Electric power conversion systems – Current conversion – With means to selectively provide d.c. of either polarity
Patent
1997-07-22
1998-09-29
Berhane, Adolf
Electric power conversion systems
Current conversion
With means to selectively provide d.c. of either polarity
307 45, 307127, 307128, 361245, H02M 702, C23C 1434
Patent
active
058153888
ABSTRACT:
A polarity reversing circuit having energy compensation may comprise a first inductor connected between the first electrode and a negative terminal of a power supply. The positive terminal of the power supply is connected to the second electrode. A diode and a first capacitor are connected in series across the first inductor so that the cathode of the diode is connected to the first electrode. A second capacitor and a switching device are also connected in series across the first and second electrodes. A second inductor is connected between the switching device and the anode of the diode. A bi-directional converter is connected between the power supply and the second capacitor. The voltage polarity between the first and second electrodes may be reversed by actuating the switching device to switch between a non-conducting state and a conducting state. The voltage polarity may be returned to the normal polarity by again actuating the switching device to switch it from the conducting state to the non-conducting state. A bi-directional converter transfers electrical energy between the polarity reversing circuit and the power supply to compensate for variations in the amount of energy reflected by the electrodes during operation.
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