KR20080085396A - Detecting apparatus for input voltage - Google Patents

Abstract

A device for detecting an input voltage is provided to prevent interference by direct current when detecting alternating common power. A device for detecting input voltage comprises a phase control unit, a voltage detecting unit(100), and a system microprocessor(50). The phase control unit applies alternating current to a motor voltage unit(78) in accordance with a control signal. The voltage detecting unit rectifies and smoothes the alternating current. The system microprocessor determines the intensity of alternating current according to the rectified voltage.

Description

Input voltage detection device {DETECTING APPARATUS FOR INPUT VOLTAGE}

1 is a cross-sectional view of a drum washing machine to which the present invention is applied.

2 is a block diagram of a control apparatus of a drum washing machine equipped with an input voltage sensing device according to the present invention.

3 is a detailed configuration diagram of the voltage detection unit of FIG. 2.

<Description of the symbols for the main parts of the drawings>

1: drum washing machine 8: drum

12: drive motor 100: voltage detection unit

The present invention relates to an input voltage sensing device, and more particularly, to an input voltage sensing device for accurately detecting an input voltage in an electric device using a universal motor.

In general, a drum washing machine is a device that allows washing to be performed by using a friction force of a rotating laundry drum and a laundry by receiving a driving force of a driving unit while detergent, washing water, and laundry are put into a washing drum. If it doesn't get tangled up, tap and rub to create a laundry effect.

Looking at the operation of the general drum washing machine configured as described above are as follows.

First, after the door is opened, the laundry cloth is put into the drum through the laundry cloth entrance, and after the door is closed and the laundry cloth entrance is sealed, the detergent is supplied to the detergent supply device according to the type and quantity of the laundry cloth put into the drum. Is committed.

When the drum washing machine is operated, the quantity of the laundry cloth put into the drum is sensed, and a washing method such as a washing course, a washing time, a water level, a detergent amount, etc. is set according to the detected quantity. It works. That is, the water is supplied to the inside of the tub by the water supply device, and the detergent introduced into the detergent supply device is supplied into the tub in a state of being mixed with the water supplied by the water supply device.

 If the drum is rotated by the motor after the wash water is stored in the tub to the predetermined level, the laundry cloth is lifted up to a certain height by the lifter installed in the drum and then dropped by gravity, and the laundry cloth is dropped by the interaction between the free fall force and the wash water. Contamination is eliminated.

When the washing stroke is completed, the contaminated washing water in the tub is drained out of the washing machine through the drainage device.

Thereafter, the drum washing machine is subjected to several rinsing strokes to rinse the remaining foam in the laundry cloth. That is, clean water is supplied to the inside of the tub to a predetermined level by the water supply device, the washing cloth is rinsed while the drum is rotated by the motor, and the rinsed water is drained to the outside through the drainage device.

When several rinsing strokes are completed as described above, the drum is rotated at a high speed by the motor to completely centrifuge the water of the laundry cloth, and in the case of the drum washing machine equipped with a drying apparatus, the drying stroke is also performed.

At the time of output control of a motor (for example, a universal motor) to be applied as a drive device such as a drum washing machine, the system microcomputer generates a speed control signal for controlling the output of the motor and performs control. However, if there is a variation in the magnitude of the voltage applied to the motor, since it is difficult to achieve accurate control, a separate input voltage sensing device is required. In the conventional input voltage sensing device, after reducing the AC commercial power input using a linear trnsformer, rectifying and smoothing the AC commercial power to calculate the size of the AC commercial power according to the magnitude of the generated DC voltage. In the conventional input voltage sensing device, since the variation of the output voltage is considerably large with respect to the input of the AC commercial power having the voltage variation specification of the linear transformer used being ± 10% or more, it is possible to accurately detect the size of the AC commercial power supply. It is difficult. In addition, due to the incorrect sensing of the AC commercial power supply, the control system may malfunction.

In order to solve this problem, it is an object of the present invention to provide an input voltage sensing device that detects only the magnitude of the AC commercial power input without depending on the voltage fluctuation standard of the device.

In addition, an object of the present invention is to provide an input voltage sensing device capable of detecting the magnitude of the AC commercial power input before applying a voltage to the motor, to generate and apply an accurate speed control signal to the motor.

It is also an object of the present invention to provide an input voltage sensing device that blocks interference from a direct current voltage when sensing an AC commercial power supply.

In the following, the invention is explained in detail based on the embodiments of the invention and the accompanying drawings.

