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US4591964A
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Method of securely interrupting the electric power supply from a low-frequency or direct voltage source to a load, and appartus for carrying out the method
Assignee: Telefonaktiebolaget LM Ericsson AB
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Filing: 1983-01-26
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Granted: 1986-05-27
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Expires: 2003-01-26
Abstract
Abstract The invention relates to a method and an apparatus for secure interruption of the supply of electric power from e.g. a low-frequency source (1) to a signal lamp (2) which when alight announces permission for a train to pass. The output voltage (a) of the source (1) is chopped by a chopper device (4) to a high-frequency alternating voltage (e,f) in response to a high-frequency input signal (b) to the chopper device (4) and is transferred from the primary to the secondary side of a transformer (5,6) as well as being rectified and filtered to form a voltage (k) applied to the signal lamp (2), said voltage (k) having a wave form corresponding to the wave form of the output voltage (a) of the source (1) and which is securely interrupted by interrupting the input signal (b) to the chopper device (4).
Inventors
- 👤 Clas A. Kemstedt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:04
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/02; H02M7/04; H02M7/12; H02M7/21; H02M7/217; H02M7/2173; B; B61; B61L; B61L5/00; B61L5/12; B61L5/18; B61L5/1809; B61L5/1881; G; G08; G08G; G08G1/00; G08G1/097; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/33569; H02M3/33576; H02M3/33592; Y; Y02; Y02B; Y02B70/00; Y02B70/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
186 words
Method of reliably controlling the energizing of a load comprising providing a source voltage having a low frequency or direct-current voltage, controllably providing a chopping voltage having a frequency substantially greater than said low frequency, said chopping voltage being controllably switchable between on and off states, chopping said source voltage in response to said chopping voltage such that, when said chopping voltage is present, a high-frequency voltage is generated, inductively coupling said high-frequency voltage to an output circuit containing said load solely through a high-frequency path with galvanic isolation and rectifying and filtering the high-frequency voltage induced in said output circuit such that when the chopping voltage is in on state the load will be supplied with voltage corresponding to voltage from said source whereas when the chopping voltage is in off state no leakage voltage can be transmitted across said inductive coupling and there will be no voltage at said load whereby to reliably interrupt supply of voltage to said load and when the source voltage has a low frequency, the voltage applied to the load has substantially the same waveform as the source voltage.
Claim 2
Dependent Claim
186 words
Method of reliably controlling the energizing of a load comprising providing a source voltage having a low frequency or direct-current voltage, controllably providing a chopping voltage having a frequency substantially greater than said low frequency, said chopping voltage being controllably switchable between on and off states, chopping said source voltage in response to said chopping voltage such that, when said chopping voltage is present, a high-frequency voltage is generated, inductively coupling said high-frequency voltage to an output circuit containing said load solely through a high-frequency path with galvanic isolation and rectifying and filtering the high-frequency voltage induced in said output circuit such that when the chopping voltage is in on state the load will be supplied with voltage corresponding to voltage from said source whereas when the chopping voltage is in off state no leakage voltage can be transmitted across said inductive coupling and there will be no voltage at said load whereby to reliably interrupt supply of voltage to said load and when the source voltage has a low frequency, the voltage applied to the load has substantially the same waveform as the source voltage.
Claim 3
Dependent Claim
191 words
Apparatus for reliably effecting interruption of the supply of electric power from a low-frequency or direct-current voltage source to a load comprising high-frequency voltage generating means for generating a high-frequency control voltage, said high-frequency voltage generating means being controllably switchable between on and off states, high-frequency control voltage responsive chopper means for chopping the output voltage of said voltage source to a high-frequency output voltage only when said high-frequency control voltage is present, and galvanically isolating high-frequency coupling means for coupling said high-frequency output voltage to said load, said high-frequency coupling means comprising a transformer means and rectifier and filtering means connecting said transformer means to said load whereby the voltage applied to said load has the same waveform as said voltage source so that when said high-frequency voltage generating means is in on state, the load will be supplied with voltage corresponding to voltage from said source whereas when said high-frequency voltage generating means is in off state no voltage, inclusive of leakage voltage, can be transmitted across said transformer means and there will be no voltage at said load whereby to reliably interrupt supply of voltage to said load.
Claim 4
Dependent Claim
191 words
Apparatus for reliably effecting interruption of the supply of electric power from a low-frequency or direct-current voltage source to a load comprising high-frequency voltage generating means for generating a high-frequency control voltage, said high-frequency voltage generating means being controllably switchable between on and off states, high-frequency control voltage responsive chopper means for chopping the output voltage of said voltage source to a high-frequency output voltage only when said high-frequency control voltage is present, and galvanically isolating high-frequency coupling means for coupling said high-frequency output voltage to said load, said high-frequency coupling means comprising a transformer means and rectifier and filtering means connecting said transformer means to said load whereby the voltage applied to said load has the same waveform as said voltage source so that when said high-frequency voltage generating means is in on state, the load will be supplied with voltage corresponding to voltage from said source whereas when said high-frequency voltage generating means is in off state no voltage, inclusive of leakage voltage, can be transmitted across said transformer means and there will be no voltage at said load whereby to reliably interrupt supply of voltage to said load.
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) | 1989-05-26 | 1989-11-25 | 1990-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-26 | 1993-11-25 | 1994-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-26 | 1997-11-25 | 1998-05-27 | $7700.00 | Window Closed / Lapsed |