Isolated full bridge drive circuit design with schematic, bill of materials, assembly drawing, data sheet

Single chip microcomputer STM32L151CCU6

1206RGB (single)

GW MB10F 0.8A 1000V rectifier bridge

AVX tantalum capacitor bias material TLJA227M004R1100 original spot

Summary:

Circuit function and advantage

This circuit is an H-bridge consisting of a high-power switching MOSFET controlled by a low-voltage logic signal. This circuit provides a convenient interface for low level logic signals and high power bridges. Low-cost N-channel power MOSFETs are used at both the high and low ends of the H-bridge. The circuit also provides isolation between the control side and the power side. This circuit can be used in applications such as motor control, power conversion with embedded control interfaces, lighting, audio amplifiers, and uninterruptible power supplies (UPS).

Modern microprocessors and microcontrollers are typically low power and operate with low supply voltages. The source and sink currents of the 2.5 V CMOS logic output range from A to mA. In order to drive a 12 V switching, 4A peak current H-bridge, the interface and level shifting devices must be carefully chosen, especially when low jitter is required.

H-bridge using ADuM7234 isolated half-bridge driver

Power rail filtering and undervoltage lockout protection for the ADuM7234

See the uploading documentation for details (click to download)