Loop compensation method and circuit

A loop compensation and circuit technology, applied in the direction of electrical components, high-efficiency power electronic conversion, output power conversion devices, etc., can solve the problems of unfavorable system dynamic characteristics and difficulty in integration, so as to improve dynamic characteristics, realize dynamic zero point and Effect of pole compensation

Active Publication Date: 2015-11-18
MORNSUN GUANGZHOU SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] It can be seen from Table 2 that even if the resistance is enlarged nearly 44 times, the capacitance C 1 It can only be r

Method used

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Examples

Experimental program
Comparison scheme
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Example Embodiment

[0083] Example 1

[0084] Such as image 3 Shown is a schematic diagram of the control circuit of the primary side feedback application of the controller using the loop compensation circuit of the present invention, the input voltage V IN The positive pole of the transformer passes through the primary winding N P Connected to the drain of the main power switch SW, the source of the main power switch SW passes through a resistor R CS And input voltage V IN The negative pole of the main power switch SW is connected (also referred to as "ground"), the source of the main power switch SW is also connected to the current sensing pin of the controller 100, and the gate of the main power switch SW is connected to the drive signal output by the controller 100; Transformer secondary winding N S After passing through the anode and cathode of the rectifier diode D in turn, connect in parallel to the output capacitor C OUT Both ends of the output capacitor C OUT A dummy load R is also conn...

Example Embodiment

[0102] Example 2

[0103] Image 6 Shows a simplified schematic diagram of the control part of the controller 200 integrated with the loop compensation circuit of the present invention in the secondary side feedback flyback converter, and image 3 Similarly, some circuits not related to loop control are omitted. Such as Image 6 As shown, the input voltage V IN The positive pole of the transformer passes through the primary winding N P Connected to the drain of the main power switch SW, the source of the main power switch SW passes through a resistor R CS And input voltage V IN The source of the main power switch SW is also connected to the current sensing pin of the controller 200, and the gate of the main power switch SW is connected to the drive signal output by the controller 200; the transformer secondary winding N S Pass the anode and cathode of the rectifier diode D in parallel with the output capacitor C OUT Both ends of the output capacitor C OUT A dummy load R is als...

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Abstract

The present invention discloses a loop compensation method. The method includes the following steps that: a switching circuit receives error amplification signals outputted by a switching power source feedback network and outputs the error amplification signals to a lag compensation circuit under the control of a control signal with a predetermined duty ratio; the lag compensation circuit generates compensated signals and transmits the compensated signals to a sampling circuit; and the sampling circuit receives the compensated signals and transmits the compensated signals to a duty ratio control circuit of a switching power source main power switching tube under the control of the other control signal with a predetermined duty ratio. With the loop compensation method of the invention adopted, control circuits can be wholly integrated in control devices, and therefore, the number of peripheral components can be decreased, and power source cost can be decreased, and at the same time, the compensated signals can be stored completely, and therefore, the distortion of the compensated signals when the switching circuit is switched off can be avoided. The invention also discloses a loop compensation circuit corresponding to the above method.

Description

technical field [0001] The invention relates to a loop compensation method and circuit, which are suitable for application in the field of switching converters. Background technique [0002] Switching converters (also known as switching power supplies) generally use a negative feedback control loop to keep the output voltage of the converter stable. However, as with any negative feedback system, there is a problem of loop stability. The stability of the control system is determined by the system structure, because the control system generally contains energy storage components and inertial components, such as capacitors and inductors. Because the energy of this type of component cannot change suddenly, when the system is disturbed or has input, the control process will not be completed immediately, but there will be a certain delay. If this delay causes the feedback signal to be added to the original disturbance or input in phase signal, the system will oscillate. If the ...

Claims

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Application Information

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IPC IPC(8): H02M1/42
CPCY02B70/10
Inventor 唐盛斌符威赵志伟
Owner MORNSUN GUANGZHOU SCI & TECH
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