JPH0169386U - - Google Patents
Info
- Publication number
- JPH0169386U JPH0169386U JP1988134311U JP13431188U JPH0169386U JP H0169386 U JPH0169386 U JP H0169386U JP 1988134311 U JP1988134311 U JP 1988134311U JP 13431188 U JP13431188 U JP 13431188U JP H0169386 U JPH0169386 U JP H0169386U
- Authority
- JP
- Japan
- Prior art keywords
- switching
- output
- power supply
- current
- reference value
- 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 8
- 230000000087 stabilizing effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 10
Landscapes
- Protection Of Static Devices (AREA)
- Dc-Dc Converters (AREA)
Description
第１図はスイツチング電源を示す回路図、第２
図はこの考案によるスイツチング電源の保護装置
を示す回路図、第３図はその入力と電力検出電圧
との関係を示す図、第４図はラツチ回路３６の具
体例を示す接続図である。
１１，１２……入力端子、１３……トランス、
１４……スイツチング素子、１７……整流回路、
１８，１９……出力端子、２１……負荷、１６…
…スイツチング制御端子、２５……電流検出用抵
抗器、２６，２７……電圧検出用抵抗器、２９…
…比較器、３２……基準電圧用の定電圧素子、３
６……ラツチ回路。
Figure 1 is a circuit diagram showing a switching power supply, Figure 2 is a circuit diagram showing a switching power supply.
FIG. 3 is a circuit diagram showing the protection device for a switching power supply according to this invention, FIG. 3 is a diagram showing the relationship between the input and the power detection voltage, and FIG. 4 is a connection diagram showing a specific example of the latch circuit 36. 11, 12...Input terminal, 13...Transformer,
14... Switching element, 17... Rectifier circuit,
18, 19...Output terminal, 21...Load, 16...
...Switching control terminal, 25...Resistor for current detection, 26, 27...Resistor for voltage detection, 29...
... Comparator, 32 ... Constant voltage element for reference voltage, 3
6...Latch circuit.
補正 昭６３．１１．１１
考案の名称を次のように補正する。
考案の名称 スイツチング電源の保護装置
実用新案登録請求の範囲、図面の簡単な説明を
次のように補正する。Amendment November 11, 1986 The name of the invention is amended as follows. Title of the invention Protection device for switching power supply The claims for utility model registration and the brief description of the drawings are amended as follows.
【実用新案登録請求の範囲】
直流電源からトランスの１次側へ供給する入力
電流をスイツチング手段によりスイツチングし、
上記トランスの２次側の整流出力を負荷に供給し
、その負荷に印加する出力電圧が一定になるよう
に上記スイツチング手段を制御し、上記入力電流
を検出する電流検出手段の出力に上記直流電源の
電圧に比例した電圧を加算し、その加算値と基準
値とを比較器で比較し、その比較出力で上記スイ
ツチング手段を制御するスイツチング電源におい
て、上記加算値が上記基準値を越えた場合に上記
比較器の出力を自己保持するラツチ回路と、その
ラツチ回路のラツチ出力により上記スイツチング
手段をオフの状態にする遮断手段とを具備するス
イツチング電源の保護装置。[Scope of claim for utility model registration] Switching the input current supplied from the DC power source to the primary side of the transformer by switching means,
The rectified output of the secondary side of the transformer is supplied to the load, the switching means is controlled so that the output voltage applied to the load is constant, and the DC power source is connected to the output of the current detection means for detecting the input current. In a switching power supply that adds a voltage proportional to the voltage of A protection device for a switching power supply, comprising: a latch circuit that self-holds the output of the comparator; and a cutoff means that turns off the switching means by the latch output of the latch circuit.
【図面の簡単な説明】
第１図はスイツチング電源を示す回路図、第２
図はこの考案によるスイツチング電源の保護装置
を示す回路図、第３図はその入力と電力検出電圧
との関係を示す図、第４図はラツチ回路３６の具
体例を示す接続図である。
１１，１２……入力端子、１３……トランス、
１４……スイツチング素子、１７……整流回路、
１８，１９……出力端子、２１……負荷、１６…
…スイツチング制御端子、２５……電流検出用抵
抗器、２６，２７……電圧検出用抵抗器、２９…
…比較器、３２……基準電圧用の定電圧素子、３
６……ラツチ回路。[Brief explanation of the drawings] Figure 1 is a circuit diagram showing a switching power supply, Figure 2 is a circuit diagram showing a switching power supply.
FIG. 3 is a circuit diagram showing the protection device for a switching power supply according to this invention, FIG. 3 is a diagram showing the relationship between the input and the power detection voltage, and FIG. 4 is a connection diagram showing a specific example of the latch circuit 36. 11, 12...Input terminal, 13...Transformer,
14... Switching element, 17... Rectifier circuit,
18, 19...Output terminal, 21...Load, 16...
...Switching control terminal, 25...Resistor for current detection, 26, 27...Resistor for voltage detection, 29...
... Comparator, 32 ... Constant voltage element for reference voltage, 3
6...Latch circuit.
Claims (1)
御回路よりの制御信号により入力直流電流をスイ
ツチングするスイツチング手段と、そのスイツチ
ング手段のスイツチング出力電流が供給されるト
ランスと、そのトランスの出力を整流して負荷へ
供給する整流回路と、その整流回路の出力電圧を
検出してその出力電圧がほぼ一定になるように上
記スイツチング手段のスイツチング幅を制御する
安定化手段とを具備するスイツチング電源におい
て、上記スイツチング手段の入力電流を検出する
電流検出手段と、上記スイツチング電源の入力直
流電圧を検出する電圧検出手段と、温度変動に応
じて発生する基準値が変動する基準値発生手段と
、上記電流検出手段及び上記電圧検出手段の両検
出信号を加算した値と上記基準値とを比較する比
較器と、上記加算値が基準値を越えた場合に上記
比較器の出力をラツチするラツチ回路と、そのラ
ツチ回路よりのラツチ出力により上記スイツチン
グ手段をオフの状態にする遮断手段とを具備する
スイツチング電源の保護装置。 A switching control circuit, a switching means for switching input DC current according to a control signal from the switching control circuit, a transformer to which the switching output current of the switching means is supplied, and the output of the transformer is rectified and supplied to the load. In a switching power supply comprising a rectifying circuit and a stabilizing means for detecting an output voltage of the rectifying circuit and controlling a switching width of the switching means so that the output voltage becomes approximately constant, the input current of the switching means is a current detecting means for detecting the input DC voltage of the switching power supply; a reference value generating means for generating a reference value that fluctuates in accordance with temperature fluctuation; the current detecting means and the voltage detecting means. a comparator that compares the sum of both detection signals with the reference value, a latch circuit that latches the output of the comparator when the added value exceeds the reference value, and a latch output from the latch circuit. A protection device for a switching power supply, comprising a cutoff means for turning off the switching means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988134311U JPH0169386U (en) | 1988-10-13 | 1988-10-13 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988134311U JPH0169386U (en) | 1988-10-13 | 1988-10-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0169386U true JPH0169386U (en) | 1989-05-09 |
Family
ID=31392955
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988134311U Pending JPH0169386U (en) | 1988-10-13 | 1988-10-13 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0169386U (en) |
-
1988
- 1988-10-13 JP JP1988134311U patent/JPH0169386U/ja active Pending
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