Patent US4459498A successfully refreshed from Google Patents.
US4459498A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switch with series-connected MOS-FETs
Assignee: Siemens AG
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Filing: 1981-06-26
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Granted: 1984-07-10
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Expires: 2001-06-26
Abstract
Abstract Switch with at least two series-connected MOS-FETs has a drain terminal of a preceding MOS-FET connected to a source terminal of a succeeding MOS-FET the MOS-FETs having respective control terminals connectible to a control voltage. The control terminal of the preceding MOS-FET is directly connected to a terminal of the control voltage source. The control terminal of the succeeding MOS-FET is connected to the control terminal of the respective preceding MOS-FET via a diode poled in forward direction with respect to the control voltage source. A resistor is connected between the control terminal and the source terminal of the succeeding MOS-FET.
Inventors
- 👤 Jens-Peer Stengl
- 👤 Hartmut Thomas
- 👤 Jeno Tihanyi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:08
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/10; H03K17/102
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
179 words
Switch with at least two series-connected MOS-FETs, wherein a drain terminal of a preceding MOS-FET is connected to a source terminal of a succeeding MOS-FET, and the MOS-FETs have respective control terminals connectible to a control voltage source, comprising means for directly connecting the control terminal of the preceding MOS-FET to a terminal of the control voltage source; means for connecting the control terminal of the succeeding MOS-FET to the control terminal of the respective preceding MOS-FET via a diode poled in forward direction with respect to the control voltage source; a resistor connected between the control terminal and the source terminal of the succeeding MOS-FET; and a Zener diode connected between the control terminal and the drain terminal of the succeeding FET, said Zener diode being poled in cut-off direction with respect to the drain-source voltage source, said Zener diode having a Zener voltage which is lower than the cut-off voltage of the succeeding FET, said Zener diode being connected in series with a further diode having a flow direction which is opposite that of said Zener diode.
Claim 2
Dependent Claim
179 words
Switch with at least two series-connected MOS-FETs, wherein a drain terminal of a preceding MOS-FET is connected to a source terminal of a succeeding MOS-FET, and the MOS-FETs have respective control terminals connectible to a control voltage source, comprising means for directly connecting the control terminal of the preceding MOS-FET to a terminal of the control voltage source; means for connecting the control terminal of the succeeding MOS-FET to the control terminal of the respective preceding MOS-FET via a diode poled in forward direction with respect to the control voltage source; a resistor connected between the control terminal and the source terminal of the succeeding MOS-FET; and a Zener diode connected between the control terminal and the drain terminal of the succeeding FET, said Zener diode being poled in cut-off direction with respect to the drain-source voltage source, said Zener diode having a Zener voltage which is lower than the cut-off voltage of the succeeding FET, said Zener diode being connected in series with a further diode having a flow direction which is opposite that of said Zener diode.
Claim 3
Dependent Claim
53 words
Switch according to claim 1, including further succeeding MOS-FETs with a Zener diode respectively connected between the control terminal and the respective drain terminal of each of said further succeeding MOS-FETs, said Zener diode being serially connected with a further diode having a flow direction which is opposite that of said Zener diode.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-10 | 1988-01-09 | 1988-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-10 | 1992-01-09 | 1992-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-10 | 1996-01-09 | 1996-07-10 | $7700.00 | Window Closed / Lapsed |