Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1980-01-11
1982-09-28
Shoop, William M.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
318811, H02M 112
Patent
active
043521525
ABSTRACT:
Method and apparatus are disclosed herein for controlling the voltage supplied to a motor to vary the speed thereof. A pulsewidth modulator is supplied a sawtooth waveform from a waveform generator and is controlled by an input signal to provide a variable duty cycle pulse train. The waveform generator also provides a start pulse which triggers an output driver circuit. The output driver circuit provides base current to a plurality of paralleled output transistor stages, which may be Darlington pairs, connected to the motor. The collector voltage of the output stages is monitored and, if it drops below a predetermined threshold at the edge of saturation, is clamped to a voltage and the edge of saturation, thereby preventing the output transistors from operating in saturation while at the same time minimizing the voltage across the collector of the output stages. This arrangement eliminates the need for emitter resistors while at the same time providing for high speed operation and better load sharing among the paralleled output transistors.
REFERENCES:
patent: 3319151 (1967-05-01), Kanngiesser
patent: 3740588 (1973-06-01), Stratton et al.
patent: 3859583 (1975-01-01), Reed
patent: 3906247 (1975-09-01), Heffner
patent: 4196320 (1980-04-01), Townsend
patent: 4204266 (1980-05-01), Kammiller et al.
Hybricon Inc.
Shoop William M.
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