Electricity: power supply or regulation systems – In shunt with source or load – Using a three or more terminal semiconductive device
Patent
1998-04-24
2000-08-29
Han, Y. J.
Electricity: power supply or regulation systems
In shunt with source or load
Using a three or more terminal semiconductive device
323225, 363124, G05F 146
Patent
active
061113921
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
This invention relates to a power source device in which a plurality of switching circuits performing a power conversion respectively commonly use a switching element and, more particularly, to a power source device provided with an inverter circuit for improving any distortion of an input from an AC power source by means of a chopper circuit and for supplying to a load circuit a low frequency output synchronized with the AC power source.
BACKGROUND ART
An example of the power source device of this kind has been disclosed in Japanese Patent Laid-Open Publication No. 2-282809, in which the power source devices comprise, as shown in FIG. 24, a boosting chopper circuit for improving the input current distortion by means of switching elements Q1 and Q2, inductor L1 and diodes D5 and D6, and a buck converter for limiting a load current by means of switching elements Q1-Q4 and inductor L2.
Referring more specifically to FIG. 24, there are connected, in parallel to a smoothing capacitor C, series connections respectively of diodes D1 and D2, of diodes D3 and D4, of the diodes D5 and D6, of the switching elements Q1 and Q2 and of the switching elements Q3 and Q4. A junction point between the switching elements Q1 and Q2 and a junction point between the diodes D1 and D2 are connected. Further, a junction point between the switching elements Q3 and Q4 and junction point between the diodes D3 and D4 are connected. Between the junction point of the switching elements Q1 and Q2 and the junction point of the switching elements Q3 and Q4, a series connection of the inductor L2 and a load Z is connected. Between the junction point of the diodes D5 and D6 and the junction point of the switching elements Q1 and Q2, a series connection of an AC power source P through a filter circuit F to the inductor L1 is connected.
In this case, a control circuit (not shown) is controlling ON/OFF operation of the switching elements Q1-Q4 with outputs ON/OFF signals to gate electrodes of the switching elements Q1-Q4, so that, in positive half cycles of AC source power, the switching element Q1 is alternately made ON and OFF, the switching elements Q2 and Q3 are made OFF and the switching element Q4 is made ON. In negative half cycles, on the other hand, the switching element Q2 is alternately made ON and OFF, the switching elements Q1 and Q4 are made OFF and the switching element Q3 is made ON.
The operation of the conventional device of FIG. 24 shall be described with reference to FIG. 25. First, when the AC power source P is in the positive half cycle so that the switching elements Q1 and Q4 are ON and the switching elements Q2 and Q3 are OFF, a current flows, as shown in FIG. 25a, through a path of the AC power source P, filter circuit F, diode D5, switching element Q1 and inductor L1, to have an energy accumulated in the inductor L1. Also, a current flows from the smoothing capacitor C through a path of the switching element Q1, inductor L2, load circuit Z and switching element Q4 to cause a voltage at the smoothing capacitor C dropped by the inductor L2 and supplied to the load circuit Z. Further, with the current flowing to the inductor L2, an energy is accumulated in the inductor L2.
Next, as the switching element Q1 only is made OFF, a voltage is generated across the inductor L1 by the accumulated energy in the inductor L1, and this voltage is charged through the diode D2 in the smoothing capacitor C as superposed on a voltage of the AC power source P. That is, as shown in FIG. 25b, a current flows through a path of the AC power source P, filter circuit F, diode D5, smoothing capacitor C, diode D2 and inductor L1, to cause the energy in the inductor L1 discharged. Due to this, there is always flowing a current of high frequency from the AC power source P, and any input current distortion is improved by shaping the waveform of the current by means of the filter circuit F. At the smoothing capacitor C, further, there is obtained a voltage higher than a peak value of the AC power source P. Still fu
Hizuma Shinji
Iwahori Yutaka
Nakamura Toshiaki
Shinbori Hiroichi
Shiomi Tsutomu
Han Y. J.
Matsushita Electric & Works Ltd.
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