Startup Regulator Gate Bias Using Charge Pumped Leakage Current

The patent employs a periodic charging mechanism where a capacitor is charged through the pull-up resistor only during startup transient periods, rather than continuously. The charge pump activates periodically to replenish gate charge, converting the continuous power consumption problem into periodic action that occurs only when needed, thereby dramatically reducing average power consumption while maintaining reliable transistor activation.

The bypass transistor's own gate leakage current is utilized as a useful function rather than treated as a harmful loss. The charge pump captures and recycles this leakage current to maintain the gate voltage, turning the parasitic effect into a self-sustaining mechanism that reduces external power requirements while ensuring continuous transistor operation.

A capacitor is introduced as an intermediary energy storage element between the pull-up resistor and the bypass transistor gate. This capacitor decouples the resistor value from the gate voltage maintenance function, allowing the use of low-resistance values for power consumption reduction while the capacitor maintains adequate voltage levels during startup, thus expanding the usable input voltage range without increasing power dissipation.

The patent changes the operational parameters by introducing a charge pump that actively manages gate voltage. This allows the pull-up resistor to operate at very low resistance values for minimal power consumption, while the charge pump dynamically adjusts gate charging to ensure proper transistor activation across a wide input voltage range, effectively decoupling the resistance value constraints from voltage range limitations.

The patent converts the harmful gate leakage current into a beneficial resource. Rather than eliminating leakage with expensive specialized devices, the charge pump captures the leakage current and recycles it to maintain gate voltage. This transforms the parasitic effect into a self-sustaining feature, eliminating the need for costly HV-MOS devices while reducing overall system complexity and cost.

The charge pump discards the conventional approach of treating gate leakage as waste to be eliminated, instead recovering and recycling the leakage current for useful purposes. By capturing and reuse the leakage current to maintain gate charge, the system eliminates the need for expensive leakage-free devices while maintaining proper transistor operation, thereby reducing both cost and complexity.