CN216524233U - Thermoelectric water kettle water level detection circuit - Google Patents
Thermoelectric water kettle water level detection circuit Download PDFInfo
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- CN216524233U CN216524233U CN202122189317.2U CN202122189317U CN216524233U CN 216524233 U CN216524233 U CN 216524233U CN 202122189317 U CN202122189317 U CN 202122189317U CN 216524233 U CN216524233 U CN 216524233U
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- water level
- level detection
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Abstract
The utility model discloses a water level detection circuit of a thermoelectric kettle, which comprises a kettle body, wherein the kettle body is provided with a cavity, the bottom end of the cavity is provided with a stainless steel shell, the stainless steel shell is directly connected to a low-voltage power supply or is connected to the power supply through a capacitor, the surface of the stainless steel shell is provided with a water level detection probe, the water level detection probe is connected with a control mainboard, the control mainboard is provided with a first capacitor and a second capacitor, the first capacitor and the second capacitor are set to be capacitors with different capacities, two ends of the second capacitor are directly or through a current-limiting resistor connected to an input/output interface of a single chip microcomputer, an I/O interface of the single chip microcomputer controls a first capacitor with a relatively small capacity to charge a second capacitor with a relatively large capacity, a charging and discharging loop is formed by the stainless steel kettle body directly connected to the low-voltage power supply, water in the kettle cavity and the first capacitor, the second capacitor is charged to a set voltage by the first capacitor, and the water level state in the kettle is judged by the singlechip according to the number of times that the second capacitor is charged to the set voltage by the first capacitor.
Description
Technical Field
The utility model relates to the technical field of electric kettles, in particular to a water level detection circuit of a thermoelectric kettle.
Background
The water level detection mode of the traditional electric kettle is to detect by using an AD (analog-digital) or touch module, and the AD mode has large detection current, so that the heating plate is easy to yellow and discolor; the touch module mode is used, the water level detection and the touch key share the same capacitance detection circuit and are integrated in the chip, the detection frequency of the touch key is higher, the frequency of the water level detection is higher, the detection frequency is too high and is easily influenced by the capacitance distributed among lines, misjudgment is easily generated, and therefore the accuracy of the water level detection is influenced, and the touch module mode is the main defect of the traditional technology.
SUMMERY OF THE UTILITY MODEL
The utility model solves the problems that: the first capacitor with relatively small capacity charges the second capacitor with relatively large capacity, the water level state in the cavity is detected by calculating the charging times of the second capacitor to the set threshold voltage, when water exists in the cavity, the charging times are less, and when no water exists in the cavity, the charging times are more.
The technical scheme adopted by the utility model is as follows: a thermoelectric water kettle water level detection circuit comprises a kettle body, wherein a cavity is formed in the kettle body, a stainless steel shell is arranged at the bottom end of the cavity, the stainless steel shell is directly connected to a low-voltage power supply or is connected to the power supply through a capacitor to provide a loop for the detection circuit, a water level detection probe is arranged on the surface of the stainless steel and is connected with a control mainboard, the control mainboard is provided with a first capacitor and a second capacitor, and two ends of the second capacitor are connected to two I/O interfaces of a single chip microcomputer; the first capacitor and the second capacitor are set to be capacitors with different capacities, and an electrical frequency is generated between the first capacitor and the second capacitor.
Furthermore, the second capacitor is provided with a current-limiting resistor.
Further, the first capacitor may be two or more capacitors.
Further, the first capacitor may be a Y capacitor or a combination of a Y capacitor and other capacitors instead.
Furthermore, the water level detection circuit can be one group or more than one group, and different functions can be realized by installing the water level detection probe at different positions or by using the combination of two groups or more than two groups of water level detection circuits and installing the water level detection probe at different positions of the kettle body.
The utility model has the beneficial effects that: the first capacitor and the second capacitor have different capacities, and the state of the water level in the kettle body is detected by the times of charging the large capacitor to the set threshold value by the small capacitor, so that the charging and discharging frequency can be very low, the frequency can be dozens of K, and the influence of the distributed capacitor generated by wiring during installation can be ignored.
Drawings
FIG. 1 is a schematic view of the structure of a kettle body of the present invention;
FIG. 2 is a schematic diagram of the connection between the water level detecting probe and the first capacitor and the second capacitor according to the present invention;
FIG. 3 is a schematic diagram of a current-limiting resistor disposed between the first capacitor and the second capacitor according to the present invention;
fig. 4 is a schematic waveform diagram of the first capacitor and the second capacitor according to the present invention.
