IGBT｜Application
IGBT IPM: Protection Functions and Operation SequencesControl inputs （HINU, HINV, HINW, LINU, LINV, LINW）of IGBT IPMs
2024.07.24
Points of this article
・The control pins HINU, HINV, HINW are control inputs for high side IGBTs, and the control pins LINU, LINV, LINW are control inputs for low side IGBTs, for the U, V, and W phases respectively.
・When an RC filter is inserted to avoid noise and prevent malfunctions, internal pulldown resistors must be considered, and the RC values must be set so as to satisfy the control pin input specifications.
・The control input pins HINU, HINV, HINW are provided with a proprietary ROHM function to indicate different resistance values according to the part number when there is no power at HVCC. Hence even after board mounting, the part number can be identified, so that erroneous mounting etc. can be checked.
・The resistance for part number identification is measured using a specific measurement method.
This article explains the final topic, “Control Input”, relating to “IGB IPMs: Protection Functions and Operation Sequence”.
- Short circuit current protection（SCP）
- Control power supply undervoltage lockout（UVLO）
- Thermal shutdown（TSD）
- Analog temperature output（VOT）
- Fault output（FO）
- Control inputs （HINU, HINV, HINW, LINU, LINV, LINW）
Control inputs （HINU, HINV, HINW, LINU, LINV, LINW）of IGBT IPMs
HINU, HINV, and HINW are the high side IGBT control inputs, and LINU, LINV, and LINW are the low side IGBT control inputs, for the U, V, and W phases respectively; ordinarily control signals from an MCU are input. The input signals are high-active. Below is a block diagram that includes an example of connections with an MCU. The pins surrounded by red lines are control input pins.
As a matter requiring attention with respect to control input pins, in order to prevent malfunctions, wiring must be kept as short as possible. In relation to this, when RC filters (R1 and C1 in the block diagram) are inserted in order to avoid influences such as noise, the internal pulldown resistors, also shown in the block diagram, must be considered. The pulldown resistors have a minimum value of 3.3 kΩ, typical value of 5.0 kΩ, and maximum value of 7.1 kΩ. These should be set so that the control pin input specifications are satisfied even when an RC filter is inserted. The specifications for the control input pins are as follows.
For control signals, there are recommended operating conditions such as lower and upper arm dead times, PWM input frequencies, minimum allowed input pulse widths, and the like, and these must be followed. For details, please refer to the product data sheet.
Product Identification Function via Control Input Pins
The control input pins HINU, HINV, HINW are provided with a function, unique to ROHM, for indicating different resistance values for different part numbers when there is no power at HVCC. Normally, the part number of a module is stamped on the rear surface of the package, but after mounting on a board, the rear surface cannot easily be viewed. This series of products has a function that enables identification of the part number after board mounting by measuring the resistance values from these pins, so that it is possible to detect erroneous mounting of products that use the same package but are from a different manufacturer and have different current ratings. Below are shown the resistance values for the different part numbers and the resistances at the control input pins HINU, HINV, HINW, as well as a block diagram.
In relation to this function, there are the following matters to confirm and points to be noted.
・When a voltage is not applied to the LVCC or HVCC pins, the HVCC control input pins HINU, HINV, HINW will indicate resistance values according to the specifications in the above table, whereas the LVCC control input pins LINU, LINV, LINW will be at high impedance.
・The control input pin internal pulldown resistors are effective when voltages are applied to the LVCC and HVCC pins as per the recommended operating conditions, and will indicate resistance values of 3.3 kΩ/5.0 kΩ/7.1 kΩ (minimum/typical/maximum values) (in the diagram above, the typical value of 5 kΩ is shown).
・When measuring the resistance values across HINU-GND, HINV-GND, and HINW-GND, if a current is not passed from the HINx pin to GND to perform the measurement, the correct resistance value cannot be measured.
Please see the following diagram regarding the third correct measurement method.
【Download Documents】 Basics of IGBTs
IGBTs are one of the typical power devices and are used in a wide range of applications including motor drives. This handbook provides a basic understanding of IGBTs, including their application scope and application picture based on their features, their structure and principle of operation, and how they compare with and use other power devices.
IGBT
Basic
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About IGBTs
- Applications Using IGBTs
- IGBT Structure
- Principles of Operation of IGBTs
- Range of Application of IGBTs
- IGBT Features: Comparisons with MOSFETs and Bipolar Transistors
- Selective Use of Power Devices in Motor Applications
- Short Circuit Withstand Time (SCWT) of IGBTs
- IGBTs Incorporating Fast Recovery Diodes (FRDs)
- About IGBT IPMs （Intelligent Power Modules）
Application
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IGBT IPM: Protection Functions and Operation Sequences
- Short Circuit Current Protection (SCP) Function of IGBT IPMs
- Control Power Supply Undervoltage Lockout（UVLO) Function of IGBT IPMs
- Thermal shutdown（TSD） Function of IGBT IPMs
- Analog Temperature Output（VOT）of IGBT IPMs
- Fault Output（FO）of IGBT IPMs
- Control inputs （HINU, HINV, HINW, LINU, LINV, LINW）of IGBT IPMs
- Protection Functions and Operation Sequences －Summary－
Product Information