Pulse width modulator

Electricity: motor control systems – Open loop speed control system for dc motor with commutator – Armature control by digital or combined analog and digital...

Reexamination Certificate

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Details

C388S811000, C388S831000

Reexamination Certificate

active

07006762

ABSTRACT:
The present invention encompasses a high efficiency pulse width modulator comprising: a variable duty cycle oscillator for receiving an input signal and providing a low level switching signal; a source voltage differentiation dependant positive switching signal circuit for receiving the low level switching signal, a stable reference signal, a sample of a positive supply voltage signal, and an error signal and the providing a positive supply switching signal and a reference signal; a positive supply switching circuit for receiving the positive supply switching signal and providing an output signal to an inductive load; an output voltage dependant negative supply switching signal circuit for receiving the output signal and a negative supply voltage signal and providing a negative supply switching signal; a negative supply switching circuit for receiving the negative supply switching signal and providing clamping of the inductive load to the negative supply, an output sourced charge pump for receiving the output signal and the positive supply voltage signal and providing a high voltage power supply; an output comparison circuit for receiving a sample of the output signal and a reference signal from the positive supply switching circuit, comparing the output signal to the reference signal and turning off the positive supply switching circuit when the output signal is lower than the reference signal; and a timing circuit for receiving an error signal from the comparison circuit and providing a feedback signal to the error circuit.

REFERENCES:
patent: 3577057 (1971-05-01), Dyer
patent: 3805258 (1974-04-01), Longrigg
patent: 4119901 (1978-10-01), Leenhouts
patent: 4211961 (1980-07-01), Marumoto et al.
patent: 4244015 (1981-01-01), Beebe
patent: 4409535 (1983-10-01), Hickman
patent: 6495996 (2002-12-01), Redlich
patent: 6504334 (2003-01-01), Sogawa
patent: 6614208 (2003-09-01), Narita
B.P. Lathi, “Signal Processing and Linear Systems”, Berkeley Cambridge Press, 1998. p. 277 defines a modulation signal; p. 257 defines a time shift property of a fourier transform signal.

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