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A quasi-resonant control switching circuit and method

A technology of switching power supply circuit and switching voltage, applied in the direction of control/regulation system, electrical components, regulating electric variables, etc., can solve the problems of audio noise, switching power supply output power discontinuity, etc., to avoid audio noise, switching frequency and current The effect of peak stabilization

Active Publication Date: 2019-06-18
CHENGDU MONOLITHIC POWER SYST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the opening of the valley bottom will cause the output power of the switching power supply to be discontinuous. After the loop adjustment, the switching frequency will jump within a few switching cycles, which will cause audio noise.

Method used

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  • A quasi-resonant control switching circuit and method
  • A quasi-resonant control switching circuit and method
  • A quasi-resonant control switching circuit and 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 quasi-resonant control switching power supply circuit and a method thereof, which can prevent the generation of audio noise by adjusting the corresponding relationship between the peak value of the current and the switching frequency. Its circuit includes: an energy storage element capable of storing energy; a switch electrically coupled to the energy storage element, the energy storage element stores energy when the switch is turned on, and the energy storage element stores energy when the switch is turned off The energy stored in the component is transferred to the load; the valley detection circuit detects whether the switching voltage across the switch is lower than the valley reference signal; the mode detection circuit detects whether the switching power supply circuit is operating in continuous current mode; and the peak signal adjustment circuit meets the Adjust the peak signal value for discontinuous current mode and non-valley conduction conditions.

Description

technical field [0001] The present invention relates to a switching power supply, in particular, to the quasi-resonant control of the switching power supply. Background technique [0002] Switching power supplies usually use transformers or inductors as energy storage elements. For example, a transformer is used as an energy storage element in a flyback converter. A switch is electrically coupled to the primary side of the transformer. The control circuit controls the switch to be turned on and off, so that energy is alternately stored in the transformer or transferred to the secondary side of the transformer. The secondary side of the transformer generates an output voltage at both ends of the output capacitor through the filter, and the output voltage is the DC output voltage of the flyback converter. The increase and decrease of the DC output voltage are opposite to the power delivered to the load. The increase of the load will cause the DC output voltage to decrease, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335H02M7/48
CPCH02M3/33523H02M7/48H02M7/4818H02M3/33507H02M1/0009H02M1/0025H02M1/0058Y02B70/10H02M1/08H02M1/0054
Inventor 王斯然
Owner CHENGDU MONOLITHIC POWER SYST
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