KR0136656B1 - Power supervising circuit - Google Patents

Abstract

The present invention relates to a device for compensating instantaneous power failure of a home appliance, and a method of compensating the same. The instantaneous power failure compensating apparatus of a home appliance having a load driver controlling a driving of a load and a microcomputer generating a predetermined control signal provided to the load driver. A line voltage for converting the line voltage of the AC supplied to the load into a digital signal and a first voltage level reference voltage, which is a voltage identification reference value set to a predetermined value, to output a divided voltage control signal at a predetermined level. According to the level of the identification means and the voltage dividing control signal, the voltage dividing control means for dividing the line voltage provided to the conversion means to a predetermined voltage and the second reference value set to the digital signal and a predetermined value are used to determine the instantaneous voltage drop. Including an instantaneous voltage drop detecting means for detecting to the load when the instantaneous voltage drop is detected. The control signal for cutting off the power supply is to be provided to the load driver.

Description

Device for compensating momentary power failure of home appliances and its compensation method

1 is a circuit diagram of a momentary power compensation device according to an embodiment of the present invention.

2 is a waveform diagram of signals inputted and outputted from the main part of FIG.

3 is a flowchart of a momentary power compensation program performed in the microcomputer of FIG.

* Explanation of symbols for main parts of the drawings

10: microcomputer 20: constant voltage unit

30: reset section 40: square wave generator

50: load driving section 60: conversion section

70: partial pressure control unit

The present invention relates to a device for compensating instantaneous power failure of a home appliance, and a method of compensating the same, particularly for compensating input power to prevent a malfunction of a computer caused by a power failure in a home appliance having a microcomputer (hereinafter referred to as a computer). An apparatus and a method thereof are provided.

It is widely used to control all functions.

Such a computer causes an error in its performance when the commercial power applied to the home appliance system is unstable.

The reason is that the logic operation is normally performed only by a stable DC voltage.

For example, when commercial power supplied to a general home is momentarily interrupted by various well-known external factors (hereinafter referred to as instantaneous power failure), a computer that is supplied with such commercial power usually has a program corresponding to its operation. It operates abnormally as if the procedure of the function control program reset to the initial stage (or initial state) or loaded into the memory is confusing.

If the computer is reset due to a momentary power failure, the computer switches the control to the initial operation state or closes the execution operation regardless of the process of the corresponding program being executed, and then for other administration than the desired operation. You run a program, that is, it behaves abnormally.

As described above, when an initial operation or malfunction of a computer occurs due to a momentary power failure, since the normal operation is not performed in a home appliance that performs a function by the control of the computer, the product is deteriorated in reliability.

For example, in a washing machine with a built-in computer, when the computer malfunctions due to an instantaneous power failure, the desired washing administration procedure may be changed, causing damage to the laundry, or switching to the initial state of the stroke, to perform unnecessary stroke again. As a result, the user has become an important factor in reducing the reliability of the product.

As a conventional method for preventing a computer malfunction caused by such a power failure, a method of delaying a time for an input power supply by a predetermined time by connecting an electrolytic capacitor having a large capacity to a constant voltage power supply circuit has been provided.

In addition, as disclosed in the malfunction prevention circuit (patent application No. 91-1839) of an instantaneous power failure of an electric washing machine filed by the same cause, by interrupting the power supply to the load in accordance with the presence or absence of the square wave input by the instantaneous power failure It is a device that compensates for unstable voltages caused by momentary power failures and allows the computer to operate by the compensated voltage.

Such conventional devices may allow a computer to operate normally by means of a compensated voltage.

However, the above-described conventional device exhibits its function only when the instantaneous voltage drop is completely made (i.e., 100% voltage drop). The instantaneous voltage drop of (where n is an integer) has a drawback in that the computer malfunction as described above cannot be prevented.

therefore, It is required to study the device to prevent the computer malfunction due to the instantaneous voltage drop.

In accordance with these requirements, the present invention is capable of providing 100% instantaneous voltage drop. It is an object of the present invention to provide an instantaneous power failure compensation device and a method of compensating for a home appliance that compensates a power supply so that a computer operates normally by detecting a momentary voltage drop.

