US3790822A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit arrangement for the interruption-free switch-over from an operating current supply apparatus to a standby current supply apparatus
Assignee: Siemens AG
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Filing: 1970-12-07
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Granted: 1974-02-05
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Expires: 1990-12-07
Abstract
Abstract A switching circuit for switching a standby power supply into operation when the voltage output from the operating supply drops below a predetermined and adjustable minimum is described. The standby power supply is connected to the consumer apparatus over the emitter-collector path of a transistor. The transistor is rendered conductive in dependence on the voltage from said operating supply and the error signal generated by a supervision system in said operating supply.
Inventors
- 👤 F Giebler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:28
CPC Classifications
H; H02; H02J; H02J9/00; H02J9/04; H02J9/06; H02J9/061; Y; Y02; Y02B; Y02B70/00; Y02B70/30; Y04; Y04S; Y04S20/00; Y04S20/20
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
126 words
Apparatus for switching a consumer apparatus from an operating power supply to a stand-by power supply in an interruption-free manner when the voltage of said operating power supply drops below a predetermined minimum value, comprising: a transistor for switching from the operating power supply to the stand-by power supply and vice versa, means connecting said stand-by power supply to said consumer apparatus over the collector-emitter path of said transistor, amplifier means for controlling said transistor from a nonconductive to a conductive state and vice versa, and means for generating an error signal when the operating supply voltage drops below said predetermined minimum value, said amplifier means including means for controlling the conductivity of said transistor responsive to said operating supply voltage and said error signal voltage.
Claim 2
Dependent Claim
126 words
Apparatus for switching a consumer apparatus from an operating power supply to a stand-by power supply in an interruption-free manner when the voltage of said operating power supply drops below a predetermined minimum value, comprising: a transistor for switching from the operating power supply to the stand-by power supply and vice versa, means connecting said stand-by power supply to said consumer apparatus over the collector-emitter path of said transistor, amplifier means for controlling said transistor from a nonconductive to a conductive state and vice versa, and means for generating an error signal when the operating supply voltage drops below said predetermined minimum value, said amplifier means including means for controlling the conductivity of said transistor responsive to said operating supply voltage and said error signal voltage.
Claim 3
Dependent Claim
40 words
The apparatus described in claim 1, further comprising: first voltage measuring terminal for said error means directly connected to said consumer apparatus, and a second voltage measuring terminal for said standby supply connected to the output of said standby supply.
Claim 4
Dependent Claim
45 words
The apparatus described in claim 1, further comprising: a diode connecting said operating supply to said consumer apparatus, one electrode of said diode being connected to the base of said transistor, the other electrode of said diode being connected to the collector of said transistor.
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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |