Device for supplying warm water and method thereof

Abstract

Provided is a device for supplying warm water and a method thereof. The device for supplying warm water includes a first heater configured to have a first set capacity and heating received water, a second heater configured to have a second set capacity greater than the first set capacity and heating received water, and a control part calculating heater driving cycles of the first heater and the second heater according to a set water temperature, and driving the first heater and the second heater according to the heater driving cycles. The control part calculates the heater driving cycle of the first heater by using a phase control method, and calculates the heater driving cycle of the second heater by using a zero-crossing control method.

What is claimed is: 
     
         1 . A device for supplying warm water, the device comprising:
 a first heater configured to have a first set capacity and heating received water;   a second heater configured to have a second set capacity greater than the first set capacity and heating received water; and   a control part calculating heater driving cycles of the first heater and the second heater according to a set water temperature, and driving the first heater and the second heater according to the heater driving cycles,   wherein the control part calculates the heater driving cycle of the first heater by using a phase control method, and calculates the heater driving cycle of the second heater by using a zero-crossing control method.   
     
     
         2 . The device of  claim 1 , wherein the control part determines whether a temperature of water received in the first heater and the second heater is lower than the set water temperature, and calculates the heater driving cycles when the temperature of the received water is lower than the set water temperature. 
     
     
         3 . The device of  claim 1 , wherein the first set capacity is greater than zero and lower than 550 W, and the second set capacity is equal to or greater than 550 W and lower than 1250 W. 
     
     
         4 . A method of supplying warm water, the method comprising:
 preparing a first heater having a first set capacity, and a second heater having a second set capacity greater than the first set capacity;   calculating a heater driving cycle of the first heater according to a set water temperature by using a phase control method, while calculating a heater driving cycle of the second heater according to the set water temperature by using a zero-crossing control method; and   driving the first heater and the second heater according to the heater driving cycles to heat water received in the first heater and the second heater, and discharging the heated water.   
     
     
         5 . The method of  claim 4 , further comprising determining whether a temperature of the water received in the first heater and the second heater is lower than the set water temperature,
 wherein the heater driving cycles are calculated when the temperature of the water is lower than the set water temperature.   
     
     
         6 . The method of  claim 4 , wherein the first set capacity is greater than zero and lower than 550 W, and the second set capacity is equal to or greater than 550 W and lower than 1250 W. 
     
     
         7 . A method of supplying warm water, the method comprising:
 a preparation operation in which a first heater having a first set capacity, and a second heater having a second set capacity greater than the first set capacity are prepared;   an operation setting operation in which a set water temperature and set water quantity are input;   an operation preparation operation in which water is received in an amount equal to or greater than the set water quantity, it is determined whether to perform heating according to a temperature of the received water, and quantity of heat required for the heating is calculated; and   a control operation in which, when the heating is required, at least one of the first heater and the second heater is selected as a heater to be driven according to the required quantity of heat, a heater driving cycle of the selected heater is calculated, and the selected heater is driven according to the heater driving cycle,   wherein in the control operation, a heater driving cycle of the first heater is calculated by using a phase control method, and a heater driving cycle of the second heater is calculated by using a zero-crossing control method.   
     
     
         8 . The method of  claim 7 , wherein the control operation comprises a first control operation in which the first heater is selected as a heater to be driven when the required quantity of heat is less than the first set capacity, and the heater driving cycle of the first heater is calculated by using the phase control method to thereby drive the first heater. 
     
     
         9 . The method of  claim 7 , wherein the control operation comprises a second control operation in which the second heater is selected as a heater to be driven when the required quantity of heat is equal to or greater than the first set capacity and lower than the second set capacity, and the heater driving cycle of the second heater is calculated by using the zero-crossing control method to thereby drive the second heater. 
     
     
         10 . The method of  claim 7 , wherein the control operation comprises a third control operation in which the first heater and the second heater are selected as heaters to be driven when the required quantity of heat is equal to or greater than the second set capacity, the heater driving cycle of the first heater is calculated by using the phase control method to thereby drive the first heater, and the heater driving cycle of the second heater is calculated by using the zero-crossing control method to thereby drive the second heater. 
     
     
         11 . The method of  claim 10 , wherein, in the third control operation, the heater driving cycle of the second heater is calculated such that the second heater is driven by the second set capacity, and the heater driving cycle of the first heater is calculated such that the first heater is driven by a capacity obtained by subtracting the second set capacity from the required quantity of heat. 
     
     
         12 . The method of  claim 7 , wherein the operation preparation operation comprises:
 receiving water in an amount equal to or greater than the set water quantity;   measuring a water temperature of the received water;   calculating the required quantity of heat for heating when the measured water temperature is lower than the set water temperature; and   discharging water when the measured water temperature is equal to or higher than a preset temperature, and going into a standby state,   wherein the preset temperature is equal to or higher than the set water temperature, and   the measuring of the water temperature is performed again when the water temperature is equal to or higher than the set water temperature and lower than the preset temperature.   
     
     
         13 . The method of  claim 7 , wherein the first set capacity is greater than zero and lower than 550 W, and the second set capacity is equal to or greater than 550 W and lower than 1250 W.