US3297880A - Electric circuits for supplying a substantially constant current to a load - Google Patents

Electric circuits for supplying a substantially constant current to a load Download PDF

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US3297880A
US3297880A US279142A US27914263A US3297880A US 3297880 A US3297880 A US 3297880A US 279142 A US279142 A US 279142A US 27914263 A US27914263 A US 27914263A US 3297880 A US3297880 A US 3297880A
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load
frequency
amplifier
current
substantially constant
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US279142A
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Clarke John Philip
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General Electric Co PLC
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General Electric Co PLC
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/337—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in push-pull configuration
    • H02M3/3376—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in push-pull configuration with automatic control of output voltage or current
    • H02M3/3378—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in push-pull configuration with automatic control of output voltage or current in a push-pull configuration of the parallel type
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/12—Regulating voltage or current wherein the variable actually regulated by the final control device is ac
    • G05F1/40—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using discharge tubes or semiconductor devices as final control devices
    • G05F1/44—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using discharge tubes or semiconductor devices as final control devices semiconductor devices only

Definitions

  • an electric circuit for supplying a substantially constant current to a load comprises means arranged to supply a control signal the value of which depends upon the value of the current supplied to the load, an oscillator to which the control signal is supplied, the oscillator being arranged to supply an oscillatory signal the frequency of which varies with variations in the control signal, a network to which the oscillatory signal is supplied, the network being such that the value of the current passed by the network varies with variations in the frequency of the oscillatory signal, and a rectifier arrangement which is arranged to rectify the signal supplied by said network, the current passed by the rectifier arrangement providing the required current which is supplied to the load, the arrangement being such that a change in the value of the current supplied to the load results in a change in the frequency of the oscillatory signal such that the value of the current passed by said network changes in such a sense as to tend to restore the current supplied to the load to the required value.
  • the control signal may be derived from across a resistor which is arranged to be connected in series with the load.
  • FIGURE 1 shows a block schematic representation of the system
  • FIGURES 2 and 3 together show diagrammatically a part of the system of FIGURE 1 when the two figures are placed side-by-side with FIGURE 2 to the left of FIG- URE 3.
  • the system comprises two parts 1 and 2, each of which acts as a source of substantially constant current. Since the parts 1 and 2 are substantially similar only the part 1 will be described in detail.
  • the part 1 includes a multivibrator 3 which supplies an oscillatory signal by way of a low pass filter 4 to a power amplifier 5, the output signal of which passes to a rectifying and smoothing network 6.
  • the positive output lead 7 of the network 6 is connected to the negative lead 8 of the part 2 and is also connected by way of a resistor 9 to earth, and the negative output lead 10 of the network 6 is connected to a terminal 11.
  • a control signal that is dependent upon the value of the current carried by the lead 7 is passed to a control amplifier 12 the output of which is utilised to control the frequency of oscillation of the multivibrator 3.
  • the multivibrator 3 supplies an oscillatory signal which normally has a frequency of about five kilo'cycles per second, but which may be varied over a range of a hundred cycles per second on either side of that frequency in dependence upon the signal supplied by the control amplifier 12.
  • the characteristic of the filter 4 is such that the amplitude of the oscillatory signal passed to the power amplifier 5 depends upon the frequency of the oscillatory signal.
  • the amplitude of the output signal from the amplifier 5, and hence the value of the current passing through the leads 7 and 10 depends upon the frequency of the oscillatory signal supplied by the multivibrator 3.
  • the signal passed to the control amplifier 12 varies from its normal value, and the consequent variation in the output signal of the control amplifier 12 causes the frequency of oscillation of the multivibrator 3 to vary in such a sense as to tend to restore the current flowing in the lead 7 to the required value.
  • the characteristic of the filter 4 is such that the normal frequency of oscillation of the multivibrator 3 falls at the mid-point of its transistion range, and such that over a range of frequencies from a hundred cycles per second below the normal frequency to a hundred cycles per second above the normal frequency the attenuation produced by the filter 4 increases linearly with frequency.
  • the multivibrator 3 comprises a pair of junction transistors 13 and 14 which have their collector and base electrodes cross-coupled in conventional manner by way of capacitors 15 and 16.
