Embedded control circuit for distributed plantar pressure acquisition equipment

Abstract

The utility model relates to an embedded control circuit for distributed plantar pressure acquisition equipment, which is provided with a control circuit embedded in the distributed plantar pressure acquisition equipment. The control circuit comprises a main control module, a power supply module, a communication module, a digital-to-analog conversion module, a signal adjusting module, an analog-to-digital conversion module, a multiplexing module and a storage module, and the main control module is in bidirectional communication connection with the digital-to-analog conversion module, the analog-to-digital conversion module, the communication module and the storage module; the master control module is connected to the multiplexing module through the digital-to-analog conversion module, the output end of the multiplexing module is connected to the distributed plantar pressure sensor, and the distributed plantar pressure sensor is connected to the analog-to-digital conversion module through the signal adjusting module. The power supply module comprises a power supply switching module and a power supply conversion module for converting the voltage into output circuits with different voltages, and the power supply switching module and the power supply conversion module are both connected with the main control module. The device is ingenious in structure, convenient and practical.

Description

Technical Field

[0001] The utility model relates to the field of distributed plantar pressure collection, in particular to an embedded control circuit for distributed plantar pressure collection equipment. Background Art

[0002] With the continuous development of technology, people can achieve multi-field and multi-functional technological breakthroughs based on the collection of pressure data. In the collection of pressure data, the distributed pressure measurement system can break through more application scenarios and application fields because it uses distributed plantar pressure sensors. The accuracy and efficiency of the detection data used to judge the distributed pressure measurement system have always been the key factors for whether the performance of the distributed pressure measurement system is good. The key to determining this key factor is the design of the acquisition control circuit in its acquisition equipment.

[0003] Existing distributed pressure acquisition equipment is generally powered by an external power supply or by the power supply of an internal battery. When the internal battery is powered, the external power supply must be in a power-off state. Otherwise, when the internal battery is powered, the external power supply will also charge the internal battery at the same time. The simultaneous charging and discharging of the internal battery will cause battery loss. Therefore, it is necessary to develop a control circuit that can automatically switch between external power supply and internal power supply. Utility Model Content

[0004] The purpose of the utility model is to provide a control circuit for a distributed plantar pressure acquisition device, which has a sophisticated structure and can realize flexible switching between external USB power supply and internal battery power supply. When the external USB power supply is cut off, it automatically switches to internal battery power supply and performs voltage regulation. When the external USB power supply is used, the internal battery power supply is cut off, and the internal battery can also be charged while the external USB power supply is used. It is convenient and practical.

[0005] The technical solution for achieving the purpose of the utility model is as follows: the utility model has a control circuit connected to a distributed plantar pressure sensor, the control circuit is embedded and installed in a distributed plantar pressure acquisition device, the control circuit includes a main control module, a power module that is communicatively connected to the main control module and can receive a control signal sent by the main control module, a communication module that can be connected to a PC, a digital-to-analog conversion module, a signal conditioning module for signal amplification and signal filtering, an analog-to-digital conversion module, a multiplexing module and a storage module, the main control module is respectively bidirectionally connected to the digital-to-analog conversion module, the analog-to-digital conversion module, the communication module, and the storage module, the main control module is connected to the multiplexing module through the digital-to-analog conversion module, the output end of the multiplexing module is connected to the distributed plantar pressure sensor, the distributed plantar pressure sensor is connected to the analog-to-digital conversion module through the signal conditioning module, the power module includes a power switching module that switches between external USB power supply and internal battery power supply, and a power conversion module that converts output circuits of different voltages, and the power switching module and the power conversion module are both connected to the main control module.

[0006] Furthermore, the main control module is provided with a DAC conditioning circuit, a battery power detection circuit, a system button pin detection circuit, each indicator light status control pin circuit, and a switch circuit, and the switch circuit is formed by a PMOS tube and an NMOS tube.

[0007] Furthermore, the above-mentioned communication module includes a USB-USART communication module and a WIFI communication module. The USB-USART communication module adopts an FT232RQ chip, the WIFI communication module adopts a BW16 chip module, the power supply of the WIFI communication module is on and off controlled by the main control module, and the communication frequency band of the WIFI module includes 2.4GHz and 5GHz.

