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Flyback switching power supply

A switching power supply and flyback technology, applied in the direction of electrical components, adjusting electrical variables, high-efficiency power electronic conversion, etc., can solve problems such as product loss, temperature rise of power devices, changing operating frequency, etc., to achieve temperature rise reduction and output capacity strong effect

Active Publication Date: 2020-02-28
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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  • Flyback switching power supply
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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 invention provides a flyback switching power supply, which comprises a power supply input and rectification circuit, a DC-DC switching circuit and a voltage and current feedback circuit. The DC-DCswitching circuit comprises a PWM control integrated circuit U1. The PWM control integrated circuit U1 is provided with a GND end, an FB end, a Vin end, an RI end, an RT end, a Sense end, a VDD end and a Gate end. The flyback switching power supply further comprises a frequency adjusting circuit connected between the FB end and the RI end of the PWM control integrated circuit. The frequency adjusting circuit is used for changing the working 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 in a light load state, the working frequency is reduced by the frequency adjusting circuit. When the flyback switching power supply is in a heavy load state, the working frequency is increasedby the frequency adjusting circuit. Compared with the prior art, the flyback switching power supply has the advantage that the working frequency can be adjusted according to the working environment, so that the flyback switching power supply is suitable for wider occasions, energy can be saved, and temperature rise can be reduced.

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