JPH0248895Y2 - - Google Patents
Info
- Publication number
- JPH0248895Y2 JPH0248895Y2 JP4829383U JP4829383U JPH0248895Y2 JP H0248895 Y2 JPH0248895 Y2 JP H0248895Y2 JP 4829383 U JP4829383 U JP 4829383U JP 4829383 U JP4829383 U JP 4829383U JP H0248895 Y2 JPH0248895 Y2 JP H0248895Y2
- Authority
- JP
- Japan
- Prior art keywords
- terminal
- transistor
- voltage
- relay
- comparator
- 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.)
- Expired
Links
- 238000001514 detection method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 2
Landscapes
- Continuous-Control Power Sources That Use Transistors (AREA)
Description
【考案の詳細な説明】
本考案は、吐き出し型定電流電源に関する。従
来定電流電源は、負荷を接続していない時には、
内部電源電圧がそのまま出力端子に現われ、この
電圧値は一般に高電圧である場合が多いので非常
に危険であつた。又負荷を接続した瞬間高電圧が
そのままこの負荷の両端に加わり、半導体等の負
荷の破損の原因となる定格電圧オーバや、また瞬
間設定値以上の過電流が流れるという欠点があつ
た。[Detailed Description of the Invention] The present invention relates to a discharge type constant current power supply. Conventional constant current power supplies, when no load is connected,
The internal power supply voltage appears as it is at the output terminal, and this voltage value is generally high in many cases, which is extremely dangerous. In addition, the moment a load is connected, a high voltage is directly applied to both ends of the load, causing the rated voltage to exceed which may cause damage to the load such as a semiconductor, or causing an instantaneous overcurrent exceeding the set value to flow.
本考案は、これらの負荷接続前に高電圧が出力
されないようにする事と設定以上の電流が負荷接
続時に流れなくする事とを目的とする。 The purpose of the present invention is to prevent high voltage from being output before these loads are connected, and to prevent current exceeding the setting from flowing when the loads are connected.
第１図に従来の定電流電源の回路図を示して説
明する。負荷５が電源の＋側出力端子４及び−側
出力端子６に接続されていない場合、定電流検出
抵抗７の両端には電圧が生じない為、差動増幅器
２の−側入力端子の電圧は０ボルトとなる。 FIG. 1 shows a circuit diagram of a conventional constant current power supply and will be explained. If the load 5 is not connected to the + side output terminal 4 and the - side output terminal 6 of the power supply, no voltage is generated across the constant current detection resistor 7, so the voltage at the - side input terminal of the differential amplifier 2 is It becomes 0 volt.
従つて設定電流に相当する電圧の電源１を＋側
入力端に加えた差動増幅器２は、十分大きな＋電
圧を出力し、トランジスタ３のベースに充分なベ
ース電流を流しこもうとする。 Therefore, the differential amplifier 2 to which the power supply 1 having a voltage corresponding to the set current is applied to its + side input terminal outputs a sufficiently large + voltage and tries to cause a sufficient base current to flow into the base of the transistor 3.
その結果トランジスタのエミツタにつながれた
＋側出力端子４にはトランジスタ３のコレクタに
加わつている電源８の電圧がそのままあらわれて
しまう。従つて負荷５を接続した瞬間、この電圧
が負荷５の両端に加わつたり、差動増幅器２の周
波数応答特性によつて瞬時設定電流以上の電流を
負荷に流す危険性があつた。 As a result, the voltage of the power supply 8 applied to the collector of the transistor 3 appears as is at the + side output terminal 4 connected to the emitter of the transistor. Therefore, the moment the load 5 was connected, there was a risk that this voltage would be applied to both ends of the load 5, or that a current exceeding the instantaneous set current would flow through the load due to the frequency response characteristics of the differential amplifier 2.
本考案は吐き出し型定電流電源回路に於て、３
つの電圧源（それぞれＡ，Ｂ及びＣと称す）と差
動増幅器とコンパレータとリレーと抵抗とトラン
ジスタとから構成され、前記電圧源Ａを前記差動
増幅器の＋の入力端子と接続し、前記差動増幅器
の出力端子を前記トランジスタのベース端子と接
続し、前記トランジスタのコレクタ端子を前記リ
レーの一方の接点端子と接続し、他方の接点端子
を前記電圧源Ｂと接続し、前記トランジスタのエ
ミツタ端子を負荷が接続される一方の端子と接続
し、他方の端子を前記抵抗及び前記コンパレータ
の＋の入力端子及び前記差動増幅器の−の入力端
子とそれぞれ接続し、前記コンパレータの一端子
を前記電圧源Ｃと接続し、前記コンパレータの出
力端子と前記リレーのコイル端子を接続した事を
特徴とする定電流電源である。 This invention has three functions in a discharge type constant current power supply circuit.
