Internet of Things voltmeter circuit

Abstract

The utility model relates to the technical field of electric appliances, and discloses an Internet of Things voltmeter circuit, which comprises a main control chip circuit, a power supply circuit and a voltage acquisition circuit, the main control chip circuit comprises a main control chip; the voltage acquisition circuit comprises an ADC (Analog to Digital Converter) acquisition chip and a plurality of acquisition ports electrically connected with the ADC acquisition chip; the power supply circuit is electrically connected with the main control chip circuit and the voltage acquisition circuit; power is supplied to the main control chip and the ADC acquisition chip; and the main control chip is also electrically connected with the ADC acquisition chip. The utility model solves the problem that the differential voltage cannot be directly measured in the prior art, and has the characteristic of being capable of detecting tiny voltage signals.

Description

TECHNICAL FIELD

[0001] The utility model relates to the electrical detection technical field more specifically, relate to a kind of internet of things voltmeter circuit. BACKGROUND

[0002] With the rapid development of Internet of Things technology, the application of intelligent devices and sensors is increasingly widespread. In the fields of industry, agriculture, transportation, smart home, etc., the demand for accurate measurement and monitoring of voltage is increasing. Although traditional voltmeters can measure voltage, their functions are single and cannot meet the diversified needs of data acquisition, transmission and processing in Internet of Things environment.

[0003] The prior art has a control circuit of a voltage reference source compensation coefficient voltmeter, which includes an MCU main control module. The MCU main control module is connected to a reference voltage module, a serial debugging module, a voltage dividing module, an LED and main control key module, a power module and a digital tube control module. The MCU main control module uses STC12C2052AD as the control core. During measurement, the voltage reference source compensation coefficient and the voltage dividing resistor network compensation coefficient can be set according to the actual situation (such as the measurement error of the measurement chip or the error of the resistor and capacitor). This can effectively improve the collection accuracy of the voltmeter. The voltage dividing module uses a resistor (1%) voltage dividing circuit to increase the measurement range. The power module can avoid the burning of the entire voltmeter circuit due to incorrect voltage connection during use. The digital tube control module no longer uses a resistor, but uses eight separate resistors. The single-chip microcomputer pins are directly used for driving, which can completely drive the digital tube. Under the condition of ensuring system stability, the cost of the entire device can be reduced.

[0004] However, the prior art cannot directly measure differential voltage. Therefore, how to design a voltage collection circuit that can directly measure differential voltage is a technical problem that needs to be solved in this technical field. Utility model content

[0005] The utility model provides an internet of things voltmeter circuit to solve the problem that the prior art cannot directly measure differential voltage. It has the characteristics of being able to detect small voltage signals.

[0006] To achieve the above-mentioned purpose of the utility model, the technical solutions adopted are as follows:

[0007] The application discloses an Internet of Things voltmeter circuit which comprises a master control chip circuit, a power supply circuit and a voltage collection circuit.

[0008] Preferably, the voltage collection circuit further comprises a voltage boosting chip, a reference voltage chip and a collection port; the input end of the voltage boosting chip is electrically connected with the output end of the power supply circuit; the output end of the voltage boosting chip is electrically connected with the input end of the reference voltage chip and the corresponding input end of the ADC collection chip respectively; the output end of the reference voltage chip is electrically connected with the corresponding input end of the ADC collection chip; and the output end of the ADC collection chip is electrically connected with the collection port.

[0009] Further, the power supply circuit is specifically a USB power supply and lithium battery charging circuit; when charging, the lithium battery charging chip is used to charge the lithium battery; and when discharging, the lithium battery is used to supply power to the master control chip and the ADC collection chip.

[0010] Further, the USB power supply and lithium battery charging circuit is further provided with a power supply selection circuit comprising a PMOS tube and a Schottky diode in parallel; the input end of the power supply selection circuit is electrically connected with the lithium battery charging chip; and the output end of the power supply selection circuit is electrically connected with the master control chip and the ADC collection chip.

[0011] Further, the application further comprises a type-c power supply and communication circuit; the type-c power supply and communication circuit comprises a type-c interface circuit and a serial port burning circuit; the type-c interface circuit comprises an interface chip; the serial port burning circuit comprises a serial port burning chip; the output end of the interface chip is electrically connected with the input end of the serial port burning chip; and the output end of the serial port burning chip is electrically connected with the master control chip.

