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Control circuit of switching power supply and switching power supply

A technology of switching power supply and control circuit, which is applied in the direction of control/regulation system, electrical components, and adjustment of electric variables, etc. It can solve the problems of poor dynamic performance of switching power supply, large undershoot peak voltage, etc., and achieve the effect of improving dynamic performance

Active Publication Date: 2011-05-11
BCD (SHANGHAI) MICRO ELECTRONICS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under this condition, the output voltage Vout of the system will have a large undershoot peak voltage, such as figure 2 As shown, the dynamic performance of switching power supply is poor

Method used

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  • Control circuit of switching power supply and switching power supply
  • Control circuit of switching power supply and switching power supply
  • Control circuit of switching power supply and switching power supply

Examples

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Embodiment Construction

[0052] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0053] The control circuit of the switching power supply provided by the embodiment of the present invention includes: an output voltage monitoring module arranged on the secondary winding of the transformer, which is used to monitor the output voltage of the system, and when the output voltage is detected to be less than or equal to the set value, a switching A pulse signal, the switching pulse signal will generate a ringing signal.

[0054]It should be noted that the output voltage monitoring module includes three ports: the input end is connected to the output voltage of the system; one port is grounded; the output end is connected to the secondary winding.

[0055] The output end can be connected to the same-named end of the second...

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Abstract

The embodiment of the invention provides a control circuit of a switching power supply and a switching power supply. The control circuit comprises an output voltage monitoring module which is arranged at the secondary winding of a transformer for monitoring the output voltage of the system and generating a switching pulse signal when the output voltage is monitored to be smaller than or equal to a set value, wherein the switching pulse signal and a ringing signal induced by the switching pulse signal are fed back to the FB end of a controller through the secondary winding and an auxiliary winding; and a controller which is used for switching on a power switching tube when the switching pulse signal and / or the ringing signal are monitored at the FB end, so that the energy at the input end of the switching power supply is transmitted to the output end. When the system is instantaneously switched from no-load or light-load to heavy-load, the control circuit can avoid large undershot peak voltage of the output voltage Vout, so as to improve the output dynamic performance of the switching power supply.

Description

technical field [0001] The invention relates to the technical field of switching power supplies, in particular to a control circuit of a switching power supply and a switching power supply. Background technique [0002] Switching power supply has the advantages of small size, high efficiency and large current, so it is widely used in mobile phone chargers and notebook computer adapters and other occasions. [0003] The circuit diagram of the switching power supply in the prior art is introduced below. [0004] see figure 1 , which is a circuit diagram of a switching power supply in the prior art. [0005] The input AC voltage Vac passes through the rectifier bridge 102 and the input filter capacitor 103 to obtain the input voltage Vin. When the system is started, power is supplied to the power supply VCC of the controller 101 through the start resistor 104 . [0006] The transformer is composed of a primary winding 105 , a secondary winding 106 and an auxiliary winding 1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
Inventor 朱亚江谢佳张永铂陈超吕述庄
Owner BCD (SHANGHAI) MICRO ELECTRONICS LTD
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