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公开(公告)号：ZA747386B
公开(公告)日：1975-11-26
申请号：ZA747386
申请日：1974-11-19
Applicant: RCA CORP
Inventor： HAFERL P
Abstract: First and second amplifiers which consume varying currents are combined in such a manner as to require a common substantially constant power supply current. An energy storage device coupled to both amplifiers stores energy during periods of low current consumption by the first of the amplifiers. This stored energy is then provided for the second amplifier during periods of high current consumption by the first. A control circuit is provided which allows the first amplifier priority in fulfilling its current requirements.
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公开(公告)号：BR7303511D0
公开(公告)日：1974-07-11
申请号：BR351173
申请日：1973-05-14
Applicant: RCA CORP
Inventor： HAFERL P
Abstract: A raster centering circuit derives it power from a deflection amplifier and has reduced power consumption through the use of energy storage capacitance. In one embodiment a first capacitor coupled to the deflection winding is charged by deflection current through a first diode during a first portion of the trace interval and discharges through a centering control during a second portion of the trace interval, providing a centering current of one polarlity through the deflection winding. A second capacitor coupled to the deflection circuit charges through a second diode during the retrace interval and discharges through the centering control during the trace interval for producing a centering current of the opposite polarlity through the deflection winding. Adjustment of the centering control determines the net flow of centering current through the deflection winding. In another embodiment the junction of the deflection winding and the deflection winding coupling capacitor is coupled through the centering control and through two parallel oppositely poled diodes to ground such that adjustment of the centering control provides a greater deflection current flow through one of the diodes for producing a negative or positive voltage at the capacitor and winding junction for causing the desired polarity centering current flow through the deflection winding.
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公开(公告)号：BR7508267A
公开(公告)日：1976-08-24
申请号：BR7508267
申请日：1975-12-15
Applicant: RCA CORP
Inventor： HAFERL P
Abstract: A deflection circuit wherein coupling capacitors are placed in series with the transformed yoke impedance to reduce capacitance values and voltage ratings of these capacitors. One of the coupling capacitors also serves to integrate a centering current developed by a centering circuit, thereby providing for a relatively uniform direct current component through the yoke windings throughout each horizontal line of scan.
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Patent Agency Ranking
公开(公告)号：SE372157B
公开(公告)日：1974-12-09
申请号：SE596272
申请日：1972-05-05
Applicant: RCA CORP
Inventor： HAFERL P
Abstract: Burst components of PAL-type encoded signal are retained with modulated subcarrier components as they are processed in 1H delay line assembly and delivered to respective demodulators. Reference oscillation phase to which R-Y demodulator responds is effectively reversed every other line, in response to PAL switch apparatus, in order to provide desired R-Y output in successive lines. Reference oscillation phase to which B-Y demodulator responds is alternated by quadrature switch apparatus between B-Y phase (applied throughout each line interval) and R-Y phase (applied during each inter-line blanking interval). A first gating circuit, coupled to the output of the B-Y demodulator, selects that portion of the B-Y demodulator output developed during the burst interval for passage to integrating and amplifying means in order to develop an AFPC voltage for phase control of the local reference oscillator. A second gating circuit, coupled to the output of the R-Y demodulator, selects that portion of the R-Y demodulator output developed during the burst interval for passage to ACC and color killer circuitry. During color operation (enabled state of bandpass chrominance amplifier) the ACC circuiry develops a control current from the second gating circuit output that adjusts the chrominance amplifier gain in a direction appropriate to maintaining burst amplitude substantially constant at a level set by a manual chroma control. The color killer enables the chrominance amplifier for color operation only when the gated R-Y output indicates by its amplitude the presence of a burst in the received signal and by its polarity the correct switching mode for the PAL switch. Unless such circumstances are present, the color killer disables the chrominance amplifier during each line interval; the killer is keyed, however, to enable the chrominance amplifier during each burst interval so that recovery from the disable state may be effected when appropriate. The color killer circuitry also passes a reset pulse to the PAL switch in the absence of a correct mode indication in the gated R-Y output. The color killer circuitry further serves to control the effectiveness of a subcarrier trap for the receiver's luminance channel, removing the trap during line intervals of monochrome operation.
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公开(公告)号：BR7400779D0
公开(公告)日：1974-09-10
申请号：BR77974
申请日：1974-02-04
Applicant: RCA CORP
Inventor： HAFERL P
Abstract: An amplifier derives a substantially constant current from a direct current voltage source. A first output transistor is coupled in an emitter follower configuration and is biased to provide the desired constant current consumption of the amplifier at zero input signal voltage. The load circuit is alternating current coupled to its emitter. The collector of a second output transistor is also coupled to the emitter of the first output transistor. The emitter of the second output transistor is coupled to the remaining terminal of the load. This junction is coupled through a monitor resistor to a point of reference potential. The monitor resistor monitors the current consumed by the amplifier and the voltage across it controls a third current regulator transistor which is coupled to the base of the second output transistor and controls its conductivity.
