KR101542497B1 - Apparatus and method for cutting off overvoltage of dryer - Google Patents

Abstract

The present invention relates to an over-voltage shut-off apparatus and method for a dryer, wherein the over-voltage shut-off method comprises the steps of: sensing a size of a power source supplied to the dryer; Comparing a magnitude of the sensed voltage with a reference value; And disconnecting the power supplied to the dryer when the detected voltage is greater than the reference voltage. Accordingly, when the humanized voltage is higher than the reference voltage, the power supplied to the clothes dryer is cut off, thereby preventing electrical damage or overheating of the power supply device or the heating device provided in the dryer .

Overvoltage shutdown, power conversion part, heater

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an overvoltage cut-

The present invention relates to an overvoltage shutoff apparatus and method for a dryer, and more particularly, to an overvoltage shutoff apparatus and method for shutting off a power supply to a clothes dryer when a voltage applied to a dryer is a voltage higher than a rated voltage.

BACKGROUND ART [0002] Generally, a clothes processing apparatus includes a washing machine, a clothes dryer, or a washing and drying machine having functions of washing and drying. The washing machine is a device for removing contaminants from contaminated laundry while washing, rinsing, And a rotatable tank installed inside the main body to store water and a rotatable tank rotatably installed in the reservoir. The laundry and the washing water are put into the rotary tub together with the detergent, and the rotary tub is rotated to apply a physical impact to the laundry to wash the laundry. In general, a washing machine is divided into two types depending on whether the rotary shaft of the rotary drum for treating laundry is divided into two types, that is, a washing machine with a vertical axis of rotation and a horizontal rotary shaft is called a drum washing machine .

The clothes dryer refers to a device for drying laundry by supplying washing water into the drum of the dryer after the washing process is finished and supplying the heated laundry to the drum to evaporate the moisture of the laundry. According to the structure of the dryer, the dryer includes a drum inside the dryer into which the laundry is introduced, a driving motor for driving the drum, a blowing fan for blowing air into the drum, and a heating means for heating the air flowing into the drum . The heating means may utilize the high-temperature electric resistance heat generated by using the electric resistance or the combustion heat generated by burning the gas.

And, in the dryer, the air leaving the drum has the moisture of the laundry in the drum, and the air becomes hot and humid. In this case, the dryer can be classified according to the method of treating the high temperature and high humidity air. Since the high temperature and high humidity air circulates without being discharged to the outside of the dryer, heat exchange with the outside air occurs in the condenser, A condensing dryer for condensing the air, and an exhaust dryer for discharging the hot and humid air passing through the drum directly to the outside.

Particularly, in case of a conventional electric dryer, when a phase voltage terminal of a power supply unit is erroneously connected to a power supply unit during installation, a transformer for converting an internal power supply can not withstand a high voltage and is burned or overheated thereby causing electric damage.

It is an object of the present invention to provide a power supply apparatus and a power supply apparatus capable of detecting a power supply before an electric or thermal damage to a circuit or a part inside the power supply apparatus is caused by an overvoltage, And to provide a device and method for overvoltage detection of a dryer that prevents circuits and parts from being damaged.

The over-voltage cut-off device of the dryer according to the embodiments of the present invention is a clothes dryer having a heater, comprising: a power source processor for converting a commercial voltage into a DC voltage; A switching unit for shutting off the power supplied to the heater according to the control signal; And a control unit for sensing the magnitude of the converted DC voltage and comparing the magnitude of the DC voltage with a reference value and outputting a control signal to the switching unit when the sensed DC voltage is greater than a reference value.

 The overvoltage cut-off device of the dryer includes a setting unit for setting the type of the dryer to which the overvoltage cut-off device is applied; It is possible to further include a type of the set dryer and a display unit for indicating that the dryer is cut off by the overvoltage input.

The switching unit cuts off the power supplied to the heater according to the control signal within a predetermined time from when the power is supplied to the dryer.

The power supply processing unit includes: a power conversion unit for reducing a commercial voltage; A DC power supply unit for converting an AC voltage into a rectified and DC voltage; And a voltage dividing unit for outputting the magnitude of the input DC voltage.

