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Circuit for reducing turn-on time of current control type switch adjusting system

A switching regulation and turn-on time technology, applied in the direction of high-efficiency power electronic conversion, electrical components, output power conversion devices, etc., can solve the problems of output voltage drop, affecting the normal operation of the circuit, etc. The effect of good dynamic responsiveness

Active Publication Date: 2013-11-27
SUZHOU ZHIPU XINLIAN ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] However, if the output load is dynamically switched, the load suddenly switches from light load to full load, because the feedback information fed back by the primary side needs to be sampled in the next cycle, then within a cycle time, the controller due to the feedback from the primary side cannot detect The output voltage information will cause the output voltage to continue to drop, which will affect the normal operation of the circuit

Method used

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  • Circuit for reducing turn-on time of current control type switch adjusting system
  • Circuit for reducing turn-on time of current control type switch adjusting system
  • Circuit for reducing turn-on time of current control type switch adjusting system

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[0044] figure 1 The circuit diagram of the flyback converter built by the existing constant current and constant voltage controller fed back by the primary side; Figure 4 It is a circuit diagram of a flyback converter constructed by a circuit for reducing the turn-on time in the current control switching regulation system of the present invention. Such as figure 1 and Figure 4 As shown, the basic circuit structure of the present invention is: the constant current and constant voltage controller fed back in the existing primary side is figure 1 An exponential wave generator 440, a second comparator 442 and an OR gate 444 are added on the basis of the constant current and constant voltage controller 175 fed back by the primary side as shown, forming the reduced current control type switch regulation system of the present invention Circuit 475 for on-time.

[0045] Figure 4 It is the circuit diagram of the flyback converter built by the present invention, the circuit 475 ...

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Abstract

The invention discloses a circuit for reducing turn-on time of a current control type switch adjusting system. An exponential wave generator, a second comparator and a or gate are additionally arranged for the circuit based on an existing primary side-feedback constant current constant voltage controller. The circuit is additionally arranged, so that a flyback converter constructed by the circuit is not limited by leading edge blanking time any more, that is, shorter turn-on time and higher lowest switch frequency can be realized without load. Therefore, the flyback converter constructed by the circuit has better dynamic response capacity and lower standby power consumption than that of a flyback converter constructed by an existing primary side-feedback constant current constant voltage controller in a same condition.

Description

technical field [0001] The invention relates to a current control switch regulation system, in particular to a circuit for reducing the turn-on time in the current control switch regulation system. Background technique [0002] In recent years, handheld personal communication terminals (such as mobile phones) have developed rapidly, and the related charger market has also developed accordingly. Among them, the flyback converter is widely used in this field due to its own cost and performance advantages. Various constant-current and constant-voltage controllers using primary-side feedback are also widely accepted and used because of their simple peripheral structure and low cost. [0003] Existing flyback converters built with constant current and constant voltage controllers fed back from the primary side, such as figure 1 As shown, it includes: rectifier bridge 153, Π-type filter 154, absorption circuit 155, transformer 156 (which is composed of primary winding 161, secon...

Claims

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Application Information

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IPC IPC(8): H02M1/08
CPCY02B70/16Y02B70/10
Inventor 杨全边彬陈畅
Owner SUZHOU ZHIPU XINLIAN ELECTRONICS TECH
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