JPH0391079U - - Google Patents
Info
- Publication number
- JPH0391079U JPH0391079U JP15082989U JP15082989U JPH0391079U JP H0391079 U JPH0391079 U JP H0391079U JP 15082989 U JP15082989 U JP 15082989U JP 15082989 U JP15082989 U JP 15082989U JP H0391079 U JPH0391079 U JP H0391079U
- Authority
- JP
- Japan
- Prior art keywords
- base
- winding
- circuit
- voltage
- supply 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.)
- Pending
Links
- 238000004804 winding Methods 0.000 claims description 16
- 239000003990 capacitor Substances 0.000 claims description 3
- 230000002159 abnormal effect Effects 0.000 claims 3
- 238000001514 detection method Methods 0.000 claims 3
- 230000001681 protective effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Dc-Dc Converters (AREA)
Description
第１図は本考案の一実施例を示すスイツチング
電源回路の要部電気回路図である。
１……入力端子、２……変圧器、３，２０……
トランジスタ、４，５，１４，１８，１９……抵
抗器、６，７，８……巻線、９，１１……溶断素
子、１０，２２……ダイオード、１２，２１……
コンデンサ、１３……ツエナダイオード、１５…
…フオトカプラ、１６……発光ダイオード、１７
……フオトトランジスタ。
FIG. 1 is an electrical circuit diagram of a main part of a switching power supply circuit showing an embodiment of the present invention. 1...Input terminal, 2...Transformer, 3, 20...
Transistor, 4, 5, 14, 18, 19... Resistor, 6, 7, 8... Winding wire, 9, 11... Fusing element, 10, 22... Diode, 12, 21...
Capacitor, 13...Zena diode, 15...
...Photocoupler, 16...Light-emitting diode, 17
...Phototransistor.
補正 平２．４．１９ 図面の簡単な説明を次のように補正する。Correction 2.4.19. The brief description of the drawing has been amended as follows.
【図面の簡単な説明】
第１図は本考案の一実施例を示すスイツチング
電源回路の要部電気回路図、第２図は従来のスイ
ツチング電源回路の要部電気回路図である。
１……入力端子、２……変圧器、３，２０……
トランジスタ、４，５，１４，１８，１９……抵
抗器、６，７，８……巻線、９，１１……溶断素
子、１０，２２……ダイオード、１２，２１……
コンデンサ、１３……ツエナダイオード、１５…
…フオトカプラ、１６……発光ダイオード、１７
……フオトトランジスタ。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an electrical circuit diagram of a main part of a switching power supply circuit showing an embodiment of the present invention, and FIG. 2 is an electrical circuit diagram of a main part of a conventional switching power supply circuit. 1...Input terminal, 2...Transformer, 3, 20...
Transistor, 4, 5, 14, 18, 19... Resistor, 6, 7, 8... Winding wire, 9, 11... Fusing element, 10, 22... Diode, 12, 21...
Capacitor, 13...Zena diode, 15...
...Photocoupler, 16...Light-emitting diode, 17
...Phototransistor.
Claims (1)
グ動作の正帰還用のベース巻線を設け、前記１次
巻線の一端を分岐させて同分岐させた一方を第一
入力端子と接続し同分岐させた他方を起動用抵抗
器を介してスイツチングトランジスタのベースに
接続し、前記１次巻線の他端を同トランジスタの
コレクタに接続して、前記ベース巻線の一端をバ
イアス用抵抗器を介して前記トランジスタのベー
スに接続し、前記ベース巻線の他端を分岐させて
同分岐させた一方を第二入力端子に接続し同分岐
させた他方を前記トランジスタのエミツタに接続
し、前記両入力端子間に直流電圧を入力して前記
２次巻線より出力を取り出して整流して直流電圧
に変換して負荷回路に直流電圧を供給しているス
イツチング電源回路において、前記直流電圧の供
給回路に所定直流電圧以上の異常電圧検出手段を
設け、前記ベース巻線の一端とバイアス用抵抗器
の間に溶断素子を挿入して同溶断素子と同バイア
ス用抵抗器の接続点に同溶断素子の遮断手段の一
端を接続し、同遮断手段の他端と前記ベース巻線
の他端とを接続し、前記異常電圧検出手段により
検出された信号を前記遮断手段に結合して同遮断
手段を動作させ、前記溶断素子を遮断せしめてス
イツチング動作の正帰還回路を切断することを特
徴とするスイツチング電源回路。 (2) 前記異常電圧検出手段が直列に接続したツ
エナダイオードとダイオードの保護用抵抗器と発
光ダイオードからなり、同ツエナダイオードのカ
ソード側を前記直流電圧の供給回路に接続し、同
発光ダイオードのカソード側をアースに接続した
ことを特徴とする請求項(1)記載のスイツチング
電源回路。 (3) 前記遮断手段が前記溶断素子とバイアス用
抵抗器の接続点にダイオードのアノードを接続し
、同ダイオードのカソードと一方を前記ベース巻
線の他端に接続したコンデンサの他方とを接続し
てベース巻線に発生する出力を直流電圧に変換す
る回路と、同回路により変換された直流電圧をト
ランジスタのエミツタとベース間がバイアス用抵
抗器でブリツジされている同トランジスタのエミ
ツタに加え、同トランジスタのベースを負荷用抵
抗器を介してフオトトランジスタのコレクタと接
続し、同フオトトランジスタのエミツタと前記ト
ランジスタのコレクタをともに前記ベース巻線の
他端に接続した遮断回路からなることを特徴とす
る請求項(1)記載のスイツチング電源回路。[Claims for Utility Model Registration] (1) A transformer is provided with a primary winding, a secondary winding, and a base winding for positive feedback of switching operation, and one end of the primary winding is branched to form the same branch. One end of the primary winding is connected to the first input terminal, the other end of the branch is connected to the base of the switching transistor via a starting resistor, and the other end of the primary winding is connected to the collector of the transistor. , one end of the base winding is connected to the base of the transistor via a bias resistor, the other end of the base winding is branched, and one of the branched ends is connected to a second input terminal to make the same branch. The other end is connected to the emitter of the transistor, a DC voltage is input between both input terminals, the output is taken out from the secondary winding, rectified