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1、附录 3The Controller of the Domestic Electric Water-Heater1. The perspectives of appliance Water-heater is a kind of domestic electric appliance which can be used in bathroom, wash room and kitchen. The types of water-heater available in the market at present includes: electric water-heater, solar wat
2、er-heater, gas water-heater. To be specifically in China, the use of solar water-heater is limited by the weather and the scope for use is narrow while gas water-hater is fueled by petrol and gas, the supply of which will be difficult to meet the increasing demands and bad for environment. So the el
3、ectric water-heater has become more and more popular among customers. According to statistics from Chinese commercial federation not long ago, the market share of electric water-heater in sales volume and sales revenue has surpassed the gas water-heater which keeps ahead for along time. It is predic
4、ted by this federation that driven by the larger-scale reconstructing of the electric network in the city and the extensive startup of the housing market in the city, the market for electric water-heater will present the strong growth tendency in the next few years. 2. The Goal for Design There are
5、two kinds of electric water-heaters available in the market at present: the continual fluent type and water storage type. Considering the special demand of the moist working conditions on single chip, we adopt the newly promoted MC68HC08 single chip by Motorola to be the control center. With its hig
6、h resistance to interference, steady working, flash memory and so on, this single chip can satisfy the demand of the electric water-heater with high performance. Also considering the fierce competition in domestic appliances industry, we will realize these functions by using components as simple as
7、possible to reduce the cost. We will make full use of the internal and outer functions to enhance the performance-to-price ratio. With few improvements, it can be produced massively with low cost in practice. 3. The LZC-CI Hardware Design 3.1 Technology Standards and Characteristics The main functio
8、n of the controller is to control the temperature. Besides that, it has to realize the following functions:To display the real-time temperature of water, the range is 099. To set the temperature of water arbitrarily within 2080.Have the function of appointment which enables 24 hour turning on settin
9、g willfully.Have LTD to display real-time temperature digitally. When setting, the temperature and the time set will be displayed by flicker and the controller will have instructions of appointment, heat preservation and heating. Able to look over and revise the time of system. Equipped with remote
10、controller, the control will be easy and simple.Cut the power swiftly when temperature is too high and alarm.When electricity leaks, cut the power swiftly and propose alarming. When the power is cut, the data set can be preserved. 3.2 The Structure of the SystemThe system consists of two main parts:
11、 the main controller of water-heater and the remote controller, realized by two pieces of 68hc908gr8 respectively. 3.2.1 The Power Supply and the Clock Circuit The power circuit consists of the transformation bridge, the rectification bridge, the filter resistance, the pressure sensitive resistance
12、and integration voltage-stabilizer circuit MC7812T and MC7805T, which can provide +5V and the +12V power source for the controller. OutsideOSC1 and OSC2, 8 kHz crystal oscillator is connected with the circuit. 3.2.2 The Keyboard The function of controlling and the enactment of parameters are realize
13、d by the pressing the keys. The two keys of the systems main controller complete directly the functions of heating and the inquiring of the water level, using the keyboard severance pattern and PTA2, PTA3 as the input entrance of the pressing. The keyboard of the remote controller is designed into m
14、atrix type. The pressing of the keys will initiate the keyboard severance, by scanning from line to line; the number of the key can be judged and then sent to the register for preservation and the delivering. The main procedure will deal with it in the keyboard procedure after receiving the number o
15、f the key. Since there will be vibration at the moment of turning on and off, the design uses software time delay to eliminate the vibration. 3.2.3 The Display Circuit Considering that the working environment is humid, the main controller takes LED Nixie tube to display. It takes the main way of SPI
16、 to expand two piece of 74LS164 as the output orifice of the static demonstration of the seven-segment display. When there is no pressing, the main controller will display the current temperature of water and the remote controller will display the current time; when setting or inquiring, the remote controller and main controller will flash to display the information set or inquired while when stopping pressing, the display will automatically back t
