Current limiting protection circuit
A current-limiting protection and current-limiting circuit technology, applied in the electronic field, can solve problems such as bus power failure, untimely power supply bus protection, and unrecoverable bus, and achieve the effect of protecting load equipment
Active Publication Date: 2017-04-26
SHENZHEN AEROSPACE NEW POWER TECH
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Problems solved by technology
[0002] The input terminals of domestic spacecraft load equipment currently adopt the traditional fuse or relay + fuse overcurrent protection mode. This method has the disadvantages that the bus cannot be restored and the protection of the power supply bus is not timely, which may easily cause the bus to "power down" instantly.
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[0022] like Figure 1-5 As shown, the present invention discloses a current limiting protection circuit, which includes a current sampling amplifier circuit and a current limiting circuit. The current sampling amplifier circuit includes a resistor R31, a resistor R32, a transistor V32, a resistor R33, a transistor V31B, a capacitor C11, and a transistor V31A, voltage regulator tube V33, resistor R7*, capacitor C12, resistor R35, resistor R36, one end of resistor R31 is connected to bus input terminal Vbus_in, the other end of resistor R31 is connected to the current limiting circuit, and one end of resistor R32 is connected to bus input terminal Vbus_in The other end of the resistor R32 is connected to the emitter of the transistor V32, one end of the resistor R33 is connected to the current limiting circuit, the other end of the resistor R33 is connected to the emitter of the transistor V31B, one end of the capacitor C11 is connected to the emitter of the transistor V31A, and ...
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The present invention provides a current limiting protection circuit. The current limiting protection circuit comprises a current sampling and amplifying circuit and a current limiting circuit; the current sampling and amplifying circuit includes a resistor R31, a resistor R32, a triode V32, a resistor R33, a triode V31B, a capacitor C11, a triode V31A, a voltage stabilizing tube V33, a resistor R7*, a capacitor C12, a resistor R35 and a resistor R36. According to the current limiting protection circuit of the invention, an MOSFET (metal-oxide-semiconductor field effect transistor) is adopted to switch on and switch off the input end bus-bar of a protection switch control device, when over-current or even a short-circuit fault occurs, the MOSFET can be switched off immediately, and over-current protection reaction time is at the microsecond level, and therefore, a load device can be effectively protected; and after the load device becomes normal, a boot instruction can be sent to the current limiting protection circuit, so that the current limiting protection circuit can operate again. The current limiting protection circuit is a recoverable over-current and short circuit protection product.
Description
technical field [0001] The invention relates to the field of electronic technology, in particular to a current limiting protection circuit. Background technique [0002] The input terminals of domestic spacecraft load equipment currently adopt the traditional fuse or relay + fuse overcurrent protection mode. This method has the disadvantages that the bus cannot be restored and the protection of the power supply bus is not timely, which may easily cause the bus to "power down" instantly. . Contents of the invention [0003] In order to solve the problems in the prior art, the present invention provides a current limiting protection circuit. [0004] The present invention provides a current limiting protection circuit, which includes a current sampling amplifier circuit and a current limiting circuit. The current sampling amplifier circuit includes a resistor R31, a resistor R32, a transistor V32, a resistor R33, a transistor V31B, a capacitor C11, a transistor V31A, Press...
Claims
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IPC IPC(8): H02H3/08H02H3/06
CPCH02H3/066H02H3/08
Inventor 张贤涛程航
Owner SHENZHEN AEROSPACE NEW POWER TECH