[0008] Furthermore, the above-mentioned output circuit includes a 5.3V power supply output circuit, a 3.3V power supply output circuit, a -3V power supply output circuit and a battery charging circuit. The 5.3V power supply output circuit adopts a TPS63070 chip, the 3.3V power supply output circuit adopts a TPS563201 chip, the -3.3V power supply output circuit adopts a TPS63710 chip, and the battery charging circuit adopts a TP4056 chip.

[0009] Furthermore, the power switching module is constructed by a Schottky diode and a PMOS tube.

[0010] Furthermore, the above analog-to-digital conversion module adopts an 8-bit sampling AD7908 chip.

[0011] Furthermore, the multiplexing module adopts the CD74HC4051 chip.

[0012] Furthermore, the above-mentioned storage module includes an EEPROM storage module for setting parameter storage, and an SD / TF card storage module for storing collected data.

[0013] The utility model has positive effects: (1) The utility model realizes the miniaturization and wearability of the distributed plantar pressure acquisition device by embedding the control circuit in the distributed plantar pressure acquisition device, and by setting the power module to a power switching module and a power conversion module, the power switching module can switch between the two power supply modes of external USB power supply and internal battery power supply in real time. When the external USB power supply is used, the internal battery power supply is cut off, and the internal battery can also be charged while the external USB power supply is used. When the external USB power supply is cut off, it automatically switches to the internal battery power supply, avoiding the battery loss caused by the simultaneous charging and discharging of the battery in the prior art. The internal battery is embedded in the distributed plantar pressure acquisition device, so the replacement of the internal battery is more inconvenient. Therefore, the power switching module is set in the control circuit. On the one hand, it can reduce the loss of the internal battery and ensure the service life of the internal battery. On the other hand, it can also maintain the continuous operation of the control circuit and avoid the control circuit from being instantly shut down due to the sudden interruption of the external USB power supply. The structure is ingenious and stable and practical.

[0014] (2) The utility model sets a DAC conditioning circuit, a battery power detection circuit, a system button pin detection circuit, and each indicator light status control pin circuit in the main control module. In the process of collecting the voltage of the internal battery, the PMOS tube and the NMOS tube build a switch circuit. Before the device is shut down, the main control module controls the output voltage of the IO pin, thereby shutting off the voltage divider circuit for battery voltage collection, avoiding long-term voltage division by the voltage divider resistor, which may cause loss or damage to the internal battery, and further protecting the internal battery. It is safe and practical.

[0015] (3) The utility model configures the communication module to be a USB-USART communication module and a WIFI communication module, so that the signal transmission between the communication module and the PC end can be applied to both wired communication and wireless communication. The power supply of the WIFI communication module is turned on and off by controlling the MOS tube switch circuit through the IO pin of the main control module. When the module is not in use, the power supply of the module is cut off, which greatly reduces the power consumption. Compared with Bluetooth communication, WIFI communication is more stable and high-speed, supports multi-band communication, and has stronger anti-interference ability.

[0016] (4) The utility model sets the output circuit to 5.3V, 3.3V and -3V. Each output circuit can be suitable for both the 5V voltage of the external USB power supply and the 3.7V voltage of the internal battery. At the same time, a TVS transient voltage suppression circuit is added to protect the components from damage due to overvoltage static electricity and surges. The battery charging circuit adopts the TP4056 chip, which has a programmable charging current of up to 1A, an internal PMOSFET architecture and an anti-reverse charging circuit, and an internal battery temperature detection function. It can perform real-time detection of the temperature of the internal battery, which is convenient and practical.

[0017] (5) The utility model configures the power switching module to be a low-voltage drop Schottky diode and a PMOS tube. On the one hand, it can effectively switch between external USB power supply and internal battery power supply. On the other hand, the constructed switching structure is easier to form and has a lower cost.

