Protection device for control microcomputer in motor vehicle - disconnects supply voltage provided by solar cell upon abnormal battery output voltage

摘要

The protection device for a control microcomputer in a vehicle evaluates the voltage provided by the vehicle battery (5) to interrupt the lead between a solar cell (6) and the control microcomputer (13) when an abnormal battery output is detected. Pref. the microcomputer uses a MOSFET chip and is used to control a ventilation system for the vehicle passenger space with two ventilation fans for the left and right hand sides of the vehicle. The negative terminal of the vehicle battery is coupled to the vehicle earth line (12) and its positive terminal coupled to the microprocessor via a protection fuse (10). The negative side of the solar cell is similarly coupled to earth and its positive coupled to the microcomputer. ADVANTAGE - Prevents damage to MOSFET chip from abnormal supply voltage.