JPH037679U - - Google Patents
Info
- Publication number
- JPH037679U JPH037679U JP6877189U JP6877189U JPH037679U JP H037679 U JPH037679 U JP H037679U JP 6877189 U JP6877189 U JP 6877189U JP 6877189 U JP6877189 U JP 6877189U JP H037679 U JPH037679 U JP H037679U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- transformer
- overcurrent
- reset
- current
- 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 6
- 239000003990 capacitor Substances 0.000 claims description 2
- 238000009499 grossing Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 6
- 230000002265 prevention Effects 0.000 description 2
- 230000005669 field effect Effects 0.000 description 1
Landscapes
- Dc-Dc Converters (AREA)
Description
第１図は本考案による過電流防止回路を設けた
スイツチングレギユレータの結線図、第２図は従
来の過電流防止装置を備えたスイツチングレギユ
レータの結線図、第３図と第４図はスイツチング
レギユレータの各部の電圧電流波形を示し、第３
図は常時の波形図、第４図は従来のスイツチング
レギユレータの過電流時の波形図、第５図と第６
図はスイツチングレギユレータの出力電圧Ｖ０−
電流Ｉ０特性を示し、第５図は従来の特性図、第
６図は本考案による回路の特性図である。
２……変圧器、２ａ……一次コイル、２ｂ……
出力コイル、２ｃ……リセツトコイル、３……電
界効果トランジスタ、４……過電流検出回路、５
……主電流回路、６……制御回路、７……出力回
路、８……リセツト回路、９……過電流検出回路
、２６……コンデンサ、２７……ツエナダイオー
ド。
Fig. 1 is a wiring diagram of a switching regulator equipped with an overcurrent prevention circuit according to the present invention, Fig. 2 is a wiring diagram of a switching regulator equipped with a conventional overcurrent prevention device, and Figs. Figure 4 shows the voltage and current waveforms of each part of the switching regulator.
The figure is a normal waveform diagram, Figure 4 is a waveform diagram of a conventional switching regulator during overcurrent, and Figures 5 and 6 are
The figure shows the output voltage V 0 − of the switching regulator.
FIG . 5 is a conventional characteristic diagram, and FIG. 6 is a characteristic diagram of a circuit according to the present invention. 2...Transformer, 2a...Primary coil, 2b...
Output coil, 2c... Reset coil, 3... Field effect transistor, 4... Overcurrent detection circuit, 5
... Main current circuit, 6 ... Control circuit, 7 ... Output circuit, 8 ... Reset circuit, 9 ... Overcurrent detection circuit, 26 ... Capacitor, 27 ... Zener diode.
Claims (1)
流検出抵抗を直列に接続して直流電源に接続され
た主電流回路と、前記変圧器に巻かれて一端が前
記一次コイルに接続され他端がリセツトダイオー
ドを介して前記直流電源のマイナス端に接続され
たリセツトコイルからなるリセツト回路と、前記
変圧器に巻かれた出力コイルウに平滑回路が接続
された出力回路と、パルスを発生しこのパルスで
前記スイツチング素子を導通するとともに前記出
力回路の電圧で前記パルスの幅を制御する制御回
路と、前記過電流検出抵抗の電流が所定値を越え
ると前記制御回路を介して前記スイツチング素子
の電流を遮断する過電流検出回路を備えたスイツ
チングレギユレータの過電流保護回路において、
前記リセツトダイオードと直流電源のマイナス端
との間にコンデンサとツエナダイオードの並列回
路を挿入し、この並列回路の電圧を前記過電流検
出回路の入力端に印加することを特徴とするスイ
ツチングレギユレータの過電流保護回路。 A main current circuit that connects the primary coil of the transformer, a switching element, and an overcurrent detection resistor in series and is connected to a DC power supply, and a main current circuit that is wound around the transformer and has one end connected to the primary coil and the other end a reset diode. a reset circuit consisting of a reset coil connected to the negative end of the DC power supply through the transformer; and an output circuit comprising a smoothing circuit connected to the output coil wound around the transformer, which generates pulses and uses the pulses to control the switching. a control circuit that conducts the element and controls the width of the pulse using the voltage of the output circuit; and an overcurrent circuit that cuts off the current of the switching element via the control circuit when the current of the overcurrent detection resistor exceeds a predetermined value. In the overcurrent protection circuit of a switching regulator equipped with a current detection circuit,
A switching regulator characterized in that a parallel circuit of a capacitor and a Zener diode is inserted between the reset diode and the negative terminal of the DC power supply, and the voltage of this parallel circuit is applied to the input terminal of the overcurrent detection circuit. overcurrent protection circuit for the controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6877189U JPH037679U (en) | 1989-06-13 | 1989-06-13 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6877189U JPH037679U (en) | 1989-06-13 | 1989-06-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH037679U true JPH037679U (en) | 1991-01-24 |
Family
ID=31603493
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6877189U Pending JPH037679U (en) | 1989-06-13 | 1989-06-13 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH037679U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013543717A (en) * | 2010-09-16 | 2013-12-05 | チップ トップ チップス・サール | Generator suitable for supplying power to dental superposition lamps |
-
1989
- 1989-06-13 JP JP6877189U patent/JPH037679U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013543717A (en) * | 2010-09-16 | 2013-12-05 | チップ トップ チップス・サール | Generator suitable for supplying power to dental superposition lamps |