Internet of Things feeding metering circuit and feeding device

Abstract

The utility model provides an internet of things feeding metering circuit and feeding device, internet of things feeding metering circuit includes master control module, acquisition module, wireless module, display module and power supply module, acquisition module and wireless module are connected with master control module respectively, acquisition module acquires food weight signal and send to master control module; and the main control module sends the food weight processing signal to the display module for display, and sends the food weight processing signal to a terminal or a cloud through the wireless module. An anti-breakdown device is additionally arranged at a charging inlet, a filtering assembly is arranged at a power supply pin of a main control module, and the anti-breakdown device is connected between an electrical interface assembly and an external power supply and is used for absorbing energy of breakdown voltage with high pulse power, so that the whole circuit is protected from being damaged; the filtering assembly is arranged between the power interface of the main control module and the ground, so that the filtering effect can be achieved, electrostatic energy can be absorbed, the ESD electrostatic level of the product is improved, and more use scenes can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of feeding devices, and in particular to an Internet of Things feeding metering circuit and a feeding device. Background Art

[0002] As people's living standards improve, feeding devices as smart home products are gradually favored by the market. These devices usually include functions such as automatic feeding, timed feeding, and remote control, which greatly improve the quality of life. The feeding devices on the market currently have the following deficiencies in ESD electrostatic protection and USB signal transmission: Insufficient ESD electrostatic protection level: Many feeding devices do not fully consider the special environment of high altitude areas during design and manufacturing, resulting in the ESD electrostatic protection level failing to meet the requirements and being easily damaged when an ESD event occurs; USB signal transmission is susceptible to interference: When the USB serial port signal is directly connected to the MCU, the signal tolerance and sensitivity are low, and it is easily interfered by ESD events, resulting in data transmission errors or equipment failures; Lack of special protection measures: Existing feeding devices lack special protection measures in ESD electrostatic protection and USB signal transmission, and cannot effectively cope with the special environment of high altitude areas. Utility Model Content

[0003] In order to solve the above problems, the purpose of the utility model is to provide an Internet of Things feeding metering circuit and feeding device, which solves the problem of insufficient ESD electrostatic protection level of the feeding metering circuit / device by adding an anti-breakdown device at the charging inlet and setting a filtering component at the power pin of the main control module.

[0004] The utility model is realized by the following technical solutions:

[0005] An Internet of Things feeding metering circuit, comprising:

[0006] Main control module;

[0007] A collection module, the collection module is connected to the main control module, and is used to collect food weight signals and send them to the main control module; the main control module is used to process the food weight signals;

[0008] A wireless module, which is connected to the main control module and is used to transmit the processed food weight signal to the cloud or the terminal;

[0009] The power supply module includes an electrical interface component, a battery charging control chip, a battery and a DCDC conversion component which are connected in sequence; the electrical interface component is connected to an external power supply, the battery charging control chip is used to charge the battery, and the DCDC conversion component is used to convert the battery voltage into a power supply; the main control module, the sensor module, the acquisition module and the wireless module are all connected to the output end of the DCDC conversion component;

[0010] Among them, an anti-breakdown device is connected between the electrical interface component and the external power supply, and / or a filter component is connected between the power interface of the main control module and the power supply, and the other end of the filter component is grounded.

[0011] Furthermore, the electrical interface component includes a USB connector, an anti-breakdown device is connected between the USB connector and the external power supply, four positioning holes for fixing the USB connector are grounded through current-limiting resistors, and the CC1 pin and CC2 pin of the USB connector are both grounded through pull-down resistors.

[0012] Furthermore, the anti-breakdown device is a TVS diode.

[0013] Furthermore, the main control module includes a control chip, a storage component and a clock component connected to the control chip, and the power pins of the control chip are all provided with filter components.

[0014] Furthermore, the filtering component includes a capacitor group connected in parallel.

[0015] Furthermore, the acquisition module also includes a temperature sensor connected to the main control module, and the temperature sensor and the main control module are communicatively connected via an I2C bus.

[0016] Furthermore, the acquisition module includes an acquisition chip and a full-bridge pressure sensor connected to the acquisition chip, the full-bridge pressure sensor is used to acquire food weight signals, the acquisition chip is connected to the main control module, and the acquisition chip has an accuracy of 16 bits.

[0017] Furthermore, the metering circuit also includes a display module, including a PFC connector, a plurality of driving components and an RGB LED matrix connected in sequence; the PFC connector is connected to the main control module, and the driving component adopts a serial-in parallel-out shift register.

