CN103892711A - Multi-parameter quick-heating water dispenser and control method thereof - Google Patents
Multi-parameter quick-heating water dispenser and control method thereof Download PDFInfo
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Abstract
The invention discloses a multi-parameter quick-heating water dispenser comprising a water tank, a water pump and a heater sequentially connected through a pipeline. The multi-parameter quick-heating water dispenser further comprises a controller, a first switch unit and a second switch unit. The water tank is provided with a first temperature sensor. The heater is provided with a second temperature sensor. Both the first temperature sensor and the second temperature sensor are connected with the controller. An alternating current voltage collection unit is connected between the controller and an alternating current power source. The controller is used for receiving temperature parameters provided by the first and second temperature sensors and voltage parameters provided by alternating current voltage collection unit, calculating two switching control quantities by a PID algorithm, and converting the switching control quantities into two PWM signals and transmitting the PWM signals to the first and second switch units respectively so as to control break and make of the first and second switch units. The multi-parameter quick-heating water dispenser has the advantages of high control precision, low cost and the like.
Description
Technical field
The present invention relates to water fountain, relate in particular to a kind of multi-parameter Fast Heating water fountain and control method thereof.
Background technology
At present, a class Fast Heating water fountain take coffee pot as representative, leaving water temperature need to be controlled to 99 ℃ of left and right, thereby avoid causing because temperature is too high vaporization, cause water-drop sputtering, the water of vomitting, cutout and repeatedly seethe with excitement and cause noise etc., existing Fast Heating water fountain schematic block circuit diagram as shown in Figure 9, water tank 11, suction pump 12 is connected by pipeline successively with heater 13, this water fountain also includes controller 15, the first switch element 16 and second switch unit 17, the first switch element 16 is connected in AC power two ends after being connected in series with suction pump 12, second switch unit 17 is connected in AC power two ends after being connected in series with heater 13, the sidewall of heater 13 is provided with the first temperature sensor 19, the water outlet of water fountain is provided with the second temperature sensor 14, the temperature signal that the first temperature sensor 19 and the second temperature sensor 14 gather transfers to controller 15, heated and suction pump 12 draws water by controller 15 control heaters 13, because two sensors detect respectively the temperature of heater 13 sidewalls and the water temperature of water fountain water outlet, so this type of control mode belongs to FEEDBACK CONTROL, be subject to the lagging influence of feedback signal, and be subject to suction pump 12, the impact of heater 13 errors such as device such as grade, cause controller 15 to suction pump 12, the control accuracy of heater 13 is less demanding, error is larger, easily cause temperature overshot and occur water-drop sputtering, the water of vomitting, cutout, the phenomenon such as boiling repeatedly.In addition, because the second temperature sensor 14 detects coolant-temperature gage and directly contacts with water, and the first temperature sensor 19 only detects the temperature of heater 13 sidewalls, so the structure of the second temperature sensor 14 is very complicated compared with the first temperature sensor 19, and the price of the second temperature sensor 14, higher than the first temperature sensor 19 decades of times, has increased product cost greatly.
Summary of the invention
The technical problem to be solved in the present invention is, for the deficiencies in the prior art, provides a kind of control accuracy a kind of multi-parameter Fast Heating water fountain and control method thereof high, with low cost.
For solving the problems of the technologies described above, the present invention adopts following technical scheme.
A kind of multi-parameter Fast Heating water fountain, it includes the water tank connecting successively by pipeline, suction pump and heater, this water fountain also includes controller, the first switch element and second switch unit, the first switch element is connected in AC power two ends after being connected in series with suction pump, second switch unit is connected in AC power two ends after being connected in series with heater, water tank is provided with the first temperature sensor, heater is provided with the second temperature sensor, the first temperature sensor is connected respectively controller with the second temperature sensor, between described controller and AC power, be connected with AC voltage sampling unit, the voltage parameter that controller provides for the temperature parameter that receives the first temperature sensor and the second temperature sensor and provide and AC voltage sampling unit, and utilize pid algorithm to calculate double switch controlled quentity controlled variable, again double switch controlled quentity controlled variable is converted to two-way pwm signal and transfers to respectively the first switch element and second switch unit, to control the break-make interval of the first switch element and second switch unit.
Preferably, controller is connected with voltage regulation unit, voltage regulation unit includes the first rectifying tube and the voltage-stabiliser tube that connect successively, between the output of the first rectifying tube and ground, be connected with filter capacitor and voltage-stabiliser tube, the tie point of the first rectifying tube and voltage-stabiliser tube is used to the first switch element that driving voltage is provided, and the output of voltage-stabiliser tube is used to controller that power supply is provided.
