Heating control method of electric water heater

An electric water heater, heating control technology, applied in the direction of electrical program control, fluid heaters, lighting and heating equipment, etc., can solve the problem of power interruption, etc., to achieve the effect of energy saving and continuous heating

Active Publication Date: 2008-10-01
SHENZHEN CRASTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of cutting off the power supply by bimetal deformation is that in some cases, the user needs to continue heating the water in the electric water heater with a suitable power for a period of time after boiling, so as to meet different purposes.
However, at present,

Method used

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  • Heating control method of electric water heater

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Embodiment 1, for a medium-power electric water heater, 2000w, a thermistor NTc with a negative temperature coefficient is set in the electric water heater, the microprocessor CPU has multiple A / D conversions, and the control circuit is a transistor connected to the output port of the microprocessor , turn on the power, the sensor detects the temperature related to the water temperature in the electric water heater in real time, and when its temperature is greater than the initial temperature of the calculated temperature change by 60°C, it starts to calculate the temperature change rate, and stores the temperature and the calculated temperature change rate, cycle Set to 8 seconds, the microprocessor calculates the water temperature change rate: it represents the A / D conversion digital quantity related to the water temperature in the first 8 seconds at that time as the subtrahend, and represents the current A / D conversion digital quantity related to the water temperature ...

Embodiment 2

[0024] Example 2, the water temperature change rate before boiling is 2 degrees / second, if the full power is still 2000W, then the average power to keep the boiling state after boiling is 500W, if 8 seconds is a cycle, then turn on for 2 seconds and turn off for 6 seconds Achieving an average power of 500W. The control circuit switches the heating power and continues heating until the specified time, the program returns to the initial state, and the rate of change and intermediate calculation results are cleared.

Embodiment 3

[0025] Embodiment 3, for the electric water heater whose water temperature rises slowly, the power is relatively small, which is 1600w, the thermistor NTC with negative temperature coefficient is set in the electric water heater, the microprocessor CPU has multiple A / D conversion, and the control circuit is a microprocessor The transistor connected to the output port of the water heater is turned on, and the sensor detects the temperature of the water in the electric water heater in real time. When the temperature is greater than the initial temperature of 55°C for calculating the temperature change rate, the temperature change rate is calculated, and the temperature and the calculated temperature are stored. Temperature change rate, the period is set to 8 seconds, the microprocessor calculates the water temperature change rate: the digital quantity representing the water temperature in the first 8 seconds is the subtrahend, the digital quantity representing the current water te...

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Abstract

The present invention provides a heating control method of electric water heater, resolving the problem of continuing heat according to the presetting after water boiled. The method includes following steps: a microprocessor detects whether the sensor is normal, dried burning or not, when a control circuit is powered on with the heat power, the sensor starts to detect the water temperature in the water heater and store, the microprocessor calculates the temperature change rate and stores, comparing the temperature change rate of the latter period with the temperature change rate of the former period, the microprocessor judges whether water is boiled or not, the control circuit continues heating water after switching to the heating power set value recalculated by the microprocessor, when achieving the set time, the control circuit cuts off the heating power. Compared with the prior art, the control circuit continues heating water after switching to the heating power set value recalculated by the microprocessor, adjusting the proper power by a preset, and continuing boiling, not only saving energy, but also continuing heat of meeting different aims.

Description

technical field [0001] The invention relates to a control method of an electric water heater, in particular to a heating control method of the electric water heater. Background technique [0002] Electric water heaters are small household appliances commonly used in families and units. The traditional method of judging and controlling water boiling is to use a bimetallic sheet to make a steam switch. After the water boils, the bimetallic sheet is deformed to cut off the power supply. The disadvantage of cutting off the power supply by deformation of the bimetal sheet is that in some cases, the user needs to continue heating with the appropriate power for a period of time after the water in the electric water heater boils, so as to meet different purposes of use. But, at present, the water heater that utilizes the water boiling to deform the bimetal sheet to cut off the power supply, once the water is boiled, the power supply will be cut off, cannot be artificially preset for...

Claims

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Application Information

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IPC IPC(8): G05B19/04F24H9/20
Inventor 张默晗王耀伦徐旺
Owner SHENZHEN CRASTAL TECH CO LTD
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