Control method and circuit of switching power supply

A technology of switching power supply and control method, applied in the direction of control/regulation system, high-efficiency power electronic conversion, electrical components, etc., can solve the problems of changing operating frequency and low efficiency of switching power supply, and achieve the effect of improving efficiency

Active Publication Date: 2021-07-09
SHAANXI REACTOR MICROELECTRONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a control method of a switching power supply, which is used to solve the technical problems that the working frequency of the COT-controlled buck cannot be reliably changed according to the load and the efficiency of the switching power supply is low in the prior art

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  • Control method and circuit of switching power supply
  • Control method and circuit of switching power supply
  • Control method and circuit of switching power supply

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Embodiment Construction

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

[0039] The embodiment of the present application provides a control method for a switching power supply, which is applied to a COT (constant on time, constant on-time) controlled buck (that is, a step-down conversion circuit), such as figure 2 As shown, the method includes the following steps:

[0040] In step S101, a load voltage is obtained, and a matching voltage range matching the load voltage is determined from a plurality of preset voltage ranges.

[0041] In this embodiment, the lo...

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Abstract

The invention discloses a control method and circuit of a switching power supply, applied to buck of COT control. The method comprises the following steps: obtaining a load voltage, and determining a matching voltage range matched with the load voltage from a plurality of preset voltage ranges; determining the charging current of the COT according to the matching voltage range; and determining the working frequency of buck controlled by the COT according to the charging current. The charging current is kept constant when the load voltage does not exceed the matching voltage range, and is different when the load voltage is in different preset voltage ranges, and segmented control is performed based on the load voltage to make the charging current is kept unchanged when the load voltage is in a certain voltage range, so the working frequency of the buck is changed, and the efficiency of the buck is improved.

Description

technical field [0001] The present application relates to the technical field of power electronics, and more specifically, to a control method and circuit of a switching power supply. Background technique [0002] Switching power supply is a kind of power supply that uses modern power electronic technology to control the time ratio of switching on and off to maintain a stable output voltage. It is widely used in almost all electronic equipment with the characteristics of small size, light weight and high efficiency. An indispensable power supply method for the rapid development of the electronic information industry. Therefore, its conversion efficiency is highly concerned by the industry. [0003] The operating frequency of the traditional COT controlled buck is constant. In the prior art, in order to solve the problem that the efficiency of the switching power supply decreases continuously as the load is reduced, a frequency reduction method is adopted. However, the curv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/158H02M1/088H02M1/42
CPCH02M3/158H02M1/088H02M1/42Y02B70/10
Inventor 何世宝夏勤
Owner SHAANXI REACTOR MICROELECTRONICS
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