Control circuit, switching mode convertor and control method

A switching mode, control circuit technology, applied in the direction of regulating electrical variables, control/regulating systems, converting DC power input to DC power output, etc., can solve problems such as large overshoot, and achieve the effect of eliminating output voltage overshoot

Active Publication Date: 2012-11-28
CHENGDU MONOLITHIC POWER SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the output voltage VO increases to the preset output reference voltage value DVO, the inductor current IL is much larger than the load current IO, and the energy stored in the inductor is transferred to the output voltage VO, causing the output voltage VO to be much higher than the preset value. Set the output reference voltage value DVO, resulting in a large overshoot

Method used

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  • Control circuit, switching mode convertor and control method
  • Control circuit, switching mode convertor and control method
  • Control circuit, switching mode convertor and control method

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Embodiment Construction

[0026] 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.

[0027] 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 invention discloses a control circuit, a switching mode convertor and a control method. The switching mode convertor comprises a first switching tube; a control circuit controls the connection and the disconnection of the first switching tube so as to the value of an output voltage of the switching mode convertor to be equal to a presupposed output reference voltage value; and when the output voltage of the switching mode convertor is greater than a first threshold voltage, the control circuit carries out disconnection on the first switching tube and at least a certain period of disconnection time is maintained, the overshoot of the output voltage is reduced, and the value of the first threshold voltage is less than the presupposed output reference voltage value.

Description

technical field [0001] The present invention mainly relates to an electronic circuit, in particular to a control circuit for a switch-mode converter and a control method thereof. 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, such as a supply voltage, to each functional module. With the development of electronic technology, the power supply usually requires a faster load transient response speed. However, the load transient response speed is too fast, which is likely to cause new problems, such as a large overshoot of the output voltage when the load is jumping, that is, the output voltage rebound. [0003] Such as figure 1 As shown, taking the DC step-down converter controlled by constant on-time as an example, at time T0, the load current IO jumps forward at a relatively fast speed, resulting in a rapid decrease in the output voltage ...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H02M1/08H02M3/155
CPCH02M3/156H02M3/158
Inventor欧阳茜
OwnerCHENGDU MONOLITHIC POWER SYST