Method for eliminating current overshoot and switching circuit

A technology for switching circuits and currents, which is applied in the field of methods and switching circuits to eliminate current overshoots, can solve problems such as system reliability damage and current overshoots, and achieve the effects of improving service life, small damage, and eliminating current overshoots

Pending Publication Date: 2020-09-11
MAXIC TECHNOLOGY CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method and a switch circuit for eliminating current overshoot, aiming at solving the problem that current overshoot is easily caused when the existing switching power supply system is powered on again during the power-off process, causing damage to the reliability of the system technical issues

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  • Method for eliminating current overshoot and switching circuit
  • Method for eliminating current overshoot and switching circuit
  • Method for eliminating current overshoot and switching circuit

Examples

Experimental program
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Effect test

Embodiment 1

[0049] Such as Figure 5 , a method for eliminating current overshoot provided by the present invention comprises the following steps:

[0050] Determine whether the system enters the power-down state;

[0051]When the system enters the power-off state, the power-off protection device is activated, and the power-off timer starts to record the power-off time;

[0052] When the power-off time reaches a preset time, the integrator starts reverse integration, wherein the preset time is longer than the cycle time of the bus voltage VM.

[0053] Due to the power-off, the bus voltage drops, which makes the voltage of the sampling resistor drop, which in turn causes V ref and V fb As the difference increases, the integrator produces an error signal V comp will increase, causing the driver to generate a PWM signal that exceeds the steady-state value, and the output current I L Increasing the current beyond the steady state creates an overshoot.

[0054] Therefore, in this embodim...

Embodiment 11

[0058] On the basis of Embodiment 1, further optimization is made in this embodiment. Such as Figure 5 , a method for eliminating current overshoot provided by the present invention comprises the following steps:

[0059] Determine whether the system enters the power-down state;

[0060] When the system enters the power-off state, the power-off protection device is activated, and the power-off timer starts to record the power-off time;

[0061] When the power-off time reaches a preset time, the integrator starts reverse integration, wherein the preset time is longer than the cycle time of the bus voltage VM.

[0062] Due to the power-off, the bus voltage drops, which makes the voltage of the sampling resistor drop, which in turn causes V ref and V fb As the difference increases, the integrator produces an error signal V comp will increase, causing the driver to generate a PWM signal that exceeds the steady-state value, and the output current I L Increasing the current b...

Embodiment 2

[0069] Such as Figure 7 As shown, a method for eliminating current overshoot includes the following steps:

[0070] Obtain the bus voltage parameters, when the bus voltage is less than the power-off threshold voltage V PL , and the bus voltage continues to drop (such as Figure 6 As shown), at this time, it is determined that the system has entered a power-off state.

[0071] Start the power-down protection device, and the power-down timer starts to record the power-down time;

[0072] When the power-off time reaches a preset time, the integrator performs reverse integration, wherein the preset time is longer than the cycle time of the bus voltage VM.

[0073] When the reverse integration time of the integrator reaches, that is, when the reverse integration reaches 2, the integrator stops integrating until the system is powered on next time. The same reverse integration time can be any moment in Embodiment 1 to 2, and can also be greater than 2.

[0074] Due to the power...

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Abstract

The invention provides a method for eliminating current overshoot and a switching circuit, belongs to the field of switching power supplies, and the method comprises the following steps: judging whether a system enters a power-down state or not; if the system enters the power-down state, starting a power-down protection device; and when the power-down time reaches the preset time and the preset time is greater than the period time of the bus voltage VM, enabling the integrator to carry out reverse integration. According to the method for eliminating the current overshoot, provided by the invention, the signal rise of the error signal Vcomp is limited, and the current overshoot is also limited after the system is electrified again, so that the phenomenon of output current overshoot can be greatly reduced.

Description

technical field [0001] The invention belongs to the field of switching power supplies, and more specifically relates to a method for eliminating current overshoot and a switching circuit. Background technique [0002] In the design and implementation of switching power supply circuits, the integral loop is a common circuit (such as figure 1 , figure 2 ). refer to figure 1 , after the mains passes through the rectifier bridge, it outputs a DC signal VM (bus voltage) to provide energy for the switching power supply. A switching power supply consists of an error amplifier (EA), a driver, a switching network, a feedback circuit, etc. The feedback circuit samples the output voltage or current and other electrical parameters to obtain a feedback signal V fb , and then fed back to an input of the error amplifier (such as the inverting input), and the set reference potential V ref Compare and amplify, and output an error signal V at the output of EA comp . When the feedback...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K17/08H02M1/32
CPCH02M1/32H03K17/08
Inventor 闫志光刘柳胜
Owner MAXIC TECHNOLOGY CORPORATION
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