and converted to DC voltage, and the DC voltage is supplied to the load circuit. In the switching power supply circuit, the DC voltage supply circuit is provided with an abnormal voltage detection means of a predetermined DC voltage or higher, and a fusing element is inserted between one end of the base winding and the bias resistor. One end of the cutoff means of the fusing element is connected to the connection point of the bias resistor, and the other end of the cutoff means is connected to the other end of the base winding, and the signal detected by the abnormal voltage detection means is A switching power supply circuit characterized in that the circuit is coupled to the cutoff means to operate the cutoff means to cut off the fusing element and cut off the positive feedback circuit of the switching operation. (2) The abnormal voltage detection means includes a Zener diode connected in series, a protective resistor for the diode, and a light emitting diode, the cathode side of the Zener diode is connected to the DC voltage supply circuit, and the cathode side of the light emitting diode is connected to the DC voltage supply circuit. 2. The switching power supply circuit according to claim 1, wherein the switching power supply circuit has one end connected to ground. (3) The cutoff means connects the anode of a diode to the connection point between the fusing element and the bias resistor, and connects the cathode of the diode to the other end of the capacitor, one end of which is connected to the other end of the base winding. A circuit that converts the output generated in the base winding into a DC voltage, and a circuit that applies the DC voltage converted by the circuit to the emitter of the transistor whose emitter and base are bridged with a bias resistor. The circuit is characterized in that it consists of a cutoff circuit in which the base of a transistor is connected to the collector of a phototransistor via a load resistor, and the emitter of the phototransistor and the collector of the transistor are both connected to the other end of the base winding. A switching power supply circuit according to claim (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15082989U JPH0391079U (en) | 1989-12-28 | 1989-12-28 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15082989U JPH0391079U (en) | 1989-12-28 | 1989-12-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0391079U true JPH0391079U (en) | 1991-09-17 |
Family
ID=31697161
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15082989U Pending JPH0391079U (en) | 1989-12-28 | 1989-12-28 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0391079U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009196590A (en) * | 2008-02-25 | 2009-09-03 | Yoshiaki Shirowachi | Car wash brush |
-
1989
- 1989-12-28 JP JP15082989U patent/JPH0391079U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009196590A (en) * | 2008-02-25 | 2009-09-03 | Yoshiaki Shirowachi | Car wash brush |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4939632A (en) | Power supply circuit | |
| US5029061A (en) | Emergency lighting system | |
| JPH0391079U (en) | ||
| US20020080626A1 (en) | Switched mode power supply with a device for limiting the output voltage | |
| US5295185A (en) | Ringing signal generation circuit with protection against overvoltage | |
| CN219833757U (en) | Power supply self-driving protection circuit for security camera shooting and security camera shooting device | |
| JP2656148B2 (en) | Switching power supply with overcurrent protection circuit | |
| JPH0715348Y2 (en) | Stabilized power supply circuit | |
| JPH0291435U (en) | ||
| JPH0417687U (en) | ||
| JPS57143622A (en) | Switching regulator | |
| JPS6126965Y2 (en) | ||
| JPH0637598Y2 (en) | Fluorescent lamp lighting circuit | |
| JPS6434888U (en) | ||
| JPS583132Y2 (en) | power circuit | |
| CZ384192A3 (en) | Circuit arrangement of current-fed blocking oscillator | |
| JPH0482712U (en) | ||
| RU93042883A (en) | TWO-STATE ADJUSTABLE CONVERTER | |
| JPH05284740A (en) | Dc power circuit | |
| JPS62178787U (en) | ||
| JPH0391025U (en) | ||
| JPS63117288U (en) | ||
| JPS61180558U (en) | ||
| JPS60133652U (en) | photo coupler | |
| JPS63160089U (en) |