EP0031987A1 - Source de tension de référence pour une source de tension continue stabilisée - Google Patents

Source de tension de référence pour une source de tension continue stabilisée Download PDF

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Publication number
EP0031987A1
EP0031987A1 EP80300052A EP80300052A EP0031987A1 EP 0031987 A1 EP0031987 A1 EP 0031987A1 EP 80300052 A EP80300052 A EP 80300052A EP 80300052 A EP80300052 A EP 80300052A EP 0031987 A1 EP0031987 A1 EP 0031987A1
Authority
EP
European Patent Office
Prior art keywords
output voltage
voltage
power source
regulated power
source apparatus
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.)
Granted
Application number
EP80300052A
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German (de)
English (en)
Other versions
EP0031987B1 (fr
Inventor
Ryoji Imazeki
Masayuki Hattori
Shigeo Nakamura
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.)
Fanuc Corp
Original Assignee
Fanuc Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fanuc Corp filed Critical Fanuc Corp
Priority to EP80300052A priority Critical patent/EP0031987B1/fr
Priority to DE8080300052T priority patent/DE3071548D1/de
Publication of EP0031987A1 publication Critical patent/EP0031987A1/fr
Application granted granted Critical
Publication of EP0031987B1 publication Critical patent/EP0031987B1/fr
Expired legal-status Critical Current

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    • 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
    • G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/468—Regulating voltage or current wherein the variable actually regulated by the final control device is dc characterised by reference voltage circuitry, e.g. soft start, remote shutdown

