JPH0171979U - - Google Patents
Info
- Publication number
- JPH0171979U JPH0171979U JP1987165507U JP16550787U JPH0171979U JP H0171979 U JPH0171979 U JP H0171979U JP 1987165507 U JP1987165507 U JP 1987165507U JP 16550787 U JP16550787 U JP 16550787U JP H0171979 U JPH0171979 U JP H0171979U
- Authority
- JP
- Japan
- Prior art keywords
- cooling fin
- temperature difference
- current
- command value
- power 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
- 238000001816 cooling Methods 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims 3
- 239000004065 semiconductor Substances 0.000 claims 3
- 238000010586 diagram Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
Landscapes
- Power Conversion In General (AREA)
Description
第１図は本考案の実施例を示す機能ブロツク図
、第２図は第１図に示す実施例回路を応用した例
を示した回路図、第３図は第２図に図示のマイク
ロコンピユータの動作手順をあらわしたフローチ
ヤート、第４図は本考案による保護動作をあらわ
したグラフであり、第５図は冷却フインとジヤン
クシヨン部温度の動作ダイヤグラムである。
１…電流指令値検出部、２…ジヤンクシヨン部
・冷却フイン間温度差演算部、３…冷却フイン・
周囲間温度差演算部、４…遅延演算部、５…周囲
温度設定部、６…ジヤンクシヨン部温度検出部、
１１…インバータ、１２…変流器、１３…誘導電
動機、１５…マイクロコンピユータ、１６…電流
調節回路、１７…ベース駆動回路、２１〜３１…
ステツプ。
Fig. 1 is a functional block diagram showing an embodiment of the present invention, Fig. 2 is a circuit diagram showing an example of applying the embodiment circuit shown in Fig. 1, and Fig. 3 is a circuit diagram of the microcomputer shown in Fig. 2. FIG. 4 is a flowchart showing the operating procedure; FIG. 4 is a graph showing the protection operation according to the present invention; FIG. 5 is an operating diagram of the cooling fin and junction temperature. 1... Current command value detection section, 2... Temperature difference calculation section between junction section and cooling fin, 3... Cooling fin...
Ambient temperature difference calculation unit, 4... Delay calculation unit, 5... Ambient temperature setting unit, 6... Junction part temperature detection unit,
DESCRIPTION OF SYMBOLS 11... Inverter, 12... Current transformer, 13... Induction motor, 15... Microcomputer, 16... Current adjustment circuit, 17... Base drive circuit, 21-31...
Step.
Claims (1)
導体スイツチ素子とで構成され、電流指令値と一
致した電流を通流させる電流調節手段を備えた電
力変換装置において、前記電流指令値から得られ
る損失、および前記半導体スイツチ素子の熱抵抗
とから、当該半導体スイツチ素子の接合部と前記
冷却フインとの間の温度差を求める手段と、前記
電流指令値から得られる前記令却フイン上の損失
、および当該冷却フインの熱抵抗と熱時定数とか
ら、この冷却フインと周囲との間の時間的に変化
する温度差を求める手段と、別途設定され、また
は検出される周囲温度に、前記半導体スイツチ素
子接合部・冷却フイン間温度差と、前記冷却フイ
ン・周囲間の時間的に変化する温度差とを加算す
る手段と、この加算結果が所定値以上のときに、
前記電力変換装置に流れる電流を減少させる保護
手段とを備えていることを特徴とする、電力変換
装置の保護装置。 In a power conversion device comprising a cooling fin and a semiconductor switch element attached to the cooling fin, and equipped with a current adjusting means for passing a current that matches a current command value, the loss obtained from the current command value; and a thermal resistance of the semiconductor switch element, a means for determining the temperature difference between the junction part of the semiconductor switch element and the cooling fin, a loss on the cooling fin obtained from the current command value, and the means for determining the temporally varying temperature difference between the cooling fin and the surroundings from the thermal resistance and thermal time constant of the cooling fin; means for adding the temperature difference between the cooling fin and the cooling fin and the temporally changing temperature difference between the cooling fin and the surroundings, and when the addition result is equal to or greater than a predetermined value,
A protection device for a power conversion device, comprising: protection means for reducing a current flowing through the power conversion device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987165507U JPH0171979U (en) | 1987-10-29 | 1987-10-29 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987165507U JPH0171979U (en) | 1987-10-29 | 1987-10-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0171979U true JPH0171979U (en) | 1989-05-15 |
Family
ID=31452055
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987165507U Pending JPH0171979U (en) | 1987-10-29 | 1987-10-29 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0171979U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010268614A (en) * | 2009-05-15 | 2010-11-25 | Mitsubishi Electric Corp | Overheat protection device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5214137A (en) * | 1975-07-12 | 1977-02-02 | Bosch Gmbh Robert | Ignition device for internal combustion engine |
-
1987
- 1987-10-29 JP JP1987165507U patent/JPH0171979U/ja active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5214137A (en) * | 1975-07-12 | 1977-02-02 | Bosch Gmbh Robert | Ignition device for internal combustion engine |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010268614A (en) * | 2009-05-15 | 2010-11-25 | Mitsubishi Electric Corp | Overheat protection device |
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