Wireless power supply circuit applied to container heating

Abstract

The utility model discloses a wireless power supply circuit applied to container heating, which comprises a receiving coil, a main control module, a temperature control module and a heating module, wherein the receiving coil is used for communicating with a wireless charging module and receiving energy sent by the wireless charging module; the main control module is used for converting energy received by the receiving coil into current and voltage and supplying power to the temperature control module and the heating module. The temperature control module is used for detecting the temperature of the bottom of the container in real time and controlling the working state of the heating module according to the detected temperature. The alternating current energy received by the receiving coil is converted into the direct current to supply power to the main control module, the temperature control module and the heating module, the working state of the heating module is controlled by the temperature control module, the heating module is not close to the receiving coil, and the heating mode of the container is converted from eddy current heating to electric energy power supply heating. The problem that the metal container and the transmitting coil easily generate eddy current to trigger circuit self-protection when eddy current heating is adopted is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of container heating, in particular to a wireless power supply circuit applied to container heating. Background Art

[0002] Containers such as water cups, traditional Chinese medicine cups, and baby bottles used in daily life usually need to keep the substances in the containers warm. There are already many heat-preserving pads for containers. The power supply of the heat-preserving pads is generally through wired connection or wireless power supply mode. When using wireless power supply, for example, patent CN110933794 discloses an intelligent constant temperature pad, a constant temperature container, a constant temperature system and a constant temperature control method. The functions of heating the container and keeping the container at a constant temperature are realized by generating eddy currents between a metal sheet and a transmitting coil and transferring heat to the bottom of the container.

[0003] However, the power supply of general heat-preserving pads is relatively low, and the circuit generally has a self-protection function. When the power is too large, the pad will always be in a self-protection state. In order to obtain a good heat-preserving effect, existing heat-preserving containers are often made of metal materials. And in order to improve the heating effect, the heating metal sheet is generally embedded in the bottom of the container. However, the magnetic field range generated by the transmitting coil is limited. Therefore, generally, the metal sheet and the transmitting coil are very close, and the bottom of the container will generally be placed in the magnetic field together. If the material of the heat-preserving container is metal, the container and the metal sheet at the bottom of the container will generate eddy currents together with the transmitting coil. In this way, too large power will trigger the self-protection function of the circuit, and the circuit efficiency is low. Therefore, when the heat-preserving container is made of metal, a wireless power supply circuit that does not heat the metal container by generating eddy currents between the metal sheet at the bottom of the container and the receiving coil is needed. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a wireless power supply circuit applied to container heating. By converting the alternating current energy received by the receiving coil into direct current, it supplies power to the main control module, the temperature control module and the heating module. The working state of the heating module is controlled by the temperature control module. The heating module is not close to the receiving coil, and the heating method of the container is converted from eddy current heating to electric energy supply heating. Therefore, the metal container and the heating module can be far away from the transmitting coil, avoiding the problem that the metal container is prone to generate eddy currents with the transmitting coil when using eddy current heating, thus triggering the self-protection of the circuit.

[0005] To solve the above technical problems, the utility model adopts the following solutions:

[0006] A wireless power supply circuit applied to container heating includes a receiving coil for communicating with a wireless charging module and receiving the energy transmitted by the wireless charging module, and also includes a main control module, a temperature control module, and a heating module. The main control module is used to convert the energy received by the receiving coil into current and voltage and supply power to the temperature control module and the heating module. The temperature control module is used to detect the temperature at the bottom of the container in real time and control the working state of the heating module according to the detected temperature.

[0007] In some optional embodiments, the temperature control module includes a temperature control MCU, a temperature sensor and a power control electronic switch respectively electrically connected to the temperature control MCU. The temperature sensor is used to detect the temperature at the bottom of the container in real time. The temperature control MCU is electrically connected to the main control module, and the output end of the power control electronic switch is connected to the heating module.

[0008] In some optional embodiments, the heating module uses a temperature regulating sheet.

[0009] In some optional embodiments, the temperature regulating sheet is placed in a ring shape at the bottom of the container.

[0010] In some optional embodiments, the temperature regulating sheet is made of one of a PI heating sheet, a PTC heating sheet, carbon fiber heating, a silica gel heating sheet, a PET heating sheet, a semiconductor refrigeration sheet, a carbon fiber silica heating wire or a PTC heating wire.

