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Rectifier tube control circuit and light load control method thereof

A technology for controlling circuits and control methods, applied in control/adjustment systems, electrical components, and adjustment of electrical variables, etc., can solve problems such as low stability, and achieve the effects of avoiding frequent jumps, stable control, and high rectification efficiency

Active Publication Date: 2013-01-09
CHENGDU MONOLITHIC POWER SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method changes the rectification method as long as a load change is detected, and the stability is still not high.

Method used

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  • Rectifier tube control circuit and light load control method thereof
  • Rectifier tube control circuit and light load control method thereof
  • Rectifier tube control circuit and light load control method thereof

Examples

Experimental program
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Embodiment Construction

[0037] image 3 A state flow chart of the light load modulation embodiment of the present invention is shown. The light-load modulation mode is to stop the synchronous rectification and enter the non-synchronous rectification when and only when the light load lasts for a certain period of time in the synchronous rectification state. In the non-synchronous state, synchronous rectification is started if and only if it is under heavy load for several consecutive cycles. See the status flow for the specific control process image 3 . The meanings of each node from S0 to S4_C are:

[0038] S0: start the control circuit, set the light load factor K=1 (indicating heavy load);

[0039] S1: The rectifier is turned off;

[0040] S2_A: The rectifier device is turned on synchronously;

[0041] S2_B: The rectifier device is turned on asynchronously;

[0042] S3_A, S3_B: measure V DS ;

[0043] S4_A: set K=1;

[0044] S4_B: Keep K unchanged;

[0045] S4_C: ​​Set K=0.

[0046] A ...

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Abstract

Disclosed is a light load control circuit and the method accordingly where the synchronous rectification is latched off when the light load condition is detected for several successive cycles.

Description

technical field [0001] The invention relates to an isolated voltage converter, in particular to the control of stopping the synchronous rectification of the voltage converter at light load. Background technique [0002] There are currently two types of secondary side rectification schemes for flyback DC-DC converters, one is non-synchronous rectification (such as Figure 1A shown), the other is synchronous rectification (such as Figure 1B shown). The asynchronous rectification is conducted through the diode, and the synchronous rectification uses the gate drive signal to control the opening and closing of the synchronous rectification tube, and the synchronous rectification tube generally uses a MOSFET tube. Figure 1C The curves show the resistance characteristics of diodes and synchronous rectifiers. In practical applications, the working range of the low-power flyback DC-DC converter is in the shaded range. In this interval, the resistance characteristic curve 11 of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/00
CPCY02B70/16Y02B70/1475H02M2001/0032H02M3/33592H02M1/0032Y02B70/10
Inventor 任远程张军明缪磊毛昭祺
Owner CHENGDU MONOLITHIC POWER SYST
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