Definitions

  • This invention relates to a DC regulated power source apparatus, and more particularly to a DC regulated power source incorporated in an electronic device.
  • Electronic devices such as communications equipment or sequence controllers and numerical control units for controlling machine tools, generally incorporate a DC regulated power source device which supplies their electronic components with a regulated DC voltage.
  • DC regulated power sources include a reference power source for generating a reference voltage, as well as an output voltage control element.
  • the output voltage control element constantly compares the output voltage against the reference voltage and functions to hold the output voltage constant at all times by restoring the output voltage to the reference voltage when the former attempts to rise, or by raising the output voltage up to the reference voltage when the former attempts to drop.
  • the DC regulated power source devices referred to above usually produce the reference voltage through use of a Zener diode.
  • Zener voltages can differ slightly even for Zener diodes of the same type or grade, using the voltage obtained from such diodes as a reference voltage results in irregularities among the devices that receive the output voltage from the DC regulated apparatus. It is therefore conventional practice to employ a Zener diode of a higher Zener voltage than the reference voltage, and to divide this high Zener voltage down to an accurate reference voltage by means of a potentiometer.
  • a DC regulated power source apparatus for controlling an output voltage so as to limit the difference between the output voltage and a reference voltage to zero
  • apparatus comprises a differential amplifier for detecting a difference in voltage between the reference voltage and output voltage, and a voltage control circuit responsive to an output signal from said differential amplifier to control the output voltage in such a direction as will limit said difference in voltage to zero, characterised by first output voltage varying means for setting the output voltage to a prescribed value, and second output voltage varying means for temporarily shifting to a preset value the output voltage which has been set to said prescribed value by said first output voltage varying means.
  • An embodiment of this invention can provide a DC regulated power source apparatus for incorporation - in a variety of electronic equipment,. the output of which apparatus can be finely adjusted to correct for discrepancies in the reference voltage of a reference power source, and which allows the output voltage to be shifted to a preset value by an operation command signal which does not require the intervention of an operator, or by a simple switching procedure performed by an operator.
  • An embodiment of the present invention can provide a DC regulated power source apparatus those output voltage can be finely adjusted in a continuous manner.
  • An embodiment of the present invention can provide a DC regulated power source apparatus whose output voltage, which has been adjusted to a prescribed value, can be shifted manually or automatically by a fixed amount.
  • An embodiment of the present invention can provide a DC regulated power source apparatus which, when the output voltage is shifted to a fixed voltage that is higher than a prescribed value, minimizes any error in the output voltage even if a reference voltage fluctuates.
  • FIG. 1 Illustrated in Fig. 1 is a functional block diagram of a typical DC regulated power source apparatus which has long been known in the art.
  • the apparatus includes a rectifying and smoothing circuit 1, a voltage control circuit 2, a differential amplifier 3, and a reference voltage power source 4 which supplies a reference voltage E S .
  • the differential amplifier 3 detects a difference in voltage between the reference voltage E S and an output voltage V o , and responds by controlling the voltage control circuit 2 in such a manner that the difference in voltage is limited to zero, thereby equalizing the output voltage V D and reference voltage E S at all times.
  • a Zener diode is employed in the reference voltage power source 4..
  • Zener diodes may be of an identical type or grade, it is common for such diodes to provide Zener voltages which differ from one another to an extremely small degree. A prescribed voltage therefore cannot be obtained with the apparatus of F ig. 1 as long as it is not possible to acquire Zener diodes which can provide Zener voltages which are identical to the reference voltage E S . It is for this reason that the systems shown in Figs. 2 and 3 are adopted in the prior art.
  • a rheostat 5 is employed to divide'the reference voltage E S , with the output voltage Vo being adjusted to a desired value within the range of the reference voltage E S .
  • the output voltage Vô is adjusted to a prescribed voltage through multiplying the reference voltage E S by the ratio of the resistance value R of rheostat 5 to the divided resistance r.
  • the present invention is based upon the DC regulated power source apparatus of the types shown in Figs. 1 through 3, in which a differential amplifier is used to compare an output voltage against a reference voltage, with a voltage control circuit being controlled in response to the output of the differential amplifier to hold the output voltage of the apparatus at a prescribed value.
  • Fig. 4 is a circuit diagram illustrating an embodiment of the present invention.
  • the arrangement includes a rectifying and smoothing circuit 11, a voltage control circuit 12, a differential amplifier 13, a reference power source 14, a variable resistor 15, a total resistance R, a three-point type switch 16, and rheostats 17, 18 having respective resistance values of R 1 and R 2 .
  • the arrangement of Fig. 4 operates as follows. Movable contact a of switch 16 ordinarily is switched to neutral pole N.
  • the output voltage V o " is set to the reference value as in the prior art by adjusting the rheostat 15 to change the dividing ratio a.
  • the reference voltage E s of the reference voltage source 14 is preset to a value which is higher than the operating voltage of the electronic circuitry, such as a value which is twice the operating voltage.
  • the above equation shows that the output voltage V o " drops to a fixed value by varying the dividing ratio a until it attains the value a Le
  • the fixed value to which the output voltage V o " drops can be varied by changing the value of R 1 through adjustment of the rheostat 17. Restoring the output voltage Vo" to the original value can be accomplished merely by switching the movable contact a back to the neutral position N.
  • the above equation shows that the output voltage V " rises to a'fixed value by varying the dividing ratio until it attains the value ⁇ H .
  • the fixed value to which the output voltage V o " rises can be varied by changing the value of R 2 through adjustment of the rheostat 18.
  • the output voltage V o " can be restored to the original value merely by switching the movable contact a back to the neutral position N.
  • the movable contact a can be switched over manually or automatically through the use of suitable drive means.
  • suitable drive means One example in which the latter can be accomplished is by means of an electromagnetic switch whose contact is adapted to be-switched over by an electromagnetic force.
  • a switching circuit is designated generally at 19, the circuit including stationary contacts h, n, l, a movable contact M, and a drive circuit 191 for actuating the movable contact M .
  • Drive circuit 191 has a signal input terminal S. Movable contact M is switched to stationary contact n when signal input terminal S is at zero potential, to stationary contact h when input terminal S is at a positive potential (+5 volts), and to stationary contact 1 when input terminal S is at a negative potential (-5 volts).
  • Rheostat 17 is connected to stationary contact 1, and semi-fixed variable resistor 18 to stationary contact h.
  • An OR gate 20 has its output side connected to the signal input terminal S of drive circuit 191, and has one input terminal X connected to a driving signal generator and its other input terminal connected to the variable contact of three-point switch 21. Sources of +5 and -5 volt signals are shown at 23 and 22, respectively.
  • a -5 volt signal from the driving signal generator is applied to the input terminal X of OR gate 20, whereupon the signal is delivered to drive circuit 191 through the OR gate.
  • Drive circuit 191 responds by switching the movable contact M to the stationary contact k, whereby the output voltage is shifted downward by a fixed value as in the foregoing embodiment.
  • a +5 volt signal from the driving signal generator is applied to the input terminal X of OR gate 20, whereupon the signal is delivered to drive circuit 191 through the OR gate.
  • Drive circuit 191 now responds by switching the movable contact M to the stationary contact h, whereby the output voltage is shifted upward by a fixed value as in the foregoing embodiment. On the other hand, no signals are delivered to drive circuit 191 from the driving signal generator when the output voltage is to be maintained at the prescribed value. On such occasions the movable contact M is switched to the stationary contact n. If it is now desired to shift the output voltage upward or downward by a fixed value through a manual instead of the automatic method, the three-point switch 21 need only be manipulated by hand to apply the +5 volt signal or -5 volt signal to drive circuit 191.
  • the range over which the output voltage is shifted from the reference value, that is, upward or downward from the reference value by the fixed value is decided by the value of the reference voltage E s , the value of the resistors, r l , r 2 , and the value of resistor R i or R 2 .
  • Fig. 6 shows a simplification of the circuitry of the two foregoing embodiments in order to simplify the description of the invention. It should first be noted that and where The range ⁇ V o " over which the output voltage is varied in the circuit of Fig. 6 is defined by the following: where ⁇ V oL represents downward change when the output voltage is lowered by a fixed value from the prescribed value, and where ⁇ V" oL represents upward change when the output voltage is raised by a fixed value from the prescribed value.
  • E e is a separate power source of a higher voltage than E o , and is suitably regulated by a Zener diode or the like.
  • the range V"' oH over which the output voltage is varied when terminals H and T are interconnected is given by the following equation, If E e is suitably stabilized to a greater extent that Eo , then the / only fluctuation in ⁇ V" oH will be due to r o (where r o is a function of E s , V" o , and R.) This fluctuation due to r o can be substantially suppressed by adopting the circuit shown in Fig.
  • the present invention includes first output voltage varying means for setting an output voltage to a prescribed value, thereby allowing a variance in reference voltage to be corrected.
  • the invention further includes second output voltage varying means for temporarily shifting the prescribed output voltage, set by the first varying means, to a preset value, thereby allowing the output voltage to be shifted through a simple operation whenever maintenance and inspection are.performed. This eliminates the troublesome adjustment procedure encountered in the prior art, wherein adjustment must be performed while a voltmeter is observed.
  • actuating the output voltage varying means by an externally applied signal allows a test step for confirming circuit operating margin to be inserted into a series of automated test steps.
  • two reference voltage sources may be used to provide a voltage difference which is divided down to a voltage that may then be employed as the'reference voltage which is applied to a differential amplifier.
  • the shifted voltage will therefore attain a value in conformance with the planned value.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Continuous-Control Power Sources That Use Transistors (AREA)
EP80300052A 1980-01-04 1980-01-04 Source de tension de référence pour une source de tension continue stabilisée Expired EP0031987B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP80300052A EP0031987B1 (fr) 1980-01-04 1980-01-04 Source de tension de référence pour une source de tension continue stabilisée
DE8080300052T DE3071548D1 (en) 1980-01-04 1980-01-04 Reference voltage generating circuit in dc regulated power source apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP80300052A EP0031987B1 (fr) 1980-01-04 1980-01-04 Source de tension de référence pour une source de tension continue stabilisée

