Voltage-Divided Power Supply Circuit for Compact Isolated Control Power

The patent extracts the insulation function from the transformer and implements it through circuit topology design. By connecting voltage division capacitors in series and using switches to control power transfer between them, the system achieves potential difference isolation without requiring a physical transformer, thereby reducing circuit size while maintaining insulation reliability.

The patent introduces voltage division capacitors and switching elements as intermediary components between the high-voltage main circuit and the low-voltage control circuit. These intermediaries enable controlled power transfer and potential isolation without direct electrical connection, replacing the transformer's insulation function with a more compact switching circuit architecture.

The patent implements self-service by enabling voltage division capacitors to transfer power to each other through controlled switching. Instead of relying on external resistors to discharge or control voltage, the system uses its own capacitive elements and switching network to dynamically balance voltages and transfer energy, eliminating continuous resistive losses while maintaining voltage control.

The patent employs periodic switching actions to transfer power between voltage division capacitors in discrete cycles. This periodic power transfer mechanism replaces continuous resistive discharge with intermittent energy redistribution, achieving voltage control only when needed while minimizing energy loss during non-operating periods.