CN203218857U - 一种过压保护电路 - Google Patents

一种过压保护电路 Download PDF

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CN203218857U
CN203218857U CN 201320026048 CN201320026048U CN203218857U CN 203218857 U CN203218857 U CN 203218857U CN 201320026048 CN201320026048 CN 201320026048 CN 201320026048 U CN201320026048 U CN 201320026048U CN 203218857 U CN203218857 U CN 203218857U
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power supply
links
negative terminal
input power
divider resistance
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周厚明
李顶房
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WUHAN MAIWE OPTOELECTRONICS TECHNOLOGY Co Ltd
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WUHAN MAIWE OPTOELECTRONICS TECHNOLOGY Co Ltd
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Abstract

本实用新型公开了一种过压保护电路，包括MOS管Q1﹑可调分流基准电压源芯片U1，分压电阻R1﹑R2﹑R3﹑R4，限流电阻R5，其中：所述的MOS管Q1为N沟道MOS管，它的源极与输入电源负端相连，漏极与受保护的后级电路电源负端相连，栅极与分压电阻R1﹑R2的公共端相连；所述的分压电阻R1另一端与输入电源正端相连，电阻分压R2的另一端与输入电源负端相连；所述的可调分流基准电压源芯片U1，它的阴极与分压电阻R1﹑R2的公共端相连，阳极与输入电源负端相连，参考输入与限流电阻R5一端相连；所述的限流电阻R5另一端与分压电阻R3﹑R4的公共端相连；所述的分压电阻R3的另一端与电源正端相连，分压电阻R4的另一端与输入电源负端相连。

Description

一种过压保护电路
技术领域
本实用新型涉及了一种过压保护电路，具体涉及为低压直流电源供应领域。 
背景技术
在工业现场，连接到设备的供电线接头样式差不多，比如12﹑24﹑36V电源端子外形一致，在该情况下如果操作人员将36V电源接到12V设备上，那么12V设备很有可能会损坏。这就需要在设备里植入过压保护机制：当电压高于设备要求值时，该机制能迅速切断电源回路，直到输入电压回落到正常值范围才重新连接上回路。 
发明内容
本实用新型提供了一种过压保护电路，其创新在于不需要外接控制环节，只需要MOS管，可调分流基准电压源，普通电阻就可以实现过压保护功能。只要选择MOS管，电阻，可调分流基准电压源参数就可以应用在不同的电压场合。该电路具备结构简单，成本低廉，安全可靠等优点。 
一种过压保护电路，主要用来保护设备的后级电路防止过压造成的损坏，其特征在于：包括MOS管Q1﹑可调分流基准电压源芯片U1，分压电阻R1﹑R2﹑R3﹑R4，限流电阻R5。所述的MOS管Q1为N沟道MOS管，它的源极与输入电源负端相连，漏极与受保护的后级电路电源负端极相连，栅极与分压电阻R1﹑R2的公共端相连；所述的分压电阻R1另一端与输入电源正端相连，电阻分压R2的另一端与输入电源负端相连；所述的可调分流基准电压源芯片U1，它的阴极与分压电阻R1﹑R2的公共端相连，阳极与输入电源负端相连，参考输入与限流电阻R5一端相连；所述的限流电阻R5另一端与分压电阻R3﹑R4的公共端相连；所述的分压电阻R3的另一端与电源正端相连，分压电阻R4的另一端与输入电源负端相连。 
附图说明
附图1是过压保护电路结构图。 
具体实施方式
本实用新型包括MOS管Q1﹑可调分流基准电压源芯片U1，分压电阻R1﹑R2﹑R3﹑R4，限流电阻R5。所述的MOS管Q1为N沟道MOS管，它的源极与输入电源负端相连，漏极与受保护的后级电路电源负端极相连，栅极与分压电阻R1﹑R2的公共端相连；所述的分压电阻R1另一端与输入电源正端相连，电阻分压R2的另一端与输入电源负端相连；所述的可调分流基准电压源芯片U1，它的阴极与分压电阻R1﹑R2的公共端相连，阳极与输入电源负端相连，参考输入与限流电阻R5一端相连；所述的限流电阻R5另一端与分压电阻R3﹑R4的公共端相连；所述的分压电阻R3的另一端与电源正端相连，分压电阻R4的另一端与输入电源负端相连。 
可调分流基准电压源芯片U1的阴极和阳极之间正常情况下是高阻态，所以MOS管Q1的栅源极电压由分压电阻 R1﹑R2分压产生，当输入电压达到一定数值，使得MOS管Q1的栅源极电压大于其门槛电压， MOS管Q1导通，此时输入电源负端和后级电路电源负端连接在一起，此时电路正常工作。当输入电压达到一定数值，使得分压电阻R3﹑R4公共端的电压大于可调分流基准电压源芯片U1内部基准电压时，可调分流基准电压源芯片U1的阴极和阳极就会导通，该情况下相当于 MOS管Q1的栅极与输入电源负端相连,此时MOS管Q1的栅源极电压为0， MOS管Q1截止，即输入电源负端和后级电路电源负端隔断，这就实现了过压保护功能。 

Claims (1)

1.一种过压保护电路，主要用来保护设备的后级电路防止过压造成的损坏，其特征在于：包括MOS管Q1﹑可调分流基准电压源芯片U1，分压电阻R1﹑R2﹑R3﹑R4，限流电阻R5 ，其中：所述的MOS管Q1为N沟道MOS管，它的源极与输入电源负端相连，漏极与受保护的后级电路电源负端相连，栅极与分压电阻R1﹑R2的公共端相连；所述的分压电阻R1另一端与输入电源正端相连，电阻分压R2的另一端与输入电源负端相连；所述的可调分流基准电压源芯片U1，它的阴极与分压电阻R1﹑R2的公共端相连，阳极与输入电源负端相连，参考输入与限流电阻R5一端相连；所述的限流电阻R5另一端与分压电阻R3﹑R4的公共端相连；所述的分压电阻R3的另一端与电源正端相连，分压电阻R4的另一端与输入电源负端相连。
CN 201320026048 2013-01-18 2013-01-18 一种过压保护电路 Expired - Fee Related CN203218857U (zh)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105305822A (zh) * 2015-10-31 2016-02-03 广东新昇电业科技股份有限公司 具有短路保护功能的稳压电路
CN108199353A (zh) * 2017-12-26 2018-06-22 惠州市德赛西威汽车电子股份有限公司 一种外部接口保护电路

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105305822A (zh) * 2015-10-31 2016-02-03 广东新昇电业科技股份有限公司 具有短路保护功能的稳压电路
CN105305822B (zh) * 2015-10-31 2018-08-10 广东新昇电业科技股份有限公司 一种具有短路保护功能的直流稳压电路
CN108199353A (zh) * 2017-12-26 2018-06-22 惠州市德赛西威汽车电子股份有限公司 一种外部接口保护电路

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