Two-sided modulation type pulse width modulation controller and method thereof

A pulse width modulation and modulation technology, applied in the direction of pulse duration/width modulation, control/regulation system, instrument, etc., can solve the problem that the PWM signal cannot respond in time, achieve simple network compensation, reduce delay time, fast transient The effect of state change

Active Publication Date: 2009-12-09
HANGZHOU MPS SEMICON TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

That is to say, during this period, if the load has a transient change, the PWM signal cannot respond in time

Method used

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  • Two-sided modulation type pulse width modulation controller and method thereof
  • Two-sided modulation type pulse width modulation controller and method thereof
  • Two-sided modulation type pulse width modulation controller and method thereof

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Embodiment Construction

[0024] figure 2 It is a schematic diagram of a typical PWM control waveform of the present invention. Looking from top to bottom, the curve Vi+Vbias with a small slope is the sum of the current feedback signal Vi representing the output current value and a DC bias value Vbias. Vi is proportional to the inductor current, and Vi+Vbias is referred to as the current signal. The curve Vtri+Vc with a larger slope is the sum of the compensation signal Vc and a symmetrical triangular wave signal Vtri, and Vtri+Vc is referred to as the compensation triangular wave signal. The Vtri wave slope Svtri in this control mode must be greater than the Vi wave slope Svi to realize the trigger function, that is, Svtri>Svi, Svtri>(Vin_max-Vout_min).Gcs / L, so L>(Vin_max-Vout_min).Gcs must be satisfied / Svtri, where Vin_max is the maximum input voltage, Vout_min is the minimum output voltage, and Gcs is the output current sampling gain. The function of the bias value Vbias is to raise the current...

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Abstract

The invention relates to a two-sided modulation type pulse width modulation controller performed and a method thereof. The control process of the two-sided modulation type pulse width modulation controller comprises the following steps: a first adder adds a supplement signal and a triangular wave or sawtooth wave signal; a second adder adds a current feedback signal and an offset value; the same-phase end of a comparer receives an output signal of the first adder, and the reverse-phase end of the comparer receives an output signal of the second adder so as to output a pulse width modulation waveform. The control mode of the two-sided modulation type pulse width modulation controller also has the advantages of current control and can also faster respond to transient change.

Description

technical field [0001] The invention relates to DC-DC converter control, in particular to bilateral modulation pulse width modulation control for improving transient response. Background technique [0002] Contemporary electronic devices put forward higher and higher requirements on the transient response of the power supply. For example, the central processing unit requires the power supply to respond to sudden load changes in a very short time. Currently, there are various control methods used in the control loop of the DC-DC converter power supply to achieve stable and normal power supply. [0003] Pulse Width Modulation (PWM) is the basic current-mode control method. figure 1 Shown is the PWM control waveform diagram triggered by the falling edge of the peak current mode. Compared with voltage mode control, current mode control has advantages in linear modulation, simple network compensation, etc. Such as figure 1 As shown, the top waveform is a compensated sawtooth ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/08H02M3/156
CPCH03K7/08H02M3/156
Inventor 欧阳茜孔晓丽任远程杨先庆
Owner HANGZHOU MPS SEMICON TECH
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