CN210540865U

CN210540865U - Electric thermos bottle

Info

Publication number: CN210540865U
Application number: CN201920771917.XU
Authority: CN
Inventors: 朱泽春; 成卫松
Original assignee: Joyoung Co Ltd
Current assignee: Hangzhou Jiuchuang Home Appliances Co ltd
Priority date: 2019-05-27
Filing date: 2019-05-27
Publication date: 2020-05-19
Anticipated expiration: 2029-05-27

Abstract

The utility model discloses an electric hot water bottle, include: the water level detection circuit is used for acquiring a water level sampling value, judging whether a user is prompted to be full of water according to the water level sampling value, and the power supply module is used for supplying power; the water level electrode is arranged at the maximum water level line in the water storage tank, and a power supply port of the main control chip is connected with the power supply module; the input end of the water level detection circuit is connected with the water level electrode, and the output end of the water level detection circuit is connected with the sampling port of the main control chip. The utility model discloses an electric hot water bottle judges whether the water receiving is too full through the water level electrode that sets up in the storage water tank, has avoided the user to hold not good water receiving time and has caused the condition that water spills over the storage water tank.

Description

Electric thermos bottle

Technical Field

The utility model relates to a kitchen appliances field, more specifically relates to an electric hot water bottle.

Background

At present, the electric hot water bottle capacity on the market is generally great, because the time of receiving water in the water tank is generally longer, has most users and opens tap and just go to do the circumstances such as other things when the water receiving to lead to often can appearing the user and hold the condition that does not receive water time well and cause water overflow water tank.

However, excessive water overflows from the top end of the water tank to cause water to enter the circuit board at the bottom, and the whole electric thermos bottle is easily damaged when the electric thermos bottle is electrified again.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides an electric hot water bottle can avoid the user to hold not good water receiving time and cause the condition that water spills over the storage water tank.

The embodiment of the utility model provides an insulating pot, include: the water level detection circuit is used for acquiring the current loop and generating a water level sampling value, the main control chip is used for judging whether to prompt a user that the water level is full according to the water level sampling value, and the power supply module is used for supplying power; wherein:

the water level electrode is arranged at the position of the maximum water level line in the water storage tank, and a power supply port of the main control chip is connected with the power supply module;

the input end of the water level detection circuit is connected with the water level electrode, and the output end of the water level detection circuit is connected with the sampling port of the main control chip.

Further, in the above embodiment, the water level detection circuit includes: a sampling resistor R34 and a filter circuit consisting of a first resistor R32 and a capacitor C33, wherein:

one end of a sampling resistor R34 is respectively connected with the water level electrode and one end of a first resistor R32, and the other end of the sampling resistor R34 is connected with a high level VCC;

the other end of the first resistor R32 is respectively connected with the sampling port of the main control chip and one end of the capacitor C33, and the other end of the capacitor C33 is grounded.

Further, in the above embodiment, the power supply module includes: a switching power supply for supplying power when the electric hot water bottle is connected with the commercial power and a standby power supply for supplying power when the electric hot water bottle is disconnected from the commercial power, wherein:

the input end of the switching power supply is connected with a mains supply, and the input end of the standby power supply is grounded;

the output end of the switching power supply and the output end of the standby power supply are connected with the power supply port of the main control chip.

Further, in the above embodiment, the electric hot water bottle further includes a control circuit for controlling the standby power supply to supply power, and the output end of the standby power supply is connected to the power supply port of the main control chip through the control circuit; wherein:

when the switching power supply supplies power, the control circuit controls the standby power supply not to supply power; when the switching power supply is disconnected from the mains supply, the control circuit controls the standby power supply to supply power;

or;

when the water level of the water storage tank with the switch power supply disconnected from the mains supply is lower than a preset water level value, the control circuit controls the standby power supply not to supply power; and when the water level of the water storage tank is higher than or equal to a preset water level value, the control circuit controls the standby power supply to supply power.

