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A buck converter with adaptive on-time control

An on-time and off-time control technology, which is used in control/regulation systems, output power conversion devices, conversion of DC power input to DC power output, etc., can solve the problem of low output accuracy, unstable switching frequency, transient The problem of low transient response speed, etc., achieves the effect of high transient response speed, stable switching frequency and fast response.

Active Publication Date: 2022-06-07
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, there are many problems that need to be solved urgently in the existing hybrid control mode, including low output accuracy, low transient response speed, and unstable switching frequency under continuous conduction mode.

Method used

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  • A buck converter with adaptive on-time control
  • A buck converter with adaptive on-time control
  • A buck converter with adaptive on-time control

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Embodiment Construction

[0046] The present invention will be described in further detail below with reference to specific embodiments, but the embodiments of the present invention are not limited thereto.

[0047] In order to improve the transient response speed, output accuracy, and switching frequency stability of the Buck converter in continuous conduction mode, an embodiment of the present invention provides a Buck converter with adaptive on-time control, such as figure 1 As shown, the Buck converter with adaptive on-time control includes: a DC power supply 10 , a Buck main power stage circuit 20 , an RC sampling circuit 30 , an adaptive on-time generating circuit 50 and a control circuit 40 .

[0048] Among them, the DC power supply 10 is used to provide the input voltage for the Buck converter.

[0049] The Buck main power stage circuit 20 is used to step down the input voltage to obtain the output voltage.

[0050] figure 2 The circuit structure of the Buck main power stage circuit 20 is ex...

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Abstract

The invention discloses a Buck converter with adaptive conduction time control, comprising: a DC power supply, used to provide an input voltage; a Buck main power stage circuit, used to step down the input voltage to obtain an output voltage; RC sampling The circuit is used to sample the inductor current and the output voltage to obtain the sampling voltage; the control circuit is used to generate the on-time control signal according to the sampling voltage and the feedback voltage; the adaptive on-time generation circuit is used to generate the on-time control signal according to the sampling voltage and the input Voltage, cooperates with the control circuit to generate the off-time control signal; the control circuit is also used to generate and control the turn-on and turn-off of the two power transistors in the Buck main power stage circuit according to the on-time control signal and the off-time control signal switch control signal. The Buck converter provided by the present invention has high transient response speed, high output precision, and relatively stable switching frequency in continuous conduction mode.

Description

technical field [0001] The invention belongs to the field of power management chips, and in particular relates to a Buck converter with adaptive on-time control. Background technique [0002] With the advancement of integrated circuit technology, various electronic products continue to emerge. As an indispensable part of electronic products, power supply, its performance and reliability will affect the quality of the entire electronic equipment. Among them, switching power supplies are widely used in various fields of portable equipment, electronic computers, communications and home appliances due to their high conversion efficiency and strong load capacity. [0003] For the switching power supply, the load change range is large in actual work, and the change rate of the load current is high, which requires the Buck converter of the switching power supply to have a fast transient response speed to meet the power supply demand for the load. , to ensure the stable operation ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/158H02M1/08
CPCH02M3/158H02M1/08Y02B70/10
Inventor 柴常春姜婵荣杨毅周伟雄江帆陈壮梁
Owner XIDIAN UNIV