JPS62178174A - Control circuit for inverter - Google Patents
Control circuit for inverterInfo
- Publication number
- JPS62178174A JPS62178174A JP61016811A JP1681186A JPS62178174A JP S62178174 A JPS62178174 A JP S62178174A JP 61016811 A JP61016811 A JP 61016811A JP 1681186 A JP1681186 A JP 1681186A JP S62178174 A JPS62178174 A JP S62178174A
- Authority
- JP
- Japan
- Prior art keywords
- load factor
- gtr
- inverter
- load
- gtrs
- 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 8
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 230000007423 decrease Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 230000006698 induction Effects 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 1
- 244000145845 chattering Species 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Landscapes
- Inverter Devices (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は直−交変換器の各相を複数の素子を並列接続し
て構成したインバータの制御回路に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an inverter control circuit in which each phase of an orthogonal converter is constructed by connecting a plurality of elements in parallel.
従来のインバータ回路の一例を第２図に示す。 An example of a conventional inverter circuit is shown in FIG.
第２図において、交−直変換器１は交流電源に接続され
、コンデンサ２は交−直変換器１からの直流電源を平滑
し、直−交変換器３はコンデンサ２で平滑された直流を
交流に逆変換して誘導電動ｌ！＆９を駆動しており、直
−交変換器３はＧＴＲ（ジャイアン１−トランジスタ）
３ａ〜３ｆ、４ａ〜４ｆ。In FIG. 2, an AC-DC converter 1 is connected to an AC power source, a capacitor 2 smoothes the DC power from the AC-DC converter 1, and an AC-DC converter 3 smoothes the DC power supplied by the capacitor 2. Induction electric motor by converting it back to alternating current! &9, and the orthogonal converter 3 is a GTR (Gian 1-transistor)
3a-3f, 4a-4f.
５ａ〜５ｆ、 ６ａ〜６ｆ、 ７ａ〜７ｆ、 ８ａ〜８
ｆを各相ごとに並列接続して構成されている。5a-5f, 6a-6f, 7a-7f, 8a-8
f are connected in parallel for each phase.
ＧＴＲ３ａ〜３ｆ −８ａ〜８ｆはすべてベースドライ
ブ回路１４によって駆動されるので、ベースドライブ回
路１４は誘導電動機９の負荷率とは無関係にすべてのＧ
ＴＲ（合計３６個）に所定のベース電流を流し続けなけ
ればならない。Since all GTRs 3a to 3f -8a to 8f are driven by the base drive circuit 14, the base drive circuit 14 drives all GTRs regardless of the load factor of the induction motor 9.
A predetermined base current must continue to flow through the TRs (36 in total).
このためインバータの変換効率は、第３図に示すように
負荷率５０％のとき、負荷率１００％のときに比べて数
％程度低下する。Therefore, as shown in FIG. 3, the conversion efficiency of the inverter decreases by several percent when the load factor is 50% compared to when the load factor is 100%.
これはＧＴＲの駆動制御回路、スイッチング回路および
インバータの制御回路などに消費される電力が負荷率に
よって変化しないからであり、従って誘導電動＋！＆９
の負荷率が低い範囲では、従来のインバータでは変換効
率が低下するという問題がある。This is because the power consumed by the GTR drive control circuit, switching circuit, inverter control circuit, etc. does not change depending on the load factor, so the induction electric +! &9
In a range where the load factor is low, conventional inverters have a problem in that the conversion efficiency decreases.
本発明は並列接続したＧＴＲのうち負荷率に応じた必要
最小限のＧＴＲのみを駆動することによって変換効率を
向上するインバータの制御回路を提供することを目的と
している。An object of the present invention is to provide an inverter control circuit that improves conversion efficiency by driving only the minimum number of GTRs connected in parallel according to the load factor.
