CN218546859U - Current and voltage acquisition device and acquisition system - Google Patents

Abstract

The utility model discloses a current and voltage acquisition device and an acquisition system. The utility model is connected with a main control module, a Hall current sensing circuit, an analog-to-digital conversion circuit and a serial port communication circuit through a power supply module, and the analog-to-digital conversion circuit is connected to the main The control module, Hall current sensing circuit and analog voltage input circuit are connected, the serial port communication circuit is connected with the main control module; the serial port communication circuit is used to connect with the host computer, the Hall current sensing circuit is used to collect external current, and the analog voltage input The circuit is used to collect external voltage. When the user needs to collect current and voltage, the user can issue a collection command through the host computer and transmit it to the main control module through the serial port communication circuit, so that the main control module controls the analog-to-digital conversion circuit to obtain the Hall current sensor. The data collected by the circuit and the analog voltage input circuit are transmitted to the host computer for display through the serial port communication circuit, realizing remote collection and improving efficiency, and can be widely used in the field of electronic circuits.

Description

A current and voltage acquisition device and acquisition system

technical field

The utility model relates to the technical field of electronic circuits, in particular to a current and voltage acquisition device and an acquisition system.

Background technique

With the development of science and technology, electronic equipment and electronic circuit technology have achieved rapid development. Electronic equipment and electronic circuits are used in various industries, and the number of electronic equipment and electronic circuits is gradually increasing. In practical applications, in order to ensure the normal operation of electronic equipment, electronic circuits, etc., users usually need to monitor, such as collecting current, voltage and other related parameters to detect whether the working status is normal or abnormal. However, when the number of electronic devices is large, the efficiency is low and the operation is cumbersome.

Utility model content

In order to solve the above technical problems, the purpose of this utility model is to provide a current and voltage acquisition device and an acquisition system.

The technical scheme that the utility model takes is:

A current and voltage acquisition device, including a power module, a main control module, an analog-to-digital conversion circuit, a Hall current sensing circuit, an analog voltage input circuit, and a serial port communication circuit; the power module and the main control module, the The Hall current sensing circuit, the analog-to-digital conversion circuit and the serial port communication circuit are connected, and the analog-to-digital conversion circuit is connected to the main control module, the Hall current sensing circuit and the analog voltage input circuit , the serial port communication circuit is connected to the main control module; the serial port communication circuit is used to connect with the upper computer, the Hall current sensing circuit is used to collect external current, and the analog voltage input circuit is used to collect external Voltage.

Further, the power module includes a first voltage regulator and a second voltage regulator, the input end of the first voltage regulator is connected to an external power supply, and the output end of the first voltage regulator is connected to the second voltage regulator input terminal of the device.

Further, the output terminal of the first voltage regulator is connected to the Hall current sensing circuit and the analog-to-digital conversion circuit, and the output terminal of the second voltage regulator is connected to the analog-to-digital conversion circuit, the main control module and the serial port communication circuit.

Further, the Hall current sensing circuit includes a Hall current sensing chip, a first capacitor, a second capacitor, a third capacitor and a first resistor, and the Hall current sensing chip has a power supply terminal, an output terminal, a filter Terminal, ground terminal and current sensing terminal for collecting external current, the power supply terminal is connected to the power module and one terminal of the first capacitor, the ground terminal and the other terminal of the first capacitor are grounded, and the filter terminal passes through the The second capacitor is grounded, the output end of the Hall current sensing chip is connected to one end of the first resistor, the other end of the first resistor is connected to one end of the third capacitor and the analog-to-digital conversion circuit, and the first resistor The other end of the three capacitors is grounded.

Further, the analog voltage input circuit includes a second resistor, a third resistor, a fourth resistor and a first diode, one end of the second resistor collects an external voltage, and the other end of the second resistor is connected to the third resistor One end, one end of the fourth resistor and the negative pole of the first diode, the other end of the third resistor is connected to the positive pole of the first diode and grounded, the other end of the fourth resistor is connected to the Analog-to-digital conversion circuit.

Further, the analog-to-digital conversion circuit includes an analog-to-digital conversion chip, and the analog-to-digital conversion chip is connected to the other end of the fourth resistor, the other end of the first resistor, and the main control module.

Further, the main control module includes a controller and an auxiliary circuit, the controller is connected to the auxiliary circuit, the power module, the analog-to-digital conversion circuit, and the serial port communication circuit; the auxiliary circuit includes a crystal oscillator circuit , reset circuit and debug download interface.

Further, the current and voltage acquisition device further includes a state indicating circuit, and the state indicating circuit is connected with the power module and the controller.

Further, the state indication circuit includes a first light emitting diode, a second light emitting diode, a third light emitting diode, a fourth light emitting diode, a fifth resistor, a sixth resistor, a seventh resistor and an eighth resistor; one end of the fifth resistor Connect the power module, one end of the sixth resistor, one end of the seventh resistor, and one end of the eighth resistor, the other end of the fifth resistor is connected to the anode of the fourth light-emitting diode, and the fourth light-emitting diode The negative pole of the sixth resistor is connected to the ground, the other end of the sixth resistor is connected to the positive pole of the first light-emitting diode, the other end of the seventh resistor is connected to the positive pole of the second light-emitting diode, and the other end of the eighth resistor is connected to the third The positive pole of the light emitting diode, the negative pole of the first light emitting diode, the negative pole of the second light emitting diode, and the negative pole of the third light emitting diode are respectively connected to different input ends of the controller.

The embodiment of the utility model also provides an acquisition system, including a host computer and the current and voltage acquisition device.

The beneficial effects of the utility model are: the power supply module is connected with the main control module, the Hall current sensing circuit, the analog-to-digital conversion circuit and the serial port communication circuit, and the analog-to-digital conversion circuit is connected with the main control module, the Hall current sensing circuit and the analog The voltage input circuit is connected, the serial port communication circuit is connected with the main control module; the serial port communication circuit is used to connect with the host computer, the Hall current sensing circuit is used to collect external current, and the analog voltage input circuit is used to collect external voltage. When the user needs to collect For current and voltage, the acquisition command can be issued by the host computer and transmitted to the main control module through the serial communication circuit, so that the main control module controls the analog-to-digital conversion circuit to obtain the data collected by the Hall current sensing circuit and the analog voltage input circuit. The control module transmits the collected data to the upper computer for display through the serial port communication circuit, realizing remote collection and monitoring, which is convenient and fast, and improves the efficiency.

Description of drawings

Fig. 1 is the block schematic diagram of the collection system of the specific embodiment of the present utility model;

Fig. 2 is the schematic diagram of the power supply module of the specific embodiment of the utility model;

Fig. 3 is the schematic diagram of the Hall current sensing circuit of the specific embodiment of the utility model;

Fig. 4 is the schematic diagram of the analog voltage input circuit of the specific embodiment of the utility model;

Fig. 5 is the schematic diagram of the analog-to-digital conversion circuit of the specific embodiment of the utility model;

Fig. 6 is the schematic diagram of the main control module of the specific embodiment of the utility model;

7 is a schematic diagram of a state indicating circuit of a specific embodiment of the present invention;

FIG. 8 is a schematic diagram of a serial port communication circuit of a specific embodiment of the present invention.

Detailed ways

In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiment of the application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the application. Obviously, the described embodiment is only It is an embodiment of a part of the application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

The terms "first", "second", "third" and the like in the specification and claims of the present application and the drawings are only used to distinguish different objects, rather than to describe a specific order. Furthermore, the terms "include" and "have", as well as any variations thereof, are intended to cover a non-exclusive inclusion. Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The occurrences of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is understood explicitly and implicitly by those skilled in the art that the embodiments described herein can be combined with other embodiments.

The utility model will be further explained and illustrated below in conjunction with the accompanying drawings and specific embodiments of the specification.

Referring to Fig. 1, the embodiment of the utility model provides a current and voltage acquisition device, including a power module, a main control module, an analog-to-digital conversion circuit, a Hall current sensing circuit, an analog voltage input circuit, a serial port communication circuit and a status indication circuit. In the embodiment of the utility model, the serial port communication circuit is used to connect with the host computer so as to realize the communication between the main control module and the host computer, the Hall current sensing circuit is used to collect external current, and the analog voltage input circuit is used to collect external voltage; The module is connected with the main control module, the Hall current sensing circuit, the analog-to-digital conversion circuit and the serial port communication circuit, the analog-to-digital conversion circuit is connected with the main control module, the Hall current sensing circuit and the analog voltage input circuit, and the serial port communication circuit is connected with the main Control module connection.