[0018] Furthermore, the driving component adopts SN74HCS595PWR.

[0019] A feeding device comprises the above-mentioned Internet of Things feeding metering circuit.

[0020] Compared with the prior art, the technical solution of the utility model and its beneficial effects are as follows:

[0021] (1) The metering circuit of the utility model adds an anti-breakdown device at the charging entrance, and sets a filter component at the power pin of the main control module. An anti-breakdown device is connected between the electrical interface component and the external power supply to absorb the energy of the breakdown voltage of the high pulse power, thereby protecting the entire circuit from damage. A filter component is set between the power interface of the main control module and the ground, which can both play a filtering role and absorb electrostatic energy, thereby improving the ESD static electricity level of the product to meet more usage scenarios.

[0022] (2) The acquisition module of the utility model includes an acquisition chip and a full-bridge pressure sensor connected to the acquisition chip. The acquisition chip has an accuracy of 16 bits. The reference voltage is 3.3V, so that the acquisition accuracy can reach 3.3V / 65535=50.35uV, which is mapped to the range of the transformer, that is, 0.2g, so that the acquisition accuracy meets the product requirements.

[0023] (3) The acquisition module of the utility model also includes a temperature sensor connected to the control chip. By increasing temperature acquisition to perform temperature compensation, the measurement error caused by temperature changes is reduced, thereby further improving the weighing accuracy.

[0024] (4) The LED driver of the present invention adopts a serial port to parallel port chip to reduce the number of MCU control IO ports and FPC connection line PINs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a principle block diagram of an Internet of Things feeding metering circuit provided by an embodiment of the utility model;

[0026] Figure 2 It is a circuit schematic diagram of a power supply module provided in an embodiment of the utility model;

[0027] Figure 3 It is a circuit schematic diagram of the main control module provided by the embodiment of the utility model;

[0028] Figure 4 It is a circuit schematic diagram of the acquisition module provided in the embodiment of the utility model;

[0029] Figure 5 It is a circuit schematic diagram of a temperature sensor provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the embodiment of the utility model clearer, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0031] See also Figure 1 , an Internet of Things feeding metering circuit, including a main control module, a collection module, a wireless module, a display module and a power supply module. The collection module and the wireless module are respectively connected to the main control module. The collection module collects food weight signals and sends them to the main control module; the main control module sends the processed food weight signals to the display module for display, and sends them to the terminal or the cloud through the wireless module. The power supply module includes an electrical interface component, a battery charging control chip, a battery and a DCDC conversion component connected in sequence. The electrical interface component is connected to an external power supply, the battery charging control chip charges the battery, and the DCDC conversion component converts the battery voltage into a power supply. The main control module, the sensor module, the collection module, the display module and the wireless module are all connected to the output end of the DCDC conversion component to obtain power. An anti-breakdown device is connected between the electrical interface component and the external power supply to absorb the energy of the breakdown voltage of the high pulse power, thereby protecting the entire circuit from damage. A filter component is arranged between the power interface of the main control module and the ground, which can both play a filtering role and absorb static energy, thereby improving the ESD static level of the product to meet more usage scenarios.

[0032] See also Figure 2 , the electrical interface component includes a USB connector J2. The USB connector J2 adopts UJ31-CH-G-SMT-TR-67. A square breakdown device is connected between the USB connector J2 and the external power supply. In this embodiment, a TVS diode D13 with a breakdown voltage of 7.2V and an ESD level of ±20kV is used. After testing, a 20kV breakdown voltage with a peak pulse power of 827W added to the USB port can be absorbed by the TVS diode D13. The four positioning holes for fixing the USB connector are grounded through resistor R9, the CC1 pin of the USB connector is grounded through resistor R7, and the CC2 pin of the USB connector is grounded through resistor R8. In this embodiment, the resistance values ​​of resistors R7 and R8 are both 5.1K. The type-c charging protocol setting is realized through the two pull-down resistors R7 and R8.

[0033] See also Figure 3The main control module includes a control chip U1, a storage component and a clock component connected to the control chip U1, and the power pins of the control chip U1 are all provided with a filter component, and the filter component includes a parallel capacitor group. Specifically, a capacitor C1 and a capacitor C3 are connected in parallel between the IOVDD pin and the power supply, and the other common end of the capacitor C1 and the capacitor C3 is grounded; a capacitor C2 and a capacitor C4 are connected in parallel between the AVDD pin and the power supply, and the other common end of the capacitor C2 and the capacitor C4 is grounded; a capacitor C5 and a capacitor C6 are connected in parallel between the DVDD pin and the power supply, and the other common end of the capacitor C5 and the capacitor C6 is grounded.

