High-Voltage Isolated Half-Bridge Driver (Up to 1kV)

This fully isolated half-bridge driver is designed for high-voltage applications up to 1kV. It features 2 x 2W isolated DC-DC converters to independently power the low-side and high-side switching elements. The board is assembled with 1.2KV IGBTs, Two power LEDs provide visual indication of power presence for both the low-side and high-side gate drivers. The signal ground is galvanically isolated from the power ground, allowing it to be connected to any potential up to 2.5kV. Barrier connectors are provided for the load and its power supply. A screw terminal connector facilitates the 12V DC input for the gate driver circuitry. A LM78M05 regulator provides a 5V supply to the logic side of the gate driver input circuit. A header connector allows for PWM input via channels A and B, as well as enable/disable control.

The driver incorporates the following key components:

• UCC21520 Isolated Half-Bridge Driver Chip
• Two Isolated DC-DC Converters (one for each side), R12P21509D
• ZXGD30006 High-Current Gate Driver Chip
• Two 1.2KV/40Amp, FGH40T120SMD-ND

Important Considerations:

• Select appropriate IGBTs based on your specific power and frequency requirements.
• This board is suitable for DC bus voltages up to 800V Max 1KV.
• Testing was performed using a 6.5kHz TTL signal and a 105V DC power supply.

Features

• Power Supply Gate Driver 12V DC
• Power Supply Load 800V DC (Max 1KV)
• Gate Drive DC-DC Converter Voltage Output +15V / -9V
• On Board 5V Regulator to power the Gate Driver Input side circuit
• Common-Mode Transient Immunity (CMTI) greater than 125V/ns
• High Gate-drive Currents (up to 10A source and sink)
• Surge immunity up to 10kV
• Programmable overlap and dead time
• Fast disable for power sequencing
• 8000VPK reinforced Isolation per DIN EN IEC 60747-17 (VDE 0884-17)
• 7kVRMS isolation for 1 minute per UL 1577 (UCC21520)
• 4 x 4MM PCB Mounting Holes
• PCB Dimensions 79.69 x 70.17 mm