Referring to Fig. 2, in the embodiment of the utility model, the power module includes a first voltage regulator U1, a second voltage regulator U2 and a first circuit, the input end of the first voltage regulator U1 is connected to an external power supply, and the first voltage regulator U1 The output terminal of is connected to the input terminal of the second regulator U2. Optionally, the first circuit includes a power terminal P1 connected to an external power supply of +12V, a fuse F1, a diode D1, a diode D10, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, and a capacitor C8 and resistor R1. It should be noted that the output terminal of the first voltage regulator U1 is used to output a 5V power supply (VCC 5V), and the output terminal of the second voltage regulator U2 is used to output a 3V power supply (VCC 3V3); the output terminal of the first voltage regulator U1 The model includes but not limited to BD450M5WFPJ, and the model of the second regulator U2 includes but not limited to LM1117IMPX-3.3/NOPB. In the embodiment of the utility model, the output end of the first voltage regulator is connected to the Hall current sensing circuit and the analog-to-digital conversion circuit, and the output end of the second voltage regulator is connected to the analog-to-digital conversion circuit, the main control module and the serial port communication circuit.

Referring to Fig. 3, in the embodiment of the present utility model, the Hall current sensing circuit includes a Hall current sensing chip U6, a first capacitor C33, a second capacitor C32, a third capacitor C34, a first resistor R32 and a connector P6. The current sensing chip U6 has a power supply terminal (pin 8), an output terminal (pin 7), a filter terminal (pin 6), a ground terminal (pin 5), and a current sensing terminal for collecting external current. (Pins 1-4) Harvest external current through connector P6. Wherein, the power end is connected to the power module and one end of the first capacitor C33, the ground end and the other end of the first capacitor C33 are grounded, the filter end is grounded through the second capacitor C32, and the output end of the Hall current sensing chip U6 is connected to one end of the first resistor R32 , the other end of the first resistor R32 is connected to one end of the third capacitor C34 and the analog-to-digital conversion circuit, and the other end of the third capacitor C34 is grounded to GND. In the embodiment of the utility model, the current flowing through the Hall current sensing chip U6 is proportionally converted into a voltage signal, and the voltage value output by the controller can be converted to obtain the current value (the conversion method is based on the prior art level), When switching the pin-compatible Hall current sensor chip U6 with different ranges, the current input ranges of -5A to +5A, -10A to +10A, and -20A to +20A can be obtained respectively. Optionally, the model of the Hall current sensing chip U6 includes but is not limited to ACS724.

With reference to Fig. 4, in the utility model embodiment, analog voltage input circuit comprises second resistor R28, the 3rd resistor R30, the 4th resistor R50 and the first diode D6, the second resistor R28 one end collects external voltage (ANALOG IN1) The other end of the second resistor R28 is connected to one end of the third resistor R30, one end of the fourth resistor R50 and the cathode of the first diode D6, the other end of the third resistor R30 is connected to the anode of the first diode D6 and grounded to GND, the second The other end of the four resistors R50 is connected to an analog-to-digital conversion circuit. It should be noted that the external voltage and the external current may be circuits, devices or systems to be measured. Optionally, the analog voltage input circuit accepts an external -10V to +10V voltage signal input, and performs conditioning on the signal such as filtering and attenuation.

With reference to Fig. 5, in the utility model embodiment, analog-to-digital conversion circuit comprises analog-to-digital conversion chip U9 and the second circuit, analog-to-digital conversion chip and power supply module, second circuit, the other end of the fourth resistance, the other end of the first resistance and Main control module connection. Optionally, the model of the analog-to-digital conversion chip U9 includes but is not limited to AD7606; the second circuit includes capacitor C11, capacitor C41, capacitor C44, capacitor C42, capacitor C43, capacitor C45, capacitor C46, capacitor C10, resistor R73, resistor R64 . Wherein, the analog-to-digital conversion circuit converts the input analog voltage signal into a digital signal to facilitate processing by the main control module, specifically converts the input analog voltage signal into a corresponding value and stores it in an internal register for the main control module to read.

Referring to Fig. 6, in the utility model embodiment, main control module comprises controller U3 and the 3rd circuit, and the 3rd circuit comprises auxiliary circuit, and controller U3 is connected with the 3rd circuit, power module, analog-to-digital conversion circuit and serial port communication circuit . Optionally, the auxiliary circuit includes a crystal oscillator circuit, a reset circuit (not shown) and a debugging download interface. The reset circuit is connected to RST. The crystal oscillator circuit includes a crystal oscillator Y1, a capacitor C19, and a capacitor C20. The reset circuit automatically resets the The operation of system reset provides correct initial conditions for the normal operation of the system; the debugging and downloading interface provides services for the development, debugging and downloading of system application programs. Wherein, the third circuit further includes a resistor R18, a resistor R19, a resistor R13, a resistor R44, a resistor R42, a resistor R21, a resistor R43, a resistor R20, a resistor R5, and a resistor R4. Optionally, the model of the controller U3 includes but not limited to STM32F105VBT6. In the embodiment of the utility model, the controller receives the instructions issued by the host computer, analyzes the instructions and executes the corresponding tasks, analyzes, processes, packages, and outputs the read data, and outputs status or control signals, and performs current and voltage Acquisition and control of the status indication circuit, and transmit the collected data to the host computer.

