Temperature-Dependent Transient Blocking Unit for Sensitive Circuits
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Solution Overview
Problem
Existing protection circuits for sensitive electronics fail to simultaneously protect against over-voltage, over-current, and over-temperature, which are critical for maintaining performance and preventing damage in sensitive circuits like those used in telecommunications.
Innovation Solution
A temperature-dependent transient blocking unit (TBU) is developed, utilizing interconnected depletion mode n-channel and p-channel devices, along with a temperature control unit that adjusts bias voltages in response to sensed temperature, ensuring simultaneous protection against transients, over-voltage, and over-current, while being simple in construction and highly integrable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional protection circuits are used, then protection against over-voltage or over-current is provided, but protection against over-temperature is not provided simultaneously
Solution Approach 1:
The transient blocking unit is designed to perform multiple protection functions simultaneously - blocking voltage transients, limiting current, and providing thermal protection through temperature-dependent bias voltage adjustment, making a single circuit serve multiple protective roles
2Reliability
If multiple separate protection circuits are used for over-voltage, over-current and over-temperature protection, then comprehensive protection is achieved, but device complexity increases
Solution Approach 1:
The patent combines transient blocking, current limiting, and thermal protection functions into a single integrated circuit unit. The temperature control unit modifies the bias voltages of the depletion mode devices to achieve thermal protection while the same devices provide transient and current protection, merging multiple protection functions into one compact structure
Solution Approach 2:
The depletion mode n-channel and p-channel devices serve multiple functions: they block voltage transients, limit current, and their operation is modulated by temperature through the temperature control unit, allowing one set of devices to perform multiple protective roles simultaneously
3Reliability
If sensitive circuits are protected with conventional fuses or protection circuits, then basic protection is provided, but stringent requirements of sensitive circuits are not satisfied
Solution Approach 1:
The protection circuit dynamically adjusts its characteristics based on temperature through the temperature control unit. The bias voltages of the depletion mode devices are continuously modulated according to temperature, allowing the circuit to adapt its protection behavior to thermal conditions while maintaining sensitivity requirements
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 effectively blocks transients and shuts off in response to temperature, providing comprehensive protection that meets stringent requirements for sensitive circuits, ensuring reliable operation and preventing damage from combined over-voltage, over-current, and over-temperature conditions.
Implementation Method 1
a transient alters a bias voltage Vp of the p-channel device and a bias voltage Vn of the n-channel device in concert. Specifically, the bias voltages are altered such that the p-channel device and n-channel device mutually switch off to block the transient
Implementation Method 2
a temperature control unit that is in communication with the TBU and adjusts at least one of the bias voltages Vp, Vn in response to a sensed temperature
Data Source
AI summary
An apparatus and method for temperature-dependent transient blocking employing a transient blocking unit (TBU) that uses at least one depletion mode n-channel device interconnected with at least one depletion mode p-channel device. The interconnection is performed such that a transient alters a bias voltage Vp of the p-channel device and a bias voltage Vn of the n-channel device in concert to effectuate their mutual switch off to block the transient. The apparatus has a temperature control unit that is in communication with the TBU and adjusts at least one of the bias voltages Vp, Vn in response to a sensed temperature Ts, thereby enabling the apparatus to also respond to over-temperature. In some embodiments the p-channel device is replaced with a positive temperature coefficient thermistor (PTC). The temperature control unit can use any suitable circuit element, including, among other a PTC, resistor, negative temperature coefficient element, positive temperature coefficient element, transistor, diode.