[0018] (6) The utility model configures the analog-to-digital conversion module to adopt an AD7908 chip with 8-bit sampling, thereby being able to achieve a change in sampling resolution between 8-bit, 10-bit and 12-bit without changing the hardware circuit, and has good adjustability and applicability.

[0019] (7) The utility model sets a multiplexing module to control 8-choice 1 output through 3 input terminals, time-division multiplexing, rapid switching, stable output, greatly saving AD sampling ports, and is convenient and practical.

[0020] (8) The utility model stores setting parameters by setting an EEPROM storage module and collects data by setting an SD / TF card storage module. When the pressure-dividing plantar acquisition device cannot provide a WIFI network or there is no host computer, the SD / TF card storage module is selected for offline storage to save the data to be collected in a timely manner. When the module is not in use, the power supply of the module is cut off, which greatly reduces power consumption and is convenient and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to make the content of the utility model easier to understand, the utility model is further described in detail according to specific embodiments and in conjunction with the accompanying drawings.

[0022] Figure 1 It is a structural schematic diagram of an embedded control circuit for a distributed plantar pressure acquisition device in the utility model;

[0023] Figure 2 This is a circuit diagram of the main control module in the utility model;

[0024] Figure 3 It is a circuit diagram of the power switching module in the utility model;

[0025] Figure 4 This is a circuit diagram of a 5.3V power output circuit in the utility model;

[0026] Figure 5 This is a circuit diagram of a 3.3V power output circuit in the utility model;

[0027] Figure 6 The circuit diagram of the -3V power supply output circuit in the utility model;

[0028] Figure 7 It is a circuit diagram of a battery charging circuit in the utility model;

[0029] Figure 8 It is a circuit diagram of the USB-USART communication module in the utility model;

[0030] Fig. 9 This is a circuit diagram of the WIFI communication module in the utility model;

[0031] Fig.10 It is a circuit diagram of the signal conditioning module in the utility model;

[0032] Fig.11 The circuit diagram of the analog-to-digital conversion module in the utility model;

[0033] Fig.12 It is a circuit diagram of the EEPROM storage module in the utility model;

[0034] Fig.13 This is a circuit diagram of the SD / TF card storage module in the utility model;

[0035] Fig.14 It is a circuit diagram of the multiplexing module in the utility model. DETAILED DESCRIPTION

[0036] See Figures 1 to 14The utility model relates to an embedded control circuit for a distributed plantar pressure acquisition device, which has a control circuit connected to a distributed plantar pressure sensor 9, and the control circuit is embedded and installed in the distributed plantar pressure acquisition device. The control circuit includes a main control module 1, a power supply module 2 that is communicatively connected to the main control module 1 and can receive a control signal sent by the main control module 1, a communication module 3 that can be connected to a PC, a digital-to-analog conversion module 4, a signal adjustment module 5 for signal amplification and signal filtering, an analog-to-digital conversion module 6, a multiplexing module and a storage module 8, and the main control module 1 is respectively connected to the digital-to-analog conversion module 1 and the digital-to-analog conversion module 1. Block 4, analog-to-digital conversion module 6, communication module 3, and storage module 8 are bidirectionally connected for communication. The main control module 1 is connected to the multiplexing module through the digital-to-analog conversion module 4, and the output end of the multiplexing module is connected to the distributed plantar pressure sensor 9. The distributed plantar pressure sensor 9 is connected to the analog-to-digital conversion module 6 through the signal conditioning module 5. The power supply module 2 includes a power switching module 21 for switching between external USB power supply and internal battery power supply, and a power conversion module 22 for converting into output circuits of different voltages. The power switching module 21 and the power conversion module 22 are both connected to the main control module 1.

[0037] The main control module 1 uses the ARM chip STM32F405RGT6 as the core processor, which is a 32-bit advanced MCU based on the Cortex-M4ARM core, with a main frequency of up to 168MHz, 1MB of FLASH and 192KB of RAM.

[0038] The main control module 1 is provided with a DAC conditioning circuit, a battery power detection circuit, a system key pin detection circuit, each indicator light status control pin circuit, and a switch circuit, and the switch circuit is formed by a PMOS tube and an NMOS tube.

