US3826970A - Device for use in varying output voltage - Google Patents

Device for use in varying output voltage Download PDF

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Publication number
US3826970A
US3826970A US39106873A US3826970A US 3826970 A US3826970 A US 3826970A US 39106873 A US39106873 A US 39106873A US 3826970 A US3826970 A US 3826970A
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United States
Prior art keywords
potential
capacitor
transistor
field effect
collector
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Expired - Lifetime
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English (en)
Inventor
S Oka
S Minami
T Takemura
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K4/00—Generating pulses having essentially a finite slope or stepped portions
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F3/00—Non-retroactive systems for regulating electric variables by using an uncontrolled element, or an uncontrolled combination of elements, such element or such combination having self-regulating properties
    • G05F3/02—Regulating voltage or current
    • G05F3/08—Regulating voltage or current wherein the variable is DC
    • G05F3/10—Regulating voltage or current wherein the variable is DC using uncontrolled devices with non-linear characteristics
    • G05F3/16—Regulating voltage or current wherein the variable is DC using uncontrolled devices with non-linear characteristics being semiconductor devices
    • G05F3/20—Regulating voltage or current wherein the variable is DC using uncontrolled devices with non-linear characteristics being semiconductor devices using diode- transistor combinations

Definitions

  • the POtemial at a first Output terminal connected to the collector of the PNP transistor will 52 us. c1 323/19, 307/39, 307/296, be increased, while the potential at a second Output 323/23 terminal connected to the NPN transistor will be low- 51 1111.01. 00st 3/08 ered-
  • 5 Field f Search 307 3 39 139 141 223 then the potential at the first and second output termi- 307/251, 255, 264, 279, 296, 297; 323/8, 16, nals will be varied in the reverse fashion to that de- 19 22 R 22 T; 323/151 scribed earlier.
  • the gradual variation in the charged level of the condenser may provide a 5 References Ci gradual variation in the voltage across both of the out- UNlTED STATES PATENTS Put ermmali 3,447,103 2 Claims, 5 Drawing Figures 5/1969 Port 307/279 X PATENTEUJUL30 m4 SHEET 1 0F 2 E G 2 M L O G V II- D E F T A R V U W M aw s D v v E G M L O V Cl F w U C m 0 GATE VOLTAGE TN VOLT E z .Emmmzo moPomjooTv COLLECTOR CURRENT IN mA 0 BASE CURRENT IN mA FIG. 5
  • This invention relates to a device for use in varying the output voltage, and more particularly, to a noncontact type device for use in gradually varying an output voltage.
  • variable resistor is generally known as a device for use in varying an output voltage.
  • a device for use in varying an output voltage.
  • such a device possesses inherent limitations because of the use of mechanical contacts and, in addition, fails to serve a useful function for some applications, as the case maybe.
  • a condenser is connected between the ground and the gate of the MOS type field effect transistor (which will be referred to as FET hereinafter).
  • the base of an NPN transistor is connected to the source of the aforesaid F ET and the base of a PNP transistor is connected to the drain of the aforesaid FET.
  • the output from the device of the invention may be obtained between one terminal which is connected to the collector of the aforesaid PNP transistor and another terminal which is connected to the collector of the aforesaid NPN transistor.
  • FIG. 1 is an electric circuit of an output-voltagevariable device as used in one embodiment of the invention
  • FIG. 2 is a plot showing the relationship of the voltage variation to the gate voltages of the MOS type field effect transistor at the points A and B shown in FIG. 1;
  • FIG. 3 is a plot showing characteristics of a collector current versus those of the base current of a PNP transistor
  • FIG. 4 is a plot showing characteristics of a collector current versus those of a base current of a NPN transistor.
  • FIG. 5 is a plot showing the voltage variation appearing at the output terminals, as the gate voltage at the MOS type field effect transistor is varied in the circuit of FIG. 1.
  • FIG. 1 shown at l and 2 are a positive and a negative terminal which are connected to the positive and negative electric power sources (not shown), respectively.
  • Designated at 3 is a central terminal adapted to contact with, or to be detached from the aforesaid contacts 1 and 2.
  • Shown at 4 is an input resistor which is interposed between the central terminal and the gate of a MOS type FET 5.
  • Represented by 6 is a non-polar condenser, one end of which is connected to the gate of the aforesaid FET 5 and the other end of which is connected to the ground.
  • Shown at 7 is a drain resistor connected between a DC.
  • Shown at 9 is a NPN transistor, whose base is connected through a resistor 10 to the source of the MOS type FET, while the collector thereof is connected through a resistor 11 to the aforesaid D.C. electric power source V and the emitter thereof is grounded.
  • Shown at 12 is a PNP transistor, whose base is connected through a resistor 13 to the drain of the MOS type FET, while the emitter thereof is connected to the DC. electric power source V the collector thereof being grounded via a resistor 14.
