JPH0190289U - - Google Patents
Info
- Publication number
- JPH0190289U JPH0190289U JP18270487U JP18270487U JPH0190289U JP H0190289 U JPH0190289 U JP H0190289U JP 18270487 U JP18270487 U JP 18270487U JP 18270487 U JP18270487 U JP 18270487U JP H0190289 U JPH0190289 U JP H0190289U
- Authority
- JP
- Japan
- Prior art keywords
- terminal
- output
- positive
- zener diode
- negative
- 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.)
- Granted
Links
- 238000010586 diagram Methods 0.000 description 3
Description
第１図は本考案の一実施例を示す回路図、第２
図は本考案の一実施例を示す特性図、第３図は従
来のスイツチング電源の一例を示す回路図である
。
２……スイツチングトランス、２ａ……１次側
コイル、２ｂ１，２ｂ２，２ｂｎ……２次側コイ
ル、３……スイツチング素子、５……制御用オシ
レータ、７……定電圧回路、１０……ＰＮＰトラ
ンジスタ、１１……ホトカプラ、１３……第１の
ツエナーダイオード、１４……ＰＮＰトランジス
タ、１５……第２のツエナーダイオード。
Figure 1 is a circuit diagram showing one embodiment of the present invention;
The figure is a characteristic diagram showing an embodiment of the present invention, and FIG. 3 is a circuit diagram showing an example of a conventional switching power supply. 2... Switching transformer, 2a... Primary coil, 2b1, 2b2, 2bn... Secondary coil, 3... Switching element, 5... Control oscillator, 7... Constant voltage circuit, 10... PNP transistor, 11... Photocoupler, 13... First Zener diode, 14... PNP transistor, 15... Second Zener diode.
Claims (1)
チング素子を介して直流電力を供給し、このスイ
ツチング素子を制御用オシレータでオン・オフ比
制御し、前記スイツチングトランスの複数の２次
側コイルに交流出力を得るようにし、該２次側コ
イルの少なくとも２つの交流出力を整流し、その
整流した一方のプラス側をプラス端子に接続し、
そのマイナス側を他の直流出力のプラス側と共通
にし、共通端子に接続すると共にこの他の直流出
力のマイナス側をマイナス端子に接続し、前記プ
ラス出力端子の電圧を検出して定電圧回路に入力
し、該定電圧回路の出力で前記制御用オシレータ
を自動制御し、前記整流した直流出力電圧を安定
化させると共に、前記制御用オシレータに該オシ
レータの動作をロツクするロツク回路を設け、前
記直流出力電圧の過電圧時にホトカプラに過電圧
信号を入力し、該ホトカプラで前記ロツク回路を
制御し、該ロツク回路の出力信号で前記制御用オ
シレータをロツクするようにしたものにおいて、
前記プラス端子と共通端子間に第１のツエナーダ
イオードのカソードをプラス端子側にして接続す
ると共に、この第１のツエナーダイオードと並列
に該第１のツエナーダイオードが導通したときに
通流して前記ホトカプラおよび第２のダイオード
を介して共通端子に電流を流す第１のトランジス
タを接続してプラス電圧保護回路を形成し、かつ
前記共通端子とマイナス端子間に第２のツエナー
ダイオードが導通したときに通流して第１のダイ
オード及び前記ホトカプラを介してマイナス端子
に電流を流す第２のトランジスタを接続してマイ
ナス電圧保護回路を形成したことを特徴とするス
イツチング電源。 DC power is supplied to the primary coil of the switching transformer via a switching element, the on/off ratio of this switching element is controlled by a control oscillator, and AC output is sent to the plurality of secondary coils of the switching transformer. rectifying at least two alternating current outputs of the secondary coil, and connecting the positive side of the rectified one to the positive terminal,
Make the negative side common to the positive side of other DC outputs, connect to the common terminal, connect the negative side of this other DC output to the negative terminal, detect the voltage of the positive output terminal, and connect it to the constant voltage circuit. The control oscillator is automatically controlled by the output of the constant voltage circuit to stabilize the rectified DC output voltage, and the control oscillator is provided with a lock circuit for locking the operation of the oscillator. An overvoltage signal is input to a photocoupler when the output voltage is overvoltage, the photocoupler controls the lock circuit, and the output signal of the lock circuit locks the control oscillator,
A first Zener diode is connected between the positive terminal and the common terminal with the cathode of the first Zener diode on the positive terminal side, and when the first Zener diode conducts in parallel with the first Zener diode, current flows through the photocoupler. and a first transistor that allows current to flow through the common terminal via a second diode to form a positive voltage protection circuit, and a second Zener diode that conducts when the second Zener diode conducts between the common terminal and the negative terminal. A switching power supply characterized in that a negative voltage protection circuit is formed by connecting a second transistor that allows current to flow through the first diode and the negative terminal through the photocoupler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18270487U JPH066712Y2 (en) | 1987-11-30 | 1987-11-30 | Switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18270487U JPH066712Y2 (en) | 1987-11-30 | 1987-11-30 | Switching power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0190289U true JPH0190289U (en) | 1989-06-14 |
| JPH066712Y2 JPH066712Y2 (en) | 1994-02-16 |
Family
ID=31474148
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18270487U Expired - Lifetime JPH066712Y2 (en) | 1987-11-30 | 1987-11-30 | Switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH066712Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004527138A (en) * | 2001-05-25 | 2004-09-02 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | LED power supply |
-
1987
- 1987-11-30 JP JP18270487U patent/JPH066712Y2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004527138A (en) * | 2001-05-25 | 2004-09-02 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | LED power supply |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH066712Y2 (en) | 1994-02-16 |
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