JPH0330731U - - Google Patents
Info
- Publication number
- JPH0330731U JPH0330731U JP8832389U JP8832389U JPH0330731U JP H0330731 U JPH0330731 U JP H0330731U JP 8832389 U JP8832389 U JP 8832389U JP 8832389 U JP8832389 U JP 8832389U JP H0330731 U JPH0330731 U JP H0330731U
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- output current
- conversion unit
- frequency data
- forward conversion
- 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 8
- 238000001514 detection method Methods 0.000 claims description 6
- 239000003990 capacitor Substances 0.000 claims description 2
- 238000009499 grossing Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 3
- 230000006698 induction Effects 0.000 description 1
Landscapes
- Protection Of Static Devices (AREA)
- Rectifiers (AREA)
Description
第１図はこの考案の一実施例によるインバータ
装置の保護回路の回路構成図、第２図はこの考案
の原理を示した図、第３図は従来のインバータ装
置の回路の回路構成図である。
図において、１は順変換部、２は平滑コンデン
サ、３は逆変換部、４は誘導電動機、５はＰＷＭ
信号作成回路、６は逆変換部駆動回路、７は電流
検出器、８は電流検出回路、９は周波数検出回路
、１０は電源周波数設定回路、１１は周波数比較
回路、１２はＰＷＭ信号遮断回路、１３は警告回
路である。なお、図中、同一符号は同一、または
相当部分を示す。
Fig. 1 is a circuit diagram of a protection circuit of an inverter device according to an embodiment of this invention, Fig. 2 is a diagram showing the principle of this invention, and Fig. 3 is a circuit diagram of a conventional inverter device circuit. . In the figure, 1 is a forward conversion section, 2 is a smoothing capacitor, 3 is an inverse conversion section, 4 is an induction motor, and 5 is a PWM
Signal creation circuit, 6 is an inverse converter drive circuit, 7 is a current detector, 8 is a current detection circuit, 9 is a frequency detection circuit, 10 is a power supply frequency setting circuit, 11 is a frequency comparison circuit, 12 is a PWM signal cutoff circuit, 13 is a warning circuit. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.
Claims (1)
力に変換するインバータ装置において、順変換部
と平滑コンデンサの間に挿入され、順変換部出力
電流波形を検出する電流検出部と、電流検出器か
らの順変換部出力電流波形を電圧信号に変換する
電流検出回路と、この電圧信号の周波数を検出し
、順変換部出力電流周波数データとして出力する
周波数検出回路と、あらかじめインバータ装置の
入力電源の周波数を設定し、入力電源周波数デー
タを出力する電源周波数設定回路と、前記の順変
換部出力電流周波数データと入力電源周波数デー
タを比較し、順変換部出力電流周波数データが入
力電源周波数データの２倍より大きく６倍より小
さい値の内のある決められた値よりも小さいとき
には、順変換部の入力三相電源の内の一相分が誤
つて接続されていないことを判別する周波数比較
回路を備えたことを特徴とするインバータ装置の
保護回路。 In an inverter device that converts three-phase AC power into variable frequency, variable voltage AC power, there is a current detection unit that is inserted between the forward conversion unit and the smoothing capacitor, and that detects the output current waveform of the forward conversion unit, and a current detector that detects the output current waveform of the forward conversion unit. A current detection circuit that converts the output current waveform of the forward conversion unit into a voltage signal, a frequency detection circuit that detects the frequency of this voltage signal and outputs it as forward conversion unit output current frequency data, and a frequency detection circuit that detects the frequency of the voltage signal and outputs it as the output current frequency data of the forward conversion unit. and compares the forward converter output current frequency data and input power frequency data with the power frequency setting circuit that outputs the input power frequency data, and determines that the forward converter output current frequency data is twice the input power frequency data. A frequency comparison circuit is provided to determine that one phase of the input three-phase power supply of the forward converter is not connected by mistake when the value is smaller than a certain value larger than six times smaller. A protection circuit for an inverter device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8832389U JPH0330731U (en) | 1989-07-27 | 1989-07-27 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8832389U JPH0330731U (en) | 1989-07-27 | 1989-07-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0330731U true JPH0330731U (en) | 1991-03-26 |
Family
ID=31637944
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8832389U Pending JPH0330731U (en) | 1989-07-27 | 1989-07-27 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0330731U (en) |
-
1989
- 1989-07-27 JP JP8832389U patent/JPH0330731U/ja active Pending
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