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US 11,456,673 B2Granted
Power conversion device of a neutral point clamp type
AssigneeToshiba Mitsubishi-Electric Industrial Systems Corporation
InventorHaruyuki Yamaguchi
Life of this patent
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Abstract
A power conversion device includes first to fourth switching elements, and first to eighth diodes. The first to fourth diodes are electrically connected in inverse parallel to the first to fourth switching elements, respectively. The seventh diode is electrically connected in parallel to the second diode. The eighth diode is electrically connected in parallel to the third diode. The second diode is housed in a first package. The seventh diode is housed in a second package, which is different from the first package, and which does not include the switching elements. The eighth diode is housed in the second package, or alternatively, the eighth diode is housed in another package, which is different from the first package and the second package, and which does not include the switching elements.
Claims9
A power conversion device of neutral point clamp type comprising:
- first to fourth switching elements which are electrically connected to each other in series in an order of the first switching element, the second switching element, the third switching element, and the fourth switching element from a positive electrode toward a negative electrode;
- first to fourth diodes which are electrically connected in inverse parallel to the first to fourth switching elements, respectively;
- a fifth diode whose cathode is electrically connected to a first connection portion which electrically connects the first switching element to the second switching element and whose anode is electrically connected to a neutral point of the power conversion device;
- a sixth diode whose anode is electrically connected to a second connection portion which electrically connects the third switching element to the fourth switching element and whose cathode is electrically connected to the neutral point;
- a seventh diode which is electrically connected in parallel to the second diode;
- and
- an eighth diode which is electrically connected in parallel to the third diode,
- wherein the second diode is accommodated in a first package,
- the seventh diode is accommodated in a second package which is different from the first package and does not include the first to fourth switching elements, and
- the eighth diode is accommodated in the second package, or the eighth diode is accommodated in another package which is different from the first package and the second package and does not include the first to fourth switching elements,
- the power conversion device further comprising:
- an AC terminal to which AC power is supplied from an outside of the power conversion device;
- and
- a first conductor which extends from the first package to a first side toward the AC terminal or a conductor electrically connected to the AC terminal,
- wherein the second package is disposed on the first side with respect to the first package.
12 more elements
A power conversion device of neutral point clamp type comprising:
- first to fourth switching elements which are electrically connected to each other in series in an order of the first switching element, the second switching element, the third switching element, and the fourth switching element from a positive electrode toward a negative electrode;
- first to fourth diodes which are electrically connected in inverse parallel to the first to fourth switching elements, respectively;
- a fifth diode whose cathode is electrically connected to a first connection portion which electrically connects the first switching element to the second switching element and whose anode is electrically connected to a neutral point of the power conversion device;
- a sixth diode whose anode is electrically connected to a second connection portion which electrically connects the third switching element to the fourth switching element and whose cathode is electrically connected to the neutral point;
- a seventh diode which is electrically connected in parallel to the second diode;
- and
- an eighth diode which is electrically connected in parallel to the third diode,
- wherein the second diode is accommodated in a first package,
- the seventh diode is accommodated in a second package which is different from the first package and does not include the first to fourth switching elements, and
- the eighth diode is accommodated in the second package, or the eighth diode is accommodated in another package which is different from the first package and the second package and does not include the first to fourth switching elements,
- the power conversion device further comprising a second conductor which electrically connects the second diode, the fifth diode, and the seventh diode,
- wherein the first package has a first terminal which is connected to the second conductor,
- the second package has a second terminal which is connected to the second conductor,
- the fifth diode is accommodated in a third package which has a third terminal connected to the second conductor;
- and
- a shortest distance between the first terminal and the third terminal is shorter than a shortest distance between the second terminal and the third terminal.
13 more elements
A power conversion device of neutral point clamp type comprising:
- first to fourth switching elements which are electrically connected to each other in series in an order of the first switching element, the second switching element, the third switching element, and the fourth switching element from a positive electrode toward a negative electrode;
- first to fourth diodes which are electrically connected in inverse parallel to the first to fourth switching elements, respectively;
- a fifth diode whose cathode is electrically connected to a first connection portion which electrically connects the first switching element to the second switching element and whose anode is electrically connected to a neutral point of the power conversion device;
- a sixth diode whose anode is electrically connected to a second connection portion which electrically connects the third switching element to the fourth switching element and whose cathode is electrically connected to the neutral point;
- a seventh diode which is electrically connected in parallel to the second diode;
- an eighth diode which is electrically connected in parallel to the third diode;
- and
- an AC terminal which is electrically connected to a third connection portion which electrically connects the second switching element to the third switching element and a fourth connection portion which electrically connects the seventh diode to the eighth diode and to which AC power is supplied from an outside of the power conversion device,
- wherein the seventh diode is disposed farther from the second switching element than the second diode,
- a wiring length between the AC terminal and the seventh diode is shorter than that between the AC terminal and the second diode,
- the eighth diode is disposed farther from the third switching element than the third diode, and
- a wiring length between the AC terminal and the eighth diode is shorter than that between the AC terminal and the third diode.
9 more elements
Dependencies are inferred from the claim text.