JPS6383938U - - Google Patents
Info
- Publication number
- JPS6383938U JPS6383938U JP17707986U JP17707986U JPS6383938U JP S6383938 U JPS6383938 U JP S6383938U JP 17707986 U JP17707986 U JP 17707986U JP 17707986 U JP17707986 U JP 17707986U JP S6383938 U JPS6383938 U JP S6383938U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- protection means
- stage
- output voltage
- detects
- 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
- 239000003990 capacitor Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000009499 grossing Methods 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 1
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に係る過電流保護回
路を適用した単出力スイツチング電源の回路図、
第2図は本考案の他の実施例にかかる過電流保護
回路を適用した3出力スイツチング電源の回路図
、第3図は従来の過電流保護回路を適用したスイ
ツチング電源の回路図である。
1:入力一次電源、2:開閉制御素子、3,6
:トランジスタ、4,25,26,29,31:
抵抗、5:平滑回路、7:トランス、8〜13,
23:ダイオード、14〜16:エネルギー蓄積
用コイル、17〜19:平滑用コンデンサ、20
:電流検出用抵抗、21:電流検出回路、22:
制御回路、24:時定数回路用コンデンサ、27
:ツエナーダイオード、28:差動増幅器、30
:補助電源。
FIG. 1 is a circuit diagram of a single output switching power supply to which an overcurrent protection circuit according to an embodiment of the present invention is applied;
FIG. 2 is a circuit diagram of a three-output switching power supply to which an overcurrent protection circuit according to another embodiment of the present invention is applied, and FIG. 3 is a circuit diagram of a switching power supply to which a conventional overcurrent protection circuit is applied. 1: Input primary power supply, 2: Switching control element, 3, 6
:Transistor, 4, 25, 26, 29, 31:
Resistor, 5: Smoothing circuit, 7: Transformer, 8 to 13,
23: Diode, 14-16: Energy storage coil, 17-19: Smoothing capacitor, 20
: Current detection resistor, 21: Current detection circuit, 22:
Control circuit, 24: Time constant circuit capacitor, 27
: Zener diode, 28: Differential amplifier, 30
:Auxiliary power supply.
Claims (1)
せる第1段階の保護手段と、この第1段階の保護
手段による出力電圧の低下を検出し、一定期間こ
の状態が続いたときに入力一次電源を遮断する第
2段階の保護手段とを具備することを特徴とする
過電流保護回路。 (2) 前記第2段階の保護手段が、出力段に並列
に接続されたコンデンサと抵抗からなる時定数回
路と、基準となる一定の電圧を発生する基準電圧
発生回路と、この時定数回路と基準電圧発生回路
の出力電圧を入力とする差動増幅器と、この差動
増幅器の出力にもとづいて、入力一次電源を遮断
する回路とを有する実用新案登録請求の範囲第1
項記載の過電流保護回路。[Claims for Utility Model Registration] (1) A first-stage protection means that detects an overcurrent condition and reduces the output voltage, and a first-stage protection means that detects a decrease in the output voltage due to the first-stage protection means and that detects an overcurrent condition and reduces the output voltage. An overcurrent protection circuit comprising: second stage protection means for cutting off input primary power when this state continues. (2) The second stage protection means includes a time constant circuit consisting of a capacitor and a resistor connected in parallel to the output stage, a reference voltage generation circuit that generates a constant voltage as a reference, and this time constant circuit. Utility model registration claim 1 comprising a differential amplifier that receives the output voltage of a reference voltage generation circuit as input, and a circuit that cuts off the input primary power supply based on the output of the differential amplifier.
Overcurrent protection circuit described in section.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17707986U JPS6383938U (en) | 1986-11-18 | 1986-11-18 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17707986U JPS6383938U (en) | 1986-11-18 | 1986-11-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6383938U true JPS6383938U (en) | 1988-06-01 |
Family
ID=31117944
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17707986U Pending JPS6383938U (en) | 1986-11-18 | 1986-11-18 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6383938U (en) |
-
1986
- 1986-11-18 JP JP17707986U patent/JPS6383938U/ja active Pending