Control method and control circuit of switching power supply and switching power supply
A technology of switching power supply and control method, applied in the direction of control/regulation system, electrical components, regulating electrical variables, etc., can solve problems such as large output voltage ripple, and achieve the effect of reducing output voltage ripple
Pending Publication Date: 2022-03-15
JOULWATT TECH INC LTD
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Problems solved by technology
[0004] In view of this, the object of the present invention is to provide a control method, a control circuit and a switching power supply for a switching power supply to solve the technical problem of large output voltage ripple caused by load switching in the prior art
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[0043] 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.
[0044] 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.
[0045] 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 the...
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The invention discloses a control method and a control circuit of a switching power supply and the switching power supply, and the method comprises the steps: obtaining a limit value adjustment signal according to a working mode of the switching power supply and a switching signal of a main power switching tube, and obtaining a limit value of an inductive current according to a first compensation signal and the limit value adjustment signal, and the control circuit is used for sampling inductive current information of the switching circuit to obtain a current sampling signal, and generating the switching signal according to a limit value of the inductive current and the current sampling signal, and the switching signal is used for controlling on and off of the main power switching tube. According to the scheme, in different working modes, the difference values of the upper limit and the lower limit of the inductive current are set to be different, so that the output voltage ripple is small in the load switching process of the switching power supply.
Description
technical field [0001] The present invention relates to the technical field of power electronics, and more specifically, relates to a control method, a control circuit and a switching power supply of a switching power supply. Background technique [0002] In the circuit control of the current switching power supply, the output voltage is controlled by controlling the turn-on and turn-off of the main power switch tube in the switch circuit. The switching circuit includes a BUCK (step-down) circuit, a BOOST (boost) circuit and other circuit structures. For example, figure 1 It is a schematic diagram of the circuit structure of a BUCK (step-down) circuit, such as figure 1 As shown, the BUCK circuit includes a first switching tube M00, a second switching tube D00 and an inductor L00, wherein the first switching tube M00 is a main power MOS tube, the second switching tube D00 is a freewheeling diode, and Vin is a BUCK circuit Vout is the output voltage of the BUCK circuit. By ...
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IPC IPC(8): H02M1/08H02M3/156H02M3/04H02M1/14
CPCH02M1/08H02M3/156H02M3/04H02M1/14Y02B70/10
Inventor 窦训金黄必亮
Owner JOULWATT TECH INC LTD