Publications (2)

Publication Number Publication Date
EP0031987A1 true EP0031987A1 (fr) 1981-07-15
EP0031987B1 EP0031987B1 (fr) 1986-04-16

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Family Applications (1)

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EP80300052A Expired EP0031987B1 (fr) 1980-01-04 1980-01-04 Source de tension de référence pour une source de tension continue stabilisée

Country Status (2)

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EP (1) EP0031987B1 (fr)
DE (1) DE3071548D1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0103455A2 (fr) * 1982-09-10 1984-03-21 Fujitsu Limited Circuit pour source de puissance
FR2654232A1 (fr) * 1989-11-07 1991-05-10 Europ Rech Electr Lab Generateur de tensions continues pour l'alimentation d'une carte a circuit integre.
WO1993006540A1 (fr) * 1991-09-25 1993-04-01 Astec International Limited Circuit de programmation lineaire pour convertisseurs de courant a tension de sortie reglable

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4114073C3 (de) * 1991-04-30 2001-07-05 Bosch Gmbh Robert Schaltungsanordnung zur Stabilisierung einer Spannung

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3566252A (en) * 1968-10-01 1971-02-23 Forbro Design Corp Method of and means for digital programming of regulated power supplies
US3577064A (en) * 1969-03-12 1971-05-04 Forbro Design Corp Automatic error detection and indication in a remotely programmable regulated power supply

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3566252A (en) * 1968-10-01 1971-02-23 Forbro Design Corp Method of and means for digital programming of regulated power supplies
US3577064A (en) * 1969-03-12 1971-05-04 Forbro Design Corp Automatic error detection and indication in a remotely programmable regulated power supply

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
ELECTRONIC DESIGN, Vol. 25, No. 7, 29th March 1977, page 104 Rochelle Park, U.S.A. G. BUURMA: "Simple CMOS keyboard encoder circuit" * Whole article * *
ELECTRONICS, Vol. 50, No. 15, 21st July 1977, page 125 New York, U.S.A. C. VISWANATH: "D-a converter controls programmable power source" * Whole article * *
ELECTRONIQUE & MICROELECTRONIQUE INDUSTRIELLES, No. 162, 15th October 1972, pages 57-60 Paris, FR. C. BOISARD: "Un CI regulateur de vitesse" * Page 59, paragraphe: "Regulation de vitesse et commutation electrique de vitesse nominale"; figures 4,5 * *
ELEKTOR, Vol. 2, No. 7/8, July/August 1976, pages 739-740 Canterburry, G.B. G. EBNER: "0-30 V/1 A, stabilised" * Whole article * *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0103455A2 (fr) * 1982-09-10 1984-03-21 Fujitsu Limited Circuit pour source de puissance
EP0103455A3 (fr) * 1982-09-10 1984-07-11 Fujitsu Limited Circuit pour source de puissance
FR2654232A1 (fr) * 1989-11-07 1991-05-10 Europ Rech Electr Lab Generateur de tensions continues pour l'alimentation d'une carte a circuit integre.
WO1991007056A1 (fr) * 1989-11-07 1991-05-16 Deutsche Thomson-Brandt Gmbh Procede et dispositif d'activation d'une carte a memoire
US5265161A (en) * 1989-11-07 1993-11-23 Deutsche Thomson-Brandt Gmbh Process and device for activating a chip card
WO1993006540A1 (fr) * 1991-09-25 1993-04-01 Astec International Limited Circuit de programmation lineaire pour convertisseurs de courant a tension de sortie reglable

Also Published As

Publication number Publication date
DE3071548D1 (en) 1986-05-22
EP0031987B1 (fr) 1986-04-16

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