NOISE PROTECTION CIRCUIT

PROBLEM TO BE SOLVED: To effectively protect the communication from external noise on the occasion of executing the communication through the power supply line. SOLUTION: To a side module 21 forming the air-bag system of vehicle, an output voltage of a battery 35 which is pumped with a DC-DC convert...

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Bibliographische Detailangaben
Hauptverfasser:	KITAHATA ATSUSHI, NISHII JUN
Format:	Patent
Sprache:	eng
Schlagworte:	CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS GENERATION PERFORMING OPERATIONS SYSTEMS FOR STORING ELECTRIC ENERGY TRANSPORTING VEHICLES IN GENERAL VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISEPROVIDED FOR
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To effectively protect the communication from external noise on the occasion of executing the communication through the power supply line. SOLUTION: To a side module 21 forming the air-bag system of vehicle, an output voltage of a battery 35 which is pumped with a DC-DC converter 36 connected to the power supply line 30 is supplied through the output line 44 of a constant voltage circuit 40. The output line 44 is used for communication to transmit the signal as a change of current under the control of an output transistor 25 by a microcomputer 22. Change of current is detected by the communication IC 45. In view of reducing the high voltage external noise entering the power supply line 30, a zener diode 37 is inserted. Moreover, the constant voltage circuit 40 reduces the high voltage external noise and the zener diode in the side module 21 protects over-voltage due to the external noise.