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Stabilized-power-supply-unit

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Stabilized power supply unit

Details

Inventors: Tamoto, Sadaharu;
Assignee: Yutaka Electric Mfg. Co., Ltd. (JP)
Primary Examiner: Wong; Peter S.
Assistant Examiner:
Attorney, Agent or Firm: Lowe, Price, LeBlanc, Becker & Shur

A stabilized power supply unit designed to supply the power from the commercial power source as far as the commercial power source is normal but supply the power from a battery that can be made available by an automatic switching device when the commercial power source has failed, wherein the AC voltage from the commercial power source is rectified by a rectification circuit to obtain almost equal DC currents on both the positive and negative sides of the common line while the commercial power source is normal. Said DC voltage is chopped by the boosting chopper circuit to boost the voltage on both the positive and negative sides. The boosted voltage is converted into the AC voltage through the DC-AC inverter, and the high-frequency component of the AC voltage is compressed through the filter in order to be outputted as an AC voltage of specified frequency. When the AC voltage is not inputted due to the failure of the commercial power source, the DC voltage from the battery is applied to the DC-AC inverter in order to be converted into the AC current and outputted as the specified AC voltage through the filter. In this manner, the direct transmission circuit with a common line can be formed without including an isolation device.

DETAILED DESCRIPTION A power supply unit comprising a rectification circuit for converting the AC input power into DC power, a DC-AC inverter for reconverting the DC power into AC power, a battery for inputting its DC power to said DC-AC power inverter when the supply of AC power input is interrupted and a direct power supply circuit interposed between one of the input terminals of said AC input side and one of the output terminals of said AC output side through the change-over circuit, featuring the other one of the terminals of said AC input side and the other one of the teminals of said AC output side connected to each other through a common line, a rectification circuit of said AC input consisting of a circuit to enable the positive side and the negative side of said common line to produce almost equal DC voltages, a boosting chopper interposed between this rectification circuit and said DC-AC inverter with respect to the positive and negative sides of said common line, said DC-AC inverter consisting of a pair of switching elements taking the form of a half-bridge type circuit that is capable of supplying almost equal voltages to said common line.
In the stabilized power supply unit of the above-described composition, the AC voltage is inputted from the commercial power source as far as the commercial power source is normal, and the inputted AC voltage is rectified by the rectification circuit to provide almost equal DC voltages to both the positive and negative sides with respect to the common line.
The DC voltage is chopped by the boosting chopper circuit to boost the voltages at the positive and negative sides.
The boosted voltage is converted into the AC voltage by the DC-AC inverter, and the high-frequency component of the AC voltage is then compressed through the filter in order to be outputted as the AC voltage of predetermined frequency.
When the AC voltage input is not available due to the failure of the commercial power source, the DC voltage from the battery is applied to the DC-AC inverter for conversion into AC voltage, and the AC voltage is outputted at the predetermined voltage through the filter

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