JPH02107225U - - Google Patents
Info
- Publication number
- JPH02107225U JPH02107225U JP1436389U JP1436389U JPH02107225U JP H02107225 U JPH02107225 U JP H02107225U JP 1436389 U JP1436389 U JP 1436389U JP 1436389 U JP1436389 U JP 1436389U JP H02107225 U JPH02107225 U JP H02107225U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- reference voltage
- current
- comparator
- 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
- 238000001514 detection method Methods 0.000 claims description 12
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 2
- 230000005856 abnormality Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
- 238000013021 overheating Methods 0.000 description 1
- 238000003079 width control Methods 0.000 description 1
Description
第１図ないし第４図は本考案の一実施例を示す
ものであつて、第１図は負荷へ電力供給する回路
に設けられた電気機器の保護回路を示す回路図、
第２図は過電流保護回路中における各部の波形を
示す図、第３図はサーミスタの両端の電圧の時間
変化を示した図、第４図は過熱検出回路中におけ
る各部の波形を示す図、第５図は本考案の他の実
施例を示すものであつて、本考案の保護回路を備
えたパルス幅制御インバータ装置による３相モー
タ駆動装置を示す回路図である。
１はパワートランジスタ、２はフオトカプラ、
３は基準電源（基準電圧発生手段）、４は過電流
検出用のコンパレータ、６はタイマ回路（遮断信
号発生回路）、７は負荷、９はサーミスタ（温度
検出部）、１２は過熱検出用のコンパレータ、１
５は過電流検出回路、１６は過熱検出回路、１７
，１８は基準電源（基準電圧発生手段）、３０は
保護回路、３１は制御トランジスタ（スイツチン
グ手段）、３６は３相モータ、３８は電流検出抵
抗（電流検出部）、４０はモータ駆動回路、５０
はパルス幅制御インバータ装置である。
1 to 4 show an embodiment of the present invention, and FIG. 1 is a circuit diagram showing a protection circuit for an electrical device provided in a circuit that supplies power to a load;
Fig. 2 is a diagram showing the waveforms of each part in the overcurrent protection circuit, Fig. 3 is a diagram showing the time change of the voltage across the thermistor, and Fig. 4 is a diagram showing the waveforms of each part in the overheating detection circuit. FIG. 5 shows another embodiment of the present invention, and is a circuit diagram showing a three-phase motor drive device using a pulse width control inverter device equipped with the protection circuit of the present invention. 1 is a power transistor, 2 is a photocoupler,
3 is a reference power supply (reference voltage generation means), 4 is a comparator for overcurrent detection, 6 is a timer circuit (cutoff signal generation circuit), 7 is a load, 9 is a thermistor (temperature detection section), and 12 is for overheat detection. Comparator, 1
5 is an overcurrent detection circuit, 16 is an overheat detection circuit, 17
, 18 is a reference power supply (reference voltage generation means), 30 is a protection circuit, 31 is a control transistor (switching means), 36 is a three-phase motor, 38 is a current detection resistor (current detection section), 40 is a motor drive circuit, 50
is a pulse width controlled inverter device.
Claims (1)
に相当する電圧に変換する電流検出部と、 電流検出部にて検出される電圧と基準電圧発生
手段の基準電圧との大小比較を行う過電流検出用
のコンパレータと、 電気機器の被保護回路の温度をこの温度に相当
する電圧に変換する温度検出部と、 温度検出部にて検出される電圧と基準電圧発生
手段による基準電圧との大小比較を行う過熱検出
用のコンパレータと、 上記の被保護回路を制御する信号回路中に設け
られ、遮断信号発生回路の出力信号に基づいて、
信号回路を開閉するスイツチング手段と、 上記の両コンパレータの出力信号に基づいて、
異常時に、所定時間にわたり上記のスイツチング
手段へ、信号回路を開にさせて被保護回路を開に
させるための遮断信号を出力する遮断信号発生回
路とを備えていることを特徴とする電気機器の保
護回路。[Claim for Utility Model Registration] A current detection unit that converts the current flowing through a protected circuit of an electrical device into a voltage corresponding to this current, the voltage detected by the current detection unit, and the reference voltage of the reference voltage generation means. a comparator for overcurrent detection that compares the magnitude of A comparator for overheat detection performs a magnitude comparison with a reference voltage by
Based on the switching means for opening and closing the signal circuit and the output signals of both the above comparators,
An electrical device comprising a cutoff signal generation circuit that outputs a cutoff signal to the switching means for a predetermined period of time to open the signal circuit and open the protected circuit in the event of an abnormality. protection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1436389U JPH02107225U (en) | 1989-02-09 | 1989-02-09 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1436389U JPH02107225U (en) | 1989-02-09 | 1989-02-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02107225U true JPH02107225U (en) | 1990-08-27 |
Family
ID=31225496
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1436389U Pending JPH02107225U (en) | 1989-02-09 | 1989-02-09 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02107225U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5326188U (en) * | 1976-08-11 | 1978-03-06 | ||
| JPS5836121A (en) * | 1981-08-25 | 1983-03-03 | 三菱電機株式会社 | Circuit breaker |
-
1989
- 1989-02-09 JP JP1436389U patent/JPH02107225U/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5326188U (en) * | 1976-08-11 | 1978-03-06 | ||
| JPS5836121A (en) * | 1981-08-25 | 1983-03-03 | 三菱電機株式会社 | Circuit breaker |
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