US3707635A - Constant effective voltage power source circuit - Google Patents

Constant effective voltage power source circuit Download PDF

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Publication number
US3707635A
US3707635A US86399A US3707635DA US3707635A US 3707635 A US3707635 A US 3707635A US 86399 A US86399 A US 86399A US 3707635D A US3707635D A US 3707635DA US 3707635 A US3707635 A US 3707635A
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US
United States
Prior art keywords
capacitor
load
condition
switch means
voltage
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
US86399A
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English (en)
Inventor
Yoshichi Kawashima
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.)
Denso Corp
Original Assignee
NipponDenso Co Ltd
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 NipponDenso Co Ltd filed Critical NipponDenso Co Ltd
Application granted granted Critical
Publication of US3707635A publication Critical patent/US3707635A/en
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Classifications

    • 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
    • H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
    • H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
    • H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/1563—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators without using an external clock
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/24—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid
    • 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
    • G05F1/66—Regulating electric power

Definitions

  • a constant effective voltage power source circuit utilizing the charging and discharging of a capacitor. It includes an output voltage detection circuit having non-linear elements such as a diode and a constantvoltage diode which impart a parabolic current-voltage characteristic to the power source circuit.
  • the output voltage detection circuit functions to vary the charging current into. the capacitor, which is repeatedly charged and discharged to provide an effective output voltage, in accordance with the source voltage detected by it to contr'ol the effective output voltage to a constant value.
  • the source voltage of a power supply 3 appearing across input terminals 1 and 1 is applied across the heater 5 to heat the bimetal 6.
  • the bimetal contact 7 is opened. Subsequently, when the bimetal temperature is reducedto a certain value, the contact 7 is re-closed. The above cycle of events is repeated to maintain the output power constant.
  • the heater temperature is affected by the ambient temperature, so that its temperature characteristic is inferior Also, its service life is relatively short, because of the fact that the contact 7 is used. Further, the make-and-break of the contact 7 would give rise to noise in radio broadcasting. Furthermore, the cycle of make-and-break of the contact 7 is relatively long, so that the pointer 10a of the oil gauge oscillates. Moreover, time delay is involved from the closing of switch 4 until the heater 5 is sufficiently warmed up, so that the response characteristic is inferi- SUMMARY OF THE INVENTION It is an object of the invention to overcome the foregoing disadvantages by the provision of a transistorizcd constant output power source circuit.
  • Another object of the invention is to provide a constant effective voltage power source circuit comprising a transistor circuit to the on-off control current supplied to a load, a capacitor charged with load current, a switching circuit to on-off control said transistor circuit in accordance with the terminal voltage across said capacitor and an output voltage detection circuit including non-linear elements connected in the charging path of said capacitor.
  • the invention it is possible to provide a square-wave constant effective voltage output and minimize the power consumption of output transistors.
  • excellent effects can be featured in that inexpensive transistors consuming low power may be used and that the radiator plate for the output transistors may be made extremely small in size, which is very advantageous for the integration of the power source circuit.
  • FIG. 1 is a circuit diagram showing the conventional constant effective voltage power source circuit used in the oil gauge.
  • FIG. 2 is a circuit diagram showing a constant effective voltage power source circuit used in an oil gauge embodying the invention.
  • FIG. 3 shows the waveform of the output voltage of the constant effective voltage power source circuit according to the invention.
  • FIG. 4 is a graph showing a current-voltage characteristic approximating circuit according to the inventron.
  • FIG. 2 DESCRIPTION OF THE PREFERRED EMBODIMENT The invention will now be described in connection with a preferred embodiment thereof shown in FIG. 2.
  • Numeral 11 designates a variable resistor whose resistance is varied in accordance with, for instance, the quantity of oil in an oil tank.
  • Numeral 12 designates a resistor, numeral 13 a transistor, and numeral 14 a constant-voltage diode. These three elements constitute a compensating circuit to compensate for source voltage variations.
  • Numerals 16 and 17 designate transistors in Darlington connection to on-off control the load current.
  • Numeral 18 and 19 designate transistors in Darlington connection to on-off control the transistors 16 and 17.
  • the former transistors are connected through a resistor l5 across input terminals 1 and 1'.
  • Numerals 24 and 26 designate transistors constituting a Schmitt circuit to on-off control the transistors 18 and 19 in accordance with the terminal voltage across a capacitor 38.
  • Numeral 27 designates a constant-voltage diode, numerals 20, 23, 25 and 39 resistors, and numerals 21 and 22 diodes.
  • A is an output voltage detection circuit including non-linear elements. It comprises resistors 28, 37, 34 and 36, diodes 29, 30, 31, 32 and 33 and a constant-voltage diode 35.
  • V,,, is the source voltage
  • t is the charging time interval from the instant of cutting-off of the transistor 26 till the instant at which the terminal voltage across the capacitor 38 becomes sufficient to trigger the transistor 26 through the constant-voltage diode 27, and is the discharging time interval from the triggering till the cutting-off of the transistor 26 during which the terminal voltage across the capacitor 38 continues to decrease.
  • the preceding embodiment has concerned an automobile oil gauge as the load. It is, however, to be understood that the oil gauge is by no means limitative, but the invention may also be applied to an engine temperature gauge to detect and indicate the temperature of an engine on an automobile. In this case, the variable resistor 11 in the preceding embodiment may be replaced with a heat-sensitive element such as thermistor or posistor. Also, the invention is not limited to the automobile applications, but various other applications of the invention are possible.
  • a circuit for supplying constant power to a load comprising:
  • said non'linear resistive means further includes a third resistive branch connected in parallel with said first resistor comprising a plurality of diodes serially connected with said diode and a third resistor serially connected with said plurality of diodes and a fourth branch serially connected with said first resistor comprising a zener diode serially connected with said plurality of diodes and a fourth resistor serially connected with said zener diode.
  • a circuit for supplying constant power to a load comprising:
  • non-linear resistive means connecting said capacitor to said load so that the rate of charging of said capacitor varies as a function of the voltage at said load
  • a circuit for supplying constant power to a load comprising:
  • a load including an oil gauge and resistive means serially connected with said gauge having a resistance which varies as a function of the quantity of oil in a can,

