US4740879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blocking oscillator switched power supply with standby circuitry
Assignee: Siemens AG
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Filing: 1986-10-17
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Granted: 1988-04-26
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Expires: 2006-10-17
Abstract
Abstract A circuit for providing standby operation in a switched power supply with a blocking oscillator, includes a control circuit, an electronic switch driven by the control circuit, and a transformer having a primary winding connected in series with the electronic switch, a first secondary winding supplying power supply to a normal load of electrical equipment, a second secondary winding driving the control circuit, and a further transformer winding strongly coupled to the primary winding and loosely coupled to the first secondary winding for generating a control signal for a standby load supply.
Inventors
- 👤 Gunther Peruth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:10
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/33507; H02M3/33523; H02M1/00; H02M1/0003; H02M1/0032; Y; Y02; Y02B; Y02B70/00; Y02B70/10
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
135 words
Circuit for providing standby operation in a switched power supply with a blocking oscillator, comprising a control circuit, an electronic switch driven by said control circuit, and a transformer having a primary winding connected in series with said electronic switch, a first secondary winding supply power supply to a normal load of electrical equipment, a second secondary winding driving said control circuit, a further transformer winding strongly coupled to said primary winding and loosely coupled to said first secondary winding for generating a control signal for a standby load supply, and a switch connected to said first secondary winding, to said normal load, and to a further standby load and controlled by said further transformer winding for decoupling the normal load from said first secondary winding as well as for supplying the further standby load.
Claim 2
Dependent Claim
135 words
Circuit for providing standby operation in a switched power supply with a blocking oscillator, comprising a control circuit, an electronic switch driven by said control circuit, and a transformer having a primary winding connected in series with said electronic switch, a first secondary winding supply power supply to a normal load of electrical equipment, a second secondary winding driving said control circuit, a further transformer winding strongly coupled to said primary winding and loosely coupled to said first secondary winding for generating a control signal for a standby load supply, and a switch connected to said first secondary winding, to said normal load, and to a further standby load and controlled by said further transformer winding for decoupling the normal load from said first secondary winding as well as for supplying the further standby load.
Claim 3
Dependent Claim
28 words
Circuit according to claim 1, including a comparator stage coupled to said further transformer winding, to a reference, and to the standby load for supplying the standby load.
Claim 4
Dependent Claim
75 words
Circuit according to claim 2, wherein said control circuit includes a pulse width modulator, a control voltage generator, and an overload amplifier, said overload amplifier being driven by said control voltage generator when the normal load is decoupled and said overload amplifier in turn controlling said pulse width modulator for driving said electronic switch for generating a pulse-shaped control signal with a duty cycle of substantially 1:100 and a frequency above a given audibility limit.
Claim 5
Dependent Claim
39 words
Circuit according to claim 2, wherein said switch is connected to said comparator stage, said comparator stage controlling said switch for decoupling the normal load from said first secondary winding as well as for supplying the further standby load.
Claim 6
Dependent Claim
76 words
Circuit according to claim 4, wherein said control circuit includes a pulse width modulator, a control voltage generator, and an overload amplifier, said overload amplifier being driven by said control voltage generator when the normal load is decoupled and said overload amplifier in turn controlling said pulse width modulator for driving said electronic switch for generating a pulse-shaped control signal with a duty cycle of less than 1:10 and a frequency above a given audibility limit.
Claim 7
Dependent Claim
113 words
Circuit for providing standby operation in a switched power supply with a blocking oscillator, comprising a control circuit, an electronic switch driven by said control circuit, and a transformer having a primary winding connected in series with said electronic switch, a first secondary winding supplying power supply to a normal load of electrical equipment, a second secondary winding driving said control circuit, a further transformer winding strongly coupled to said primary winding and loosely coupled to said first secondary winding for generating a control signal for a standby load supply, and a comparator stage coupled to said further transformer winding, to a reference, and to the standby load for supplying the standby load.
Claim 8
Dependent Claim
113 words
Circuit for providing standby operation in a switched power supply with a blocking oscillator, comprising a control circuit, an electronic switch driven by said control circuit, and a transformer having a primary winding connected in series with said electronic switch, a first secondary winding supplying power supply to a normal load of electrical equipment, a second secondary winding driving said control circuit, a further transformer winding strongly coupled to said primary winding and loosely coupled to said first secondary winding for generating a control signal for a standby load supply, and a comparator stage coupled to said further transformer winding, to a reference, and to the standby load for supplying the standby load.