Further, in the above embodiment, the electric hot water bottle further includes a water level float for varying with a level of the liquid in the water storage tank;

the control circuit is a magnetic control switch, the magnetic control switch comprises a reed switch and a magnet, and the reed switch is arranged below the water level electrode and has a preset distance with the water level electrode; the magnet is arranged in the water level floater, and the water level floater is positioned in a water outlet pipe of the electric hot water bottle;

the output end of the standby power supply is connected with the power supply port of the main control chip through the magnetic control switch, wherein one end of the reed switch is connected with the output end of the standby power supply, and the other end of the reed switch is connected with the power supply port of the main control chip;

when the water level is lower than the position of the reed switch, the reed switch is disconnected, and the standby power supply does not supply power; when the water level reaches the position of the reed pipe, the magnet conducts the reed pipe, and the standby power supply supplies power.

Further, in the above embodiment, the preset distance is 1 cm.

Further, in the above embodiment, the electric hot water bottle further includes a diode D1 for isolating the standby power supply from the switching power supply, and an output terminal of the switching power supply is connected to the power supply port of the main control chip through a diode D1; wherein:

the anode of the diode D1 is connected with the output end of the switch power supply, and the cathode of the diode D1 is respectively connected with the other end of the reed switch and the power supply port of the main control chip.

Further, in the above embodiment, the electric hot water bottle further includes a switching circuit for controlling the standby power supply not to output when the switching power supply has an output, the switching circuit including: the circuit comprises a second resistor R1, a third resistor R2, a fourth resistor R3 and a triode Q1; wherein:

one end of a second resistor R1 is respectively connected with the output end of the switching power supply and the anode of the diode D1, the other end of the second resistor R1 is respectively connected with one end of a third resistor R2 and one end of a fourth resistor R3, and the other end of the third resistor R2 is grounded;

the other end of the fourth resistor R3 is connected with the base electrode B of the triode Q1, the emitter electrode E of the triode Q1 is connected with the other end of the reed switch, and the collector electrode C of the triode Q1 is connected with the power supply port of the main control chip and the negative electrode of the diode D1 respectively.

Further, in the above embodiment, the transistor Q1 is of PNP type.

Further, in the above embodiment, the electric hot water bottle further includes a buzzer for sounding when the main control chip outputs a control instruction for prompting the user that the water is full, and the buzzer is connected with the output end of the main control chip.

The utility model discloses at least one embodiment provides an electric hot water bottle compares with prior art, has following beneficial effect: whether the water receiving is over-full is judged through a water level electrode arranged in the water storage tank, a user can be effectively reminded of paying attention to the fact that the water is about to be over-full in the water receiving process, the situation that the user holds poor water receiving time and causes the water to overflow the water storage tank is avoided, the situation that the bottom circuit board is caused to feed water due to the fact that the water overflows from the top end of the water storage tank and the whole machine is damaged when the water is supplied again is avoided.

The utility model discloses in some implementation modes of embodiment, can also reach following effect: 1. the standby battery is added at the bottom of the electric hot water bottle for supplying power, and the electric hot water bottle can still give an alarm under the condition of power failure so as to ensure that a user can still effectively give an alarm under the condition of cutting off the commercial power for receiving water. 2. The control circuit is arranged to control the standby battery to supply power, so that the standby power supply can be ensured not to output when the commercial power supplies power, and the standby power supply can supply power to the MCU when the commercial power is not connected; or the standby power supply works only when the water level is higher than or equal to the high water level line, and the output of the standby power supply can be disconnected when the water level is lower than the high water level line, so that the standby power supply can be output when needing to work, and the service time of a battery of the standby power supply is prolonged. 3. The battery power supply of the standby power supply is controlled in a mode that the water level floater, the magnet and the reed pipe are matched, the standby power supply works only under the condition that the water level is higher than or equal to the high water level line, the output of the standby power supply can be disconnected under the condition that the water level is lower than the high water level line, and the effect of reducing the battery loss is achieved. 4. The diode isolation is added at the output end of the switch power supply, so that the battery and the switch power supply loop can be isolated, and the battery is prevented from reversely discharging to the switch power supply loop, thereby avoiding the electric quantity loss of the battery. 5. The battery of the standby power supply works only when the whole machine is not connected with the commercial power and the water level reaches a preset distance (such as 1 cm) under the high water level, and the output of the battery can be cut off under other conditions, so that the effect of reducing the battery loss is achieved.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

The accompanying drawings are included to provide a further understanding of the embodiments of the present invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention and not to limit the embodiments of the invention.

FIG. 1 is a schematic structural view of an electric hot water bottle according to an embodiment of the present invention;

FIG. 2 is a right sectional view of the electric hot water bottle in accordance with the embodiment of the present invention;

fig. 3 is a schematic structural diagram of a water level detection circuit provided in an embodiment of the present invention;

fig. 4 is a schematic diagram of a battery power supply circuit according to a first embodiment of the present invention;

fig. 5 is a schematic diagram of a battery power supply circuit provided in the second embodiment of the present invention;

FIG. 6 is a front cross-sectional view of the electric hot water bottle;

fig. 7 is a schematic diagram of a battery power supply circuit provided in the third embodiment of the present invention;

fig. 8 is a schematic diagram of a battery power supply circuit according to a fourth embodiment of the present invention;

fig. 9 is a schematic diagram of a battery power supply circuit provided by the fifth embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

Fig. 1 is the utility model provides an electric hot water bottle's schematic structure, fig. 2 is the utility model provides an electric hot water bottle complete machine right side looks sectional view, as shown in fig. 1 and fig. 2, the utility model provides an electric hot water bottle includes: the water level detection device comprises a water storage tank for containing liquid, a water level electrode 4 for forming a current loop with the liquid in the water storage tank, a water level detection circuit 11 for acquiring a current loop, a main control chip 12 for judging whether a user is prompted to be full of water or not according to the water level sampling value, and a power supply module 13 for supplying power. Wherein:

the water level electrode 4 is arranged at the maximum water level line in the water storage tank, and a power supply port of the main control chip 12 is connected with the power supply module 13; the input end of the water level detection circuit 11 is connected with the water level electrode 4, and the output end of the water level detection circuit 11 is connected with the sampling port of the main control chip 12.

In this embodiment, whether the water is overfilled is determined by a water level electrode disposed in the water tank. Specifically, as shown in fig. 2, a water level electrode 4 is disposed in the water storage tank, and the water level electrode 4 is disposed at the maximum water level line in the water storage tank and used for limiting the maximum water receiving amount. When the water level in the water storage tank is close to the water level electrode 4 (at the maximum water level line), the water level electrode 4 and the liquid in the water storage tank form a current loop. The water level detection circuit 11 collects a current loop and generates a water level sampling value. When the water level reaches the high water level line (the water level sampling value reaches the judgment preset value) during water receiving, the main control chip 12 can control the indicator lamp or the buzzer to give an alarm to prompt a user that the maximum water receiving amount is reached and remind the user to close the water faucet.

The main control chip 12 may adopt an existing comparison and determination method in the prior art to determine whether to prompt the user that the water level is full according to the water level sampling value. For example, in the existing comparison and determination method in the prior art, a predetermined determination value may be set in a program of a main control chip, an acquisition port of the main control chip is used to acquire a detection value for determination and comparison, the main control chip compares the acquired detection value with the predetermined determination value, and determines an execution operation of the main control chip according to a comparison result between the detection value and the predetermined determination value.

In this embodiment, when the main control chip 12 determines whether to prompt the user to be full of water (determine whether the water level sampling value reaches a predetermined determination value) according to the water level sampling value, it only needs to connect the acquisition port of the main control chip 12 with the output end of the water level detection circuit to obtain a detection value (for example, the water level sampling value) for determination and comparison, and set a specific value (for example, it can be set to 80) of the predetermined determination value, so as to determine whether the water level sampling value reaches the predetermined determination value, without improving the existing comparison and determination method of the main control chip in the prior art.

Wherein, when the main control chip 12 prompts the user that the water is full, the alarm can be given by controlling the indicator light or the buzzer. The main control chip 12 controls the indicator light or the buzzer to alarm, which is the same as the prior art, and this embodiment is not described herein again. The main control chip 12 can be a single chip microcomputer (Micro Controller Unit, MCU for short)

The embodiment of the utility model provides an electric hot water bottle judges whether the water receiving is too full through the water level electrode that sets up in the water storage tank, can effectively remind the user to notice water and be about to meet fully at the water receiving in-process, has avoided the user to hold not good water receiving time and has caused the condition that water spills over the storage water tank, and then avoids can the excessive water to spill over from the storage water tank top and lead to the bottom circuit board intake, causes the complete machine to damage when going up once more.

