JPS648837A - Ac no-break power unit - Google Patents
Ac no-break power unitInfo
- Publication number
- JPS648837A JPS648837A JP62163649A JP16364987A JPS648837A JP S648837 A JPS648837 A JP S648837A JP 62163649 A JP62163649 A JP 62163649A JP 16364987 A JP16364987 A JP 16364987A JP S648837 A JPS648837 A JP S648837A
- Authority
- JP
- Japan
- Prior art keywords
- current
- circuit
- voltage
- change
- output
- 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
- Stand-By Power Supply Arrangements (AREA)
Abstract
PURPOSE:To prevent cross current from being generated without a commutation circuit, by controlling thyristors with gate signal synchronized with current phase when there is a phase difference between voltage and current, and synchronized with voltage phase when there is no phase difference and when current is zero. CONSTITUTION:From a commercial power source 3, current is fed to a load 9 via SCR 6, 7. From the current detecting circuit 10 of a control circuit 1, according to the positive or negative of the direction of current detected by a current transformer 8, the output of levels H, L is directed to a change-over circuit 13. From a line voltage detecting circuit 11, according to the positive or negative of voltage detected from an inverter 2, the output of the H and L is directed to the change-over circuit 13. By the change-over circuit 13, the output of the current detecting circuit 10 is applied to the gates of SCR 4, 5 when current is flowing, and the output of the voltage detecting circuit 11 is applied to the gates when voltage and current are set in the same phase or when current is zero. By the commercial power source 3, line voltage is detected 12, and in case of the positive, the input of H to the change-over circuit 13 is provided, and in case of the negative, the input of L to the circuit 13 is provided. As a result, the SCR 4, 5 and 6, 7 are prevented from being turned conductive at the same time, and cross current is prevented from being generated at the time of the change-over of the power source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62163649A JPS648837A (en) | 1987-06-30 | 1987-06-30 | Ac no-break power unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62163649A JPS648837A (en) | 1987-06-30 | 1987-06-30 | Ac no-break power unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS648837A true JPS648837A (en) | 1989-01-12 |
Family
ID=15777953
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62163649A Pending JPS648837A (en) | 1987-06-30 | 1987-06-30 | Ac no-break power unit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS648837A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06276686A (en) * | 1993-03-22 | 1994-09-30 | Ngk Insulators Ltd | Changing-over apparatus for phase of high voltage 3-phase power distribution line |
| JPH07111742A (en) * | 1993-10-13 | 1995-04-25 | Nec Corp | Catv uninterruptible power source |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59201642A (en) * | 1983-04-28 | 1984-11-15 | 日本電気精器株式会社 | No instantaneous stop switching circuit of energizing line |
-
1987
- 1987-06-30 JP JP62163649A patent/JPS648837A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59201642A (en) * | 1983-04-28 | 1984-11-15 | 日本電気精器株式会社 | No instantaneous stop switching circuit of energizing line |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06276686A (en) * | 1993-03-22 | 1994-09-30 | Ngk Insulators Ltd | Changing-over apparatus for phase of high voltage 3-phase power distribution line |
| JPH07111742A (en) * | 1993-10-13 | 1995-04-25 | Nec Corp | Catv uninterruptible power source |
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