Buck step-down circuit based on input voltage feedforward control and control method thereof
A technology of input voltage and control circuit, which is applied in the direction of control/regulation system, output power conversion device, DC power input conversion to DC power output, etc., which can solve the problems of large dynamic fluctuation amplitude and slow dynamic response, and achieve reduction Dynamic fluctuation amplitude, improve the effect of dynamic response
Active Publication Date: 2015-09-30
NANJING SILERGY SEMICON TECH CO LTD
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[0005] In view of this, the object of the present invention is to provide a Buck step-down circuit based on input voltage feedforward control and its control method, so as to solve the technical problems of slow dynamic response and large dynamic fluctuation amplitude in the prior art
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[0022] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments. The present invention covers any alternatives, modifications, equivalent methods and schemes made within the spirit and scope of the present invention.
[0023] In order to provide the public with a thorough understanding of the present invention, specific details are set forth in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details.
[0024] In the following paragraphs the invention is described more specifically by way of example with reference to the accompanying drawings. It should be noted that all the drawings are in simplified form and use inaccurate scales, which are only used to facilitate and clearly assist the purpose of illustrating the embodiments of t...
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The invention discloses a buck step-down circuit based on input voltage feedforward control and a control method of the buck step-down circuit. An input voltage feedforward control mode is adopted; input voltage sampling signals in direct proportion to the input voltage are used as control signals of a pressure control current source in a triangular wave signal generating circuit, so that the peak value of triangular wave signals and the input voltage form the direct proportion relationship; the triangular wave signals are compared with error amplifying signals, so that shut-off signals for shutting off a main power switch tube are obtained; during the normal work, output voltage is only relevant to the sampling coefficient of input voltage and is not directly correlated with the input voltage, so that the influence of the input voltage fluctuation on the output voltage is smaller; the dynamic response of a system is improved; meanwhile, the dynamic fluctuation amplitude of the output voltage is reduced.
Description
technical field [0001] The invention relates to the technical field of power electronics, in particular to a Buck step-down circuit based on input voltage feedforward control and a control method thereof. Background technique [0002] A Buck circuit generally includes a power stage circuit and a control circuit. The control circuit controls the switch state of the main power switch tube of the power stage circuit to adjust the output voltage, which is lower than the input voltage. The control circuit needs to feedback control the switch state of the main power switch tube according to the change of the output voltage. [0003] Such as figure 1 As shown, it is the output voltage control mode of the prior art, that is, the output voltage is sampled, and the error amplification process is performed between it and the reference signal to obtain the error amplification signal V E , the error amplifies the signal V E Compared with the triangular wave signal, the duty ratio sign...
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IPC IPC(8): H02M3/156
Inventor 张鑫
Owner NANJING SILERGY SEMICON TECH CO LTD