KR0129224B1 - Interrupt signal generation apparatus in a washing machine - Google Patents

Abstract

The microcomputer(1) outputs control signals necessary for the process of each part. The power source(2) rectifies and levels the secondary current stepped down by the transformer(T) and delivers it to microcomputer(1) and also to other necessary circuits, then the automatic off control part(8) drives the automatic off switch(9) following the control of the microcomputer(1). The interrupt signal generating device includes AC voltage coming through the triac in the automatic off control(8), a resistor(R4) to step down the 220V AC to provide 60Hz spherical wave to the microcomputer(1), a diode(D6) to half-wave rectify the AC current, an interrupt part(3) and a load drive part(5).

Description

Interrupt signal generator for washing machines and dishwashers

1 is a circuit diagram of an interrupt signal generator of a conventional washing machine and dishwasher.

FIG. 2 is a waveform diagram of input and output signals for each part.

Figure 3 is a circuit diagram of the interrupt signal generator of the present invention washing machine and dishwasher.

* Explanation of symbols for main parts of the drawings

1: microcomputer 2: power supply

3: interrupt unit 4: display unit

5: load driving unit 6: key input unit

7: Oscillator 8: Auto Off Control

9: Auto Off Switch T: Trans

Q1, Q2: Transistor Tr1: Triac

The present invention relates to an interrupt signal generating device for a washing machine and a dishwasher, and more particularly to a washing machine and a dishwasher capable of protecting loads and triacs by realizing accurate zero crossing without delay of phase during load control in synchronization with an interrupt signal. An interrupt signal generator.

The interrupt signal generator circuit of the conventional washing machine and dishwasher, as shown in FIG. 1, outputs a control signal necessary for each stroke to each unit in accordance with various input signals to control the entire operation. And a power supply unit (2) for supplying a constant voltage to the microcomputer (1) and other necessary circuits by receiving a rectified and smooth value from a regulator with a secondary voltage dropped by a transformer (T) through a bridge diode and a capacitor. And the interrupt unit 3 for inputting the AC voltage of the secondary transformer of the transformer to realize the time calculation of the progress stroke and the zero crossing at the time of driving the load, and the selected contents, the process or the process according to the control output of the microcomputer 1. A display unit 4 for displaying an error, a load driver 5 for driving a desired load according to the control output of the microcomputer 1, and a user And a key input unit (6) for selecting a course, and haejum determine the command execution speed of the microcomputer 1 is composed of oscillating region as well as 7, for now the microcomputer (1) is operatively.

Looking at the conventional technology configured as described above are as follows.

When AC 220V, which is a power supply voltage as shown in FIG. 2A, is applied, the voltage is dropped by the transformer T, and the dropped AC voltage is full-wave rectified while passing through the bridge diodes D1-D4. The applied voltage is smoothed again by the capacitor C3 and applied to the input side I of the regulator 2-1.

The regulator 2-1 then converts the voltage input through the input side I into 5V DC and sends it out through its output side O. Accordingly, the DC 5V output from the regulator 2-1 is stabilized once again by the capacitor C2 and then supplies power to all circuits such as the microcomputer 1. In this way, when power is supplied, the oscillator 7 starts oscillation and provides a clock to the microcomputer 1 so that the microcomputer 1 is operated.

In addition, the interrupt unit 3, which receives the AC voltage of the second stage of the transformer T, operates as follows.

That is, when the input AC voltage is in the (+) phase, the base current ib is applied to the base of the transistor Q1 through the resistor R3 to turn on the transistor Q1, so that the power supply voltage terminal VCC Since the voltage of is bypassed to the ground side through the transistor Q1, a low signal is applied to the interrupt terminal INT of the microcomputer 1.

When the voltage at the secondary stage of the transformer T is (-), the base current ib through the resistor R3 does not flow, so that the transistor Q1 is turned off and the interrupt terminal of the microcomputer 1 is turned off. A high signal is applied to (INT) to apply a square wave of 60 Hz as in (b) of FIG.

Subsequently, when the user presses a key through the key input unit 6 to select a desired course, the microcomputer 1 recognizes the input key signal and synchronizes with the square wave input through the interrupt terminal INT thereof. In order to control the load driving signal as shown in (c) of FIG. 2 through the load driving unit 5 to the load.

At this time, the display unit 4 displays the progress or error according to the control output of the microcomputer 1 to inform the user.

However, in such a conventional technique, the input signal of the interrupt unit receives the AC voltage of the transformer secondary stage, and the transformer is composed of a coil to lower the voltage, causing a phase delay between the voltage of the primary stage and the secondary stage voltage. do. Therefore, if the load is controlled in synchronization with the interrupt signal generated by receiving the secondary voltage of the transformer as an input, accurate zero crossing is not performed due to phase delay, resulting in low energy efficiency of the load and progressive damage to the triac and the load. In addition, there was a problem such as noise causes a problem in the reliability of the equipment.

Accordingly, an object of the present invention is to provide an interrupt signal generator for a washing machine and a dishwasher, which can eliminate phase delay by generating an interrupt signal using a power supply voltage and realize zero crossing during load control.

Another object of the present invention is simply input on the substrate using the power supply voltage output to the triac output terminal for driving the auto-off switch without drawing a long line from the AC 220V power supply to apply AC 220V to the input side of the interrupt unit It is to provide an interrupt signal generator of a washing machine and a dishwasher capable of receiving a signal.

