Control circuit, control method and flyback converter using same

A flyback converter and control circuit technology, applied in the direction of regulating electrical variables, control/regulating systems, high-efficiency power electronic conversion, etc., can solve the problems of large output capacitor voltage, ripple, large output voltage, etc.

Active Publication Date: 2017-05-31
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the control circuit stops working for a period of time (this will make the switch control signal Q remain inactive for a period of time), until the voltage drops below a predetermined value (such as figure 1 shown)
During this period, the output energy is provided by the output capacitor (usually an electrolytic capacitor) of the power stage circuit, and there is a large voltage ripple on the output capacitor, resulting in a large ripple on the output voltage

Method used

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  • Control circuit, control method and flyback converter using same
  • Control circuit, control method and flyback converter using same
  • Control circuit, control method and flyback converter using same

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Embodiment Construction

[0047] The present invention is described below based on examples, but the present invention is not limited to these examples. 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.

[0048] 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.

[0049]Meanwhile, it should be understood that in the following description, "circuit" refers to a conductive loop formed by at least one element or sub-circuit through electrical connection or electromagnetic connection. When an element or circuit is said to be "connected to" another elemen...

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Abstract

Disclosed are a control circuit, a control method and a flyback converter using the same. The present invention alternately adopts the pulse width modulation mode (that is, the constant switching frequency mode) and the constant on-time mode to control the power stage circuit according to the voltage compensation signal at light load, so that the output energy can be quickly and gently reduced without stopping the control circuit. , while improving the light-load efficiency of the flyback converter, the output voltage ripple is reduced.

Description

technical field [0001] The invention relates to power electronics technology, in particular to a control circuit, a control method and a flyback converter using the same. Background technique [0002] When the load is light, the conversion efficiency of the flyback converter will be very low. Therefore, in order to improve the efficiency, in the design of the flyback converter, the control method at light load is generally treated specially. [0003] In the prior art, generally when the load is light, a constant on-time control method is adopted. In this control mode, the conduction time of the switch control signal in each switching cycle is kept constant for a relatively long period of time relative to the switching cycle, and can be selected by the user. The switching frequency will vary (change the off-time) to provide the required output power. However, under light load conditions, the peak current decreases, the switching frequency decreases, and the losses related ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/24H02M1/14
CPCH02M1/143H02M3/24H02M1/15H02M3/33523Y02B70/10H02M1/14H02M3/33515H02M1/0032
Inventor 陈惠强
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD
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