Transformer-Isolated Gate Driving Circuit for Lower-Voltage Processes

The device is divided into two isolated circuit systems (primary and secondary) with different voltage requirements. The primary circuit system uses high-withstand-voltage processes for components exposed to high voltages, while the secondary circuit system uses common low-to-middle-withstand-voltage processes. This segmentation allows each part to be optimized independently, improving overall reliability while reducing manufacturing complexity by avoiding the need to apply high-withstand-voltage processes to the entire device.

A transformer is introduced as an intermediary component between the primary and secondary circuit systems. The transformer provides galvanic isolation, allowing voltage signals to be transmitted from the high-voltage primary side to the low-voltage secondary side without direct electrical connection. This intermediary enables the secondary circuit to operate at lower voltages with simpler processes while still achieving the required voltage levels for driving power transistors.

The device is segmented into two functionally distinct circuit systems with different voltage requirements. The primary circuit system handles high-voltage signals and uses high-withstand-voltage processes, while the secondary circuit system handles low-voltage control signals and uses common processes. This segmentation reduces device complexity by allowing each segment to be designed and manufactured with appropriate process complexity rather than requiring the entire device to use complex high-withstand-voltage processes.

The transformer acts as an intermediary that enables reliable signal transmission from the primary to secondary circuit system without requiring the secondary side to withstand high voltages. This isolation means that only the primary circuit components need high-withstand-voltage processes, reducing overall process complexity while maintaining signal transmission reliability.

The device is divided such that only the primary circuit system components that are directly exposed to high voltages use high-withstand-voltage processes. The secondary circuit system components can use common low-to-middle-withstand-voltage processes since they operate at lower voltages. This selective application of processes improves ease of manufacture for the majority of components while maintaining sufficient withstand voltage capability where needed.

The transformer provides galvanic isolation that protects the secondary circuit system from high voltages. This intermediary allows the secondary side to use common manufacturing processes with lower withstand voltage capabilities, improving ease of manufacture, while the primary side maintains high-withstand-voltage capability to handle the high voltage signals from power transistors.