Base drive and overlap protection circuit
- Southfield, MI
An inverter (34) which provides power to an A. C. machine (28) is controlled by a circuit (36) employing PWM control strategy whereby A. C. power is supplied to the machine at a preselectable frequency and preselectable voltage. This is accomplished by the technique of waveform notching in which the shapes of the notches are varied to determine the average energy content of the overall waveform. Through this arrangement, the operational efficiency of the A. C. machine is optimized. The control circuit includes a microcomputer and memory element which receive various parametric inputs and calculate optimized machine control data signals therefrom. The control data is asynchronously loaded into the inverter through an intermediate buffer (38). A base drive and overlap protection circuit is included to insure that both transistors of a complimentary pair are not conducting at the same time. In its preferred embodiment, the present invention is incorporated within an electric vehicle (10) employing a 144 VDC battery pack (32) and a three-phase induction motor (18).
- Assignee:
- Eaton Corporation (Cleveland, OH)
- Patent Number(s):
- US 4371824
- OSTI ID:
- 864482
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
10
144
18
28
32
34
36
38
accomplished
arrangement
asynchronously
average
average energy
base
base drive
battery
battery pack
buffer
calculate
circuit
complimentary
complimentary pair
conducting
content
control
control circuit
control data
control strategy
controlled
data
data signal
data signals
dc battery
determine
drive
efficiency
electric
electric vehicle
element
embodiment
employing
employing pwm
energy
energy content
frequency
included
incorporated
induction
induction motor
inputs
insure
intermediate
intermediate buffer
inverter
loaded
machine
machine control
memory
memory element
microcomputer
motor
notches
notching
operational
operational efficiency
optimized
optimized machine
overall
overall waveform
overlap
pack
pair
parametric
parametric inputs
power
preferred
preferred embodiment
preselectable
preselectable frequency
preselectable voltage
protection
protection circuit
provides
provides power
pwm
pwm control
receive
receive various
selectable frequency
shapes
signals
strategy
strategy whereby
supplied
technique
therefrom
three-phase
three-phase induction
time
transistors
varied
various
various parametric
vdc
vdc battery
vehicle
voltage
waveform
waveform notching
whereby