Rotary electric machine unit having rotary electric machine with cooling part and electric power conversion device
摘要
說明書
In the present embodiment, the capacitor C1 is provided separately from the smoothing capacitor C2. The capacitor C1 may have a function of supplying electric charges required for switching the switching elements Q1 and Q2 of the upper and lower arm circuit 10, which is connected in parallel to the capacitor C1. Due to the switching, an energy loss occurs, and voltage between both ends of the upper arm and the lower arm drops. Therefore, the insufficient electric charges are supplied from the capacitor C1, which is connected in parallel. For this reason, the capacitance of the capacitor C1 is set to a value sufficiently smaller than the capacitance of the smoothing capacitor C2. For example, the capacitance of the smoothing capacitor C2 is set to 1000 μF, and the capacitance of the capacitor C1 is set to 10 μF to 20 μF. A power module 110, which will be described later, constitutes one parallel circuit 11.
The smoothing capacitor C2 is connected between the VH line 12H and the N line 13. The smoothing capacitor C2 is connected in parallel to the inverter 7. The smoothing capacitor C2 smooths, for example, a DC voltage, and stores the electric charge of the DC voltage. The voltage between the ends of the smoothing capacitor C2 provides a DC high voltage for driving the motor generator 3.
