US3742338A - Dc voltage regulator circuit - Google Patents

Dc voltage regulator circuit Download PDF

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Publication number
US3742338A
US3742338A US00232792A US3742338DA US3742338A US 3742338 A US3742338 A US 3742338A US 00232792 A US00232792 A US 00232792A US 3742338D A US3742338D A US 3742338DA US 3742338 A US3742338 A US 3742338A
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US
United States
Prior art keywords
transistor
base
voltage
emitter
circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00232792A
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English (en)
Inventor
H Sugano
A Tanaka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
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Matsushita Electronics Corp
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Publication date
Application filed by Matsushita Electronics Corp filed Critical Matsushita Electronics Corp
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Publication of US3742338A publication Critical patent/US3742338A/en
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    • 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
    • G05F3/18—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices using Zener diodes

Definitions

  • FIG. 1 A first figure.
  • the present invention relates to a dc voltage regulator circuit which is connected to a dc power supply and which delivers a stabilized output to a load connected thereto even if there is a variation in the voltage of the dc power supply or in the load.
  • a power supply as a bias voltage source which can supply a constant output voltage irrespective of the variation in the voltage of the power supply or in the load connected thereto.
  • FIG. 1 shows a conventional regulator circuit for constant voltage supply
  • FIG. 2 shows a dc voltage regulator circuit according to the invention.
  • FIG. 1 which illustrates a prior-art regulator circuit
  • numerals 1, 2, 3, 4, and 6 respectively designate a terminal connected to a power supply (not shown), a zener diode, a resistor for conducting current to the zener diode, a transistor in emitter-follower configuration, an emitter resistor for the transistor and an output terminal.
  • the variation in the output voltage due to the variation in the voltage of the power supply or in the connected load can indeed be suppressed, but, strictly speaking, there will be a variation, though very small, in the output voltage if there is a variation in the power supply voltage.
  • the present invention has been made to solve the problem just mentioned which is often raised with the prior-art regulator circuit, and it is characterized by a circuit for supplying current for the zener diode which current is not affected by the variation in the power supply voltage, the circuit being able to deliver a stabilized output voltage.
  • circuit elements designated by numerals 1 are identical to circuit elements 1 in FIG. 2, circuit elements designated by numerals 1,
  • resistors 7 and 8 divide the voltage across a zener diode 2; a transistor 9 and a resistor 10 constitute an emitter-follower circuit; a transistor 11 forms a circuit for delivering a constant current by using the voltage available at the emitter of the transistor 9 as base bias voltage of the transistor 11; resistors 12 and 13 serve respectively as the emitter and collector resistors for the transistor 11; a diode 14 is inserted for temperature compensation; a transistor 15 and a resistor 16 form a circuit for supplying a constant current for the zener diode 2; and a resistor 17 conducts the initial current to the zener diode 2.
  • the operation of this circuit to obtain a stabilized output voltage is as follows.
  • the collector current of the transistor 11 is kept constant, and since the base bias voltage of the transistor 15 also depends on the constant current, the collector current of the transistor 15 and therefore the current to the zener diode 2 is kept constant.
  • the zener voltage of the reference diode 2 is scarcely affected by the variations in current and voltage but assumes a constant value. Consequently, the output voltage appearing at the terminal 6 will not fluctuate notwithstanding the variation in the voltage of the power supply so that a very stable power source can be provided.
  • the resistor 17 serves to conduct the initial current to the reference diode, i.e., silicon zener diode 2, and is considered to be an indispensable circuit element.
  • the value of the resistance which the resistor 17 is to possess, must be very carefully chosen.
  • the resistance value of the resistor 17 should be so chosen such that the current flowing through the resistor 17 may be sufficiently small in comparison with the collector current of the transistor 15.
  • the current flowing through the resistor 17 must have at least such a value as can produce an output voltage at the terminal 6 when a voltage is applied to the terminal 1.
  • the output of the dc voltage regulator circuit according to the invention is not affected by the variation in the voltage of the power supply connected thereto and therefore is effectively used to supply a constant voltage for a transistorized electronic circuit.
  • means for stabilizing the voltage at the output terminal comprising a current control transistor having an input base and an output collector connected to the zener diode for controlling the supply of base current to the base of the emitter follower, bias voltage control means connected to the input base of the control transistor for maintaining said base current constant, means connected to the output terminal for supplying a reference voltage to the bias voltage control means, and initial current conducting means connecting the input terminal to the base of the emitter follower for instantaneously rendering the emitter follower conductive to establish said reference voltage.
  • said reference voltage supply means comprises a voltage divider connected to the output terminal, and an emitter follower circuit connecting the voltage divider to the bias voltage control means.
  • bias voltage control means comprises a constant current conducting transistor having collector and emitter circuits connected in parallel with said emitter follower circuit and a base connected to an output of the emitter fol lower circuit, the collector circuit of the constant current conducting transistor being connected to the input base of the control transistor.
  • said initial current conducting means comprises a resistor connected to the input terminal.
  • a dc voltage regulator comprising power supply and output terminals, a first transistor having a collector and an emitter connected respectively to said power supply terminal and said output terminal and a base, a reference diode connected between the base of said first transistor and ground, parallel circuits consisting of a resistor and a second transistor, said parallel circuits being connected between the power supply terminal and the base of said first transistor, a voltage divider circuit connected in series with the emitter of said first transistor, a third transistor having an emitter, a collector connected to the power supply terminal and a base connected to said voltage divider circuit, the output from the emitter of said third transistor being coupled to the base of said second transistor to control base bias voltage applied to said second transistor.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Nonlinear Science (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Continuous-Control Power Sources That Use Transistors (AREA)
  • Control Of Electrical Variables (AREA)
US00232792A 1971-03-15 1972-03-08 Dc voltage regulator circuit Expired - Lifetime US3742338A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1448171 1971-03-15

