Switching power converter system and control method thereof

A power converter, switching power supply technology, applied in the field of circuits, can solve the problems of weakened anti-interference ability, reduced control accuracy, damage to load life, etc., to achieve high transient response performance, reduce ripple, and eliminate deviations.

Inactive Publication Date: 2015-05-13
王锴
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ripple on the feedback voltage depends on the output voltage
When the ripple of the output voltage is small, the ripple on the feedback voltage is also small, which will cause problems such as slow transient response, reduced control accuracy, and weakened anti-interference ability.
And when the ripple of the output voltage is large, it will cause damage to the load life

Method used

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  • Switching power converter system and control method thereof
  • Switching power converter system and control method thereof
  • Switching power converter system and control method thereof

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Embodiment Construction

[0021] The specific embodiments described below represent exemplary embodiments of the invention and are merely illustrative rather than limiting in nature. In the specification, reference to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. The appearances of the term "in one embodiment" in various places in the specification are not all referring to the same embodiment, nor are they intended to mutually exclude other or alternative embodiments. All features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any manner, except for mutually exclusive features and / or steps.

[0022] Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Like reference numerals refer to like parts or features throughout the...

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PUM

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Abstract

The invention provides a switching power converter system. The system consists of a switching power converter, a feedback circuit, an error amplifying circuit, a first RC network, a ripple generating circuit and a constant on-time control circuit. The error amplifying circuit forms an error amplifying signal according to a feedback signal and a reference signal and simultaneously forms a basis signal; the first RC network converts the error amplifying signal into an error integral signal. The ripple generating circuit generates a ripple signal, and superposes the ripple signal with the basis signal to generate a comparison signal. The error integral signal is compared with the comparison signal to generate a constant on-time control signal to control the switching power converter system, so that the switching power converter system is smaller in output ripples, and higher in transient response.

Description

technical field [0001] The invention relates to the field of circuits. The present invention relates more particularly but not exclusively to switching power converter systems and control methods. Background technique [0002] In the field of switching power supply, the switching power converter system with constant on-time control mode has been widely used in the industry due to its superior load transient response, simple internal structure and smooth operation mode switching. [0003] The constant on-time switching power converter in the prior art usually uses the ripple on the feedback voltage for comparison to trigger an internal timer to complete the setting of the constant on-time. However, the ripple on the feedback voltage depends on the output voltage. When the ripple of the output voltage is small, the ripple on the feedback voltage is also small, which will cause problems such as slow transient response, reduced control accuracy, and weakened anti-interference ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/155
CPCH02M3/155H02M1/14
Inventor 王锴
Owner 王锴
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