Source: https://patents.google.com/patent/US6118641A/en
Timestamp: 2018-04-23 13:56:47
Document Index: 776118263

Matched Legal Cases: ['Application No. 9022236', 'Application No. 9022237', 'Application No. 9022261', 'Application No. 9027111', 'Application No. 9100283', 'Application No. 9114717', 'Application No. 9120727', 'Application No. 9100283']

US6118641A - Overcurrent protection device - Google Patents
Overcurrent protection device Download PDF
US6118641A
US6118641A US08084255 US8425593A US6118641A US 6118641 A US6118641 A US 6118641A US 08084255 US08084255 US 08084255 US 8425593 A US8425593 A US 8425593A US 6118641 A US6118641 A US 6118641A
US08084255
David Mansel Williams
Dennis Malcolm Pryor
In normal operation of the circuit, if there is no current in the line, the switching transistor 1 will be on or off depending on whether battery 3 offsets the transistor gate by more or less than the threshold voltage of the transistor. When the line is loaded the voltage across the switching transistor 1 will increase as the current increases as shown in FIG. 2 curve A, the slope of the curve depending on the switching transistor channel resistance. The voltage will continue to rise with increasing loading of the circuit until the trip voltage VT is reached at which point drain source voltage of the switching transistor 1 is equal to the threshold voltage of the control transistor 4, and the control transistor "shorts" the gate and source terminals of the switching transistor.
By way of comparison the I-V characteristic of a protection arrangement in accordance with German Application No. P 37 25 390 (employing FETs) is shown as curve B. This curve has the same form as curve A but is offset to a higher voltage drop. This is due to the fact that an initial voltage drop VI must occur across the switching transistor before the gate of the control transistor reaches the threshold voltage. The I-V characteristic of a protection arrangement in accordance with German Application No. P 37 05 177 is similar to that of the present invention (curve A) until an overcurrent occurs, whereupon the device latches in its high resistance state with the I-V curve lying on the voltage axis until manually reset.
In use, any voltage that appears across the switching transistor 1 will be multiplied and fed back by the dc-dc converter 71 to offset the gate of switching transistor 1. This has the effect that for all currents up to the trip current the switching transistor has a relatively constant low resistance and has an initial voltage drop (VI in FIG. 2) of zero volts. Resistor 60 prevents the control transistor 4 in its on state from loading the output 58 for the dc-dc converter 71.
US08084255 1991-01-07 1992-01-07 Overcurrent protection device Expired - Lifetime US6118641A (en)
GB9100283A GB9100283D0 (en) 1991-01-07 1991-01-07 Overcurrent protection device
GB9100283 1991-01-07
PCT/GB1992/000027 WO1992012561A1 (en) 1991-01-07 1992-01-07 Overcurrent protection device
US6118641A true US6118641A (en) 2000-09-12
ID=10688058
US08084255 Expired - Lifetime US6118641A (en) 1991-01-07 1992-01-07 Overcurrent protection device
US (1) US6118641A (en)
EP (1) EP0566594B1 (en)
JP (1) JPH06504423A (en)
CA (1) CA2098916A1 (en)
DE (2) DE69219583T2 (en)
GB (1) GB9100283D0 (en)
WO (1) WO1992012561A1 (en)
US20030076644A1 (en) * 2001-10-08 2003-04-24 Bernd Schneider Cable network and method for protecting the cable network against a serial arc
US20080191679A1 (en) * 2006-01-26 2008-08-14 Advanced Analogic Technologies, Inc. High-Frequency Buck Converter that Includes a Cascode MESFET-MOSFET Power Switch
GB9805528D0 (en) * 1998-03-17 1998-05-13 Red Line Power Limited Electronic power supply
"Using UC3840 in Designing a Switching Power Supply", Collection of Transistor Circuit Manufacturing, pp. 150-161. No Date.
"Various Types of Power Supply Protection Circuits", Switching Power Supply Units, Chapter 8, (pp. 209-229). No Date.
British Search Report, Application No. 9022236.5, filed Oct. 12, 1990. *
British Search Report, Application No. 9022237.3, filed Oct. 12, 1990. *
British Search Report, Application No. 9022261.3, filed Oct. 12, 1990. *
British Search Report, Application No. 9027111.5, dated Mar. 26, 1991. *
British Search Report, Application No. 9100283.2, filed Jan. 7, 1991. *
British Search Report, Application No. 9114717.3, filed Jul. 8, 1991. *
British Search Report, Application No. 9120727.4, filed Sep. 30, 1991. *
British Search Report, British Patent Application No. 9100283.2, filed Jan. 7, 1991. *
Erich Gelder and Walter Hirschmann, Siemens Fachbucher, Circuits with Semiconductor Components, vol. 4, pp. 199 202, 1970; a translation of this document is attached. No Month. *
Erich Gelder and Walter Hirschmann, Siemens Fachbucher, Circuits with Semiconductor Components, vol. 4, pp. 199-202, 1970; a translation of this document is attached. No Month.
Horst van Pelka, Siemens Bauteile Informationen , vol. 4, No. 6, 1968, p. 106 (right col.). No Month. *
Horst van Pelka, Siemens-Bauteile-Informationen, vol. 4, No. 6, 1968, p. 106 (right col.). No Month.
International Search Report for PCT/GB92/00027 dated Nov. 13, 1992. *
International Search Report, Application No. PCT/GB91/01760, filed Oct.10, 1991. *
International Search Report, Application No. PCT/GB91/01761, filed Oct. 10, 1991. *
International Search Report, Application No. PCT/GB91/02215, filed Dec. 12, 1991. *
International Search Report, Application No. PCT/GB92/00027, filed Jan. 7, 1992. *
International Search Report, Application No. PCT/GB92/01237, filed Aug. 8, 1992. *
International Search Report, Application No. PCT/GB92/01739, filed Sep. 22, 1992. *
International Search Report, International Application No. PCT/GB92/00027, filed Jan. 7, 1992. *
Using UC3840 in Designing a Switching Power Supply , Collection of Transistor Circuit Manufacturing , pp. 150 161. No Date. *
Various Types of Power Supply Protection Circuits , Switching Power Supply Units , Chapter 8, (pp. 209 229). No Date. *
US6912110B2 (en) * 2001-10-08 2005-06-28 Leoni Bordnetz-Systeme Cable network and method for protecting the cable network against a serial arc
DE69219583D1 (en) 1997-06-12 grant
GB9100283D0 (en) 1991-02-20 grant
WO1992012561A1 (en) 1992-07-23 application
EP0566594A1 (en) 1993-10-27 application
DE69219583T2 (en) 1998-10-08 grant
JPH06504423A (en) 1994-05-19 application
EP0566594B1 (en) 1997-05-07 grant
CA2098916A1 (en) 1992-07-08 application
US6518731B2 (en) 2003-02-11 Devices and methods for protection of rechargeable elements
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ATKINS, IAN PAUL;WILLIAMS, DAVID MANSEL;PRYOR, DENNIS MALCOLM;REEL/FRAME:006755/0886;SIGNING DATES FROM 19930603 TO 19930609