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Control circuit, control method and switching power supply using same

A technology of a control circuit and a control method, applied in the field of power electronics, can solve problems such as low stability, and achieve the effects of reducing ontime time, output current ripple, and voltage ripple

Active Publication Date: 2021-10-15
NANJING SILERGY SEMICON TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of this, the present invention provides a control circuit and control method to solve the existing problem of low stability at light load

Method used

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

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Embodiment Construction

[0042] 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.

[0043] 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.

[0044] 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 eleme...

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Abstract

The invention discloses a control circuit and a control method. Through closed-loop operation under normal load, the current loop is disconnected when the bandwidth of the current loop has not been significantly reduced under light load, thereby avoiding the current loop and the voltage loop. problem of mutual interference. And by reducing the ontime time and reducing the frequency, the output current ripple and voltage ripple are reduced accordingly.

Description

technical field [0001] The present invention relates to a power electronic technology, more specifically, to a control circuit, a control method and a switching power supply using the same. Background technique [0002] In the prior art, the basic principle of the average current mode control is to obtain a voltage compensation signal according to the output voltage feedback signal and the voltage reference signal, so that the voltage compensation signal is compared with the sampling signal of the average value of the inductor current to obtain the current compensation signal. The current compensation signal is compared with a ramp signal to obtain a control signal. That is, double-loop control is adopted: current inner loop and voltage outer loop. When designing, the bandwidth of the current inner loop is much higher than the bandwidth of the voltage outer loop to ensure sufficient phase margin. However, at light loads, since the operating frequency will decrease as the l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/00H02M1/08H02M1/088
CPCH02M1/00H02M1/08H02M1/088H02M1/0016H02M1/0003H02M1/0025H02M3/158H02M1/0032H02M1/15Y02B70/10H02M3/156H02M3/33507
Inventor 张锐程帅
Owner NANJING SILERGY SEMICON TECH CO LTD