US3909701A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Linear energy conservative current source
Assignee: RTX Corp
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Filing: 1974-10-03
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Granted: 1975-09-30
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Expires: 1994-10-03
Abstract
Abstract A regulated energy-conservative current source including a large inductance provides substantially all of the desired current to a deflection yoke or other load by modulation of an electronic switch which is turned on in response to the current drawn by an amplifier being above an upper threshold and is turned off in response to the amplifier current being below a lower threshold. Feedback of the load current controls the amplifier to make up the difference between the desired current and that supplied by the large inductance. Embodiments include a trigger, a differential amplifier with positive feedback, and windings coupled to the large inductance. As an energy saving adjunct in a magnetic deflection system for a CRT, bipolar embodiments, employing a single large inductance with duplicate other apparatus, provide regulated current of either polarity or zero magnitude. External feedback and local feedback embodiments are disclosed.
Inventors
- 👤 Glenn C Waehner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:15
CPC Classifications
G; G09; G09G; G09G1/00; G09G1/04; H; H03; H03K; H03K4/00; H03K4/06; H03K4/08; H03K4/48; H03K4/60; H03K4/69; H03K4/696; H03K6/00; H03K6/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
166 words
An energy conservative current source comprising: a current load; an amplifier stage connected to said current load at a node and having feedback indicative of current supplied to said node and responsive to an input signal and said feedback to provide current to said load commensurate with said input signal; a DC power supply and a current sensor connecting said DC power supply to said amplifier stage; an inductance having one end connected to said current load at said node; an electronic switch connected between said power supply and the other end of said inductance; switch control means responsive to current flow between said power supply and said amplifier in excess of a given magnitude for turning on said electronic switch and responsive to current flow between said power supply and said amplifier of a magnitude less than said given magnitude for turning off said electronic switch; and means to provide a path for current flow through said inductance when said electronic switch is turned off.
Claim 2
Dependent Claim
166 words
An energy conservative current source comprising: a current load; an amplifier stage connected to said current load at a node and having feedback indicative of current supplied to said node and responsive to an input signal and said feedback to provide current to said load commensurate with said input signal; a DC power supply and a current sensor connecting said DC power supply to said amplifier stage; an inductance having one end connected to said current load at said node; an electronic switch connected between said power supply and the other end of said inductance; switch control means responsive to current flow between said power supply and said amplifier in excess of a given magnitude for turning on said electronic switch and responsive to current flow between said power supply and said amplifier of a magnitude less than said given magnitude for turning off said electronic switch; and means to provide a path for current flow through said inductance when said electronic switch is turned off.
Claim 3
Dependent Claim
56 words
A current source according to claim 1 wherein said last named means comprises a unilateral conducting path connected from the return side of said power supply to the other end of said inductance and poled to conduct current to said inductance in the same polarity as current conducted through said electronic switch from said power supply.
Claim 4
Dependent Claim
16 words
A current source according to claim 1 wherein said switch control means comprises a Schmidt trigger.
Claim 5
Dependent Claim
81 words
A current source according to claim 1 wherein said switch control means comprises a differential current amplifier, responsive to said current seNsor and to a voltage divider connected to said power supply, and a transistor switch responsive to said amplifier, the output of said transistor switch providing a turn-on signal for said electronic switch and providing feedback to said current amplifier to cause it to turn full on or full off in response to variations in current in said current sensor.
Claim 6
Dependent Claim
66 words
A current source according to claim 1 wherein said switch control means comprises a winding magnetically coupled to said inductance and poled with respect to said inductance in such a fashion that an increase in current in said inductance induces a voltage in said winding of a polarity to turn said electronic switch full on, said winding connected between said current sensor and said electronic switch.
Claim 7
Dependent Claim
188 words
An energy conservative bipolar current source comprising: a current load; a bipolar amplifier operable with respect to bipolar working voltages applied to inputs thereto and responsive to a feedback signal from said current load and to an input signal to provide current to said load commensurate with said input signal: a pair of current sensors; a positive DC power supply and a negative DC power supply connected through respective ones of said current sensors to corresponding voltage inputs of said amplifier; an inductance having one end connected to said current load and the other end connected through respective electronic switches to each of said two power supplies; a pair of switch control means, each responsive to current of a given magnitude in one of said current sensors to turn on the related one of said electronic switches and responsive to current of a magnitude less than said given magnitude in the related one of said current sensors for turning off the corresponding one of said electronic switches; and means providing paths for current to flow in either direction through said inductance when said electronic switches are turned off.
Claim 8
Dependent Claim
188 words
An energy conservative bipolar current source comprising: a current load; a bipolar amplifier operable with respect to bipolar working voltages applied to inputs thereto and responsive to a feedback signal from said current load and to an input signal to provide current to said load commensurate with said input signal: a pair of current sensors; a positive DC power supply and a negative DC power supply connected through respective ones of said current sensors to corresponding voltage inputs of said amplifier; an inductance having one end connected to said current load and the other end connected through respective electronic switches to each of said two power supplies; a pair of switch control means, each responsive to current of a given magnitude in one of said current sensors to turn on the related one of said electronic switches and responsive to current of a magnitude less than said given magnitude in the related one of said current sensors for turning off the corresponding one of said electronic switches; and means providing paths for current to flow in either direction through said inductance when said electronic switches are turned off.
Claim 9
Dependent Claim
49 words
A current source according to claim 6 wherein said last named means comprises: a unilaterally conductive path shunting each of said electronic switches and poled to conduct current in the direction opposite to the conduction of current to said inductance through the one of said electronic switches shunted thereby.
Claim 10
Dependent Claim
87 words
A current source according to claim 6 wherein each of said switch control means comprises a differential current amplifier, responsive to the related current sensor and to a voltage divider connected to said power supply, and a transistor switch responsive to said amplifier, the output of said transistor switch providing a turn-on signal for the related electronic switch and providing feedback to the related current amplifier to cause it to turn full on or full off in response to variations in current in the related current sensor.
Claim 11
Dependent Claim
68 words
A current source according to claim 6 wherein each of said control means comprises a winding magnetically coupled to said inductance and poled with respect to said inductance in such a fashion that an increase in current in said inductance induces a voltage in said winding of a polarity to turn the related electronic switch full on, each winding connected between the related current sensor and electronic switch.
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) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |