JPH066719Y2 - Self-excited AC generator with automatic voltage adjustment function - Google Patents
Self-excited AC generator with automatic voltage adjustment functionInfo
- Publication number
- JPH066719Y2 JPH066719Y2 JP4568388U JP4568388U JPH066719Y2 JP H066719 Y2 JPH066719 Y2 JP H066719Y2 JP 4568388 U JP4568388 U JP 4568388U JP 4568388 U JP4568388 U JP 4568388U JP H066719 Y2 JPH066719 Y2 JP H066719Y2
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- winding
- excited
- control transistor
- self
- 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 - Lifetime
Links
- 238000004804 winding Methods 0.000 claims description 24
- 239000003990 capacitor Substances 0.000 claims description 17
- 238000009499 grossing Methods 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 9
- 230000005284 excitation Effects 0.000 claims description 8
- 230000002265 prevention Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 4
- 230000006378 damage Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
Landscapes
- Control Of Eletrric Generators (AREA)
Description
【考案の詳細な説明】 （産業上の利用分野） 本考案は自動電圧調整機能を備えた自励式交流発電機、
特に界磁電流制御用トランジスタの破損防止に関するも
のである。[Detailed Description of the Invention] (Industrial Application Field) The present invention is a self-excited AC generator with an automatic voltage adjustment function,
In particular, it relates to prevention of damage to the field current control transistor.
（従来技術） 自動電圧調整機能を備えた自励式交流発電機として、従
来次のような回路をもつものが広く使用されている。こ
の回路は第１図に示すようにエンジンなどによる始動時
の交流発電機Ｇの励磁巻線ＥＣにより検出された残留電
圧を、全波整流回路ＲＥＣ１とコンデンサＣ１により整
流平滑したものを界磁電流制御用トランジスタＱ１を介
して界磁巻線ＦＣに接続する。一方、電機子巻線ＭＣま
たはその一部を分割して作られた検出巻線ＳＣからの出
力電圧を、全波整流回路ＲＥＣ２とコンデンサＣ２によ
り整流平滑したものを、設定出力電圧と比較する誤差検
出回路ＥＶに加え、その出力電圧により副制御トランジ
スタＱ２を介して前記界磁電流制御用トランジスタＱ１
を、出力電圧低下時には界磁電流を増加し、また出力電
圧の上昇時には界磁電流を低下するようにスイッチング
制御して、電機子巻線ＭＣから一定出力電圧を得んとす
るものである。(Prior Art) As a self-excited AC generator having an automatic voltage adjusting function, one having a circuit as described below has been widely used. As shown in FIG. 1, this circuit is a full-wave rectifier circuit REC 1 and a capacitor C 1 which are rectified and smoothed from the residual voltage detected by the excitation winding EC of the AC generator G when the engine is started. It is connected to the field winding FC via the magnetic current controlling transistor Q 1 . On the other hand, the output voltage from the detection winding SC formed by dividing the armature winding MC or a part thereof is rectified and smoothed by the full-wave rectifier circuit REC 2 and the capacitor C 2 and compared with the set output voltage. to error detection circuit in addition to EV, the field current control transistor Q 1 via the sub-control transistor Q 2 by an output voltage
In order to obtain a constant output voltage from the armature winding MC, switching control is performed such that the field current is increased when the output voltage is decreased and the field current is decreased when the output voltage is increased.
（問題点） しかしこの回路では電機子巻線ＭＣに接続された負荷Ｒ
Ｌが短絡または過負荷となって電機子巻線ＭＣ又は検出
巻線ＳＣの出力電圧が低下すると、誤差検出回路ＥＶの
入力電圧も低下する。このため、界磁電流制御用トラン
ジスタＱ１の導通度を深くして界磁電流の増加を図って
出力電圧を上昇するように働く。従って常時においては
第３図図中(a)曲線のように、少ないリップルであった
整流平滑回路ＲＦ１の出力電圧のリップルは、第３図中
の(b)曲線のように著しく大きなものとなり、これに伴
い最高と最低電圧の差は極めて大きなものとなる。この
ため整流平滑電圧がリップルの谷点に向かって低下する
に伴い、ベース電流供給用抵抗Ｒ１を介して流されるベ
ース電流の不足を生じて、界磁電流制御用トランジスタ
Ｑ１の不飽和状態を招き、これを破壊させるおそれがあ
る。(Problem) However, in this circuit, the load R connected to the armature winding MC
When L is short-circuited or overloaded and the output voltage of the armature winding MC or the detection winding SC drops, the input voltage of the error detection circuit EV also drops. Therefore, the field current control transistor Q 1 is made deeper to increase the field current, thereby increasing the output voltage. Therefore, the ripple of the output voltage of the rectifying / smoothing circuit RF 1 , which has a small ripple as shown by the curve (a) in FIG. 3 at all times, becomes remarkably large as shown by the curve (b) in FIG. As a result, the difference between the highest voltage and the lowest voltage becomes extremely large. For this reason, as the rectified and smoothed voltage decreases toward the valley of the ripple, a shortage of the base current flowing through the base current supply resistor R 1 occurs, and the field current control transistor Q 1 is in an unsaturated state. There is a risk that this may be destroyed.
