Sanyo Electric Co., Ltd.

Sanyo Air-conditioners Co., Ltd.

Yasuhiro Makino

Keigo Onizuka

Masaki Madenokouji

Etsuko Yamamoto

Masaki Yugo

Takehito Ike

Masahiro Maekawa

Isao Morita

Hideaki Kato

Tetsuo Nomoto

Kazuhisa Otagaki

Wataru Horio

Takahisa Matsuo

Yuichi Izawa

Masanori Kobayashi

Etsuo Sakoguchi

Masaki Madenokoji

Lu Ding

Katsuhiko Ito

Ding Lu

Tadamasa Kawada

In a solar energy generator including a solar battery a microcomputer for controlling at least a boosting circuit and an inverter circuit so that AC power suitably usable as the AC power of a commercial power supply system can be supplied to the commercial power supply system, the power to be supplied to the various kinds of equipment of the solar energy generator is selectively supplied from one of the solar battery and the commercial power supply system. The microcomputer stores the operational status data of the solar energy generator into an external storage device, and these data can be used for maintenance or trouble shooting of the solar energy generator.

System interconnection electric power generator and control method therefor

A controlling device of a compressor is provided. A noise filter is arranged at an input of the inverter circuit that converts the commercial frequency to a driving frequency to control a motor driving a compressor mechanism, for suppressing a common mode noise of the commercial power source and the inverter circuit, and is connected to a ground through a metal frame used for receiving a compressor main body. The noise filter comprises coils connected between first capacitors and second capacitors that are connected in series between the AC power lines, and further comprises a clamper connected between nodes of the second capacitors and the metal frame for clamping a voltage and a third capacitor connected to the clamper in parallel. even though the new refrigerant, such as R410A, and the three-phase AC power source are used, the leakage current can be reduced by a simple structure and the increase of the noise terminal voltage can be also suppressed. Furthermore, both of the legal regulation requirements can be met.

Controlling device of compressor

A method whereby a plurality of inverters for converting DC power outputted from a DC power supply, such as solar cells or fuel cells, to AC power are operated efficiently without being biased to particular inverters. The number of inverters to be run is determined in correspondence with at least one output value of the DC output or AC output, and the determined number of inverters are selected and made to run from among the plurality of inverters on the basis of a predetermined rule. In addition, a parallel-connected system is disclosed for enabling efficient and appropriate parallel-in operation by the use of inverters, with one of the inverters controlling the remaining inverters and effecting system interconnection protection.

Method of operating a power supply system having parallel-connected inverters, and power converting system

A power inverter for use in the system interconnection of a direct-current supply with a commercial alternating-current supply includes an inverter circuit and a filter circuit. Feedback signals affecting the frequency of an output to be produced by the inverter circuit are taken from the filter circuit having frequency response characteristics such that the phase angle is reduced to 0.degree. at three frequencies consisting of a higher frequency, lower frequency and commercial frequency, the last of which lies halfway between the first and second. Under the normal condition, the frequency of the output produced by the inverter circuit is equal to the commercial frequency. In the event of a power failure or power cut in the commercial alternating-current supply system, deviation from the commercial frequency is caused by the characteristics of the filter circuit.

Power inverter for use in system interconnection

A current resonance DC-DC converter has a ZCS resonance switch circuit which comprises a semiconductor switch device 7 and a diode 8 connected together into a parallel circuit, the diode 8 being connected at its cathode to one end of a DC power supply 1, a center-tapped resonance inductance 13 adapted to produce voltages of the same polarity across the center tap and its respective opposite ends and connected at its resonance side to the anode of the diode 8, and a resonance capacitor 6 connected to the center tap of the resonance inductance 13 and to the above-mentioned one end of the power supply 1, the resonance inductance 13 being connected at a transformerside terminal thereof to one end of the primary inductance 4 of a high-frequency transformer HT, the other end of the primary inductance 4 being connected to the other end of the power supply 1.

Zero current switching DC-DC converter incorporating a tapped resonant

A power source apparatus for microwave oven includes a half-bridge converter including a series connection of switching elements, a series connection of resonance capacitors, and a high frequency transformer having a primary winding and a secondary winding, and the half-bridge converter is driven by an output of a diode bridge which receives a commercial power source of 200 V. A current transformer detects a current of the primary winding. A control circuit compares a voltage equal to an average value of the current detected by the current transformer and a voltage set by a microcomputer, and controls the switching elements at a frequency in proportion to a magnitude of a difference of the both voltages, whereby a high frequency high voltage is induced on the secondary winding and applied to a voltage doubler rectifying circuit, and then a direct current high voltage is applied to a magnetron.

Half-bridge converter switching power supply for magnetron

Growing community of inventors

Saitama, Japan

Yasuhiro Makino