Specifications

24
Dec. 20
Mitsubishi IPM-series Application Note
9-2 Interface of control side of IPM
IPM (Intelligent Power Modules) is easy to operate. The integrated drive and protection circuits require only an
isolated power supply and a low level on/off control signal. A fault output is provided for monitoring the operation of
the module internal protection circuits.
(1) Circuit and circuit constant of the IPM interface circuit
The parts of connecting IPM and controller (CPU) are required to use following parts.
Input terminal Ԙ High speed photo-coupler ,ԙPull-up resistor
Ԛ Condenser (Ceramic condenser for the ripple removal
and electrolytic condenser for the power stabilization)
Fo terminal ԛ Low(high) speed photo-coupler
Control power supply Ԝ The mutually insulated stabilized power source of +15 V
(The negative power as it uses in IGBT-MOD is unnecessary.)
Example of constant value of the IPM interface circuit
Symbol Name Recommend Value Note
Rin Pull-up resistor 20kΩ All input terminal (include Br)
C1 Smoothing capacitor
≥ 10uF
Cp Bypass condenser 0.1 ~ 1uF
It is necessary that the charge and
discharge electric current and the
dv/dt electric current to IPM(IGBT
gate) can be sufficiently absorbed.
PC Photo-coupler High CMR, CTR ex.) PS9613
(2) IPM Internal circuit diagram and interface circuit
V
cin
Fo
V
cc
GND
1.5k
High speed
photo-coupler
15V Control
power supply
4KP
M
C1
҈10u
Cp
0.1u~1uF
.QYURGGFRJQVQEQWRNGT
IPM
100pF
(3) IPM Control terminals
The IGBT power switches in the IPM are controlled by a low level input signal. The active low control input will
keep the power devices off when it is held high. Typically the input pin of the IPM is pulled high with a resistor
connected to the positive side of the control power supply. An ON signal is then generated by pulling the control
input low.
The recommended value of the pull-up resistor is 20 kΩ but it can be smaller for the noise countermeasure
and so on. However, if the pull-up resistor is set too small, it will affect the lifetime of the photo-coupler, please
confirm the characteristics with lifetime and so on in the photo-coupler manufacturer.
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Using IPM