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DC converter and its control circuit and method

A technology of DC converter and power switching circuit, which is applied in the direction of converting DC power input to DC power output, control/regulation systems, instruments, etc., which can solve the problems of sharp drop in output voltage and drop below the reference voltage, etc., to eliminate The overshoot of the output voltage and the effect of ensuring stability

Active Publication Date: 2018-12-11
CHENGDU MONOLITHIC POWER SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, when the load jumps, the output voltage will drop sharply and drop below the reference voltage in a short time

Method used

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  • DC converter and its control circuit and method
  • DC converter and its control circuit and method
  • DC converter and its control circuit and method

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Embodiment Construction

[0019] Specific embodiments of the present invention will be described in detail below, and it should be noted that the embodiments described here are only for illustration, not for limiting the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one of ordinary skill in the art that these specific details need not be employed to practice the present invention. In other instances, well-known circuits, materials or methods have not been described in detail in order to avoid obscuring the present invention.

[0020] Throughout this specification, reference to "one embodiment," "an embodiment," "an example," or "example" means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in the present invention. In at least one embodiment. Thus, appearances of the phrases "in on...

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Abstract

The application discloses a DC converter and its control circuit and method. The DC converter includes: a power switch circuit, receiving an input voltage, and providing an output voltage; a transient response unit, receiving a sampling signal representing a current flowing through the power switch circuit, and generating a transient current signal; a comparison circuit, receiving a reference voltage , The feedback voltage representing the output voltage, the slope compensation signal and the transient current signal generate a set signal; the logic control circuit receives the set signal and generates a switch control signal to control the operation of the power switch circuit. The DC converter eliminates the overshoot of the output voltage during the transient state of the system.

Description

technical field [0001] The present invention relates to an electronic circuit, more specifically, the present invention relates to a DC converter and its control circuit and method. Background technique [0002] Most electronic products, such as notebook computers, desktop computers, PDAs, etc., require a direct current (DC) power supply to provide regulated power to each functional module. The DC converter adopting constant on time control (constant on time, COT) has the advantages of fast transient response and simple structure, and has been widely used in the above fields. COT DC converters usually require slope compensation to stabilize the output voltage. [0003] In the prior art, the slope compensation signal has a fixed slope. When the main power switch of the converter is turned on, the slope compensation signal is reset to zero, and then rises with a fixed slope; when the output voltage drops to the sum of the slope compensation signal and the reference voltage, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/00H02M1/32
CPCH02M1/32H02M3/00H02M3/156H02M3/1566
Inventor 欧阳茜吴小康姜礼节
Owner CHENGDU MONOLITHIC POWER SYST