Publications (1)

Publication Number Publication Date
US3742338A true US3742338A (en) 1973-06-26

Family

ID=11862230

Family Applications (1)

Application Number Title Priority Date Filing Date
US00232792A Expired - Lifetime US3742338A (en) 1971-03-15 1972-03-08 Dc voltage regulator circuit

Country Status (5)

Country Link
US (1) US3742338A (de)
CA (1) CA980858A (de)
DE (1) DE2212275C3 (de)
FR (1) FR2130217B1 (de)
GB (1) GB1343251A (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3881150A (en) * 1972-11-20 1975-04-29 Motorola Inc Voltage regulator having a constant current controlled, constant voltage reference device
US4230980A (en) * 1978-05-24 1980-10-28 Fujitsu Limited Bias circuit
US4242629A (en) * 1978-12-01 1980-12-30 Westinghouse Electric Corp. DC Switching voltage regulator with extended input voltage capability
US4283674A (en) * 1978-07-19 1981-08-11 Hitachi, Ltd. Constant voltage output circuit
DE3402342A1 (de) * 1984-01-24 1985-08-01 Siemens AG, 1000 Berlin und 8000 München Vorlastschaltung fuer ein geregeltes stromversorgungsgeraet
US4916389A (en) * 1982-12-17 1990-04-10 Hitachi, Ltd. Semiconductor integrated circuit with voltage limiter having different output ranges from normal operation and performing of aging tests
US5493572A (en) * 1981-04-17 1996-02-20 Hitachi, Ltd. Semiconductor integrated circuit with voltage limiter having different output ranges for normal operation and performing of aging tests
USRE35313E (en) * 1981-04-17 1996-08-13 Hitachi, Ltd. Semiconductor integrated circuit with voltage limiter having different output ranges from normal operation and performing of aging tests
US5566185A (en) * 1982-04-14 1996-10-15 Hitachi, Ltd. Semiconductor integrated circuit
US20090295358A1 (en) * 2008-06-02 2009-12-03 Fairchild Korea Semiconductor Ltd. Driving Device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103941797B (zh) * 2014-04-17 2016-01-20 锐迪科创微电子（北京）有限公司 射频天线开关稳压电路

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1909040A1 (de) * 1968-02-29 1970-02-26 Goerz Electro Gmbh Stabilisierungsschaltung mit einer Zenerdiode und zwei Transistoren

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3881150A (en) * 1972-11-20 1975-04-29 Motorola Inc Voltage regulator having a constant current controlled, constant voltage reference device
US4230980A (en) * 1978-05-24 1980-10-28 Fujitsu Limited Bias circuit
US4283674A (en) * 1978-07-19 1981-08-11 Hitachi, Ltd. Constant voltage output circuit
US4242629A (en) * 1978-12-01 1980-12-30 Westinghouse Electric Corp. DC Switching voltage regulator with extended input voltage capability
US5493572A (en) * 1981-04-17 1996-02-20 Hitachi, Ltd. Semiconductor integrated circuit with voltage limiter having different output ranges for normal operation and performing of aging tests
USRE35313E (en) * 1981-04-17 1996-08-13 Hitachi, Ltd. Semiconductor integrated circuit with voltage limiter having different output ranges from normal operation and performing of aging tests
US5566185A (en) * 1982-04-14 1996-10-15 Hitachi, Ltd. Semiconductor integrated circuit
US5712859A (en) * 1982-04-14 1998-01-27 Hitachi, Ltd. Semiconductor integrated circuit
US4916389A (en) * 1982-12-17 1990-04-10 Hitachi, Ltd. Semiconductor integrated circuit with voltage limiter having different output ranges from normal operation and performing of aging tests
DE3402342A1 (de) * 1984-01-24 1985-08-01 Siemens AG, 1000 Berlin und 8000 München Vorlastschaltung fuer ein geregeltes stromversorgungsgeraet
US20090295358A1 (en) * 2008-06-02 2009-12-03 Fairchild Korea Semiconductor Ltd. Driving Device
US8258764B2 (en) 2008-06-02 2012-09-04 Fairchild Korea Semiconductor Ltd. Driving device

Also Published As

Publication number Publication date
DE2212275B2 (de) 1978-09-21
DE2212275C3 (de) 1983-11-10
FR2130217B1 (de) 1977-04-01
GB1343251A (en) 1974-01-10
FR2130217A1 (de) 1972-11-03
CA980858A (en) 1975-12-30
DE2212275A1 (de) 1972-09-28

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