（考案の目的） 本考案は上記のような不飽和によるトランジスタの破壊
の防止を目的とするものである。(Purpose of Invention) The present invention is intended to prevent the destruction of the transistor due to the above-mentioned unsaturation.
（問題点を解決するための本考案の手段） 本考案の特徴とするところは、放電阻止用ダイオードを
介して、励磁巻線電圧の整流平滑電圧により充電される
界磁電流補償用コンデンサを設けて、ベース電流を供給
すると共に、整流平滑電圧の低下時には界磁電流補償用
コンデンサの充電電荷によってもベース電流が供給され
るようにして、負荷短絡時などにおけるベースバイアス
の不足を補って不飽和による界磁電流制御用トランジス
タの破壊を防止したものである。次に本考案の詳細を実
施例により説明する。(Means of the Present Invention for Solving Problems) The feature of the present invention is that a field current compensation capacitor is provided which is charged by the rectified and smoothed voltage of the excitation winding voltage via a discharge blocking diode. The base current is supplied by the charge of the field current compensating capacitor when the rectified and smoothed voltage drops and the base bias is supplied when the load is short-circuited, resulting in unsaturation. It is intended to prevent the field current control transistor from being damaged by. Next, details of the present invention will be described by way of examples.
（実施例の構成） 第２図は本考案の一実施例回路図である。図において、
Ｇは自励式交流発電機、ＥＣは励磁巻線、ＦＣは界磁巻
線、Ｄ１はフライホイールダイオード、ＭＣは電機子巻
線（電機子巻線の一部を分割して作られた検出巻線ＳＣ
を用いることができる）、ＲＬは負荷、ＲＥＣ１は全波
整流回路、Ｃ１は平滑用コンデンサ、Ｑ２は副制御用ト
ランジスタ、Ｑ１は界磁電流制御用トランジスタ、ＲＥ
Ｃ２は全波整流回路、Ｃ２は平滑用コンデンサ、ＥＶは
誤差検出回路、Ｒ１はベース電流供給用抵抗であって、
以上の各部による回路構成は従来回路を示す第１図と同
様である。(Structure of Embodiment) FIG. 2 is a circuit diagram of an embodiment of the present invention. In the figure,
G is a self-excited AC generator, EC is an excitation winding, FC is a field winding, D 1 is a flywheel diode, MC is an armature winding (a detection made by dividing a part of the armature winding). Winding SC
, RL is a load, REC 1 is a full-wave rectifier circuit, C 1 is a smoothing capacitor, Q 2 is a sub-control transistor, Q 1 is a field current control transistor, RE
C 2 is a full-wave rectification circuit, C 2 is a smoothing capacitor, EV is an error detection circuit, R 1 is a base current supply resistor,
The circuit configuration of each of the above components is similar to that of FIG.
次にＤ２は放電阻止用ダイオード、Ｃ３はベース電流補
償用コンデンサであって、これらで本考案の要部回路を
形成し、ダイオードＤ２は励磁巻線ＥＣの整流平滑電圧
によりベース電流を流しうるように、ベース電流供給用
抵抗Ｒ１を介して界磁電流制御用トランジスタＱ１のベ
ースに接続される。またコンデンサＣ３は平滑用コンデ
ンサＣ１の負極端と、上記ダイオードＤ２と抵抗Ｒ１の
接続点間に接続される。Next, D 2 is a discharge blocking diode and C 3 is a base current compensation capacitor, which form the main circuit of the present invention. The diode D 2 supplies the base current by the rectified and smoothed voltage of the excitation winding EC. In order to allow the current to flow, it is connected to the base of the field current control transistor Q 1 via the base current supply resistor R 1 . The capacitor C 3 is connected between the negative terminal of the smoothing capacitor C 1 and the connection point between the diode D 2 and the resistor R 1 .
（作用） ベース電流補償用コンデンサＣ３は、放電阻止用ダイオ
ードＤ２を介して励磁巻線ＥＣの整流平滑電圧まで常時
充電されている。そこで負荷ＲＬの短絡を生じて整流平
滑電圧のリップルが第３図中の(b)のように大きくな
り、第２図のＡ点の電圧がリップルの谷点に向かって低
下してコンデンサＣ３の充電電圧より低下すると、その
電位差にもとづきコンデンサＣ３の充電電荷は抵抗Ｒ１
を介して放電して整流平滑電圧の低下に伴うベースバイ
アスの不足を補って第３図中の曲線(c)のように平滑化
する。従って負荷ＲＬの短絡時などにおいて界磁電流制
御用トランジスタＱ１が不飽和の状態となるのを避ける
ことができ、破壊から免れることができる。(Operation) The base current compensating capacitor C 3 is constantly charged to the rectified and smoothed voltage of the excitation winding EC via the discharge blocking diode D 2 . Then, the load RL is short-circuited and the ripple of the rectified and smoothed voltage becomes large as shown in (b) of FIG. 3, and the voltage at point A in FIG. 2 decreases toward the valley point of the ripple and the capacitor C 3 If lower than the charging voltage, the charging electric charge of the capacitor C 3 based on the potential difference resistor R 1
The base bias is discharged due to a decrease in the rectified and smoothed voltage, and smoothing is performed as shown by a curve (c) in FIG. Therefore, it is possible to prevent the field current control transistor Q 1 from being in an unsaturated state when the load RL is short-circuited or the like, and it is possible to avoid destruction.
