JPH0279133U - - Google Patents
Info
- Publication number
- JPH0279133U JPH0279133U JP15713588U JP15713588U JPH0279133U JP H0279133 U JPH0279133 U JP H0279133U JP 15713588 U JP15713588 U JP 15713588U JP 15713588 U JP15713588 U JP 15713588U JP H0279133 U JPH0279133 U JP H0279133U
- Authority
- JP
- Japan
- Prior art keywords
- overcurrent
- transistor
- protection circuit
- cutoff signal
- overcurrent protection
- 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
- 238000010586 diagram Methods 0.000 description 5
- 238000003079 width control Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
Description
第１図および第２図は本考案の一実施例を示す
ものであつて、第１図はパルス幅制御インバータ
装置の全体の構成を示す回路図、第２図は過電流
保護回路の回路中における信号の状態を示すタイ
ムチヤートである。第３図および第４図は従来例
を示すもので、第３図は過電流保護回路を有する
モータ駆動制御装置の概略回路構成を示すブロツ
ク図、第４図は過電流保護回路の遮断信号発生器
および状態出力部の構成を示す回路図である。
１はモータ、２はパルス幅制御インバータ装置
、３はモータ駆動回路、４は過電流保護回路、１
３，１４，１５は電源、１６は一部電源制御用の
トランジスタ（第二のトランジスタ）、２１は過
電流検出部、２２はアンプ、２３は比較器、２５
は遮断信号発生器、２６は状態出力部、２６ａは
フオトカプラ、２６ｃは第一のトランジスタ、２
７は制御回路である。
1 and 2 show one embodiment of the present invention, in which FIG. 1 is a circuit diagram showing the overall configuration of a pulse width control inverter device, and FIG. 2 is a circuit diagram showing an overcurrent protection circuit. This is a time chart showing the signal status at . Figures 3 and 4 show conventional examples; Figure 3 is a block diagram showing a schematic circuit configuration of a motor drive control device having an overcurrent protection circuit; Figure 4 is a block diagram showing the generation of a cutoff signal for the overcurrent protection circuit. FIG. 2 is a circuit diagram showing the configuration of a device and a status output section. 1 is a motor, 2 is a pulse width control inverter device, 3 is a motor drive circuit, 4 is an overcurrent protection circuit, 1
3, 14, 15 are power supplies, 16 is a transistor for partially controlling the power supply (second transistor), 21 is an overcurrent detection section, 22 is an amplifier, 23 is a comparator, 25
2 is a cutoff signal generator, 26 is a status output section, 26a is a photocoupler, 26c is a first transistor, 2
7 is a control circuit.
Claims (1)
た信号と基準信号との電圧値の比較を行う比較器
と、この比較器の出力信号に基づいて、所定の時
間にわたり所定回路の電源供給を遮断させる遮断
信号発生器とを備え、 過電流検出時に上記所定回路の電源供給を遮断
させるとともに、第一のトランジスタをＯＦＦす
ることにより、第二のトランジスタのベース電流
を遮断して、この第二のトランジスタをＯＦＦ状
態として他の一部電源を遮断し、過電流を防止す
る過電流保護回路において、 上記第一のトランジスタのベースと、遮断信号
発生器の出力点との間に、遮断信号出力用フオト
カプラが挿入されていることを特徴とする過電流
保護回路。[Claims for Utility Model Registration] An overcurrent detector, a comparator that compares the voltage value of the signal detected by the overcurrent detector and a reference signal, and a and a cutoff signal generator that cuts off the power supply to the predetermined circuit for a period of In an overcurrent protection circuit that prevents overcurrent by cutting off current and turning off this second transistor and cutting off some other power supplies, the base of the first transistor and the output of the cutoff signal generator are connected. An overcurrent protection circuit characterized in that a photocoupler for outputting a cutoff signal is inserted between the point and the point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15713588U JPH0279133U (en) | 1988-11-30 | 1988-11-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15713588U JPH0279133U (en) | 1988-11-30 | 1988-11-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0279133U true JPH0279133U (en) | 1990-06-18 |
Family
ID=31436314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15713588U Pending JPH0279133U (en) | 1988-11-30 | 1988-11-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0279133U (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5932218A (en) * | 1983-07-21 | 1984-02-21 | Matsushita Electric Ind Co Ltd | Channel selection display device |
| JPS63637B2 (en) * | 1980-08-26 | 1988-01-07 | Toyoda Machine Works Ltd | |
| JPS6355747B2 (en) * | 1981-03-06 | 1988-11-04 | Amp Inc |
-
1988
- 1988-11-30 JP JP15713588U patent/JPH0279133U/ja active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63637B2 (en) * | 1980-08-26 | 1988-01-07 | Toyoda Machine Works Ltd | |
| JPS6355747B2 (en) * | 1981-03-06 | 1988-11-04 | Amp Inc | |
| JPS5932218A (en) * | 1983-07-21 | 1984-02-21 | Matsushita Electric Ind Co Ltd | Channel selection display device |