A multi-parameter rapid heating water dispenser and its control method

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 [0001] The invention relates to a drinking fountain, in particular to a multi-parameter rapid heating drinking fountain and a control method thereof. Background technique [0002] At present, a type of fast heating water dispenser represented by a coffee pot needs to control the temperature of the water outlet at about 99°C, so as to avoid vaporization caused by too high a temperature, resulting in splashing of water droplets, vomiting, interruption of flow, and noise caused by repeated boiling. , the block diagram of the existing rapid heating water dispenser circuit is as follows Figure 9 As shown, the water tank 11, the water pump 12 and the heater 13 are sequentially connected through pipelines, and the drinking fountain also includes a controller 15, a first switch unit 16 and a second switch unit 17, and the first switch unit 16 and the water pump 12 Connected in series to both ends of the AC power supply, the second switch unit 17 is connected in seri...

AI Technical Summary

Problems solved by technology

[0002] At present, a type of fast heating water dispenser represented by a coffee pot needs to control the temperature of the water outlet at about 99°C, so as to avoid vaporization caused by too high a temperature, resulting in splashing of water droplets, vomiting, interruption of flow, and noise caused by repeated boiling. , the block diagram of the existing rapid heating water dispenser circuit is as follows Figure 9 As shown, the water tank 11, the water pump 12 and the heater 13 are sequentially connected through pipelines, and the drinking fountain also includes a controller 15, a first switch unit 16 and a second switch unit 17, and the first switch unit 16 and the water pump 12 Connected in series to both ends of the AC power supply, the second switch unit 17 is connected in series with the heater 13 and connected to both ends of the AC power supply, the side wall of the heater 13 is provided with a first temperature sensor 19, and the water outlet of the drinking fountain is provided with There is a second temperature sensor 14, the temperature signals collected by the first temperature sensor 19 and the second temperature sensor 14 are transmitted to the controller 15, and the controller 15 controls the heating of the heater 13 and the pumping of the water pump 12, because the two sensors respectively detect the heating The temperature of the side wall of the drinking fountain 13 and the water temperature at the water outlet of the drinking fountain, so this kind of control method belongs to feedback control, which is affected by the hysteresis of the feedback signal and the influence of the errors of the components such as the water pump 12 and the heater 13, resulting in the controller 15 The control accuracy of the water pump 12 and the heater 13 is not high, and the error is relatively large, which may easily lead to temperature overshoot, resulting in splashing of water droplets, vomiting, flow interruption, repeated boiling, etc.

In addition, since the second temperature sensor 14 detects the temperature of the water and is in direct contact with the water, while the first temperature sensor 19 only detects the temperature of the side wall of the heater 13, the structure of the second temperature sensor 14 is quite complete compared to the first temperature sensor 19. Complicated, and the price of the second temperature sensor 14 is tens of times higher than that of the first temperature sensor 19, which greatly increases the product cost

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