Patent ID: 9564797
Date: 2017-02-07
CPC Classifications: H02M,Y02B

Claim:
1. An indirect matrix converter comprising: a converter receiving input of an AC voltage, converting said AC voltage into a DC voltage, and applying said DC voltage between a first power line on a positive electrode side and a second power line on a negative electrode side; a snubber circuit that has a diode connected in series with a capacitor between said first and said second power lines, said diode having a first forward direction from said first power line to said second power line in a first series path with said capacitor; an inverter converting said DC voltage into an AC voltage, and applying said AC voltage to an inductive load; an inverter-side current detection unit detecting a current that flows through one of said first power line and said second power line between said inverter and said snubber circuit; a clamp circuit that has a second diode connected in series with a second capacitor between said first and said second power lines, said second capacitor having a larger electrostatic capacity than that of said capacitor, and said second diode having a second forward direction from said first power line to said second power line in a second series path with said second capacitor; and a converter-side current detection unit provided between said clamp circuit and said converter, and detecting a second current that flows through said second power line, wherein wherein a series connection body of said capacitor and said diode has one end that is connected to said first power line between said clamp circuit and said inverter, and another end that is connected to said second power line between said converter and said clamp circuit such that a noise current that flows into the snubber circuit from the clamp circuit does not flow through the converter-side current detection unit.