JPH0169383U - - Google Patents
Info
- Publication number
- JPH0169383U JPH0169383U JP1987161170U JP16117087U JPH0169383U JP H0169383 U JPH0169383 U JP H0169383U JP 1987161170 U JP1987161170 U JP 1987161170U JP 16117087 U JP16117087 U JP 16117087U JP H0169383 U JPH0169383 U JP H0169383U
- Authority
- JP
- Japan
- Prior art keywords
- signal
- protection
- output
- section
- 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.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims description 2
- 230000000087 stabilizing effect Effects 0.000 claims 2
- 238000009413 insulation Methods 0.000 claims 1
- 238000002955 isolation Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
- 230000003321 amplification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
Landscapes
- Dc-Dc Converters (AREA)
Description
第１図は本考案の一実施例を示す構成ブロツク
図、第２図は第１図の装置の具体的な回路図、第
３図は本考案の第２の実施例を示す構成ブロツク
図、第４図は第３図の装置の具体的な回路図、第
５図は従来装置の構成ブロツク図である。
１０……ＤＣ−ＤＣコンバータ、２０……誤差
増幅回路、３０……Ｆ／Ｂ制御信号伝送器、４０
……ＰＷＭ制御部、５０，６０……過電流・過電
圧検出回路、７０……比較器、８０……保護信号
伝送器、Ｔ１，Ｔ２，Ｔ３……トランス。
FIG. 1 is a configuration block diagram showing one embodiment of the present invention, FIG. 2 is a specific circuit diagram of the device shown in FIG. 1, and FIG. 3 is a configuration block diagram showing a second embodiment of the present invention. FIG. 4 is a specific circuit diagram of the device shown in FIG. 3, and FIG. 5 is a block diagram of a conventional device. 10...DC-DC converter, 20...Error amplification circuit, 30...F/B control signal transmitter, 40
... PWM control section, 50, 60 ... overcurrent/overvoltage detection circuit, 70 ... comparator, 80 ... protection signal transmitter, T1, T2, T3 ... transformer.
Claims (1)
電圧をスイツチング素子によりオンオフし、二次
側に出力される電力を整流平滑化して出力するＤ
Ｃ−ＤＣコンバータと、 この出力電圧を基準電圧と比較する誤差部、こ
の誤差部で出力される信号を絶縁して一次側に戻
す第１の絶縁部、この絶縁された信号を基準にし
て出力電圧を安定化する制御信号を前記スイツチ
ング素子に伝送するＰＷＭ制御部とよりなる出力
安定回路と、 前記出力電圧が過電圧若しくは過電流である場
合は保護信号を出力する保護状態検出部、この保
護信号を絶縁して一次側に戻す第２の絶縁部とよ
りなり、この絶縁された信号を前記ＰＷＭ制御部
に戻してＤＣ−ＤＣコンバータを保護する保護回
路と、 よりなるスイツチング電源の保護回路において
、 当該第１及び第２の絶縁回路をトランスとした
ことを特徴とするスイツチング電源の保護回路。 (2) 前記第１及び第２の絶縁回路のトランスは
共通であり、 前記ＰＷＭ制御部は正常の運転状態では出力電
流によらず出力電圧が平坦であり、過負荷状態で
は垂下型の特性を有すると共に前記誤差部の出力
する信号に比べて前記保護信号のレベルを大きく
し、保護信号の入力されないときは平坦部となる
信号を出力し、保護信号の入力されたときは垂下
部となる信号を出力すること、 を特徴とする実用新案登録請求の範囲第１項記
載のスイツチング電源の保護回路。[Claims for Utility Model Registration] (1) D that turns on and off the unstable input voltage input to the primary side of the transformer using a switching element, and rectifies and smoothes the power output to the secondary side.
A C-DC converter, an error section that compares this output voltage with a reference voltage, a first insulating section that insulates the signal output from this error section and returns it to the primary side, and outputs with this isolated signal as a reference. an output stabilizing circuit consisting of a PWM control section that transmits a control signal for stabilizing voltage to the switching element; a protection state detection section that outputs a protection signal when the output voltage is overvoltage or overcurrent; A protection circuit for a switching power supply comprising: a second insulating part which insulates the signal and returns it to the primary side, and returns the insulated signal to the PWM control part to protect the DC-DC converter; A protection circuit for a switching power supply, characterized in that the first and second insulation circuits are transformers. (2) The transformers of the first and second isolation circuits are common, and the PWM control section has a flat output voltage regardless of the output current under normal operating conditions, and exhibits a drooping type characteristic under overload conditions. and increases the level of the protection signal compared to the signal output from the error section, outputting a signal that becomes a flat part when the protection signal is not input, and a signal that becomes a drooping part when the protection signal is input. A protection circuit for a switching power supply according to claim 1, characterized in that the switching power supply protection circuit outputs the following.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987161170U JPH0169383U (en) | 1987-10-21 | 1987-10-21 | |
| US07/175,924 US4862339A (en) | 1987-06-05 | 1988-03-31 | DC power supply with improved output stabilizing feedback |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987161170U JPH0169383U (en) | 1987-10-21 | 1987-10-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0169383U true JPH0169383U (en) | 1989-05-09 |
Family
ID=31443887
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987161170U Pending JPH0169383U (en) | 1987-06-05 | 1987-10-21 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0169383U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002262544A (en) * | 2001-03-05 | 2002-09-13 | Fujitsu Ltd | Overvoltage protection device for power supply system, ac/dc converter forming the power supply system and dc/dc converter |
-
1987
- 1987-10-21 JP JP1987161170U patent/JPH0169383U/ja active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002262544A (en) * | 2001-03-05 | 2002-09-13 | Fujitsu Ltd | Overvoltage protection device for power supply system, ac/dc converter forming the power supply system and dc/dc converter |
| JP4651832B2 (en) * | 2001-03-05 | 2011-03-16 | 富士通セミコンダクター株式会社 | Overvoltage protection device for power system |
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