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Multiphase switching mode power supply, and drive circuit and control method thereof

A technology of power supply and drive circuit, which is applied in the direction of control/regulation systems, instruments, electrical components, etc., and can solve problems such as unnatural and inability to completely avoid sudden drops in output voltage

Inactive Publication Date: 2012-07-18
RICHTEK TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This forced increase / decrease of the duty ratio is not natural, and it still cannot completely avoid the sudden drop of the output voltage

Method used

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  • Multiphase switching mode power supply, and drive circuit and control method thereof
  • Multiphase switching mode power supply, and drive circuit and control method thereof
  • Multiphase switching mode power supply, and drive circuit and control method thereof

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Embodiment Construction

[0052] The basic technical idea of ​​the present invention is that when the load of the multi-phase switching power supply changes between light load and heavy load, that is, when the power level needs to be increased or decreased, according to the increase / decrease signal, the equalizer is turned off or adjusted. The gain of the current equalizing circuit of the current circuit 14 gradually increases or decreases the output current of the power stage that needs to be turned on or off, so as to avoid a sudden drop in the output voltage, thereby affecting the normal operation of the system.

[0053] image 3 An embodiment showing the basic structure of the present invention, wherein the first phase power stage 11 and the second phase power stage 22 can be, for example but not limited to Figures 2A-2J The synchronous or asynchronous step-down, step-up, reverse-voltage, or step-up-boost conversion circuit shown; for the convenience of description, it is assumed that the controll...

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PUM

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Abstract

The invention provides a multiphase switching mode power supply, and a drive circuit and a control method thereof. The multiphase switching mode power supply comprises at least two power levels and a current-sharing circuit, wherein the power levels switch power transistors to convert input voltage into output voltage respectively according to pulse width modulation (PWM) signals produced by corresponding controllers, and the current-sharing circuit generates current-sharing signals according to current in each of the power level and phase increasing or phase reducing signals, so that average distribution of current of each of the power level is achieved. According to the multiphase switching mode power supply, and the drive circuit and the control method thereof, gains of current-sharing circuit can be adjusted, so that output voltage swell or dip during phase conversion can be improved, and function of current-sharing is maintained.

Description

technical field [0001] The present invention relates to a multi-phase switchable power supply and its driving circuit and control method, in particular to a method for adjusting the gain of the current equalizing circuit to avoid sudden voltage rise or drop when increasing / decreasing the phase number of the operating power stage A multi-phase switching power supply and its drive circuit and control method. Background technique [0002] figure 1 A circuit schematic diagram of a multi-phase switching power supply in the prior art is shown, wherein the first-phase PWM (pulse width modulation, pulse width modulation) controller 11 and the second-phase PWM controller 21 respectively output PWM1 and PWM2 signals to control Respective power transistors in the first phase power stage 12 and the second phase power stage 22 are used to convert the input voltage Vin to the output voltage Vout. The feedback circuit 13 generates a feedback signal related to the output voltage Vout and ...

Claims

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Application Information

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IPC IPC(8): H02M3/156
Inventor 张育玮程元皇王珽弘李嘉荣郑仲圣
Owner RICHTEK TECH
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