Comparative test of IGBT7 and IGBT4 in servo drive
As Infineon's latest generation IGBT technology platform, the performance comparison between IGBT7 and IGBT4 has always been a concern for engineers. This article tests FP35R12W2T4 and FP35R12W2T7 in the same platform servo drive, and obtains the junction temperature comparison between IGBT4 and IGBT7 under the same working conditions. The experimental results show that in the comparison test of continuous high-power load conditions and inertia disk load conditions, the junction temperature of IGBT7 is lower than that of IGBT4.
The servo drive system has a fast response speed, high overload multiples, and the trend of miniaturization and high power density has put forward more stringent requirements on power devices. Infineon's star product IGBT7 perfectly meets all the needs of servo drives with its ultra-low on-state voltage drop, controllable dv/dt, and 175℃ overload junction temperature. Infineon, Jingchuan, and Maixin jointly developed a complete servo drive solution based on IGBT7, which can significantly improve power density. The driver chip uses Infineon's coreless transformer 1EDI20I12MH. Because of the unique capacitor structure of IGBT7, it is not easy to parasitic conduction, so a single power supply design can be used, which simplifies the drive design to the greatest extent. The main control MCU uses XMC4700/4800, and the motor position detection uses TLE5109 to achieve precise control of speed and position.
Servo drive prototype
Servo drive power board
Servo drive control board
In order to compare the performance of IGBT4 and IGBT7 in servo drive, we used two servo drives on the same platform, equipped with FP35R12W2T4 and FP35R12W2T7 with the same PIN pin layout, and tested them under the same dv/dt conditions (dv/dt=5600V/us).
We designed two typical working condition comparison schemes to compare the junction temperature of IGBT4 and IGBT7 under the same working conditions, namely continuous large load comparison test and inertia load comparison test. The IGBT chip in the IGBT module to be tested is pre-embedded with a thermocouple. By connecting the thermocouple to the data acquisition instrument, the junction temperature of the IGBT chip can be directly read.
Continuous large load comparison test
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Two motors are used for loading, the motor system under test works in the electric state, and the load motor system works in the power generation state;
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The motor under test is driven by a driver based on IGBT4 and IGBT7 respectively. The switching frequency and output current/power of the two drivers are the same each time they are loaded.
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Use a power analyzer to test the input power and output power of the driver and calculate the loss and efficiency of the driver.
Continuous large load comparison test platform
The figure below is a comparison of the junction temperatures of IGBT4 and IGBT7 under continuous high load conditions.
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