JP3057992B2 - Charge / discharge circuit - Google Patents
Charge / discharge circuitInfo
- Publication number
- JP3057992B2 JP3057992B2 JP5346910A JP34691093A JP3057992B2 JP 3057992 B2 JP3057992 B2 JP 3057992B2 JP 5346910 A JP5346910 A JP 5346910A JP 34691093 A JP34691093 A JP 34691093A JP 3057992 B2 JP3057992 B2 JP 3057992B2
- Authority
- JP
- Japan
- Prior art keywords
- electromagnetic contactor
- contact
- resistor
- discharge
- circuit
- 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.)
- Expired - Fee Related
Links
Landscapes
- Control Of Voltage And Current In General (AREA)
- Inverter Devices (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は直流を交流に変換する逆
変換装置の直流部に使用されている電解コンデンサの充
放電回路に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charging / discharging circuit for an electrolytic capacitor used in a DC section of an inverter for converting DC into AC.
【０００２】[0002]
【従来の技術】インバータは、直流部を電圧源として働
かせる必要があるために、大容量の電解コンデンサが必
要である。従来の逆変換装置では、始動時に電磁接触器
を投入し、直流部に使用されている電解コンデンサに電
荷を充電していた。また、停止後の点検時には、電解コ
ンデンサに溜った電荷を放電するために、直流回路のプ
ラス側とマイナス側に放電抵抗を接続するか、常に放電
抵抗を接続しておく放電回路が使用されていた。図２は
従来の充放電回路の一例であり、２０は放電抵抗、２１
は電池、２２は電磁接触器、２３はインバータ、２４は
制御回路電源、２５は電解コンデンサ、２６、２７は直
流回路接続用クリップである。始動時に、電磁接触器２
２を投入し電解コンデンサ２５に電荷を充電する。停止
後の点検時に、放電抵抗２０を取り付けた直流回路接続
用クリップ２６、２７を電解コンデンサ２５の両端に接
続することによって、残留していた電荷を放電させる。
図３は従来の充放電回路の他の一例であり、３０は放電
抵抗、３１は電池、３２は電磁接触器、３３はインバー
タ、３４は制御回路電源、３５は電解コンデンサであ
る。図３について、充電は図２と同様で電磁接触器３２
を投入することにより電解コンデンサ３５に電荷を充電
する。放電については、常に接続されている放電抵抗３
０は電荷を放電しようとするが、電池３１から電力を供
給されるため、電荷は放電されない。しかし、この電力
の供給がなくなると放電抵抗３０によって電解コンデン
サ３５の電荷を放電する。2. Description of the Related Art An inverter requires a large-capacity electrolytic capacitor because it is necessary to use a DC part as a voltage source. In a conventional inverting device, an electromagnetic contactor is turned on at the time of starting to charge an electrolytic capacitor used in a DC unit with electric charge. Also, at the time of inspection after shutdown, in order to discharge the electric charge accumulated in the electrolytic capacitor, a discharge resistor is connected to the positive and negative sides of the DC circuit, or a discharge circuit that always connects the discharge resistor is used. Was. FIG. 2 shows an example of a conventional charge / discharge circuit.
Is a battery, 22 is an electromagnetic contactor, 23 is an inverter, 24 is a control circuit power supply, 25 is an electrolytic capacitor, and 26 and 27 are DC circuit connection clips. At startup, the electromagnetic contactor 2
2 is charged to charge the electrolytic capacitor 25 with electric charge. At the time of inspection after the stoppage, the remaining charges are discharged by connecting the DC circuit connection clips 26 and 27 to which the discharge resistor 20 is attached to both ends of the electrolytic capacitor 25.
FIG. 3 shows another example of a conventional charge / discharge circuit, in which 30 is a discharge resistor, 31 is a battery, 32 is an electromagnetic contactor, 33 is an inverter, 34 is a control circuit power supply, and 35 is an electrolytic capacitor. 3, charging is the same as in FIG.
