0002] Lightning surge is a surge voltage and surge current formed by natural lightning that induces objects, or power system switching transients and faults that exceed the normal operating voltage and current peak value. Its energy is huge, and tens of kilovolts and tens of kiloamperes of inrush current are generated in microseconds in an instant, which directly leads to failure and damage of equipment connected to the grid. As its core component, the power supply is directly connected to the grid and is subject to external interference or lightning sur...

Claims

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Application Information

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IPC IPC(8): H02M1/32H02M1/44
CPCH02M1/32H02M1/44
Inventor 王清金仝建侯荣立
Owner QINGDAO TOPSCOMM COMM
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