Bridge circuit having polarity inversion protection means entail

Details Bridge circuit having polarity inversion protection means entail Bridge circuit having polarity inversion protection means entail

1995-03-16

1999-12-28

Leja, Ronald W.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 18, H02H 318

Patent

active

RE036472&

ABSTRACT:
The additional voltage drop across a guard diode against supply polarity inversion in an integrated bridge circuit for driving an external load and employing two high-side NPN power switches driven by two PNP transistors, all monolithically integrated using a junction-type isolation technique, is substantially eliminated by connecting the emitters of the two PNP drive transistors directly to the positive rail, i.e. to the anode of the guard diode. Integrated PNP transistors are per se intrinsically protected against polarity inversion and when so connected permit to reduce the overall voltage drop across the driving bridge circuit. Using a Zener diode as the guard diode and a second Zener diode connected in opposition to the first Zener between the cathode thereof and the negative supply rail an additional spike protection of the circuit's components is implemented.

REFERENCES:
patent: 4336562 (1982-06-01), Kotowsaki
patent: 4654568 (1987-03-01), Mangmann

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