JPS57120129A - Constant voltage device - Google Patents

Constant voltage device

Info

Publication number
JPS57120129A
JPS57120129A JP476181A JP476181A JPS57120129A JP S57120129 A JPS57120129 A JP S57120129A JP 476181 A JP476181 A JP 476181A JP 476181 A JP476181 A JP 476181A JP S57120129 A JPS57120129 A JP S57120129A
Authority
JP
Japan
Prior art keywords
voltage
circuit
zero cross
load
dropped
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.)
Pending
Application number
JP476181A
Other languages
Japanese (ja)
Inventor
Satoshi Mori
Hideyasu Endo
Tadahiro Eda
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP476181A priority Critical patent/JPS57120129A/en
Publication of JPS57120129A publication Critical patent/JPS57120129A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • G05F1/45—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 being controlled rectifiers in series with the load
    • G05F1/455—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 being controlled rectifiers in series with the load with phase control

Abstract

PURPOSE:To detect the accurate effective value of load voltage, by using both the mean value and the peak value. CONSTITUTION:The load voltage V1 is dropped by a transformer T1 and receives a full wave rectification 3 to be turned into the DC voltage V2 in accordance to the own voltage V1. The voltage V2 is applied to both a peak value circuit and a mean value circuit of a load voltage detecting circuit 4 to be turned into the DC voltage V3. The voltage V3 and the reference voltage Vref2 are supplied to a differential amplifier 5, and the error voltage V4 is obtained from the amplifier 5. On the other hand, the AC voltage of an AC power source 2 is dropped by a power supply transformer T2 and then receives a full wave rectification 7 to obtain the voltage V5. A zero cross detecting circuit 8 detects the zero cross point of the voltage V5 to produce a zero cross pulse V6. Then a sawtooth wave generating circuit 9 produces the voltage V7 to apply it to a phase shifting circuit 6 synchronously with the pulse V6. This sawtooth wave voltage V7 is compared with the voltage V4 through the circuit 6 to obtain a signal V8.
JP476181A 1981-01-16 1981-01-16 Constant voltage device Pending JPS57120129A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP476181A JPS57120129A (en) 1981-01-16 1981-01-16 Constant voltage device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP476181A JPS57120129A (en) 1981-01-16 1981-01-16 Constant voltage device

Publications (1)

Publication Number Publication Date
JPS57120129A true JPS57120129A (en) 1982-07-27

Family

ID=11592864

Family Applications (1)

Application Number Title Priority Date Filing Date
JP476181A Pending JPS57120129A (en) 1981-01-16 1981-01-16 Constant voltage device

Country Status (1)

Country Link
JP (1) JPS57120129A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS605795A (en) * 1983-06-20 1985-01-12 Matsushita Electric Ind Co Ltd Power controller of electric cleaner
JPS6263320A (en) * 1985-09-13 1987-03-20 Konishiroku Photo Ind Co Ltd Load controller

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS605795A (en) * 1983-06-20 1985-01-12 Matsushita Electric Ind Co Ltd Power controller of electric cleaner
JPS6263320A (en) * 1985-09-13 1987-03-20 Konishiroku Photo Ind Co Ltd Load controller

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