JPS59189483U - constant current circuit - Google Patents
constant current circuitInfo
- Publication number
- JPS59189483U JPS59189483U JP8195683U JP8195683U JPS59189483U JP S59189483 U JPS59189483 U JP S59189483U JP 8195683 U JP8195683 U JP 8195683U JP 8195683 U JP8195683 U JP 8195683U JP S59189483 U JPS59189483 U JP S59189483U
- Authority
- JP
- Japan
- Prior art keywords
- load
- constant current
- current circuit
- controlled
- main transistor
- 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
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図は従来の定電流回路を第２図は、本考案の定電流
回路をそれぞれ示す図である。図中ＴＲ１は主トランジ
スタ、Ｔ１はトランス、Ｎ１〜Ｎ４は巻線、ｏｖｐは過
電圧保護回路、ｏｃｐは過電流保護回路、ＡＭＰｌ、Ａ
ＭＰ２は誤差増幅器である。FIG. 1 shows a conventional constant current circuit, and FIG. 2 shows a constant current circuit according to the present invention. In the figure, TR1 is the main transistor, T1 is the transformer, N1 to N4 are the windings, ovp is the overvoltage protection circuit, ocp is the overcurrent protection circuit, AMPl, A
MP2 is an error amplifier.
Claims (1)
線の両端に負荷を接続するとともに該二次巻線の中点を
接地し、該負荷に流れる電流と第１の基準値と第１の比
較手段により比較し、比較結果により該主トランジスタ
のオン、オフの周期を制御し、該負荷に流れ負荷電流を
一定に保つ様制御するとともに、負荷電圧と第２の基準
値を第２の比較手段により比較し、比較結果により該主
トランジスタのオン、オフの周期を制御して、該負荷に
過電圧が印加されるのを防止する定電流回路において、 該二次巻線の中点と両端間にそれぞれ負荷電圧検出回路
を設け、該負荷電圧検出回路出力を該第２の比較手段に
入力する様にしたことを特徴とする定電流回路。[Claims for Utility Model Registration] A main transistor is connected to the primary winding of a transformer, a load is connected to both ends of the secondary winding, and the middle point of the secondary winding is grounded, and the current flowing through the load and The first reference value is compared with the first comparing means, and based on the comparison result, the on/off period of the main transistor is controlled, the load current flowing through the load is controlled to be kept constant, and the load voltage and the In the constant current circuit, the reference value of the second transistor is compared by a second comparing means, and the on/off period of the main transistor is controlled based on the comparison result to prevent overvoltage from being applied to the load. A constant current circuit characterized in that a load voltage detection circuit is provided between the middle point and both ends of the next winding, and the output of the load voltage detection circuit is inputted to the second comparison means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8195683U JPS59189483U (en) | 1983-05-31 | 1983-05-31 | constant current circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8195683U JPS59189483U (en) | 1983-05-31 | 1983-05-31 | constant current circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59189483U true JPS59189483U (en) | 1984-12-15 |
Family
ID=30211904
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8195683U Pending JPS59189483U (en) | 1983-05-31 | 1983-05-31 | constant current circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59189483U (en) |
-
1983
- 1983-05-31 JP JP8195683U patent/JPS59189483U/en active Pending
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