JPH0245432B2 - SOFUTO * SUTAATOHOSHIKI - Google Patents
SOFUTO * SUTAATOHOSHIKIInfo
- Publication number
- JPH0245432B2 JPH0245432B2 JP1728185A JP1728185A JPH0245432B2 JP H0245432 B2 JPH0245432 B2 JP H0245432B2 JP 1728185 A JP1728185 A JP 1728185A JP 1728185 A JP1728185 A JP 1728185A JP H0245432 B2 JPH0245432 B2 JP H0245432B2
- Authority
- JP
- Japan
- Prior art keywords
- soft start
- capacitor
- transformer
- resistor
- winding
- 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
- 239000003990 capacitor Substances 0.000 claims description 19
- 238000004804 winding Methods 0.000 claims description 16
- 238000009499 grossing Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 230000010355 oscillation Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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
- H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
- H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
- H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、自励発振形リンギング・チヨーク・
コンバータ電源のソフト・スタート方式に関する
ものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a self-oscillating ringing
This relates to a soft start method for converter power supplies.
自励発振形リンギング・チヨーク・コンバータ
電源は、一般に無負荷時に比べて、有負荷時では
発振周波数が極端に低くなる。定格負荷に比べペ
ーク負荷が大きくなるような場合、過電圧ポイン
トをピーク負荷時よりも更に高い点に設定する必
要があり、止むを得ず可聴周波数帯域内に発振周
波数が入る場合がある。この場合、電源投入時に
かなり強烈な発振音を伴うため、使用者に不快感
を与えることになる。
In a self-oscillating ringing-choke converter power supply, the oscillation frequency is generally extremely lower when loaded than when unloaded. If the peak load is larger than the rated load, it is necessary to set the overvoltage point to a point higher than the peak load, and the oscillation frequency may unavoidably fall within the audible frequency band. In this case, when the power is turned on, a fairly strong oscillation sound is generated, which causes discomfort to the user.
本発明は、上記の考察に基づくものであつて、
簡単な構成で電源投入時の発振音を極少に抑え得
るようになつた自励発振形リンギング・チヨー
ク・コンバータ電源のソフト・スタート方式を提
供することを目的としている。
The present invention is based on the above considerations, and includes:
The object of the present invention is to provide a soft start method for a self-excited oscillation ringing-choke converter power supply, which has a simple configuration and can minimize oscillation noise when the power is turned on.
そしてそのため本発明のソフト・スタート方式
は、変圧器と、該変圧器の１次巻線の下端にコレ
クタが接続されフイードバツク巻線の上端にエミ
ツタが接続されたスイツチング・トランジスタ
と、上記フイードバツク巻線に誘起する誘起電圧
が入力されると共にホト・カプラの受光素子の出
力が入力されこれらの入力に従い上記スイツチン
グ・トランジスタのベース電流を制御する制御回
路と、上記変圧器の２次巻線に接続された整流ダ
イオードと、該整流ダイオードの後段に設置され
た平滑コンデンサと、出力電圧と基準電圧とが入
力される演算増幅器と、正の２次側出力線と上記
演算増幅器の出力の間に設置されたホト・カプラ
の発光素子と、一端が負の２次側出力線に接続さ
れたソフト・スタート用コンデンサと、一端が上
記正の２次側出力線に接続され他端が上記ソフ
ト・スタート用コンデンサの他端に接続されたプ
ルアツプ抵抗と、上記ホト・カプラの発光素子と
上記ソフト・スタート用コンデンサの他端の間に
設置されたソフト・スタート用ダイオードとを具
備することを特徴とするものである。
Therefore, the soft start method of the present invention includes a transformer, a switching transistor whose collector is connected to the lower end of the primary winding of the transformer, and whose emitter is connected to the upper end of the feedback winding, and the feedback winding. A control circuit is connected to the control circuit which receives the induced voltage induced in the switching transistor and the output of the light receiving element of the photocoupler and controls the base current of the switching transistor according to these inputs, and the secondary winding of the transformer. a rectifier diode, a smoothing capacitor installed after the rectifier diode, an operational amplifier to which the output voltage and reference voltage are input, and an operational amplifier installed between the positive secondary output line and the output of the operational amplifier. A light emitting element of a photocoupler, a soft start capacitor with one end connected to the negative secondary output line, and a soft start capacitor with one end connected to the positive secondary output line and the other end for the soft start. A device characterized by comprising a pull-up resistor connected to the other end of the capacitor, and a soft start diode installed between the light emitting element of the photocoupler and the other end of the soft start capacitor. It is.