[0012] Further, the application further comprises a downloading circuit; the downloading circuit comprises a reset circuit and a BOOT button circuit; the reset circuit comprises a reset switch which is electrically connected with the reset port of the master control chip; and the BOOT button circuit comprises a BOOT switch which is electrically connected with the BOOT end of the master control chip.

[0013] Further, the master control chip circuit further comprises a voltage stabilizing circuit and a filter circuit; the input end of the voltage stabilizing circuit is electrically connected with the output end of the power supply circuit; and the output end of the voltage stabilizing circuit is electrically connected with the input end of the filter circuit and the input end of the master control chip respectively.

[0014] Further, the Bluetooth communication circuit is further included; the Bluetooth communication circuit includes a Bluetooth chip; an input end of the Bluetooth chip is electrically connected with an output end of the voltage stabilizing circuit; and an output end of the Bluetooth chip is electrically connected with the master control chip.

[0015] Further, the power supply circuit and the Bluetooth communication circuit are both provided with LED display circuits, respectively used for indicating power supply and Bluetooth connection states.

[0016] Further, the power supply circuit and the Bluetooth communication circuit are both provided with LED display circuits, respectively used for indicating power supply and Bluetooth connection states.

[0017] The utility model discloses a kind of advantages as follows:

[0018] The utility model discloses a kind of including master control chip circuit, power supply circuit, voltage acquisition circuit Internet of Things voltmeter circuit, wherein voltage acquisition circuit includes ADC acquisition chip, several acquisition ports electrically connected with ADC acquisition chip, can realize the direct detection of the difference of multiple voltage, and detect tiny voltage signal. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a system schematic diagram of the utility model Internet of Things voltmeter circuit.

[0020] Figure 2 It is the master control chip schematic diagram in embodiment 2.

[0021] Figure 3 It is the filter capacitor schematic diagram in embodiment 2.

[0022] Figure 4 It is the voltage stabilizing circuit schematic diagram in embodiment 2.

[0023] Figure 5 It is the buzzer schematic diagram in embodiment 2.

[0024] Figure 6 It is the reference voltage circuit schematic diagram in embodiment 2.

[0025] Figure 7 It is the boost circuit schematic diagram in embodiment 2.

[0026] Figure 8 It is the voltage acquisition circuit schematic diagram in embodiment 2.

[0027] Figure 9 It is the reset circuit schematic diagram in embodiment 2.

[0028] Figure 10 It is the BOOT circuit schematic diagram in embodiment 2.

[0029] Figure 11is the USB power supply and lithium battery charging circuit schematic diagram in example 2.

[0030] Figure 12 is the Bluetooth communication circuit schematic diagram in example 2.

[0031] Figure 13 is the type-c power supply and communication circuit schematic diagram in example 2.

[0032] Figure 14 is the serial port burning circuit schematic diagram in example 2.

[0033] Figure 15 is the PCB arrangement schematic diagram of the utility model a kind of internet of things voltmeter circuit in example 3. DETAILED DESCRIPTION

[0034] The utility model will be described in detail in combination with the drawings and specific embodiments.

[0035] Example 1

[0036] As Figure 1 shown, a kind of internet of things voltmeter circuit, including main control chip circuit, power supply circuit, voltage acquisition circuit;The main control chip circuit includes main control chip;The voltage acquisition circuit includes ADC acquisition chip, several acquisition ports electrically connected with ADC acquisition chip;The power supply circuit is electrically connected with main control chip circuit, voltage acquisition circuit;Power supply for main control chip, ADC acquisition chip;The main control chip is also electrically connected with ADC acquisition chip.

[0037] The utility model aims at providing a kind of voltmeter circuit structure based on internet of things to solve the deficiency in prior art.This internet of things voltmeter adopts digital measurement technology, converts analog voltage signal into digital signal, and carries out data processing by microprocessor, finally data is transmitted to PC end or mobile phone end.This design not only improves the accuracy and stability of measurement, but also realizes the real-time transmission and remote monitoring of data.

[0038] Example 2

[0039] More specifically, as Figure 2 shown, in a specific embodiment, the main control chip specifically adopts STM32F103C8T6, without external crystal oscillator, two crystal oscillator pins are connected to ground through 10K ohm resistance, to improve electromagnetic compatibility.

[0040] The main control chip circuit further includes voltage stabilizing circuit, filter circuit;The input end of voltage stabilizing circuit is electrically connected with the output end of power supply circuit;The output end of voltage stabilizing circuit is electrically connected with the input end of filter circuit and main control chip respectively.

