A voltage type collision detection circuit

A collision detection, voltage-based technology, applied in circuits or fluid pipelines, tractors, vehicle components, etc., can solve the problems of filtering effect, low driving ability, low power supply voltage of single-chip microcomputer, etc., to avoid system power consumption or device damage, improve drive capability, filter out the effect of external disturbances
CN110758309BActive Publication Date: 2022-08-09ZHEJIANG GEELY HOLDING (GROUP) CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHEJIANG GEELY HOLDING (GROUP) CO LTD
Publication Date
2022-08-09

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Abstract

The invention discloses a voltage type collision detection circuit, comprising: a collision signal generator, a collision signal processing circuit and a microprocessor connected in sequence; the collision signal processing circuit comprises a switch circuit, a voltage divider circuit and a comparison circuit connected in sequence; The switch circuit includes: a first resistor and a transistor, one end of the first resistor is coupled to the collision signal generator, and the other end of the first resistor is coupled to the gate of the transistor; the voltage divider circuit includes: a second resistor and a third resistor, One end of the second resistor is coupled to the positive electrode of the first power supply, and the other end of the second resistor is coupled to one end of the third resistor and the drain of the transistor, respectively; the comparison circuit includes: a comparator, the non-inverting end of the comparator is connected to the first The other ends of the two resistors are coupled, the output end of the comparator is coupled to the microprocessor, and the positive electrode of the comparator is coupled to the positive electrode of the second power supply. The present invention can ensure that the transistor is effectively turned off, and avoid potential system power consumption or device damage.
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Description

technical field

[0001] The invention relates to the field of automobile safety, in particular to a voltage type collision detection circuit. Background technique

[0002] At present, automobile traffic presents the trend of high-speed vehicles, unprofessionalization of drivers and dense traffic flow, which leads to frequent traffic accidents of vehicle-vehicle collisions and collisions between people and vehicles, which makes the research on automobile collision detection circuits of great practical significance.

[0003] ACU (Airbag Control Unit, airbag control unit) is an electronic control module, which is an important part of the car occupant auxiliary protection system, and is installed in the front end area of ​​the central tunnel of the front floor of the vehicle. When the car collides, the ACU can send a collision signal to the car controller to realize the collision unlocking, fuel cut off or high voltage circuit cut off. The voltage-type collision signal is a PWM ...

Claims

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