Further, in the above embodiment, the water level detection circuit 11 may include a sampling resistor and a filter circuit to implement a current collection loop to generate a water level sampling value. Fig. 3 is a schematic structural diagram of the water level detection circuit provided by the embodiment of the present invention, as shown in fig. 3, the water level detection circuit 11 may include: a sampling resistor R34 and a filter circuit consisting of a first resistor R32 and a capacitor C33, wherein:

one end of the sampling resistor R34 is respectively connected with the water level electrode and one end of the first resistor R32, and the other end of the sampling resistor R34 is connected with a high level VCC; the other end of the first resistor R32 is respectively connected with the sampling port of the main control chip and one end of the capacitor C33, and the other end of the capacitor C33 is grounded.

In this embodiment, as shown in fig. 3, the resistor R0 is a resistor formed by a medium between the water level electrode and the tank wall. When no water exists at the water level electrode, the resistance R0 is very large and is megaohm; when water exists at the water level electrode, the water between the water level electrode and the water storage tank serves as a resistor, and forms a voltage division circuit with the sampling resistor R34 on the circuit board. The output end SW of the voltage division circuit is connected with an AD port of the main control chip, 10-bit AD sampling can be used in the main control chip 12, the sampling AD is about 0X40 when water exists, the sampling AD is about 0X9E when no water exists, and a water detection judgment AD point is set to be 80 in a program; when the sampling AD value is detected to be less than 80, the high water level electrode is judged to be conducted (the water level sampling value is judged to reach the judgment preset value). At this time, the program can control the buzzer to sound to prompt the user that the water is full.

Wherein, the water tank wall can be the metal material in this embodiment, is connected with the ground wire. The water level detection circuit 11 and the main control chip 12 can be arranged on a circuit board of the electric hot water bottle.

Further, in the above embodiment, the power module 13 may supply power to the main control chip 12 to supply power when receiving water. The power supply module can comprise a switching power supply which supplies power when being connected with commercial power; the power module may include a backup power supply to supply power when disconnected from the utility power.

In order to avoid that the electric thermos bottle is far away from the water faucet when most users use the electric thermos bottle, the electric thermos bottle is usually unplugged and then receives water. So because the circuit board can't work, then can not effectively report to the police when the water receiving. In this embodiment, the power module 13 may include: a switching power supply for supplying power when the electric hot water bottle is connected with the commercial power and a standby power supply for supplying power when the electric hot water bottle is disconnected from the commercial power, wherein:

the input end of the switching power supply is connected with the mains supply, and the input end of the standby power supply is grounded; the output end of the switching power supply and the output end of the standby power supply are both connected with the power supply port of the main control chip.

Specifically, as shown in fig. 2, the switching power supply may be disposed on the power board 2, and the standby power supply 3 may be installed near the power board 2 at the bottom of the electric hot water bottle, and connected in parallel with the output end of the power board. In this embodiment, the 5V output end of the power panel is connected in parallel with the backup battery for supplying power, so that the main control chip and the buzzer driving circuit can still work when being disconnected from the commercial power, and the function of water receiving and alarming when being disconnected from the commercial power is achieved.

Wherein, reference numeral 1 in fig. 2 denotes a water receiving control button.

The electric hot water bottle that this embodiment provided increases the stand-by battery power supply in the electric hot water bottle bottom, still can report to the police under the electric hot water bottle outage condition to ensure that the user still can effectively report to the police under the disconnection commercial power water receiving condition.

Optionally, the backup power supply may be 4 sets of dry cell modules connected in series. In this embodiment, adopt dry battery pack to supply power, still can report to the police under the vacuum flask outage condition. Specifically, fig. 4 is the battery power supply circuit schematic diagram provided in the first embodiment of the present invention, as shown in fig. 4, wherein +12V is obtained from the mains supply through the switching power supply, and is converted into 5V through 78L05 to supply power to the main control chip. The dry battery pack is connected with the output of the 78L05 in parallel and supplies power to the main control chip when the mains supply is disconnected. 78L05 is a constant voltage (5V) three-terminal integrated regulator, and the implementation principle is the same as that in the prior art, which is not described herein again.

Further, in the above embodiment, the electric hot water bottle may further include a control circuit for controlling the supply of the standby power, and the output terminal of the standby power is connected to the power supply port of the main control chip through the control circuit. The control circuit controls the standby power supply to supply power by the following modes:

the first implementation mode comprises the following steps: when the switch power supply supplies power, the control circuit controls the standby power supply not to supply power; when the switching power supply is disconnected with the mains supply, the control circuit controls the standby power supply to supply power.