Detailed Description
As shown in fig. 1 to 4, the thermoelectric water kettle water level detection circuit comprises a kettle body 10, wherein the kettle body 10 is provided with a cavity, water can be loaded in the cavity, and the thermoelectric water kettle can heat the water in the cavity.
The bottom of cavity is equipped with stainless steel casing 11, stainless steel casing 11 direct connection to low voltage power, perhaps connect to the power through the electric capacity, provides the return circuit for this electric capacity charge-discharge circuit, 11 surfaces of stainless steel casing are equipped with water level detection probe 12, water level detection probe 12 work detects the state of water level in the cavity.
The water level detection probe 12 is connected with a control main board, the control main board is provided with a first capacitor 21 and a second capacitor 22, two ends of the second capacitor are respectively connected to two I/O interfaces of the single chip microcomputer, the first capacitor 21 and the second capacitor 22 are capacitors with different capacities, and the capacity of the first capacitor 21 is smaller than that of the second capacitor 22.
In specific implementation, an electrical frequency is generated between the first capacitor 21 and the second capacitor 22, and an electrical frequency signal is generated and controlled by the single chip microcomputer through an I/O port of the single chip microcomputer.
The first counter-capacitor 21 of relatively small capacity charges the second capacitor 22 of relatively large capacity, and the water level in the cavity is detected by counting the number of charges of the second capacitor 22 to a set threshold. The second capacitor 22 is provided with a current limiting resistor 31, and the current limiting resistor 31 can protect the second capacitor 22, so that the discharge current of the second capacitor 22 is prevented from being too large, and the service life of the second capacitor is shortened.
When the kettle is used, the first capacitor 21 and the second capacitor 22 have different capacities, and the state of the water level in the kettle body 10 is detected by using a small capacitor to charge a large capacitor, so that the charging and discharging frequency can be very low by dozens of K, and the influence of distributed capacitance generated by wiring during installation can be ignored.
Claims (5)
1. A thermoelectric water kettle water level detection circuit is characterized in that: comprises a pot body (10), the pot body (10) is provided with a cavity,
a stainless steel shell (11) is arranged at the bottom end of the cavity, a water level detection probe (12) is arranged on the surface of the stainless steel shell (11), the stainless steel shell (11) is connected to a low-voltage power supply,
the water level detection probe (12) is connected with a control main board, the control main board is provided with a first capacitor (21) and a second capacitor (22), the first capacitor (21) and the second capacitor (22) are set to be capacitors with different capacities,
two ends of the second capacitor (22) are respectively connected with the I/O1 and the I/O2 of the I/O interface of the singlechip,
an electric frequency is generated between the first capacitor (21) and the second capacitor (22), and an electric frequency signal is controlled by a single chip microcomputer.
2. The water level detecting circuit of the thermo-electric kettle according to claim 1, wherein: the second capacitor (22) is provided with a current limiting resistor (31).
3. The water level detecting circuit of the thermo-electric kettle according to claim 1, wherein: the first capacitor (21) may be two or more capacitors.
4. The water level detecting circuit of the thermo-electric kettle according to claim 3, wherein: the first capacitor (21) may be a Y capacitor or a combination of a Y capacitor and other capacitors.
5. The water level detecting circuit of the thermo-electric kettle according to claim 1, wherein: the water level detection circuit can be one group or more than one group, the water level detection probe (12) is arranged at different positions or two groups or more than two groups of water level detection circuit combinations are used, and different functions are realized by arranging the water level detection probe (12) at different positions of the kettle body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122189317.2U CN216524233U (en) | 2021-09-10 | 2021-09-10 | Thermoelectric water kettle water level detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122189317.2U CN216524233U (en) | 2021-09-10 | 2021-09-10 | Thermoelectric water kettle water level detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216524233U true CN216524233U (en) | 2022-05-13 |
Family
ID=81515924
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122189317.2U Active CN216524233U (en) | 2021-09-10 | 2021-09-10 | Thermoelectric water kettle water level detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216524233U (en) |
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2021
- 2021-09-10 CN CN202122189317.2U patent/CN216524233U/en active Active
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