To charge the electrolytic capacitor 35 with electric charges. Regarding the discharge, the discharge resistor 3 which is always connected
A value of 0 tries to discharge the electric charge, but the electric power is supplied from the battery 31, so that the electric charge is not discharged. However, when the supply of the power is stopped, the charge of the electrolytic capacitor 35 is discharged by the discharge resistor 30.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、図２、
図３の充放電回路では、電源投入時、過渡的に大きな充
電電流が発生する。そのためインバータ２３、３３を破
壊してしまうことがある。図２の回路では停止後の点検
時、放電抵抗２０をつけ忘れて、電荷が残留したままと
なり、感電の危険があったり、点検後はずすのを忘れ、
放電抵抗２０を過熱、損傷することがあった。また、図
３の回路では、常に放電抵抗３０で電力が消費されるた
めに損失が増加してしまう。また、消費電力を減少させ
るために抵抗値の高いものを使用すると、放電時間が長
くなる欠点があった。However, FIG.
In the charging / discharging circuit of FIG. 3, a large charging current occurs transiently when the power is turned on. Therefore, the inverters 23 and 33 may be destroyed. In the circuit shown in FIG. 2, at the time of inspection after stopping, the operator forgets to attach the discharge resistor 20 and the electric charge remains, and there is a danger of electric shock.
In some cases, the discharge resistor 20 was overheated and damaged. Further, in the circuit of FIG. 3, since power is always consumed by the discharge resistor 30, the loss increases. Further, if a resistor having a high resistance value is used in order to reduce power consumption, there is a drawback that the discharge time becomes longer.
【０００４】そこで本発明では、始動時に充電抵抗１７
を電解コンデンサ１５に直列に接続することによって過
渡的に大きな充電電流を発生させることなく電解コンデ
ンサ１５に電荷を充電し、また、通常運転時、放電抵抗
１０の加熱、損傷を防止し、消費電力を減少させるため
に、充電抵抗１７、放電抵抗１０を電解コンデンサ１５
から切り離し、停止時には、電解コンデンサ１５に放電
抵抗１０を自動的に接続することによって、放電抵抗１
０の接続忘れを防止することができる充放電回路を提供
することを目的とする。Therefore, according to the present invention, at the time of starting, the charging resistor 17 is used.
Is connected in series to the electrolytic capacitor 15 to charge the electrolytic capacitor 15 without generating a transiently large charging current. In addition, during normal operation, heating and damage of the discharge resistor 10 are prevented, and power consumption is reduced. To reduce the charge resistance 17 and the discharge resistance 10
When stopped, the discharge resistor 10 is automatically connected to the electrolytic capacitor 15 so that the discharge resistor 1
An object of the present invention is to provide a charge / discharge circuit capable of preventing forgetting to connect 0.
【０００５】[0005]
【課題を解決するための手段】本発明では、上記課題を
解決するために、直流発生部と、前記直流発生部から発
生した直流を交流に変換するインバータと、前記直流発
生部とインバータとを接続する正と負の配線間に並列接
続した電解コンデンサと放電抵抗とからなる並列回路
と、前記直流発生部と前記並列回路との間の部分に位置
する前記正と負の配線のうち一方に挿入した充電抵抗か
らなる、直流を交流に変換する逆変換装置の充放電回路
において、それぞれ補助接点を持つ第１の電磁接触器と
第２の電磁接触器を設け、前記第１の電磁接触器におけ
る主接点（以降第１の主接点とする）を前記充電抵抗に
並列に接続し、前記第２の電磁接触器における主接点
（以降第２の主接点とする）を、前記第１の主接点と並
列をなす範囲にて前記充電抵抗に直列に接続し、前記第
１の電磁接触器と第２の電磁接触器におけるそれぞれの
補助接点（以降それぞれ第１の補助接点、第２の補助接
点とする）を、前記電解コンデンサと並列をなす範囲に
て、前記放電抵抗に直列に接続し、いずれの補助接点も
主接点に対し常閉接点とされていることを特徴とする。According to the present invention, in order to solve the above problems, a DC generator, an inverter for converting DC generated from the DC generator to AC, and a DC generator and an inverter are provided. A parallel circuit consisting of an electrolytic capacitor and a discharge resistor connected in parallel between the positive and negative wires to be connected, and one of the positive and negative wires located in a portion between the DC generator and the parallel circuit. A charging / discharging circuit of an inverter for converting a direct current to an alternating current comprising an inserted charging resistor, wherein a first electromagnetic contactor and a second electromagnetic contactor each having an auxiliary contact are provided; , The main contact (hereinafter referred to as a first main contact) is connected in parallel to the charging resistor, and the main contact (hereinafter referred to as a second main contact) in the second electromagnetic contactor is connected to the first main contact. Within the range parallel to the contacts The first and second auxiliary contactors (hereinafter referred to as a first auxiliary contact and a second auxiliary contact, respectively) in the first electromagnetic contactor and the second electromagnetic contactor are connected in series to a resistance, It is characterized in that the auxiliary contacts are connected in series to the discharge resistor within a parallel range, and any auxiliary contact is a normally closed contact with respect to the main contact.
