JPH0354384U - - Google Patents
Info
- Publication number
- JPH0354384U JPH0354384U JP11445789U JP11445789U JPH0354384U JP H0354384 U JPH0354384 U JP H0354384U JP 11445789 U JP11445789 U JP 11445789U JP 11445789 U JP11445789 U JP 11445789U JP H0354384 U JPH0354384 U JP H0354384U
- Authority
- JP
- Japan
- Prior art keywords
- output
- power supply
- voltage
- switching power
- supply circuit
- 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
- 238000012544 monitoring process Methods 0.000 claims 2
- 238000004804 winding Methods 0.000 claims 2
- 230000000903 blocking effect Effects 0.000 claims 1
- 230000007423 decrease Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 8
Landscapes
- Rectifiers (AREA)
Description
第１図は、この考案の直流電源装置の一実施例
を示す回路構成図、第２図は、第１図に示したＤ
Ｃ−ＤＣコンバータの出力特性を示す図、第３図
は、この考案の直流電源装置の他の実施例を示す
回路構成図、第４図は、第３図に示したＤＣ−Ｄ
Ｃコンバータの出力特性を示す図、第５図，６図
は、それぞれ従来の直流電源装置の一例を示す回
路構成図及び要部の等価回路図、第７図は、第５
図に示したＤＣ−ＤＣコンバータの出力特性を示
す図である。
４……スイツチング電源回路、５，６……直流
出力回路、７，８……負荷回路、９……トランス
、１１……フオトカプラ、１２……ＤＣ−ＤＣコ
ンバータ、２１，３１……直流電源装置、２２，
３２……過電流保護回路。
FIG. 1 is a circuit diagram showing an embodiment of the DC power supply device of this invention, and FIG. 2 is a diagram showing the D
A diagram showing the output characteristics of the C-DC converter, FIG. 3 is a circuit configuration diagram showing another embodiment of the DC power supply device of this invention, and FIG. 4 is a diagram showing the output characteristics of the DC-DC converter shown in FIG.
Figures 5 and 6 are diagrams showing the output characteristics of the C converter, and Figures 5 and 6 are a circuit configuration diagram and an equivalent circuit diagram of the main parts, respectively, showing an example of a conventional DC power supply.
It is a figure which shows the output characteristic of the DC-DC converter shown in the figure. 4...Switching power supply circuit, 5, 6...DC output circuit, 7, 8...Load circuit, 9...Transformer, 11...Photocoupler, 12...DC-DC converter, 21, 31...DC power supply device ,22,
32...Overcurrent protection circuit.
Claims (1)
用意された二次巻き線に誘起するパルス電流を、
それぞれ整流平滑して出力するとともに、特定の
直流出力を、電気的に絶縁されたカプラを介して
前記トランスの二次側から一次側に帰還し、出力
電圧を定電圧制御するスイツチング電源回路と、
このスイツチング電源回路の前記特定の直流出力
以外の直流出力を供給され、これを昇圧又は降圧
するＤＣ−ＤＣコンバータと、このＤＣ−ＤＣコ
ンバータの負荷電流が定格を越える過電流である
ことを検出し、前記カプラに作用して前記スイツ
チング電源回路の断続比を出力が低下する側に切
り替える過電流保護回路とを具備する直流電源装
置。 (2) 前記過電流保護回路は、ＤＣ−ＤＣコンバ
ータの出力電圧を、ベースに接続されたツエナー
ダイオードのツエナー電圧を基準に監視する監視
用トランジスタと、この監視用トランジスタの切
り替えを受けて動作し、前記カプラの入力を前記
スイツチング電源回路の出力が低下する方向に強
制する駆動用トランジスタを有することを特徴と
する請求項１記載の直流電源装置。 (3) 前記過電流保護回路は、前記ＤＣ−ＤＣコ
ンバータの出力電圧を監視し、これが一定電圧以
下に降圧したときに順方向に導通し、前記カプラ
の入力を前記スイツチング電源回路の出力が低下
する方向に強制する逆流阻止ダイオードを有する
ことを特徴とする請求項１記載の直流電源装置。[Claims for Utility Model Registration] (1) Intermittent current in the primary winding of a transformer to induce pulse current in a plurality of secondary windings,
a switching power supply circuit that rectifies and smoothes and outputs each DC output, and returns a specific DC output from the secondary side of the transformer to the primary side via an electrically insulated coupler to control the output voltage at a constant voltage;
A DC-DC converter that is supplied with a DC output other than the specific DC output of this switching power supply circuit and steps up or steps down the voltage, and detects that the load current of this DC-DC converter is an overcurrent exceeding the rated value. and an overcurrent protection circuit that acts on the coupler to switch the on/off ratio of the switching power supply circuit to a side that reduces output. (2) The overcurrent protection circuit includes a monitoring transistor that monitors the output voltage of the DC-DC converter based on a Zener voltage of a Zener diode connected to the base, and operates in response to switching of this monitoring transistor. 2. The DC power supply device according to claim 1, further comprising a driving transistor that forces the input of the coupler in a direction in which the output of the switching power supply circuit decreases. (3) The overcurrent protection circuit monitors the output voltage of the DC-DC converter, conducts in the forward direction when the output voltage drops below a certain voltage, and connects the input of the coupler to the output of the switching power supply circuit. 2. The DC power supply device according to claim 1, further comprising a reverse blocking diode that forces the current in the direction of the reverse current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11445789U JPH0354384U (en) | 1989-09-29 | 1989-09-29 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11445789U JPH0354384U (en) | 1989-09-29 | 1989-09-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0354384U true JPH0354384U (en) | 1991-05-27 |
Family
ID=31662825
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11445789U Pending JPH0354384U (en) | 1989-09-29 | 1989-09-29 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0354384U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007123099A1 (en) * | 2006-04-18 | 2007-11-01 | Oki Power Tech Co., Ltd. | Switching power supply circuit |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61244264A (en) * | 1985-04-19 | 1986-10-30 | Hitachi Ltd | Multi-output dc voltage converting circuit |
| JPS622330B2 (en) * | 1981-07-06 | 1987-01-19 | Nippon Electric Co | |
| JPS62230355A (en) * | 1986-03-31 | 1987-10-09 | Ricoh Co Ltd | Multi-output switching regulator |
| JPS63217973A (en) * | 1987-03-05 | 1988-09-12 | Iwatsu Electric Co Ltd | Overcurrent protective circuit for switching power source |
| JPH01144359A (en) * | 1987-11-30 | 1989-06-06 | Nippon Chemicon Corp | Switching power circuit |
-
1989
- 1989-09-29 JP JP11445789U patent/JPH0354384U/ja active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS622330B2 (en) * | 1981-07-06 | 1987-01-19 | Nippon Electric Co | |
| JPS61244264A (en) * | 1985-04-19 | 1986-10-30 | Hitachi Ltd | Multi-output dc voltage converting circuit |
| JPS62230355A (en) * | 1986-03-31 | 1987-10-09 | Ricoh Co Ltd | Multi-output switching regulator |
| JPS63217973A (en) * | 1987-03-05 | 1988-09-12 | Iwatsu Electric Co Ltd | Overcurrent protective circuit for switching power source |
| JPH01144359A (en) * | 1987-11-30 | 1989-06-06 | Nippon Chemicon Corp | Switching power circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007123099A1 (en) * | 2006-04-18 | 2007-11-01 | Oki Power Tech Co., Ltd. | Switching power supply circuit |
| JP2007288951A (en) * | 2006-04-18 | 2007-11-01 | Oki Power Tech Co Ltd | Switching supply circuit |
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