JPH02147965A - Apparatus for detecting load state of inverter - Google Patents
Apparatus for detecting load state of inverterInfo
- Publication number
- JPH02147965A JPH02147965A JP63300695A JP30069588A JPH02147965A JP H02147965 A JPH02147965 A JP H02147965A JP 63300695 A JP63300695 A JP 63300695A JP 30069588 A JP30069588 A JP 30069588A JP H02147965 A JPH02147965 A JP H02147965A
- Authority
- JP
- Japan
- Prior art keywords
- inverter
- loss
- output
- steady
- carrier frequency
- 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 abstract description 8
- 230000001052 transient effect Effects 0.000 claims description 12
- 239000004065 semiconductor Substances 0.000 claims description 2
- 239000002699 waste material Substances 0.000 abstract description 2
- 230000007704 transition Effects 0.000 abstract 3
- 238000000034 method Methods 0.000 abstract 1
- 238000001816 cooling Methods 0.000 description 5
- 230000006698 induction Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 1
Landscapes
- Testing Electric Properties And Detecting Electric Faults (AREA)
- Inverter Devices (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、誘導電動機等を駆動するインバータの負荷
状態検出装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a load state detection device for an inverter that drives an induction motor or the like.
従来、この種の装置として、インバータ出力電流から単
に総合発生損失（定常損失＋過渡損失）を演算し、その
結果からインバータ主回路素子の負荷状態を検出するも
のが知られている。Conventionally, as this type of device, one is known that simply calculates the total generated loss (steady loss + transient loss) from the inverter output current and detects the load state of the inverter main circuit elements from the result.
しかしながら、このような装置ではキャリア周波数が変
わることによる損失は考慮しておらず、インバータ発生
損失を常に最大とするキャリア周波数で使用していると
仮定して求めているため、インバータ出力容量を最大限
に利用できないと云う問題がある。また、キャリア周波
数を現在使用している値（標準値）よりも高く設定した
いときなどは、それに応じて発生損失データ値を変更し
なければならないと云う問題もある。However, such devices do not take into account losses due to changes in carrier frequency, and are calculated based on the assumption that the inverter is used at the carrier frequency that always maximizes the loss generated. The problem is that it is not available for limited use. Another problem is that when it is desired to set the carrier frequency higher than the currently used value (standard value), the generated loss data value must be changed accordingly.
少なくとも半導体素子を主回路素子としてもちパルス幅
変調制御されるインバータに、その出力電流を検出する
検出手段と、該検出値からインバータの定常損失を検索
する定常損失テーブルと、インバータのキャリア周波数
からインバータの過渡損失を検索する過渡損失テーブル
と、これらの損失値からインバータ主回路素子の温度を
演算する演算手段と、を設け、該演算温度値をその設定
値と比較してインバータの負荷状態を検出する。An inverter that has at least a semiconductor element as a main circuit element and is controlled by pulse width modulation includes a detection means for detecting its output current, a steady loss table for searching the steady loss of the inverter from the detected value, and a steady loss table for searching the steady loss of the inverter from the carrier frequency of the inverter. A transient loss table for searching the transient loss of do.
インバータの発生損失をインバータ出力電流から求めら
れる定常損失（スイッチング素子の定常オン損失）と、
キャリア周波数から求められる過渡）４失（スイッチン
グ損失）とに分けて求めることにより、キャリア周波数
が変わる場合にも対処できるようにし、インバータ出力
容量を無駄なく利用できるようにする。The loss generated by the inverter is calculated from the inverter output current as the steady loss (steady ON loss of the switching element),
By calculating the loss (transient) and loss (switching loss) obtained from the carrier frequency separately, it is possible to deal with the case where the carrier frequency changes, and the inverter output capacity can be used without wasting it.
図はこの発明の実施例を示すブロック図である。 The figure is a block diagram showing an embodiment of the invention.