【０００６】[0006]
【作用】上記のように構成した、本発明の充放電回路に
よれば、始動時に第２の主接点を投入することによっ
て、充電抵抗が電解コンデンサに接続され過渡的に大き
な充電電流を発生させずに充電される。この時、開とな
った第２の補助接点が放電抵抗に直列に接続されている
ので、放電抵抗に充電電流が流れることはない。充電完
了後、第１の主接点を投入し、第２の主接点を開放する
ことによって通常運転に入るが、この時点で充電抵抗は
電解コンデンサより切り離され電力を消費しなくなる。
同時に、開となった第１の補助接点が放電抵抗に直列に
接続されているので、通常運転中においても、放電抵抗
に充電電流が流れることはない。停止時には、第１の主
接点を開放することによって、第１の補助接点は閉とな
り、一方、先の通常運転に入る時点で第２の主接点を開
放したことから第２の補助接点も閉となっており、放電
抵抗が電解コンデンサに接続され、電解コンデンサに溜
っていた電荷は放電される。According to the charging / discharging circuit of the present invention, the charging resistor is connected to the electrolytic capacitor to generate a transiently large charging current by turning on the second main contact at the time of starting. Without being charged. At this time, since the opened second auxiliary contact is connected in series to the discharge resistor, no charging current flows through the discharge resistor. After charging is completed, the first main contact is turned on and the second main contact is opened to start normal operation. At this point, the charging resistor is disconnected from the electrolytic capacitor and consumes no power.
At the same time, since the opened first auxiliary contact is connected in series to the discharge resistor, no charging current flows through the discharge resistor even during normal operation. At the time of stoppage, the first auxiliary contact is closed by opening the first main contact, while the second auxiliary contact is also closed by opening the second main contact at the time of the previous normal operation. The discharge resistor is connected to the electrolytic capacitor, and the electric charge stored in the electrolytic capacitor is discharged.
【０００７】[0007]
【実施例】図１に本発明の充放電回路の一例を示す。図
１において、１０は放電抵抗、１１は電池、１２は第１
の補助接点付き電磁接触器、１３はインバータ、１４は
制御回路電源、１５は電解コンデンサ、１６は第２の補
助接点付き電磁接触器、１７は充電抵抗である。逆変換
装置の始動前時点では、第１の補助接点付き電磁接触器
１２の主接点１２ａは開、補助接点１２ｂは閉、第２の
補助接点付き電磁接触器１６の主接点１６ａは開、その
補助接点１６ｂは閉の状態である。始動時、第２の主接
点１６ａを投入することにより充電抵抗１７は電解コン
デンサ１５に接続され、電解コンデンサは充電を開始す
る。第２の主接点を閉にすると同時にその補助接点１６
ｂは開となるので充電電流が放電抵抗１０の回路に流れ
ることはない。充電後、第１の主接点１２ａを投入し、
又、第２の主接点１６ａを開放することにより、充電抵
抗１７を電解コンデンサ１５から切り離して、通常運転
に入る。この始動以降の一連の操作を、図示はしていな
いがタイマー等を用いた自動制御装置を用いて行うよう
にしてもよい。この場合は更に省力化を図ることができ
る。通常運転中は、第１の主接点１２ａが投入（閉）さ
れているため、その補助接点１２ｂは開であり、放電抵
抗１０の回路は電解コンデンサ１５から切り離されてお
り、変換電力を消費することはない。停止時には、第１
の主接点１２ａを開放する。その場合、その補助接点１
２ｂが閉じ、一方、通常運転に入った時点で第２の補助
接点１６ｂも閉じているので電解コンデンサ１５に放電
抵抗１０が接続され、電解コンデンサの電荷が放電され
る。FIG. 1 shows an example of a charge / discharge circuit according to the present invention. In FIG. 1, 10 is a discharge resistance, 11 is a battery, and 12 is a first
, An electromagnetic contactor with auxiliary contacts, 13 an inverter, 14 a control circuit power supply, 15 an electrolytic capacitor, 16 an electromagnetic contactor with a second auxiliary contact, and 17 a charging resistor. Before starting the inverter, the main contact 12a of the first electromagnetic contactor 12 with auxiliary contacts is open, the auxiliary contact 12b is closed, and the main contact 16a of the second electromagnetic contactor 16 with auxiliary contacts is open. The auxiliary contact 16b is in a closed state. At startup, the charging resistor 17 is connected to the electrolytic capacitor 15 by turning on the second main contact 16a, and the electrolytic capacitor starts charging. When the second main contact is closed, its auxiliary contact 16
