Base drive circuit for a four-terminal power Darlington
Patent
·
OSTI ID:864540
- Blacksburg, VA
- Salem, VA
A high power switching circuit which utilizes a four-terminal Darlington transistor block to improve switching speed, particularly in rapid turn-off. Two independent reverse drive currents are utilized during turn off in order to expel the minority carriers of the Darlington pair at their own charge sweep-out rate. The reverse drive current may be provided by a current transformer, the secondary of which is tapped to the base terminal of the power stage of the Darlington block. In one application, the switching circuit is used in each power switching element in a chopper-inverter drive of an electric vehicle propulsion system.
- Research Organization:
- Virginia Polytechnical Institute and State University
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Number(s):
- US 4380795
- OSTI ID:
- 864540
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
/363/318/
application
base
base drive
block
carriers
charge
chopper-inverter
circuit
current
current transformer
currents
darlington
darlington transistor
drive
drive circuit
drive current
drive currents
electric
electric vehicle
element
expel
four-terminal
improve
independent
minority
minority carrier
minority carriers
pair
particularly
power
power switching
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provided
rapid
rate
reverse
reverse drive
secondary
speed
stage
sweep-out
switching
switching circuit
switching element
switching speed
tapped
terminal
transformer
transistor
turn-off
utilized
utilizes
vehicle
vehicle propulsion
application
base
base drive
block
carriers
charge
chopper-inverter
circuit
current
current transformer
currents
darlington
darlington transistor
drive
drive circuit
drive current
drive currents
electric
electric vehicle
element
expel
four-terminal
improve
independent
minority
minority carrier
minority carriers
pair
particularly
power
power switching
propulsion
provided
rapid
rate
reverse
reverse drive
secondary
speed
stage
sweep-out
switching
switching circuit
switching element
switching speed
tapped
terminal
transformer
transistor
turn-off
utilized
utilizes
vehicle
vehicle propulsion