High Voltage Clamps with Transient Activation Control
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Solution Overview
Problem
Electronic systems face damage from transient overstress events like electrostatic discharge (ESD) due to high power dissipation, leading to issues such as gate oxide punch-through and junction damage, as existing protection methods may not turn on quickly enough or shut down properly to prevent false triggering.
Innovation Solution
An actively-controlled high voltage clamp with a scalable operating clamping voltage level, featuring an isolation circuit, active clamp control circuit, and a timer for controlled activation and deactivation, which detects transient overstress events and provides low impedance between power supply and ground nodes to prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protection clamp is used to protect against transient overstress events, then reliability is improved, but device complexity increases due to the need for active control circuits, isolation circuits, and timer mechanisms
Solution Approach 1:
The protection system is divided into distinct functional modules: an isolation circuit that separates the high-voltage detection domain from the low-voltage control domain, an active clamp control circuit that processes detection signals and generates control signals, and a timer that manages activation duration. This segmentation allows each module to be optimized independently while working together to provide comprehensive protection.
Solution Approach 2:
The isolation circuit acts as an intermediary between the high-voltage power supply nodes and the low-voltage control circuitry. It transfers voltage information from the high-voltage domain to the low-voltage domain without direct electrical connection, enabling safe monitoring of overstress conditions while protecting the control circuit from high-voltage damage.
2Speed
If the clamp activates quickly to protect against transient events, then protection effectiveness is improved, but false triggering during normal operation increases
Solution Approach 1:
The isolation circuit continuously monitors the voltage between power supply nodes before a transient event occurs, maintaining readiness to detect overstress conditions. The active clamp control circuit is pre-configured with detection thresholds and control logic, enabling immediate response when voltage exceeds safe levels without requiring additional processing delay.
Solution Approach 2:
The clamp's impedance is dynamically adjusted based on detected voltage conditions. During normal operation, the clamp maintains high impedance to avoid interference. When a transient overstress event is detected, the clamp rapidly switches to low impedance to divert the transient current, then returns to high impedance after the timer expires, adapting its state to operational requirements.
3Reliability
If the clamp remains activated to ensure continuous protection, then reliability is improved, but power consumption increases and normal circuit operation is interfered with
Solution Approach 1:
The timer implements periodic control by activating the clamp for a predetermined time duration after detecting an overstress event, then deactivating it. This periodic activation pattern provides protection during and immediately after transient events while allowing normal circuit operation to resume, balancing protection needs with power consumption and circuit functionality.
Data Source
AI summary
High voltage clamps with transient activation and activation release control are provided herein. In certain configurations, an integrated circuit (IC) includes a clamp electrically connected between a first node and a second node and having a control input. The IC further includes a first resistor-capacitor (RC) circuit that activates a detection signal in response to detecting a transient overstress event between the first node and the second node, an active feedback circuit that provides feedback from the first node to the control input of the clamp in response to activation of the detection signal, a second RC circuit that activates a shutdown signal after detecting passage of the transient overstress event based on low pass filtering a voltage difference between the first node and the second node, and a clamp shutdown circuit that turns off the clamp via the control input in response to activation of the shutdown signal.