1 is a cross-sectional view of a drum washing machine to which the present invention is applied. As shown in FIG. 1, the drum washing machine 1 can be buffered by a cabinet 2 forming an exterior of the drum washing machine 1, and a spring 3 and a damper 4 inside the cabinet 2. The tub 6, the drum 8 rotatably disposed inside the tub 6 and having a hand 8A formed on the outer circumferential surface thereof, and the drum 8 installed on the inner surface of the drum 8 by gravity at a predetermined height. A plurality of lifters 10 for pumping the laundry so that the laundry falls, a drive motor 12 provided at the rear of the tub 6, and a drive motor 12 installed between the drive motor 12 and the drum 8. It comprises a power transmission mechanism 40 for transmitting the power of the drum (8).

Here, a cabinet cover 14 having a laundry entrance 14A formed at the center of the cabinet 2 may be mounted on the front surface of the cabinet 2 to open and close the laundry entrance 14A at the cabinet cover 14. The door 16 is rotatably installed so that it may rotate.

In addition, a water supply device 20 for supplying the washing water to the tub 6 is installed above the tub 6, and below the tub 6 to discharge the washing water stored in the tub 6 to the outside. Drainage 30 for is installed.

The water supply device 20 includes a water supply valve 22 for intermitting water flowing into the drum washing machine 1, a water supply hose 24 connecting the water supply valve 22 and the tub 6, and a water supply hose. It is installed in communication with one side of the 24 is composed of a detergent supply device 26 for supplying detergent to the tub (6).

The drainage device 30 includes a drain pump 32 for pumping the wash water stored in the tub 6 and a drain hose 34 for guiding the wash water pumped by the drain pump 32 to the outside of the cabinet 2. It consists of.

In addition, the power transmission mechanism 40 includes a motor pulley 42 fixed to the rotary shaft 13 of the drive motor 12, a drum pulley 44 fixed to the rotary shaft 9 of the drum 8, and a drum pulley. And a belt 46 for interlocking the 44 with the motor pulley 42. The motor pulley 42 is formed in a cylindrical shape with a hollow inside and is fixed to an end portion of the rotation shaft 13 of the driving motor 12, and the drum pulley 44 is disposed through the rear surface of the tub 6 with a drum ( 8) is fixed to the end of the rotating shaft (9).

As the driving motor 12 is driven, the motor pulley 42 and the drum pulley 44 are interlocked by the belt 46 to transmit the driving force of the driving motor 12 to the drum 8.

The sensor (not shown) attached to one side of the drive motor 12 continuously detects the number of revolutions of the drive motor 12 and transmits it to the system microcomputer (or control unit) (not shown), and the system microcomputer drives the motor. The rotation speed (rpm) is calculated according to the rotation speed of (12).

2 is a block diagram of a control apparatus of a drum washing machine equipped with an input voltage sensing device according to the present invention.

In FIG. 2, when the user selects and inputs a desired washing course (for example, a washing stroke or a dehydration stroke), the driving unit 80 outputs an electric key signal corresponding thereto, and the speed detecting unit 90 The speed of the driving motor (for example, the universal motor) 12 is sensed and a corresponding speed detection signal is output. The speed sensing unit 90 may be formed of, for example, a hall sensor.

In addition, the system microcomputer 50 controls the overall operation of the drum washing machine, and determines the speed control signal for adjusting the speed of the drive motor 12 (or the speed of the drum 8) and the drive motor 12. And outputs a switching control signal for reverse rotation, and the triac 72 is turned on or off by the speed control signal from the system microcomputer 50 to supply or cut off the commercial AC power from the power supply unit 60. This speed control signal consists of a pulse width modulation (PWM) signal.

Then, the first relay 74 and the second relay 76 are switched by the switching control signal from the system microcomputer 50 to rotate the drive motor 12 forward and reverse, and the power supply unit 60 is a drum washing machine. Supply commercial AC power required to drive the engine.

In addition, the rectifying unit 78 (that is, the motor voltage unit) rectifies the DC voltage from the commercial AC power input from the power supply unit 60, and the driving motor 12 is driven by receiving a predetermined DC voltage from the rectifying unit 78. By rotating the drum 8 forward and reverse, it consists of a rotor 12a and a stator 12b.

The controller of the drum washing machine configured as described above inputs a desired washing course (for example, a dehydration stroke) through the driving control unit 80, and then operates the start key. The key signal is output to the system microcomputer 50.

