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Control method and control circuit of BUCK step-down circuit, and BUCK step-down circuit

A technology of step-down circuit and control circuit, which is applied in the direction of control/regulation system, electrical components, and adjustment of electrical variables, etc., which can solve problems such as large output current, deviation of output current value, poor linear adjustment rate, etc., and achieve optimal linearity The effect of adjustment rate

Pending Publication Date: 2019-04-02
JOULWATT TECH INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This output current control method is also based on the characteristics of linear rise and fall of the inductor current. When the inductor current rises nonlinearly, the value of the output current obtained by sampling the peak current of the inductor or the peak current of the main switch will have a deviation.
Therefore, under the condition of low input voltage, the output current of this control method will be too large, resulting in poor linear adjustment rate.

Method used

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  • Control method and control circuit of BUCK step-down circuit, and BUCK step-down circuit
  • Control method and control circuit of BUCK step-down circuit, and BUCK step-down circuit
  • Control method and control circuit of BUCK step-down circuit, and BUCK step-down circuit

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Embodiment Construction

[0023] The 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 solutions made within the spirit and scope of the present invention.

[0024] In order for the public to have a thorough understanding of the present invention, specific details are described in the following preferred embodiments of the present invention, and those skilled in the art can fully understand the present invention without the description of these details.

[0025] In the following paragraphs, the present invention is described in more detail by way of example with reference to the drawings. It should be noted that the drawings all adopt a relatively simplified form and all use imprecise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the emb...

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Abstract

The invention discloses a control method and control circuit of a BUCK step-down circuit and a BUCK step-down circuit. The control method comprises detecting the on-time of a main switch tube of the BUCK step-down circuit; when the on-time of the main switch tube is greater than a first time, decreasing the reference voltage of the BUCK step-down circuit as the on-time of the main switch tube increases, wherein the BUCK step-down circuit operates in a discontinuous conduction mode or a critical conduction mode. The control method can optimize the linear adjustment rate of the BUCK step-down circuit.

Description

Technical field [0001] The invention relates to the technical field of power electronics, and in particular to a BUCK step-down circuit control method, a control circuit and a BUCK step-down circuit. Background technique [0002] Please refer to figure 1 Shown is a traditional BUCK step-down circuit. In the BUCK step-down circuit with constant current output, in order to simplify the circuit, when the circuit works in critical conduction mode or discontinuous conduction mode, the peak current of the inductor or the peak current of the main switch tube is sampled to obtain the value of the output current. The control circuit controls the output current according to the value of the output current. This method does not need to sample the output current directly, but obtains the value of the output current by sampling the peak inductor current or the peak current of the main switch tube. The slope of the inductor current rise is proportional to the difference between the input vol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/156H02M1/08
CPCH02M1/08H02M3/156
Inventor 查振旭黄必亮周逊伟
Owner JOULWATT TECH INC LTD