A control method and circuit of a 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: 2022-01-25
SHAANXI REACTOR MICROELECTRONICS
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AI Technical Summary

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

Method used

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  • A control method and circuit of a switching power supply
  • A control method and circuit of a switching power supply
  • A control method and circuit of a switching power supply

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Embodiment Construction

[0038] Next, the technical scheme in the present application embodiment will be described in the present application embodiment, and it is understood that the described embodiments are merely the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained without creative labor are not made in the pre-creative labor premises.

[0039] The present application example provides a control method of a switching power source, which is applied to a BUCK (ie, a buck conversion circuit) controlled by COT (constant on time, constant on time), such as figure 2 As shown, the method includes the following steps:

[0040] Step S101, the load voltage is acquired, and the matching voltage range that matches the load voltage is determined from the plurality of preset voltage ranges.

[0041] In this embodiment, the load voltage can be acquired or in the prior art, and the load voltage is compared with the p...

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Abstract

The invention discloses a control method and circuit of a switching power supply, which are applied to a COT-controlled buck. The method includes: obtaining a load voltage, and determining a matching voltage range matching the load voltage from a plurality of preset voltage ranges ; determine the charging current of the COT according to the matching voltage range; determine the operating frequency of the buck controlled by the COT according to the charging current; wherein, the charging current is when the load voltage does not exceed the matching voltage range Keep constant, and be different when the load voltage is in different preset voltage ranges, by segmental control based on the load voltage, the charging current remains constant when the load voltage is in a certain voltage range, thereby changing the The operating frequency of the buck improves the efficiency of the buck.

Description

Technical field [0001] The present application relates to the field of power electronics, and more particularly to control methods and circuits for switching power sources. Background technique [0002] The switching power supply is a time ratio using modern power electronic technology, controlling the opening and off, maintaining a power source of stable output voltage, and is widely used in small, lightweight and high efficiency, which is widely used. An indispensable power mode in the rapid development of electronic information industry. Therefore, its transformation efficiency is attached to the industry. [0003] The traditional COT-controlled BUCK operating frequency is constant. In the prior art, in order to solve the switching power supply efficiency, the curve is reduced as the load is reduced, and the curve reduction is used. However, the curve in the curve reduction process is multifaceted, which is prone to abnormalities. Inventive content [0004] The present invent...

Claims

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Application Information

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Patent Type & Authority Patents(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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