The system microcomputer 50 receives a key signal and outputs a speed control signal for adjusting the speed of the drive motor 12 (or the speed of the drum 8) to the triac 72 and at the same time the drive motor 12. Outputs a switching control signal for forward rotation to the first and second relays 76, respectively, and the triac 72 is turned on by the speed control signal so that the commercial AC power supply from the power supply unit 60 is rectified. ), The first and second relays 76 are switched to the terminal A by the switching control signal, and the second relay 76 is switched to the D terminal.

Next, the rectifier 78 rectifies and outputs a commercial AC power supply with a DC voltage, and the DC voltage of the drive motor 12 passes through the A terminal of the first relay 74 and the D terminal of the second relay 76. The drive motor 12 is driven in the forward rotation as the rotor 12a and the stator 12b are supplied, and as the drive motor 12 is driven in the forward rotation, the drum 8 rotates forward to perform a dehydration stroke. .

On the other hand, when the system microcomputer 50 outputs the switching control signals for the reverse rotation of the drive motor 12 to the first and second relays 76, respectively, the first and second relays 76 output the switching control signals. By this, the first relay 74 is switched to the B terminal, and the second relay 76 is switched to the C terminal.

Next, the DC voltage rectified by the rectifying unit 78 passes through the B terminal of the first relay 74 and the C terminal of the second relay 76 to the rotor 12a and the stator 12b of the drive motor 12. As it is supplied to the drive motor 12 is driven in reverse rotation, as the drive motor 12 is driven in reverse rotation the drum 8 is rotated in reverse to perform a dehydration stroke.

In addition, the speed detection unit 90 detects the speed (speed) of the driving motor 12 and outputs a corresponding speed detection signal to the system microcomputer 50, and the system microcomputer 50 receives the speed detection signal. The speed control signal for adjusting the speed of the drive motor 12 is output to the triac 72.

Next, the triac 72 is turned on or off by the speed control signal so that the phase of the commercial AC power is controlled as the commercial AC power from the power supply 60 is supplied or cut off to the rectifier 78. The drive motor 12 is driven to regulate the speed of the drum 8.

The system microcomputer 50 controls the speed of the drive motor 12 according to a pre-stored washing or dehydration stroke algorithm, but also takes into account the amount of load in the drum 8. In addition, the system microcomputer 50 senses the magnitude of the AC power (ie, AC commercial power) applied to the drive motor 12 to be used for controlling the drive motor 12.

The system microcomputer 50 receives the DC voltage from the voltage sensing unit 100 that detects the magnitude of the AC voltage (or AC power) applied to the rectifying unit 78 of the driving motor 12. Calculate

The input voltage sensing device according to the present invention preferentially includes a DC voltage blocking means so that the voltage sensing unit 100 can detect a magnitude of only an AC voltage. As the DC voltage blocking means, a capacitor C1 connected at both ends to the power supply 60, a resistor R1 and a capacitor C2 connected in parallel to the rectifier 78 are provided. First, the capacitor C1 removes a DC voltage component included in an AC voltage applied from the outside, so that only the AC voltage is applied to the rectifier 78 and the voltage detector 100.

In addition, the resistor R1 and the capacitor C2 block the DC voltage that may be applied from the rectifier 78 (particularly, when the triac 72 is turned off) to the voltage sensing unit 100. That is, the resistor R1 and the capacitor C2 allow only the AC voltage of the power source 60 to be applied to the voltage sensing unit 100.

In addition, the input voltage sensing device senses an AC voltage applied to the rectifying unit 78 of the driving motor 12 only when the voltage supply to the driving motor 12 is turned off, and when the driving motor 12 is driven, Do not have any effect. For this operation, the voltage sensing unit 100 is connected to the node (A). When the system microcomputer 50 applies the speed control signal for the on-operation to the triac 72, the AC voltage from the power supply 60 is a direct current at the capacitor C1 (and resistor R1 and capacitor C2). The voltage component is removed and applied to the rectifier 78 to drive the drive motor 12. At this time, the AC voltage is not applied to the voltage sensing unit 100.

Next, when the system microcomputer 50 applies the speed control signal for the off operation to the triac 72, the AC voltage from the power supply 60 is applied only to the voltage sensing unit 100, and to the rectifying unit 78. Not authorized In addition, the DC voltage from the rectifier 78 is cut off by the resistor R1 and the capacitor C2, so that the voltage detector 100 detects only the AC voltage from the power supply 60.