  • the base electrodes of the transistors 13 and 14 are further connected by way of resistors 17 and 18 respectively to a point 19 the potential of which is determined in a manner to be described hereinafter.
  • a resistor 20 which forms part of the load impedance of the transistor 14 is connected by way of leads 21 and 22 between the input terminals 23 and 24 of a low pass filter 4.
  • the output terminals 25 and 26 of the filter 4 are connected to the primary winding 27 of a transformer 28, the secondary winding 29 of which is connected in the input circuit of the power amplifier 5.
  • the power amplifier 5 comprises a transistor amplifier stage 30 which acts as a driver amplifier and phase-splitter for a pushpull amplifier stage 31.
  • the secondary winding 32 of the output transformer 33 of the amplifier stage 31 is connected across one diagonal of a bridge rectifier 34, the other diagonal of which is connected to the load circuit by way of the leads 7 and 10.
  • Capacitors 35 and 36 connected between the leads 7 and 10 and resistors 37, 38 and 39 in series with the lead 7 form a smoothing network for the output of the bridge rectifier 34.
  • the terminals of the resistor 38 are connected, by way of leads 41) and 41, to the input circuit of the control amplifier 12, and the terminals of the resistor 39 are connected to the input of an alarm circuit 42.
  • the control amplifier 12 comprises a transistor 43, connected in the common emitter configuration, having its collector electrode connected by way of a resistor 44 to the base electrode of a transistor 45 which is connected as an emitter-follower.
  • the emitter electrode of the transistor 45 is connected to the point 19 in the multivibrator 3.
  • the lead 41 is connected to the junction 46 between a resistor 47 and a Zener diode 48 which are connected, in series with a diode 49, between the terminals of a further Zener diode 5h.
  • the junction 46 is thus maintained at a substantially constant negative potential with respect to the positive supply line 51.
  • the lead 40 is connected to the base electrode of the transistor 43.
  • the positive and negative supply lines 51 and 52 from the power supply 53 are isolated from earth potential, so that the control amplifier 12, the multivibrator 3 and the filter 4 have a potential with respect to earth which is determined by the potential on the lead 41.
  • the voltage applied between the base electrode of the transistor 43 and the supply line 51 in the control amplifier 12 is equal to the sum of the voltages developed across the Zener diode 1$, the diode 49 and the resistor 38 which is in series with the output lead 7.
  • a negative bias with respect to the supply line 51 is thus applied to the base electrode of the transistor 43, the magnitude of this bias increasing when the voltage across the resistor 38 de- CIGESCS.
  • the negative bias on the base of transistor 43 determines the bias applied to the base electrode of the transistor 45 and hence determines the potential at the point 19.
  • the potential at the point 19 determines the rate of discharge of the capacitors 15 and 16 in the multivibrator 3 and hence the frequency of oscillation of the multivibrator 3.
  • the voltage developed across the resistor 38 decreases in magnitude so that the bias on the base electrode of transistor 43 becomes more negative.
  • the potential at the point 19 becomes less negative with respect to the supply line 51, the capacitors 15 and 16 in the multivibrator 3 discharge more slowly, and the frequency of oscillation is lowered. Due to the characteristic of the low-pass filter 4 the amplitude of the signal passed to the power amplifier 5 is greater at the lower frequency, so that the output of the amplifier 5 is increased, this increase tending to restore the current in the load circuit to the required value.
  • the part 2 shown schematically in FIGURE 1 differs from the part 1 described above only in the respect that the normal frequency of oscillation employed in the part 2 is about five and a half kilocycles per second, the filter 54 in the part 2 having a characteristic suitable for operation, in the manner described above, at this frequency.
  • the different operating frequencies are employed in order to avoid the possibility of any coupling between the two parts 1 and 2 resulting in low frequency beats which would be diflicult to filter out of the rectified output of the circuit.
  • the output paths of the parts 1 and 2 are connected in series to provide supplies at terminals 11 and 55 respectively negative and positive with respect to earth potential.
  • the performance of the part 2 is deliberately degraded by the addition of a shunt resistor 56 connected between the terminal and the lead 8
  • a shunt resistor 56 connected between the terminal and the lead 8
  • An electric circuit for supplying a substantially constant unidirectional current to a load comprising- (I) an alternating current generator, the frequency of which is variable over a predetermined range,
  • (V) rectifier means to derive from the output signal of the amplifier, the unidirectional current which is to be passed to the load
  • (VI) means to derive a unidirectional control voltage from said unidirectional current
  • VI means to supply the control voltage to said generator to control the frequency thereof.
  • An electric supply system for supplying direct current to a balanced load comprising two electric circuits, each of which is in accordance with claim 1, and means connecting the output paths of said two circuits in series across the balanced load.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Amplifiers (AREA)
  • Ac-Ac Conversion (AREA)

