Apparatus and method for temperature-dependent transient blocking
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H02H-005/04
H02H-005/00
출원번호
US-0270874
(2005-11-08)
등록번호
US-7369387
(2008-05-06)
발명자
/ 주소
Harris,Richard A.
Coates,Stephen
Hebert,Francois
출원인 / 주소
FulTec Semiconductor, Inc.
대리인 / 주소
Lumen Patent Firm, Inc.
인용정보
피인용 횟수 :
3인용 특허 :
32
초록▼
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
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.
대표청구항▼
We claim: 1. An apparatus for temperature-dependent transient blocking, said apparatus comprising: a) a transient blocking unit having at least one depletion mode n-channel device interconnected with at least one depletion mode p-channel device such that a transient alters a bias voltage Vp of said
We claim: 1. An apparatus for temperature-dependent transient blocking, said apparatus comprising: a) a transient blocking unit having at least one depletion mode n-channel device interconnected with at least one depletion mode p-channel device such that a transient alters a bias voltage Vp of said depletion mode p-channel device and a bias voltage Vn of said depletion mode n-channel device, whereby said depletion mode p-channel device and said depletion mode n-channel device mutually switch off to block said transient; b) a temperature control unit in communication with said transient blocking unit for adjusting at least one of said bias voltages Vp, Vn in response to a sensed temperature. 2. The apparatus of claim 1, wherein said temperature control unit comprises an element connected in said transient blocking unit for adjusting at least one of said bias voltages Vp, Vn. 3. The apparatus of claim 2, wherein said element comprises a switch for adjusting at least one of said bias voltages Vp, Vn by an open-circuit condition of said switch. 4. The apparatus of claim 2, wherein said element comprises a variable circuit element. 5. The apparatus of claim 4, wherein said variable circuit element is a transistor connected between said at least one depletion mode p-channel device and said at least one depletion mode n-channel device. 6. The apparatus of claim 5, wherein said at least one depletion mode p-channel device comprises a PJFET and said at least one depletion mode n-channel device comprises a MOSFET and said transistor is connected between sources of said PJFET and said MOSFET. 7. The apparatus of claim 4, wherein said variable circuit element is selected from the group consisting of resistors, transistors, positive temperature coefficient thermistors, positive temperature coefficient elements, negative temperature coefficient elements, current-limiters and diodes. 8. The apparatus of claim 2, wherein said element comprises a temperature-sensitive element for measuring said sensed temperature in a local area. 9. The apparatus of claim 1, wherein said temperature control unit-comprises a remote temperature sensor for measuring said sensed temperature in a remote area. 10. The apparatus of claim 1, wherein said transient blocking unit and said temperature control unit are integrated. 11. An apparatus for temperature-dependent transient blocking, said apparatus comprising a transient blocking unit having at least two depletion mode n-channel devices and a positive temperature coefficient thermistor interconnected with said at least two depletion mode n-channel devices such that a transient alters a resistance of said positive temperature coefficient thermistor and a bias voltage Vn of said depletion mode n-channel devices, whereby said depletion mode n-channel devices and said positive temperature coefficient thermistor mutually switch off to block said transient. 12. The apparatus of claim 11, further comprising a temperature control unit in communication with said positive temperature coefficient thermistor for performing adjustments. 13. The apparatus of claim 11, further comprising a temperature control unit in communication with said transient blocking unit for adjusting said bias voltage Vn. 14. The apparatus of claim 11, wherein said at least two depletion mode n-channel devices and said positive temperature coefficient thermistor are in thermal contact. 15. The apparatus of claim 11, wherein said at least two depletion mode n-channel devices comprise at least one MOSFET. 16. A method for temperature-dependent transient blocking comprising: a) providing a transient blocking unit having at least one depletion mode n-channel device interconnected with at least one depletion mode p-channel device such that a transient alters a bias voltage Vp of said depletion mode p-channel device and a bias voltage Vn of said depletion mode n-channel device, whereby said depletion mode p-channel device and said depletion mode n-channel device mutually switch off to block said transient; b) measuring a sensed temperature; and c) adjusting at least one of said bias voltages Vp, Vn in response to said sensed temperature. 17. The method of claim 16, wherein said sensed temperature is measured in a local area. 18. The method of claim 16, wherein said sensed temperature is measured in a remote area. 19. The method of claim 16, wherein said sensed temperature is measured by a temperature-sensitive element. 20. The method of claim 19, wherein said transient blocking unit and said temperature-sensitive element are integrated. 21. A method for temperature-dependent transient blocking comprising: a) providing a transient blocking unit having at least two depletion mode n-channel devices and a positive temperature coefficient thermistor; b) interconnecting said at least two depletion mode n-channel devices such that a transient alters a resistance of said positive temperature coefficient thermistor and a bias voltage Vn of said depletion mode n-channel devices, whereby said depletion mode n-channel devices and said positive temperature coefficient thermistor mutually switch off to block said transient. 22. The method of claim 21, further adjusting said bias voltage Vn in response to a sensed temperature. 23. The method of claim 21, further comprising placing said positive temperature coefficient thermistor in thermal contact with said at least two depletion mode n-channel devices. 24. The method of claim 23, wherein said placing in thermal contact comprises sandwiching.
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