MT6M15962a
1. Features of the IGBT-IPM
© Fuji Electric Co., Ltd. All rights reserved.
An IPM (intelligent power module) is an intelligent IGBT module combining a built-in control IC which
includes a drive circuit and a protection circuit. The X-IPM (X series IPM) has the following features:
1.1 Built-in drive circuit
• Drives the IGBT under the optimized gate control conditions.
• No negative power supply is needed since it has minimum gate impedance between the drive circuit
and the IGBT devices.
• Four isolated power supply units are required: one (1) on the lower arm side, three (3) on the upper
arm side.
1.2 Built-in protection circuit
• Over current protection (OC), short circuit protection (SC), control power supply under voltage
protection (UV), IGBT chips over heating protection (
T
jOH
) and an external alarm signal output
(ALM) are integrated.
• OC and SC are functions to protect the IGBT against breakdown caused by an over current or a
load short-circuit. Each IGBT has an on-chip current sensor which can detect the collector current of
each IGBT. This feature can protect the IPM module against an over current and a short circuit that
may occur in any IGBT.
• UV is the protective function that works against a drive power supply voltage drop. Control IC for
each arm has this function.
•
T
jOH
provides a high-speed over temperature protection by using an on-chip temperature sensor.
• ALM sends an alarm signal to the outer peripheral control unit of the IPM when an OC, SC, UV
and/or
T
jOH
occur. Additionally the IPM initiates a safe soft stop of the system. *1
*1 See [Chapter 3 Description of functions] for details of protective functions of each IPM.
1.3 Built-in brake circuit (7in1 IPM)
• A brake circuit can be configured by adding an external resistor that dissipate electric power during
regeneration.
• The brake circuit has a drive circuit and protection circuit, similar to the inverter unit.
• In the X series IPM, even when the inverter part of the lower arm detects an abnormality and
protection is activated, the brake IGBT can operate independently. Therefore, it is possible to
suppress the rise in main power supply voltage due to deceleration resulting from abnormal stop
and prevent overvoltage destruction of the product.
1.4 IGBT chips temperature warning output function (specific model)
• The X series IPM has a function that notifies the IGBT chip is overheated by generating a warning
signal output when the IGBT chip reaches 150
°
C or higher. IGBT chips over heating protection
(
T
jOH
) operates by stopping the IPM and generate an alarm signal output when the IGBT chip
temperature rises above 175
°
C. However, in the temperature warning output function, the switching
operation is continued while the temperature warning signal is generated. By utilizing this function, it
is possible to avoid the system from stopping by changing the operating conditions before the IPM
is stopped by the over heating protection function.
In addition, it is possible to prevent a decrease in productivity due to a sudden equipment shutdown.
1-2
This chapter describes the features and structure of the X series IPM.
