JPH0190287U - - Google Patents
Info
- Publication number
- JPH0190287U JPH0190287U JP18498687U JP18498687U JPH0190287U JP H0190287 U JPH0190287 U JP H0190287U JP 18498687 U JP18498687 U JP 18498687U JP 18498687 U JP18498687 U JP 18498687U JP H0190287 U JPH0190287 U JP H0190287U
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- power supply
- base
- 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
- 238000009499 grossing Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
Description
第１図は本考案の一実施例を示す回路図、第２
図は第１図の回路要部の動作を説明するための回
路図、第３図は従来例を示す回路図である。
１……入力端子、Ｑ１……主トランジスタ、Ｑ
２……第２のトランジスタ、Ｒ５……第１の抵抗
、Ｒ６……第２の抵抗、Ｄ２……ダイオード。
Figure 1 is a circuit diagram showing one embodiment of the present invention;
This figure is a circuit diagram for explaining the operation of the main parts of the circuit shown in FIG. 1, and FIG. 3 is a circuit diagram showing a conventional example. 1...Input terminal, Q 1 ...Main transistor, Q
2 ...Second transistor, R5 ...First resistor, R6 ...Second resistor, D2 ...Diode.
Claims (1)
タによつて断続制御してパルス電圧を発生させ、
該パルス電圧を整流平滑して所定の直流出力電圧
を得るスイツチング電源回路において、主トラン
ジスタのベース・エミツタ間に第２のトランジス
タを接続し、主トランジスタがオンのとき第２の
トランジスタがオフし、主トランジスタがオフの
とき第２のトランジスタがオンするように構成す
るとともに、第２のトランジスタのベースを、第
１の抵抗を介して入力端子に接続し、かつ該ベー
スを第２の抵抗とダイオードの直列回路を介して
第２のトランジスタのエミツタに接続したことを
特徴とするスイツチング電源回路。 The DC voltage applied to the input terminal is controlled intermittently by the main transistor to generate a pulse voltage.
In a switching power supply circuit that obtains a predetermined DC output voltage by rectifying and smoothing the pulse voltage, a second transistor is connected between the base and emitter of the main transistor, and when the main transistor is on, the second transistor is turned off; The second transistor is configured to be turned on when the main transistor is off, and the base of the second transistor is connected to the input terminal via the first resistor, and the base is connected to the second resistor and the diode. A switching power supply circuit characterized in that the switching power supply circuit is connected to the emitter of a second transistor through a series circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18498687U JPH0190287U (en) | 1987-12-04 | 1987-12-04 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18498687U JPH0190287U (en) | 1987-12-04 | 1987-12-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0190287U true JPH0190287U (en) | 1989-06-14 |
Family
ID=31476317
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18498687U Pending JPH0190287U (en) | 1987-12-04 | 1987-12-04 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0190287U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05276742A (en) * | 1992-03-19 | 1993-10-22 | Toko Inc | Dc/dc converter |
-
1987
- 1987-12-04 JP JP18498687U patent/JPH0190287U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05276742A (en) * | 1992-03-19 | 1993-10-22 | Toko Inc | Dc/dc converter |