[0034] See also Figure 4 The acquisition module includes an acquisition chip U7 and a full-bridge pressure sensor connected to the acquisition chip U7. The full-bridge pressure sensor is used to collect food weight signals. The acquisition chip U7 is connected to the control chip U1. The acquisition chip has an accuracy of 16 bits. The reference voltage is 3.3V, and the accuracy is 3.3V / 65535=50.35uV. The range mapped to the transformer is 0.2g, thereby improving the acquisition accuracy. In this embodiment, the acquisition chip U7 uses NAU7802SGI.

[0035] See also Figure 5 The acquisition module also includes a temperature sensor U6 connected to the control chip U1, and the temperature sensor U6 is connected to the control chip U1 through an I2C bus. By increasing temperature acquisition for temperature compensation, the measurement error caused by temperature changes is reduced, thereby further improving the weighing accuracy.

[0036] The acquisition module also includes a three-axis acceleration sensor connected to the control chip U1, which is used to monitor whether the product is moved or overturned.

[0037] In this embodiment, the display module includes a PFC connector, four drivers and an RGB LED matrix connected in sequence. The PFC connector is connected to the control chip, and the driver adopts a serial input and parallel output shift register, such as SN74HCS595PWR. In this embodiment, 21 groups of three-primary color LED light groups are required on the display panel to display the food weight in real time, so 36 channels are required for control. This application uses 4 serial port to parallel port chips as drivers to reduce the number of control chip U1 control IO ports and FPC connection line PINs.

[0038] The above description shows and describes the preferred embodiments of the utility model. It should be understood that the utility model is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the utility model concept of this article through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not deviate from the spirit and scope of the utility model, and should be within the scope of protection of the claims attached to the utility model.

Claims

1. An Internet of Things feeding metering circuit, characterized in that: include: Main control module; A collection module, which is connected to the main control module and is used to collect food weight signals and send them to the main control module; The main control module is used to process food weight signals; A wireless module, which is connected to the main control module and is used to transmit the processed food weight signal to the cloud or the terminal; The power supply module includes an electrical interface component, a battery charging control chip, a battery and a DCDC conversion component which are connected in sequence; the electrical interface component is connected to an external power supply, the battery charging control chip is used to charge the battery, and the DCDC conversion component is used to convert the battery voltage into a power supply; the main control module, the sensor module, the acquisition module and the wireless module are all connected to the output end of the DCDC conversion component; Among them, an anti-breakdown device is connected between the electrical interface component and the external power supply, and / or a filter component is connected between the power interface of the main control module and the power supply, and the other end of the filter component is grounded.

2. The Internet of Things feeding metering circuit according to claim 1, characterized in that: The electrical interface component includes a USB connector, an anti-breakdown device is connected between the USB connector and the external power supply, four positioning holes for fixing the USB connector are grounded through current-limiting resistors, and the CC1 pin and CC2 pin of the USB connector are both grounded through pull-down resistors.

3. The Internet of Things feeding metering circuit according to claim 2, characterized in that: The anti-breakdown device is a TVS diode.

4. The Internet of Things feeding metering circuit according to claim 1, characterized in that: The main control module includes a control chip, a storage component and a clock component connected to the control chip, and the power pins of the control chip are all provided with filter components.

5. The Internet of Things feeding metering circuit according to claim 4, characterized in that: The filtering component includes a capacitor group connected in parallel.

6. The Internet of Things feeding metering circuit according to claim 1, characterized in that: The acquisition module also includes a temperature sensor connected to the main control module, and the temperature sensor and the main control module are communicatively connected via an I2C bus.

7. The Internet of Things feeding metering circuit according to claim 1, characterized in that: The acquisition module includes an acquisition chip and a full-bridge pressure sensor connected to the acquisition chip, the full-bridge pressure sensor is used to acquire food weight signals, the acquisition chip is connected to the main control module, and the acquisition chip has an accuracy of 16 bits.

8. The Internet of Things feeding metering circuit according to claim 1, characterized in that: It also includes a display module, including a PFC connector, a plurality of driving components and an RGB LED matrix connected in sequence; the PFC connector is connected to the main control module, and the driving component adopts a serial input and parallel output shift register.

9. The Internet of Things feeding metering circuit according to claim 8, characterized in that: The driving component adopts SN74HCS595PWR.

10. A feeding device, characterized in that: The invention comprises the Internet of Things feeding metering circuit as described in any one of claims 1 to 9.

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