APPARATUS FOR REMOVING NOISE OF MICOM

• Main Author: HAN, GYEONG HAE
• Format: Patent
• Language: English; Korean
• Published: 05.02.2001
• Edition: 7
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; PHYSICS

PURPOSE: An apparatus for removing a noise of a micom is provided to restrain the generation of the noise and prevent an error operation of the micom by using a digital filter designed for changing a reference clock signal according to a period of an interrupt signal in each interrupt input unit. CONSTITUTION: A switching unit has a switch(SW) for changing an operation/sleep mode of a washing machine, the first resistor(R1) and the first condenser(C1). The switching unit generates the first interrupt signal. A zero point detecting unit has a comparator(11) connected with reference resistors(R3,R4) at one input terminal and connected with an AC power and the fifth resistor(R5) at the other input terminal, a full-up resistor(R2) and the second condenser(C2). The zero point detecting unit detects a zero point in the AC power and performs a soft switching without an occurrence of an external noise for generating the second interrupt signal to restrain the occurrence of a noise. A frequency measuring unit counts a frequency of a sensing signal through a sensor(12) and generates a time measuring signal(TC1) for grasping a state of a current system. First to third digital filters(21-23) receive first and second interrupt signals and the time measuring signal(TC1) and removes a noise of each signal for preventing an error operation of a micom(M). A frequency generating unit(30) changes a frequency of a reference clock signal of first to third digital filters(21-23) according to a period of each interrupt signal. A microprocessor(40) performs an operation and a control for processing signals transmitted from the frequency generating unit(30) or first to third digital filters(21-23).