US3710147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transistor switches for high voltage applications
Assignee: Abaco Systems Ltd
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Filing: 1971-06-29
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Granted: 1973-01-09
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Expires: 1991-06-29
Abstract
Abstract A high voltage switch arrangement comprising switches each defined by cascaded transistors connected effectively in the arms of a bridge for switching a high voltage across a capacitive load so that an a.c. voltage is supplied through the load when the bridge is fed from a d.c. source and the switches operated sequentially.
Inventors
- 👤 M Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:28
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/60; H03K17/66; H03K17/661; H03K17/662; H03K17/10; H03K17/665; H03K17/666
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
113 words
An electrical switching arrangement for switching current through a reactive load comprising two serially connected switches each defined by a series of serially connected transistors operatively associated with biassing means and transformer control signal distribution means whereby the contemporaneous switching of said devices from a conductive to a non-conductive state is facilitated, said switches being arranged for switching alternately current through said load, at least some of said transistors being shunted by a capacitor of predetermined value, the capacitance of said capacitors being chosen to be progressively larger towards one end of the said series defining each switch, whereby voltages developed across the said transistors in operation of said arrangement are substantially equalized.
Claim 2
Dependent Claim
113 words
An electrical switching arrangement for switching current through a reactive load comprising two serially connected switches each defined by a series of serially connected transistors operatively associated with biassing means and transformer control signal distribution means whereby the contemporaneous switching of said devices from a conductive to a non-conductive state is facilitated, said switches being arranged for switching alternately current through said load, at least some of said transistors being shunted by a capacitor of predetermined value, the capacitance of said capacitors being chosen to be progressively larger towards one end of the said series defining each switch, whereby voltages developed across the said transistors in operation of said arrangement are substantially equalized.
Claim 3
Dependent Claim
15 words
An arrangement as claimed in claim 1 wherein each transistor is shunted by a resistor.
Claim 4
Dependent Claim
47 words
An electrical switching system including four switch arrangements as claimed in claim 2 connected one in each arm of a four branch circuit the arrangement being such that the supply of pulses of current to a load is facilitated consequent upon sequential operation of the switch arrangement.
Claim 5
Dependent Claim
21 words
An electrical switching system as claimed in claim 3, wherein the four branch circuit is in the form of a bridge.
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) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |