JPH022387B2 - - Google Patents
Info
- Publication number
- JPH022387B2 JPH022387B2 JP20476481A JP20476481A JPH022387B2 JP H022387 B2 JPH022387 B2 JP H022387B2 JP 20476481 A JP20476481 A JP 20476481A JP 20476481 A JP20476481 A JP 20476481A JP H022387 B2 JPH022387 B2 JP H022387B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- thyristor
- output voltage
- diode
- fuse
- 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
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
- H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
- H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor And Converter Starters (AREA)
- Dc-Dc Converters (AREA)
Description
【発明の詳細な説明】
本発明は、直流電力をスイツチング素子のオ
ン、オフ動作で出力電圧が一定になるようにチヨ
ツピングして負荷に供給するチヨツパ装置の過電
圧保護回路に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an overvoltage protection circuit for a chopper device that chops and supplies DC power to a load so that the output voltage becomes constant by turning on and off a switching element.
過電圧保護機能を備えたチヨツパ装置の回路構
成の一例を第１図に示す。図において、１は３相
交流電力を直流電力に変換する３相整流ブリツジ
回路、２はこのブリツジ回路１の出力をチヨツピ
ングして負荷３に供給するスイツチング素子とし
てのトランジスタ、４は平滑用のリアクトル、５
は平滑用のコンデンサ、６はフライホイールダイ
オード、７はチヨツパ出力電圧、つまり負荷３の
端子間電圧Vpを検出する出力電圧検出回路で、
過電圧検出機能も兼ね備えている。８は前記トラ
ンジスタ２のベースにオン、オフ制御信号を付与
する制御回路で、前記出力電圧検出回路７の検出
信号を受けて前記トランジスタ２のオン、オフ比
率、つまりデユーテイーを制御し、出力電圧Vp
を一定とする機能を有する。９はツエナダイオー
ドで、その一端は前記トランジスタ２のベースに
接続され、他端は抵抗１０を介してトランジスタ
２が挿設された（−）側電路とは逆の（＋）側電
路に接続されている。このツエナダイオード９と
抵抗１０の直列回路は、トランジスタ２のベース
電流供給路となつており、ツエナダイオード９を
抵抗１０の接続点に前記制御回路８から負パルス
電圧が印加されたときトランジスタ２がオフする
ようになつている。 An example of the circuit configuration of a chopper device equipped with an overvoltage protection function is shown in FIG. In the figure, 1 is a three-phase rectifier bridge circuit that converts three-phase AC power into DC power, 2 is a transistor as a switching element that chops the output of this bridge circuit 1 and supplies it to a load 3, and 4 is a smoothing reactor. ,5
is a smoothing capacitor, 6 is a flywheel diode, 7 is an output voltage detection circuit that detects the chopper output voltage, that is, the voltage V p between the terminals of load 3,
It also has an overvoltage detection function. Reference numeral 8 denotes a control circuit that applies an on/off control signal to the base of the transistor 2, which receives the detection signal from the output voltage detection circuit 7, controls the on/off ratio, that is, the duty, of the transistor 2, and controls the output voltage V. p
It has the function of keeping constant. Reference numeral 9 denotes a Zener diode, one end of which is connected to the base of the transistor 2, and the other end connected via a resistor 10 to the (+) side circuit opposite to the (-) side circuit in which the transistor 2 is inserted. ing. This series circuit of the Zener diode 9 and the resistor 10 serves as a base current supply path for the transistor 2, and when a negative pulse voltage is applied from the control circuit 8 to the Zener diode 9 at the connection point of the resistor 10, the transistor 2 It's starting to turn off.
また、（＋）側電路の直流電源（３相整流ブリ
ツジ回路１）の近傍にはヒユーズ１１が挿設さ
れ、両電路間に接続されたサイリスタ１２、３相
ブリツジ回路１と共に閉回路を形成している。こ
の閉回路が過電圧保護回路の主体をなすものであ
つて、サイリスタ１２のゲートは、過電圧検出時
に点弧信号が付与されるように前記出力電圧検出
回路７に接続されている。 In addition, a fuse 11 is inserted near the DC power supply (3-phase rectifier bridge circuit 1) on the (+) side electrical circuit, and forms a closed circuit with the thyristor 12 and the 3-phase bridge circuit 1 connected between both electrical circuits. ing. This closed circuit constitutes the main body of the overvoltage protection circuit, and the gate of the thyristor 12 is connected to the output voltage detection circuit 7 so that an ignition signal is applied when an overvoltage is detected.
