JPS6244634U - - Google Patents
Info
- Publication number
- JPS6244634U JPS6244634U JP13697985U JP13697985U JPS6244634U JP S6244634 U JPS6244634 U JP S6244634U JP 13697985 U JP13697985 U JP 13697985U JP 13697985 U JP13697985 U JP 13697985U JP S6244634 U JPS6244634 U JP S6244634U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- signal
- comparator
- output
- calculation 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
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims 5
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Emergency Protection Circuit Devices (AREA)
Description
第１図は本考案の一実施例を示す電気的構成の
ブロツク図、第２図は同実施例を一部変形した例
を示すブロツク図、第３図は従来例を示すブロツ
ク図である。
図中、１１ａ，１１ｂ，１１ｃは負荷通電路、
１２ａ，１２ｂ，１２ｃは変流器、１３は整流回
路、１４は抵抗、１５はＡ―Ｄ変換回路、１６は
補助演算回路、１７はホールド回路、１８は信号
処理回路、１９は比較回路、２０は演算回路、２
１はマイクロコンピユータを示す。
FIG. 1 is a block diagram of an electrical configuration showing one embodiment of the present invention, FIG. 2 is a block diagram showing a partially modified example of the same embodiment, and FIG. 3 is a block diagram showing a conventional example. In the figure, 11a, 11b, and 11c are load conduction paths,
12a, 12b, 12c are current transformers, 13 is a rectifier circuit, 14 is a resistor, 15 is an A-D conversion circuit, 16 is an auxiliary calculation circuit, 17 is a hold circuit, 18 is a signal processing circuit, 19 is a comparison circuit, 20 is an arithmetic circuit, 2
1 indicates a microcomputer.
Claims (1)
これら各変流器の二次側出力を三相全波整流する
整流回路と、この整流回路の出力電流を電圧に変
換する抵抗と、この抵抗からの出力電圧をデジタ
ル化した検出信号を出力するＡ―Ｄ変換回路と、
前記検出信号に所定の定数を乗算して演算信号を
得ると共にその演算信号を順次一定時間ずつ遅延
させて出力する信号処理回路と、この信号処理回
路からの演算信号及び前記Ａ―Ｄ変換回路からの
検出信号を比較する比較回路と、この比較回路の
比較結果に応じて夫々カウント速度が異なるカウ
ントアツプ動作及びカウントダウン動作の何れか
を選択的に実行するように設けられそのカウント
値が所定の基準値に達したときに欠相検出信号を
出力する演算回路とを設けたことを特徴とする欠
相検出回路。 A current transformer installed in each of the three-phase load current paths,
A rectifier circuit that performs three-phase full-wave rectification of the secondary output of each of these current transformers, a resistor that converts the output current of this rectifier circuit into voltage, and a detection signal that digitizes the output voltage from this resistor is output. A-D conversion circuit,
a signal processing circuit that multiplies the detection signal by a predetermined constant to obtain a calculation signal and outputs the calculation signal by sequentially delaying the calculation signal by a certain period of time; and a calculation signal from the signal processing circuit and the calculation signal from the AD conversion circuit. A comparator circuit for comparing the detection signals of the comparator, and a comparator circuit configured to selectively perform either a count-up operation or a count-down operation with different counting speeds depending on the comparison result of the comparator circuit, and the count value is set to a predetermined standard. 1. An open phase detection circuit, comprising: an arithmetic circuit that outputs an open phase detection signal when a certain value is reached.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13697985U JPS6244634U (en) | 1985-09-06 | 1985-09-06 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13697985U JPS6244634U (en) | 1985-09-06 | 1985-09-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6244634U true JPS6244634U (en) | 1987-03-18 |
Family
ID=31040599
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13697985U Pending JPS6244634U (en) | 1985-09-06 | 1985-09-06 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6244634U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04156222A (en) * | 1990-10-17 | 1992-05-28 | Daikin Ind Ltd | Inverter device |
-
1985
- 1985-09-06 JP JP13697985U patent/JPS6244634U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04156222A (en) * | 1990-10-17 | 1992-05-28 | Daikin Ind Ltd | Inverter device |
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