[0041] AsFigure 3 In the embodiment, the voltage stabilizing circuit stabilizes 5V voltage to 3.3V voltage through ME6211C33M5G chip; the Vin and CE ends of the ME6211C33M5G chip are connected to the 5V / 3.7V voltage output by the lithium battery; the VOUT end of the ME6211C33M5G chip outputs 3.3V voltage; and the VSS end is grounded.

[0042] As shown in Figure 4 , power is provided to the STM32F103C8T6 chip. The filter circuit uses four 100nF capacitors connected in parallel, with one end electrically connected to the output end of the voltage stabilizing circuit and the other end grounded.

[0043] As shown in Figure 5 , in one specific embodiment, a buzzer is further included; the buzzer is electrically connected to the main control chip and is used to prompt the circuit to act. In the embodiment, the buzzer is specifically a 3V active buzzer with a running frequency of 2.7KHz and is electrically connected to the PA4 port of the main control chip. The buzzer plays an indicating role when the device acts, and the buzzer rings once when the device is powered on. The buzzer rings once when the Bluetooth is connected.

[0044] In one specific embodiment, the voltage collecting circuit further includes a boost chip, a reference voltage chip, and a collection port; the input end of the boost chip is electrically connected to the output end of the power supply circuit; the output end of the boost chip is respectively electrically connected to the input end of the reference voltage chip and the corresponding input end of the ADC collection chip; the output end of the reference voltage chip is electrically connected to the corresponding input end of the ADC collection chip; and the output end of the ADC collection chip is electrically connected to a plurality of collection ports.

[0045] In the embodiment, as shown in Figure 6 , the ADC collection chip specifically uses a 24-bit ADC collection chip AD7190 to realize the collection function of the micro voltage; specifically including two collection ports; the AIN1 end and the AIN2 end of the AD7190 are respectively connected to the first collection port through the corresponding 10K ohm resistors R17 and R18 and the radio frequency coaxial connector RF1; and the AIN3 and GND ports of the AD7190 are directly connected to the second collection port through the radio frequency coaxial connector RF2.

[0046] As shown in Figure 7 , the boost chip specifically uses a 5V boost chip SX1308 to provide 5V power supply voltage for the AVDD port of the AD7190 and the reference voltage chip. The Vin and EN ends of the 5V boost chip SX1308 are connected to the 5V / 3.7V voltage output by the lithium battery; the SW end of the 5V boost chip SX1308 outputs 5V power supply voltage through the diode D2 and is connected to the Vin end through the 4.7μH inductor L1.

[0047] As shown in Figure 8 , the reference voltage chip specifically adopts a 3.3V reference voltage chip REF3033 to provide a 3.3V reference voltage for the DVDD end of the AD7190; the IN end of the REF3033 is connected to the 5V supply voltage output by the 5V boost chip SX1308, and the OUT end of the REF3033 outputs a 3.3V voltage.

[0048] In one specific embodiment, a download circuit is further included; the download circuit includes a reset circuit and a BOOT button circuit; the reset circuit includes a reset switch, and the reset switch is electrically connected to the reset port of the master control chip; the BOOT button circuit includes a BOOT switch, and the BOOT switch is electrically connected to the BOOT end of the master control chip.

[0049] In this embodiment, as shown in Figure 9 , one end of the reset switch SW1 of the reset circuit is electrically connected to the NRST end of the master control chip, one end of the 10K ohm resistor R3, and one end of the 100nF capacitor C7, respectively; the other end of the reset switch SW2 and the capacitor C7 are grounded; the other end of the resistor R3 is connected to the 3.3V voltage output by the voltage stabilizing circuit.

[0050] In this embodiment, as shown in Figure 10 , one end of the BOOT switch SW2 of the BOOT circuit is connected to the 3.3V voltage output by the voltage stabilizing circuit; the other end of the SW2 is electrically connected to the BOOT0 end of the master control chip and one end of the 10K ohm resistor R5; one end of the 10K ohm resistor R4 is electrically connected to the PB2 end of the master control chip; the other ends of the R4 and R5 are grounded.

[0051] In one specific embodiment, the power supply circuit is specifically a USB power supply and lithium battery charging circuit; when charging, a lithium battery charging chip is used to charge the lithium battery; when discharging, the lithium battery is used to supply power to the master control chip and the ADC acquisition chip.