同図において、１はインバータ、２は変流器、３は負荷
としての誘導電動機（ＩＭ）、４は全波整流器、５は定
常損失テーブル、６は過渡損失テーブル、７は切替スイ
ッチ、８，１４は比較器、９゜９Ａは加算器、１０．Ｉ
ＯＡは乗算器、１１は主回路素子のジャンクションと冷
却フィン間の熱抵抗値設定器、ＩＩＡは冷却フィンと外
部空気（エア）間の熱抵抗値設定器、１２は冷却フィン
熱時定数演算器、１３は過負荷検出レベル設定器を示す
。In the figure, 1 is an inverter, 2 is a current transformer, 3 is an induction motor (IM) as a load, 4 is a full-wave rectifier, 5 is a steady loss table, 6 is a transient loss table, 7 is a changeover switch, 8, 14 is a comparator, 9°9A is an adder, 10. I
OA is a multiplier, 11 is a thermal resistance value setting device between the main circuit element junction and the cooling fin, IIA is a thermal resistance value setting device between the cooling fin and external air, and 12 is a cooling fin thermal time constant calculator. , 13 indicates an overload detection level setter.
変流器２はインバータ１の出力電流を検出する。Current transformer 2 detects the output current of inverter 1.
その出力は全波整流器４にて全波整流され、定常損失テ
ーブル５および比較器８にそれぞれ入力される。定常損
失テーブル５はインバータ出力電流から定常損失を出力
し、比較器８は切替スイッチ７を駆動する。一方、イン
バータ１からのキャリア周波数ｆｃは過渡を置火テーブ
ル６に与えられ、該テーブル６からキャリア周波数ｆ、
に応じた過渡損失が出力される。その出力は切替スイッ
チ７を介して加算器９に与えられ、こ＼で定常損失テー
ブル５からの出力と加算されて総合損失が求められる。The output is full-wave rectified by a full-wave rectifier 4 and input to a steady loss table 5 and a comparator 8, respectively. The steady loss table 5 outputs the steady loss from the inverter output current, and the comparator 8 drives the changeover switch 7. On the other hand, the carrier frequency fc from the inverter 1 is given a transient to the heating table 6, and the carrier frequency f,
The transient loss corresponding to the output is output. The output is given to an adder 9 via a changeover switch 7, where it is added to the output from the steady loss table 5 to obtain a total loss.
このとき、比較器８はインバータ出力電流が流れている
か否かを検出し、流れていないときは切替スイッチ７に
より過渡損失を零とする。At this time, the comparator 8 detects whether or not the inverter output current is flowing, and when it is not flowing, the changeover switch 7 makes the transient loss zero.
次に、乗算器１０では加算器９を介して得られる総合損
失に熱抵抗値ＲＪｒを乗算して、ジャンクション−フィ
ン間の温度を求める。同様に、乗算器１０Ａにより総合
損失に熱抵抗値Ｒｆｌを乗算し、その出力を冷却フィン
熱時定数演算器１２に入力することにより、フィン−エ
ア間の温度を求める。Next, the multiplier 10 multiplies the total loss obtained via the adder 9 by the thermal resistance value RJr to obtain the temperature between the junction and the fin. Similarly, the total loss is multiplied by the thermal resistance value Rfl by the multiplier 10A, and the output thereof is input to the cooling fin thermal time constant calculator 12 to obtain the temperature between the fins and the air.
そして、加算器９Ａにてジャンクション−フィン間の温
度、フィン−エア間の温度および周囲温度（Ｔ、）を加
算して素子ジャンクション温度を求める。この温度を比
較器１４にて過負荷検出レベル１３と比較し、例えば過
負荷なら１°゛、それ以外ならば“０”の如く、インバ
ータの負荷状態を示す信号Ｓを出力する。Then, the adder 9A adds the temperature between the junction and the fin, the temperature between the fin and the air, and the ambient temperature (T) to obtain the element junction temperature. This temperature is compared with an overload detection level 13 by a comparator 14, and a signal S indicating the load state of the inverter is output, for example, 1° if there is an overload, and "0" otherwise.
