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Control circuit, switching power supply and control method

A control circuit, switch-type technology, applied in control/regulating systems, electrical components, regulating electrical variables, etc., can solve the problems of difficult to achieve frequency control, on-time calculation errors, changes, etc., to improve control accuracy, frequency Control precise effects

Inactive Publication Date: 2014-10-01
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the calculation error of the conduction time itself, and under different input and output conditions, different loads will cause changes in the duty cycle of the switching system in the switching converter. Therefore, the existing control circuit is difficult to obtain Precise switching period, making precise frequency control difficult to achieve

Method used

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  • Control circuit, switching power supply and control method
  • Control circuit, switching power supply and control method
  • Control circuit, switching power supply and control method

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Embodiment Construction

[0056] Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. Although the invention is described in connection with the following preferred embodiments, the invention is not limited to these embodiments. In the following detailed description of the invention, some specific details are set forth in detail. The present invention can be fully understood by those skilled in the art without the description of these detailed parts. In order not to obscure the essence of the present invention, well-known methods, procedures, procedures, components and circuits have not been described in detail.

[0057] Additionally, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

[0058]Meanwhile, it should be understood that in the following description, "circuit" refers to a conductive loop formed by at least one ele...

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Abstract

The invention discloses a control circuit, a switching power supply and a control method. The control circuit is used for controlling a switching converter and comprises a status acquisition circuit and a control signal generation circuit. The status acquisition circuit is used for generating an error amplifying signal according to a feedback voltage and a reference voltage, carrying out slope compensation on the error amplifying signal through a slope compensation signal with a preset frequency, and comparing the error amplifying signal which has undergone slope compensation with a voltage ripple to output a status signal, wherein the voltage ripple changes synchronously with the current of an energy storage element of the switching converter. The control signal generation circuit is used for outputting a switching control signal according to the status signal to control the switching converter, wherein the switching control signal has the preset frequency. By carrying out fixed-frequency control with the voltage ripple changing synchronously with the current of the energy storage element of the switching converter as the parameter, the control accuracy of the switching converter is improved, and frequency control is more accurate.

Description

technical field [0001] The invention relates to power electronics technology, in particular to a control circuit, a switching power supply and a control method. Background technique [0002] A switching power supply usually includes a power stage circuit and a control circuit. The function of the control circuit is to adjust the turn-on and turn-off time of the switching system in the switching converter when the input voltage, internal parameters and external load change, so as to keep the output voltage or output current of the switching power supply constant. Therefore, in the design of the switching power supply, the selection and design of the control method are very important for the performance of the switching power supply. Using different detection signals and different control circuits will have different control effects. [0003] Power stage circuits are usually implemented using switching converters. In the prior art, the control circuit for controlling the sw...

Claims

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Application Information

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IPC IPC(8): H02M3/155
CPCH02M3/158H02M1/0025H02M3/1566
Inventor 杭开郎罗九兵
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD
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