JPH0249332U - - Google Patents
Info
- Publication number
- JPH0249332U JPH0249332U JP12631888U JP12631888U JPH0249332U JP H0249332 U JPH0249332 U JP H0249332U JP 12631888 U JP12631888 U JP 12631888U JP 12631888 U JP12631888 U JP 12631888U JP H0249332 U JPH0249332 U JP H0249332U
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- supply circuit
- transformer
- switching transistor
- voltage
- 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
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Emergency Protection Circuit Devices (AREA)
- Protection Of Static Devices (AREA)
- 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
図は従来の電源回路の一例を示す回路図である。
1……AC整流回路、4,16……ヒユーズ、
5……コンバータトランス、6……スイツチング
トランジスタ、7……起動抵抗、14……出力電
圧制御回路、18……出力整流回路、21……ツ
エナーダイオード、23……フオトカプラ、26
……トランジスタ、27……デイレー回路。
Figure 1 is a circuit diagram showing one embodiment of the present invention, Figure 2 is a circuit diagram showing an embodiment of the present invention.
The figure is a circuit diagram showing an example of a conventional power supply circuit. 1...AC rectifier circuit, 4, 16...fuse,
5... Converter transformer, 6... Switching transistor, 7... Starting resistor, 14... Output voltage control circuit, 18... Output rectifier circuit, 21... Zener diode, 23... Photocoupler, 26
...Transistor, 27...Delay circuit.
Claims (1)
れたスイツチングトランジスタをオン、オフ制御
し、該トランスの2次側に誘起する電圧を整流し
て負荷に供給するように構成された電源回路にお
いて、 前記電源回路の出力電圧が所定の設定電圧以下
のときに、前記スイツチングトランジスタへのオ
ン制御電流の供給を停止させる保護手段と、 前記電源回路が起動されてから、その出力電圧
が前記設定電圧を超えるまでの時間、前記保護手
段の動作を無効にする遅延手段とを備えたことを
特徴とする電源保護回路。[Claims for Utility Model Registration] A switching transistor inserted in an electrical path connecting a rectifier and the primary side of a transformer is controlled on and off, and the voltage induced on the secondary side of the transformer is rectified and supplied to the load. In the power supply circuit configured to do so, the power supply circuit includes: a protection means that stops supplying an on-control current to the switching transistor when the output voltage of the power supply circuit is equal to or lower than a predetermined set voltage; and a delay means for disabling the operation of the protection means for a period of time until the output voltage exceeds the set voltage.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12631888U JPH0249332U (en) | 1988-09-29 | 1988-09-29 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12631888U JPH0249332U (en) | 1988-09-29 | 1988-09-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0249332U true JPH0249332U (en) | 1990-04-05 |
Family
ID=31377738
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12631888U Pending JPH0249332U (en) | 1988-09-29 | 1988-09-29 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0249332U (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0568329A (en) * | 1991-09-10 | 1993-03-19 | Matsushita Electric Ind Co Ltd | Protector for power supply circuit |
JPH10201078A (en) * | 1997-01-17 | 1998-07-31 | Sumitomo Metal Ind Ltd | Protective circuit |
WO2006132138A1 (en) * | 2005-06-06 | 2006-12-14 | Rohm Co., Ltd. | Dc/dc converter control circuit, and power supply apparatus, light emitting apparatus and electronic device using the same |
-
1988
- 1988-09-29 JP JP12631888U patent/JPH0249332U/ja active Pending
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0568329A (en) * | 1991-09-10 | 1993-03-19 | Matsushita Electric Ind Co Ltd | Protector for power supply circuit |
JPH10201078A (en) * | 1997-01-17 | 1998-07-31 | Sumitomo Metal Ind Ltd | Protective circuit |
WO2006132138A1 (en) * | 2005-06-06 | 2006-12-14 | Rohm Co., Ltd. | Dc/dc converter control circuit, and power supply apparatus, light emitting apparatus and electronic device using the same |
JP2006340587A (en) * | 2005-06-06 | 2006-12-14 | Rohm Co Ltd | Control circuit for externally commutated dc/dc converter and power supply device, light-emitting device, electronic equipment using the same |
US7863833B2 (en) | 2005-06-06 | 2011-01-04 | Rohm Co., Ltd. | DC/DC converter control circuit, and power supply apparatus, light emitting apparatus and electronic device using the same |
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