Hitachi Information & Telecommunication Engineering, Ltd.

Hitachi Information & Telecommunication Eng., Ltd.

Kosuke Abe

Fumikazu Takahashi

Takae Shimada

Kimiaki Taniguchi

A power converter includes a plurality of converters which are connected in parallel to a DC power supply in which an operating point is changed in accordance with an output current or an output voltage. The plurality of converters include maximum power point tracking units for performing maximum power point tracking calculations of the DC power supply. Results of the maximum power point tracking calculations of the plurality of converters are unified between the plurality of converters and the plurality of converters are controlled based on the unified calculation result.

Power converter

In a step-up step-down converter device, a diode is connected in parallel to a switch connecting a positive pole side and a negative pole side for stepping up and stepping down an input voltage, a diode is connected in parallel to a switch in a positive pole side of a closed circuit constructed between an input direct voltage and an output side load, and a control circuit detecting an output voltage generates 1Phase PWM and 2Phase PWM obtained by logically adding and multiplying two difference values having phase difference in comparison with a triangle waveform signal which is 180 degrees different in phase from an error signal based on a difference value between the output voltage and a target reference voltage, and alternately turns on and off switches respectively by using 1Phase PWM or 2Phase PWM at the step-down or step-down operation time.

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Yokohama, Japan

Kosuke Abe