A method of overvoltage shutdown of a dryer according to embodiments of the present invention includes sensing a magnitude of a voltage supplied to a dryer; Comparing a magnitude of the sensed voltage with a reference value; And disconnecting the power supplied to the dryer when the sensed voltage is greater than the reference voltage.

The overvoltage shutdown method of the dryer may further include detecting the type of the drier.

Wherein the step of sensing the magnitude of the voltage comprises the steps of: initializing a value decayed for a predetermined time after power is supplied to the dryer; And a sensing step of sensing a size of the power source after the completion of the initialization step for a predetermined time, wherein the size of the power source is sensed after a predetermined time elapses after power is supplied to the dryer.

The step of disconnecting the power supply may include displaying a failure of the power supply unit for a predetermined time when the sensed power supply is greater than a reference value; And disconnecting the power supplied to the dryer after the lapse of the predetermined time.

The step of cutting off the power supply may cut off the power supply even when the detected size of the power supply is larger than the reference value when the detected dryer is not the electric dryer.

The apparatus and method for controlling the dewatering rate of a washing machine according to embodiments of the present invention are characterized in that, when the dryer is electrically dry, the circuit components of the power supply unit such as the power conversion unit are connected to the power terminals of the user or the installer by the overvoltage It is possible to prevent the heating device such as a heater from being overheated.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a configuration and operation according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view of a clothes dryer to which an embodiment of the present invention is applied, and FIG. 2 is a sectional view schematically showing an internal structure of FIG.

Referring to FIGS. 1 and 2, the dryer 100 includes a main body 102 constituting the outer shape of the main body 102. The main body 102 includes a main body 102, A filling port 104 is formed. The input port 104 is opened and closed by a door 106 and an operation panel 108 having various operation buttons for operating the dryer is positioned above the input port 104.

The dryer is provided with a drum 120 rotatably installed in the main body 102 so that the drying object can be dried therein, and the drum 120 is rotatably supported by the supporters at the front and rear. The drum 120 is connected to a driving motor 150 provided at a lower portion of the dryer by a power transmission belt 122 to receive a rotational force. A suction duct 130 is installed at the rear of the drum 120 and a heater 140 is installed at an inlet of the suction duct 130 to heat the air sucked. A filter 180 for filtering foreign substances such as lint contained in the air discharged from the drum 120 is provided in the front lower side of the drum 120. A duct 180 for completely discharging air to the outside of the dryer after filtering foreign matter (170, 190).

The ducts 170 and 190 are provided with a blowing fan 160 for blowing air in the drum 120 to the outside of the dryer. That is, one end of the duct 190 is connected to the outside of the main body 100 to guide the air blown by the blowing fan 160 to the outside of the dryer. The air blowing fan 160 shown in this embodiment is a full type blowing fan that exists on a duct through which the air is exhausted from the drum and sucks the air discharged from the drum toward the exhaust duct. However, depending on the configuration of the dryer, the air blowing fan may be positioned in the suction duct 130 to which the hot air is supplied to the drum, and the heated air inside the suction duct may be pushed into the drum.

The pulley formed on one side of the driving motor 150 is connected to a power transmission belt 122 for driving the drum and a driving shaft of a blowing fan is connected to the other side of the driving motor 150, It is connected.

FIG. 3 is a block diagram of an overvoltage cut-off device of a dryer according to an embodiment of the present invention. FIG. 4 illustrates a power sensing unit of FIG. 3, Circuit.

Referring to FIG. 3, an over-voltage cut-off device 200 of a dryer according to an embodiment of the present invention includes a heater, a power source processor 250 for converting a commercial voltage into a DC voltage, A switching unit 240 for shutting off the power supplied to the heater according to the control signal; The control unit 210 senses the magnitude of the converted DC voltage and compares the magnitude of the DC voltage with a reference value and outputs a control signal to the switching unit when the sensed DC voltage is greater than a reference value.

A setting unit 220 for setting the type of the drier to which the overvoltage cut-off device 200 is applied; And a display unit 260 for indicating that the type of the set dryer and the dryer are blocked by the high voltage input.

The setting unit 220 is used to indicate that the clothes dryer to which the overvoltage detection device of the present invention is applied is an electric clothes dryer, and the manufacturer may implement an optional resistor or dip switch. Therefore, in the case where the present invention is applied only to the electric clothes dryer, the setting unit 220 may be omitted.

