Voltage modulation circuit capable of increasing light load efficiency

A technology of voltage modulation circuit and power conversion circuit, which is applied in the direction of output power conversion device, conversion equipment without intermediate conversion into AC, conversion of DC power input into DC power output, etc., which can solve the problem of unable to improve the loss and change the active switch drive Voltage and other issues

Inactive Publication Date: 2009-10-21
ACBEL POLYTECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the current voltage modulation circuit does not change the driving voltage of the active switch according to the medium-to-heavy load or light-load state of the

Method used

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  • Voltage modulation circuit capable of increasing light load efficiency
  • Voltage modulation circuit capable of increasing light load efficiency
  • Voltage modulation circuit capable of increasing light load efficiency

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Embodiment Construction

[0038] figure 1 Shown is the first preferred embodiment of the voltage modulation circuit of the present invention, the voltage modulation circuit includes a step-down power conversion circuit and a limit voltage jump circuit 30 . Among them, the step-down power conversion circuit includes:

[0039] A pulse width modulation controller 10, at least including a feedback voltage input terminal V FEB and a pulse width modulation output terminal PWM;

[0040] A switch driver 20, including a logic circuit unit and two power amplifiers, the logic circuit unit includes a pulse width modulation signal terminal PWM and two output terminals, wherein the pulse width modulation signal terminal PWM is connected to the output of the pulse width modulation controller 10 terminal PWM, the two output terminals are respectively connected to the input terminals of the corresponding power amplifiers, and the output terminals of the two power amplifiers are the two output terminals of the switch...

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Abstract

The invention relates to a voltage modulation circuit capable of increasing light load efficiency, comprising a voltage reduction power switching circuit and a limitation voltage modulation circuit, wherein the limitation voltage modulation circuit senses the level of electric current of the output end of the voltage reduction power switching circuit, judges the light load state or the medium-high load state of the load according to the level of the electric current, and regulates the level of the output voltage used for pushing the driving end of an automatic switch in a switch driver, namely when the output electric current of the voltage reduction power switching circuit is lower and tends to be zero, the current load is indicated to be in the light load state, and the limitation voltage modulation circuit can lower the driving voltage of the automatic switch by regulation so as to realize the function of reducing the driver loss; and on the other hand, when the output electric current of the voltage reduction power switching circuit is increased, the load is indicated to be in the medium-high load state, and the limitation voltage modulation circuit can increase the driving voltage of the automatic switch by regulation so as to reduce the conduction loss.

Description

technical field [0001] The invention relates to a voltage modulation circuit, in particular to a voltage modulation circuit with a light-load efficiency improvement function, which has the function of improving power conversion efficiency under light-load conditions. Background technique [0002] In the voltage modulation circuit used by the central processing unit, a stable working voltage must be provided to the central processing unit. Therefore, for the voltage modulation circuit, the central processing unit is its load. However, since the central processing unit will be in a busy or idle state based on user operations, the load will be in a heavy or light power consumption state at different times. Therefore, for the voltage modulation circuit, it is necessary to provide a stable working voltage according to the current load state. [0003] Usually, the existing single-voltage output voltage modulation circuit is applied to the power supply circuit of the low-voltage l...

Claims

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Application Information

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IPC IPC(8): H02M3/10H02M3/155H02M3/156
Inventor 吴峰羽张政权朱俊杰
Owner ACBEL POLYTECH INC
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