[0011] In some optional embodiments, the main control module includes a main control MUC, a full-bridge synchronous rectification module and a modulation and demodulation module respectively connected to the main control MCU, an overvoltage protection circuit electrically connected to the full-bridge rectification module, a voltage stabilization module electrically connected to the overvoltage protection circuit. The receiving coil is electrically connected to the full-bridge rectification module and the modulation and demodulation module respectively. The main control MCU communicates with the wireless charging module through the modulation and demodulation module and the receiving coil.

[0012] In some optional embodiments, the full-bridge synchronous rectification module includes a logic detection circuit, a rectification circuit and a drive circuit. The logic detection circuit is electrically connected to the main control MCU, the drive circuit is respectively electrically connected to the logic detection circuit and the rectification circuit, and the rectification circuit is connected to the receiving coil.

[0013] In some optional embodiments, the rectification circuit includes 4 N-MOSFETs, and the 4 N-MOSFETs are connected into a rectifier bridge structure for rectifying the energy received by the receiving coil and outputting it to provide a starting voltage for the main control MCU.

[0014] In some optional embodiments, the voltage stabilization module uses an LDO voltage regulator.

[0015] The beneficial effects of the present utility model:

[0016] A wireless power supply circuit for container heating according to the present utility model. The main control module converts the AC power energy received by the receiving coil into DC power to supply power to the main control module, the temperature control module, and the heating module. And the working state of the heating module is controlled by the temperature control module. The temperature control module controls the working state of the heating module according to the temperature at the bottom of the container. When the temperature at the bottom of the container reaches the set temperature, it controls the heating module to pause working. When the temperature at the bottom of the container is lower than the set temperature, it controls the heating module to work to heat the container, thereby realizing the constant temperature function at the bottom of the container.

[0017] In this application, the metal container can be separated from the receiving coil, so that the metal container and the heating module are far away from the magnetic field area, while the receiving coil is close to the magnetic field. The heating mode is controlled by the temperature control module, and the heating module is not close to the receiving coil. The original heating method for the container is converted from eddy current heating to electric energy supply heating. Therefore, the metal container and the heating module can be far away from the transmitting coil, avoiding the problem that when using eddy current heating, the metal container needs to be close to the magnetic field area together with the metal sheet, which may cause eddy currents to be generated between the metal container and the transmitting coil, thus triggering the self - protection of the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the functional block diagram of the wireless power supply circuit provided by the embodiment of the present utility model;

[0019] Figure 2 It is the internal block diagram of the main control module chip provided by the embodiment of the present utility model;

[0020] Figure 3 It is the specific circuit connection schematic diagram of the temperature control module provided by the embodiment of the present utility model;

[0021] Figure 4 is Figure 3 the pin schematic diagram of the temperature control MCU chip in DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following will further describe the present utility model in detail in conjunction with the embodiments and the drawings, but the embodiments of the present utility model are not limited thereto.

[0023] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "rear", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present utility model is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0024] In the description of the present utility model, it should also be noted that, unless otherwise clearly specified and defined, the terms "arranged", "provided with", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0025] The present utility model will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments:

[0026] Embodiment 1:

[0027] As Figures 1 to 2 shown, this embodiment provides a wireless power supply circuit applied to container heating, including a receiving coil for communicating with a wireless charging module and receiving the energy transmitted by the wireless charging module, and further including a main control module, a temperature control module, and a heating module. The main control module is used to convert the energy received by the receiving coil into current and voltage and supply power to the temperature control module and the heating module. The temperature control module is used to detect the temperature at the bottom of the container in real time and control the working state of the heating module according to the detected temperature.

[0028] Specifically, the wireless charging module is directly connected to the power supply. The wireless charging module includes a transmitting MCU, a frequency oscillator electrically connected to the transmitting MCU respectively, a transmitting coil, and the frequency oscillator is electrically connected to the transmitting coil. The transmitting coil forms an energy magnetic field under the action of the power supply. When the receiving coil approaches the magnetic field, an alternating current is generated by magnetic field induction. The receiving coil transmits the generated alternating current to the main control module. The main control module converts the alternating current into direct current to supply power to the main control module, the temperature control module, and the heating module. The temperature control module controls the working state of the heating module according to the temperature at the bottom of the container. When the temperature at the bottom of the container reaches the set temperature, the heating module is controlled to suspend working. When the temperature at the bottom of the container is lower than the set temperature, the heating module is controlled to work to heat the container, thereby realizing the constant temperature function at the bottom of the container.