[0039] In the voltage acquisition circuit of the internal battery, a switch circuit formed by a PMOS tube and an NMOS tube is used. Before the distributed plantar pressure acquisition device is shut down, the main control module 1 controls the output voltage of the IO pin, thereby turning off the voltage divider circuit for internal battery voltage acquisition to avoid long-term voltage division of the voltage divider circuit and cause loss of the internal battery.

[0040] The power switching module 21 can realize flexible switching between USB power supply and internal battery power supply. When the external USB is in the power supply state, the circuit automatically switches to the external USB power supply state and charges the internal battery at the same time. When the external USB loses power, the circuit automatically switches to the internal battery power supply state, effectively avoiding the simultaneous charging and discharging of the internal battery, reducing the loss of the internal battery, and extending the battery life. The power switching module 21 is constructed of a low-voltage drop Schottky diode and a PMOS tube.

[0041] The output circuit includes a 5.3V power output circuit, a 3.3V power output circuit, a -3V power output circuit and a battery charging circuit;

[0042] The 5.3V power output circuit uses the TPS63070 chip, which has a high-efficiency single-inductor buck / boost converter with a 3.6A switching current and an input voltage range of 2V to 16V, which is suitable for both external USB 5V power supply and internal battery 3.7V power supply. In addition, a TVS transient voltage suppression circuit is added to the circuit to protect various components from damage caused by overvoltage static electricity and surges;

[0043] The 3.3V power output circuit uses the TPS563201 chip, which is a simple and easy-to-use 3A synchronous rectification buck converter in a 6-pin SOT-23 package. A TVS transient voltage suppression circuit is added to the circuit to protect the components from damage caused by overvoltage static electricity and surges.

[0044] -3.3V power output circuit uses TPS63710 chip, which is a low-noise synchronous rectification inverting buck converter with wide input voltage and adjustable output voltage range from negative 1V to negative 5.5V. And TVS transient voltage suppression circuit is added to the circuit to protect various components from damage by overvoltage static electricity and surge;

[0045] The battery charging circuit uses the TP4056 chip, which has a programmable charging current of up to 1A, an internal PMOSFET architecture and an anti-reverse charging circuit, uses constant voltage / constant current charging, has a battery temperature detection function, and an accuracy of ±1% of the 4.2V preset charging voltage.

[0046] The communication module 3 includes a USB-USART communication module 32 and a WIFI communication module 31. The USB-USART communication module 32 adopts a FT232RQ chip, and the WIFI communication module 31 adopts a BW16 chip module. The power supply of the WIFI communication module 31 is on and off controlled by the main control module 1, and the communication frequency band of the WIFI module includes 2.4GHz and 5GHz.

[0047] The power supply of the WIFI communication module 31 is switched on and off by building the IO pin of the main control module 1 to control the MOS tube switch circuit. When the module is not used, the power supply of the WIFI communication module 3 is cut off, which can greatly reduce power consumption. In addition, the control circuit supports automatic connection to the default WIFI in wireless mode, and also supports wired modification of WIFI information to connect to other WIFI networks. Timely adjustments can be made according to the actual use environment and the network of the use environment. Compared with Bluetooth communication, the WIFI communication module 31 is more stable, faster and has stronger anti-interference ability, supports multi-band communication and has a longer transmission distance;

[0048] The USB-USART communication module 32 uses the FT232RQ chip, which is a USB to serial port conversion chip. The serial port baud rate can be set to 3Mbps at most. The wired data transmission is very stable. When the collected data of the SD card needs to be read, the wired USART can be used to communicate with the host computer, thereby achieving faster and more accurate data transmission. If you want to switch the WIFI network connection, you can use the wired mode for one-click configuration.

[0049] The analog-to-digital conversion module 6 uses an 8-bit sampling AD7908 chip, which is an 8-channel 8-bit analog-to-digital converter with a high-speed SPI interface and a maximum throughput of 1MSPS. The reference voltage is set through the DAC output channel of the MCU via an operational amplifier; due to the pin compatibility of the AD7908, AD7918 and AD7928 chips, the sampling resolution can be changed to 8, 10 and 12 bits without changing the hardware circuit.