In practical application, when the commercial power works, the whole machine can be powered by the output of the switching power supply, if the standby power supply loop still outputs at the moment, the loss of the electric energy of the battery can be caused, and the service time of the battery of the standby power supply is shortened. In order to solve the problem, in the embodiment, the standby power supply works only when the whole machine is not connected with the mains supply, and the output of the standby power supply can be disconnected under the condition of being connected with the mains supply, so that the effect of reducing the battery loss is achieved.

Specifically, fig. 5 is a schematic diagram of a battery power supply circuit provided in the second embodiment of the present invention, as shown in fig. 5, the control circuit may include a resistor R1, R2, R3 and a PNP transistor Q1 to form a switch circuit. The E pole of the emitter of Q1 is connected with the positive pole of the standby power supply, the C pole of the collector of Q1 is connected with the power supply port of the main control chip, the B pole of the base of Q1 is respectively connected with R3, and R3 is connected to the switching power supply loop through R1 and R2. When the switching power supply loop has output, the base electrode of the triode Q1 is in a high level, the Q1 is a PNP type triode, so that the Q1 works in a cut-off state, at the moment, the output end of the battery is disconnected with the 5V end of the MCU power supply, and the battery does not work. When the switching power supply has no output, the base electrode of the triode Q1 is at a low level, the emitter is connected with the positive electrode of the battery at a high level, the triode Q1 works in a saturated state at the moment, and the battery is output to the 5V end of the MCU for supplying power, so that the MCU can be effectively supplied with power. In the embodiment, when the commercial power works, the battery power supply loop can be automatically disconnected, so that the off-line service time is prevented from being shortened due to battery discharge.

The transistor Q1 may also be an NPN transistor, which has a similar implementation principle to that of a PNP transistor, and only needs to adjust the connection relationship of the transistors.

The control circuit in this embodiment is not limited to the transistor Q1, as long as the control circuit controls the standby power supply not to supply power when the switching power supply supplies power; when the switch power supply is disconnected with the mains supply, the control circuit controls the standby power supply to supply power. For example, the transistor Q1 in the control circuit may also be replaced by a diode, the anode of the diode is connected to the anode of the standby power supply and the power supply port of the main control chip, and the cathode of the diode may be connected to the R3.

The electric hot water bottle that this embodiment provided can ensure that stand-by power supply does not export when the commercial power supplies power, and when not connecing the commercial power, stand-by power supply just can give MCU power supply to can ensure that stand-by power supply just exports when needs during operation, extension stand-by power supply's battery live time.

The second implementation mode comprises the following steps: when the water level of the water storage tank is lower than a preset water level value when the switch power supply is disconnected from the mains supply, the control circuit controls the standby power supply not to supply power; when the water level of the water storage tank is higher than or equal to the preset water level value, the control circuit controls the standby power supply to supply power.

In practical application, because the power consumption of the weak current system of the whole machine is about 0.2W, if the battery of the standby power supply is always in a conducting working state, the working time of four batteries is short. And before the water level does not reach the high water level electrode, the main control chip does not work. In order to solve the problem, in the embodiment, the standby power supply works only when the water level is higher than or equal to the high water level line, and the output of the standby power supply can be disconnected when the water level is lower than the high water level line, so that the effect of reducing the battery loss is achieved.

In the embodiment, the battery power supply of the standby power supply can be controlled in a mode of matching the water level floater, the magnet and the reed switch, the power consumption in a non-prompting mode is avoided, the battery can be ensured not to be output in a low water level state of the water tank, and the whole system is shut down to ensure the long-term use of the electric quantity of the battery.

Specifically, fig. 6 is a front sectional view of the electric hot water bottle provided by the embodiment of the present invention, fig. 7 is a schematic diagram of a battery power supply circuit provided by the third embodiment of the present invention, and as shown in fig. 6 and 7, the electric hot water bottle may further include a water level float 7 for varying with the liquid level in the water storage tank; the control circuit is a magnetic control switch VH02, the magnetic control switch VH02 comprises a reed switch 5 and a magnet 6, the reed switch 5 is arranged below the water level electrode 4, and a preset distance is reserved between the reed switch 5 and the water level electrode 4; the magnet 6 is arranged in the water level floater 7, and the water level floater 7 is arranged in the water outlet pipe of the electric hot water bottle.

