JPH0363081U - - Google Patents
Info
- Publication number
- JPH0363081U JPH0363081U JP12300389U JP12300389U JPH0363081U JP H0363081 U JPH0363081 U JP H0363081U JP 12300389 U JP12300389 U JP 12300389U JP 12300389 U JP12300389 U JP 12300389U JP H0363081 U JPH0363081 U JP H0363081U
- Authority
- JP
- Japan
- Prior art keywords
- converter
- transistor
- output
- power supply
- switching power
- 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
- 238000001514 detection method Methods 0.000 claims description 6
- 239000003990 capacitor Substances 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Dc-Dc Converters (AREA)
Description
第１図は本考案の一実施例を示す回路図、第２
図は従来例を示す回路図である。
１，２……入力端子、３，４……出力端子、５
……コンバータ、１０……コンバータ起動停止回
路、１１，１２……トランジスタ、１３〜１６…
…抵抗、１７……ツエナーダイオード、２０……
不足電圧検出部、２１，３１……フオトカプラ、
２２，３２……コンデンサ、３０……過電圧検出
部。
Figure 1 is a circuit diagram showing one embodiment of the present invention;
The figure is a circuit diagram showing a conventional example. 1, 2...Input terminal, 3, 4...Output terminal, 5
...Converter, 10...Converter start/stop circuit, 11, 12...Transistor, 13-16...
...Resistor, 17... Zener diode, 20...
Undervoltage detection section, 21, 31... photocoupler,
22, 32... Capacitor, 30... Overvoltage detection section.
Claims (1)
少くとも不足電圧検出部を備え、前記コンバータ
の出力電圧不足を第１のフオトカプラの非導通状
態により前記コンバータの入力側のコンバータ起
動停止部へ通知して前記コンバータの出力を停止
させる構成のスイツチング電源回路において、 前記コンバータ起動停止部が、前記コンバータ
に起動信号を送出するフリツプフロツプ回路を形
成する二つのトランジスタと、この内の第１のト
ランジスタのベース端子と第２のトランジスタの
コレクタ端子との間に直列に挿入されたコンデン
サと、このコンデンサに並列接続されかつエミツ
タ端子を前記第２のトランジスタのコレクタ端子
に接続した前記不足電圧検出部のフオトカプラの
出力側トランジスタとを有することを特徴とする
スイツチング電源回路。 (2) 前記コンバータの出力側に過電圧検出部を
備え、前記コンバータの出力過電圧を第２のフオ
トカプラの導通状態により前記コンバータ起動停
止部へ通知して前記フリツプフロツプ回路の出力
反転により前記コンバータの出力を停止させるこ
とを特徴とする請求項(1)記載のスイツチング電
源回路。 (3) 前記第２のフオトカプラの出力側トランジ
スタは前記第１のトランジスタのコレクタ端子と
エミツタ端子との間に挿入され、かつ、前記第２
のトランジスタのコレクタ端子とエミツタ端子と
の間にはコンデンサが挿入されていることを特徴
とする請求項(2)記載のスイツチング電源回路。[Claims for Utility Model Registration] (1) At least an undervoltage detection unit is provided on the output side of a converter that converts direct current into voltage, and an undervoltage detection unit is provided at least on the output side of the converter, and the output voltage of the converter is detected by the non-conducting state of the first photocoupler. In the switching power supply circuit configured to stop the output of the converter by notifying a converter start/stop unit on the side, the converter start/stop unit includes two transistors forming a flip-flop circuit that sends a start signal to the converter; a capacitor inserted in series between the base terminal of the first transistor and the collector terminal of the second transistor; and a capacitor connected in parallel to this capacitor and having its emitter terminal connected to the collector terminal of the second transistor. and a transistor on the output side of the photocoupler of the undervoltage detection section. (2) An overvoltage detection section is provided on the output side of the converter, and the output overvoltage of the converter is notified to the converter start/stop section by the conduction state of the second photocoupler, and the output of the converter is controlled by inverting the output of the flip-flop circuit. 2. The switching power supply circuit according to claim 1, wherein the switching power supply circuit stops the switching power supply circuit. (3) The output side transistor of the second photocoupler is inserted between the collector terminal and the emitter terminal of the first transistor, and
3. The switching power supply circuit according to claim 2, wherein a capacitor is inserted between the collector terminal and the emitter terminal of the transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12300389U JPH0739345Y2 (en) | 1989-10-19 | 1989-10-19 | Switching power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12300389U JPH0739345Y2 (en) | 1989-10-19 | 1989-10-19 | Switching power supply circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0363081U true JPH0363081U (en) | 1991-06-20 |
| JPH0739345Y2 JPH0739345Y2 (en) | 1995-09-06 |
Family
ID=31670998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12300389U Expired - Lifetime JPH0739345Y2 (en) | 1989-10-19 | 1989-10-19 | Switching power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0739345Y2 (en) |
-
1989
- 1989-10-19 JP JP12300389U patent/JPH0739345Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0739345Y2 (en) | 1995-09-06 |