この種のチヨツパ装置においては、チヨツパ入
力電圧Viは第２図に示すように脈流電圧となる。
この電圧は、制御回路８からの制御信号によるト
ランジスタ２のオン、オフ動作、リアクトル４と
コンデンサ５の平滑作用、フライホイールダイオ
ード６の異常電圧吸収作用等により一定電圧Vp
となり（第３図参照）、負荷３に印加される。 In this type of chopper device, the chopper input voltage V i becomes a pulsating voltage as shown in FIG.
This voltage is maintained at a constant voltage V p due to the on/off operation of the transistor 2 according to the control signal from the control circuit 8, the smoothing action of the reactor 4 and the capacitor 5, the abnormal voltage absorption action of the flywheel diode 6, etc.
(see FIG. 3) and is applied to the load 3.
この電圧一定化の過程でトランジスタ２の制御
が不能となつて、出力電圧が上昇すると、出力電
圧検出回路７の過電圧検査値を越えた時点（ｂ
点）でサイリスタ１２に点弧信号が送出される。
この結果、サイリスタ１２がターンオンして電源
としての３相ブリツジ回路１の短絡回路が形成さ
れ、その過大電流によつてヒユーズ１１が溶断し
てチヨツパ入力が遮断される。即ち、過電圧保護
動作が行われたことになる。 During this process of voltage stabilization, the transistor 2 becomes uncontrollable and the output voltage increases.When the output voltage exceeds the overvoltage test value of the output voltage detection circuit 7 (b
An ignition signal is sent to the thyristor 12 at point ).
As a result, the thyristor 12 is turned on, forming a short circuit of the three-phase bridge circuit 1 as a power source, and the fuse 11 is blown by the excessive current, cutting off the chopper input. In other words, an overvoltage protection operation has been performed.
ところが、このように過電圧時にサイリスタ１
２をオンさせてヒユーズ１１を溶断し、入力を遮
断しても、チヨツパ回路のリアクトル４にエネル
ギーが蓄積されており、このエネルギーによりコ
ンデンサ５の電圧は第３図に示すようにサイリス
タ１２のターンオン後も上昇を続け、その後放電
する。その場合、放電路は負荷３だけであり、電
圧は漸減するので、負荷３に対して悪影響を及ぼ
し、故障発生の一因となる。 However, in the event of overvoltage, thyristor 1
Even if the fuse 11 is turned on and the input is cut off, energy is stored in the reactor 4 of the chopper circuit, and this energy causes the voltage of the capacitor 5 to turn on the thyristor 12 as shown in Figure 3. It continues to rise and then discharges. In that case, the only discharge path is the load 3, and the voltage gradually decreases, which has an adverse effect on the load 3 and becomes a cause of failure.
本発明は上記のような欠点を除去するためにな
されたもので、ヒユーズ溶断用のサイリスタを平
滑回路のエネルギー放出回路に兼用することによ
り、簡単な回路構成で、的確に過電圧保護を行い
得るチヨツパ装置の過電圧保護回路を提供するこ
とを目的とする。 The present invention has been made in order to eliminate the above-mentioned drawbacks, and by using a thyristor for blowing a fuse as an energy release circuit of a smoothing circuit, it is possible to provide accurate overvoltage protection with a simple circuit configuration. The purpose is to provide an overvoltage protection circuit for equipment.
以下、本発明を図示の実施例に基づいて詳細に
説明する。 Hereinafter, the present invention will be explained in detail based on illustrated embodiments.
第４図は本発明の一実施例を示すもので、ヒユ
ーズ１１及びサイリスタ１２により３相ブリツジ
回路１の短絡回路を形成し、過電圧時に出力電圧
検出回路７からサイリスタ１２に点弧信号を与え
てターンオンさせ、ヒユーズ１１を溶断させるこ
とは従来（第１図）と同様であるが、本実施例で
はサイリスタ１２と直列に逆流防止用のダイオー
ド１３を接続するとともに、そのサイリスタ１２
との接続点つまりサイリスタ１２のアノードを平
滑回路のコンデンサ５の（＋）端に接続する一
方、トランジスタ２にダイオード１４を逆並列接
続している。即ち、サイリスタ１２とダイオード
１４により平滑回路のエネルギー放出回路を構成
している。 FIG. 4 shows an embodiment of the present invention, in which a fuse 11 and a thyristor 12 form a short circuit of a three-phase bridge circuit 1, and an ignition signal is given to the thyristor 12 from the output voltage detection circuit 7 at the time of overvoltage. Turning on and blowing out the fuse 11 is the same as in the conventional method (FIG. 1), but in this embodiment, a diode 13 for preventing backflow is connected in series with the thyristor 12, and the thyristor 12 is
The connection point with the thyristor 12, that is, the anode of the thyristor 12, is connected to the (+) end of the capacitor 5 of the smoothing circuit, while a diode 14 is connected in antiparallel to the transistor 2. That is, the thyristor 12 and the diode 14 constitute an energy release circuit of the smoothing circuit.
このような回路構成とすると、第５図に示すよ
うにａ点を始点とする定電圧化の動作過程におい
てトランジスタ２が制御不能となつて過電圧が生
じた場合、出力電圧検出回路７の過電圧検出値を
越えたｂ点でサイリスタ１２に点弧信号が送出さ
れる。この結果、サイリスタ１２がターンオンし
て３相ブリツジ回路１の短絡回路が形成され、、
その過大な電流によりヒユーズ１１が溶断する。
同時に、平滑回路の蓄積エネルギーがサイリスタ
１２、ダイオード１４の回路に放出され、負荷３
にかかる電圧は急激に減少する。従つて、負荷３
に対する保護が確実になる。 With such a circuit configuration, when the transistor 2 becomes uncontrollable and an overvoltage occurs during the voltage constant operation process starting from point a as shown in FIG. 5, the output voltage detection circuit 7 detects the overvoltage. At point b, where the value is exceeded, a firing signal is sent to the thyristor 12. As a result, the thyristor 12 is turned on and a short circuit of the three-phase bridge circuit 1 is formed.
The excessive current causes the fuse 11 to melt.
At the same time, the energy stored in the smoothing circuit is released to the circuit of the thyristor 12 and diode 14, and the load 3
The voltage applied to it decreases rapidly. Therefore, load 3
protection against is ensured.
以上のように本発明によれば、直流電力をスイ
ツチング素子のオン、オフ動作でチヨツピング
し、これを平滑して負荷に供給するチヨツパ装置
の直流入力端の短絡回路を形成し、過電圧時にヒ
ユーズを溶断させるサイリスタに平滑回路の蓄積
エネルギーの放出回路を兼ねさせたので、２個の
ダイオードを回路素子として追加しただけの簡単
な回路構成でありながら、過電圧時にはヒユーズ
の溶断に併せて平滑回路のエネルギーを速やかに
放出することができ、過電圧保護が適確となる。 As described above, according to the present invention, a short circuit is formed at the DC input end of the chopper device that chops DC power by turning on and off the switching element, smoothes it, and supplies it to the load, and disconnects the fuse in the event of an overvoltage. The thyristor that blows out also serves as a release circuit for the energy stored in the smoothing circuit, so even though the circuit configuration is simple, just adding two diodes as circuit elements, when the fuse blows out, the energy in the smoothing circuit is released in the event of an overvoltage. can be discharged quickly, ensuring accurate overvoltage protection.