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公开(公告)号：SE369571B
公开(公告)日：1974-09-02
申请号：SE306671
申请日：1971-03-10
Applicant: RCA CORP
Inventor： HAFERL P
Abstract: 1334534 Cathode-ray tube circuits RCA CORPORATION 19 April 1971 [11 March 1970] 11688/70 Heading H4T In a (television) cathode-ray tube display circuit arrangement for producing top and bottom pincushion distortion correction, the correction waveform, comprising parabolic shaped line frequency pulses amplitude and polarity modulated by the vertical deflection sawtooth (waveform D) is supplied from a low impedance output Z of the vertical deflection output amplifier 100 to the vertical scanning yoke 126, 126 and because of the high impedance of the yoke to the line frequency correction components the latter are introduced into the yoke by means of an "impedance matching" transformer the secondary 145 of which is connected in series with the yoke windings and the primary 142 of which together with a capacitor 146 resonates at line frequency and therefore presents a high impedance at the vertical deflection frequency across the yoke. Waveform E shows the actual yoke current during the upper and lower halves of the vertical scan, periods T1 and T2 respectively and to maintain the parabolic shape of the line frequency components a sample of the latter, developed across resistor 134, together with a sample of the vertical deflection current, developed across resistor 132 is employed in a negative feed-back path via resistor 129. A waveshaping network 155 supplies an S-shaping signal at terminal B to the B input of the vertical deflection generator 50 and centring is effected by means of adjustable resistor 136. For the production of the parabolic line frequency components the vertical sawtooth from terminal A of the vertical deflection generator 50 is supplied to the collector of transistor 62 and "chopped" into line frequency pulses by means of horizontal fly-back pulses supplied to the base electrode from the horizontal deflection generator 40. The "chopped" waveform is then amplified by transistor 64 and the parabolic shape is produced by a negative feed-back path which includes a first differentiating circuit comprising capacitor 75 and resistor 76, transistor 66 and a second differentiating circuit comprising capacitor 77 and a resistive portion formed by the input impedance of the base circuit of transistor 64. The phase of the correction is adjusted by resistor 73. Parameter values are given.
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公开(公告)号：BR7308817D0
公开(公告)日：1974-08-29
申请号：BR881773
申请日：1973-11-09
Applicant: RCA CORP
Inventor： HAFERL P
IPC: H03F3/21 , H03F1/30 , H03F3/20 , H03F3/30 , H03F3/42 , H04N3/18 , H04N5/60 , H04N5/63 , H04N3/16
Abstract: 1460569 Transistor amplifiers RCA CORPORATION 12 Nov 1973 [13 Nov 1972] 52362/72 Heading H3T An amplifier circuit having constant current consumption comprises first and second transistors 101, 105 series connected between supply terminals, utilization means 104 coupled in parallel across the first transistor 101 and a D.C. impedance 102 monitoring the current through the first transistor and controlling via a third transistor 106 and a resistor 108 the bias to the second transistor 105 so as to provide constant current flow I 0 therethrough. As shown the D.C. power supply for an audio pre-amplifier 80 and output amplifier 100 is obtained by rectification of horizontal deflection flyback pulses from a T.V. receiver and the arrangement maintains the current drawn therefrom constant. Thermal stability of I 0 is achieved by the diodes 109 and 110. The audio amplifier is protected against a short circuit across the speaker 104 since the maximum current can only reach the value I 0 .
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公开(公告)号：CA934880A
公开(公告)日：1973-10-02
申请号：CA106564
申请日：1971-03-01
Applicant: RCA CORP
Inventor： HAFERL P
Abstract: 1334534 Cathode-ray tube circuits RCA CORPORATION 19 April 1971 [11 March 1970] 11688/70 Heading H4T In a (television) cathode-ray tube display circuit arrangement for producing top and bottom pincushion distortion correction, the correction waveform, comprising parabolic shaped line frequency pulses amplitude and polarity modulated by the vertical deflection sawtooth (waveform D) is supplied from a low impedance output Z of the vertical deflection output amplifier 100 to the vertical scanning yoke 126, 126 and because of the high impedance of the yoke to the line frequency correction components the latter are introduced into the yoke by means of an "impedance matching" transformer the secondary 145 of which is connected in series with the yoke windings and the primary 142 of which together with a capacitor 146 resonates at line frequency and therefore presents a high impedance at the vertical deflection frequency across the yoke. Waveform E shows the actual yoke current during the upper and lower halves of the vertical scan, periods T1 and T2 respectively and to maintain the parabolic shape of the line frequency components a sample of the latter, developed across resistor 134, together with a sample of the vertical deflection current, developed across resistor 132 is employed in a negative feed-back path via resistor 129. A waveshaping network 155 supplies an S-shaping signal at terminal B to the B input of the vertical deflection generator 50 and centring is effected by means of adjustable resistor 136. For the production of the parabolic line frequency components the vertical sawtooth from terminal A of the vertical deflection generator 50 is supplied to the collector of transistor 62 and "chopped" into line frequency pulses by means of horizontal fly-back pulses supplied to the base electrode from the horizontal deflection generator 40. The "chopped" waveform is then amplified by transistor 64 and the parabolic shape is produced by a negative feed-back path which includes a first differentiating circuit comprising capacitor 75 and resistor 76, transistor 66 and a second differentiating circuit comprising capacitor 77 and a resistive portion formed by the input impedance of the base circuit of transistor 64. The phase of the correction is adjusted by resistor 73. Parameter values are given.
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