The voltage source A is connected to the positive input terminal of the differential amplifier, and the voltage source A is connected to the positive input terminal of the differential amplifier, and The output terminal of the dynamic amplifier is connected to the base terminal of the transistor, the collector terminal of the transistor is connected to one contact terminal of the relay, the other contact terminal is connected to the voltage source B, and the emitter terminal of the transistor is connected. is connected to one terminal to which a load is connected, the other terminal is connected to the resistor, the + input terminal of the comparator, and the - input terminal of the differential amplifier, and one terminal of the comparator is connected to the voltage The constant current power supply is connected to a power source C, and the output terminal of the comparator and the coil terminal of the relay are connected.
第２図は本考案の一実施例を示す回路図であ
る。同図において−側出力端子６と定電流検出用
抵抗と差動増幅器２の−側入力端子及びコンパレ
ータ９の＋側入力端子を互いに接続する。またリ
レー９の−側入力端子と電圧源１２を接続しコン
パレータ９の出力端子とリレー１０のコイル側端
子を接続する。またリレー１０の接点１１の一方
の端子とトランジスタ３のコレクタ端子とを接続
し、リレー１０の接点１１の他方の端子と電圧源
８とを接続する。さらに電圧源１と差動増幅器２
の＋側入力端子を接続し、差動増幅器２の出力端
子とトランジスタ３のベースとを接続し、トラン
ジスタ３のエミツタと＋側出力端子４を接続す
る。このように接続することにより負荷５が接続
されていない時は、端子４と６との間に電流が流
れない為、定電流検出用抵抗７の両端の電圧は０
ボルトとなる。電圧源１２は０ボルトでもよい
が、コンパレータの否反転時の動作を安定なもの
とする為弱若電圧をもたせておく。従つてコンパ
レータ９の出力は反転せずリレー１０のコイルに
は通電されないからリレー１０の接点１１は開放
のままであり出力端子４に電圧源８の電圧が出力
される事はない。負荷５が出力端子４及び６に接
続されると差動増幅器２の出力端子からトランジ
スタ３のベースへ流れこんだ電流はエミツタを通
して端子４、負荷５、端子６、抵抗７の順に電流
が流れ、抵抗７の両端に電位差が生じる。従つて
コンパレータ９は、−側の入力端子より＋側の入
力端子の電圧が大きくなり反転する。この時リレ
ー１０のコイルは通電され、リレー１１の接点は
接続される。この為、トランジスタ３のコレクタ
端子が電源８と接続され通常の定電流電源として
動作を行う事になる。 FIG. 2 is a circuit diagram showing an embodiment of the present invention. In the figure, the negative output terminal 6, the constant current detection resistor, the negative input terminal of the differential amplifier 2, and the positive input terminal of the comparator 9 are connected to each other. Further, the negative input terminal of the relay 9 is connected to the voltage source 12, and the output terminal of the comparator 9 and the coil side terminal of the relay 10 are connected. Further, one terminal of the contact 11 of the relay 10 and the collector terminal of the transistor 3 are connected, and the other terminal of the contact 11 of the relay 10 and the voltage source 8 are connected. Furthermore, voltage source 1 and differential amplifier 2
, the output terminal of the differential amplifier 2 and the base of the transistor 3 are connected, and the emitter of the transistor 3 and the + side output terminal 4 are connected. With this connection, when the load 5 is not connected, no current flows between the terminals 4 and 6, so the voltage across the constant current detection resistor 7 is 0.
Becomes a bolt. Although the voltage source 12 may be 0 volts, it is provided with a weak voltage in order to stabilize the operation of the comparator when the comparator is not inverted. Therefore, the output of the comparator 9 is not inverted and the coil of the relay 10 is not energized, so the contact 11 of the relay 10 remains open and the voltage of the voltage source 8 is not output to the output terminal 4. When the load 5 is connected to the output terminals 4 and 6, the current flowing from the output terminal of the differential amplifier 2 to the base of the transistor 3 flows through the emitter in the order of the terminal 4, the load 5, the terminal 6, and the resistor 7. A potential difference occurs between both ends of the resistor 7. Therefore, the voltage at the input terminal on the + side of the comparator 9 becomes larger than that at the input terminal on the - side, and the voltage is inverted. At this time, the coil of relay 10 is energized and the contacts of relay 11 are connected. Therefore, the collector terminal of the transistor 3 is connected to the power supply 8 and operates as a normal constant current power supply.