本発明、は、逆変換器の各相が複数の素子を並列接続し
て構成されたインバータの制御回路において、上記各素
子ごとに設けた駆動用選択スイッチと、インバータの出
力電流からインバータの負荷率を検出する負荷率検出回
路と、上記負荷率に応じて」−記選択スイッチを選択し
て並列接続された素子の中の所要数の素子のみを通電さ
せる選択スイッチ駆動回路を備え、これによって負荷率
の小さいときは駆動する並列素子の数を減らしてインバ
ータの効率向上をはかったものである。The present invention provides an inverter control circuit in which each phase of an inverter is configured by connecting a plurality of elements in parallel. a load factor detection circuit that detects the load factor; and a selection switch drive circuit that selects the selection switch and energizes only the required number of elements among the parallel-connected elements according to the load factor. When the load factor is small, the number of parallel elements to be driven is reduced to improve the efficiency of the inverter.
本発明の一実施例を第１図に示す。 An embodiment of the present invention is shown in FIG.
第１図は従来の第２図に対して、負荷電流に応じてＧＴ
Ｒ駆動数を増減するＧＴＲ選択スイッチ１３、選択スイ
ッチ１３を駆動する選択スイッチ駆動回路１２１選択ス
イッチ駆動回路１２に入力信号を与える負荷率検出回路
１１、および負荷率検出回路１１に負荷電流信号をあた
える変流器１０が追加されており、他は従来の第２図と
同じである。Fig. 1 shows the difference between the conventional Fig. 2 and the conventional Fig. 2.
A GTR selection switch 13 that increases or decreases the number of R drives, a selection switch drive circuit 121 that drives the selection switch 13, a load factor detection circuit 11 that provides an input signal to the selection switch drive circuit 12, and a load current signal that is applied to the load factor detection circuit 11. A current transformer 10 has been added, and the rest is the same as the conventional one in FIG.
上記負荷率検出回路１１および選択スイッチ駆動回路の
詳細をそれぞれ第５図および第６図に示す。Details of the load factor detection circuit 11 and selection switch drive circuit are shown in FIGS. 5 and 6, respectively.
誘導電動機９の負荷に変動が生ずるとインバータの出力
電流が変化し、これを変流器１０が検出して負荷率検出
回路１１の電流変換器１１ａに入力し。When a change occurs in the load of the induction motor 9, the output current of the inverter changes, which is detected by the current transformer 10 and inputted to the current converter 11a of the load factor detection circuit 11.
ＧＴＲ駆動数設定器１１ｂの入力信号に変換する。It is converted into an input signal for the GTR drive number setting unit 11b.
ＧＴＲ駆動数設定器１１ｂはＧ 、Ｔ Ｒの並列数と、
負荷変動の幅により任意にＧＴＲ駆動数の設定段数を切
換できる設定段数切換スイッチｌｌｃからの信号と、イ
ンバータが始動中の場合にＧＴＲを全数駆動させるため
の始動指令回路１５からの始動モード指令１５ａとを入
力してＧＴＲ駆動数選択信号信号Ｆを出力する。The GTR drive number setting device 11b determines the number of parallel G and TR,
A signal from a set stage number changeover switch llc that can arbitrarily change the set number of stages of the GTR drive number depending on the width of load fluctuation, and a starting mode command 15a from the starting command circuit 15 to drive all the GTRs when the inverter is starting. and outputs the GTR drive number selection signal F.
始動モードか通常制御かの切換は始動指令に応じて切換
スイッチ１５ｂを切換えることによって行われる。Switching between the starting mode and normal control is performed by switching the changeover switch 15b in response to a starting command.
選択スイッチ駆動回路１２は上記選択記号Ａ−Ｆを接続
できる端子と選択スイッチ駆動電源１２ａより構成され
、上記選択記号Ａ−Ｆに応じて選択スイッチ１３を制御
する。The selection switch drive circuit 12 is comprised of a terminal to which the selection symbols AF can be connected and a selection switch drive power supply 12a, and controls the selection switch 13 according to the selection symbols AF.
第４図は１アームあたり６個のＧＴＲを並列接続して構
成した三相インバータにおける負荷率と負荷電流および
ＧＴＲ駆動数の関係を示す特性の一例であり、この例で
は負荷電流Ｉは負荷率に比例して増減するものと仮定し
ている。Figure 4 shows an example of the characteristics showing the relationship between the load factor, load current, and number of GTR drives in a three-phase inverter configured by connecting six GTRs in parallel per arm. In this example, the load current I is the load factor It is assumed that the amount increases or decreases in proportion to.
また負荷率が増加する場合と減少する場合とでは同じ負
荷率であってもＧＴＲ駆動数に差を持たすように制御し
、選択スイッチ１３のチャタリングを防止している。Further, the number of GTR drives is controlled to be different between when the load factor increases and when the load factor decreases even if the load factor is the same, thereby preventing chattering of the selection switch 13.
すなわちＧＴＲ駆動数は負荷率が増加する時は第４図に
おけるＮのグラフに従い、減少する場合はＮ′のグラフ
に従って変化するようにする。That is, when the load factor increases, the GTR drive number changes according to the graph of N in FIG. 4, and when it decreases, it changes according to the graph of N'.
例えば設定段数切換スイッチｌｉｅを負荷率５０％と１
００％の２段階切換にすると、負荷が増加するとき、負
荷率Ｏ〜６７％の間はＧＴＲ駆動数選択信号信号Ｄが作
動してｌアームあたり４個のＧＴＲが駆動され、合計４
個ｘ６＝２４個のＧＴＲが駆動される。For example, set the setting stage number changeover switch lie to 50% load factor and 1
00%, when the load increases, the GTR driving number selection signal D is activated between the load factor O and 67%, and 4 GTRs are driven per l arm, for a total of 4 GTRs.
x6=24 GTRs are driven.
負荷率６７〜１００％の間はＧＴＲ駆動数選択記号記号
Ｆが全て作動し、１アームあたり６個、すなわち３６個
のＧＴＲが駆動される。Between the load factor of 67% and 100%, all the GTR drive number selection symbols F are activated, and 6 GTRs per arm, that is, 36 GTRs are driven.
負荷が減少するときは負荷率１００〜８０％の間はＧＴ
Ｒ駆動数選択記号記号Ｆが作動して３６個のＧＴＲが駆
動され、負荷率４８〜０％の間はＧＴＲ駆動数選択信号
信号Ｃ，が作動して１８個のＧＴＲが駆動される。When the load decreases, the load rate is between 100% and 80%.
The R driving number selection symbol F is activated to drive 36 GTRs, and during the load factor of 48 to 0%, the GTR driving number selection signal C is activated to drive 18 GTRs.
なお始動モードでは負荷率とは無関係にＧＴＲ駆動数選
択記号記号Ｆを作動させて全数（３６個）のＧＴＲを駆
動し、インバータの全加速容量を使用して円滑な始動が
行われる。In the starting mode, the GTR driving number selection symbol F is activated to drive all (36) GTRs regardless of the load factor, and smooth starting is performed using the entire acceleration capacity of the inverter.
また本実施例ではＧＴＲの並列数を６個としているが任
意の並列数に対しても本発明の適用が可能である。Further, in this embodiment, the number of parallel GTRs is six, but the present invention can be applied to any number of parallel GTRs.
以上説明したように本発明によれば、インバータの負荷
が変動した場合に、負荷率に見合った必要最小限のＧＴ
Ｒが駆動されるので、無駄な制御電流が消費されず、従
ってインバータの高効率運転が可能となる。As explained above, according to the present invention, when the load of the inverter fluctuates, the minimum necessary GT commensurate with the load factor can be
Since R is driven, unnecessary control current is not consumed, and therefore the inverter can be operated with high efficiency.
第１図は本発明の一実施例を示す回路図、第２図は従来
のインバータ装置の一例を示す回路図、第３図は負荷率
変動によるインバータの変換効率の変化の一例を示す特
性図、第４図は負荷率と負荷電流およびＧＴＲ駆動数の
関係を示す特性図、第５図は第１図における負荷率検出
回路の詳細を示す回路図、第６図は同じく選択スイッチ
駆動回路の詳細を示す回路図である。
１・・・交−直変換器
２・・・コンデンサ
３・・・直−交変換器
３ａ−３ｆ、 ４ａ−４ｆ、 ５ａ−５ｆ、 ６ａ−６
ｆ、 ７ａ−７ｆ、 ８ａ−８ｆ・・・ＧＴＲ（ジャイ
アントトランジスタ）９・・・誘導電動機
ｉｏ・・・変流器
１１・・・負荷率検出回路
１２・・・選択スイッチ駆動回路
１３・・・選択スイッチ
１４・・・ベーストライブ回路
１５・・・始動指令回路
代理人 弁理士 則 近 憲 佑
同 三俣弘文
第１図
第２図
■傅゛（・ム）
第３図Fig. 1 is a circuit diagram showing an embodiment of the present invention, Fig. 2 is a circuit diagram showing an example of a conventional inverter device, and Fig. 3 is a characteristic diagram showing an example of changes in inverter conversion efficiency due to load factor fluctuations. , Fig. 4 is a characteristic diagram showing the relationship between load factor, load current, and GTR drive number, Fig. 5 is a circuit diagram showing details of the load factor detection circuit in Fig. 1, and Fig. 6 is a diagram showing the details of the selection switch drive circuit. FIG. 3 is a circuit diagram showing details. 1... AC-DC converter 2... Capacitor 3... Orthogonal-AC converter 3a-3f, 4a-4f, 5a-5f, 6a-6
f, 7a-7f, 8a-8f...GTR (giant transistor) 9...induction motor io...current transformer 11...load factor detection circuit 12...selection switch drive circuit 13... Selection switch 14...Base tribe circuit 15...Starting command circuit Agent Patent attorney Nori Chika Ken Yudo Hirofumi MitsumataFigure 1Figure 2■傅゛(・mu)Figure 3
Claims (1)
インバータの制御回路において、上記各素子ごとに設け
た駆動用選択スイッチと、インバータの出力電流からイ
ンバータの負荷率を検出する負荷率検出回路と、上記負
荷率に応じて上記選択スイッチを選択して並列接続され
た素子の中の所要数の素子のみを通電させる選択スイッ
チ駆動回路を備えたことを特徴とするインバータの制御
回路。In an inverter control circuit in which each phase of an inverter is configured by connecting multiple elements in parallel, there is a drive selection switch provided for each element, and a load that detects the inverter load factor from the inverter output current. An inverter control circuit comprising: a ratio detection circuit; and a selection switch drive circuit that selects the selection switch according to the load ratio and energizes only a required number of elements among the elements connected in parallel. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61016811A JPS62178174A (en) | 1986-01-30 | 1986-01-30 | Control circuit for inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61016811A JPS62178174A (en) | 1986-01-30 | 1986-01-30 | Control circuit for inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62178174A true JPS62178174A (en) | 1987-08-05 |
Family
ID=11926540
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61016811A Pending JPS62178174A (en) | 1986-01-30 | 1986-01-30 | Control circuit for inverter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62178174A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102447401A (en) * | 2011-12-31 | 2012-05-09 | 南京理工大学 | Power inverter |
| JP2017135883A (en) * | 2016-01-28 | 2017-08-03 | 株式会社デンソー | Inverter device |
| JP2021069248A (en) * | 2019-10-28 | 2021-04-30 | 株式会社デンソー | Electric drive system |
-
1986
- 1986-01-30 JP JP61016811A patent/JPS62178174A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102447401A (en) * | 2011-12-31 | 2012-05-09 | 南京理工大学 | Power inverter |
| JP2017135883A (en) * | 2016-01-28 | 2017-08-03 | 株式会社デンソー | Inverter device |
| JP2021069248A (en) * | 2019-10-28 | 2021-04-30 | 株式会社デンソー | Electric drive system |
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