KR940022020A

KR940022020A - Load operation display circuit

Info

Publication number: KR940022020A
Application number: KR1019930005094A
Authority: KR
Inventors: 김윤규
Original assignee: 이헌조; 주식회사 금성사
Priority date: 1993-03-30
Filing date: 1993-03-30
Publication date: 1994-10-19

Abstract

본 발명은 부하동작 표시회로에 관한 것으로, 종래회로는 부하로 전원을 공급하는 선이 단선되어 부하가 동작하지 않을 경우 또는 부하를 연결하지 않았을 경우에도 마이크로 프로세서 출력포트에서 하이신호가 출력되면 부하가동 표시엘이디가 점등되어 부하가 동작중임을 표시하는 문제점이 있었다.The present invention relates to a load operation display circuit. In the conventional circuit, the load is activated when a high signal is output from the microprocessor output port even when the load does not operate because the line supplying power to the load is disconnected or the load is not connected. There is a problem in that the display LED is turned on to indicate that the load is operating.

본 발명은 이와같은 종래회로의 문제점을 감안하여 부하로 입력되는 전원선에 전류트랜스를 설치하여 부하로 실제 전류가 유입하는지 안하는지를 마이크로 프로세서가 파악하여 전류가 유입할 경우에만 부하가동표시를 해주고 전류가 유입되지 않을 경우는 점검표시를 해주는 부하동작 표시회로를 창안한 것이다.In view of the problems of the conventional circuit, the present invention installs a current transformer on a power line input to a load, and the microprocessor determines whether or not the actual current flows into the load, and displays a load operation indication only when the current flows. If does not flow, a load operation indicator circuit is created to display a check mark.

Description

Load operation display circuit

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제2도는 본 발명 부하동작 표시회로도,2 is a load operation display circuit diagram of the present invention;

제3도는 제2도 마이크로 프로세서의 동작순서도.3 is a flow chart of the microprocessor of FIG.

Claims

When the microprocessor 12 which controls the whole and the high level relay driving signal output from the microprocessor 12 port PA are inverted by the inverter 14 and a low state signal is applied to the terminal A, A relay 15 for switching and applying an AC power source AC to the load 18, a current transformer 16 detecting current flowing into the load 18 from the AC power source AC, and outputting a current detection voltage; The comparator 17 which compares the current detection voltage Vdt applied to the non-inverting terminal in the current transformer 16 with the reference voltage Vref applied to the inverting terminal and outputs a current detection signal. 17) After the current detection signal is input to the port PI and the microprocessor 12 outputs the load operation signal to the port PB, the load operation display LED 11 indicating the load operation and the load operation state When the current detection signal is not input from the comparator 17 to the port PI A load operation display circuit comprising a check display LED (13) for displaying a load check when a load check signal is input from a microprocessor (12) port (PC).

※ Note: The disclosure is based on the initial application.