以上述べた様に本考案を用いれば、負荷の未接
続時に於いて＋の出力端子に高電圧を出力したり
負荷接続時に設定以上の過電流を瞬時たりとも流
すことのない、定電流電源を供給することが可能
となり高圧危険防止や、半導体負荷等の定格電圧
オーバによる負荷の破損も無くす事が可能とな
る。本実施例ではリレーを用いたが、リレーの代
りにトランジスタを用いることによりリレーの機
械的寿命の欠点を除く事も考えられる。 As described above, if the present invention is used, a constant current power supply can be created that does not output high voltage to the + output terminal when no load is connected, and does not flow an overcurrent exceeding the setting even momentarily when a load is connected. This makes it possible to prevent high voltage hazards and eliminate damage to loads such as semiconductor loads due to exceeding the rated voltage. Although a relay is used in this embodiment, it is also possible to use a transistor in place of the relay to eliminate the shortcoming of the mechanical life of the relay.
又、一実施例としてNPNトランジスタを使つ
た場合を示したが、PNPトランジスタを使用す
る事も当然考えられる。 Further, although the case where an NPN transistor is used is shown as an example, it is naturally possible to use a PNP transistor.
更に定電流を設定する電圧源に可変電圧源を用
いることにより任意の定電流を得る事も可能であ
る。 Furthermore, by using a variable voltage source as the voltage source for setting the constant current, it is also possible to obtain an arbitrary constant current.
第１図は従来の定電流電源回路を示す回路図、
第２図は本考案の一実施例を示す回路図である。
図に於いて、１は目標定電流設定用電圧源、２
は差動増幅器、３はトランジスタ、４は＋側出力
端子、５は負荷抵抗、６は−側出力端子、７は電
流値検出用抵抗、８，１２は電圧源、９はコンパ
レータ、１０はリレーのコイル、１１はリレーの
接点である。
Figure 1 is a circuit diagram showing a conventional constant current power supply circuit.
FIG. 2 is a circuit diagram showing an embodiment of the present invention. In the figure, 1 is the voltage source for setting the target constant current, 2
is a differential amplifier, 3 is a transistor, 4 is a + side output terminal, 5 is a load resistor, 6 is a - side output terminal, 7 is a current value detection resistor, 8 and 12 are voltage sources, 9 is a comparator, and 10 is a relay The coil 11 is a relay contact.
Claims (1)
と差動増幅器とコンパレータとリレーと抵抗とト
ランジスタとから構成され、前記電圧源Ａを前記
差動増幅器の＋の入力端子と接続し、前記差動増
幅器の出力端子を前記トランジスタのベース端子
と接続し、前記トランジスタのコレクタ端子を前
記リレーの一方の接点端子と接続し、他方の接点
端子を前記電圧源Ｂと接続し、前記トランジスタ
のエミツタ端子を負荷が接続される一方の端子と
接続し、他方の端子を前記抵抗及び前記コンパレ
ータの＋の入力端子及び前記差動増幅器の−の入
力端子とそれぞれ接続し、前記コンパレータの端
子を前記電圧源Ｃと接続し、前記コンパレータの
出力端子と前記リレーのコイル端子を接続した事
を特徴とする定電流電源。 Three voltage sources (referred to as A, B and C, respectively)
and a differential amplifier, a comparator, a relay, a resistor, and a transistor, the voltage source A is connected to the + input terminal of the differential amplifier, and the output terminal of the differential amplifier is connected to the base terminal of the transistor. a collector terminal of the transistor is connected to one contact terminal of the relay, the other contact terminal is connected to the voltage source B, and an emitter terminal of the transistor is connected to one terminal to which a load is connected; The other terminal is connected to the resistor, the + input terminal of the comparator, and the - input terminal of the differential amplifier, the terminal of the comparator is connected to the voltage source C, and the output terminal of the comparator and the relay are connected. A constant current power supply characterized by connecting coil terminals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4829383U JPS59155613U (en) | 1983-04-01 | 1983-04-01 | constant current power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4829383U JPS59155613U (en) | 1983-04-01 | 1983-04-01 | constant current power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59155613U JPS59155613U (en) | 1984-10-19 |
| JPH0248895Y2 true JPH0248895Y2 (en) | 1990-12-21 |
Family
ID=30178829
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4829383U Granted JPS59155613U (en) | 1983-04-01 | 1983-04-01 | constant current power supply |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59155613U (en) |
-
1983
- 1983-04-01 JP JP4829383U patent/JPS59155613U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59155613U (en) | 1984-10-19 |
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