JPH0249335U - - Google Patents
Info
- Publication number
- JPH0249335U JPH0249335U JP12710888U JP12710888U JPH0249335U JP H0249335 U JPH0249335 U JP H0249335U JP 12710888 U JP12710888 U JP 12710888U JP 12710888 U JP12710888 U JP 12710888U JP H0249335 U JPH0249335 U JP H0249335U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- voltage
- resistor
- input
- power supply
- 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
- 230000002265 prevention Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
Landscapes
- Details Of Television Scanning (AREA)
- 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……スタンバイ電源回路、５……ＡＣ整流回
路、７……平滑コンデンサ、８……主電源回路、
１４……ラツシユ防止抵抗、１５，３０……サイ
リスタ、１７……電源リレー、１８……リレード
ライブトランジスタ、２１……トランジスタ、２
４……基準電圧回路、２５……フオトカプラ、２
８……保護回路。
Figure 1 is a circuit diagram showing one embodiment of the present invention;
The figure is a circuit diagram showing an example of a conventional power supply circuit. 1...Standby power supply circuit, 5...AC rectifier circuit, 7...Smoothing capacitor, 8...Main power supply circuit,
14... lash prevention resistor, 15, 30... thyristor, 17... power supply relay, 18... relay drive transistor, 21... transistor, 2
4...Reference voltage circuit, 25...Photocoupler, 2
8...Protection circuit.
Claims (1)
に供給する待機用電源と、前記交流入力源と整流
回路との間に設けられ、かつ前記第１の負荷回路
の動作時にこの負荷回路から供給される制御信号
によつてオン状態となり、交流入力を上記整流回
路に供給する電源リレーと、前記整流回路からの
直流電圧を制御し安定化直流電圧を第２の負荷回
路に供給する主電源回路と、前記電源リレーがオ
ンされた起動時に前記整流回路の直流側に流れる
電流を制限するためのラツシユ防止抵抗と、前記
ラツシユ防止抵抗と並列に接続され、前記主電源
回路が駆動された後、前記ラツシユ防止抵抗を短
絡するスイツチング素子と、前記ラツシユ防止抵
抗の両端電圧を検出する手段を含み、前記主電源
回路が駆動された後にその両端電圧が所定値を越
えたとき、前記電源リレーをオフにする保護回路
とを備えたことを特徴とする電源保護回路。 A standby power source that rectifies the AC input and supplies DC voltage to the first load circuit, and is provided between the AC input source and the rectifier circuit, and is connected to the AC input voltage from the load circuit when the first load circuit is operated. a power supply relay that is turned on by a supplied control signal and supplies AC input to the rectifier circuit; and a main power supply that controls the DC voltage from the rectifier circuit and supplies stabilized DC voltage to the second load circuit. a lash prevention resistor for limiting the current flowing to the DC side of the rectifier circuit at startup when the power supply relay is turned on; and a lash prevention resistor connected in parallel with the lash prevention resistor, after the main power circuit is driven. , comprising a switching element that short-circuits the anti-latch resistor, and means for detecting a voltage across the anti-latch resistor, and when the voltage across the anti-latch resistor exceeds a predetermined value after the main power circuit is driven, the power relay is activated. A power protection circuit characterized by comprising a protection circuit that turns off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12710888U JPH0713398Y2 (en) | 1988-09-30 | 1988-09-30 | Power protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12710888U JPH0713398Y2 (en) | 1988-09-30 | 1988-09-30 | Power protection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0249335U true JPH0249335U (en) | 1990-04-05 |
| JPH0713398Y2 JPH0713398Y2 (en) | 1995-03-29 |
Family
ID=31379232
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12710888U Expired - Lifetime JPH0713398Y2 (en) | 1988-09-30 | 1988-09-30 | Power protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0713398Y2 (en) |
-
1988
- 1988-09-30 JP JP12710888U patent/JPH0713398Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0713398Y2 (en) | 1995-03-29 |