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Switch power supply with constant voltage/constant current output and control method thereof

A switching power supply, constant current output technology, applied in conversion equipment without intermediate conversion to AC, emergency power supply arrangements, electrical components, etc., can solve the problems of high requirements for operational amplifier design parameters, increased cost, and increased circuit design difficulty. , to achieve the effect of reducing design difficulty and cost, reducing power loss and reducing cost

Active Publication Date: 2010-10-20
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that adopting the existing design scheme not only needs to add another output capacitor and operational amplifier, but also has high requirements on the design parameters of the operational amplifier, which increases the cost and increases the difficulty of circuit design.

Method used

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  • Switch power supply with constant voltage/constant current output and control method thereof
  • Switch power supply with constant voltage/constant current output and control method thereof
  • Switch power supply with constant voltage/constant current output and control method thereof

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Embodiment Construction

[0047] Preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments. The present invention covers any alternatives, modifications, equivalent methods and schemes made on the spirit and scope of the present invention. In order to provide the public with a thorough understanding of the present invention, specific details are set forth in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details.

[0048] Hereinafter, the preferred embodiment of the switching power supply according to the present invention will be described in detail by taking the SEPIC single-ended primary inductor topology as an example.

[0049] figure 2 Shown is a schematic circuit diagram of a switching power supply with constant voltage / constant current output according...

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Abstract

The invention relates to a switch power supply with constant voltage / constant current output and a control method thereof. The switch power supply comprises a PWM control circuit and a power switching device, a first feedback circuit and a second feedback circuit, wherein the first feedback circuit is used for detecting a secondary inductive circuit and generating a first error amplification signal representing the output current information of the switching power supply circuit; and the second feedback circuit is used for detecting an output voltage and generating a second error amplification signal representing the output voltage information of the switching power supply circuit. When the switching power supply is in a first load condition, a switchover control circuit outputs a first control signal to the PWM control circuit, and the switching power supply outputs a constant voltage; when the switching power supply is in a second load condition, the switchover control circuit outputs a second control signal to the PWM control circuit, and the switching power supply outputs constant current.

Description

technical field [0001] The invention relates to a switching power supply circuit, which belongs to the technical field of power supplies, in particular to a switching power supply with constant voltage and constant current output. Background technique [0002] With the development of switching power supply technology, switching power supplies are widely used in various occasions such as communications and computers. When using a switching power supply as a power supply for a USB interface, a notebook computer, or other current-limiting ports, it is usually required that the switching power supply can provide a constant voltage output under normal load, and when the output is overloaded such as a short circuit and other abnormal conditions, it is required. The switching power supply can provide constant current output to avoid damage to the USB interface and other devices. [0003] In the prior art, an operational amplifier with constant current modulation is usually added o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/07H02J9/06
Inventor 陈伟
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD
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