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Control circuit of multi-channel power converter

A technology for power converters and control circuits, which is applied in output power conversion devices, conversion of DC power input to DC power output, and control/regulation systems, etc., can solve the problem that the control circuit is difficult to synchronize switching signals, etc.

Active Publication Date: 2009-06-24
SYST GEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The switching frequency of these prior art changes in response to load changes, making it difficult for the control circuit to synchronize the switching signals

Method used

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  • Control circuit of multi-channel power converter
  • Control circuit of multi-channel power converter
  • Control circuit of multi-channel power converter

Examples

Experimental program
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Embodiment Construction

[0012] figure 1 A power converter with two switching channels is shown. The first channel is a first converter of a standby power supply. The first converter contains the switching signal S 1 , to generate an output V at the output of the power converter 01 . The second channel is the second converter, which contains the switching signal S 2 , to generate another output V at the output of the power converter 02 . input signal C NT available for the output V 02 Perform switch ON / OFF. input signal C NT connected to the control circuit 100 to enable or disable the switch signal S 2 . The control circuit 100 is further coupled to the output of the power converter to respond to the feedback signal V FB1 and the feedback signal V FB2 while generating the switching signal S 1 and switching signal S 2 . Feedback signal V FB1 and the feedback signal V FB2 Generated by the feedback control circuit 70. Feedback control circuit 70 is coupled to the output of the power c...

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Abstract

The invention provides a control circuit of a multi-channels power converter to save the power in the circumstance of light loading. The control circuit comprises a modulation circuit and a oscillating circuit, which modulates the switch frequency of the switch signal to save the electricity. The modulation circuit is in answer to the modulation signal generated by the first feedback signal and the second feedback signal. The oscillating circuit couples to the modulation circuit to control the switch frequency of the switch signal based on the modulation signal. The switch frequency of the first switch signal is reduced linearly answering for the reduction of the load when starting the second switch signal. The switch frequency of the first switch signal may be further reduced when stopping the second switch signal.

Description

technical field [0001] The present invention relates generally to power converters and, more particularly, to control circuits for switching power converters. Background technique [0002] Multi-channels power converters are used to convert an unregulated power supply to a regulated voltage and / or current source. The control circuitry of the multi-channel power converter generates switching signals for stabilizing the regulated output. That is, the duty cycle of the switching signal is modulated according to the output of the power converter. The switching signals need to be synchronized to reduce switching noise and electromagnetic interference (EMI). However, under light or no-load conditions, switching in synchronization results in higher power consumption. In recent research, many control circuits for power converters to save their power loss under light load conditions have been proposed, such as Yang's application for "PWM controller having off-time modulation for p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335
CPCY02B70/16H02M3/33561H02M2001/0032H02M1/0032Y02B70/10
Inventor 杨大勇
Owner SYST GEN