Since b is open, the charging current does not flow through the circuit of the discharge resistor 10. After charging, the first main contact 12a is turned on,
Further, by opening the second main contact 16a, the charging resistor 17 is disconnected from the electrolytic capacitor 15, and the normal operation starts. Although not shown, a series of operations after the start may be performed using an automatic control device using a timer or the like. In this case, labor saving can be further achieved. During normal operation, the first main contact 12a is turned on (closed), the auxiliary contact 12b is open, the circuit of the discharge resistor 10 is disconnected from the electrolytic capacitor 15, and the converted power is consumed. Never. When stopped, the first
Main contact 12a is opened. In that case, the auxiliary contact 1
2b is closed, while the second auxiliary contact 16b is also closed at the time of normal operation, so that the discharge resistor 10 is connected to the electrolytic capacitor 15, and the electric charge of the electrolytic capacitor is discharged.
【０００８】[0008]
【発明の効果】このように、本発明では、始動時は、過
渡的に大きな充電電流を発生させることなく電解コンデ
ンサに電荷を充電できる。また、第１、第２の補助接点
付き電磁接触器の補助接点（常閉接点）の２つの接点を
直列に放電抵抗に接続することにより、始動時及び通常
運転時においては複雑な制御を要せず自動的に放電抵抗
が電解コンデンサから切り離され、放電抵抗回路による
始動時の充電電力及び逆変換時の変換電力の損失を防ぐ
ことができるとともに、停止時には、電解コンデンサの
電荷の放電を確実に実施できる。通常運転時では充電抵
抗も切り離されるため、充電抵抗及び放電抵抗の両抵抗
での電力消費はなくなり、過熱、損傷もない。放電抵抗
は、低い抵抗値のものとすることができ、短時間で電解
コンデンサの電荷が放電ができる。As described above, according to the present invention, at the time of starting, the electric charge can be charged in the electrolytic capacitor without generating a large transient charging current. In addition, by connecting two contacts of the auxiliary contact (normally closed contact) of the first and second electromagnetic contactors with auxiliary contact to the discharge resistor in series, complicated control is required at the time of startup and during normal operation. The discharge resistor is automatically disconnected from the electrolytic capacitor without the need to prevent loss of charge power at start-up by the discharge resistor circuit and conversion power at the time of reverse conversion. Can be implemented. During normal operation, the charge resistor is also disconnected, so that power consumption by both the charge resistor and the discharge resistor is eliminated, and there is no overheating or damage. The discharge resistor can have a low resistance value, and the electric charge of the electrolytic capacitor can be discharged in a short time.
【図１】本発明の充放電回路の一例を示す回路図であ
る。FIG. 1 is a circuit diagram showing an example of a charge / discharge circuit of the present invention.
【図２】従来の充放電回路の一例を示す回路図である。FIG. 2 is a circuit diagram showing an example of a conventional charge / discharge circuit.
【図３】従来の充放電回路の他の一例を示す回路図であ
る。FIG. 3 is a circuit diagram showing another example of a conventional charge / discharge circuit.
