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DC-DC converter and overcurrent protection circuit thereof

An overcurrent protection circuit, DC-DC technology, applied in emergency protection circuit devices, conversion of DC power input to DC power output, instruments, etc. Low cost and strong anti-interference ability

Pending Publication Date: 2021-06-25
国网河北省电力有限公司雄安新区供电公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a DC-DC converter and its overcurrent protection circuit to solve the problem that the cost and anti-interference ability of the current DC-DC converter cannot be balanced

Method used

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  • DC-DC converter and overcurrent protection circuit thereof
  • DC-DC converter and overcurrent protection circuit thereof

Examples

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Embodiment Construction

[0021] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] Example of DC-DC converter

[0023] The DC-DC converter of the present invention is like figure 1 As shown, including the DC power source 1, the current limit unit 2, the input filter capacitor 5, the half bridge converter 6, the filter inductor 9, and the output filter capacitor 10, wherein the current stream unit 2 includes parallel contactor 3 and a current limiting resistor 4, The power supply is connected to the half bridge converter 6 through the current limiting unit 2, and there is a input filter capacitor 5 between the current limiting unit 2 and the half bridge converter 6 for filtering the power supply; half bridge converter includes a first IGBT 7 and second IGBT 8, the first IGBT 7 and the second IGBT 8 constitute a half-bridge structure to voltage conversion, the output of the half bridge converter connects the resistance load by filtering inductance 9 and the output filter capacitor 10, which is a res...

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PUM

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Abstract

The invention relates to a DC-DC converter and an overcurrent protection circuit thereof, which belong to the technical field of low-voltage power distribution networks and power electronics. The overcurrent protection circuit can accurately detect the change condition of the load current, the first triode is controlled to be switched on under the condition of overcurrent of the load current, after the first triode is switched on, the collector of the first triode is changed into low level to enable the second triode to be switched on, VCC is loaded to the base of the first triode through the collector of the second triode, self-locking is formed, and the power supply of the DC-DC converter can be safely and stably cut off during overcurrent. Overcurrent protection is achieved through the driving and self-locking circuit composed of the two triodes, the cost is low, and the anti-interference capacity is high.

Description

Technical field [0001] The present invention relates to a DC-DC converter and its overcurrent protection circuit, belonging to the field of low voltage distribution and power electronics technology. Background technique [0002] In recent years, with the rapid development of electricity electronics and electronic technology, DC-DC converters have been more widely used in computer, communications, industrial automation, electronic or electrical instruments. In the DC-DC converter, high-power MOSFET tubes also have updated breakthroughs in technology and applications, and the pressure drop is getting lower and faster, and the switching speed is getting faster, and it is widely used by its excellent high-frequency switching characteristics. However, the MOSFET switch tube has a weaker ability to overload, and the power generated by the power supply, the internal short circuit is abnormal, which affects the normal operation of the MOSFET switch tube, and may have permanent Damage. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/12H02M3/155H02M1/14
CPCH02H7/1213H02M3/155H02M1/14
Inventor 侯磊马慧卓张茂鹏苏阳唐凡张永新陈星宇
Owner 国网河北省电力有限公司雄安新区供电公司
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