Referring to Fig. 7, in the embodiment of the utility model, the state indicating circuit is connected with the power supply module and the controller, and the state indicating circuit includes a first light emitting diode D3, a second light emitting diode D4, a third light emitting diode D5, a fourth light emitting diode D2, The fifth resistor R14, the sixth resistor R15, the seventh resistor R16 and the eighth resistor R17; one end of the fifth resistor R14 is connected to the power module, one end of the sixth resistor R15, one end of the seventh resistor R16, one end of the eighth resistor R17, and the fifth resistor The other end of R14 is connected to the positive pole of the fourth light emitting diode D2, the negative pole of the fourth light emitting diode D2 is grounded, the other end of the sixth resistor R15 is connected to the positive pole of the first light emitting diode D3, and the other end of the seventh resistor R16 is connected to the positive pole of the second light emitting diode D4 , the other end of the eighth resistor R17 is connected to the anode of the third light-emitting diode D5, the cathode of the first light-emitting diode D3, the cathode of the second light-emitting diode D4, and the cathode of the third light-emitting diode D5 are respectively connected to different input terminals of the controller, specifically LED2, LED1, LED0. Exemplarily, the first light-emitting diode D3, the second light-emitting diode D4, and the third light-emitting diode D5 can use red, yellow, and green LED lights, which respectively indicate the current state of the system by being on and blinking.

Referring to Fig. 8, in the embodiment of the utility model, the serial port communication circuit has a MAX232 chip U4 and a fourth circuit. Optionally, the MAX232 chip is connected to the controller U3, and the fourth circuit includes a resistor R22, a resistor R24, a resistor R23, a resistor R25, a capacitor C25, a capacitor C27, a capacitor C23, a capacitor C24, a capacitor C26, and a capacitor C28, and is used to connect the upper Machine connector JI DB9.

The embodiment of the utility model also provides an acquisition system, including a host computer and the above-mentioned current and voltage acquisition device.

The specific working process of the acquisition system of the utility model embodiment is described below:

The system can work in two modes: 1. Command-based mode and 2. Periodic upload mode. The command-based mode can include current acquisition commands, voltage acquisition commands and system commands. The system works in command-based mode by default when it is powered on.

1) After the host computer sends the current acquisition command, the command string of RS232 level is converted to TTL level through the serial port communication circuit, and then received by the controller, the controller analyzes the command, and then controls the analog-to-digital conversion circuit to start collecting The current of the Hall current sensing circuit (one or more of the four channels of pins 1-4) corresponds to the converted voltage signal, and the output voltage of the output represents the magnitude of the collected current. Then, the analog-to-digital conversion circuit converts the collected voltage signal into 16-bit data and stores it in the internal register of the analog-to-digital conversion chip U9. When the data is ready, it sends a signal to notify the controller. The data is read from the analog-to-digital conversion circuit to the internal memory of the controller. The controller processes the read data and sends it out through its TXD. When the data is sent, the controller controls the current acquisition status LED of the status indication circuit (for example D3) lights up for 0.5 seconds and then goes off, indicating that the current acquisition command has been executed, the data sent by the controller is converted by the serial communication circuit and then reaches the host computer, and the host computer (9) displays the current data to the user, thereby realizing remote current acquisition .

2) After the host computer sends the voltage acquisition command, the command string of RS232 level is converted to TTL level through the serial port communication circuit, and then received by the controller, the controller) parses the command, and then controls the analog-to-digital conversion circuit to start Collect the external voltage signal input by the analog voltage input circuit, the analog-to-digital conversion circuit converts the collected external voltage signal into 16-bit data and store it in the internal register of the analog-to-digital conversion chip U9, when the data is ready, send a signal to notify Controller, the controller reads the data from the analog-to-digital conversion circuit to the internal memory of the controller through its SPI communication interface, the controller processes the read data and sends it out through its TXD, when the data is sent, the controller controls The voltage acquisition status LED (such as D4) of the status indication circuit is on for 0.5 seconds and then goes out, indicating that the voltage acquisition command has been executed. The data sent by the controller is converted by the serial port communication circuit and then reaches the upper computer, and the upper computer displays the voltage data to the user.