[0029] In a specific embodiment, the temperature control module includes a temperature control MCU, a temperature sensor and a power control electronic switch which are electrically connected to the temperature control MCU respectively. The temperature sensor is used to detect the temperature at the bottom of the container in real time. The temperature control MCU is electrically connected to the main control module, and the output end of the power control electronic switch is connected to the heating module. Among them, the temperature sensor adopts an NTC temperature sensor. When the main control module outputs stable voltage and current to the temperature control MCU, the temperature control MCU displays the temperature according to the temperature parameters detected by the temperature sensor. If the detected temperature reaches the set temperature, the temperature control MCU outputs information to turn on the power control electronic switch. At this time, the heating module works. When the detected temperature reaches the set value, the temperature control MCU stops outputting information to close the power switch, and the heating module stops working. As Figure 3 、 Figure 4 shown, a specific implementation circuit is given. Each device in the figure is connected using existing technologies. Those skilled in the art can achieve the temperature control function through the circuit connection in Figure 3 , and it will not be elaborated herein

[0030] The heating module in this application adopts a temperature regulating sheet, which is designed according to the cup shape of the container, such as annular, disc-shaped or square. The temperature regulating sheet is closely attached to the bottom of the container, and its function is to heat up to keep the water in the cup at a certain temperature. The temperature regulating sheet is made of electrothermal materials, and its materials include: PI heating sheet, PTC heating sheet, carbon fiber heating, silicone heating sheet, PET heating sheet, semiconductor refrigeration sheet, carbon fiber silicone heating wire, or PTC heating wire. The function of the heating module is to heat the container to keep the water in the container at a certain temperature. In this application, the original heating method of generating eddy currents through a metal sheet and an emission coil to heat the container is changed to the method of heating by energizing the temperature regulating sheet. In this way, the temperature control MCU controls the working state of the heating module by controlling the power control electronic switch. The heating method is no longer to transfer heat to the bottom of the container by generating eddy currents between the metal sheet at the bottom of the container and the emission coil. The metal container and the heating module at the bottom can be designed to be far away from the magnetic field generated by the emission coil, thus avoiding the self-protection function of the circuit triggered by the eddy currents generated between the metal container and the emission coil

[0031] In the specific implementation process, as Figure 2As shown in the figure, the main control chip is used to convert the alternating current generated by the receiving coil into direct current. The main control module includes a main control MCU, a full-bridge synchronous rectification module and a modulation and demodulation module respectively connected to the main control MCU, an overvoltage protection circuit electrically connected to the full-bridge rectification module, and a voltage stabilization module electrically connected to the overvoltage protection circuit. The receiving coil is electrically connected to the full-bridge rectification module and the modulation and demodulation module respectively. The main control MCU communicates with the wireless charging module through the modulation and demodulation module and the receiving coil. The voltage stabilization module uses an LDO voltage regulator. The modulation and demodulation module includes an ASK modulation circuit and an FSK demodulation circuit to realize two-way wireless charging communication between the main control module and the wireless charging module.

[0032] Among them, the full-bridge synchronous rectification module includes a logic detection circuit, a rectification circuit and a drive circuit. The logic detection circuit is electrically connected to the main control MCU, the drive circuit is respectively electrically connected to the logic detection circuit and the rectification circuit, and the rectification circuit is connected to the receiving coil. The rectification circuit includes 4 N-MOSFETs, and the 4 N-MOSFETs are connected into a rectifier bridge structure to rectify the energy received by the receiving coil and output it to provide a starting voltage for the main control MCU. The full-bridge synchronous rectification module in this embodiment uses a common rectifier bridge, which will not be elaborated in this article.

[0033] The working principle and usage process of this embodiment are as follows:

[0034] The wireless power supply circuit of this application is placed at the bottom of the container. When the container is placed in the area where the wireless charging module is located, the transmitting coil forms an energy magnetic field under the action of the power supply. When the receiving coil approaches the magnetic field, an alternating current is induced by the magnetic field. Initially, the alternating current input by the receiving coil will flow through the parasitic diode of the N-MOSFET, and the parasitic diode rectifies and outputs to provide a starting voltage for the main control MCU chip. After the main control MCU chip is powered on, the main control MCU chip switches the working mode of the rectifier bridge according to the load current. When the load is light, the rectifier bridge works in the asynchronous mode (parasitic diode mode), and when the load is heavy, it works in the synchronous mode (MOSFET switch mode) to ensure high efficiency and high stability of wireless charging; the function of the overvoltage protection circuit for the rectified voltage is: when the rectified voltage VRECT exceeds 15V (the rectified voltage threshold level can be configured by external software), the VRECT voltage clamping function will be triggered to limit the VRECT voltage.