Preferably, suction pump is direct current suction pump, and this suction pump is in series with the 5th rectifying tube.
Preferably, the first switch element includes the first IGCT and NPN pipe, and the first IGCT and suction pump are in series, the colelctor electrode access driving voltage of a NPN pipe, the pwm signal of its base stage access controller, its emitter stage is for the gate pole of outputting drive voltage to the first IGCT.
Preferably, second switch unit includes the second IGCT and optocoupler, and the second IGCT and heater are in series, and the control side of optocoupler connects controller to receive break-make control signal, and the switch-side of optocoupler is connected between the gate pole and anode of the second IGCT.
Preferably, also include the 5th NPN pipe, the base stage of the 5th NPN pipe connects AC power by current-limiting resistance, the grounded emitter of the 5th NPN pipe, and its colelctor electrode connects high potential by pull-up resistor, and the electric signal transmission of this colelctor electrode is to controller.
Preferably, AC voltage sampling unit includes the 4th rectifying tube and two divider resistances that are connected in AC power two ends and series connection successively, and the electric signal transmission of two divider resistance tie points is to controller.
Preferably, also include button, the 3rd NPN pipe, the 4th NPN pipe, red LED and green LED, one end ground connection of button, its other end is connected in controller, the base stage of the 3rd NPN pipe and the 4th NPN pipe is connected to controller, the colelctor electrode of the 3rd NPN pipe and the 4th NPN pipe connects high potential by current-limiting resistance respectively, and the emitter stage of the 3rd NPN pipe and the 4th NPN pipe is distinguished serial red LED and green LED, and by the minus earth of red LED and green LED.
The control method of above-mentioned multi-parameter Fast Heating water fountain comprises the steps: step S1, system initialization; Step S2, obtains current time; Step S3, obtains the voltage parameter that temperature parameter that the first temperature sensor and the second temperature sensor provide and AC voltage sampling unit provide; Step S4, according to temperature parameter and voltage parameter, utilizes pid algorithm to calculate double switch controlled quentity controlled variable; Whether step S5, reach the default sampling period, if so, performs step S6, is back to if not step S2; Step S6, is converted to double switch controlled quentity controlled variable two-way pwm signal and transfers to respectively the first switch element and second switch unit, to drive suction pump running and heater heating.
Preferably, in step S4, after compute switch controlled quentity controlled variable, carry out unloaded heating steps is set, and judged whether key-press input, if without key-press input, keep unloaded heating, if there is key-press input, call flash function, obtain flash data and perform step S5.
Multi-parameter Fast Heating water fountain disclosed by the invention, its beneficial effect is compared to existing technologies:
1, controller, by improving the pid algorithm of the stability of a system, is accurately controlled suction pump, heater, efficiently solves the impacts of device error on water fountain control accuracy such as temperature overshot and suction pump, heater; 2, without the cooling-water temperature sensor directly contacting with water in water outlet setting, thereby greatly reduce the cost of product; 3, further avoided water-drop sputtering, the water of vomitting, cutout and repeatedly seethed with excitement and cause the bad phenomenon such as noise.
Accompanying drawing explanation
Fig. 1 is the schematic block circuit diagram of multi-parameter Fast Heating water fountain of the present invention.
Fig. 2 is the circuit theory diagrams of voltage regulation unit and switch element.
Fig. 3 is the circuit theory diagrams of controller.
Fig. 4 is the circuit theory diagrams that sensor is connected in controller.
Fig. 5 is that alternating voltage turns direct-flow impulse circuit schematic diagram.
Fig. 6 is AC voltage sampling element circuit schematic diagram.
Fig. 7 is the circuit theory diagrams of button and display section.
Fig. 8 is the flow chart of the control method of multi-parameter Fast Heating water fountain of the present invention.
Fig. 9 is existing Fast Heating water fountain schematic block circuit diagram.
The specific embodiment
Below in conjunction with drawings and Examples, the present invention is described in more detail.