この発明によれば、キャリア周波数を変更しても常に適
切な発生１員失が得られるので、インバータ出力容量を
無駄なく有効に利用することができる。さらに、キャリ
ア周波数を標準値よりも高く設定しても、過渡損失が自
動的に増加することになるので、より確実な過負荷保護
が可能となる。According to this invention, even if the carrier frequency is changed, an appropriate generation loss can always be obtained, so that the inverter output capacity can be used effectively without waste. Furthermore, even if the carrier frequency is set higher than the standard value, the transient loss will automatically increase, making it possible to provide more reliable overload protection.
図はこの発明の実施例を示すブロック図である。
符号説明
１・・・インバータ、２・・・変流器、３・・・誘導電
動機（ＩＭ）、４・・・全波整流器、５・・・定常損失
テーブル、６・・・過渡損失テーブル、７・・・切替ス
イッチ、８．１４・・・比較器、９，９Ａ・・・加算器
、１０．ＩＯＡ・・・乗算器、１１．１１Ａ・・・熱抵
抗値設定器、１２・・・冷却フィン熱時定数演算器、１
３・・・過負荷検出レベル設定器。
代理人 弁理士 並 木 昭 夫The figure is a block diagram showing an embodiment of the invention. Description of symbols 1...Inverter, 2...Current transformer, 3...Induction motor (IM), 4...Full wave rectifier, 5...Steady loss table, 6...Transient loss table, 7... Selector switch, 8.14... Comparator, 9,9A... Adder, 10. IOA... Multiplier, 11.11A... Thermal resistance value setter, 12... Cooling fin thermal time constant calculator, 1
3...Overload detection level setter. Agent Patent Attorney Akio Namiki
Claims (1)
変調制御されるインバータにおいて、その出力電流を検
出する検出手段と、 該検出値からインバータの定常損失を検索する定常損失
テーブルと、 インバータのキャリア周波数からインバータの過渡損失
を検索する過渡損失テーブルと、 これらの損失値からインバータ主回路素子の温度を演算
する演算手段と、 を設け、該演算温度値をその設定値と比較して負荷状態
を検出することを特徴とするインバータの負荷状態検出
装置。[Scope of Claims] In an inverter that has at least a semiconductor element as a main circuit element and is controlled by pulse width modulation, a detection means for detecting the output current thereof; a steady loss table for searching the steady loss of the inverter from the detected value; A transient loss table for searching the inverter's transient loss from the inverter's carrier frequency, and a calculation means for calculating the temperature of the inverter main circuit elements from these loss values, are provided, and the calculated temperature value is compared with the set value. An inverter load state detection device characterized by detecting a load state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63300695A JPH02147965A (en) | 1988-11-30 | 1988-11-30 | Apparatus for detecting load state of inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63300695A JPH02147965A (en) | 1988-11-30 | 1988-11-30 | Apparatus for detecting load state of inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02147965A true JPH02147965A (en) | 1990-06-06 |
Family
ID=17887967
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63300695A Pending JPH02147965A (en) | 1988-11-30 | 1988-11-30 | Apparatus for detecting load state of inverter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02147965A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007215250A (en) * | 2006-02-07 | 2007-08-23 | Meidensha Corp | Overload protector for inverter device |
| JP2012039783A (en) * | 2010-08-09 | 2012-02-23 | Toshiba Schneider Inverter Corp | Inverter device |
-
1988
- 1988-11-30 JP JP63300695A patent/JPH02147965A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007215250A (en) * | 2006-02-07 | 2007-08-23 | Meidensha Corp | Overload protector for inverter device |
| JP2012039783A (en) * | 2010-08-09 | 2012-02-23 | Toshiba Schneider Inverter Corp | Inverter device |
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