Description

' ELECTRIC CIRCUITS FOR SUPPLYING A SUBSTANTIALLY CONSTANT CURRENT TO A LOAD Filed May 9, 1963 3 Sheets-Sheet 1 I i i Coniroi A? Amplifier 4O\ H ll 5 i i p i a f Muliiower \libraior mm Amplifier Reamer i F P t n Q p 'i Filier power Rectifier %56:
54 i i I Coniroi Amplifier I55 Y J Fig.1
inl'vsniroil J. P. CLARKE 3,297,880 ELECTRIC CIRCUITS FOR SUPPLYING A SUBSTANTIALLY Jan. 10, 1967 CONSTANT CURRENT TO A LOAD Filed May 9, 1963 3 Sheets-Sheet 2 mveu'ro (/Omv Z/LIP (ZFWKF Fig.2
Jan. 10, 1967 Filed May 9, 1963 J. P. CLARKE ELECTRIC CIRCUITS FOR SUPPLYING A SUBSTANTIALLY CONSTANT CURRENT TO A LOAD 5 Sheets-Sheet 3 Fig.3
Alarm F TTQRNEYS United States Patent Ofifice 3,297,880 Patented Jan. 10, 1967 3,297,880 ELECTRIC cmctn'rs non SUPPLYING A son- STANTIALLY CGNSTANT CURRENT TO A LOAD This invention relates to electric circuits for supplying a substantially constant current to a load.
According to the present invention, an electric circuit for supplying a substantially constant current to a load comprises means arranged to supply a control signal the value of which depends upon the value of the current supplied to the load, an oscillator to which the control signal is supplied, the oscillator being arranged to supply an oscillatory signal the frequency of which varies with variations in the control signal, a network to which the oscillatory signal is supplied, the network being such that the value of the current passed by the network varies with variations in the frequency of the oscillatory signal, and a rectifier arrangement which is arranged to rectify the signal supplied by said network, the current passed by the rectifier arrangement providing the required current which is supplied to the load, the arrangement being such that a change in the value of the current supplied to the load results in a change in the frequency of the oscillatory signal such that the value of the current passed by said network changes in such a sense as to tend to restore the current supplied to the load to the required value.
The control signal may be derived from across a resistor which is arranged to be connected in series with the load.
An electric supply system in accordance with the present invention for supplying direct current of substantially constant value to a balanced load, will now be described by way of example with reference to the accompanying drawings, of which:
FIGURE 1 shows a block schematic representation of the system, and
FIGURES 2 and 3 together show diagrammatically a part of the system of FIGURE 1 when the two figures are placed side-by-side with FIGURE 2 to the left of FIG- URE 3.
Referring first to FIGURE 1, the system comprises two parts 1 and 2, each of which acts as a source of substantially constant current. Since the parts 1 and 2 are substantially similar only the part 1 will be described in detail.
The part 1 includes a multivibrator 3 which supplies an oscillatory signal by way of a low pass filter 4 to a power amplifier 5, the output signal of which passes to a rectifying and smoothing network 6. The positive output lead 7 of the network 6 is connected to the negative lead 8 of the part 2 and is also connected by way of a resistor 9 to earth, and the negative output lead 10 of the network 6 is connected to a terminal 11.
A control signal that is dependent upon the value of the current carried by the lead 7 is passed to a control amplifier 12 the output of which is utilised to control the frequency of oscillation of the multivibrator 3.
During operation the multivibrator 3 supplies an oscillatory signal which normally has a frequency of about five kilo'cycles per second, but which may be varied over a range of a hundred cycles per second on either side of that frequency in dependence upon the signal supplied by the control amplifier 12. The characteristic of the filter 4 is such that the amplitude of the oscillatory signal passed to the power amplifier 5 depends upon the frequency of the oscillatory signal. Thus the amplitude of the output signal from the amplifier 5, and hence the value of the current passing through the leads 7 and 10 depends upon the frequency of the oscillatory signal supplied by the multivibrator 3.