According to one aspect of the present invention for achieving the above object, in the instantaneous power failure compensation device of a home appliance system having a load driver for controlling the driving of the load and a microcomputer for generating a predetermined control signal provided to the load driver ,

Conversion means for converting the line voltage of AC supplied to the load into a digital signal, line voltage identification means for comparing the digital signal with a first reference value set to a predetermined value and outputting a voltage dividing control signal of a predetermined level; The instantaneous voltage drop is detected by comparing the voltage dividing control means for dividing the line voltage provided to the conversion means to a predetermined voltage according to the level of the voltage dividing control signal, and the second reference value set to the predetermined value. Including a voltage drop detection means, it is characterized in that to provide a control signal to the load driving unit for shutting off the power supplied to the load when the instantaneous voltage drop is detected.

In the above configuration, the second reference value is set relatively less than the first reference value.

The voltage dividing control means is configured to divide the line voltage of the AC into 1/2 voltage.

According to another aspect of the present invention, in the instantaneous power failure compensation method of a home appliance having a load driver for controlling the driving of the load and a microcomputer for generating a predetermined control signal provided to the load driver,

Comparing the digital signal corresponding to the line voltage of the alternating current supplied to the load with a first reference value;

Outputting a signal having a predetermined level to divide the line voltage into a rated voltage according to the comparison result;

Comparing the digital signal with a second reference value corresponding to a forward voltage drop;

And outputting a predetermined control signal to the load driver according to the comparison result with the second reference value, and when the instantaneous voltage drop is detected, cut off the power supply to the load by the load driver. .

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

1 is a circuit diagram of a momentary power compensation device according to the present invention.

In FIG. 1, reference numeral 10 denotes a microcomputer that controls various functions of the household electrical appliance according to the procedure of a function execution program mounted in an internal memory (not shown), and reference numeral 20 denotes electrolysis with bridge diodes D1 to D4. It is a constant voltage part composed of capacitors CE1 ~ CE2 and constant voltage IC (integrated circuit) and receives constant AC voltage supplied to general homes to generate constant voltage, and reference numeral 30 denotes transistors TR1 to TR2 and resistors R1 to R5 and ceramic capacitor C1. When the initial voltage is applied from the constant voltage unit 20 as the configured reset unit, a reset signal of a predetermined pulse is generated.

When the reset signal provided from the collector of the transistor TR2 of the reset unit 30 is applied to the reset terminal Reset of the microcomputer 10, the microcomputer 10 initializes the internal registers and is set by the user. Set the procedure of the program that controls the function to the initial stage.

Since the technique of initializing the internal register for the microcomputer 10 to perform various functions by such a reset signal is already widely known as disclosed in Patent Application No. 91-1039, the above description is omitted.

Reference numeral 40 denotes a square wave generator composed of resistors R6 to R8, capacitor C2 and transistor TR3 to generate a square wave provided to the interrupt terminal INT of the microcomputer 10.

According to the presence of the square wave generated by the square wave generator 40, the microcomputer 10 can check whether there is an instantaneous power interruption, but the square wave is not generated when the voltage drop is completely performed, even when the voltage drops to a low voltage. The square wave is generated.

On the other hand, when the microcomputer 10 identifies that no square wave is generated, the computer 10 cuts off the power supply of the load by providing a predetermined control signal to the load driver 50.

However, the microcomputer 10 malfunctions as described above even when the voltage dropped below the predetermined voltage is applied, but the square wave generator for identifying the instantaneous power failure generates the square wave.

As described above, a technique of controlling a power supply of a load by identifying a momentary power interruption according to the presence or absence of a square wave has been disclosed in the aforementioned invention (No. 91-1039), but it performs its function only when a full voltage drop occurs. You can do it.

In addition to the conventional configuration including the square wave generator described above, an additional device configuration in the present invention converts the line voltage of the alternating current provided to the load into a digital signal and provides it to the input terminal I1 of the computer 10. And a voltage dividing control unit 70 for dividing the line voltage into half voltage according to the level of the signal provided from the output terminal O2 of the computer 10.

In addition, the function performed by the computer 10 is to compare the digital signal and the first reference value set to identify whether the line voltage is 110V or 220V to identify the magnitude of the line voltage and at the same time the magnitude of the line voltage Line voltage identification means for outputting a divided voltage control signal having a predetermined level, and a second reference value set for detecting an instantaneous voltage drop and a digital signal of the line voltage And an instantaneous voltage drop detecting means for identifying the instantaneous voltage drop of and outputting a predetermined load driving control signal to the load driver.