The output end of the standby power supply is connected with the power supply port of the main control chip 12 through the magnetic control switch VH02, wherein one end of the reed switch 5 is connected with the output end of the standby power supply, and the other end of the reed switch 5 is connected with the power supply port of the main control chip 12. When the water level is lower than the position of the reed switch 5, the reed switch 5 is disconnected, and the standby power supply does not supply power; when the water level reaches the position of the reed pipe 5, the magnet 6 conducts the reed pipe 5, and the standby power supply supplies power.

Alternatively, the preset distance may be 1 cm.

In this embodiment, in order to prolong the working time of the battery, the magnetic switch is composed of the reed switch 5 and the magnet 6. The reed switch 5 is arranged at a position 1cm below the high water level electrode 4, and the magnet 6 is arranged in the water level floater 7, wherein the water level floater 7 is positioned in the water outlet pipe, and the height can be changed along with the change of the liquid level.

Specifically, a battery power supply loop is connected with a reed switch 5 in series, and a magnet 6 is added in a water level floater 7. When the water level is lower than the high water level, the magnet is separated from the reed switch, the reed switch is not conducted, and the battery of the standby power supply does not supply power. When the water level reaches 1cm below the high water level, the magnet 6 rises to the detection position of the reed pipe 5 along with the water level floater 7, the reed pipe 5 is conducted by the magnet 6 in the water level floater 7, the battery of the standby power supply supplies power, the battery supplies power to the main control chip, and the main control chip enters a working state (a detection alarm state).

The electric hot water bottle that this embodiment provided can adopt water level float + magnet and reed pipe complex mode control stand-by power supply's battery, and stand-by power supply only works when the water level is higher than or equal to the high water line condition, but cuts off stand-by power supply output under the water level is less than the high water line condition, plays the effect that reduces the battery loss, has prolonged stand-by power supply's battery operating time.

Further, in the above embodiment, fig. 8 is a schematic diagram of a battery power supply circuit provided by the fourth embodiment of the present invention. As shown in fig. 8, the electric hot water bottle may further include a diode D1 for isolating the standby power supply from the switching power supply, and the output terminal of the switching power supply is connected to the power supply port of the main control chip through a diode D1; wherein:

In practical application, the voltage of four brand-new dry batteries after being connected in series is 6V, the output voltage of the switching power supply is 5V, the voltage of a switching power supply loop is 0V when the switching power supply is not connected with a mains supply, and because the batteries and the 78L05 output are connected in parallel, when the batteries supply power to the main control MCU, the electrolytic capacitors EC105 of the switching power supply loop can be reversely charged, and the dummy load R116 of the switching power supply also has loss, so that the loss of the electric quantity of the batteries is caused.

To solve the above problem, the present embodiment adds a diode D1 at the rear end of the 5V output of the switching power supply, so that the switching power supply can normally supply power to the MCU. The battery is isolated by the diode D1, so that the reverse discharge of the capacitor can be avoided, and the battery capacity can be protected.

The electric hot water bottle that this embodiment provided, switching power supply output increases the diode and keeps apart, but isolation battery and switching power supply return circuit avoid the battery to switching power supply return circuit backward discharge to avoid the battery power loss.

Further, in the above embodiment, fig. 9 is a schematic diagram of a battery power supply circuit provided by the fifth embodiment of the present invention. As shown in fig. 9, the electric hot water bottle may further include a switching circuit for controlling the standby power not to be output when the switching power is outputted, the switching circuit including: the circuit comprises a second resistor R1, a third resistor R2, a fourth resistor R3 and a triode Q1; wherein:

The triode Q1 is PNP type.

In practical application, when the commercial power works, the whole machine can be powered by the output of the switching power supply, and if the battery loop is still output at the moment, the loss of the electric energy of the battery can be caused, so that the service time of the battery is shortened. In order to solve the problem, in the embodiment, the battery of the standby power supply works only when the whole machine is not connected with the commercial power and the water level reaches a preset distance (such as 1 cm) under a high water level, and the output of the battery can be cut off under other conditions, so that the effect of reducing the battery loss is achieved, and the off-line service time caused by battery discharge is prevented from being shortened.

