Circuit Device Overvoltage Protection for N-type Transistor
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Solution Overview
Problem
Existing power supply circuits fail to protect both the load and the power transistor from overvoltage conditions, leading to potential transistor failure and disruption in load operation.
Innovation Solution
A circuit device that includes a regulator, a charge pump circuit, an overvoltage detection circuit, and a control circuit to regulate and monitor the power supply voltage, detect overvoltage conditions, and stop the charge pump operation to prevent overvoltage damage to the N-type transistor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the charge pump circuit continues operating during overvoltage conditions to maintain gate control voltage, then the load operation continues without interruption, but the N-type transistor may fail due to overvoltage
Solution Approach 1:
The patent applies preliminary anti-action by detecting overvoltage conditions before they can cause damage to the power transistor. The overvoltage detection circuit monitors the gate node voltage in advance and triggers the protection function preemptively, stopping the charge pump before the voltage reaches levels that would harm the transistor, thus preventing rather than reacting to damage
Data Source
AI summary
A circuit device includes a regulator, a charge pump circuit, an overvoltage detection circuit, and a control circuit. The regulator regulates a power supply voltage. The charge pump circuit outputs, a gate control voltage, to a gate node of an N-type transistor provided between a power supply node and a load, based on a regulated voltage. The overvoltage detection circuit detects an overvoltage of the regulated voltage. The control circuit controls to stop the charge pump circuit when the overvoltage is detected by the overvoltage detection circuit.