（他の実施例） 以上においては界磁電流制御用トランジスタＱ１に代え
て、第４図に示すようにモス電界効果型トランジスタ
（ＭＯＳ ＦＥＴ）を用いた場合にも適用して同様に破
壊を防ぎうる。(Other Embodiments) In the above, the field current control transistor Q 1 is replaced with a moss field effect transistor (MOS FET) as shown in FIG. Can be prevented.
（考案の効果） 以上のように本考案によれば負荷短絡時や過負荷時にお
ける界磁電流制御用トランジスタの不飽和による破壊の
おそれをなくすことができる。(Effect of the Invention) As described above, according to the present invention, it is possible to eliminate the risk of destruction of the field current control transistor due to unsaturation when the load is short-circuited or overloaded.
第１図は従来の回路図、第２図は本考案の一実施例回路
図、第３図は励磁巻線の整流平滑電圧を示す図、第４図
は本考案の他の実施例回路図である。 Ｇ……自励式交流発電機、ＥＣ……励磁巻線、ＦＣ……
界磁巻線、ＭＣ……電機子巻線、ＲＬ……負荷、ＲＥＣ
１……全波整流回路、Ｃ１……平滑用コンデンサ、Ｑ２
……副制御用トランジスタ、Ｑ１……界磁電流制御用ト
ランジスタ、ＲＥＣ２……全波整流回路、Ｃ２……平滑
用コンデンサ、ＥＶ……誤差検出回路、Ｒ１……ベース
電流供給用抵抗、Ｄ２……放電阻止用ダイオード、Ｃ３
……ベース電流補償用コンデンサ。FIG. 1 is a conventional circuit diagram, FIG. 2 is a circuit diagram of an embodiment of the present invention, FIG. 3 is a diagram showing a rectified and smoothed voltage of an excitation winding, and FIG. 4 is a circuit diagram of another embodiment of the present invention. Is. G ... Self-excited AC generator, EC ... Excitation winding, FC ...
Field winding, MC ... Armature winding, RL ... Load, REC
1 ... Full wave rectifier circuit, C 1 ... Smoothing capacitor, Q 2
…… Sub-control transistor, Q 1 …… Field current control transistor, REC 2 …… Full wave rectifier circuit, C 2 …… Smoothing capacitor, EV …… Error detection circuit, R 1 …… Base current supply Resistor, D 2 ... Discharge blocking diode, C 3
…… Base current compensation capacitor.
Claims (1)
御用トランジスタを介して界磁巻線に加えると共に、電
機子巻線出力又は検出巻線の整流平滑電圧を設定出力電
圧と比較する誤差検出回路の出力により前記界磁電流制
御用トランジスタを制御して電機子巻線の出力電圧を一
定化制御する自動電圧調整機能を備えた自励式交流発電
機において、前記励磁巻線出力の整流平滑回路の出力端
に放電阻止用ダイオードを介してベース電流補償用コン
デンサを接続し、放電阻止用ダイオードとベース電流補
償用コンデンサ接続点と界磁電流制御用トランジスタの
制御極間に抵抗を接続してベース電流を供給するように
したことを特徴とする自動電圧調整機能を備えた自励式
交流発電機。1. A rectifying / smoothing voltage of an excitation winding output is applied to the field winding through a field current control transistor, and a rectifying / smoothing voltage of an armature winding output or a detection winding is compared with a set output voltage. In the self-excited AC generator having an automatic voltage adjusting function for controlling the field current control transistor by the output of the error detection circuit to control the output voltage of the armature winding to be constant, Connect a base current compensation capacitor to the output terminal of the rectifying / smoothing circuit via a discharge prevention diode, and connect a resistor between the discharge prevention diode and the base current compensation capacitor connection point and the control pole of the field current control transistor. A self-excited AC generator equipped with an automatic voltage adjustment function, which is characterized by supplying a base current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4568388U JPH066719Y2 (en) | 1988-04-06 | 1988-04-06 | Self-excited AC generator with automatic voltage adjustment function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4568388U JPH066719Y2 (en) | 1988-04-06 | 1988-04-06 | Self-excited AC generator with automatic voltage adjustment function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01150500U JPH01150500U (en) | 1989-10-18 |
| JPH066719Y2 true JPH066719Y2 (en) | 1994-02-16 |
Family
ID=31271986
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4568388U Expired - Lifetime JPH066719Y2 (en) | 1988-04-06 | 1988-04-06 | Self-excited AC generator with automatic voltage adjustment function |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH066719Y2 (en) |
-
1988
- 1988-04-06 JP JP4568388U patent/JPH066719Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01150500U (en) | 1989-10-18 |
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