Power conversion device
AssigneeFuji Electric Co., Ltd.
InventorsAkihiro Odaka, Akio Toba, Masakazu Gekinozu, Kouetsu Fujita
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Abstract
With a power conversion device, it is possible to lengthen the lifespan of a mechanical switch by preventing an absorption by the mechanical switch of induction energy accumulated in a reactor when there is a problem. When a mechanical switch is turned off when there is a problem, an absorption by the mechanical switch of induction energy accumulated in a reactor is prevented by the energy accumulated in the reactor being released to a capacitor via a diode, thus enabling a lengthening of the lifespan of the mechanical switch.
Claims20
A power conversion device, comprising:
- a power semiconductor series circuit including a first power semiconductor switch and second power semiconductor switch connected in series;
- a capacitor connected in parallel to the power semiconductor series circuit;
- a reactor, of which one end is connected to a series connection point of the first power semiconductor switch and second power semiconductor switch;
- a first power diode, whose anode is connected to another end of the reactor and whose cathode is connected to a high potential side end of the power semiconductor series circuit;
- and
- a second power diode, whose cathode is connected to the other end of the reactor and whose anode is connected to a low potential side end of the power semiconductor series circuit.
A power conversion device, comprising:
- a power semiconductor series circuit including a first power diode and a power semiconductor switch connected in series;
- a capacitor connected in parallel to the power semiconductor series circuit;
- a reactor, of which one end is connected to a series connection point of the first power diode and power semiconductor switch;
- and
- a second power diode, whose cathode is connected to another end of the reactor and whose anode is connected to a low potential side end of the power semiconductor series circuit.
A power conversion device, comprising:
- a power semiconductor series circuit including a power semiconductor switch and a first power diode connected in series;
- a reactor, of which one end is connected to a series connection point of the power semiconductor switch and first power diode;
- a capacitor connected to another end of the reactor and a low potential side end of the power semiconductor series circuit;
- and
- a second power diode, whose anode is connected to the other end of the reactor and whose cathode is connected to a high potential side end of the power semiconductor series circuit.
An apparatus, comprising:
- a first switching device and a second switching device connected in series at a first node;
- a capacitive device connected in parallel to the first switching device and the second power switching device;
- a first diode and a second diode connected in series at a second node;
- and
- a reactive device connected between the first node and the second node.
An apparatus, comprising:
- a switching device and a first diode connected in series at a first node;
- a capacitive device connected in parallel to the switching device and the first diode between a second node and a third node;
- a reactive device connected between the first node and a fourth node;
- and
- a second diode connected between the fourth node and the third node.
An apparatus, comprising:
- a switching device and a first diode connected in series at a first node, and between a second node and a third node;
- a reactive device connected between the first node and a fourth node;
- a capacitive device connected between a fourth node and the third node;
- and
- a second diode connected between the fourth node and the second node.
Dependencies are inferred from the claim text.