Patent US4825851A successfully refreshed from Google Patents.
US3594499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage-stepdown circuit arrangement for television power supply
Assignee: STMicroelectronics SRL
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Filing: 1969-02-27
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Granted: 1971-07-20
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Expires: 1989-02-27
Abstract
Abstract In order to provide a reduced output voltage for feeding a transistorized load, a rectified supply voltage from an AC utility outlet is chopped under the control of a recurrent pulse in the load circuit, specifically the flyback pulse of the horizontal sweep circuit of a television receiver, with the aid of a normally blocked transistor connected to be unblocked by an intermittent biasing current from a secondary winding of a transformer whose primary winding acts as an inductance of a smoothing network for the chopped supply voltage.
Inventors
- 👤 Vincenzo Sansone
- 👤 Franco Gatti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:47
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/06; H03K4/08; H03K4/48; H03K4/60; H03K4/62; H02; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/10; H02M3/145; H02M3/155; H02M3/156; H02M3/158; H04; H04N; H04N3/00; H04N3/10; H04N3/16; H04N3/18; H04N5/00; H04N5/63
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
101 words
A power supply network for converting a continuous supply voltage into a reduced continuous output voltage, comprising an input circuit connected to receive said supply voltage, a load circuit, circuit means including normally blocked transistor means connecting said input circuit across said load circuit, and control means for periodically unblocking said transistor means to generate a pulse train in the output thereof, said circuit means further including impedance means in cascade with said transistor means for integrating said pulse train, said impedance means comprising a primary winding and said control means comprising a secondary winding inductively coupled to said primary winding.
Claim 2
Dependent Claim
101 words
A power supply network for converting a continuous supply voltage into a reduced continuous output voltage, comprising an input circuit connected to receive said supply voltage, a load circuit, circuit means including normally blocked transistor means connecting said input circuit across said load circuit, and control means for periodically unblocking said transistor means to generate a pulse train in the output thereof, said circuit means further including impedance means in cascade with said transistor means for integrating said pulse train, said impedance means comprising a primary winding and said control means comprising a secondary winding inductively coupled to said primary winding.
Claim 3
Dependent Claim
36 words
A network as defined in claim 1 wherein said windings are part of a transformer also having a voltage-stepup load winding, said load circuit including a high-voltage electrode connected to be energized from said load winding.
Claim 4
Dependent Claim
26 words
A network as defined in claim 2 wherein said load circuit comprises a part of a television receiver with a cathode-ray tube provided with said electrode.
Claim 5
Dependent Claim
46 words
A network as defined in claim 1 wherein said load circuit comprises part of a television receiver provided with a sweep circuit including a source of synchronizing pulses, said primary winding being coupled to said sweep circuit for energization in the rhythm of said synchronizing pulses.
Claim 6
Dependent Claim
146 words
A network as defined in claim 4 wherein said sweep circuit comprises coil means, a storage condenser in series with said coil means, a flyback condenser of lower capacitance than said storage condenser shunting the series combination of said storage condenser and said coil means, unidirectionally conductive electronic switch means bridged across said flyback condenser and connected to said source for periodically establishing a discharge path for said storage condenser by way of said coil means, and diode means connected in parallel with said switch means but with opposite polarity to give passage to a return flow recharging said storage condenser at a rate determined by the inductance of said coil means, said sweep circuit being connected across the output of said transistor means in parallel with said impedance means for energizing said primary winding in response to a voltage pulse developed across said flyback condenser.
Claim 7
Dependent Claim
30 words
A network as defined in claim 5, further comprising a resistor in the output of said transistor means connected in series with both said impedance means and said sweep circuit.
Claim 8
Dependent Claim
37 words
A network as defined in claim 5, further comprising a reactive staRting circuit bypassing said transistor means and extending from said input circuit to said condensers for initially charging same upon application of said supply voltage thereto.
Claim 9
Dependent Claim
40 words
A network as defined in claim 5 wherein said control means further comprises a differentiation circuit inserted between said secondary winding and said transistor means for biasing the latter into conductivity during only an initial part of said voltage pulse.
Claim 10
Dependent Claim
21 words
A network as defined in claim 1 wherein said transistor means comprises a pair of substantially identical transistors connected in cascade.
References Cited (Backward Citations)
US3510578A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |