JPH04131196U - inverter device - Google Patents
inverter deviceInfo
- Publication number
- JPH04131196U JPH04131196U JP3556691U JP3556691U JPH04131196U JP H04131196 U JPH04131196 U JP H04131196U JP 3556691 U JP3556691 U JP 3556691U JP 3556691 U JP3556691 U JP 3556691U JP H04131196 U JPH04131196 U JP H04131196U
- Authority
- JP
- Japan
- Prior art keywords
- resistor
- value
- switching element
- resistance value
- inverter device
- 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 10
- 230000001172 regenerating effect Effects 0.000 abstract description 19
- 230000000694 effects Effects 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
Landscapes
- Stopping Of Electric Motors (AREA)
Abstract
(57)【要約】
【構成】 本考案は、直流リンク部に抵抗器及びスイッ
チング素子を直列に接続し、交流出力側に接続された電
動機からの回生電力を前記抵抗器で消費させる構造を有
するインバータ装置において、前記抵抗器の抵抗値を検
出する検出手段と、この検出手段からの検出値を基に、
前記スッチング素子のオンオフを制御する制御手段とを
有する。
【効果】 本考案によれば、抵抗器の抵抗値を検出し、
この検出値に基いて、回生スイッチング素子を動作制御
するようにしたので、誤って抵抗器の抵抗値を所定値以
下の小さい値としたり、接続を誤って短絡させた場合に
も、過大電流にるスイッチング素子の破損を未然に防止
することがてきるという効果を奏する。
(57) [Summary] [Structure] The present invention has a structure in which a resistor and a switching element are connected in series to the DC link part, and the regenerated power from the motor connected to the AC output side is consumed by the resistor. In the inverter device, there is a detection means for detecting the resistance value of the resistor, and based on the detected value from this detection means,
and control means for controlling on/off of the switching element. [Effect] According to the present invention, the resistance value of the resistor is detected,
Since the operation of the regenerative switching element is controlled based on this detected value, even if the resistance value of the resistor is accidentally set to a small value below a predetermined value, or if the connection is accidentally short-circuited, excessive current can be prevented. This has the effect of being able to prevent damage to the switching elements caused by damage.
Description
［考案の目的］ [Purpose of invention]
【０００１】0001
本考案は、電動機を可変速制御するインバータ装置に関する。 The present invention relates to an inverter device for variable speed control of an electric motor.
【０００２】0002
図２は、電動機を負荷とする従来のインバータ装置を示す回路構成図である。 同図において、１は商用電源，２は整流回路，３は整流回路２の出力を平滑化す る平滑コンデンサ，４はトランジスタ等で構成されている逆変換回路，５は逆変 換回路４の交流側に接続した負荷の電動機，６は回生放電抵抗器，７は回生電力 抵抗器６と直列に接続したトランジスタ等のスイッチング素子，８はスイッチン グ素子７の回生電力放電制御回路である。 FIG. 2 is a circuit configuration diagram showing a conventional inverter device that uses an electric motor as a load. In the figure, 1 is a commercial power supply, 2 is a rectifier circuit, and 3 is a smoother for the output of the rectifier circuit 2. 4 is an inverse conversion circuit composed of transistors, etc., and 5 is an inverse conversion circuit. The load motor is connected to the AC side of the switching circuit 4, 6 is a regenerative discharge resistor, and 7 is regenerative power. A switching element such as a transistor connected in series with resistor 6, 8 is a switching element. This is a regenerative power discharge control circuit for the control element 7.
【０００３】 次に動作について説明する。商用電源１からの交流出力が整流回路２と平滑コ ンデンサ３により直流に変換され、逆変換回路４によって再び所望する周波数の 交流に変換されて、電動機５に供給されることは周知である。0003 Next, the operation will be explained. AC output from commercial power supply 1 is connected to rectifier circuit 2 and smoothing circuit It is converted into direct current by the capacitor 3, and then converted back to the desired frequency by the inverse conversion circuit 4. It is well known that the electric current is converted into alternating current and supplied to the electric motor 5.
【０００４】 一方、電動機５が減速する場合は、この電動機からの回生電力は逆変換回路４ を介してコンデンサ３に蓄えられ、ＤＣリンク部の電圧ＶDCは上昇する。電動機 からの回生が続くと、電圧ＶDCはさらに上昇し、遂にはインバータ構成素子を破 損に至らしめるため、の電圧ＶDCを検出し、一定値以上に上昇すると、回生電力 放電制御回路８によりスイッチング素子７を導通させるようにする。On the other hand, when the electric motor 5 decelerates, regenerated power from the electric motor is stored in the capacitor 3 via the inverse conversion circuit 4, and the voltage V DC of the DC link section increases. As regeneration from the motor continues, the voltage V DC will further rise, eventually causing damage to the inverter components. Therefore, when the voltage V DC is detected and rises above a certain value, the regenerative power discharge control circuit 8 The switching element 7 is made conductive.
【０００５】 このようにすることにより、電動機５からの回生電力は回生電力放電抵抗器６ で消費され、ＤＣリンク部の上昇は抑えられる。そして、ＤＣリンク部の電圧ＶDC が規定値以下に復帰すると、スイッチング素子７をオフさせるように制御する 。[0005] By doing so, the regenerated power from the electric motor 5 is consumed by the regenerated power discharge resistor 6, and the rise in the DC link portion is suppressed. Then, when the voltage V DC of the DC link section returns to a specified value or less, the switching element 7 is controlled to be turned off.
【０００６】 ここで、回生電力が大きい場合、回生電力放電抵抗器６はそれに伴って容量の 大きなものが必要となり、また、放熱の必要も生じてくる。そこでスイッチング 素子７，回生電力放電制御回路８はインバータ装置内のものを使用し、回生電力 放電抵抗器６はインバータ装置とは別に、使用条件に合わせて設けるのが一般的 である。[0006] Here, when the regenerative power is large, the regenerative power discharging resistor 6 has a large capacity. A large device is required, and heat dissipation is also required. switching there The element 7 and the regenerative power discharge control circuit 8 are those in the inverter device, and the regenerative power Generally, the discharge resistor 6 is provided separately from the inverter device, depending on the usage conditions. It is.
【０００７】[0007]
しかし、回生電力放電抵抗器６をインバータ装置とは別に設けるシステム構成 において、その抵抗値を誤って所定値以下の小さな値としたり、接続を誤って短 絡させた場合に、回生電力制御回路８が動作しスイッチング素子７には過大な電 流が流れスイッチング素子７の流すことのできる電流を越える場合には破損に至 らしめるという問題点があった。 However, a system configuration in which the regenerative power discharge resistor 6 is provided separately from the inverter device , the resistance value may be mistakenly set to a small value below the specified value, or the connection may be mistakenly shortened. When the circuit is connected, the regenerative power control circuit 8 operates and the switching element 7 receives excessive current. If the current exceeds the current that can flow through the switching element 7, damage may occur. There was a problem with making it clear.
【０００８】 そこで、本考案は、上記の問題点を解決するためになされたもので、インバー タ装置とは別に設けられた抵抗器の抵抗値を検出し、その検出値に応じてスイッ チング素子を動作制御することにより、過大電流による破損を防ぐことができる インバータ装置を提供することを目的とする。 ［考案の構成］[0008] Therefore, this invention was devised to solve the above problems. The resistance value of a resistor installed separately from the sensor device is detected, and the switch is activated according to the detected value. Damage caused by excessive current can be prevented by controlling the operation of the switching element. The purpose is to provide an inverter device. [Structure of the idea]
【０００９】[0009]
上記目的を達成するために、本考案のインバータ装置は、直流リンク部に抵抗 器及びスイッチング素子を直列に接続し、交流出力側に接続された電動機からの 回生電力を前記抵抗器で消費させる構造を有するインバータ装置において、前記 抵抗器の抵抗値を検出する検出手段と、この検出手段からの検出値を基に、前記 スッチング素子のオンオフを制御する制御手段とを備えたインバータ装置を提供 する。 In order to achieve the above purpose, the inverter device of the present invention has a resistance in the DC link part. The switch and switching element are connected in series, and the output from the motor connected to the AC output side is In the inverter device having a structure in which the regenerated power is consumed by the resistor, the A detection means for detecting the resistance value of the resistor, and based on the detected value from this detection means, the above-mentioned Provides an inverter device equipped with a control means for controlling on/off of switching elements. do.
【００１０】0010
以上のように構成された本考案のインバータ装置においては、抵抗器の抵抗値 を検出する検出手段からの検出信号に基づいて、抵抗器の抵抗値が所定値以下の 場合には回生電力放電用のスイッチング素子を動作させぬようにするため、誤っ て抵抗器の抵抗値を所定値以下の小さな値としたり、接続を誤って短絡させた場 合にも、過大電流によるスイッチング素子の破損を未然に防止することができる 。 In the inverter device of the present invention configured as described above, the resistance value of the resistor is Based on the detection signal from the detection means that detects In order to prevent the switching element for regenerative power discharge from operating, If the resistance value of the resistor is set to a small value below the specified value or if the connection is accidentally shorted, This can prevent damage to switching elements due to excessive current even when .
【００１１】[0011]
以下、本考案の一実施例を図面を用いて説明する。なお、図２と同一符号を付 し、その説明は省略する。 An embodiment of the present invention will be described below with reference to the drawings. Note that the same symbols as in Figure 2 are given. However, the explanation thereof will be omitted.
【００１２】 図１において、９は逆流阻止用ダイオード，１０，１１は抵抗値を検出する抵 抗、１２はツェナーダイオード，１３は抵抗値検出手段としてのフォトカプラ， １４は抵抗値検出の基準電圧を作るツェナーダイオード，１５は抵抗，１６はフ ォトカプラ１３の出力側に接続された負荷抵抗で、図のように負荷抵抗１６の一 端、つまりＡ点からフォトカプラ１３のオン，オフ信号が回生電力放電制御回路 に入力される。0012 In Figure 1, 9 is a backflow blocking diode, 10 and 11 are resistors for detecting the resistance value. 12 is a Zener diode, 13 is a photocoupler as a resistance value detection means, 14 is a Zener diode that creates a reference voltage for resistance value detection, 15 is a resistor, and 16 is a filter. A load resistor connected to the output side of the photocoupler 13, and one of the load resistors 16 as shown in the figure. The on/off signal of the photocoupler 13 from the end, that is, point A, is the regenerative power discharge control circuit. is input.
【００１３】 次に、本実施例の動作について説明する。抵抗１１に印加される電圧は、ツェ ナーダイオード１４のツェナー電圧で定まる電圧を抵抗６，１０，１１で分圧し た値となる。ここで、ツェナーダイオード１４のツェナー電圧をＶ14，抵抗６， １０，１１の抵抗値をそれぞれＲ6 ，Ｒ10，Ｒ11，抵抗１１に印加される電圧を Ｖ11，ダイオード９の順方向降下電圧をＶ9 とすれば、Ｖ11は Ｖ11＝｛Ｒ11／（Ｒ6 ＋Ｒ10＋Ｒ11）｝・（Ｖ14−Ｖ9 ） …（１） となる。 また、ツェナーダイオード１２のツェナー電圧をＶ12，フォトカプラ１３の一 次側ダイオードの順方向降下電圧をＶ13とすれば、 Ｖ11＞Ｖ12＋Ｖ13 …（２） のとき、フォトカプラ１３は導通状態となり、Ａ点の電位は“Ｈ”レベルとなる 。逆に Ｖ11≦Ｖ12＋Ｖ13 …（３） の時は、フォトカプラ１３は非導通状態になりＡ点の電位は“Ｌ”レベルとなる 。 さらに、回生電力放電制御回路８はＡ点の電位が“Ｈ”の時スイッチング素子 ７を動作させないように動作する。Next, the operation of this embodiment will be explained. The voltage applied to the resistor 11 is a value obtained by dividing the voltage determined by the Zener voltage of the Zener diode 14 by the resistors 6, 10, and 11. Here, the Zener voltage of the Zener diode 14 is V14 , the resistance values of the resistors 6 , 10, and 11 are R6, R10 , R11 , respectively, the voltage applied to the resistor 11 is V11 , and the forward drop of the diode 9 is V14. If the voltage is V 9 , then V 11 is as follows: V 11 = {R 11 /(R 6 +R 10 +R 11 )}·(V 14 −V 9 ) (1). Further, if the Zener voltage of the Zener diode 12 is V 12 and the forward voltage drop of the primary side diode of the photocoupler 13 is V 13 , then when V 11 >V 12 +V 13 (2), the photocoupler 13 becomes conductive. state, and the potential at point A becomes "H" level. Conversely, when V 11 ≦V 12 +V 13 (3), the photocoupler 13 becomes non-conductive and the potential at point A becomes "L" level. Further, the regenerative power discharge control circuit 8 operates so as not to operate the switching element 7 when the potential at the point A is "H".
【００１４】 即ち、回生電力放電抵抗器６の抵抗値Ｒ6 が所定値（Ｒ6 の下限値）以下のと き、（２）式が成り立つように抵抗１０，１１の抵抗値Ｒ10，Ｒ11，ツェナー電 圧Ｖ12，Ｖ14を選べば、誤って回生電力放電抵抗器６の抵抗値を所定値以下の小 さい値としたり、接続を誤って短絡した場合には（１）式より抵抗１１に印加さ れる電圧Ｖ11が高くなるため、（２）式が成り立ち、フォトカプラ１３は導通し 、Ａ点の電位が“Ｈ”となり、スイッチング素子７を動作させないようにし、過 大電流でスイッチング素子７が破損することを防止することができる。That is, when the resistance value R 6 of the regenerative power discharge resistor 6 is equal to or less than a predetermined value (lower limit value of R 6 ), the resistance values R 10 and R 11 of the resistors 10 and 11 are adjusted so that the formula (2) holds true. , Zener voltages V 12 and V 14 , if the resistance value of the regenerative power discharging resistor 6 is accidentally set to a small value below the predetermined value, or if the connection is accidentally shorted, Since the applied voltage V 11 becomes higher, equation (2) holds true, the photocoupler 13 becomes conductive, and the potential at point A becomes "H", preventing the switching element 7 from operating, and causing the switching element 7 to fail due to excessive current. can be prevented from being damaged.
【００１５】 抵抗１５の抵抗値を十分大きな値（数＋ｋΩ〜数百ｋΩ）とし、ツェナーダイ オード１４のツェナー電圧Ｖ14を小さな値（数＋Ｖ以下）に選べば、消費電力が 少なくて済むため、回路の小形化を図ることができる。If the resistance value of the resistor 15 is set to a sufficiently large value (several + kΩ to several hundred kΩ) and the Zener voltage V 14 of the Zener diode 14 is selected to be a small value (several + V or less), power consumption can be reduced. The circuit can be made smaller.
【００１６】[0016]
以上のように、本考案によれば、抵抗器の抵抗値を検出し、この検出値に基い て、回生スイッチング素子を動作制御するようにしたので、誤って抵抗器の抵抗 値を所定値以下の小さい値としたり、接続を誤って短絡させた場合にも、過大電 流にるスイッチング素子の破損を未然に防止することがてきるという効果を奏す る。 As described above, according to the present invention, the resistance value of the resistor is detected, and based on this detected value, Because I controlled the operation of the regenerative switching element, I accidentally changed the resistance of the resistor. Excessive voltage can also be caused by setting the value to a small value below the specified value or by accidentally shorting the connection. This has the effect of preventing damage to switching elements caused by current. Ru.
【図１】本考案の一実施例を示す概要構成図。FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention.
【図２】従来のインバータ装置を示す概要構成図。FIG. 2 is a schematic configuration diagram showing a conventional inverter device.
４は逆変換回路、６は回生電力放電抵抗器、７はスイッ
チング素子、８は回生電力放電制御回路、１２，１４は
ツェナーダイオード、１０，１１，１５，１６は抵抗、
１３はフォトカプラである。4 is an inverse conversion circuit, 6 is a regenerative power discharge resistor, 7 is a switching element, 8 is a regenerative power discharge control circuit, 12, 14 are Zener diodes, 10, 11, 15, 16 are resistors,
13 is a photocoupler.
Claims (1)
素子を直列に接続し、交流出力側に接続された電動機か
らの回生電力を前記抵抗器で消費させる構造を有するイ
ンバータ装置において、前記抵抗器の抵抗値を検出する
検出手段と、この検出手段からの検出値を基に、前記ス
イッチング素子のオンオフを制御する制御手段とを具備
したことを特徴するインバータ装置。1. An inverter device having a structure in which a resistor and a switching element are connected in series to a DC link part, and the regenerated power from a motor connected to an AC output side is consumed by the resistor. An inverter device comprising: a detection means for detecting a resistance value; and a control means for controlling on/off of the switching element based on the detected value from the detection means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3556691U JPH04131196U (en) | 1991-05-20 | 1991-05-20 | inverter device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3556691U JPH04131196U (en) | 1991-05-20 | 1991-05-20 | inverter device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04131196U true JPH04131196U (en) | 1992-12-02 |
Family
ID=31917688
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3556691U Pending JPH04131196U (en) | 1991-05-20 | 1991-05-20 | inverter device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04131196U (en) |
-
1991
- 1991-05-20 JP JP3556691U patent/JPH04131196U/en active Pending
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