  • Designated at 15 is an output terminal provided on the collector side of the transistor 9, and at 16, an output terminal provided on the collector side of thetransistor 12.
  • the potential at the point A on the drain side of the transistor 5 will be the potential at the voltage of the DC. source V since there is no currentflowing through the resistor 7.
  • the potential at the point B on the source side of the transistor 5 will be zero, because there is no current-flowing through the resistor 8.
  • the potential at the point B on the source side of the FET 5 will be increased to a higher level from zero due to the current-flowing through the resistor 8.
  • the central terminal 3 is brought into an off-condition at an arbitrary time under such conditions, then the current flow through the resistor will be interrupted, thereby maintaining constant the electric charge which has been accumulated in the condenser thus far. In other words, this maintains at a constant value, the potential difference between the points A and B.
  • the electric charge in the condenser 6 will be decreased, i.e., the gate voltage at the MOS type field effect transistor will be lowered, while the current will be decreased in amount until the transistor 5 is brought into a cut-off condition.
  • This then causes the potential at the point A to increase up to the voltage V at the DC electric power source, while lowering the potential at the point B to zero potential.
  • the central terminal 3 is set to the offposition, then the potentials at the points A and B will be maintained to given values, commensurate to the voltages thus generated.
  • the drain current may be set to a position between the cut-off condition and the saturated condition of the MOS type FET 5, by applying +V,- or V,- voltage to the central terminal 3 or by bringing the central terminal 3 into an off-condition.
  • the resistances of the resistor 7 and resistor 8 be R and R are of equal values and that the internal resistance (r) at the time of the saturation created between the drain and the source of the MOS type Since R1VD/R7 r R3 RgV /R- r R3 V /Z, then,
  • FIG. 2 shows the relationship of V V to the gate voltage of the F ET 5.
  • the voltage V is lowered as the gate voltage increases, while the voltage V is increased therewith.
  • FIGS. 3 and 4 show collector current characteristics to the base currents of the PNP transistor 12 and NPN transistor 9;
  • the central terminal 3 when the central terminal 3 is connected to the positive terminal 1 or the negative terminal 2, then the potential at one output terminal will be increased from zero, and the potential at-the other terminal will be lowered from +V,,. It follows that the charge or discharge of the condenser 6 may create avoltage of an arbitrary value between the both terminals. In addition to this, the outputvoltage therebetween may be maintained to a given value at an arbitrary time.
  • the output voltage variable device of the present invention thus constructed provides a wider range of application.
  • a further advantage thereof is that the device of the present invention may be operated in a manner analogous to conventional type variable resistors while enabling non-contact operation. 7
  • a device for use in varying an output voltage comprising an MOS field effect transistor having a source, a gate and a drain; a capacitor; means for selectively charging and discharging said capacitor to a plurality of arbitrary potentials; means for connecting said capacitor across said gate and source of said field effect transistor; whereby the potential across the capacitor is provided across the gate and source of the field effect transistor; an NPN transistor having a base, an emitter and a collector; means for connecting the base of the NPN transistor to the source of the field effect transistor; a PNP transistor having a base, anemitter and a collector; means for connecting the base of the PNP transistor to the drain of said field effect transistor; and separate output terminals connected to the collectors of the NPN and PNP transistors; whereby upon the application of a positive bias across the source and drain of the field effect transistor, across the collector and emitter of the NPN transistor and across the emitter and collector of the PNP transistor, the collector current of the PNP transistor varies directly and the collector current of the NPN
  • said means for selectively charging and discharging said capacitor comprises means for providing a positive potential, means for providing a negative potential, and switch means connected to said capacitor for selectively connecting said capacitor to said means for providing said positive potential, to said means for providing said negative potential and for disconnecting said capacitor from any low impedance discharge path, whereby said capacitor may be charged and discharged to any arbitrary potential and whereby said potential may be selectively retained on said capacitor.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Nonlinear Science (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Electrical Variables (AREA)
  • Control Of Amplification And Gain Control (AREA)
  • Electronic Switches (AREA)
  • Amplifiers (AREA)
US39106873 1972-08-29 1973-08-24 Device for use in varying output voltage Expired - Lifetime US3826970A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8682372A JPS4943552A (enExample) 1972-08-29 1972-08-29

