Overvoltage Protection Device Using Break-Over Diode and Reset Switch
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Solution Overview
Problem
Existing overvoltage protection devices for power supply lines face challenges with size and cost due to the need for large avalanche diodes for high voltages, while break-over components are unsuitable for DC power supply lines as they remain conductive after an overvoltage event.
Innovation Solution
An overvoltage protection device comprising a break-over diode in series with an avalanche diode and a control circuit that turns on a switch after an overvoltage is detected, allowing the device to reset, reducing the overall surface area and cost by using a smaller break-over diode and a low-on-state-resistance switch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If avalanche diode type protection component is used, then overvoltage protection is provided for power supply lines, but component size becomes large and cost increases
Solution Approach 1:
The protection function is divided between a break-over diode (providing voltage clamping) and a parallel switch (providing low-impedance discharge path). This segmentation allows each component to be optimized independently, with the break-over diode being much smaller than a full avalanche diode would require for the same power handling capability.
Solution Approach 2:
The patent introduces dynamic control of the switch impedance state. The switch transitions from high impedance (normal operation) to low impedance (overvoltage condition) dynamically, allowing the protection mechanism to adapt to different operating conditions and reduce the required size of protection components.
2Area of stationary object
If break-over type protection component is used, then component size is reduced, but component remains conductive after overvoltage event for DC power supply lines
Solution Approach 1:
The control circuit monitors the voltage across the break-over diode and the state of the switch, using this feedback to determine when to transition the switch from low to high impedance state. This feedback mechanism ensures the protection device resets appropriately after an overvoltage event, maintaining reliability for DC power supply lines.
Solution Approach 2:
The protection device automatically resets itself after an overvoltage event through the control circuit's autonomous detection and switching actions. The system self-manages the transition from protection mode to normal operation mode without external intervention, ensuring continuous protection capability.
3Area of stationary object
If break-over diode is used with DC power supply line, then smaller component size is achieved, but device cannot reset after overvoltage due to sustained positive voltage
Solution Approach 1:
The control circuit acts as an intermediary between the break-over diode and the switch, managing the complex reset logic required for DC power supply lines. It monitors system state and coordinates the switching actions needed to enable protection reset, bridging the gap between the simple break-over diode and the requirement for sustained protection capability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables the use of smaller, less expensive protection devices for power supply lines by ensuring the switch turns off after an overvoltage event, reducing the total surface area and maintaining protection for voltages between 50 and 1000 volts.
Implementation Method 1
An overvoltage protection device is a component or circuit which turns on when the voltage thereacross exceeds a given threshold, called breakdown voltage, and generally designated as VBR
Implementation Method 2
When the voltage across this component exceeds breakdown voltage VBR, the component turns on... a current I of strong value crosses the component
Data Source
AI summary
An overvoltage protection device capable of protecting a power supply line and including in parallel a break-over diode, a controlled switch, and a circuit for controlling the switch.