A solar water heater intelligent control circuit – solar water heater, water heater – HC Network Appliance Industry
< BR> <BR> This paper describes a used Sun
Water heater
The automatic control circuit. The circuit of the water level, water temperature setting and display, automatic segmentation Sheung Shui, sealing and thermal compensation function power port. A long-time use of the practice of good results.
<BR> <BR> <BR> <BR> <BR> Circuit diagram
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Constitute a circuit
<BR> Circuit diagram shown in Figure 1. By the
Transformer
T, diode D1?? D4, capacitor C1?? C4 and the voltage regulator IC1 and so constitute a block and 12-volt DC power supply.
LED
D5 and constitute a power indicator circuit R1. By the transistor VT4?? VT8 and relay KA3 constitute heating control circuit; R11 is a thermistor, R17 is the thermostat potentiometer. LED D12 and R15 constitute a direct electrical heating circuit; when the LED D12 is lit up, said heating circuit is working. LED D11 and R15 constitute a direct hot water circuit; when the LED D11 is lit, that the water temperature has reached the set value. The water level
Sensor
The water level selector switch SK, transistor VT2, VT3, and relay control circuit KA2 constitute overtime pay. By the light-emitting diode D9 and resistor R9 form replenishment instruction circuit; when the light emitting diode D9, the that the circuit is working overtime pay. By the microcontroller IC2, electronic
Keyboard
SBl-7 and transistor VTl, such as composition KAl relay time setting and time control circuit. The water level sensors, light emitting diodes D14, D15, D16 and SB constitute water level display button display circuit.
<BR> 2 works
<BR> Low-power single-chip microprocessor IC2, model 4EC8700. Includes central processing unit, arithmetic logic unit, input and output port 6, read-only memory 8KB, read and write memory 256B, latch and voltage discriminator. 4EC8700 MCU only deal with time-related data, it can pre-set time program output high, low. The transistor VTl to drive relays KAl. To control "water level control circuit" and "water temperature control circuit" work or not, to supply water heater and
Valve
Open or closed. Time period to the beginning of water, it outputs high, VTl saturated conduction, KAl was electric, KAl-1 closed. At this point, "water temperature control circuit," only by the temperature sensor. If the solar water heater before
Water tank
The water is not drying to the desired temperature, the VT6 turn, VT7, VT8 saturation, relay KA3 was electric, KA3-1 closed. RR electric heater turned on, to make up? Temperature. Instead, relay KA3 power, electric heaters do not work. Meanwhile KAl-2 break, "the water level control circuit" locked. Therefore, water time
<BR> Years, there will be no cold water into the tank. To non-water period beginning? The water at the end of time?, Microcontroller output low, VTl end, KAl power, KAl-1 break, "water temperature control circuit" lock; also KAl-2 closed, " water level control circuit "is only controlled by water level sensors. At this point, Flow box below the set level of water, then close VT2, VT3 saturation, relay KA2 was electric, KA2-1 closed, replenishment valve EV opened for replenishment. When the supply water when it reaches the set level, VT2 base bias and saturated by water level sensors, which VT3 end, KA2 power, KA2-1 break, overtime pay close the valve EV.
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