Specifically, as shown in fig. 9, R1, R2, R3 and Q1 constitute a switching circuit, when the switching power supply loop has an output, the base of the transistor Q1 is at a high level, and Q1 is a PNP transistor, so Q1 operates in a cut-off state, and at this time, the battery output end is disconnected from the MCU power supply 5V end, and the battery does not operate. When the reed switch is conducted and the switching power supply has no output, the base electrode of the triode Q1 is at a low level, the emitter is connected with the positive electrode of the battery at a high level, at the moment, the triode Q1 works in a saturated state, the battery is output to the 5V end of the MCU power supply, and the MCU power supply can be effectively realized. Therefore, the battery can be ensured not to output when the commercial power is supplied; when not connecting the commercial power, when the water level reached preset distance (like 1 cm) department under the high water level, the tongue tube switched on, and the battery just can supply power for MCU this moment to can ensure that the battery just exports when needs work.

In the electric hot water bottle provided by the embodiment, the battery of the standby power supply works only when the whole machine is not connected with the commercial power, and the water level reaches the preset distance (such as 1 cm) under the high water level, and the output of the battery can be disconnected under other conditions, so that the effect of reducing the battery loss is achieved.

Further, in the above embodiment, the electric hot water bottle may further include a buzzer for sounding when the main control chip outputs a control instruction for prompting the user that the water is full, and the buzzer is connected to the output end of the main control chip.

In this embodiment, when the water level reaches the high water level line (the water level sampling value reaches the predetermined judgment value) during water receiving, the main control chip 12 may control the buzzer to alarm, so as to prompt the user that the maximum water receiving amount is reached and prompt the user to close the faucet.

The implementation principle of the buzzer and the implementation method of the main control chip for controlling the buzzer to sound are the same as those in the prior art, and this embodiment is not limited and described herein.

In the description of the present invention, it should be noted that the terms "upper", "lower", "one side", "the other side", "one end", "the other end", "side", "opposite", "four corners", "periphery", "mouth" word structure "and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the structure referred to has a specific orientation, is constructed and operated in a specific orientation, and thus, is not to be construed as limiting the present invention.

In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "connected," "directly connected," "indirectly connected," "fixedly connected," "mounted," and "assembled" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; the terms "mounted," "connected," and "fixedly connected" may be directly connected or indirectly connected through intervening media, or may be connected through two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Although the embodiments of the present invention have been described above, the description is only for the convenience of understanding the present invention, and the present invention is not limited thereto. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. An electric hot water bottle, characterized by comprising: the water level detection circuit is used for acquiring the current loop and generating a water level sampling value, the main control chip is used for judging whether to prompt a user that the water level is full according to the water level sampling value, and the power supply module is used for supplying power; wherein:

2. The electric hot water bottle as claimed in claim 1, wherein the water level detection circuit comprises: a sampling resistor R34 and a filter circuit consisting of a first resistor R32 and a capacitor C33, wherein:

3. The electric hot water bottle as claimed in claim 1 or 2, wherein the power supply module comprises: a switching power supply for supplying power when the electric hot water bottle is connected with the commercial power and a standby power supply for supplying power when the electric hot water bottle is disconnected from the commercial power, wherein:

4. The electric hot water bottle of claim 3, further comprising a control circuit for controlling the supply of the standby power, wherein the output end of the standby power is connected with the power supply port of the main control chip through the control circuit; wherein:

or;

5. The electric hot water bottle as claimed in claim 4, further comprising a water level float for varying with a level of the liquid in the water storage tank;

6. An electric thermos bottle according to claim 5, characterized in that said predetermined distance is 1 cm.

7. The electric hot water bottle as claimed in claim 5, further comprising a diode D1 for isolating the standby power supply from the switching power supply, wherein the output terminal of the switching power supply is connected to the power supply port of the main control chip through a diode D1; wherein:

8. The electric hot water bottle as claimed in claim 7, further comprising a switching circuit for controlling the standby power not to be outputted when the switching power is outputted, the switching circuit comprising: the circuit comprises a second resistor R1, a third resistor R2, a fourth resistor R3 and a triode Q1; wherein:

9. The electric hot water bottle as claimed in claim 8, wherein the transistor Q1 is of PNP type.

10. The electric hot water bottle of claim 1 or 2, further comprising a buzzer for sounding when the main control chip outputs a control instruction for prompting a user that the water is full, wherein the buzzer is connected with the output end of the main control chip.