If the current flowing in the lead 7 departs from the required value the signal passed to the control amplifier 12 varies from its normal value, and the consequent variation in the output signal of the control amplifier 12 causes the frequency of oscillation of the multivibrator 3 to vary in such a sense as to tend to restore the current flowing in the lead 7 to the required value.
The characteristic of the filter 4 is such that the normal frequency of oscillation of the multivibrator 3 falls at the mid-point of its transistion range, and such that over a range of frequencies from a hundred cycles per second below the normal frequency to a hundred cycles per second above the normal frequency the attenuation produced by the filter 4 increases linearly with frequency.
Referring now to FIGURES 2 and 3, in which the circuit of the part 1 of FIGURE 1 is shown diagrammatically, the multivibrator 3 comprises a pair of junction transistors 13 and 14 which have their collector and base electrodes cross-coupled in conventional manner by way of capacitors 15 and 16. The base electrodes of the transistors 13 and 14 are further connected by way of resistors 17 and 18 respectively to a point 19 the potential of which is determined in a manner to be described hereinafter.
A resistor 20 which forms part of the load impedance of the transistor 14 is connected by way of leads 21 and 22 between the input terminals 23 and 24 of a low pass filter 4. The output terminals 25 and 26 of the filter 4 are connected to the primary winding 27 of a transformer 28, the secondary winding 29 of which is connected in the input circuit of the power amplifier 5. The power amplifier 5 comprises a transistor amplifier stage 30 which acts as a driver amplifier and phase-splitter for a pushpull amplifier stage 31.
The secondary winding 32 of the output transformer 33 of the amplifier stage 31 is connected across one diagonal of a bridge rectifier 34, the other diagonal of which is connected to the load circuit by way of the leads 7 and 10. Capacitors 35 and 36 connected between the leads 7 and 10 and resistors 37, 38 and 39 in series with the lead 7 form a smoothing network for the output of the bridge rectifier 34.
The terminals of the resistor 38 are connected, by way of leads 41) and 41, to the input circuit of the control amplifier 12, and the terminals of the resistor 39 are connected to the input of an alarm circuit 42.
The control amplifier 12 comprises a transistor 43, connected in the common emitter configuration, having its collector electrode connected by way of a resistor 44 to the base electrode of a transistor 45 which is connected as an emitter-follower. The emitter electrode of the transistor 45 is connected to the point 19 in the multivibrator 3.
The lead 41 is connected to the junction 46 between a resistor 47 and a Zener diode 48 which are connected, in series with a diode 49, between the terminals of a further Zener diode 5h. The junction 46 is thus maintained at a substantially constant negative potential with respect to the positive supply line 51. The lead 40 is connected to the base electrode of the transistor 43. The positive and negative supply lines 51 and 52 from the power supply 53 are isolated from earth potential, so that the control amplifier 12, the multivibrator 3 and the filter 4 have a potential with respect to earth which is determined by the potential on the lead 41.
In operation the voltage applied between the base electrode of the transistor 43 and the supply line 51 in the control amplifier 12 is equal to the sum of the voltages developed across the Zener diode 1$, the diode 49 and the resistor 38 which is in series with the output lead 7. Under normal operating conditions a negative bias with respect to the supply line 51 is thus applied to the base electrode of the transistor 43, the magnitude of this bias increasing when the voltage across the resistor 38 de- CIGESCS.