When power is applied to the clothes dryer, a commercial power source of 220 V or 110 V is supplied to the power source processor 250 through the switching unit 240. In the power source processor 250, The voltage is lowered by the power conversion unit 251 to the DC power supply unit 252 and the voltage distribution unit 253 facilitates the process by the control unit 210. [

The power conversion unit 251 converts a high voltage of a commercial power supply into a low voltage, and is implemented as a transformer in this embodiment. The transformer transforms only the size of the commercial power applied to the primary and transmits it to the secondary. That is, since the power supplied to the primary side of the power conversion unit 251 is an AC voltage, the voltage output from the secondary side of the power conversion unit 251 is also a reduced AC voltage.

The DC power supply unit 252 receives the AC voltage through the power conversion unit 251 and outputs a DC voltage using a rectification circuit and a smoothing circuit provided therein. 5, the DC power supply 252 outputs a DC voltage of 16 [V], receives the voltage of 16 [V], and outputs a stable voltage of 12 [V] Respectively.

A voltage of 16 V, which is the same as the output of the smoothing circuit, is applied to the right capacitor C2 shown in FIG. 5, and the constant voltage IC 255, to which the voltage is applied, So that the voltage of the power source is stably maintained.

The voltage distribution unit 253 lowers the output voltage of the DC power supply unit 252 to an appropriate voltage for processing the data by the control unit 210 and supplies the voltage to the control unit 210. [ As shown in FIG. 4, the voltage distributor 253 distributes the output voltage of the DC power supply 252 by using the resistors R1 and R2. Alternatively, it is also possible to sense the voltage using an OP-amp or comparator circuit.

The switching unit 240 may be implemented as an electronic switching device such as a relay device or a power transistor. In this embodiment, a relay is used.

The controller 210 controls the switching unit 240 to shut off the commercial power when the voltage sensed through the voltage distributor 253 is 150% or more of the rated voltage. The switching unit may be implemented as an electronic switching device such as a relay device or a power transistor. In this embodiment, a relay is used.

More specifically, when it is determined that the sensed voltage is equal to or higher than 150% of the rated voltage, the controller 210 controls the supply of power to the heater 270 or the power conversion unit 251 The switching unit 240 is controlled within 20 seconds.

Particularly, in this embodiment, when the clothes dryer is three-phase electric type, the circuit components of the power supply unit such as the power conversion unit 251 are burned or ignited due to overvoltage due to erroneous connection between the user and the installer during installation, Can be prevented from being overheated.

The display unit 260 indicates to the user or the administrator that the power supply is shut down due to a defect in the power supply unit when the power supply is cut off due to mis-wiring or the like as described above. As a result, the user or the administrator can know the cause of the power-off, thereby solving the trouble or knowing the cause of the trouble, thereby providing the user with usability.

FIG. 6 is a flowchart illustrating a control method of the overvoltage cut-off method of the dryer according to the embodiment of the present invention.

Referring to FIG. 6, a method of overvoltage shutdown of a dryer according to an embodiment of the present invention includes: sensing a magnitude of a voltage supplied to a dryer (S30); Comparing a magnitude of the sensed voltage with a reference value (S40); And disconnecting the power supplied to the dryer when the sensed voltage is greater than the reference voltage (S60).

The overvoltage shutdown method of the dryer may further include a step S10 of detecting the type of the dryer.

In the step S10 of sensing the type of dryer, it is determined whether the clothes dryer is an electric dryer, and it is determined according to the state of the option resistor detected by sensing the state of the optional resistor set by the manufacturer. Therefore, when the present invention is applied only to the electric clothes dryer, the step of sensing the type of the dryer is not necessarily performed.

More specifically, in the step of detecting the dryer type (S10), it is determined whether the dryer is a three-phase electric dryer (S20). If it is determined that the dryer is an electric dryer, a step S30 However, if the dryer is not the electric dryer, the drying process is performed. (S70)

In the step S30 of detecting the size of the power source, the size of the power source is sensed after a predetermined time has elapsed after power is supplied to the clothes dryer. More specifically, the controller senses the power for 10 seconds from the power-on, initializes the power-sensing unit 270 from 6 seconds to 6 seconds after the power is applied to the dryer, Per second.

