JPS5566761A - Detecting method and its device for source voltage zero point - Google Patents
Detecting method and its device for source voltage zero pointInfo
- Publication number
- JPS5566761A JPS5566761A JP7447178A JP7447178A JPS5566761A JP S5566761 A JPS5566761 A JP S5566761A JP 7447178 A JP7447178 A JP 7447178A JP 7447178 A JP7447178 A JP 7447178A JP S5566761 A JPS5566761 A JP S5566761A
- Authority
- JP
- Japan
- Prior art keywords
- pulse
- source voltage
- point
- zero
- shot
- 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 make detection on zero-point easy and accurate by producing one shot pulse of having definite width from the point at where source voltage becomes nearly zero volt and by making section at where output power for this one shot pulse is obtained, as a kind of blind zone for noise.
CONSTITUTION: First, find a point at where source voltage is nearly zero by zero- point-detecting-circuit III, consisted of comparator 7. At next step, by this detected output power, trigger one shot circuit section IV which is consisted of one-shot IC 8 and outer-fitted condenser 9 and resistance 10, and form positive pulse (E) which has longer width than width of this trigger pulse (C) and shorter width than half- cycle of source voltage. Thirdly, differentiate this positive pulse (E) by differential circuit V which is composed of condenser 11, resistance 12, 13 and buffer IC 14 and form differential pulse at rising-end-part of positive pulse (E) and thus get zero- point detecting pulse (F) of source voltage.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7447178A JPS5566761A (en) | 1978-06-19 | 1978-06-19 | Detecting method and its device for source voltage zero point |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7447178A JPS5566761A (en) | 1978-06-19 | 1978-06-19 | Detecting method and its device for source voltage zero point |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5566761A true JPS5566761A (en) | 1980-05-20 |
Family
ID=13548192
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7447178A Pending JPS5566761A (en) | 1978-06-19 | 1978-06-19 | Detecting method and its device for source voltage zero point |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5566761A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100684571B1 (en) | 2004-03-15 | 2007-02-22 | 공병성 | Power supply control circuit |
| CN101871965A (en) * | 2010-06-11 | 2010-10-27 | 威胜集团有限公司 | Method for detecting zero crossing time, frequency and phase difference of power sinusoidal signals |
-
1978
- 1978-06-19 JP JP7447178A patent/JPS5566761A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100684571B1 (en) | 2004-03-15 | 2007-02-22 | 공병성 | Power supply control circuit |
| CN101871965A (en) * | 2010-06-11 | 2010-10-27 | 威胜集团有限公司 | Method for detecting zero crossing time, frequency and phase difference of power sinusoidal signals |
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