Control of an inverter pulse-width modulator

Details Control of an inverter pulse-width modulator Control of an inverter pulse-width modulator

2007-03-13

2007-03-13

Riley, Shawn (Department: 2838)

Electric power conversion systems

Current conversion

Including an a.c.-d.c.-a.c. converter

Reexamination Certificate

active

11153623

ABSTRACT:
A modulation method for a pulse width modulator in the inverter section (11) of a frequency converter provided with a voltage intermediate circuit, said frequency converter comprising a single-phase mains bridge (10) to be connected to a single-phase alternating current source (UL, N), a direct-voltage intermediate circuit and a controlled load bridge (11) for feeding a three-phase alternating voltage (UR, US, UT) of varying frequency and amplitude into a load (13), for controlling the semiconductor switches of the inverter section, in which low-capacitance direct-voltage intermediate circuit the waveform of the intermediate-circuit voltage in a normal load situation follows the absolute value of the supply network voltage, and wherein the modulation is implemented using an estimate value of the intermediate-circuit voltage to control the semiconductor switches of the inverter section.

REFERENCES:
patent: 5535113 (1996-07-01), Konishi
patent: 44 28 682 (1996-02-01), None
patent: 1 073 192 (2001-01-01), None
patent: 1 496 605 (2005-01-01), None
patent: 111201 (2003-06-01), None

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