Circuit for driving the motor of a temperature blend door

Details Circuit for driving the motor of a temperature blend door Circuit for driving the motor of a temperature blend door

1995-05-31

1997-09-09

Ro, Bentsu

Electricity: motive power systems

Motor-reversing

Armature or primary circuit control

318266, 318286, 318293, H02P 122

Patent

active

056660367

ABSTRACT:
A circuit for driving a motor used to control the HVAC blend door in an automobile is disclosed. The circuit includes an amplifier circuit, an motor, and a three state driver circuit. The driver circut includes three NPN bipolar transistors and two PNP bipolar transistors configured such that the output of the three state driver circuit is turned off if the input is at a intermediate voltage. The output of the three state driver circuit is at a high voltage if the input is at a low voltage. Conversely, the output of the three state driver circuit is at low voltage when the input is at a high voltage.

REFERENCES:
patent: 2134901 (1938-11-01), Wey
patent: 3146390 (1964-08-01), Wolff
patent: 3586949 (1971-06-01), Spear et al.
patent: 3617849 (1971-11-01), Charlton
patent: 3697871 (1972-10-01), MacMullan
patent: 3776111 (1973-12-01), Maida
patent: 4388571 (1983-06-01), Tada et al.
Schilling, Donald et al.: Electronic Circuits: Discrete and Integrated, 3rd edition, Chapters 7.8 and 7.9 (pp. 362-368), McGraw-Hill, 1989.

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