The negative bias on the base of transistor 43 determines the bias applied to the base electrode of the transistor 45 and hence determines the potential at the point 19. The potential at the point 19 determines the rate of discharge of the capacitors 15 and 16 in the multivibrator 3 and hence the frequency of oscillation of the multivibrator 3.
If the current supplied to the load falls below the required value, the voltage developed across the resistor 38 decreases in magnitude so that the bias on the base electrode of transistor 43 becomes more negative. Hence the potential at the point 19 becomes less negative with respect to the supply line 51, the capacitors 15 and 16 in the multivibrator 3 discharge more slowly, and the frequency of oscillation is lowered. Due to the characteristic of the low-pass filter 4 the amplitude of the signal passed to the power amplifier 5 is greater at the lower frequency, so that the output of the amplifier 5 is increased, this increase tending to restore the current in the load circuit to the required value.
If the current in the load circuit increases the frequency of oscillation of the multivibrator 3 increases, so that the output of the amplifier 5 is reduced. The required stabilisation of the value of the current supplied to the load is therefore achieved.
The part 2 shown schematically in FIGURE 1 differs from the part 1 described above only in the respect that the normal frequency of oscillation employed in the part 2 is about five and a half kilocycles per second, the filter 54 in the part 2 having a characteristic suitable for operation, in the manner described above, at this frequency. The different operating frequencies are employed in order to avoid the possibility of any coupling between the two parts 1 and 2 resulting in low frequency beats which would be diflicult to filter out of the rectified output of the circuit.
It will be noted that the output paths of the parts 1 and 2 are connected in series to provide supplies at terminals 11 and 55 respectively negative and positive with respect to earth potential. In order that the two sources of substantially constant current may be so connected in series the performance of the part 2 is deliberately degraded by the addition of a shunt resistor 56 connected between the terminal and the lead 8 Although the system described above with reference to the accompanying drawings comprises the two substantially similar parts 1 and 2, it will be appreciated that either of these parts, for example the part 1 described with reference to FIGURES 2 and 3, may be used independently as a source of substantially constant current.
I claim:
1. An electric circuit for supplying a substantially constant unidirectional current to a load, said circuit compris- (I) an alternating current generator, the frequency of which is variable over a predetermined range,
(II) a passive network having a frequency response that varies linearly at least over said range of frequencies,
(III) a power amplifier,
(IV) means connecting the output of the generator to the input of said amplifier by way of said network,
(V) rectifier means to derive from the output signal of the amplifier, the unidirectional current which is to be passed to the load,
(VI) means to derive a unidirectional control voltage from said unidirectional current, and
(VII) means to supply the control voltage to said generator to control the frequency thereof.
2. An electric circuit according to claim 1 wherein the means to derive said control voltage includes a resistor connected in series with the load.
3. An electric circuit according to claim 1 wherein the network is a low-pass filter network.
4. An electric circuit according to claim 1 wherein the oscillator is a multivibrator.
5. An electric supply system for supplying direct current to a balanced load comprising two electric circuits, each of which is in accordance with claim 1, and means connecting the output paths of said two circuits in series across the balanced load.
References Cited by the Examiner UNITED STATES PATENTS 3,010,078 11/1961 Stefanov 331-113 X 3,183,432 5/1965 Pintell 3,197,691 7/1965 Gilbert 3218 JOHN F. COUCH, Primary Examiner.
W. H. BEHA, Assistant Examiner.