The present invention for achieving the above object is to rectify and smooth the secondary voltage dropped by the transformer and a microcomputer for controlling the overall operation by outputting the control signal required for each stroke to each part in accordance with various input signals A power supply unit for supplying the microcomputer and other necessary circuits, an auto-off control unit for driving an auto-off switch under control of the microcomputer, and a power supply voltage output through the triac output terminal of the auto-off control unit And an interrupter for applying a square wave of 60 Hz to the microcomputer.

Hereinafter, look at on the basis of the accompanying drawings as follows.

FIG. 3 is a circuit diagram of an interrupt signal generator for a washing machine and a dish washing machine of the present invention. As shown in the drawing, a microcomputer (1) outputs a control signal necessary for each stroke to each unit according to various input signals to control the entire operation. ), A power supply unit (2) for rectifying and smoothing the secondary voltage dropped by the transformer (T) and supplying it to the microcomputer (1) and other necessary circuits, and the auto-off switch under the control of the microcomputer (1). The microcomputer according to an auto-off control unit 8 for driving (9), and a DC voltage through a triac in the auto-off control unit 8 and an alternating current power supply of the transformer primary through the auto-off switch 9; In order to apply a square wave of 60 Hz to (1), a resistor R4 for bringing down the AC 220V, a diode D6 for half-wave rectifying the AC power supply through the resistor R4, and the diode D6. To Interrupt part consisting of transistor (Q1) and capacitor (C6) for receiving the rectified voltage from diode (D5), resistors (R3, R2) and capacitor (C7) to supply a square wave of 60㎐ to a microcomputer. (3) and a load driver 5 for driving the load in accordance with the control output of the microcomputer 1.

Referring to the operation and effects of the present invention configured as described above in detail.

When AC 220V, a power supply voltage, is applied, the voltage is dropped by the transformer T. The dropped AC voltage is full-wave rectified through the diodes D1 to D4, and the full-wave rectified voltage is smoothed by the capacitor C3. Is applied to the input side I of the regulator 2-1.

The regulator 2-1 then makes an input voltage of 5V DC and sends it out through its output side (O).

Accordingly, the DC 5V output from the regulator 2-1 is stabilized once again by the capacitor C2 and then supplies power to all circuits such as the microcomputer 1.

In this way, when the power is supplied, the oscillator 7 starts oscillation and provides a clock to the microcomputer 1 so that the microcomputer 1 operates.

At this time, the microcomputer 1 outputs a low signal to its output port P1, so that the base current does not flow to the transistor Q2 through the resistor R5, so that the transistor Q2 is turned off. Since it does not flow, the auto-off switch 9 is turned on.

As the auto-off switch 9 is turned on, the AC power supply 220V of the first stage of the transformer T on the input side of the power supply unit 2 is received by the interrupter unit 3 as an input signal, and the operation thereof is as follows.

The voltage applied to the A point of the interrupt unit 3 is applied to a voltage having a current value sufficiently lowered by the resistor R4. When this voltage is the (+) phase, the voltage of the A point is the diode D6. And DC voltage 5V slightly higher than DC voltage (approximately 5.6V), and this voltage is lowered to 5V while passing through diode D5, and the base current at the base of transistor Q1 through resistor R3. The transistor Q1 is turned on by applying (ib).

Therefore, the low signal is applied to the interrupt terminal INT of the microcomputer 1.

On the contrary, when a negative phase voltage is applied to the A point, since the base current is not applied through the resistor R3, the transistor Q1 is turned off, so that the interrupt terminal INT of the microcomputer 1 The high signal is applied.

In this way, a square wave of 60 Hz is applied to the microcomputer 1.

Accordingly, the microcomputer 1 outputs a load driving signal for controlling a necessary load in synchronization with the interrupt signal applied through its interrupt terminal INT to the load driver 5 to realize zero crossing.

As described in detail above, the present invention eliminates phase delay between the interrupt output signal and the AC 220V by using AC 220V itself as an input signal source of the interrupt, and improves the energy efficiency of the load by realizing accurate zero crossing during load control. In addition to protecting the triac and load.

In addition, by using a power supply voltage at a triac output terminal for driving an auto-off switch without applying a long line from an AC 220V power supply to apply an AC 220V to an input side of the interrupt unit 3, an input signal can be easily received on a board. One effect is to make it work.

Claims (1)

A microcomputer (1) for controlling the entire operation by outputting control signals necessary for each stroke in accordance with various input signals; A power supply unit (2) for rectifying and smoothing the secondary voltage dropped by the transformer (T) to supply the microcomputer and other necessary circuits; An auto-off control unit 8 for driving the auto-off switch 9 under the control of the microcomputer 1; A resistor for turning down AC 220V in order to apply a square wave of 60 kHz to the microcomputer according to a DC voltage through the triac in the auto-off control unit and an AC power supply of the transformer 1st stage through the auto-off switch 9 ( R4), the diode D6 for half-wave rectifying the AC power supply through the resistor R4, and the half-wave rectified voltage through the diode D6, the diode D5, the resistors R3, R2 and the capacitor ( An interrupt unit (3) composed of a transistor (Q1) and a capacitor (C6) for receiving a square wave of 60 kHz to the microcomputer by being input through C7); And a load driver (5) for driving the load according to the control output of the microcomputer.