Electricity: motive power systems – Positional servo systems – Pulse-width modulated power input to motor
Patent
1994-06-10
1996-04-09
Ro, Bentsu
Electricity: motive power systems
Positional servo systems
Pulse-width modulated power input to motor
318139, 318811, 388829, H02P 729
Patent
active
055064841
ABSTRACT:
A pulse width modulator (PWM) circuit for generating pulses to enable a driver control unit to drive a pair of switching circuits for an electric motor including an input section for receiving an N bit digitized input signal to be modulated and a PWM counter for continuously counting up from zero to a predetermined number and back down to zero, the PWM counter generating a digitized triangular waveform having N bits of resolution corresponding to the predetermined number. A compare unit receives and compares the digitized input signal and the digitized triangular waveform to produce an output pulse and a dead-time generator unit produces a first pulse and a second pulse from the output pulse produced from the compare unit. The first and second pulses each drives a corresponding one of the switching circuits and the first and second pulses have different transition times relative to each other. A built-in test (BIT) circuit provides BIT input signals corresponding to the first and second pulses to verify correct operation of the PWM circuit including a feed back path from the driver control unit, the driver control unit having a higher level of integration than the PWM circuit, and the BIT input signals providing individual control of each of the PWM signals.
REFERENCES:
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patent: 4356544 (1982-10-01), Ono et al.
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patent: 5055762 (1991-10-01), Disser et al.
patent: 5309079 (1994-05-01), Takada
Herman Beth A.
Lansberry Geoffrey B.
Munro James L.
Ro Bentsu
Westinghouse Electric Corp.
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