JPH0370618U

JPH0370618U -

Info

Publication number: JPH0370618U
Application number: JP12957589U
Authority: JP
Priority date: 1989-11-06
Filing date: 1989-11-06
Publication date: 1991-07-16
Anticipated expiration: 2004-11-06
Also published as: JPH0751768Y2

Description

[Brief explanation of drawings]

第１図は、本考案の一実施例に係る構成図、第
２図は、タイマ回路の構成図、第３図は動作を説
明するための信号波形図、第４図は、従来の電流
制御回路の構成を示す図である。１…タイマ回路、２…積分回路、３…比較器、
４…スイツチング素子、５…電流検出器、６…レ
ベル変換器、７…バイパス回路、８…電源、９…
電気コイル、１０…マイクロコンピユータ、１１
…クロツク発振回路、１２…整流器、１３…抵抗
、１４…Ｄ／Ａコンバータ、１５…作動増幅器、
１６…三角波発振回路、１７…周期タイマ、１８
…切換えタイマレジスタ、１９…切換えタイマ、
１０１…ハイ・ロー信号波形、１０２…スイツチ
ング指令信号波形、１０３…フイードバツク信号
波形、１０４…オン・オフ信号波形。 Fig. 1 is a block diagram of an embodiment of the present invention, Fig. 2 is a block diagram of a timer circuit, Fig. 3 is a signal waveform diagram for explaining the operation, and Fig. 4 is a conventional current control diagram. FIG. 2 is a diagram showing the configuration of a circuit. 1...Timer circuit, 2...Integrator circuit, 3...Comparator,
4... Switching element, 5... Current detector, 6... Level converter, 7... Bypass circuit, 8... Power supply, 9...
Electric coil, 10... Microcomputer, 11
...clock oscillation circuit, 12...rectifier, 13...resistor, 14...D/A converter, 15...operational amplifier,
16... Triangular wave oscillation circuit, 17... Period timer, 18
...Switching timer register, 19...Switching timer,
101...High/low signal waveform, 102...Switching command signal waveform, 103...Feedback signal waveform, 104...ON/OFF signal waveform.

Claims

[Claims for Utility Model Registration] In a current control circuit that controls the current flowing through an electric coil of a load in accordance with a current command output from a microcomputer, the current command in binary numerical format output from the microcomputer is converted into a PWM signal format. an integrating circuit that integrates the current command in the PWM signal format and outputs a pseudo switching command signal in the form of a triangular wave; and a detection circuit that detects the current flowing through the electric coil and increases or decreases according to the current value. A current detector that outputs a current signal, a level converter that converts the signal level of the detected current signal output from the current detector and outputs a feedback signal, and a feedback signal output from the level converter and switching. A comparator that compares command signals and switches between an on signal and an off signal and outputs it, and when an on signal is input, the power supply and electric coil are connected, and when an off signal is input, the power supply and electric coil are connected. A switching element that cuts off the connection between the coil, a bypass circuit that reduces the current that flows through the electric coil when the connection between the power source and the electric coil is cut off, and a bypass circuit that reduces the current that flows through the electric coil when the connection between the power source and the electric coil continues. A current control circuit characterized by comprising a power source for increasing current.