On the other hand, the square wave generator 40 is connected to one end of the secondary coil of the transformer TRS connected to the bridge diode of the constant voltage unit 20, so that the voltage from the primary coil of the transformer TRS to the secondary coil is increased. A square wave is generated by the sinusoidal signal generated when it is induced.

The waveform of the AC power source provided at both ends A and B of the primary coil is shown in FIG.

In FIG. 2 (a), the dotted waveform is or The voltage waveform of and the solid line waveform show the voltage waveform of 110V or 220V.

In addition, the voltage waveform induced at the both ends C and D of the secondary coil is a waveform of the state dropped to a predetermined voltage χV, and the dotted waveform is The voltage waveform of and the solid line waveform show the voltage waveform of χV.

In addition, the waveform of the voltage provided to the constant voltage IC 21, that is, the voltage XYV between the one output terminal E of the bridge diode and ground is shown in FIG. 2 (c). The voltage waveform of and the solid line waveform show the voltage waveform of yV.

On the other hand, the load driver 50 is composed of triac TRIAC, resistors R9 to R11, and transistor TR4, and controls the power supply and interruption to the load LOAD by a predetermined level signal output from the output terminal O1 of the computer 10. do.

In FIG. 2, (e) shows that no pulse is output as a waveform diagram of the signal generated at the output terminal F of the square wave generator 40 when 100% power failure occurs.

Not 100% instantaneous power failure In the case of a momentary power failure, which drops to, the dashed waveform voltage is induced at both ends of the transformer TRS, as shown in FIG.

The voltage of the dotted wave Because of the sinusoidal pie, the square wave generator 40 eventually generates a square wave.

But recall Even during a momentary power interruption, the computer 10 resets or becomes an error state in a state register (not shown) inside the computer, thereby causing a malfunction as described above.

remind When the computer 10 cuts off the power supply to the load by detecting the momentary power failure at the time of the voltage drop, the computer 10 is supplied with relatively stable power so that no malfunction occurs.

Thus, the interruption of the power supply to the load during instantaneous power failure and the supply of stable power to the computer at the same time are interpreted to mean that the power is compensated for in the present invention;

The present invention is not only 100% power failure It is to provide a device that detects a momentary power failure due to a voltage drop and then compensates the power to the computer.

The conversion unit 60 for converting AC line power supplied to the load into a predetermined digital signal includes a load resistor R12, a backflow preventing diode D5, a ripple control capacitor CE3 and CE, and an A / D for converting an analog signal into a digital signal. It consists of an analog to digital converter (ADC) and provides the converted digital signal to the input terminal I1 of the computer 10.

The voltage dividing unit 70 is a switching transistor connected to an input terminal of the A / D converter ADC for voltage dividing resistors R13 and R14 and a contact between the resistors R13 and R14 to control whether the voltage of the input terminal voltage is divided. TR5 and the load resistors R15 and R16 connected between the base of the transistor TR5 and the output terminal O2 of the computer 10.

Next, the operation of the line voltage identifying means and the instantaneous voltage drop detecting means performed by the computer 10 will be described in detail based on the flowchart of the momentary power interruption compensation routine shown in FIG.

When the computer 10 is initialized by the reset signal provided from the reset unit 30, the computer checks in step 101 whether the instantaneous power failure compensation routine is being performed for the first time.

If the compensation routine is to be performed for the first time, the control proceeds to the stem 102, and a high level first voltage control signal is output from the output terminal O2 of the computer, otherwise the control proceeds to step 105.

The high level voltage dividing control signal turns on the transistor TR5 of the voltage dividing controller 70, and at this time, the line voltage of the AC input to the A / D converter ADC of the conversion unit 60 is a resistor R13 and a transistor. Since it is grounded via TR5, a predetermined voltage is provided to the A / D converter ADC.

This voltage is converted into a digital signal by the A / D converter, and the computer 10 inputs the digital signal and compares it with the first reference value which is the voltage identification reference signal already set in step 103.

If the first reference value is larger than the input digital signal, the control proceeds to step 105; otherwise, the control proceeds to step 104.

In step 103, the computer 10 can identify that the line voltage is 110V to 120V if the first reference value is greater than the input digital signal, and the line voltage is 220V to 240V if the first reference value is less than the input digital signal. will be.

