JPH0182695U - - Google Patents
Info
- Publication number
- JPH0182695U JPH0182695U JP1987178671U JP17867187U JPH0182695U JP H0182695 U JPH0182695 U JP H0182695U JP 1987178671 U JP1987178671 U JP 1987178671U JP 17867187 U JP17867187 U JP 17867187U JP H0182695 U JPH0182695 U JP H0182695U
- Authority
- JP
- Japan
- Prior art keywords
- time
- power semiconductor
- protection circuit
- conduction
- long
- 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.)
- Granted
Links
Landscapes
- Control Of Electric Motors In General (AREA)
Description
第１図は本考案の実施例を示す温度保護回路、
第２図Ａ〜Ｆは本考案の動作例を従来例と比較し
ながら説明するタイムチヤート、第３図は一般的
な電力用半導体ブリツジ回路を有する電動機駆動
装置の温度保護回路である。
１…電動機制御回路、２…電力用半導体ブリツ
ジ回路、３…電動機、４…電流検出装置、５…絶
対値回路、１０，１０Ａ…１時遅れ回路、１３…
矩形波発振器、１５…アナログスイツチ、２０…
比較回路、２２…コンパレータ。
FIG. 1 shows a temperature protection circuit showing an embodiment of the present invention.
2A to 2F are time charts for explaining an operation example of the present invention in comparison with a conventional example, and FIG. 3 is a temperature protection circuit for a motor drive device having a general power semiconductor bridge circuit. DESCRIPTION OF SYMBOLS 1... Motor control circuit, 2... Power semiconductor bridge circuit, 3... Electric motor, 4... Current detection device, 5... Absolute value circuit, 10, 10A... 1 time delay circuit, 13...
Square wave oscillator, 15...Analog switch, 20...
Comparison circuit, 22... comparator.
Claims (1)
負荷状態を検出する温度保護回路において、電動
機に流れる電流を検出し、その検出信号を（導通
時間）／（導通時間＋非導通時間）＝１／ｎに断
続的処理を行なうと共に、短時間時定数τの１次
遅れ回路に入力することにより、長時間時定数ｎ
×τとして前記電力用半導体の温度上昇曲線と近
似させ、前記長時間時定数ｎ×τを基準電圧と比
較して前記電力用半導体を保護するようにしたこ
とを特徴とする電動機駆動装置における温度保護
回路。 In a temperature protection circuit that detects an overload state of a power semiconductor used in a motor drive device, the current flowing through the motor is detected and the detection signal is expressed as (conduction time) / (conduction time + non-conduction time) = 1 / By performing intermittent processing on n and inputting it to the first-order lag circuit with short-time time constant τ, the long-time time constant n
×τ is approximated to the temperature rise curve of the power semiconductor, and the long-time time constant n×τ is compared with a reference voltage to protect the power semiconductor. protection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987178671U JPH069594Y2 (en) | 1987-11-24 | 1987-11-24 | Temperature protection circuit in motor drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987178671U JPH069594Y2 (en) | 1987-11-24 | 1987-11-24 | Temperature protection circuit in motor drive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0182695U true JPH0182695U (en) | 1989-06-01 |
| JPH069594Y2 JPH069594Y2 (en) | 1994-03-09 |
Family
ID=31470279
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987178671U Expired - Lifetime JPH069594Y2 (en) | 1987-11-24 | 1987-11-24 | Temperature protection circuit in motor drive |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH069594Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6043090A (en) * | 1983-08-18 | 1985-03-07 | Fanuc Ltd | Overload protecting circuit of motor |
-
1987
- 1987-11-24 JP JP1987178671U patent/JPH069594Y2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6043090A (en) * | 1983-08-18 | 1985-03-07 | Fanuc Ltd | Overload protecting circuit of motor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH069594Y2 (en) | 1994-03-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH0182695U (en) | ||
| JPS6437135U (en) | ||
| JPH02125529U (en) | ||
| JPS633631U (en) | ||
| JPS6219088U (en) | ||
| JPS6376488U (en) | ||
| JPS633630U (en) | ||
| JPH0275997U (en) | ||
| JPS60183835U (en) | Illuminance measurement circuit | |
| JPS6450630U (en) | ||
| JPS61160502U (en) | ||
| JPS6149596U (en) | ||
| JPS60618U (en) | Control device | |
| JPS6249732U (en) | ||
| JPS6221732U (en) | ||
| JPS63172235U (en) | ||
| JPS6416140U (en) | ||
| JPS6194908U (en) | ||
| JPS638666U (en) | ||
| JPH0324068U (en) | ||
| JPS6448641U (en) | ||
| JPS63179797U (en) | ||
| JPS63159377U (en) | ||
| JPS6168686U (en) | ||
| JPS6397927U (en) |