A kind of multi-parameter Fast Heating water fountain, as shown in Figures 1 to 4, it includes the water tank 1 connecting successively by pipeline, suction pump 2 and heater 3, this water fountain also includes controller 5, the first switch element 6 and second switch unit 7, refer to Fig. 3, controller 5 includes single-chip microcomputer U3 and peripheral circuit thereof, the first switch element 6 is connected in AC power two ends after being connected in series with suction pump 2, second switch unit 7 is connected in AC power two ends after being connected in series with heater 3, water tank 1 lateral wall is provided with the first temperature sensor 8, heater 9 is provided with the second temperature sensor 9, the first temperature sensor 8 is connected respectively controller 5 with the second temperature sensor 9.Refer to Fig. 4, the first temperature sensor 8 is connected between high potential VDD_MCU and ground after connecting with resistance R 7, and the tie point of the two is connected in the analog quantity port AD1 of single-chip microcomputer U3, similarly, the second temperature sensor 9 is connected between high potential VDD_MCU and ground after connecting with resistance R 6, and the tie point of the two is connected in the analog quantity port AD0 of single-chip microcomputer U3, between controller 5 and AC power, be connected with AC voltage sampling unit 11, the temperature parameter Th that controller 5 provides for receiving the first temperature sensor 8, the voltage parameter U that the temperature parameter Ta that the second temperature sensor 9 provides and AC voltage sampling unit 11 provide, and utilize pid algorithm to calculate double switch controlled quentity controlled variable Dh, Dp, again by double switch controlled quentity controlled variable Dh, Dp is converted to two-way pwm signal and transfers to respectively the first switch element 6 and second switch unit 7, to control the break-make interval of the first switch element 6 and second switch unit 7, this pid algorithm is PID control algolithm.
The first temperature sensor 8 on water tank 1 is located in this multi-parameter Fast Heating water fountain utilization and the second temperature sensor 9 of being located on heater 9 carries out temperature detection, wherein, the data processing that controller 5 carries out according to temperature parameter Th and signal output form FEEDFORWARD CONTROL, the data processing that controller 5 carries out according to temperature parameter Ta and signal output form FEEDBACK CONTROL, the voltage parameter U providing according to AC voltage sampling unit 11 judges power-up state and the supply voltage of water fountain simultaneously, again in conjunction with temperature parameter Th, temperature parameter Ta and voltage parameter U, utilization can improve the pid algorithm of the stability of a system, accurately control the water yield of suction pump 2 and the heating power of heater 3, temperature overshot and suction pump 2 are avoided, heater 3 impacts of error such as device such as grade on water fountain control accuracy, and effectively avoid water-drop sputtering, the water of vomitting, cutout and repeatedly seethe with excitement and cause the bad phenomenon such as noise, simultaneously, without the cooling-water temperature sensor directly contacting with water in water outlet setting, thereby greatly reduce the cost of product.
In conjunction with Fig. 1 and 2, controller 5 is connected with voltage regulation unit 10, voltage regulation unit 10 includes the first rectifying tube D1 and the voltage-stablizer U1 that connect successively, between the output of the first rectifying tube D1 and ground, be connected with filter capacitor C5 and Zener diode D3, the tie point of the first rectifying tube D1 and Zener diode D3 is used to the first switch element 6 that driving voltage VIN is provided, the output of voltage-stablizer U1 is used to controller 5 that power supply is provided, this voltage-stablizer U1 can be 7805 voltage-stabiliser tubes, its output is high potential VDD_MCU, wherein, driving voltage VIN is greater than high potential VDD_MCU, so that the voltage of different value is provided.
In conjunction with Fig. 1 and 2, suction pump 2 is direct current suction pumps, this suction pump 2 is in series with the 5th rectifying tube D5, the first switch element 6 includes the first IGCT TR1 and NPN pipe Q1, the first IGCT TR1 and suction pump 2 are in series, the colelctor electrode access driving voltage of the one NPN pipe Q1, particularly, this colelctor electrode can connect high potential VDD_MCU, the pwm signal of its base stage access controller 5, its emitter stage is for the gate pole of outputting drive voltage to the first IGCT TR1, the one NPN pipe Q1 is under the driving of pwm signal, by high potential VDD_MCU voltage transmission to the first IGCT TR1, control the break-make of the first IGCT TR1, and then the duration that powers on of adjustment motor 2.
The circuit structure of second switch unit 7 and the first switch element 6 are different, this second switch unit 7 includes the second IGCT TR2 and optocoupler U2, the second IGCT TR2 and heater 3 are in series, the control side of optocoupler U2 connects controller 5 to receive break-make control signal, the switch-side of optocoupler U2 is connected between the gate pole and anode of the second IGCT TR2, further, the luminous tube anode that this optocoupler U2 controls side meets high potential VDD_MCU by resistance R 15, its negative electrode receives the pwm signal of controller 5, to control the break-make of the second IGCT TR2, and then the duration that powers on of adjustment electric heater 3.
