JPH02110996U

JPH02110996U -

Info

Publication number: JPH02110996U
Application number: JP1989018281U
Authority: JP
Priority date: 1989-02-17
Filing date: 1989-02-17
Publication date: 1990-09-05

Description

[Brief explanation of drawings]

第１図は本考案に係る電流制限回路の第１の実
施例を示した回路図、第２図はその回路のモータ
電流ＩＭとモータへの印加電圧ＶＭと第１のトラ
ンジスタのエミツタ、コレクタ間電圧ＶＴの関係
を示したグラフ、第３図はその回路のＩＭ―ＶＭ
特性を示したグラフ、第４図は第２の抵抗にダイ
オードを並列に設けた例を示した回路図、第５図
は第４図の回路を採用して制限電流ＩＯＳを調整
した場合のＩＭ―ＶＭ特性を示したグラフ、第６
図は第２の実施例を示した回路図、第７図及び第
８図は従来の電流制限回路を示した回路図。１０……第１のトランジスタ、１２……ＤＣモ
ータ、１４……第１の抵抗、１６……電源、１８
……第２のトランジスタ、２０……第２の抵抗、
２６……ダイオード。 Fig. 1 is a circuit diagram showing a first embodiment of the current limiting circuit according to the present invention, and Fig. 2 shows the circuit between the motor current IM, the voltage applied to the motor, and the emitter and collector of the first transistor. A graph showing the relationship between voltage VT and Figure 3 is the IM-VM of the circuit.
A graph showing the characteristics, Figure 4 is a circuit diagram showing an example of a diode connected in parallel to the second resistor, and Figure 5 is an IM when the circuit in Figure 4 is adopted and the limiting current IOS is adjusted. -Graph showing VM characteristics, Part 6
The figure is a circuit diagram showing a second embodiment, and FIGS. 7 and 8 are circuit diagrams showing conventional current limiting circuits. 10...First transistor, 12...DC motor, 14...First resistor, 16...Power supply, 18
... second transistor, 20 ... second resistor,
26...diode.

Claims

[Claims for Utility Model Registration] 1. A first transistor arranged in series between a load and a power source; a first resistor arranged in series to the emitter of the first transistor; a second transistor disposed in parallel with the first resistor to the base of the transistor; and a voltage polarity between the emitter of the first transistor and the base of the second transistor;
and a second resistor arranged to be the same as the resistance of the first transistor, and when the first transistor is connected to the positive side of the power source, a PNP type is used, and the first transistor is connected to the negative side of the power source. A current limiting circuit characterized in that it uses an NPN type. 2. A diode is provided whose anode side is connected to the emitter of the first transistor and whose cathode side is connected to the base of the second transistor, and which is arranged in parallel with the second resistor. The current limiting circuit according to claim 1.