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Electromagnetism (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Continuous-Control Power Sources That Use Transistors (AREA)
  • Measurement Of Current Or Voltage (AREA)
US86399A 1969-12-16 1970-11-03 Constant effective voltage power source circuit Expired - Lifetime US3707635A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP44101056A JPS4931260B1 (enrdf_load_stackoverflow) 1969-12-16 1969-12-16

Publications (1)

Publication Number Publication Date
US3707635A true US3707635A (en) 1972-12-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
US86399A Expired - Lifetime US3707635A (en) 1969-12-16 1970-11-03 Constant effective voltage power source circuit

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US (1) US3707635A (enrdf_load_stackoverflow)
JP (1) JPS4931260B1 (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3754182A (en) * 1972-10-02 1973-08-21 Litton Business Systems Inc Switching voltage regulator with input low voltage and output voltage detectors
US3808467A (en) * 1971-12-14 1974-04-30 Nippon Denso Co Effective voltage stabilizer
US3979610A (en) * 1975-01-27 1976-09-07 International Telephone And Telegraph Corporation Power regulator circuit
EP0334431A3 (en) * 1988-03-22 1990-01-31 Philips Patentverwaltung Gmbh Circuit arrangement for producing a consumer's pulse supply voltage from a dc voltage
EP0690552A3 (de) * 1994-07-02 1996-07-17 Moto Meter Gmbh Elektronischer Spannungswandler
FR2899400A1 (fr) * 2006-03-31 2007-10-05 Valeo Electronique Sys Liaison Elevateur de tension pour dispositif de mesure.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3124698A (en) * 1964-03-10 Source
US3174096A (en) * 1961-06-23 1965-03-16 Ampex D. c. voltage regulating circuit
US3262045A (en) * 1962-07-19 1966-07-19 Basic Products Corp Regulated d.c. power supply
US3317820A (en) * 1964-03-27 1967-05-02 Richard A Nylander Voltage regulator employing variable duty cycle modulating of the unregulated voltage

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3124698A (en) * 1964-03-10 Source
US3174096A (en) * 1961-06-23 1965-03-16 Ampex D. c. voltage regulating circuit
US3262045A (en) * 1962-07-19 1966-07-19 Basic Products Corp Regulated d.c. power supply
US3317820A (en) * 1964-03-27 1967-05-02 Richard A Nylander Voltage regulator employing variable duty cycle modulating of the unregulated voltage

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3808467A (en) * 1971-12-14 1974-04-30 Nippon Denso Co Effective voltage stabilizer
US3754182A (en) * 1972-10-02 1973-08-21 Litton Business Systems Inc Switching voltage regulator with input low voltage and output voltage detectors
US3979610A (en) * 1975-01-27 1976-09-07 International Telephone And Telegraph Corporation Power regulator circuit
EP0334431A3 (en) * 1988-03-22 1990-01-31 Philips Patentverwaltung Gmbh Circuit arrangement for producing a consumer's pulse supply voltage from a dc voltage
US5027052A (en) * 1988-03-22 1991-06-25 U.S. Philips Corporation Circuit arrangement for generating a pulsatory supply voltage for a load from a direct voltage
EP0690552A3 (de) * 1994-07-02 1996-07-17 Moto Meter Gmbh Elektronischer Spannungswandler
FR2899400A1 (fr) * 2006-03-31 2007-10-05 Valeo Electronique Sys Liaison Elevateur de tension pour dispositif de mesure.

Also Published As

Publication number Publication date
JPS4931260B1 (enrdf_load_stackoverflow) 1974-08-20

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