Power Device Drive Apparatus Open-Loop Voltage Control

The patent extracts and eliminates the feedback peripheral circuit (photocoupler or auxiliary winding) from the system by implementing open-loop control. The control unit directly generates control signals based on detected supply voltage without requiring secondary side voltage feedback, thereby removing the costly feedback components while maintaining acceptable power supply stability through direct primary side voltage control.

The control unit performs self-service by detecting the supply voltage and autonomously generating appropriate control signals based on stored correspondence relationships. This self-regulating mechanism eliminates the need for external feedback circuits, as the system uses its own internal detection and control capabilities to maintain stable operation without additional peripheral components.

The patent removes the expensive feedback peripheral circuits (photocouplers or auxiliary windings) from the manufacturing bill of materials. By implementing open-loop control where the control unit directly generates control signals based on primary side voltage detection, the system eliminates these costly components while maintaining acceptable power supply stability, thereby reducing manufacturing costs.

The patent replaces expensive, complex feedback components with simpler, cheaper alternatives. The control unit uses basic voltage detection and lookup table-based control signal generation instead of costly photocouplers or auxiliary windings, effectively substituting expensive components with cheaper solutions that achieve the same functional outcome of maintaining power supply stability.

The control unit performs preliminary action by pre-storing correspondence relationships between supply voltages and control signal set values in a lookup table. When voltage fluctuation occurs, the control unit can immediately retrieve and apply the appropriate control signal without waiting for feedback processing, thereby maintaining power supply stability while achieving fast responsiveness through advance preparation of control data.

The patent implements a form of feedback through the control unit's continuous monitoring of supply voltage and automatic adjustment of control signals based on stored correspondence relationships. Although this is technically open-loop control without secondary side feedback, it achieves feedback-like functionality by using real-time voltage detection and pre-programmed control strategies, providing both stability and responsiveness.