第１図は従来のチヨツパ装置の過電圧保護回路
の一例を示す回路図、第２図はチヨツパ入力電圧
の波形図、第３図は従来回路における出力電圧の
波形図、第４図は本発明に係るチヨツパ装置の過
電圧保護回路の一実施例を示す回路図、第５図は
同実施例における出力電圧の波形図である。
１……３相整流ブリツジ回路、２……トランジ
スタ、３……負荷、４……平滑リアクトル、５…
…平滑コンデンサ、６……フライホイールダイオ
ード、７……出力電圧検出回路、８……制御回
路、９……ツエナダイオード、１０……抵抗、１
１……ヒユーズ、１２……サイリスタ、１３……
逆流防止用ダイオード、１４……ダイオード。
Fig. 1 is a circuit diagram showing an example of an overvoltage protection circuit of a conventional chopper device, Fig. 2 is a waveform diagram of the chopper input voltage, Fig. 3 is a waveform diagram of the output voltage in the conventional circuit, and Fig. 4 is a diagram showing the waveform of the chopper input voltage. FIG. 5 is a circuit diagram showing one embodiment of the overvoltage protection circuit of such a chopper device, and FIG. 5 is a waveform diagram of the output voltage in the same embodiment. 1... Three-phase rectifier bridge circuit, 2... Transistor, 3... Load, 4... Smoothing reactor, 5...
... Smoothing capacitor, 6 ... Flywheel diode, 7 ... Output voltage detection circuit, 8 ... Control circuit, 9 ... Zena diode, 10 ... Resistor, 1
1... Fuse, 12... Thyristor, 13...
Backflow prevention diode, 14... diode.
Claims (1)
作でチヨツピングし、リアクトル及びコンデンサ
で平滑して負荷に供給するとともに、出力電圧検
出回路の検出出力により出力電圧が一定となるよ
うに前記スイツチング素子のデユーテイを制御す
るチヨツパ装置において、直流電源近傍の電路に
ヒユーズを挿設するとともに、過電圧時に前記出
力電圧検出回路から点弧信号を受けてターンオン
するサイリスタと逆流防止用ダイオードの直列回
路を前記直流電源、ヒユーズと共に閉回路を構成
するよう（＋）（−）電路間に接続し、そのサイ
リスタとダイオードの接続点を前記平滑用のコン
デンサの（＋）端に接続する一方、前記スイツチ
ング素子にダイオードを逆並列接続したことを特
徴とするチヨツパ装置の過電圧保護回路。1 DC power is stepped by the on/off operation of the switching element, smoothed by a reactor and capacitor, and supplied to the load, and the duty of the switching element is adjusted so that the output voltage is constant based on the detection output of the output voltage detection circuit. In the chopper device to be controlled, a fuse is inserted in the electrical circuit near the DC power supply, and a series circuit of a thyristor and a reverse current prevention diode, which turns on when receiving an ignition signal from the output voltage detection circuit in the event of an overvoltage, is connected to the DC power supply and the fuse. The connection point between the thyristor and the diode is connected to the (+) end of the smoothing capacitor, while the diode is connected in anti-parallel to the switching element. An overvoltage protection circuit for a chopping device characterized by a connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20476481A JPS58107069A (en) | 1981-12-18 | 1981-12-18 | Overvoltage protective circuit for chopper device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20476481A JPS58107069A (en) | 1981-12-18 | 1981-12-18 | Overvoltage protective circuit for chopper device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58107069A JPS58107069A (en) | 1983-06-25 |
| JPH022387B2 true JPH022387B2 (en) | 1990-01-17 |
Family
ID=16495953
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20476481A Granted JPS58107069A (en) | 1981-12-18 | 1981-12-18 | Overvoltage protective circuit for chopper device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58107069A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006021256A1 (en) | 2006-04-28 | 2007-11-08 | Danfoss Compressors Gmbh | Motor start circuit |
| DE102006034499A1 (en) | 2006-07-19 | 2008-01-31 | Danfoss Compressors Gmbh | Motor start circuit |
| DE102006053524B4 (en) | 2006-11-07 | 2011-05-26 | Danfoss Flensburg Gmbh | Motor start circuit |
-
1981
- 1981-12-18 JP JP20476481A patent/JPS58107069A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58107069A (en) | 1983-06-25 |
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