JPS5487276A - Watt meter - Google Patents

Watt meter

Info

Publication number
JPS5487276A
JPS5487276A JP15516377A JP15516377A JPS5487276A JP S5487276 A JPS5487276 A JP S5487276A JP 15516377 A JP15516377 A JP 15516377A JP 15516377 A JP15516377 A JP 15516377A JP S5487276 A JPS5487276 A JP S5487276A
Authority
JP
Japan
Prior art keywords
signals
circuit
pulse width
duty cycle
proportional
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
JP15516377A
Other languages
Japanese (ja)
Inventor
Ryoji Gamo
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP15516377A priority Critical patent/JPS5487276A/en
Publication of JPS5487276A publication Critical patent/JPS5487276A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To meter a watt stably without any influence from a load by using the logic of a comparator circuit and the duty cycle signals of a pulse width modulating circuit.
CONSTITUTION: In response to voltage signals eV applied, a pulse width modulatin circuit 11 performs the pulse width modulation thereby to generate duty cycle signals D having a pulse width. On the other hand,switches S1 and S2 are turned on and off so that the current signals, which are proportional to the consumed current appearing in the seconadry winding of a current transformer 15, are integrated by an integrating circuit 16. The resultant output is fed to a comparator circuit 17 so that the switches S1 and S2 are turned on and off by using the logic signals of the comparator circuit 17 and the duty cycle signals D of the pulse width modulation circuit 11. The time, for which the output voltage of the integrating circuit 16 reaches a preset level, is proportional to the product of the duty cycle D and the current signals i so that the frequency signals f proportional to the power can be obtained.
COPYRIGHT: (C)1979,JPO&Japio
JP15516377A 1977-12-23 1977-12-23 Watt meter Pending JPS5487276A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15516377A JPS5487276A (en) 1977-12-23 1977-12-23 Watt meter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15516377A JPS5487276A (en) 1977-12-23 1977-12-23 Watt meter

Publications (1)

Publication Number Publication Date
JPS5487276A true JPS5487276A (en) 1979-07-11

Family

ID=15599883

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15516377A Pending JPS5487276A (en) 1977-12-23 1977-12-23 Watt meter

Country Status (1)

Country Link
JP (1) JPS5487276A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5471669A (en) * 1977-10-21 1979-06-08 Siemens Ag Device for measuring ac power or wattage

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5471669A (en) * 1977-10-21 1979-06-08 Siemens Ag Device for measuring ac power or wattage

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