[0050] The multiplexing module uses the CD74HC4051 chip, which is a digitally controlled bidirectional analog switch with low on-resistance, fast switching and propagation speed characteristics. The output conversion is controlled by the IO pin of the processor, which can save ADC resources.

[0051] The storage module 8 includes an EEPROM storage module 81 for storing setting parameters and an SD / TF card storage module 82 for storing collected data.

[0052] SD / TF card is used to store collected data. When the collection device cannot provide WIFI network or there is no host computer, you can choose to use SD card offline storage to save the data to be collected in time. In addition, the power supply of SD / TF card storage module 82 is realized by building the IO pin of the main control module 1 to control the MOS tube switch circuit. When the SD / TF card storage module 82 is not used, the power supply of the module is cut off, which can greatly reduce power consumption. The SD card is embedded, and the data of the SD card can be read through the wired communication between the host computer and the distributed plantar pressure collection device without removing the SD card.

[0053] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An embedded control circuit for a distributed plantar pressure acquisition device, having a control circuit connected to a distributed plantar pressure sensor, characterized in that: The control circuit is embedded and installed in a distributed plantar pressure acquisition device. The control circuit includes a main control module, a power module that is communicatively connected to the main control module and can receive a control signal sent by the main control module, a communication module that can be connected to a PC, a digital-to-analog conversion module, a signal adjustment module for signal amplification and signal filtering, an analog-to-digital conversion module, a multiplexing module and a storage module. The main control module is bidirectionally connected to the digital-to-analog conversion module, the analog-to-digital conversion module, the communication module, and the storage module respectively. The main control module is connected to the multiplexing module through the digital-to-analog conversion module, the output end of the multiplexing module is connected to a distributed plantar pressure sensor, and the distributed plantar pressure sensor is connected to the analog-to-digital conversion module through the signal adjustment module. The power module includes a power switching module that switches between external USB power supply and internal battery power supply, and a power conversion module that converts into output circuits of different voltages. The power switching module and the power conversion module are both connected to the main control module.

2. The embedded control circuit for the distributed plantar pressure acquisition device according to claim 1, characterized in that: The main control module is provided with a DAC conditioning circuit, a battery power detection circuit, a system key pin detection circuit, each indicator light status control pin circuit, and a switch circuit, and the switch circuit is formed by a PMOS tube and an NMOS tube.

3. The embedded control circuit for the distributed plantar pressure acquisition device according to claim 1, characterized in that: The communication module includes a USB-USART communication module and a WIFI communication module. The USB-USART communication module adopts an FT232RQ chip, the WIFI communication module adopts a BW16 chip module, the power supply of the WIFI communication module is on and off controlled by a main control module, and the communication frequency band of the WIFI module includes 2.4GHz and 5GHz.

4. The embedded control circuit for the distributed plantar pressure acquisition device according to claim 1, characterized in that: The output circuit includes a 5.3V power output circuit, a 3.3V power output circuit, a -3V power output circuit and a battery charging circuit. The 5.3V power output circuit uses a TPS63070 chip, the 3.3V power output circuit uses a TPS563201 chip, the -3.3V power output circuit uses a TPS63710 chip, and the battery charging circuit uses a TP4056 chip.

5. The embedded control circuit for the distributed plantar pressure acquisition device according to claim 1, characterized in that: The power switching module is constructed by a Schottky diode and a PMOS tube.

6. The embedded control circuit for the distributed plantar pressure acquisition device according to claim 1, characterized in that: The analog-to-digital conversion module uses an 8-bit sampling AD7908 chip.

7. The embedded control circuit for the distributed plantar pressure acquisition device according to claim 1, characterized in that: The multiplexing module adopts the CD74HC4051 chip.

8. The embedded control circuit for the distributed plantar pressure acquisition device according to claim 1, characterized in that: The storage module includes an EEPROM storage module for setting parameter storage and an SD / TF card storage module for storing collected data.

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