If the sensed voltage is greater than the reference value, the control unit 210 displays a failure of the power supply unit and disconnects the power supplied to the dryer (S50, S60). (S70). If the answer is YES,

More specifically, if the sensed voltage is equal to or more than 150% of the reference voltage, the failure of the power supply unit is displayed on the display unit 290 until the commercial power supply is shut off (S50). It is also possible to use a warning sound or a voice message such as a buzzer sound as well as a message. The control unit 210 turns off the power source by turning off the switching unit 240 at a lapse of 20 seconds from when the user applies power to the clothes dryer to shut off the commercial power supplied to the clothes dryer . (S60)

Although the present invention has been described in detail with reference to the embodiments of the present invention and the accompanying drawings by way of example of a condensable clothes dryer, the present invention can be applied to an exhaust type clothes dryer or the like. Further, the scope of the present invention is not limited by the above embodiments and drawings, and the scope of the present invention will be limited only by the content of the following claims.

1 is a perspective view of an electric dryer to which an embodiment of the present invention is applied.

2 is a side cross-sectional view of the electric dryer of FIG.

3 is a block diagram of an overvoltage cut-off device of a dryer according to an embodiment of the present invention.

4 is a voltage distribution circuit diagram used in an embodiment of the detection unit of FIG.

5 is a circuit diagram of a constant voltage source provided in the DC power source unit of FIG.

6 is a control flowchart of the overvoltage cutoff method of the dryer according to the embodiment of the present invention.

Claims (12)

A clothes dryer having a heater, A power processor for converting a commercial voltage into a DC voltage; A switching unit for shutting off the power supplied to the heater according to the control signal; And a control unit for sensing the magnitude of the converted DC voltage and comparing the magnitude of the DC voltage with a reference value and outputting a control signal to the switching unit when the sensed DC voltage is greater than a reference value, Wherein the switching unit is configured to shut off the power supplied to the heater according to the control signal within a predetermined time from when the power is supplied to the dryer when the sensed DC voltage is greater than the reference value, Device. The method according to claim 1, A setting unit for setting the type of the drier to which the overvoltage cut-off device is applied; Further comprising a display unit for indicating that the type of the set dryer and the dryer have been cut off by the overvoltage input. delete The method of claim 1, wherein The power supply processing unit includes: a power conversion unit for reducing a commercial voltage; A DC power supply unit for converting an AC voltage into a rectified and DC voltage; And a voltage dividing unit for lowering the magnitude of the input DC voltage and outputting the reduced DC voltage. Sensing a magnitude of a voltage supplied to the dryer; Comparing the magnitude of the sensed voltage with a reference value; And disconnecting the power supplied to the dryer when the sensed voltage is greater than the reference voltage, The step of disconnecting the power supply may include: A display step of displaying a failure of the power supply unit for a predetermined time when the sensed power supply is larger than a reference value; And disconnecting the power supplied to the dryer after the predetermined time elapses. 6. The method of claim 5, Further comprising sensing the type of the dryer. ≪ RTI ID = 0.0 > 11. < / RTI > 6. The method of claim 5, Wherein the step of sensing the magnitude of the voltage senses the magnitude of the power source after a predetermined time has elapsed since power was supplied to the dryer. 8. The method of claim 7, Wherein the step of sensing the magnitude of the voltage comprises the steps of: initializing a sensed value for a predetermined time after power is supplied to the dryer; And a sensing step of sensing the size of the power source for a preset time after the completion of the initialization step. delete 6. The method of claim 5, Wherein the step of shutting off the power supply cuts off the power supply when the size of the detected power supply is equal to or greater than a predetermined ratio of the rated voltage. 6. The method of claim 5, Wherein the step of shutting off the power supply does not shut off the power supply even if the detected size of the power supply is larger than a reference value when the detected dryer is not an electric dryer. 6. The method of claim 5, Wherein the step of sensing the size of the power source senses the size of the power source for a first time from the power supply, and the step of shutting off the power source includes a step of receiving a control signal within a second time longer than the first time And then the power supplied to the heater is cut off.

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