[0052] As shown in Figure 11 , in this embodiment, the lithium battery charging chip specifically adopts a TP4056 single lithium battery linear charging chip to charge the lithium battery. The USB power supply and lithium battery charging circuit further has a power supply selection circuit Q1 including a PMOS tube and a Schottky diode in parallel; the input end of the Q1 is electrically connected to the BAT end of the lithium battery charging chip through a power switch SW3, and the output end of the power supply selection circuit is electrically connected to the master control chip and the ADC acquisition chip. In this embodiment, the BAT end is further grounded through a 100K ohm resistor R11 and a 100K ohm resistor R12; the PA1 end of the master control chip is electrically connected between the R11 and R12;

[0053] In the embodiment, the CE end of the TP4056 single lithium battery linear charging chip is electrically connected with the USB end; the CHRG end is electrically connected with the USB end in sequence through an LED2 and a 5.1K ohm resistor R9; the STDBY end is electrically connected with the USB end in sequence through an LED3 and a 5.1K ohm resistor R10; the 5V / 3.7V voltage output by the Q1 is further electrically connected with a 1K ohm resistor R13 and a LED1.

[0054] In the embodiment, when the USB is accessed, the PMOS tube of the Q1 is turned off, the device is powered by the USB and the lithium battery is charged at the same time. When the USB is not accessed, the device is directly powered by the lithium battery. When the lithium battery is not fully charged, the LED2 is always on; when the lithium battery is fully charged, the LED3 is always on. When the device is powered on, the LED1 is always on. The on-off switch SW3 controls the start-up of the device.

[0055] In one specific embodiment, it further includes a Bluetooth communication circuit; the Bluetooth communication circuit includes a Bluetooth chip; the input end of the Bluetooth chip is electrically connected with the output end of the voltage stabilizing circuit; the output end of the Bluetooth chip is electrically connected with the main control chip.

[0056] In the embodiment, as shown in Figure 12 , a ZX-D30 Bluetooth chip is specifically adopted; the P00_TX1 and P01_RX1 ends of the ZX-D30 Bluetooth chip are respectively electrically connected with the PA3 and PA2 ends of the main control chip; the VCC end is connected with a 3.3V steady voltage; the P12 end is electrically connected with a LED4 through a 1K ohm resistor R16; the Bluetooth communication circuit realizes the wireless transmission of data, the LED4 flashes when the Bluetooth is not connected, and the LED4 is always on when the Bluetooth is connected.

[0057] In one specific embodiment, it further includes a type-c power supply and communication circuit; the type-c power supply and communication circuit includes a type-c interface circuit and a serial port burning circuit; the interface chip of the type-c interface circuit; the serial port burning circuit includes a serial port burning chip; the output end of the interface chip is electrically connected with the input end of the serial port burning chip; the output end of the serial port burning chip is electrically connected with the main control chip.

[0058] In the embodiment, as shown in Figure 13 , 14As shown, the interface chip adopts a KH-TYPE-C-16P chip; the serial port burning chip adopts a CH340N serial port chip; the VBUS end of the interface chip can be connected to a USB interface; the DP2 and DN2 of the interface chip are respectively electrically connected to the UD+ and UD- ports of the serial port burning chip; the RXD and TXD ports of the serial port burning chip are respectively electrically connected to the PA9 and PA10 ends of the master control chip; the device can be powered by the 5V power supply provided by the type-c, the type-c is connected to the CH340N serial port chip, further communication between the master control chip and the PC end can be realized, and data burning can be realized through the serial port.

[0059] Embodiment 3

[0060] In this embodiment, as Figure 15 shown, a PCB board is also designed based on the structure of the Internet of Things voltmeter circuit, the Internet of Things voltmeter circuit of the utility model comprises seven parts of a master control chip, a download circuit, a type-c power supply and communication circuit, a USB power supply and lithium battery charging circuit, a buzzer circuit, a low-power Bluetooth circuit and a voltage acquisition circuit.

[0061] Among them:

[0062] The USB power supply and lithium battery charging circuit is responsible for providing charging energy for the Internet of Things voltmeter, ensuring that the device can fully prepare before voltage acquisition operation.

[0063] The voltage acquisition circuit realizes the detection of voltage, and can realize the detection of differential voltage and single-ended voltage.

[0064] The Bluetooth communication circuit realizes wireless communication of the device, and can realize wireless communication of the detection data.

