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Resonant switching power supply circuit with low spike voltage

A switching power supply circuit, peak voltage technology, applied in the field of circuits

Pending Publication Date: 2018-03-09
GUANGDONG NRE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are few resonant switching power supply circuits with low peak voltage in the prior art

Method used

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  • Resonant switching power supply circuit with low spike voltage

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Embodiment Construction

[0017] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0018] Please refer to figure 1 , a low peak voltage resonant switching power supply circuit, the power supply circuit comprising:

[0019] The power-on flyback power PWM is used to output the positive pulse width level Q1;

[0020] a main transformer, the main transformer is connected to the power-on flyback power supply PWM, and is used to store energy through the primary winding inductance;

[0021] a resonant capacitor C, connected to the main transformer, for receiving the charging energy provided by the primary winding of the main transformer;

[0022] In addition, the resonant capacitor C...

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Abstract

The invention provides a resonant switching power supply circuit with a low spike voltage. The power circuit comprises a power-on flyback power supply PWM (Pulse-Width Modulation), a main transformerand a resonant capacitor C, wherein the power-on flyback power supply PWM is used for outputting a positive pulse width level Q1; the main transformer is connected with the power-on flyback power supply PWM and is used for storing energy by virtue of inductance of a primary winding; the resonant capacitor C is connected with the main transformer and is used for receiving charging energy provided by the primary winding of the main transformer; and in addition, the resonant capacitor C is further used for receiving a back electromotive force loaded at a DS end of the Q1. The flyback switching MOS (Metal Oxide Semiconductor) transistor DS end parallel resonant capacitor can achieve the effects of effectively reducing the spike voltage at the DS end of the switching MOS transistor, reducing the voltage power of the MOS transistor, reducing the switching loss of the MOS tube and reducing battery interference.

Description

technical field [0001] The invention relates to the field of circuits, in particular to a resonant switching power supply circuit with low peak voltage. Background technique [0002] In the pulse modulation circuit, R and L resonant circuits are added, so that the current flowing through the switch and the voltage drop at both ends of the tube are quasi-sine waves. This switching power supply becomes a resonant switching power supply. Using a certain control technology, the switching tube can be switched when the current or voltage waveform crosses zero, which is of great benefit to reducing the size of the power supply, increasing the control capability of the power supply, increasing the switching speed, and improving the ripple. Therefore, the resonant switching power supply is the mainstream technology in the current development of switching power supply. Divided into: 1. ZCS - zero current switch, the switch tube is turned off at zero current, 2. ZVS - zero voltage ...

Claims

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Application Information

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IPC IPC(8): H02M1/00
CPCH02M1/00H02M1/0038
Inventor 张光荣王锋邓世周
Owner GUANGDONG NRE TECH
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