JPS59117299U

JPS59117299U - Power transistor chopper circuit

Info

Publication number: JPS59117299U
Application number: JP1983009859U
Authority: JP
Inventors: 茂栗山; 神長　実; 井上　信男
Original assignee: 株式会社日立製作所
Priority date: 1983-01-28
Filing date: 1983-01-28
Publication date: 1984-08-08

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) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は本考案を含む制御回路図、第２図は従来制御に
よるベース電流特性線図、第３図は第１図の動作を説明
するための特性線図、第４図は本考案の応用例を示す回
路図、第５図は第４図の動作を説明するための特性線図
、第６図は第４図の細部を示す回路図である。３・・・電流検出器、４−・・・モータ、５・・・トラ
ンジスタチョッパ、７・・・ベース電流回路、８・・・
定電圧回路、９・・・定電圧線、１１・・・通流率制御
回路、１２・・・ベース電流−両回路、１３・・・ベー
ス電流検出回路、１４・・・温度補償回路。Fig. 1 is a control circuit diagram including the present invention, Fig. 2 is a base current characteristic diagram according to conventional control, Fig. 3 is a characteristic diagram for explaining the operation of Fig. 1, and Fig. 4 is a diagram of the base current characteristic according to the present invention. FIG. 5 is a circuit diagram showing an application example, FIG. 5 is a characteristic diagram for explaining the operation of FIG. 4, and FIG. 6 is a circuit diagram showing details of FIG. 4. 3... Current detector, 4-... Motor, 5... Transistor chopper, 7... Base current circuit, 8...
Constant voltage circuit, 9... Constant voltage line, 11... Conductivity control circuit, 12... Base current-both circuits, 13... Base current detection circuit, 14... Temperature compensation circuit.

Claims

[Scope of utility model registration request]

In the control circuit that limits the maximum peak current value of a transistor chopper circuit in which 2 to 4 power transistors are connected in parallel, the voltage between the pace emitters when the power transistors are energized exceeds the specified value. A power transistor chopper circuit characterized in that the current limit value is reduced when the current limit value is reduced.