IVT 12KHR-N Service Manual page 20

12KHR-N
4. Explanation of IPM drive circuit
The IPM for compressor drive is made by Mitsubishi Electric.
The power supply for the IPM drive and the shunt resistance for overcurrent detection, are provided outside the IPM.
4.1. IPM drive power supply circuit
The power supply for the upper-phase IGBT (HU, HV, HW) drive employs a bootstrap system, and provides power to the upper-phase IC.
The 15-V power supply for the lower-phase IC is provided by the control printed circuit board (PCB).
4.1.1 Brief explanation of bootstrap system (single power drive system)
To supply power to the upper-phase IC, the microcomputer (IC1) turns ON the lower-phase IGBT (LU, LV, LW).
This results in a charging current that flows to the electrolytic capacitor of each upper-phase IC input and charges the bootstrap capacitor with a 15-V
current.
The power supply for the subsequent stages is charged while the lower-phase IGBT is ON in ordinary compressor drive control.
Initial charge period
V
DB
High-voltage-withstanding,
high-speed recovery diode
V
D
V ( )
CIN n
Charging current group
Bootstrap capacitor
(HU,HV,HW)
HVIC
(LU,LV,LW)
LVIC
Bootstrap circuit
2 – 16
P(Vcc)
U,V,W,
N-side
IGBT
N(GND)