以下、本発明を図面を参照しつつ説明する。第
１図は本発明の１実施例のブロツク図である。第
１図において、１は起動抵抗、２はプルアツプ抵
抗、３はデイスチヤージ抵抗、４と５は電流制限
抵抗、６と７は分割抵抗、８はスイツチング・ト
ランジスタ、９は制御回路、１０は演算増幅器、
１１は整流ダイオード、１２はデイスチヤージ用
ダイオード、１３はソフト・スタート用ダイオー
ド、１５は平滑コンデンサ、１５はソフト・スタ
ート用コンデンサ、１６は基準電圧、１７はホ
ト・ダイオード、１８はホト・トランジスタ、２
０は変圧器、２１は変圧器の１次巻線、２２は２
次巻線、２３はフイードバツク巻線をそれぞれ示
している。
Hereinafter, the present invention will be explained with reference to the drawings. FIG. 1 is a block diagram of one embodiment of the present invention. In Figure 1, 1 is a starting resistor, 2 is a pull-up resistor, 3 is a discharge resistor, 4 and 5 are current limiting resistors, 6 and 7 are dividing resistors, 8 is a switching transistor, 9 is a control circuit, and 10 is an operational amplifier. ,
11 is a rectifier diode, 12 is a discharge diode, 13 is a soft start diode, 15 is a smoothing capacitor, 15 is a soft start capacitor, 16 is a reference voltage, 17 is a photodiode, 18 is a phototransistor, 2
0 is the transformer, 21 is the primary winding of the transformer, 22 is 2
The next winding 23 indicates a feedback winding.
制御回路９はトランジスタ８のベース電流を制
御するものである。ベース電流は、巻線２３の誘
起電圧に比例した値からホト・トランジスタ１８
の受光量に比例した値を減算して得られる値に比
例すると考えて良い。トランジスタ８がオンする
と、巻線２３に電圧が誘起し、この誘起電圧によ
つてベース電流が流れ、コレクタ電流は直線的に
増大し、或る値に達した後に急激に減少する。そ
してトランジスタ８がオフの期間、変圧器２０に
蓄積されている磁気エネルギーが負荷側に放出さ
れる。ホト・ダイオード１７とホト・トランジス
タ１８はホト・カプラを構成している。演算増幅
器１０は基準電圧と出力電圧とを比較し、基準電
圧より出力電圧が大きい時に負の出力を生ずる。
負の出力が生ずると、ホト・ダイオード１７が発
光する。 The control circuit 9 controls the base current of the transistor 8. The base current is determined from a value proportional to the induced voltage of the winding 23 to the phototransistor 18.
It can be considered that it is proportional to the value obtained by subtracting the value proportional to the amount of light received. When the transistor 8 is turned on, a voltage is induced in the winding 23, a base current flows due to this induced voltage, the collector current increases linearly, and after reaching a certain value, rapidly decreases. Then, while the transistor 8 is off, the magnetic energy stored in the transformer 20 is released to the load side. Photodiode 17 and phototransistor 18 constitute a photocoupler. Operational amplifier 10 compares a reference voltage and an output voltage, and produces a negative output when the output voltage is greater than the reference voltage.
When a negative output occurs, photodiode 17 emits light.
電源が投入されると、出力電圧V0が上昇状態
にある時、ホト・ダイオード１７、抵抗４、ダイ
オード１３を流れて来た電流と抵抗２を流れて来
た電流がコンデンサ１５をチヤージする。この
時、ホト・ダイオード１７の発光量が大きいと、
制御回路９は２次側へのエネルギー伝達を少なく
する方向、即ちトランジスタ８のオン幅を小さく
する方向に働く。コンデンサ１５の両端電圧は、
チヤージされているために少しずつ上昇してい
く。また、このときホト・ダイオード１７を流れ
る電流は略ぼ一定である。 When the power is turned on, the current flowing through the photodiode 17, the resistor 4, the diode 13, and the current flowing through the resistor 2 charges the capacitor 15 when the output voltage V0 is in a rising state. At this time, if the amount of light emitted from the photodiode 17 is large,
The control circuit 9 works in the direction of reducing energy transfer to the secondary side, that is, in the direction of reducing the ON width of the transistor 8. The voltage across the capacitor 15 is
It rises little by little because it is being charged. Further, at this time, the current flowing through the photodiode 17 is approximately constant.
