JPS5614956A - Power-factor detection circuit - Google Patents
Power-factor detection circuitInfo
- Publication number
- JPS5614956A JPS5614956A JP9123279A JP9123279A JPS5614956A JP S5614956 A JPS5614956 A JP S5614956A JP 9123279 A JP9123279 A JP 9123279A JP 9123279 A JP9123279 A JP 9123279A JP S5614956 A JPS5614956 A JP S5614956A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- circuit
- power
- polarity
- voltage signal
- 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
Links
Landscapes
- Measurement Of Current Or Voltage (AREA)
Abstract
PURPOSE: To accurately detect a power-factor, by appropriately inverting the polarity of the rectified wave of a sinusoidal voltage signal depending on a logical level signal, which is generated by the conversion of the voltage signal and a current signal, and by effecting synthesis.
CONSTITUTION: The positive portion of a sinusoidal voltage signal 1a is rectified by a rectifier circuit 1 to produce a signal 1b. Rectangular waves 2a are generated by a wave form conversion circuit 2. The wave form of a current signal 6a having a phase difference of ϕ from the voltage signal is changed at 6 to generate a signal 6b. In a synthesis circuit 3, the polarity of the signal 1b is inverted depending on a logical level signal for a time t0Wt1 and synthesis is effected to produce a signal 3a. The signal 1b is averaged by a smoothing circuit 4. The signal 3a is divided at 7 by the output 4a of the smoothing circuit. Polarity is selected by a selector circuit 8 depending on the polarity of the output 5a of a discrimination circuit 5 corresponding to the phase difference between the changed voltage signal 2a and the changed current signal 6b, thereby obtaining an output 8a corresponding to a power-factor of cosϕ. This results in accurately detecting the power-factor through a simple circuit construction.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9123279A JPS5614956A (en) | 1979-07-17 | 1979-07-17 | Power-factor detection circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9123279A JPS5614956A (en) | 1979-07-17 | 1979-07-17 | Power-factor detection circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5614956A true JPS5614956A (en) | 1981-02-13 |
Family
ID=14020667
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9123279A Pending JPS5614956A (en) | 1979-07-17 | 1979-07-17 | Power-factor detection circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5614956A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4764952A (en) * | 1987-03-18 | 1988-08-16 | Feliu Horace G | Telecommunications device for reading power meters |
JPH0464888A (en) * | 1990-07-04 | 1992-02-28 | Fuji Electric Co Ltd | Vacuum induction furnace |
JPH0490494A (en) * | 1990-08-01 | 1992-03-24 | Fuji Electric Co Ltd | Crucible induction furnace having low melting point metal countermeasure |
-
1979
- 1979-07-17 JP JP9123279A patent/JPS5614956A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4764952A (en) * | 1987-03-18 | 1988-08-16 | Feliu Horace G | Telecommunications device for reading power meters |
JPH0464888A (en) * | 1990-07-04 | 1992-02-28 | Fuji Electric Co Ltd | Vacuum induction furnace |
JPH0490494A (en) * | 1990-08-01 | 1992-03-24 | Fuji Electric Co Ltd | Crucible induction furnace having low melting point metal countermeasure |
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