Patent US3659141A successfully refreshed from Google Patents.
US3659141A
Expired / Lapsed
US
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Current control circuit for operating a deflection yoke
Assignee: Motorola Solutions Inc
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Filing: 1970-05-20
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Granted: 1972-04-25
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Expires: 1990-05-20
Abstract
Abstract A current control circuit having a pair of current generators connected in circuit with one another at a common circuit point for controlling a direct current voltage source in such a manner as to produce an alternating current through current utilization means coupled to the common circuit point. Where a substantially linear increasing sawtooth-shaped control signal is applied to the current generators, the current output at the common circuit point is also a linear increasing sawtooth, initially of one polarity, passing through zero and then of another polarity to produce a current sweep signal suitable for use with a printed circuit deflection yoke where such is used as the current utilization means.
Inventors
- 👤 Robert Kubala
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:55
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/06; H03K4/08; H03K4/48; H03K4/60; H03K4/69; H03K4/72; H03K4/725
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
260 words
A current control circuit for operation from a direct current voltage source to provide current of both polarities in a given branch of said circuit, comprising: first and second current generating means connected in circuit, one with the other, at a common circuit point, said first current generating means delivering current to said common circuit point and said second current generating means receiving current from said common circuit point; current utilization means having one end thereof coupled to said common circuit point for receiving current therefrom first of one polarity and then of another polarity; and control means coupled to said first and second current generating means for causing each of said current generating means initially to conduct current of different relative values such that at the outset of their conduction, during a given current generating cycle, the current through said first current generating means is maximum and the current through said second generating means is minimum to cause current of one polarity to flow into said current utilization means from said common circuit point at a maximum current value, said control means causing diminishing of current through said first current generating means while simultaneously causing increasing of current through said second current generating means ultimately to provide a zero current flow through said current utilization means, and said control means further simultaneously diminishing the current through said first current generating means and increasing the current in said second current generating means to cause a reversal of current in said current utilization means to a maximum value of opposite polarity.
Claim 2
Dependent Claim
260 words
A current control circuit for operation from a direct current voltage source to provide current of both polarities in a given branch of said circuit, comprising: first and second current generating means connected in circuit, one with the other, at a common circuit point, said first current generating means delivering current to said common circuit point and said second current generating means receiving current from said common circuit point; current utilization means having one end thereof coupled to said common circuit point for receiving current therefrom first of one polarity and then of another polarity; and control means coupled to said first and second current generating means for causing each of said current generating means initially to conduct current of different relative values such that at the outset of their conduction, during a given current generating cycle, the current through said first current generating means is maximum and the current through said second generating means is minimum to cause current of one polarity to flow into said current utilization means from said common circuit point at a maximum current value, said control means causing diminishing of current through said first current generating means while simultaneously causing increasing of current through said second current generating means ultimately to provide a zero current flow through said current utilization means, and said control means further simultaneously diminishing the current through said first current generating means and increasing the current in said second current generating means to cause a reversal of current in said current utilization means to a maximum value of opposite polarity.
Claim 3
Dependent Claim
54 words
The current control circuit of claim 1 wherein said control means includes waveform generating means to produce a substantially linearly increasing sawtooth waveform to control current through said first and second current generating means in a substantially linearly increasing and decreasing manner, respectively, to provide a substantially linearly increasing current through said utilization means.
Claim 4
Dependent Claim
20 words
The current contRol circuit of claim 1 wherein said utilization means is a deflection yoke for an electron beam device.
Claim 5
Dependent Claim
17 words
The current control circuit of claim 3 wherein said deflection yoke is a printed circuit deflection yoke.
Claim 6
Dependent Claim
54 words
The current control circuit of claim 1 wherein said first and second current generating means each include at least one current control device having a load electrode and a control electrode, said current control devices being connected in series with one another and having said common circuit point formed between their respective load electrodes.
Claim 7
Dependent Claim
130 words
The current control circuit of claim 5 wherein said control means provide a control signal to the control electrode of the current control device of said first current generating means through a coupling capacitor during which time the charge on said coupling capacitor changes from a desired initial charged condition, and further including a clamping feedback circuit having threshold voltage means connected between the other end of said utilization means and said coupling capacitor such that at the end of a given cycle of operation of the current control circuit, a difference of potential will appear across said threshold voltage means sufficient to render it highly conductive thereby restoring the charge on said coupling capacitor to the initial desired charge condition for the beginning of the next cycle of operation.
Claim 8
Dependent Claim
17 words
The current control circuit of claim 6 wherein a said threshold voltage means includes a zener diode.
Claim 9
Dependent Claim
47 words
The current control circuit of claim 7 further including an energy storage capacitor connected to the other end of said utilization means for receiving charge thereon in response to the conduction of said threshold voltage means when restoring said coupling capacitor to its initial desired charged condition.
Claim 10
Dependent Claim
23 words
The current control circuit of claim 8 wherein said coupling capacitor and said energy storage capacitor are substantially of the same capacitance value.
Claim 11
Dependent Claim
79 words
The current control circuit of claim 5 wherein said utilization means is a deflection yoke through which a sweep current passes during a major portion of the sweep cycle and a retrace current passes during a minor portion of the sweep cycle, and further including a diode connecting between the current control device of said first current generator and said circuit point to prevent said current control device from being forward biased during the retrace portion of the cycle.
Claim 12
Dependent Claim
84 words
The current control circuit of claim 5 wherein said utilization means is a yoke through which a sweep current passes during a major portion of the sweep cycle and a retrace current passes during a minor portion of the sweep cycle, and further including a capacitor connected between said common circuit point and ground potential to increase the rate of the retrace portion of the sweep cycle and to prevent voltage breakdown of said second current control device in said second current generating means.
Claim 13
Dependent Claim
68 words
The current control circuit of claim 1 wherein said first and second current generating means each include at least one transistor, the transistors being connected in series with one another, and said common circuit point being formed between said transistors, the transistor of said first current generating means being of one conductivity type and the transistor of said second current generating means being of the opposite conductivity type.
Claim 14
Dependent Claim
19 words
The current control circuit of claim 12 wherein said transistors have their collectors connected at said common circuit point.
Claim 15
Dependent Claim
155 words
The current control circuit of claim 1 wherein said current control means include waveform generating means to produce a substantially linearly increasing sawtooth waveform to control the current through said first and second current generating means in a substantially linearly increasing and decreasing manner, respectively, to provide a substantially linearly increasing current through said utilization means, said waveform generating means including waveform size adjusting means for adjustably selecting the size of said sawtooth waveform, buffer means coupled between said waveform generating means and said first and second current generating means for receiving said sawtooth waveform and delivering it simultaneously to said first and second current generators, and centering adjustment variable resistance means connected to the other end of said current utilization means for selectively adjusting the average DC current value through said current utilization means independent of and with no affect on the size of the sawtooth waveform as determined by said size adjusting means.
References Cited (Backward Citations)
US3483425A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |