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Switching control circuit for power conversation

A technology of a power converter and a control circuit, which is applied to the output power conversion device, the conversion of DC power input to DC power output, and the conversion of AC power input to DC power output, etc. Switching control circuit, etc.

Active Publication Date: 2013-08-28
SYST GEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The response time of the phase latch circuit is limited, so it will limit the maximum operating frequency and speed of the switching control circuit (for example: switching control circuit 70)

Method used

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  • Switching control circuit for power conversation
  • Switching control circuit for power conversation
  • Switching control circuit for power conversation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0059] In order to make the structural features of the present invention and the achieved effects have a further understanding and recognition, preferred embodiments and detailed descriptions are specially used, which are described as follows:

[0060] see figure 2 , which is a circuit diagram of an embodiment of the switching control circuit of the present invention. The switching control circuit 100 is also a controller, which includes a switching circuit to receive the feedback signal V FB , to generate switching signal S W . The switching circuit includes a logic circuit and an input circuit (INPUT) 300 . The logic circuit includes a flip-flop 110 , an AND gate 115 , a comparator 150 , a NOR gate 151 and a NAND gate 152 . A clock generator 200 generates a clock signal C K , to determine the switching signal S W switching frequency. Clock signal C K It is coupled to a clock input terminal CK of the flip-flop 110 . An input terminal D of the flip-flop 110 receives ...

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PUM

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Abstract

The invention relates to a switching control circuit for power conversation, comprising an input circuit and a clock generator. The input circuit receives a feedback signal to generate a switch signal, the clock generator generates a clock signal to determine the switch frequency of the switch signal, the feedback signal is related to the output of the a power converter, the switch signal is used for switching a transformer of the power converter to adjust the output of the power converter, and before the switch frequency of the switch signal is converted from a low frequency to a high frequency, the pulse width of the switch signal is reduced.

Description

technical field [0001] The present invention relates to a power converter, in particular to a switching control circuit of the power converter. Background technique [0002] see figure 1 , which is a circuit diagram of a switching power converter. As shown in the figure, a switching control circuit 70 is based on a feedback signal V FB Generate a switching signal S W . Feedback signal V FB Associated with an output V of the power converter O . Through a transistor 20, the switching signal S W A transformer 10 of the power converter is switched. Therefore, through a transistor 40 and a capacitor 50, the transformer 10 will be from an input V of the power converter IN transfers power to the output of the power converter V O . The transformer 10 has a primary side and a secondary side. input V IN Provided to a primary side winding N located on the primary side P , and the secondary side produces an output V O . The secondary side has a secondary side winding N ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCH02M1/32H02M3/33507H02M3/33592Y02B70/10H02M7/537H02H7/1227
Inventor 杨大勇
Owner SYST GEN