KR950007844B1 - Washing control circuit on power-off for washer - Google Patents

Abstract

The circuit includes an external interrupt operated by the rectangular wave inputted by a rectangular wave generator (CC), and an internal interrupt operated by the micom (MICOM) software, thereby using a prior counter circuit to perform an instantaneous interruption compensating function in the microcomputer (MICOM) to minimize the capacitance of the capacitor (C2) to reduce the system price.

Description

Malfunction prevention circuit during momentary power failure of electric washing machine

1 is an operation circuit diagram of the present invention,

2 is an operational flow diagram of the present invention, (a) an external interrupt routine, (b) an internal interrupt routine,

3 is an operational waveform diagram of the present invention.

* Explanation of symbols for main parts of the drawings

AA: Constant Voltage Circuit BB: Driver

CC: square wave generator

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a circuit for preventing malfunctions during instantaneous power failure of an electric washing machine. In particular, when a commercial power source used in a general household is unstable and the power supply is momentarily interrupted and then returned, the existing electricity controlled by the microcomputer The washing machine relates to a malfunction prevention circuit during an instantaneous power failure of an electric washing machine to prevent the microcomputer from being initialized as the power supply is momentarily cut off.

In the conventional case, a microcapacitor having a large capacity is connected to the constant voltage power supply circuit AA to prevent malfunction of the electric washing machine generated during instantaneous power failure, thereby delaying the blackout time so that the microcomputer does not malfunction even when the power supply is momentarily interrupted. It was composed of a circuit.

However, the conventional technology as described above has a problem that the size of the electrolytic capacitor is increased, not only increases the hopper on the circuit board but also increases the manufacturing cost.

Accordingly, the present invention has been made in view of the above-mentioned conventional problems. When the voltage supply is momentarily cut off using the square wave generator circuit C of the existing circuit, the power consumption of the driving unit BB is cut off. It is an object of the present invention to provide a malfunction prevention circuit during an instantaneous power failure of an electric washing machine that minimizes the power to prevent the malfunction of the microcomputer. Hereinafter, the method steps and the effects of the present invention will be described with reference to the submerged drawings.

In order to achieve the object of the present invention, an external interrupter operating by a square wave input by a square wave generator circuit CC and an internal interrupt by software are used in an electric washing machine that controls the driving unit BB using a microcomputer. When the input power is normally input, the square wave is input to the microcomputer interrupt port at 20 / 16.66 [m / s] cycle. When an external interrupt is applied, the moment is "x" seconds or more that can be delayed by the electrolytic capacitor of the power capacity of the power circuit unit AA. Initializing the RAM 1 (RAM 1) that counts when a power failure occurs, and is one bit (BIT) indicating whether the driver BB is turned off due to a momentary power failure in any other RAM. Check, and if the normal power is input, since this bit is “0”, perform the control of the driver and other routines, and then return to the main device again. In this case, in order to prevent the interruption from being performed due to a malfunction, a step of checking whether power is continuously applied for "M" seconds, and if the RAM 2 is less than "M" seconds, there may be a malfunction due to noise. Increasing 2 (RAM 2) by 1, turning off all drives and returning to the main routine, and powering up normally to allow RAM 2 to be "M" seconds and continue to receive external interrupts. The external interrupt and driver, including the step of clearing RAM 2 since the power supply is normal, and then clearing the driver BB off indication bit and sending it to the step of controlling the driver BB and performing other routines. Checking if the off-mark bit is "1"; if this bit is 0, it checks if RAM 1 is "X" seconds; if it is not "X" seconds, RAM 1 (RAM) 1) in increments of "1" Performing the other routines such as the display and returning to the main routine, and setting the driver off display bit to "1" because it is a sudden power failure when RAM 1 becomes "X" seconds. It consists of an internal interrupt that includes clearing RAM 1 for use again, and turning off the entire eastern part and returning to the main routine.

Referring to the effects of the present invention configured as described above are as follows.

As shown in FIG. 1, when AC 110V / 220V commercial power is applied to A and B points (see FIG. 3A), C and D points are alternating through the voltage drop transformer T. This voltage is converted into a direct current voltage by the electrolytic capacitor Cl through the rectifier Dl and converted into a Vcc voltage through the constant voltage IC and the electrolytic capacitor C2 (Fig. 3 (C) ) Reference).

At this time, if AC "Y" [V] is applied to the point "E", the transistor TR3 is turned on through the resistor R7 and the transistor TR3 is turned on so that the point "F" becomes low level and the power supply is low level at the point "E". Transistor TR3 is turned off and the " F " point is at a high level. The voltage waveform at this time is input as shown in FIG. In other words. In the case of 60 [HZ], 16.66 .... [m / s] In case of 50 [HZ], it is input in 20 [m / s] interval.

In addition, when the drive unit BB outputs a high level signal from the microcomputer output terminal “OUT” port, the transistor TR4 is turned on through the resistor R9, and the current flows from the collector of the transistor TR4 to the emitter through the gate terminal G at the terminal T1 of the triac TRC. The triac TRC turns on and powers up and drives the load.

As described above, the present invention generates a square wave 50/60 [HZ] generated by the square wave generating circuit and is constantly input at an interval of 20 / 6.66 ‥‥ [m / s]. If the power is momentarily outage by using the existing circuit that can accurately count the time), the microcapacity compensation function can be minimized by performing the instantaneous power failure compensation function at the microcomputer, and the cost can be reduced. It is an invention that can reduce the space can see the advantages in many ways.

Claims (1)

In an electric washing machine for controlling the drive unit BB using a microcomputer. Using an external interrupt operated by the square wave input by the square wave generator circuit (CC) and an internal interrupt by software. When the input power is normally input, the square wave is input to the microcomputer interrupt port at 20 / 16.66 [m / s] cycle, and when an external interrupt is applied, the moment is "x" seconds or more that can be delayed by the electrolytic capacitor of the power capacity of the power circuit unit AA. Initializing RAM 1, which counts when a power failure occurs, and checks whether a bit BIT indicating whether the driver BB is turned off due to a momentary power failure in any other RAM is checked. And if the normal power is input, this bit is “0”. Then, control the drive BB and perform other routines, and then return to the main device again. If the bit is “1”, interrupt occurs due to malfunction. Checking if the power is continuously applied for "M" seconds to prevent it from being performed, and if RAM 2 is not "M" seconds, it may be a malfunction due to noise. Increased by "1" The system, turning off all the drives BB and returning to the main routine; and if the power is normally input so that the RAM 2 becomes " M " ) And then checking whether the external interrupt and the driver (BB) off indication bit are "1", including clearing the driver off indication bit and sending it to the driver control and other routine execution. If this bit is 0, it is normal operation. Then, RAM 1 checks if "X" seconds is applied. If it is not "X" seconds, increases RAM 1 by 1, displays, etc. Performing another routine and returning to the main routine; setting the drive (BB) off indication bit to " 1 " To clear RAM 1 Step and an OFF the bulbs East and during short interruptions of the washing machines, characterized by consisting of a interrupt comprises an internal step for returning to the main routine malfunction prevention circuit.

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