EP0112119A2
Expired / Lapsed
EP
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Bridge rectifier circuit
Assignee: Siliconix Ltd
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Filing: 1983-12-06
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Granted: —
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Expires: 2003-12-06
Abstract
Abstract A bridge rectifier circuit comprises a bridge of switching transistors 1 to 4 having their control terminals connected to switch the transistors to provide either full wave rectification of an a.c. input voltage or polarity correction of a d.c. input voltage of either polarity appearing at terminals A and B. The switching transistors are all of the same polarity type and at least two floating drivers 6 and 7 are connectd to generate and supply control potentials to the control terminals respectively of a pair of the switching transistors. In a preferred embodiment the switching transistors comprise field effect transistors. The floating drivers can comprise at least one respective bridge rectifier 12 capacitively linked to a source of vol ie pulses 10 when the input voltage has a predetermined poiarity, to generate the control potentials. Alternatively the floating drivers can comprise a voltage doubler or quadrupler capacitively linked to the source of voltage pulses. Such bridge rectifier circuits can be employed in a telephone instrument.
Inventors
- 👤 James Oliver Michael Jenkins
- 👤 Nigel Carrington Gardner
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 19:32
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/02; H02M7/04; H02M7/12; H02M7/21; H02M7/217; H02M7/219; H02M7/2195; Y; Y02; Y02B; Y02B70/00; Y02B70/10
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
76 words
A bridge rectifier circuit comprising a bridge of switching transistors having their control terminals connected to switch the transistors to provide either full wave rectification of an a.c. input voltage or polarity connection of a d.c. input voltage of either polarity, the switching transistors being all of the same polarity type, and at least two floating drivers connected to generate and supply control potentials to the control terminals respectively of a pair of the switching transistors.
Claim 2
Dependent Claim
76 words
A bridge rectifier circuit comprising a bridge of switching transistors having their control terminals connected to switch the transistors to provide either full wave rectification of an a.c. input voltage or polarity connection of a d.c. input voltage of either polarity, the switching transistors being all of the same polarity type, and at least two floating drivers connected to generate and supply control potentials to the control terminals respectively of a pair of the switching transistors.
Claim 3
Dependent Claim
15 words
A rectifier circuit according to claim 1 wherein the switching transistors comprise field effect transistors.
Claim 4
Dependent Claim
41 words
A rectifier circuit according to claim 1 or 2 wherein the floating drivers comprise at least one respective bridge rectifier cacapitively linked to a source of voltage pulses when the input voltage has a pre-determined polarity, to generate said control potentials.
Claim 5
Dependent Claim
41 words
A rectifier circuit according to Claim 1 or 2 wherein the floating driver comprises a voltage . doubler or quadrupler capacitatively linked to a source of voltage pulses when the input voltage has a predetermined polarity to generate said control potentials.
Claim 6
Dependent Claim
26 words
A rectifier circuit according to Claim 4 wherein the voltage doubler or quadrupler comprise a network of diodes and capacitors arranged to form a diode pump.
Claim 7
Dependent Claim
23 words
A rectifier circuit according to any preceding claim wherein all of the switching transistors respectively have their control terminals connected to floating drivers.
Claim 8
Dependent Claim
13 words
A telephone instrument including a bridge rectifier circuit according to any preceding claim.
Claim 9
Dependent Claim
50 words
A telephone instrument according to claim 7, the rectifier circuit providing a DC supply for electronic circuitry within the instrument, and including an isolating switch arranged to isolate the DC output of the rectifier circuit from the circuitry in the instrument in response to dialling signals generated in the instrument.
Claim 10
Dependent Claim
73 words
9 . A telephone instrument according to claim 8, wherein the isolating switch comprises a switching transistor in series with the DC output of the rectifier circuit, and a floating driver connected to supply a control potential across the control terminals of the switching transistor, said floating driver being responsive to a control signal produced by the telephone instrument to indicate that dialling signals are being generated, to turn off the switching transistor.
Claim 11
Dependent Claim
31 words
A telephone instrument according to claim 9, wherein the floating driver comprises a bridge rectifier capacitively linked to a source of voltage pulses only in the absence of the control signal.
Claim 12
Dependent Claim
34 words
ll. A telephone instrument according to Claim 9 wherein the floating driver comprises a voltage doubler or quadrupler capacitively linked to a source of voltage pulses only in the absence of the control signal.
Claim 13
Dependent Claim
26 words
A telephone instrument according to Claim 11 wherein the voltage doubler or quadrupler comprise a network of diodes and capacitors arranged to form a diode pump.
Claim 14
Dependent Claim
57 words
A rectifier circuit comprising a bridge of switching transistors having their control terminals connected to switch the transistors to provide full wave rectification of either an a.c input voltage or a changing polarity d.c input voltage, respective transistors having their control terminals connected to respective independant floating drivers which generate and supply control potentials to said terminals.
Claim 15
Dependent Claim
57 words
A rectifier circuit comprising a bridge of switching transistors having their control terminals connected to switch the transistors to provide full wave rectification of either an a.c input voltage or a changing polarity d.c input voltage, respective transistors having their control terminals connected to respective independant floating drivers which generate and supply control potentials to said terminals.
References Cited (Backward Citations)
No citation records indexed.
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