MOSFET 48V Inverter (Digital adapter slot)

Source

• uz_d_inverter Repository with Altium project

Functionality

The UltraZohm digital inverter consists of three MOSFET half-bridges. It is equipped with bi-directional current measurement for each phase and the DC-link current, measurements for the phase and DC-link voltages, and temperature measurement for each semiconductor. The voltage measurement is equipped with a 1st order low-pass filter. The current measurement is realised with shunt resistors. The inverter has a dedicated PWM enable pin. If the PWM_EN is set to false, both semiconductors of each half-bridge are disabled. Overcurrent protection for the three phases and the DC-link is included. The OCP is not designed for half-bridge shorts and will only trip if the phase or DC-link currents exceed the safe operating window. When triggered, the OCP will only flag a FAULT bit in the corresponding software driver. The inverter will not shut down automatically. Each half-bridge is designed in a non-bootstrap configuration. Each voltage and current measurement signal of the three phases and the DC-link are converted from single-ended to differential transmission to reduce the susceptibility to interference. The measured signals are transmitted over ethernet cables and are directly compatible with the Analog LTC2311-16 Rev05 and Rev06, Analog LTC2311-16 3v01 and Analog LTC2311-16 2vXX cards. An additional heat sink can be fitted to increase heat dissipation and keep the switches cooler. For additional information or an in-depth look at the circuit design, please refer to the schematics in the References section.

Revisions

• Digital Inverter Rev02
• Digital Inverter Rev03

Components

• MOSFET (100 V, 97 A, 6.0 \(m\Omega\)) ISC060N10NM6ATMA1

• Gate-Driver EiceDRIVER 2EDF7275KXUMA1

• Isolated DC/DC Converter for gate 12V supply PDSE1-S24-S12-M-TR

• Bi-directional current measurement MAX40056TAUA+

• Differential operational amplifier ADA4940-1ARZ

• Temperature measurement LM57CISD-10/NOPB

• Voltage to PWM frequency converter LTC6992HS6-4#WTRMPBF

Heatsink

The PCB is prepared for the installation of a heat sink. Four holes have been drilled to allow the use of maximum M3 screws. It is intended that the heatsink will have the appropriate holes with threads into which the screws can be screwed. For further information on the dimensions of the heatsink and the location of the screw holes, refer to the diagram below. The dimensions take into account the safety margin required for the mounting rails in the UltraZohm. A simple passive heatsink is sufficient for operation. An advanced actively cooled heatsink, either air or water cooled, can also be fitted if required.

Fig. 245 Heatsink dimensions