KR0127511B1 - Circuit for ascertaining and compensating the power failure in invert-type washing machine - Google Patents

Abstract

The terminal(P3) of the microcomputer(10) becomes a low level, the triac(TR) is on, the user performs normal washing in accordance with the program set by the user. In case of the electric power stoppage, with the power switch(SW1) on, the high level signal of the DC current(Vcc) is inputted to the terminal(P1) or the microcomputer(10), the stoppage signal(S1) by the AC current is not inputted to the terminal(P2) of the microcomputer(10). When the power is fed, the high level is inputted to the terminal(P1) of microcomputer(10) and the stoppage signal(S1) is inputted to the terminal(P2). Thus, the terminal(P3) becomes a low level, and the remaining process is conducted.

Description

Power failure discrimination compensation circuit of washing machine

1 is a power failure discrimination compensation circuit diagram according to the present invention.

2 is a flow chart of the present invention.

Explanation of symbols on the main parts of the drawings

10: microcomputer SW ₁ : power switch

TR: Triac

The present invention relates to a washing machine. In particular, when the power is not supplied to the washing machine, it is determined whether it is caused by a power failure or a power switch off. It relates to a power failure discrimination compensation circuit of a washing machine.

In general, there is a case in which a washing machine cannot perform washing because the power is not supplied during washing. If the power is not supplied in this way, the power cord is pulled out of the outlet and the power cord is inserted into the outlet. There is a case of power failure with the power cord plugged in and the power switch on, but not powered. In general, if the user wants to reset the setting while performing washing or to stop using the washing machine, the user does not remove the power cord from the outlet and plug it in again.

Therefore, if the power supply is not supplied during washing, it may be determined that the power switch is turned off or in the case of power failure, which may include a case in which the power cord is disconnected from the outlet due to a user's mistake or an abnormal installation. .

According to the present invention, when the user turns off the power switch and the power failure as necessary during the washing, the microcomputer determines the remaining washing operation in the case of power failure and automatically performs the remaining washing operation when the power is supplied again. It is an object of the present invention to provide a power failure discrimination compensation circuit.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a circuit diagram of the present invention, a power switch SW ₁ for supplying or cutting off AC power to a washing machine, and a resistor R ₁ grounded between the power switch SW ₁ and an AC power supply terminal. And the power switch SW ₁ and the resistor R ₁ to determine whether the washing is being performed or whether the power is outage, and to remember the current washing operation at the time of power failure and remaining washing power when the power is supplied again after the power failure. The microcomputer 10, which is a control means for performing only the control means, and a triac TR connected to the power switch SW ₁ and a control signal of the microcomputer 10 is input to the gate.

According to the present invention configured as described above, when the power switch SW ₁ is turned on in the state where the AC power is normally supplied, the high level signal of the DC power supply Vcc is input to the terminal P ₁ of the microcomputer 10 and the terminal ( P ₂ ) is input an interrupt signal S ₁ in response to supply of AC power.

Therefore, since the terminal P ₃ of the microcomputer 10 is at a low level and the triac TR is turned on, normal washing is performed by a program set by the user in the microcomputer 10 (FIG. 2, S ₁ and S). Step ₂ ). If the user turns off the power switch SW ₁ by necessity while washing is being performed, the microcomputer 10 may be inputted to the terminal P ₁ of the microcomputer 10 through the resistor R ₁ . ), The terminal P ₃ is at a high level, the triac TR is turned off, and washing is stopped. However, AC power is still applied, and the interrupt signal continues to the terminal P ₂ of the microcomputer 10. (S ₁ ) is input.

Therefore, the microcomputer 10 determines that the user has turned off the power switch SW _{1 as} necessary in the state where the AC power is being supplied.

On the other hand, when a power failure occurs, the high level signal of the DC power supply Vcc is input to the terminal P ₁ of the microcomputer 10 while the power switch SW ₁ is turned on, but the interrupt signal S ₁ by the AC power supply is received by the microcomputer. It is not input to the terminal (P ₂₎ of the 10 (FIG. 2 S _3, S ₄ steps).

Accordingly, the microcomputer 10 is placed in the memory by the current stroke to the random access memory (RAM) to determine that the power failure (FIG. 2 S ₅ steps). Here, even if the power cord is removed, the microcomputer 10 determines that the power failure. Thereafter, the terminal of the microcomputer 10. When the normal power is re-applied (P ₁₎ roneun the high level and the input terminal (P ₂₎ roneun since the interrupt signal (S ₁₎ an input terminal (P ₃₎ is at a low level tri Ill (TR) is turned on, so that it is performed only in case of power failure the remaining stroke under the control of the microcomputer 10 (FIG. 2 S _6, S ₇ steps).

As described above, when the power failure is performed during the washing, the microcomputer 10 automatically determines the power failure, stores the current stroke in the RAM, and controls to perform only the remaining stroke when the power is supplied again. When power is supplied again after a power failure, the user has to relieve the inconvenience of having to set again.

Claims (2)

A power switch SW _{1 that} is switched to supply or cut power, a triac TR that is connected to the power switch SW ₁ and turned on / off by the control of the microcomputer 10, and the power switch ( SW ₁₎ and the triac (which is connected between the gate of the TR) terminal (P ₁₎ the power switch (SW ₁₎ in the presence or absence of an interrupt signal (S ₁₎ that is input to the signal level and the terminal (P ₂₎ which is input to A power failure discrimination compensation circuit of a washing machine comprising a microcomputer (10) having a program for determining whether the power is off and storing the current stroke in the RAM during power failure and controlling only the remaining stroke during power supply after the power failure. . The power failure discrimination compensation circuit according to claim 1, wherein the microcomputer (10) is configured to discriminate power failure when the power cord is disconnected.