Power transmission device and power reception device
An AC line filter is connected to an enclosure serving as a ground. A power transmission unit is configured to transmit electric power to a power reception device in a contactless manner. An inverter is provided between the AC line filter and the power transmission unit. A common mode filter is provided between the inverter and the power transmission unit. A Y capacitor of the common mode filter is not connected to the enclosure, but is connected to a power line between the AC line filter and the inverter.
1. A power transmission device comprising:
an AC line filter provided on an AC power line connected to an AC power supply, and connected to a ground;
an inverter configured to convert electric power supplied from the AC power supply through the AC line filter into electric power to be transmitted;
a power transmission coil electrically connected to the inverter, and configured to receive from the inverter the electric power to be transmitted and transmit the electric power to a power reception coil of a power reception device in a contactless manner; and
a common mode filter provided on a power line between the inverter and the power transmission coil,
the common mode filter including a first Y capacitor,
the first Y capacitor not being connected to the ground, but being connected to a power line between the AC line filter and the inverter.
2. The power transmission device according to claim 1 , further comprising a rectifier circuit electrically connected between the AC line filter and the inverter, wherein
the first Y capacitor is connected to a DC power line between the rectifier circuit and the inverter.
3. The power transmission device according to claim 2 , wherein
the rectifier circuit is a power factor correction circuit.
4. The power transmission device according to claim 2 , further comprising a second Y capacitor provided on the DC power line and connected to the ground.
5. A power reception device comprising:
a power reception coil configured to receive electric power from a power transmission coil of a power transmission device in a contactless manner;
a rectifier configured to rectify the electric power received by the power reception coil;
a DC filter provided on a power line to which the electric power rectified by the rectifier is output, and connected to a ground; and
a common mode filter provided on a power line between the power reception coil and the rectifier.
the common mode filter including a first Y capacitor,
the first Y capacitor not being connected to the ground, but being connected to a power line between the rectifier and the DC filter.
6. The power reception device according to claim 5 , further comprising a second Y capacitor provided on the power line between the rectifier and the DC filter and connected to the ground.