Since the system microcomputer 50 uses a PWM signal for controlling the triac 72, the PWM signal becomes a signal including an on signal and an off signal. Therefore, when the system microcomputer 50 applies the speed control signal consisting of a PWM signal to the triac 72 to control the voltage, the voltage sensing unit 100 performs an AC voltage sensing operation. That is, the system microcomputer 50 may control the operation of the voltage sensing unit 100, and even if the AC voltage is sensed when the triac 72 is turned off, the on and off of the triac 72 is continuous. Therefore, even when the voltage sensing unit 100 senses an AC voltage only when the triac 72 is off, the magnitude of the AC power supplied from the power source 60 can be calculated relatively accurately.

3 is a detailed configuration diagram of the voltage sensing unit of FIG. 2.

As shown in FIG. 3, the voltage sensing unit 100 includes a resistor R2 connected in series to the node A, a resistor R3 having one end connected to the resistor R2 and the other end grounded, and one end thereof. A voltage divider comprising a resistor R4 connected to one end of the resistor R3 through the diode D1 and grounded at the other end thereof; a diode D1 rectifying the AC voltage divided by the voltage divider; The capacitor C3 smoothes the AC voltage. The voltage detector 100 applies a sense signal that is a smooth AC voltage to the system microcomputer 50.

In detail, when the triac 72 is turned off, the voltage divider resistor receives the AC voltage of the power supply 60. The voltage divider consists of a resistor R2 and a resistor Rp (parallel resistors of the resistors R3 and R4), so that only an AC voltage applied to the resistor Rp is applied through the diode D1. The voltage dividing resistor unit reduces the AC voltage (for example, 220V) applied from the power supply 60 to a low AC voltage (for example, about 10V).

The diode D1 rectifies the reduced AC voltage. That is, the diode D1 performs half-wave rectification and applies the rectified AC voltage to the capacitor C3.

When the triac 72 is turned off, the capacitor C3 is charged by receiving a rectified AC voltage through the diode D1, and the voltage charged in the capacitor C3 is sensed by the system microcomputer 50. During this charging, the charging time constant is determined by the capacitor C3 and the resistor Rp in accordance with the application path of the rectified AC voltage. In order to sense the voltage quickly, the charging time constant should be set as small as possible, so that a small capacity capacitor C3 is used.

When the triac 72 is turned on, the AC voltage from the power source 60 is not applied to the voltage sensing unit 100, and the voltage charged in the capacitor C3 is discharged. Since the discharged voltage is not applied through the diode D1, but is applied to the resistor R4, the applied AC voltage is sensed by the system microcomputer 50. At the time of discharge, the discharge time constant is determined by the capacitor C3 and the resistor R4 in accordance with the path of the discharge voltage. The system microcomputer 50 should be large so that the discharge time constant may be detected so as to sense the discharge voltage close to the charged voltage. Accordingly, the discharge time constant is increased to maximize the value of the resistor R4 in order to minimize the discharge speed.

The system microcomputer 50 calculates the magnitude of the AC voltage of the power source 60 according to the magnitude of the charge voltage and the discharge voltage from the voltage detector 100. That is, the voltage divided by the voltage dividing resistor described above is taken into consideration, and the voltage drop by the diode D1 is also taken into consideration and calculated. Since the process of calculating the voltage is only easily recognized by those familiar with the art to which the present invention pertains, a detailed description thereof will be omitted. Thus, since the system microcomputer 50 accurately detects the magnitude of the AC voltage of the power supply 60, accurate speed control of the driving motor 12 is possible.

The voltage sensing unit 100 receives an AC voltage only when the triac 72 is turned off, but is charged when the AC voltage is applied, and discharges when the AC voltage is not applied. Irrespective of the on / off of 72, the AC voltage of the power supply 60 is accurately calculated.

However, the scope of the present invention is not limited by the above embodiments and drawings.

In the following, various aspects of the claimable invention are described. The following description forms part of a detailed description of the invention, and is a minimum of examples of the technical idea of the present invention or of a method of controlling a drum washing machine according to the present invention, which can be understood from various points of view. It should be understood as a description and not as a boundary limiting the present invention.

The input voltage sensing device of the present invention according to claim 1 of the present invention includes a phase control unit applying an AC voltage to a motor voltage unit according to a control signal, a voltage sensing unit rectified and smoothed by receiving an AC voltage, and a rectified voltage. In accordance with the calculation unit for calculating the magnitude of the AC voltage, the AC voltage to calculate the magnitude of the AC voltage without using a linear transformer.

The voltage sensing unit according to claim 2 is applied when the AC voltage to the motor voltage unit is stopped, so that the AC voltage is sensed without affecting the driving of the motor.

