Control chip of primary-side feedback switch power source

A switching power supply, primary-side feedback technology, applied in control/regulating systems, electrical components, regulating electrical variables, etc., can solve problems such as power limitation, application is not too flexible, common triode is not suitable, and achieves cost reduction and reliability. sexual effect

Active Publication Date: 2012-08-01
江苏华芯智造半导体有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The special feature of TOP221-227 switching power supply control chip is that a MOS switch tube is integrated into the chip, and the drain of the MOS switch tube is used as the current signal collection point of the primary winding Np inside the chip. When the MOS switch tube is turned on, the source and the drain are equivalent to the control realized by a resistance characteristic. Although the TOP221-227 switching power supply control chip has very few external pins and the external circuit is relatively simple, its existing problem lies in Its power is limited by the power of the integrated MOS switch tube, so it is not very flexible to use. At the same time, in low-cost applications, the switch tube mostly uses ordinary triodes. Obviously, the structural characteristics of TOP221-227 switching power supply control chips determine the Ordinary triodes are not suitable

Method used

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  • Control chip of primary-side feedback switch power source
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  • Control chip of primary-side feedback switch power source

Examples

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Embodiment 1

[0032] Embodiment 1: A primary side feedback switching power supply control chip provided by this preferred embodiment, as attached figure 2 As shown, the control chip 1 includes a voltage control unit 101, an RS flip-flop 102, a chopper unit 103, a drive unit 104, a current control unit 105, and three pins VDD, GND, and OUT. The chopper Unit 103 uses a PFM unit in this preferred embodiment, and its output is amplified by the drive unit 104 and output to the base of the power transistor G by the OUT pin to drive the power transistor G. The voltage control unit 101 and the current control unit 105 are respectively connected to the S terminal and the R terminal of the RS flip-flop 102 to control the chopper unit 103 through the RS flip-flop 102. In this preferred embodiment, the voltage control unit 101 is a constant voltage control unit. In a preferred embodiment, the VDD pin is used as a feedback voltage collection point, and the OUT pin is used as a primary side current sign...

Embodiment 2

[0033] Embodiment 2: A primary side feedback switching power supply control chip provided by this preferred embodiment, as attached image 3 As shown, the difference from Embodiment 1 is that the voltage control unit 101 is a constant current control unit, and at the same time, in order to cooperate with the constant current control, a voltage-controlled oscillation unit 110 is added at the front end of the voltage control unit 101, so The input terminal of the voltage controlled oscillation unit 110 is connected to the VDD pin, the output terminal of the controlled oscillation unit 110 is connected to the voltage control unit 101, and the voltage controlled oscillation unit 110 mainly cooperates with the voltage control unit 101 according to the feedback voltage collected from The point is that the feedback voltage signal collected by the VDD pin performs constant current control on the system.

[0034] In summary, a primary side feedback switching power supply control chip o...

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Abstract

A control chip of a primary-side feedback switch power source comprises a voltage control unit (101), an RS trigger (102), a chopper unit (103), a driving unit (104), a current control unit (105) and three pins VDD, GND and OUT. The pin OUT outputs to drive an external switch tube after the chopper unit (103) is amplified by the driving unit (104), the voltage control unit (101) and the current control unit (105) are respectively connected with an S end and an R end of the RS trigger (102) respectively to control the chopper unit (103) through the RS trigger. The control chip is characterized in that the pin VDD is used as a feedback voltage collecting point, and the pin OUT is used as a primary-side current signal collecting point. The control chip of the primary-side feedback switch power source solves the problems of high withstand voltage and cost and non-flexible application of a control chip in the prior art.

Description

technical field [0001] The invention relates to a primary-side feedback switching power supply control chip, which belongs to the switching power supply control device category. Background technique [0002] Switching power supply is a commonly used AC-to-DC power supply device today. The primary side feedback switching power supply can not only adjust the output voltage according to the feedback information, but also properly adjust the output current according to the current information detected from the primary side. Therefore, the application of switching power supply with primary side feedback is more and more extensive, and many primary side feedback switching power supply control chips have appeared correspondingly. [0003] The inventor of this case has noticed a primary feedback switching power supply controller disclosed in CN102237812A. Although the primary feedback switching power supply controller disclosed in CN102237812A has changes in the voltage control loop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
Inventor 赖泽联
Owner 江苏华芯智造半导体有限公司
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