Power unit

Abstract

Abstract PURPOSE:To suppress a pulsation of a DC input current to a DC/AC converter, to operate it at the maximum power point of a solar battery, and also to make a DC filter small in size by providing a chopper circuit, a detecting means for detecting a pulsating current of a generated output, and a DC/DC converter having a pulse width modulating circuit. CONSTITUTION:In case when a pulsation has been generated in a generated output of a solar battery 1, an AC portion of the pulsation is detected by a current transformer 6 and a pulsating current detecting signal is applied to an input terminal (a) of a pulse width modulating circuit 7, and it is converted to a voltage value as a voltage drop of the first resistance R1 and also a component being less than two times of a commercial frequency is eliminated by a high-pass filter 8, and given as a feedback quantity for a pulse width modulation control. When the potential of an output signal of the high-pass filter 8 becomes positive (or negative) in accordance with the pulsation, a pulsation input signal to an amplifier 9 is amplified by an amplification factor determined by resistances R2, R3 and becomes an output signal of the negative (or positive) potential, a pulse signal whose duty ratio is smaller (or larger) than 50% of a reference is outputted from a comparator 11, and through a base driving circuit 12, an 'on' period of a transistor Q is made variable against 50% duty.

Inventors

• 👤 Kazufumi Ushijima
• 👤 牛嶋　和文
• 👤 Kazuyoshi Tsukamoto
• 👤 塚本　一義

Bibliographic Details