Input/output protection circuit
A technology of input and output protection and circuits, which is applied in the direction of emergency protection circuit devices, circuit devices, emergency protection devices with automatic disconnection, etc., can solve the problems of multi-PCB board area, circuit device damage and occupation at the output end of the circuit, and avoid The effect of excessive power, solving the damage of circuit devices and occupying more PCB board area
Pending Publication Date: 2021-11-02
SUZHOU EAVISION ROBOTIC TECH CO LTD
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Problems solved by technology
[0005] The purpose of the present invention is to disclose an input and output protection circuit, which solves the problem in the prior art that the circuit device is damaged due to an abnormality at the output end of the circuit and occupies a large area of the PCB board.
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[0030] The present invention will be described in detail below in conjunction with the implementations shown in the drawings, but it should be noted that these implementations are not limitations of the present invention, and those of ordinary skill in the art based on the functions, methods, or structural changes made by these implementations Equivalent transformations or substitutions all fall within the protection scope of the present invention.
[0031] Such as figure 1 As shown, the present embodiment provides an input-output protection system, which includes: an input-output protection circuit 100; a control unit 200 (ie, an internal circuit on a PCB board, such as MCU and other chips that need to output digital information); and, the external communication circuit 300 connected to the output end (ie Output end) of the input and output protection circuit 100 can specifically be directly connected to the external communication cable through a connector on the PCB board. ...
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The invention provides an input and output protection circuit which comprises a first switching device and a second switching device which are respectively provided with three electrodes, the third electrode of the first switching device is connected with the first electrode of the second switching device, and a feedback circuit is arranged between the first electrode of the first switching device and the third electrode of the second switching device; the third electrode of the second switching device is connected to a power supply through an anti-backflow circuit, and the third electrode of the first switching device is connected to the power supply through a system resistor; a bias resistor is connected between the first electrode and the second electrode of the first switching device, and the input end is connected to the first electrode of the first switching device through a current-limiting resistor; a turn-off voltage is arranged between the third electrode and the second electrode of the second switching device, and the turn-off voltage is determined based on the bias resistor, the current-limiting resistor and the feedback circuit. The problems that in the prior art, due to the fact that the output end of the circuit is abnormal, circuit devices are damaged, and a large area of a PCB is occupied are solved.
Description
technical field [0001] The invention relates to the technical field of protection circuits, in particular to an input and output protection circuit. Background technique [0002] The protection of communication lines between boards or modules is often involved in circuit design. For example, if the cable connected to the circuit accidentally short-circuits to the power line or short-circuits to the ground wire, how to protect the circuit from damage is a problem that needs to be considered in the circuit design process. [0003] To solve this technical problem, a protection circuit is usually designed to isolate external abnormalities from the core components on the circuit board. However, if the abnormal voltage is relatively high, usually the volume of the protective device in the circuit will be relatively large. In this way, the area occupied by the PCB board is large and the area on the PCB board is wasted. Moreover, as more protection circuits are designed on the PCB...
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IPC IPC(8): H02H3/10H02H3/16
CPCH02H3/105
Inventor 崔豫川庞棋峰宋红军
Owner SUZHOU EAVISION ROBOTIC TECH CO LTD