Claims (1)

1. AN ELECTRIC CIRCUIT FOR SUPPLYING A SUBSTANTIALLY CONSTANT UNIDIRECTIONAL CURRENT TO A LOAD, SAID CIRCUIT COMPRISING (I) AN ALTERNATING CURRENT GENERATOR, THE FREQUENCY OF WHICH IS VARIABLE OVER A PREDETERMINED RANGE, (II) A PASSIVE NETWORK HAVING A FREQUENCY RESPONSE THAT VARIES LINEARLY AT LEAST OVER SAID RANGE OF FREQUENCIES, (III) A POWER AMPLIFIER, (IV) MEANS CONNECTING THE OUTPUT OF THE GENERATOR TO THE INPUT OF SAID AMPLIFIER BY WAY OF SAID NETWORK, (V) RECTIFIER MEANS TO DERIVE FROM THE OUTPUT SIGNAL OF THE AMPLIFIER, THE UNIDIRECTIONAL CURRENT WHICH IS TO BE PASSED TO THE LOAD, (VI) MEANS TO DERIVE A UNIDIRECTIONAL CONTROL VOLTAGE FROM SAID UNIDIRECTIONAL CURRENT, AND (VII) MEANS TO SUPPLY THE CONTROL VOLTAGE TO SAID GENERATOR TO CONTROL THE FREQUENCY THEREOF.
US279142A 1962-05-11 1963-05-09 Electric circuits for supplying a substantially constant current to a load Expired - Lifetime US3297880A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3400320A (en) * 1965-12-14 1968-09-03 Automatic Elect Lab Converter having diode rectifiers in a feedback voltage divider circuit for temperature compensation
US3619663A (en) * 1969-05-15 1971-11-09 Merestechnikai Kozponti Linearity error compensation circuit
US3686549A (en) * 1971-02-01 1972-08-22 Gen Motors Corp Power control system
US3906251A (en) * 1973-06-09 1975-09-16 Sony Corp Plurality of selective sources for converter system
US4213064A (en) * 1978-04-04 1980-07-15 Nasa Redundant operation of counter modules
US4728807A (en) * 1984-08-02 1988-03-01 Nec Corporation Power source system comprising a plurality of power sources having negative resistance characteristics

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2137780B (en) * 1983-02-10 1986-09-17 Newton Derby Ltd Current regulated power supply circuit
GB2320342A (en) * 1996-12-14 1998-06-17 Jonathan Hugh Lambert Copus Voltage supply circuit with stabilised output control

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3010078A (en) * 1959-09-21 1961-11-21 Kauke & Company Inc Voltage controlled frequency circuit
US3183432A (en) * 1961-08-18 1965-05-11 Intron Int Inc Voltage or current regulator
US3197691A (en) * 1962-01-02 1965-07-27 Gen Electric Regulated power supply

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2987664A (en) * 1958-05-23 1961-06-06 Ryan Aeronautical Co D. c. voltage regulator
US2991410A (en) * 1960-01-28 1961-07-04 Kaiser Ind Corp Static constant voltage d. c. to d. c. converter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3010078A (en) * 1959-09-21 1961-11-21 Kauke & Company Inc Voltage controlled frequency circuit
US3183432A (en) * 1961-08-18 1965-05-11 Intron Int Inc Voltage or current regulator
US3197691A (en) * 1962-01-02 1965-07-27 Gen Electric Regulated power supply

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3400320A (en) * 1965-12-14 1968-09-03 Automatic Elect Lab Converter having diode rectifiers in a feedback voltage divider circuit for temperature compensation
US3619663A (en) * 1969-05-15 1971-11-09 Merestechnikai Kozponti Linearity error compensation circuit
US3686549A (en) * 1971-02-01 1972-08-22 Gen Motors Corp Power control system
US3906251A (en) * 1973-06-09 1975-09-16 Sony Corp Plurality of selective sources for converter system
US4213064A (en) * 1978-04-04 1980-07-15 Nasa Redundant operation of counter modules
US4728807A (en) * 1984-08-02 1988-03-01 Nec Corporation Power source system comprising a plurality of power sources having negative resistance characteristics

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GB959620A (en) 1964-06-03

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