PWM drive apparatus and method for correcting output offset...

Details PWM drive apparatus and method for correcting output offset... PWM drive apparatus and method for correcting output offset...

2007-11-14

2010-10-19

Leja, Ronald W (Department: 2836)

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

Systems for magnetizing, demagnetizing, or controlling the...

Reexamination Certificate

active

07817399

ABSTRACT:
A first voltage-to-current converter converts a difference voltage between a command voltage and a reference voltage into a current. A second voltage-to-current converter converts a difference voltage between a positive output terminal and a negative output terminal of a PWM drive apparatus into a current. A low-pass filter is connected to a connection point between an output terminal of the first voltage-to-current converter and an output terminal of the second voltage-to-current converter. An amplifier amplifies a difference voltage between a voltage at the connection point and a reference voltage. A PWM modulator PWM-modulates an output voltage of the amplifier. A drive section drives a load in accordance with an output signal of the PWM modulator.

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patent: 2008/0130186 (2008-06-01), Nagase et al.
patent: 3803437 (2006-05-01), None

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