[0035] Due to the free-position characteristic of wireless charging, the rectified voltage VRECT is not a stable voltage, and there will be a large fluctuation in the rectified voltage VRECT during the process of moving the charging device. The main control MCU chip integrates an LDO voltage regulator, and the rectified voltage VRECT provides a stable DC voltage to the subsequent load after passing through the internal voltage-regulating LDO. Both the output voltage and current of the voltage-regulating LDO can be set by software. The voltage setting range is 3.6V to 9V, with a step of 50mV; the output current limiting setting range is 0 to 1600mA, with a step of 50mA. The voltage-regulating LDO has safety protection functions such as input undervoltage protection, input dynamic regulation (Dynamic Power Management, DPM), output overcurrent protection, and output current limiting. When the charging device moves or is displaced, the rectified voltage VRECT will drop. When it drops below the DPM threshold of the LDO, the voltage-regulating LDO will automatically reduce the output current to maintain the continuity of wireless charging and improve the anti-displacement ability of wireless charging.

[0036] When the voltage-regulating module outputs stable voltage and current to the temperature control MCU, the MCU displays the temperature according to the parameters fed back by the temperature sensor; if the temperature reaches the pre-set temperature, the temperature control MCU outputs a control signal to turn on the electronic power switch. At this time, the heating module works. When the detected temperature reaches the set value, the temperature control MCU outputs a control signal (such as a low level) to turn off the electronic power switch, and the heating module stops working, thereby realizing the heating and constant-temperature functions of the bottom of the container.

[0037] It can be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principle of the present invention, however, the present invention is not limited thereto. For those of ordinary skill in the art, various deformations and improvements can be made without departing from the spirit and essence of the present invention, and these deformations and improvements are also regarded as the protection scope of the present invention.

Claims

1. A wireless power supply circuit for container heating, comprising a receiving coil for communicating with a wireless charging module and receiving energy sent by the wireless charging module, characterized in that: It also includes a main control module, a temperature control module and a heating module. The main control module is used to convert the energy received by the receiving coil into current and voltage and supply power to the temperature control module and the heating module. The temperature control module is used to detect the temperature of the bottom of the container in real time and control the working state of the heating module according to the detected temperature.

2. The wireless power supply circuit for container heating according to claim 1, characterized in that: The temperature control module includes a temperature control MCU, a temperature sensor and a power control electronic switch electrically connected to the temperature control MCU respectively. The temperature sensor is used to detect the temperature of the bottom of the container in real time. The temperature control MCU is electrically connected to the main control module, and the output end of the power control electronic switch is connected to the heating module.

3. The wireless power supply circuit for container heating according to claim 1, characterized in that: The heating module adopts a temperature regulating sheet.

4. The wireless power supply circuit for container heating according to claim 3, characterized in that: The temperature regulating sheet is in the shape of a ring and is placed at the bottom of the container.

5. The wireless power supply circuit for container heating according to claim 3, characterized in that: The temperature regulating sheet is made of one of PI heating sheet, PTC heating sheet, carbon fiber heating sheet, silicone heating sheet, PET heating sheet, semiconductor cooling sheet, carbon fiber silicone heating wire or PTC heating wire.

6. The wireless power supply circuit for container heating according to claim 1, characterized in that: The main control module includes a main control MUC, a full-bridge synchronous rectification module and a modulation and demodulation module respectively connected to the main control MCU, an overvoltage protection circuit electrically connected to the full-bridge rectification module, a voltage stabilizing module electrically connected to the overvoltage protection circuit, and a receiving coil electrically connected to the full-bridge rectification module and the modulation and demodulation module respectively. The main control MCU communicates with the wireless charging module through the modulation and demodulation module and the receiving coil.

7. The wireless power supply circuit for container heating according to claim 6, characterized in that: The full-bridge synchronous rectification module includes a logic detection circuit, a rectification circuit and a drive circuit. The logic detection circuit is electrically connected to the main control MCU, the drive circuit is electrically connected to the logic detection circuit and the rectification circuit respectively, and the rectification circuit is connected to the receiving coil.

8. The wireless power supply circuit for container heating according to claim 7, characterized in that: The rectifier circuit includes four N-MOSFETs, which are connected to form a rectifier bridge structure and are used to rectify the energy received by the receiving coil and output it to provide a starting voltage for the main control MCU.

9. The wireless power supply circuit for container heating according to claim 6, characterized in that: The voltage regulator module uses an LDO regulator.

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