Claim 9
Dependent Claim
53 words
Circuit according to claim 6, including a switch connected to said second primary winding, to said comparator stage, to the normal load, and to a further standby load, said comparator stage controlling said switch for decoupling the normal load from said first secondary winding as well as for supplying the further standby load.
Claim 10
Dependent Claim
76 words
Circuit according to claim 7, wherein said control circuit includes a pulse width modulator, a control voltage generator, and an overload amplifier, said overload amplifier being driven by said control voltage generator when the normal load is decoupled and said overload amplifier in turn controlling said pulse width modulator for driving said electronic switch for generating a pulse-shaped control signal with a duty cycle of less than 1:10 and a frequency above a given audibility limit.
Claim 11
Dependent Claim
75 words
Circuit according to claim 7, wherein said control circuit includes a pulse width modulator, a control voltage generator, and an overload amplifier, said overload amplifier being driven by said control voltage generator when the normal load is decoupled and said overload amplifier in turn controlling said pulse width modulator for driving said electronic switch for generating a pulse-shaped control signal with a duty cycle for substantially 1:100 and a frequency above a given audibility limit.
Claim 12
Dependent Claim
126 words
Circuit for providing standby operation in a switched power supply with a blocking oscillator, comprising a control circuit, an electronic switch driven by said control circuit, and a transformer having a primary winding connected in series with said electronic switch, a first secondary winding supplying power supply to a normal load of electrical equipment, a second secondary winding driving said control circuit, a further transformer winding strongly coupled to said primary winding and loosely coupled to said first secondary winding for generating a control signal for a standby load supply and a switch connected to said first secondary winding, to said normal load, and to a further standby load and controlled by said further transformer winding for changing the normal load to a larger standby load.
Claim 13
Dependent Claim
126 words
Circuit for providing standby operation in a switched power supply with a blocking oscillator, comprising a control circuit, an electronic switch driven by said control circuit, and a transformer having a primary winding connected in series with said electronic switch, a first secondary winding supplying power supply to a normal load of electrical equipment, a second secondary winding driving said control circuit, a further transformer winding strongly coupled to said primary winding and loosely coupled to said first secondary winding for generating a control signal for a standby load supply and a switch connected to said first secondary winding, to said normal load, and to a further standby load and controlled by said further transformer winding for changing the normal load to a larger standby load.
Claim 14
Dependent Claim
41 words
Circuit according to claim 10, wherein said switch connected to said first secondary winding, to said normal load and to a further standby load and controlled by said further transformer winding switches said further standby load parallel to the normal load.
Claim 15
Dependent Claim
28 words
Circuit according to claim 10, including a comparator stage coupled to said further transformer winding, to a reference and to the standby load for supplying the standby load.
Claim 16
Dependent Claim
76 words
Circuit according to claim 12, wherein said control circuit includes a pulse width modulator, a control voltage generator, and an overload amplifier, said overload amplifier being driven by said control voltage generator when the normal load is decoupled and said overload amplifier in turn controlling said pulse width modulator for driving said electronic switch for generating a pulse-shaped control signal with a duty cycle of less than 1:10 and a frequency above a given audibility limit.
Claim 17
Dependent Claim
75 words
Circuit according to claim 12, wherein said control circuit includes a pulse width modulator, a control voltage generator, and an overload amplifier, said overload amplifier being driven by said control voltage generator when the normal load is decoupled and said overload amplifier in turn controlling said pulse width modulator for driving said electronic switch for generating a pulse-shaped control signal with a duty cycle of substantially 1:100 and a frequency above a given audibility limit.
References Cited (Backward Citations)
US4228493A
Cited
US4486822A
Cited
US4631654A
Cited
DE3312209A1
Cited
US4593347A
Cited
US4597036A
Cited
US4564820A
Cited
US4595977A
Cited
US4631652A
Cited
US4692852A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-26 | 1991-10-26 | 1992-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-26 | 1995-10-26 | 1996-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-26 | 1999-10-26 | 2000-04-26 | $7700.00 | Window Closed / Lapsed |