JPH0425482U - - Google Patents
Info
- Publication number
- JPH0425482U JPH0425482U JP6598890U JP6598890U JPH0425482U JP H0425482 U JPH0425482 U JP H0425482U JP 6598890 U JP6598890 U JP 6598890U JP 6598890 U JP6598890 U JP 6598890U JP H0425482 U JPH0425482 U JP H0425482U
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- circuit
- switching
- ground
- current prevention
- 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
- 230000002265 prevention Effects 0.000 claims description 6
- 239000003990 capacitor Substances 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 4
- 238000009499 grossing Methods 0.000 claims description 3
- 238000004804 winding Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
Description
第１図は本考案による電源保護回路の一実施例
を適用したスイツチング電源回路を示す回路図、
第２図は従来のスイツチング電源回路を示す回路
図である。
２……ダイオードブリツジ、３，１１，１９…
…平滑コンデンサ、４……変換トランス、４ａ…
…１次巻線、４ｂ……ベース巻線、４ｃ……２次
巻線、５……ラツシユ防止抵抗、６，２２……サ
イリスタ、７……ラツシユ電流防止回路、８……
スイツチングトランジスタ、９……起動用抵抗、
１０，１８……ダイオード、１４……電圧検出用
トランジスタ、１２，１７……整流回路、２０，
２１，２３，２７……抵抗、２５……コンデンサ
、２６……トランジスタ。
FIG. 1 is a circuit diagram showing a switching power supply circuit to which an embodiment of the power supply protection circuit according to the present invention is applied;
FIG. 2 is a circuit diagram showing a conventional switching power supply circuit. 2...Diode bridge, 3, 11, 19...
...Smoothing capacitor, 4...Conversion transformer, 4a...
...Primary winding, 4b...Base winding, 4c...Secondary winding, 5...Lush prevention resistor, 6, 22...Thyristor, 7...Lush current prevention circuit, 8...
Switching transistor, 9...Starting resistor,
10, 18... Diode, 14... Voltage detection transistor, 12, 17... Rectifier circuit, 20,
21, 23, 27...Resistor, 25...Capacitor, 26...Transistor.
Claims (1)
一対の整流出力端子の一極と接地間に平滑コンデ
ンサが接続され、該整流出力端子の一極がスイツ
チング電源部に接続され、上記整流出力端子の他
極と接地間にラツシユ電流防止抵抗が接続され、
上記交流入力電源の投入時以外の定常動作時に上
記ラツシユ電流防止抵抗の両端を短絡する短絡回
路が該ラツシユ電流防止抵抗に並列に接続され、
上記スイツチング電源部のスイツチング素子の制
御端子にスイツチング信号を入力して上記平滑コ
ンデンサよりの直流を上記スイツチング素子によ
つてスイツチングし、上記スイツチング電源部で
直流出力電源を作り出すスイツチング電源回路に
おいて、 上記ラツシユ電流防止抵抗の両端電圧を検出す
る電圧検出回路と、 上記スイツチング素子の制御端子と接地間に接
続され、上記電圧検出回路の検出出力に基づいて
上記定常動作時に該制御端子を接地に短絡する制
御端子短絡回路とを備えたことを特徴とする電源
保護回路。[Claim for Utility Model Registration] A smoothing capacitor is connected between one pole of a pair of rectified output terminals of a diode bridge that rectifies an AC input power source and the ground, and one pole of the rectified output terminal is connected to a switching power supply section. , a rush current prevention resistor is connected between the other pole of the rectified output terminal and ground,
A short circuit that shorts both ends of the rush current prevention resistor during steady operation other than when the AC input power is turned on is connected in parallel to the rush current prevention resistor,
In the switching power supply circuit, a switching signal is inputted to a control terminal of a switching element of the switching power supply unit, the DC from the smoothing capacitor is switched by the switching element, and the switching power supply unit generates a DC output power. a voltage detection circuit that detects the voltage across the current prevention resistor; and a control circuit that is connected between the control terminal of the switching element and ground, and short-circuits the control terminal to ground during the steady operation based on the detection output of the voltage detection circuit. A power supply protection circuit characterized by comprising a terminal short circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6598890U JPH0425482U (en) | 1990-06-25 | 1990-06-25 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6598890U JPH0425482U (en) | 1990-06-25 | 1990-06-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0425482U true JPH0425482U (en) | 1992-02-28 |
Family
ID=31598318
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6598890U Pending JPH0425482U (en) | 1990-06-25 | 1990-06-25 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0425482U (en) |
-
1990
- 1990-06-25 JP JP6598890U patent/JPH0425482U/ja active Pending