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US3826970A true US3826970A (en) 1974-07-30

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US (1) US3826970A (enExample)
JP (1) JPS4943552A (enExample)
CA (1) CA999936A (enExample)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3925720A (en) * 1972-12-20 1975-12-09 Matsushita Electric Industrial Co Ltd Device for varying output voltage within a limited range
US3952241A (en) * 1973-02-20 1976-04-20 Matsushita Electric Industrial Co., Ltd. Electronic power varying controller device
US4736116A (en) * 1986-05-16 1988-04-05 Denning Mobile Robotics, Inc. Power-up sequencing apparatus
FR2620836A1 (fr) * 1987-09-21 1989-03-24 Thomson Semiconducteurs Source d e courant ajustable et convertisseur numerique/analogique a auto-calibration utilisant une telle source

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3447103A (en) * 1966-12-19 1969-05-27 Bell Telephone Labor Inc System for initially adjusting a signal equalizing device
US3458711A (en) * 1967-08-10 1969-07-29 Bell Telephone Labor Inc Dynamic voltage balancing circuit
US3550088A (en) * 1967-07-21 1970-12-22 Telephone Mfg Co Control means for transistor switching matrix circuits
US3703678A (en) * 1971-05-12 1972-11-21 Bell Telephone Labor Inc Isolating power supply

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3447103A (en) * 1966-12-19 1969-05-27 Bell Telephone Labor Inc System for initially adjusting a signal equalizing device
US3550088A (en) * 1967-07-21 1970-12-22 Telephone Mfg Co Control means for transistor switching matrix circuits
US3458711A (en) * 1967-08-10 1969-07-29 Bell Telephone Labor Inc Dynamic voltage balancing circuit
US3703678A (en) * 1971-05-12 1972-11-21 Bell Telephone Labor Inc Isolating power supply

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3925720A (en) * 1972-12-20 1975-12-09 Matsushita Electric Industrial Co Ltd Device for varying output voltage within a limited range
US3952241A (en) * 1973-02-20 1976-04-20 Matsushita Electric Industrial Co., Ltd. Electronic power varying controller device
US4736116A (en) * 1986-05-16 1988-04-05 Denning Mobile Robotics, Inc. Power-up sequencing apparatus
FR2620836A1 (fr) * 1987-09-21 1989-03-24 Thomson Semiconducteurs Source d e courant ajustable et convertisseur numerique/analogique a auto-calibration utilisant une telle source
EP0309365A1 (fr) * 1987-09-21 1989-03-29 STMicroelectronics S.A. Source de courant ajustable et convertisseur numérique/analogique à auto-calibration utilisant une telle source
US4914440A (en) * 1987-09-21 1990-04-03 Sgs-Thomson Microelectronics S.A. Adjustable current source and digital/analog converter with autocalibration using such a source

Also Published As

Publication number Publication date
JPS4943552A (enExample) 1974-04-24
DE2343565B2 (de) 1977-04-28
CA999936A (en) 1976-11-16
DE2343565A1 (de) 1974-03-21

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