出力電圧V0が定格値まで上昇すると、抵抗５
ないし７、演算増幅器１０、基準電圧１６で構成
された電圧安定化回路が作動し、ホト・ダイオー
ド１７に流れる電流は抵抗５を通り演算増幅器１
０へ流れ込んで出力電圧V0が安定化するように
働く。また、この時点から抵抗４、ダイオード１
３には電流が流れなくなり、コンデンサ１５は抵
抗２によつて出力電圧V0までプルアツプされる。
したがつて、出力電圧が安定化されている時、ダ
イオード１３は逆バイアスされた状態にある。電
源切断時は抵抗３、ダイオード１３を流れる電流
と抵抗２を流れる電流とにより、コンデンサ１５
の電荷は急速に負荷側へ放出される。上記のよう
なソフト・スタート回路（符号２，３，４，１
２，１３，１５の部分）の付加により、ダイナミ
ツク負荷変動特性の悪化、起動不能という現象は
全く生じない。 When the output voltage V 0 rises to the rated value, the resistor 5
or 7, the voltage stabilizing circuit composed of the operational amplifier 10 and the reference voltage 16 is activated, and the current flowing to the photodiode 17 passes through the resistor 5 and is applied to the operational amplifier 1.
0 and works to stabilize the output voltage V 0 . Also, from this point on, resistor 4, diode 1
No current flows through the capacitor 3, and the capacitor 15 is pulled up to the output voltage V0 by the resistor 2.
Therefore, when the output voltage is regulated, diode 13 is in a reverse biased state. When the power is turned off, the current flowing through the resistor 3 and diode 13 and the current flowing through the resistor 2 cause the capacitor 15 to
The charge is rapidly released to the load side. Soft start circuit as above (coded 2, 3, 4, 1
By adding the parts 2, 13, and 15), the phenomenon of deterioration of dynamic load fluctuation characteristics and inability to start occurs at all.
第２図は本発明の特性と従来例の特性とを示す
図である。第２図ａに示すように、電源投入され
ると、従来例では時間の経過と共に発振周波数は
徐々に増大し、発振音を伴う期間が長い。これに
対して、本発明では発振周波数が急激に増大し、
しかる後に減少し、発振音を伴う期間が従来例に
比べて短い。第２図ｂは出力電圧と時間との関係
を示す図である。第２図ｂから判るように、本発
明は従来例に比べ出力変圧は徐々に上昇する。 FIG. 2 is a diagram showing the characteristics of the present invention and the characteristics of the conventional example. As shown in FIG. 2a, in the conventional example, when the power is turned on, the oscillation frequency gradually increases over time, and the period accompanied by the oscillation sound is long. In contrast, in the present invention, the oscillation frequency increases rapidly,
It then decreases, and the period accompanied by the oscillating sound is shorter than in the conventional example. FIG. 2b is a diagram showing the relationship between output voltage and time. As can be seen from FIG. 2b, the output voltage of the present invention gradually increases compared to the conventional example.
以上の説明から明らかなように、本発明によれ
ば、自励発振形リンギング・チヨーク・コンバー
タ電源において電源投入時の発振音を小さくする
ことが出来る。
As is clear from the above description, according to the present invention, it is possible to reduce the oscillation noise when the power is turned on in a self-oscillation type ringing-choke converter power supply.