Above-mentioned the first switch element 6 all adopts conventional components and parts with low cost with second switch unit 7, is guaranteeing, on the basis of accurately generation switch motion, also to make water fountain have cheaper product cost.
Shown in Fig. 1 and Fig. 5, this multi-parameter Fast Heating water fountain also includes alternating voltage and turns direct-flow impulse circuit, this circuit includes the 5th NPN pipe Q5, the base stage of the 5th NPN pipe Q5 connects AC power by current-limiting resistance R23, the grounded emitter of the 5th NPN pipe Q5, its colelctor electrode meets high potential VDD_MCU by pull-up resistor R20, and the electric signal transmission of this colelctor electrode is to controller 5, this circuit is for gathering the voltage change cycle of AC power, by the 5th NPN pipe Q5, the wave form varies of alternating voltage is converted to DC voltage skip signal and transfers to controller 5, the saltus step that makes output signal is synchronous with the variation of corresponding alternating voltage, thereby further improve control accuracy and the stability of a system.
In conjunction with Fig. 1 and Fig. 6, AC voltage sampling unit 11 includes the 4th rectifying tube D4 and two divider resistance R16, the R5 that are connected in AC power two ends and series connection successively, the electric signal transmission of two divider resistance R16, R5 tie point, to controller 5, makes the voltage of AC power after over commutation, transfer to controller 5.
In conjunction with Fig. 1 and Fig. 7, for the ease of manipulation and demonstration, also include button SW1, the 3rd NPN pipe Q3, the 4th NPN pipe Q4, red LED and green LED, one end ground connection of button SW1, its other end is connected in controller 5, the base stage of the 3rd NPN pipe Q3 and the 4th NPN pipe Q4 is connected to controller 5, the colelctor electrode of the 3rd NPN pipe Q3 and the 4th NPN pipe Q4 connects high potential by current-limiting resistance respectively, emitter stage serial red LED and the green LED respectively of the 3rd NPN pipe Q3 and the 4th NPN pipe Q4, and by the minus earth of red LED and green LED.
In order better the Fast Heating water fountain of said structure to be combined with practical application, the present invention also discloses a kind of control method of multi-parameter Fast Heating water fountain, and shown in Fig. 1 and Fig. 8, the method comprises the steps:
Step S1, system initialization, comprises that rising edge interrupts initializing, FlexiTimer2 arranges initialization and the PWM cycle initializes, this FlexiTimer2 is timing function;
Step S2, obtains current time t;
Step S3, obtains the voltage parameter U that temperature parameter Th, Ta that the first temperature sensor 8 and the second temperature sensor 9 provide and AC voltage sampling unit 11 provide;
Step S4, according to temperature parameter Th, Ta and voltage parameter U, utilize pid algorithm to calculate double switch controlled quentity controlled variable Dh, Dp, afterwards, preferably carry out unloaded heating steps is set, and judge whether key-press input, if without key-press input, keep unloaded heating, if there is key-press input, call flash function, this flash function is used for carrying out event scheduling, obtain flash data and perform step S5, the specific explanations of this flash function is: marking of control action (is opened water pump, first stage PID controls, second stage PID controls, stop heating, stop supply water) the execution moment,
Whether step S5, reach the default sampling period, if so, performs step S6, is back to if not step S2;
Step S6, is converted to double switch controlled quentity controlled variable Dh, Dp two-way pwm signal and transfers to respectively the first switch element 6 and second switch unit 7, to drive suction pump 2 to turn round and heater 3 heats.
In multi-parameter Fast Heating water fountain disclosed by the invention and control method thereof, controller 5 receives temperature parameter Th, temperature parameter Ta and voltage parameter U, in conjunction with FEEDFORWARD CONTROL and FEEDBACK CONTROL, by improving the pid algorithm of the stability of a system, suction pump 2, heater 3 are accurately controlled, efficiently solve the impacts of device error on water fountain control accuracy such as temperature overshot and suction pump, heater, be suitable for applying in this area.Meanwhile, effectively avoid water-drop sputtering, the water of vomitting, cutout and repeatedly seethe with excitement and cause the bad phenomenon such as noise, in addition, without the cooling-water temperature sensor directly contacting with water in water outlet setting, thereby greatly reduce the cost of product.
More than preferred embodiment of the present invention just, is not limited to the present invention, all modifications of making in technical scope of the present invention, is equal to and replaces or improvement etc., all should be included in the scope that the present invention protects.
