Unidirectional TVS Structure for Low Clamping Voltage
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Solution Overview
Problem
Existing transient voltage suppressor (TVS) devices are unable to provide sufficient low clamping voltage during operation, which is crucial for protecting sensitive electronics from high voltage transients such as lightning strikes and electrostatic discharge.
Innovation Solution
A unidirectional transient voltage suppressor device is designed with specific doping regions and layer configurations in a semiconductor substrate, combining a TVS device and a SIDACTor device to achieve a lower clamping voltage while maintaining high peak pulse current and reverse standoff voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing TVS device structures are used, then the device can provide basic voltage suppression functionality, but the clamping voltage remains too high to effectively protect sensitive electronics
Solution Approach 1:
The patent combines a TVS diode and a Zener diode into a single integrated device structure. The TVS diode portion provides fast transient response while the Zener diode portion provides low clamping voltage, achieving effective protection without requiring multiple separate components. This merging resolves the contradiction by integrating multiple functions into one manufacturable device.
Solution Approach 2:
The patent uses a composite semiconductor structure with different doped regions (n-type substrate, p-type first base layer, n-type second base layer, p-type third base layer) to create the combined TVS-Zener functionality. This composite structure enables both fast response and low clamping voltage characteristics that cannot be achieved with a single material type.
2Ease of manufacture
If a simpler single-diode structure is used, then the device is easier to manufacture, but it cannot achieve sufficiently low clamping voltage
Solution Approach 1:
By merging the TVS diode and Zener diode into a single integrated structure with shared electrodes and coupled diodes, the patent achieves low clamping voltage performance comparable to complex multi-component solutions while maintaining a relatively simple single-device manufacturing process.
3Reliability
If the device structure is optimized for low clamping voltage, then protection effectiveness improves, but the device complexity increases
Solution Approach 1:
The patent segments the device into distinct functional regions: a TVS diode portion with its own anode and cathode, and a Zener diode portion with its own anode and cathode. These segmented portions are electrically coupled to achieve the combined functionality, allowing optimization of each region for its specific function while maintaining overall device manageability.
Solution Approach 2:
The multi-layer composite semiconductor structure with specifically engineered doped regions enables low clamping voltage performance. The composite nature of the structure (combining different semiconductor layers and doping profiles) achieves the desired electrical characteristics while providing a unified device architecture.
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 device achieves a substantially reduced clamping voltage, ensuring effective protection against high voltage transients with improved surge performance and efficient current handling capabilities.
Implementation Method 1
Formations of at least one of: the one or more first regions in the second voltage suppression device first base layer and the doping region, and any combination thereof may form one or more NPN configurations of the transient voltage suppression device
Implementation Method 2
The first voltage suppression device substrate may be coupled to the first voltage suppression device first base layer, and to the first voltage suppression device second base layer. The second voltage suppression device substrate may be coupled to the second voltage suppression device first base layer and may be coupled to the second voltage suppression device second and third base layers.
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A transient voltage suppression device, apparatus, structure and associated methods thereof. The device includes a first voltage suppression device having a substrate, a first base layer, and a second base layer. The substrate is coupled to the first base layer, and to the second base layer. The device includes a second voltage suppression device having a substrate, a first base layer, a second base layer, and a third base layer. The second voltage suppression device substrate is coupled to the second voltage suppression device first, second and third base layers. The second voltage suppression device first base layer includes one or more first regions. The second voltage suppression device includes a doping region disposed across at least portions of the second voltage suppression device first base layer and the second voltage suppression device substrate. The first voltage suppression device is coupled to the second voltage suppression device.