１０，２０，３０ 放電抵抗 １１，２１，３１ 電池 １２ 第１の補助接点付き電磁接触器 １２ａ 第１の主接点 １２ｂ 第１の補助接点 １３，２３，３３ インバータ １４，２４，３４ 制御回路電源 １５，２５，３５ 電解コンデンサ １６ 第２の補助接点付き電磁接触器 １６ａ 第２の主接点 １６ｂ 第２の補助接点 １７ 充電抵抗 ２２，３２ 電磁接触器 ２６，２７ 直流回路接続用クリップ 10, 20, 30 Discharge resistance 11, 21, 31 Battery 12 Electromagnetic contactor with first auxiliary contact 12a First main contact 12b First auxiliary contact 13,23,33 Inverter 14,24,34 Control circuit power supply 15 , 25, 35 electrolytic capacitor 16 second electromagnetic contactor with auxiliary contact 16a second main contact 16b second auxiliary contact 17 charging resistor 22,32 electromagnetic contactor 26,27 DC circuit connection clip
Claims (1)
した直流を交流に変換するインバータと、前記直流発生
部とインバータとを接続する正と負の配線間に並列接続
した電解コンデンサと放電抵抗とからなる並列回路と、
前記直流発生部と前記並列回路との間の部分に位置する
前記正と負の配線のうち一方に挿入した充電抵抗からな
る、直流を交流に変換する逆変換装置の充放電回路にお
いて、 それぞれ補助接点を持つ第１の電磁接触器と第２の電磁
接触器を設け、 前記第１の電磁接触器における主接点を前記充電抵抗に
並列に接続し、 前記第２の電磁接触器における主接点を、前記第１の電
磁接触器における主接点と並列をなす範囲にて前記充電
抵抗に直列に接続し、 前記第１の電磁接触器と第２の電磁接触器におけるそれ
ぞれの補助接点を、前記電解コンデンサと並列をなす範
囲にて、前記放電抵抗に直列に接続し、 いずれの補助接点も主接点に対し常閉接点とされている
ことを特徴とする逆変換装置の充放電回路。1. A DC generator, an inverter for converting DC generated by the DC generator to AC, an electrolytic capacitor connected in parallel between positive and negative wires connecting the DC generator and the inverter, and a discharger. A parallel circuit consisting of a resistor and
In a charging / discharging circuit of an inverter for converting DC into AC, comprising a charging resistor inserted into one of the positive and negative wirings located at a portion between the DC generator and the parallel circuit, Providing a first electromagnetic contactor and a second electromagnetic contactor having contacts, connecting a main contact in the first electromagnetic contactor in parallel with the charging resistor, and connecting a main contact in the second electromagnetic contactor , Connected in series to the charging resistor in a range parallel to the main contact in the first electromagnetic contactor, and connecting each auxiliary contact in the first electromagnetic contactor and the second electromagnetic contactor to the electrolytic contact. A charge / discharge circuit for an inverting device, characterized in that the auxiliary contact is connected in series to the discharge resistor within a range parallel to the capacitor, and each auxiliary contact is a normally closed contact with respect to the main contact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5346910A JP3057992B2 (en) | 1993-12-27 | 1993-12-27 | Charge / discharge circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5346910A JP3057992B2 (en) | 1993-12-27 | 1993-12-27 | Charge / discharge circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07194136A JPH07194136A (en) | 1995-07-28 |
| JP3057992B2 true JP3057992B2 (en) | 2000-07-04 |
Family
ID=18386645
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5346910A Expired - Fee Related JP3057992B2 (en) | 1993-12-27 | 1993-12-27 | Charge / discharge circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3057992B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100907648B1 (en) * | 2002-08-30 | 2009-07-14 | 주식회사 포스코 | Capacitor Bank of Switching System |
| KR102601548B1 (en) * | 2021-06-08 | 2023-11-13 | 배수원 | tissue box |
-
1993
- 1993-12-27 JP JP5346910A patent/JP3057992B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100907648B1 (en) * | 2002-08-30 | 2009-07-14 | 주식회사 포스코 | Capacitor Bank of Switching System |
| KR102601548B1 (en) * | 2021-06-08 | 2023-11-13 | 배수원 | tissue box |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07194136A (en) | 1995-07-28 |
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