The invention provides a protection circuit (100) for preventing reverse connection of a power supply, which can be turned off in time when the power supply is reversely connected, is low in power consumption and small in heat dissipation, and does not need to be provided with an additional power supply. The power supply anti-reverse-connection module (4) is connected between a power supply (1) and a load (6); the power supply anti-reverse-connection module (4) comprises a first N-channel field effect transistor (41) and an anti-reverse-connection discharging circuit (42), when the power supply (1) is positively connected, the booster circuit module (3) applies voltage to a grid electrode of the first N-channel field effect transistor (41) to conduct the first N-channel field effect transistor (41), so that the power supply (1) and the load (6) are connected, and when the power supply (1) is reversely connected, the anti-reverse-connection discharging circuit (42) discharges the first N-channel field effect transistor (41). The anti-reverse-connection discharging circuit (42) enables the voltage of the output end of the booster circuit module (3) to be released in the direction of the power supply (1) and not to be applied to the grid electrode of the first N-channel field effect transistor (41), so that the first N-channel field effect transistor (41) is cut off, and the power supply (1) and the load (6) are disconnected.
本发明提供一种防电源反接保护电路(100),能够在电源反接时及时关断电路,低功耗且散热小,并无需设置额外电源等。其包括:连接在电源(1)与负载(6)之间的电源防反接模块(4);以及升压电路模块(3),电源防反接模块(4)包括第一N沟道场效应管(41)和防反接放电电路(42),当电源(1)正接时,升压电路模块(3)向第一N沟道场效应管(41)的栅极施加电压使其导通,从而接通电源(1)与负载(6),当电源(1)反接时,防反接放电电路(42)使得升压电路模块(3)的输出端的电压向电源(1)的方向释放而不施加到第一N沟道场效应管(41)的栅极,从而第一N沟道场效应管(41)截止,电源(1)与负载(6)之间断路。
Protection circuit for preventing reverse connection of power supply
防电源反接保护电路
2022-07-26
Patent
Electronic Resource
Chinese
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