Claims (10)
1. a multi-parameter Fast Heating water fountain, include the water tank connecting successively by pipeline, suction pump and heater, this water fountain also includes controller, the first switch element and second switch unit, after being connected in series with suction pump, described the first switch element is connected in AC power two ends, after being connected in series with heater, described second switch unit is connected in AC power two ends, it is characterized in that: described water tank lateral wall is provided with the first temperature sensor, described heater is provided with the second temperature sensor, described the first temperature sensor is connected respectively controller with the second temperature sensor, between described controller and AC power, be connected with AC voltage sampling unit, the voltage parameter that described controller provides for the temperature parameter that receives the first temperature sensor and the second temperature sensor and provide and AC voltage sampling unit, and utilize pid algorithm to calculate double switch controlled quentity controlled variable, again double switch controlled quentity controlled variable is converted to two-way pwm signal and transfers to respectively the first switch element and second switch unit, to control the break-make interval of the first switch element and second switch unit.
2. multi-parameter Fast Heating water fountain as claimed in claim 1, it is characterized in that, described controller is connected with voltage regulation unit, described voltage regulation unit includes the first rectifying tube and the voltage-stablizer that connect successively, between the output of the first rectifying tube and ground, be connected with filter capacitor and Zener diode, the tie point of the first rectifying tube and Zener diode is used to the first switch element that driving voltage is provided, and the output of voltage-stablizer is used to controller that power supply is provided.
3. multi-parameter Fast Heating water fountain as claimed in claim 2, is characterized in that, described suction pump is direct current suction pump, and this suction pump is in series with the 5th rectifying tube.
4. multi-parameter Fast Heating water fountain as claimed in claim 2, it is characterized in that, described the first switch element includes the first IGCT and NPN pipe, described the first IGCT and suction pump are in series, the colelctor electrode access driving voltage of a described NPN pipe, the pwm signal of its base stage access controller, its emitter stage is for the gate pole of outputting drive voltage to the first IGCT.
5. multi-parameter Fast Heating water fountain as claimed in claim 1, it is characterized in that, described second switch unit includes the second IGCT and optocoupler, described the second IGCT and heater are in series, the control side of described optocoupler connects controller to receive break-make control signal, and the switch-side of described optocoupler is connected between the gate pole and anode of the second IGCT.
6. multi-parameter Fast Heating water fountain as claimed in claim 1, it is characterized in that, also include the 5th NPN pipe, the base stage of described the 5th NPN pipe connects AC power by current-limiting resistance, the grounded emitter of the 5th NPN pipe, its colelctor electrode connects high potential by pull-up resistor, and the electric signal transmission of this colelctor electrode is to controller.
7. multi-parameter Fast Heating water fountain as claimed in claim 1, it is characterized in that, described AC voltage sampling unit includes the 4th rectifying tube and two divider resistances that are connected in AC power two ends and series connection successively, and the electric signal transmission of two divider resistance tie points is to controller.
8. multi-parameter Fast Heating water fountain as claimed in claim 1, it is characterized in that, also include button, the 3rd NPN pipe, the 4th NPN pipe, red LED and green LED, one end ground connection of described button, its other end is connected in controller, the base stage of described the 3rd NPN pipe and the 4th NPN pipe is connected to controller, the colelctor electrode of described the 3rd NPN pipe and the 4th NPN pipe connects high potential by current-limiting resistance respectively, the emitter stage of described the 3rd NPN pipe and the 4th NPN pipe is distinguished serial red LED and green LED, and by the minus earth of red LED and green LED.
9. a control method for the multi-parameter Fast Heating water fountain as described in as arbitrary in claim 1 to 8, is characterized in that comprising the steps:
Step S1, system initialization;
Step S2, obtains current time;
Step S3, obtains the voltage parameter that temperature parameter that the first temperature sensor and the second temperature sensor provide and AC voltage sampling unit provide;
Step S4, according to temperature parameter and voltage parameter, utilizes pid algorithm to calculate double switch controlled quentity controlled variable;
Whether step S5, reach the default sampling period, if so, performs step S6, is back to if not step S2;
Step S6, is converted to double switch controlled quentity controlled variable two-way pwm signal and transfers to respectively the first switch element and second switch unit, to drive suction pump running and heater heating.
10. the control method of multi-parameter Fast Heating water fountain as claimed in claim 9, it is characterized in that, in described step S4, after compute switch controlled quentity controlled variable, carry out unloaded heating steps is set, and judge whether key-press input, if without key-press input, keep unloaded heating, if there is key-press input, call flash function, obtain flash data and perform step S5.
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