Apparatus for correcting DC component of output voltage in inver

Details Apparatus for correcting DC component of output voltage in inver Apparatus for correcting DC component of output voltage in inver

1987-10-14

1989-02-07

Salce, Patrick R.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363132, H02P 1320, H02M 112

Patent

active

048036110

ABSTRACT:
Apparatus for correcting a DC component of an output voltage in an inverter, where correction is performed so that DC component contained in AC output voltage of an inverter main circuit is reduced. The apparatus is provided with a current detecting circuit constituted by, for example, a saturable reactor installed within an inverter control circuit to control operation of switching elements constituting the inverter main circuit and connected in parallel to the output terminal side of the inverter main circuit for detecting the current of the AC output of the inverter, and a polarity discrimination circuit for automatically discriminating both positive and negative polarities in the current at the output side of the inverter main circuit detected by the current detecting circuit and for generating a DC component correcting signal in the inverter control circuit. Only when a DC component is superposed to AC output and applied, the DC component is magnetically saturated at the DC side so that the DC component appearing on AC output of the inverter main circuit is corrected.

REFERENCES:
patent: 4370702 (1983-01-01), Shuey et al.
patent: 4500837 (1985-02-01), Shuey et al.
patent: 4556842 (1985-12-01), Rosswurm
patent: 4739464 (1988-04-01), Nishihiro et al.
IEEE Industry Applications Society, Chargerless UPS Using Multi-Functional BIMOS Inverter--Sinusoidal Voltage Waveform Inverter with Current Minor Loop, Sep. 28-Oct. 3, 1986, pp. 513-514.
Sekino et al., Inverter Output Voltage Waveform Closed-Loop Control Technique, IEEE 1983, pp. 205-212, 1983.

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