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Flyback switching power supply

一种开关电源、反激式的技术，应用在电气元件、调节电变量、高效电力电子转换等方向，能够解决功率器件温升、产品损耗、改变工作频率等问题，达到输出能力强、温升降低的效果

Active Publication Date: 2021-04-16
CHANGZHOU GLOBE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When widely used in various occasions, because the existing flyback switching power supply cannot change the operating frequency according to the working environment or working scene, it will cause the temperature rise of some power devices
Especially in the case of high ambient temperature, it is easy to cause product loss

Method used

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Embodiment Construction

[0019] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0020] see figure 1 As shown, the present invention discloses a flyback switching power supply, including a power input and rectification circuit 100 , a DC-DC switching circuit 200 , a secondary rectification output circuit 300 , a voltage and current feedback circuit 400 and a frequency adjustment circuit 500 . Wherein, the DC-DC switch circuit 200 has a PWM control integrated circuit U1. The PWM control integrated circuit U1 has a GND terminal, a FB terminal, a Vin terminal, a RI terminal, a RT terminal, a Sense terminal, a VDD terminal and a Gate terminal. The frequency adjustment circuit 500 is connected between the FB terminal and the RI terminal, and is used to change the operating frequency of the flyback switching power supply according ...

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Abstract

The present invention provides a flyback switching power supply, including a power input and rectification circuit, a DC-DC switch circuit and a voltage-current feedback circuit, the DC-DC switch circuit includes a PWM control integrated circuit U1, and the PWM control integrated circuit U1 has GND terminal, FB terminal, Vin terminal, RI terminal, RT terminal, Sense terminal, VDD terminal and Gate terminal. The flyback switching power supply also includes a frequency adjustment circuit connected between the FB terminal and the RI terminal of the PWM control integrated circuit. The above frequency adjustment circuit is used to change the operating frequency of the flyback switching power supply according to the working state of the flyback switching power supply: when the flyback switching power supply is under light load, the frequency adjustment circuit will lower the operating frequency; when the flyback switching power supply When the power supply is under heavy load, the frequency regulation circuit will increase the operating frequency. Compared with the prior art, the flyback switching power supply of the present invention can adjust the operating frequency according to the working environment, so it is applicable to a wider range of occasions, and can save energy and reduce temperature rise at the same time.

Description

technical field [0001] The invention relates to a control circuit, in particular to a control circuit of a flyback switching power supply. Background technique [0002] In the manufacture of electrical equipment, compared with the traditional transformer step-down linear power supply, switching power supply has the advantages of small size, light weight, high efficiency and energy saving. Its power supply can adapt to both AC power supply and DC power supply, and the power supply voltage range is wide. Therefore, the application of switching power supply is more and more extensive. [0003] At present, most low-power switching power supplies on the market use flyback switching power supplies. When widely used in various occasions, because the existing flyback switching power supply cannot change the operating frequency according to the working environment or working scene, it will cause the temperature rise of some power devices. Especially in the occasions where the ambi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335
CPCH02M3/33523H02M3/33507H02M1/0032Y02B70/10
Inventor 朱艳强
Owner CHANGZHOU GLOBE CO LTD
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