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Soft start/stop DC switch power supply

A DC switch, soft start-stop technology, applied in the direction of DC power input conversion to DC power output, electrical components, circuit devices, etc., can solve the problems of power consumption, inrush current limitation, low power supply efficiency, etc., to eliminate extra loss, Reduce inrush current and design flexibility

Inactive Publication Date: 2008-08-06
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, to realize soft start of DC switching power supply, a soft start circuit is usually specially designed between the uncontrollable rectification part and the DC-to-DC converter part. The most common simple form is series resistance, which mainly depends on the resistor to limit the peak value of the input surge current, but at the same time, a certain amount of power will be consumed on the resistor
Therefore, the traditional soft-start circuit introduces additional losses, resulting in inefficient power supply
Moreover, the existing DC switching power supply does not limit the inrush current caused by the sudden change of the capacitor voltage during the power-off process (or called the stop process).

Method used

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  • Soft start/stop DC switch power supply
  • Soft start/stop DC switch power supply
  • Soft start/stop DC switch power supply

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0076] Further illustrate below in conjunction with accompanying drawing and embodiment:

[0077] 1. Selection of soft start and stop DC switching power supply function blocks

[0078] 1. EMI filter 1

[0079] EMI filter 1 selects the EMI filter of model ZJG2206M-P;

[0080] 2. Uncontrolled rectification 2

[0081] Uncontrolled rectification 2 uses KBL06 rectification module;

[0082] 3. DC / DC Converter 3

[0083] The DC / DC converter 3 adopts a step-up DC / DC converter, that is, a Boost converter, and the core power MOSFET is IRF840 from International Rectification Company (IR Company for short);

[0084] 4. Detection and conditioning circuit 4

[0085] The detection and conditioning circuit 4 selects LV25-P and LA25-P of Swiss LEM Company as voltage and current sensors respectively;

[0086] 5. Drive circuit 5

[0087] The driving circuit 5 adopts IR2117 from IR Company, which is a high-voltage and high-speed power MOSFET driving chip.

[0088] 6. Controller 6

[0089...

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PUM

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Abstract

The disclosed dc soft on-off switch power comprises: an EMI filter 1, a non-control rectifier 2, a DC / DC converter 3, a detecting and regulating circuit 4, a drive circuit 5, and a controller 6 that composes by a mean calculation module A, a reciprocal-value calculation module B, a voltage / current PI controller C / D, a PWM module E, a first / second / third A / D (F / G / H), a first / second multiplier I / J, and a first / second comparator K / L. this invention uses CPU to control program and inhibit surge current, reduces extra loss and cost, and has wide application.

Description

technical field [0001] The invention relates to a DC switching power supply and a control method thereof, in particular to a method for soft starting and stopping of a DC switching power supply based on digital control. Background technique [0002] The DC switching power supply directly powered by the grid, most of the application occasions are high input voltage, large input filter and output filter capacitance, will generate a very large surge current at the moment of connecting to the grid, which will not only damage the bridge rectifier Diodes, melting switch contacts, will also saturate high-frequency transformers and damage power switch tubes. The soft-start circuit can reduce the charging current of the capacitor and effectively prevent the maximum peak value of the inrush current. [0003] At present, to realize soft start of DC switching power supply, a soft start circuit is usually specially designed between the uncontrollable rectification part and the DC-to-DC ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/00H02H9/04
Inventor 刘开培曾光
Owner WUHAN UNIV