Heat preservation system and smart cup using same

A heating preservation system includes a selected unit, a control unit, a detection unit, and a heating unit. The selected unit is configured to select a preset temperature from amongst a plurality of differing preset temperatures, each preset temperature corresponds to a preset voltage. The control unit is configured to send out the preset voltage according to the selected preset temperature. The detection unit is configured to detect a temperature of fluid and convert the temperature to a detected voltage. The comparison unit is configured to receive the preset voltage and the detected voltage and compare the detected voltage with the preset voltage. The heating unit is configured to heat the fluid when the detected voltage is less than the preset voltage, and stop heating the fluid when the detected voltage is more than the preset voltage. A smart cup using the heating preservation system is further disclosed.

FIELD

The subject matter herein generally relates to a heat preservation system and a smart cup with the heat preservation system.

BACKGROUND

A water dispenser is generally used to dispense hot water, warm water, and cool water, and a cup can be filled with hot water, or warm water, or cool water, or mixed water.

DETAILED DESCRIPTION

FIG. 1illustrates a smart cup in accordance with an embodiment, including a cup body10, a cover20, and a heat preservation system30secured to the cup body10.

FIG. 2illustrates the heat preservation system30can include a selected unit31, a storage unit33, a control unit35, a comparison unit37, a detection unit38, and a heating unit39.

FIG. 2andFIG. 3illustrate that the selected unit31can include a plurality of selected switches K. Each selected switch K corresponds to a different preset water temperature. The plurality of selected switches K can be rotator, such as rotary knobs13, or toggle switches.

The storage unit33is configured to store a relationship table of each selected switch K, a preset water temperature, and a preset voltage.

The control unit35is configured to find the preset voltage in the relationship table according to the selected switch K and send the preset voltage to the comparison unit37.

FIG. 4illustrates that the control unit35in other embodiments can include a slide rheostat R5and a divider resistor R4coupled to the slide rheostat R5in parallel. The selected unit31is a sliding end of the slide rheostat R5, which can slidably adjust a resistance coupled to the divider resistor R4. When the resistance is changed, a divider voltage between the slide rheostat R5and the divider resistor R4is changed, and the divider voltage is sent to the comparison unit37to be taken as the preset voltage.

The comparison unit37can include a reference port371and a comparison port373. The reference port371is configured to receive the preset voltage sent by the control unit35. The comparison port373is configured to receive a detected voltage from the detection unit38.

The detection unit38is configured to detect water temperature via the cup body10and convert the detected water temperature to the detected voltage to the comparison port373. The detect water temperature can be displayed in a screen11on the cup body10.

The detection unit38can include a pull-up resistor R1and a thermistor R2. A first end of the pull-up resistor R1is coupled to a high level voltage, such as +5V. The high level voltage can be supplied by a USB port301on the cup body10. A second end of the pull-up resistor R1is coupled to a first end of the thermistor R2. A second end of the thermistor R2is grounded. The thermistor R2abuts against an outer surface or a bottom surface of the cup body10and is capable of changing resistance according to the detected water temperature. Thus, a voltage of the first end and the second of the thermistor R2can be changed, and the voltage is the detected voltage, which can be sent to the comparison port373.

The comparison unit37is configured to compare the detected voltage to the preset voltage and send a comparison result to the heating unit39.

The heating unit39can include a heating switch Q1and a heating resistor R3. When the detected voltage is less than the preset voltage, the heating switch Q1is switched on, the heating resistor R3is operated to heat the liquid in the cup body10. When the detected voltage is more than the preset voltage, the heating switch Q1is switched off, the heating resistor R3is stopped from heating the liquid in the cup body10. In one embodiment, the heating switch Q1is an n-typed field-effect tube. The gate electrode G of the heating switch Q1is coupled to the comparison unit37and configured to receive the comparison result. The source electrode S of the heating switch Q1is coupled to a first end of the heating resistor R3. A second end of the heating resistor R3is grounded. The drain electrode D of the heating switch Q1is coupled to the high level voltage. When the detected voltage is less than the preset voltage, the comparison unit37outputs a high level voltage signal, which switches on the heating switch Q1, so that the heating resistor R3is coupled to the high level voltage and operated to heat the liquid in the cup body10. When detected voltage is more than the preset voltage, the comparison unit37outputs a low level voltage signal, which switches off the heating switch Q1, so that the heating resistor R3is disconnected from the high level voltage and stops heating the liquid in the cup body10.