Power conversion device
A first DC-DC conversion circuit and a second DC-DC conversion circuit, which are connected in parallel to one casing, are caused to operate independently of each other, whereby even in the event that a semiconductor switching element which configures either the first or second DC-DC conversion circuit fails, only a DC-DC conversion circuit which carries out a normal operation is caused to operate, thereby carrying out the continuation of power supply of a power conversion device.
1. A power conversion device, comprising:
a plurality of power conversion circuits which are provided inside a single casing and connected in parallel to each other;
a plurality of controllers which carry out control of respective power conversion circuits from among the plurality of power conversion circuits; and
a plurality of control power supplies which carry out the supply of power to respective controllers from among the plurality of controllers, wherein
the plurality of power conversion circuits each include:
a transformer having a primary winding and a secondary winding;
semiconductor switching elements connected to the primary winding;
rectifier circuits connected to the secondary winding;
a smoothing reactor connected to the output side of the rectifier circuits; and
a smoothing capacitor connected between the smoothing reactor and the ground, and wherein
the plurality of power conversion circuits are controlled independently of each other.
2. The power conversion device according to claim 1 , wherein
the plurality of power conversion circuits each include fuses at either the previous or subsequent stage or at both the previous and subsequent stages.
3. The power conversion device according to claim 2 , wherein
the fuses are provided inside the casing.
4. The power conversion device according to claim 2 , wherein
the fuses are provided outside the casing.
5. The power conversion device according to claim 1 , wherein
the plurality of power conversion circuits are interleaved driven.
6. The power conversion device according to claim 5 , wherein
currents distributed by the interleaved drive are caused to converge inside the casing.
7. The power conversion device according to claim 5 , wherein
currents distributed by the interleaved drive are caused to converge outside the casing.
8. The power conversion device according to claim 1 , wherein
the respective controllers and respective control power supplies are both provided independently for each power conversion circuit from among the plurality of power conversion circuits.
9. The power conversion device according to claim 1 , wherein
each controller from among the plurality of controllers causes the respective power conversion circuit from among the plurality of power conversion circuits to operate with a load distributed into the plurality of power conversion circuits so as to maximize efficiency, or stops the operation of a specific one of the plurality of power conversion circuits.
10. The power conversion device according to claim 1 , wherein
the plurality of power conversion circuits are driven by a hard-switching method.
11. The power conversion device according to claim 1 , wherein
the plurality of power conversion circuits are driven by a soft-switching method.
12. The power conversion device according to claim 10 , wherein
the plurality of power conversion circuits are configured as half bridge.
13. The power conversion device according to claim 11 , wherein
the plurality of power conversion circuits are configured as half bridge.
14. The power conversion device according to claim 10 , wherein
the plurality of power conversion circuits are configured as full bridge.
15. The power conversion device according to claim 11 , wherein
the plurality of power conversion circuits are configured as full bridge.
16. The power conversion device according to claim 1 , wherein
the switching elements are each a wide band gap semiconductor using a silicon carbide or gallium nitride-based material.