第１図は本発明の１実施例のブロツク図、第２
図は本発明の特性と従来例の特性とを示す図であ
る。
１…起動抵抗、２…プルアツプ抵抗、３…デイ
スチヤージ抵抗、４と５…電流制限抵抗、６と７
…分割抵抗、８…スイツチング・トランジスタ、
９…制御回路、１０…演算増幅器、１１…整流ダ
イオード、１２…デイスチヤージ用ダイオード、
１３…ソフト・スタート用ダイオード、１４…平
滑コンデンサ、１５…ソフト・スタート用コンデ
ンサ、１６…基準電圧、１７…ホト・ダイオー
ド、１８…ホト・トランジスタ、２０…変圧器、
２１…変圧器の１次巻線、２２…２次巻線、２３
…フイードバツク巻線。
FIG. 1 is a block diagram of one embodiment of the present invention, and FIG.
The figure is a diagram showing characteristics of the present invention and characteristics of a conventional example. 1...Starting resistor, 2...Pull-up resistor, 3...Discharge resistor, 4 and 5...Current limiting resistor, 6 and 7
...dividing resistor, 8...switching transistor,
9... Control circuit, 10... Operational amplifier, 11... Rectifier diode, 12... Discharge diode,
13... Diode for soft start, 14... Smoothing capacitor, 15... Capacitor for soft start, 16... Reference voltage, 17... Photo diode, 18... Photo transistor, 20... Transformer,
21... Primary winding of transformer, 22... Secondary winding, 23
...Feedback winding.
Claims (1)
クタが接続されたフイードバツク巻線の上端にエ
ミツタが接続されたスイツチング・トランジスタ
と、上記フイードバツク巻線に誘起する誘起電圧
が入力されると共にホト・カプラの受光素子の出
力が入力されこれらの入力に従い上記スイツチン
グ・トランジスタのベース電流を制御する制御回
路と、上記変圧器の２次巻線に接続された整流ダ
イオードと、該整流ダイオードの後段に設置され
た平滑コンデンサと、出力電圧と基準電圧とが入
力される演算増幅器と、正の２次側出力線と上記
演算増幅器の出力の間に設置されたホト・カプラ
の発光素子と、一端が負の２次側出力線に接続さ
れたソフト・スタート用コンデンサと、一端が上
記正の２次側出力線に接続され他端が上記ソフ
ト・スタート用コンデンサの他端に接続されたプ
ルアツプ抵抗と、上記ホト・カプラの発光素子と
上記ソフト・スタート用コンデンサの他端の間に
設置されたソフト・スタート用ダイオードとを具
備することを特徴とするソフト・スタート方式。1 A transformer, a switching transistor whose collector is connected to the lower end of the primary winding of the transformer, and whose emitter is connected to the upper end of the feedback winding, and the induced voltage induced in the feedback winding is inputted. and a control circuit which receives the output of the photo-receiving element of the photocoupler and controls the base current of the switching transistor according to these inputs, a rectifier diode connected to the secondary winding of the transformer, and a control circuit of the rectifier diode. A smoothing capacitor installed in the latter stage, an operational amplifier to which the output voltage and the reference voltage are input, a photocoupler light emitting element installed between the positive secondary output line and the output of the operational amplifier, A soft start capacitor with one end connected to the negative secondary output line, and a pull-up capacitor with one end connected to the positive secondary output line and the other end connected to the other end of the soft start capacitor. A soft start method comprising a resistor and a soft start diode installed between the light emitting element of the photocoupler and the other end of the soft start capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1728185A JPH0245432B2 (en) | 1985-01-31 | 1985-01-31 | SOFUTO * SUTAATOHOSHIKI |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1728185A JPH0245432B2 (en) | 1985-01-31 | 1985-01-31 | SOFUTO * SUTAATOHOSHIKI |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61177163A JPS61177163A (en) | 1986-08-08 |
| JPH0245432B2 true JPH0245432B2 (en) | 1990-10-09 |
Family
ID=11939591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1728185A Expired - Lifetime JPH0245432B2 (en) | 1985-01-31 | 1985-01-31 | SOFUTO * SUTAATOHOSHIKI |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0245432B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2845209B2 (en) * | 1996-08-23 | 1999-01-13 | 日本電気株式会社 | Piezoelectric transformer inverter, its control circuit and driving method |
| JP6136064B2 (en) * | 2013-02-21 | 2017-05-31 | サンケン電気株式会社 | Overshoot reduction circuit |
-
1985
- 1985-01-31 JP JP1728185A patent/JPH0245432B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61177163A (en) | 1986-08-08 |
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