JPS63160088U - - Google Patents
Info
- Publication number
- JPS63160088U JPS63160088U JP5105787U JP5105787U JPS63160088U JP S63160088 U JPS63160088 U JP S63160088U JP 5105787 U JP5105787 U JP 5105787U JP 5105787 U JP5105787 U JP 5105787U JP S63160088 U JPS63160088 U JP S63160088U
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- circuit
- switching element
- voltage
- main switching
- 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.)
- Granted
Links
- 238000001514 detection method Methods 0.000 claims description 5
- 238000004804 winding Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 230000007423 decrease Effects 0.000 claims 1
- 230000000087 stabilizing effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 2
- 238000009499 grossing Methods 0.000 description 1
Description
第１図は従来装置の回路例図、第２図は主スイ
ツチング素子制御用駆動回路の補助電源回路の定
電圧特性図、第３図は本考案の一実施例回路図、
第４図はその制御用駆動回路用補助電源回路の電
圧特性図である。
１…入力フイルタコンデンサ、２…主スイツチ
ング素子、３…電圧変換用トランス、Ｎ１，Ｎ２
，Ｎ３…第１、第２、第３巻線、４…整流回路、
５…平滑回路、６…電流検出抵抗、７…第２補助
電源回路、Ｄ…整流素子、Ｃ…コンデンサ、８…
誤差検出回路、９…制御用駆動回路、１０…第１
補助電源回路、Ｒ…電流制限抵抗、ＺＤ１，ＺＤ
２…ツエナダイオード、Ｑ…制御用トランジスタ
素子。
Fig. 1 is a circuit diagram of a conventional device, Fig. 2 is a constant voltage characteristic diagram of an auxiliary power supply circuit of a drive circuit for controlling a main switching element, and Fig. 3 is a circuit diagram of an embodiment of the present invention.
FIG. 4 is a voltage characteristic diagram of the auxiliary power supply circuit for the control drive circuit. 1... Input filter capacitor, 2... Main switching element, 3... Voltage conversion transformer, N 1 , N 2
, N3 ...first, second, and third windings, 4...rectifier circuit,
5... Smoothing circuit, 6... Current detection resistor, 7... Second auxiliary power supply circuit, D... Rectifying element, C... Capacitor, 8...
error detection circuit, 9... control drive circuit, 10... first
Auxiliary power supply circuit, R...Current limiting resistor, ZD 1 , ZD
2 ...Zena diode, Q...control transistor element.
Claims (1)
電流制限抵抗と第１ツエナダイオードの直列回路
と、上記電流制限抵抗と並列にベースとコレクタ
が接続された制御用トランジスタ素子を介して安
定化電圧をうる第１補助電源回路により、主スイ
ツチング素子の制御用駆動回路に動作電圧を供給
すると共に、主スイツチング素子と第１巻線が直
列の電圧変換用トランスに設けた第３巻線を電源
とする第２補助電源回路から動作電圧が供給され
る誤差検出回路の検出出力により制御される上記
主スイツチング素子の制御用駆動回路により主ス
イツチング素子をオンオフ制御して出力を安定化
するスイツチング電源装置において、前記第１補
助電源回路の制御用トランジスタ素子のベースと
コレクタ間において前記電流制限抵抗と直列に第
２ツエナダイオードを接続し、そのツエナ電圧を
選定して、前記入力電圧の低下時における前記誤
差検出回路の検出機能の喪失時前記第１補助電源
回路の制御用トランジスタ素子をカツトオフとし
て、前記制御用駆動回路への動作電圧の供給が停
止されるようにしたことを特徴とするスイツチン
グ電源装置の補助電源回路。 A first circuit that obtains a stabilized voltage through a series circuit of a current limiting resistor and a first Zener diode to which the input power of the switching power supply is applied, and a control transistor element whose base and collector are connected in parallel with the current limiting resistor. The auxiliary power supply circuit supplies the operating voltage to the control drive circuit of the main switching element, and also supplies the second auxiliary switching element with a power source from the third winding provided in the voltage conversion transformer in which the main switching element and the first winding are connected in series. In the switching power supply device, the main switching element is controlled on and off by a control drive circuit for the main switching element, which is controlled by a detection output of an error detection circuit to which an operating voltage is supplied from the power supply circuit, thereby stabilizing the output. A second Zener diode is connected in series with the current limiting resistor between the base and collector of the control transistor element of the auxiliary power supply circuit, and its Zener voltage is selected to detect the error detection circuit when the input voltage decreases. An auxiliary power supply circuit for a switching power supply apparatus, characterized in that when a function is lost, a control transistor element of the first auxiliary power supply circuit is cut off, and supply of operating voltage to the control drive circuit is stopped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5105787U JPH0343836Y2 (en) | 1987-04-06 | 1987-04-06 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5105787U JPH0343836Y2 (en) | 1987-04-06 | 1987-04-06 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63160088U true JPS63160088U (en) | 1988-10-19 |
| JPH0343836Y2 JPH0343836Y2 (en) | 1991-09-13 |
Family
ID=30874980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5105787U Expired JPH0343836Y2 (en) | 1987-04-06 | 1987-04-06 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0343836Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012157099A (en) * | 2011-01-24 | 2012-08-16 | Nec Lighting Ltd | Constant current output circuit and lighting device |
-
1987
- 1987-04-06 JP JP5105787U patent/JPH0343836Y2/ja not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012157099A (en) * | 2011-01-24 | 2012-08-16 | Nec Lighting Ltd | Constant current output circuit and lighting device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0343836Y2 (en) | 1991-09-13 |
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