Electric power conversion systems – Current conversion – Having plural converters for single conversion
Patent
1999-09-24
2000-08-15
Riley, Shawn
Electric power conversion systems
Current conversion
Having plural converters for single conversion
307 82, H02M 700
Patent
active
061046248
ABSTRACT:
Buck-boost type or buck type chopper circuits and transistors are employed as inverters (IV1, IV2) and power synchronizing switches (SW1, SW2), respectively. A PWM signal is applied to transistors of the chopper circuits to convert DC voltage generated by solar cells (DC1, DC2) into positive and negative half-wave AC voltages for an AC power supply (AC1). The inverters (IV1, IV2) output the AC voltages from their AC output terminals on alternate half cycles thereby to cause backflow of power. The power synchronizing switches (SW1, SW2) performs not only the function of transmitting the half-wave AC voltages generated by the inverters (IV1, IV2) to the AC power supply (AC1) in accordance with the AC cycle of the AC power supply (AC1), but also the function of, when one of the inverters is in operation, insulating the other from the AC power supply (AC1). This achieves a DC-AC system connecting device that is capable of establishing a ground for both DC and AC sides only with a few transistors and diodes without a transformer.
REFERENCES:
patent: 4823247 (1989-04-01), Tamoto
"Research and Development on Inverter Using Up/Down Type SMR Method" The 48.sup.th Meeting In Electric/Information Field held on Oct. 25, 1997, announced by Matsui et al. p. 129.
"Current and Examples of Application to Power Generator Using Sunlight"Power Electronics Guidebook, pp. 76-81 (1999).
Iida Takahiko
Iwamoto Hideo
Kake Educational Institution
Mitsubishi Denki & Kabushiki Kaisha
Riley Shawn
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