[0065] The LED lamp is used to display the networking state and the charging state. Through the color change of the LED, the current networking and charging condition of the device is intuitively displayed, and a simple and intuitive user interface is provided.

[0066] The buzzer circuit realizes the emission of a startup or other prompt sound, and provides additional prompt information for the user.

[0067] The operation interface of the user is provided, so that the user can conveniently start and stop the running state of the Internet of Things voltmeter.

[0068] In summary, the utility model discloses the voltage meter of internet of things has adopted the innovative circuit structure, has introduced the advanced wireless communication method, compared with traditional technology, the voltage meter of internet of things has improved the data's collection, storage, analysis ability significantly, effectively solved the traditional voltage meter data storage, analysis difficult problem.The utility model uses high-resolution ADC acquisition chip, compared with traditional technology, the voltage meter of internet of things realizes to the detection of small voltage signal, is helpful to the research of weak signal detection.The utility model discloses through the introduction novel circuit structure, the voltage meter of internet of things can realize the detection of differential voltage and single-ended voltage, compared with traditional technology, has increased the function of differential voltage detection, can realize the more accurate detection of voltage.The optimization design of the circuit structure of the utility model makes the voltage meter of internet of things more energy saving and environmental protection in operation.Compared with the prior art, the novel circuit structure of the utility model reduces energy consumption, reduces the influence on the environment.This conforms to the pursuit of green, sustainable development of society, is beneficial to maintaining ecological balance.

[0069] Obviously, the above-mentioned embodiments of the utility model are only examples for clearly illustrating the utility model, and are not the limitation of the embodiments of the utility model. Any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model claims.

Claims

1. An Internet of Things voltmeter circuit, characterized by: The voltage acquisition circuit further comprises a boost chip and a reference voltage chip; the input end of the boost chip is electrically connected with the output end of the power supply circuit; the output end of the boost chip is respectively electrically connected with the input end of the reference voltage chip and the corresponding input end of the ADC acquisition chip; the output end of the reference voltage chip is electrically connected with the corresponding input end of the ADC acquisition chip; the output end of the ADC acquisition chip is electrically connected with the plurality of acquisition ports.

2. The IoT voltmeter circuit of claim 1, wherein: The power supply circuit is specifically a USB power supply and lithium battery charging circuit; when charging, the lithium battery charging chip is used to charge the lithium battery; when discharging, the lithium battery is used to supply power to the main control chip and the ADC acquisition chip.

3. The IoT voltmeter circuit of claim 1, wherein: The USB power supply and lithium battery charging circuit further comprises a power supply selection circuit comprising a PMOS tube and a Schottky diode in parallel; the input end of the power supply selection circuit is electrically connected with the lithium battery charging chip; the output end of the power supply selection circuit is electrically connected with the main control chip and the ADC acquisition chip.

4. The IoT voltmeter circuit of claim 3, wherein: The type-c power supply and communication circuit further comprises a type-c interface circuit and a serial port burning circuit; the type-c interface circuit comprises an interface chip; the serial port burning circuit comprises a serial port burning chip; the output end of the interface chip is electrically connected with the input end of the serial port burning chip; the output end of the serial port burning chip is electrically connected with the main control chip.

5. The IoT voltmeter circuit of claim 1, wherein: The download circuit further comprises a reset circuit and a BOOT button circuit; the reset circuit comprises a reset switch; the reset switch is electrically connected with the reset port of the main control chip; the BOOT button circuit comprises a BOOT switch; the BOOT switch is electrically connected with the BOOT end of the main control chip.

6. The IoT voltmeter circuit of claim 1, wherein: The main control chip circuit further comprises a voltage stabilizing circuit and a filter circuit; the input end of the voltage stabilizing circuit is electrically connected with the output end of the power supply circuit; the output end of the voltage stabilizing circuit is respectively electrically connected with the input end of the filter circuit and the main control chip.

7. The IoT voltmeter circuit of claim 1, wherein: The power supply circuit and the Bluetooth communication circuit are both provided with LED display circuits, which are respectively used to indicate the power supply state and the Bluetooth connection state.

8. The IoT voltmeter circuit of claim 6, wherein: The circuit further comprises a buzzer; the buzzer is electrically connected with the main control chip and is used to prompt the action of the circuit.

9. The Internet of Things voltmeter circuit of claim 7, wherein: ​ 10. The IoT voltmeter circuit of claim 1, wherein: ​

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