The voltage sensing unit according to claim 3 of the claim is divided into a voltage divider consisting of a first resistor and a second resistor for dividing an applied AC voltage, a diode connected to a cathode to rectify the divided AC voltage, and rectified A smoothing part that smoothes the AC voltage, divides the AC voltage, rectifies and smoothes the divided AC voltage to calculate the AC voltage.

The smoothing part according to claim 4 of the present invention comprises a capacitor connected in parallel to the cathode of the diode and a third resistor, so that the voltage charged with only the third resistor is applied when the capacitor is discharged, so that the calculating part is charged. Make sure you sense the voltage.

The phase control unit according to claim 5 of the claims is connected to a first DC blocking unit connected in parallel with an AC voltage, one end of the first DC blocking unit and the first input of the motor voltage unit, and the second end of the motor voltage unit. And a triac connected between the second DC blocking unit connected to the input, the other end of the first DC blocking unit, and the other end of the second DC blocking unit, and the input terminal of the voltage sensing unit is the other end of the second DC blocking unit, and the voltage sensing unit Only the AC voltage is sensed when the triac is turned off.

The first and second direct current cut-off portions according to claim 6 at the time of filing include a capacitor.

An input voltage sensing device according to the present invention according to claim 7 applies an AC voltage to a motor voltage part according to a motor on signal, and applies a voltage input part to an AC voltage to a voltage sensing part according to a motor off signal. And a motor voltage unit for driving the motor, a voltage detector for generating a detection signal corresponding to the applied AC voltage, and a controller for calculating the magnitude of the AC voltage corresponding to the generated detection signal. The voltage is sensed so that it does not affect the driving of the motor.

The voltage sensing unit according to claim 8 of the patent application rectifies and smoothes the AC voltage to generate a detection signal.

When applying, the voltage input unit according to claim 9 includes a DC blocking unit for blocking a DC voltage included in an AC voltage, so as to detect only an AC voltage.

When applying, the voltage sensing unit according to claim 10 includes a voltage divider so that a detection signal for a lowered AC voltage is applied to the control unit.

The present invention having such a configuration has an effect of detecting only the magnitude of the AC commercial power input without depending on the voltage variation specification of the device.

In addition, the present invention has the effect of detecting the magnitude of the AC commercial power input before applying the voltage to the motor, so that the system micom generates and applies an accurate speed control signal to the motor.

In addition, the present invention, when the detection of the AC commercial power supply, the interference from the DC voltage is cut off, so that the accurate detection of the AC commercial power supply is made.

Claims (10)

A phase controller for applying an AC voltage to the motor voltage unit according to the control signal; A voltage sensing unit rectified and smoothed by receiving an AC voltage; Input voltage sensing device, characterized in that consisting of a calculation unit for calculating the magnitude of the AC voltage in accordance with the rectified voltage. The method of claim 1, The voltage sensing unit is characterized in that the AC voltage is applied when the application of the AC voltage to the motor voltage unit is stopped. The method of claim 1, The voltage sensing unit includes a voltage divider including a first resistor and a second resistor for dividing an applied AC voltage, a diode connected to a cathode to rectify the divided AC voltage, and a smoothing unit for smoothing the rectified AC voltage. Input voltage sensing device characterized in that. The method of claim 3, The smoothing unit comprises a capacitor connected in parallel to the cathode of the diode, and an input voltage sensing device, characterized in that the third resistor. The method of claim 1, The phase controller includes a first DC blocking unit connected in parallel with an AC voltage, a second DC blocking unit connected at one end to a first input of the first DC blocking unit and a first input of the motor voltage unit, and connected to a second input of the motor voltage unit at the other end thereof. And a triac connected between the other end of the first DC blocking unit and the other end of the second DC blocking unit, wherein the input terminal of the voltage sensing unit is connected to the other end of the second DC blocking unit. The method of claim 5, The first and second DC blocking unit comprises a capacitor. A voltage input unit applying an AC voltage to the motor voltage unit according to the motor on signal and applying an AC voltage to the voltage sensing unit according to the motor off signal; A motor voltage unit which drives the motor by an AC voltage; A voltage sensing unit generating a sensing signal corresponding to an applied AC voltage; The input voltage sensing device, characterized in that consisting of a control unit for calculating the magnitude of the AC voltage corresponding to the generated detection signal. The method of claim 7, wherein The voltage sensing unit rectifies and smoothes the AC voltage to generate a sensing signal. The method of claim 9, Input voltage sensing device, characterized in that the voltage input unit comprises a DC blocking unit for blocking the DC voltage contained in the AC voltage. The method of claim 7, wherein The voltage sensing unit comprises a voltage divider.

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