On the other hand, when the line voltage is 220 to 240 V, as shown in step 104, the first voltage divider control signal of the high level is continuously output from the output terminal O2 of the computer 10.

At this time, the switching transistor TR5 is continuously turned on so that a line voltage of a predetermined level is continuously provided to the A / D converter.

On the other hand, when the line voltage is 110 to 120V or when the instantaneous power failure compensation routine is not performed for the first time, the digital signal of the line voltage is at least at step 105. In order to detect the above instantaneous voltage drop, a comparison is made whether or not it is equal to or less than a second reference value that is already set.

If the second reference value is greater than the digital signal of the line voltage, the control proceeds to step 110 where the second voltage dividing control signal having a low level is provided to the voltage dividing unit 70.

The control proceeds to step 111 where the check bit for checking the performance of the momentary power failure function is set to one.

As such, when the second reference value is larger than the digital value of the line voltage, the computer 10 The check bit is set by identifying the power failure.

At this time, a predetermined control signal is provided to the load driver to cut off the power supply to the load.

On the other hand, if the second reference value is smaller than the digital value of the line voltage in step 105, the control proceeds to step 106, and the computer checks whether the momentary power failure function check bit is set.

If the check bit is set to 1, the control proceeds to step 108 to check whether the normal power is input for a predetermined time, and if the normal power is input for a predetermined time, proceed to step 109 and check Clear bit to 0.

If the check bit is not 1 and the check bit is cleared to 0, then the control proceeds to step 107 to control the load driver 50 to allow the load to operate normally and to perform other function control routines. do.

While repeating this process, the computer 10 checks the check bit of the function of the momentary power failure and cuts off the power supply to the load if it is set, and resumes supplying power to the load if it is cleared. do.

As in the present invention, the microcomputer 10 is usually When the above-mentioned instantaneous voltage drop occurs, the voltage drop can be detected by the square wave generator 40. The instantaneous voltage drop above or below can be detected.

As described above, the present invention detects the instantaneous power failure and cuts off the power provided to the load in order to prevent malfunction of the microcomputer when a commercial power supply is unstable and a momentary power failure occurs. We can expect the effect of compensating the power source to operate sufficiently.

In addition, in a system equipped with the microcomputer during instantaneous power failure, various problems caused by the malfunction of the microcomputer can be prevented by the apparatus of the present invention.

Claims (5)

1. An instantaneous power failure compensator of a home appliance having a load driver controlling a driving of a load and a microcomputer generating a predetermined control signal provided to the load driver, wherein the line voltage of AC supplied to the load is converted into a digital signal. A line voltage identification means for comparing the digital signal with a first reference value, which is a voltage identification reference value set to a predetermined value, to output a divided voltage control signal at a predetermined level, and the conversion means according to the level of the divided voltage control signal. A voltage dividing control means for dividing the line voltage provided to the predetermined voltage, and an instantaneous voltage drop detection means for detecting an instantaneous voltage drop by comparing the digital signal with a second reference value set to a predetermined value. When a drop is detected, a control signal is provided to the load driver to cut off the power supplied to the load. An apparatus for compensating for momentary power failure of a home appliance, and a method of compensating the same. The apparatus of claim 1, wherein the first reference value is set relatively less than the second reference value. The apparatus of claim 1, wherein the voltage dividing control means is configured to divide the line voltage of the AC into 1/2 voltage. The method of claim 1, wherein the second reference value is at least The momentary power outage compensator for home appliances, characterized in that set in response to the above-mentioned instantaneous voltage drop. A method for compensating instantaneous power failure of a home appliance having a load driver controlling a driving of a load and a microcomputer generating a predetermined control signal provided to the load driver, the digital signal corresponding to the line voltage of an alternating current supplied to the load. Is compared with a first reference value which is a voltage identification reference value, outputting a signal having a predetermined level for dividing the line voltage to a rated voltage according to the comparison result, and converting the digital signal corresponding to an instantaneous voltage drop. Comparing the second reference value and outputting a predetermined control signal to the load driver in accordance with the comparison result with the second reference value, when the instantaneous voltage drop is detected, the power to the load by the load driver Compensation method of the momentary power failure of the home appliance, characterized in that the supply is cut off.