System and method for power supply transformation system protection at least based on feedback signal

A technology of power conversion and feedback signal, which is used in emergency protection circuit devices, electrical components, etc.

Active Publication Date: 2013-06-19
ON BRIGHT ELECTRONICS SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0021] However, when the power conversion system 100 operates in constant current mode, the power conversion system 100 needs to be protected

Method used

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  • System and method for power supply transformation system protection at least based on feedback signal
  • System and method for power supply transformation system protection at least based on feedback signal
  • System and method for power supply transformation system protection at least based on feedback signal

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Embodiment Construction

[0045] The present invention relates to integrated circuits. More specifically, the present invention provides systems and methods for protecting a power conversion system based at least on a feedback signal. Merely by way of example, the invention has been applied to a flyback power conversion system. It will be appreciated, however, that the invention has a much broader range of applicability.

[0046] image 3 is a simplified diagram showing a power conversion system with primary side sensing and regulation. The power conversion system 300 includes a primary winding 310, a secondary winding 312, an auxiliary winding 314, a power switch 320, a current sense resistor 330, an output cable equivalent resistor 340, resistors 350 and 352, a rectifier diode 360 ​​and a control device 370. Controller 370 includes sampling component 302, demagnetization detector 304, capacitor 306, switch 307, reference signal generator 308, oscillator 316, AND gate 318, drive component 322, OR g...

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PUM

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Abstract

The invention discloses a system and a method for power supply transformation system protection at least based on feedback signal. An example system controller comprises a protection component and a driving component, wherein the protection component is arranged to receive demagnetization signals generated by information relevant to feedback signals at least based on the power supply transformation system, process the information relevant to the detected voltage generated by information relevant to the demagnetization signals and the feedback signals, and generate protection signals at least based on the information relevant to the detected voltage and the demagnetization signals. The driving component is arranged to receive the protection signals and output driving signals to a switch which is arranged to affect a primary current running through a primary winding of the power supply transformation system. The detected voltage is relevant to the output voltage of the power supply transformation system, the demagnetization signals are relevant to the time intervals of the demagnetization of the power supply transformation system.

Description

technical field [0001] The present invention relates to integrated circuits. More specifically, the present invention provides systems and methods for protecting a power conversion system based at least on a feedback signal. Merely by way of example, the invention has been applied to a flyback power conversion system. It will be appreciated, however, that the invention has a much broader range of applicability. Background technique [0002] Generally, conventional power conversion systems usually use a transformer to isolate the input voltage on the primary side and the output voltage on the secondary side. To regulate the output voltage, certain components such as TL431 and optocoupler can be used to send a feedback signal from the secondary side to the controller chip on the primary side. Alternatively, the output voltage on the secondary side can be mirrored to the primary side, so the output voltage is controlled by directly adjusting some parameter on the primary sid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/12
Inventor 张允超林元张秀红方烈义
Owner ON BRIGHT ELECTRONICS SHANGHAI
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