Periodic upload mode: After the upper computer issues the command to upload the current periodically, the command string of RS232 level is converted to TTL level through the serial port communication circuit, and is received by the controller. The controller parses the command and immediately controls the state The system working mode LED of the indicating circuit changes from off to on (for example, D5), indicating that the system has entered the periodic upload mode. Then the controller controls the analog-to-digital conversion circuit to start collecting the current signals of the channels of all ports of the Hall current sensing circuit. Process and pack together and send out through its TXD. When the data is sent out, the current acquisition status LED (such as D3) of the controller control status indication circuit is on for 0.5 seconds and then goes out, indicating that a cycle of current acquisition tasks has been executed. complete. The data sent by the controller (5) reaches the host computer after being converted by the serial port communication circuit, and the host computer displays the current data of all channels to the user. In the periodic current upload mode, the system working mode LED is always on (such as D2), the controller automatically collects current data every second and uploads it to the host computer, and the current collection status LED (such as D5) flickers at a frequency of 1Hz. The upper computer updates the current data every 1 second.

The above is a specific description of the preferred implementation of the utility model, but the utility model is not limited to the implementation, and those skilled in the art can also make various equivalent deformations or replacements without violating the spirit of the utility model , these equivalent modifications or replacements are all within the scope defined by the claims of the present application.

Claims (10)

1. A current and voltage acquisition device is characterized by comprising a power supply module, a main control module, an analog-to-digital conversion circuit, a Hall current sensing circuit, an analog voltage input circuit and a serial port communication circuit; the power module is connected with the main control module, the Hall current sensing circuit, the analog-to-digital conversion circuit and the serial port communication circuit, the analog-to-digital conversion circuit is connected with the main control module, the Hall current sensing circuit and the analog voltage input circuit, and the serial port communication circuit is connected with the main control module; the serial port communication circuit is used for being connected with an upper computer, the Hall current sensing circuit is used for collecting external current, and the analog voltage input circuit is used for collecting external voltage.

2. The current and voltage acquisition device according to claim 1, wherein: the power module comprises a first voltage stabilizer and a second voltage stabilizer, wherein the input end of the first voltage stabilizer is connected with an external power supply, and the output end of the first voltage stabilizer is connected with the input end of the second voltage stabilizer.

3. The current and voltage acquisition device according to claim 2, wherein: the output end of the first voltage stabilizer is connected with the Hall current sensing circuit and the analog-to-digital conversion circuit, and the output end of the second voltage stabilizer is connected with the analog-to-digital conversion circuit, the main control module and the serial port communication circuit.

4. A current and voltage acquisition device according to any one of claims 1-3, characterized in that: the Hall current sensing circuit comprises a Hall current sensing chip, a first capacitor, a second capacitor, a third capacitor and a first resistor, wherein the Hall current sensing chip is provided with a power supply end, an output end, a filtering end, a grounding end and a current sensing end for collecting external current, the power supply end is connected with the power supply module and one end of the first capacitor, the grounding end and the other end of the first capacitor are grounded, the filtering end is grounded through the second capacitor, the output end of the Hall current sensing chip is connected with one end of the first resistor, the other end of the first resistor is connected with one end of the third capacitor and the analog-to-digital conversion circuit, and the other end of the third capacitor is grounded.

5. The current and voltage acquisition device according to claim 4, wherein: the analog voltage input circuit comprises a second resistor, a third resistor, a fourth resistor and a first diode, wherein external voltage is collected at one end of the second resistor, the other end of the second resistor is connected with one end of the third resistor, one end of the fourth resistor and the negative electrode of the first diode, the other end of the third resistor is connected with the positive electrode of the first diode and is grounded, and the other end of the fourth resistor is connected with the analog-to-digital conversion circuit.

6. The current and voltage acquisition device according to claim 5, wherein: the analog-to-digital conversion circuit comprises an analog-to-digital conversion chip, and the analog-to-digital conversion chip is connected with the other end of the fourth resistor, the other end of the first resistor and the main control module.

7. A current and voltage acquisition device according to any one of claims 1-3, characterized in that: the main control module comprises a controller and an auxiliary circuit, and the controller is connected with the auxiliary circuit, the power supply module, the analog-to-digital conversion circuit and the serial port communication circuit; the auxiliary circuit comprises a crystal oscillator circuit, a reset circuit and a debugging and downloading interface.

8. The current and voltage acquisition device according to claim 7, wherein: the current and voltage acquisition device further comprises a state indicating circuit, and the state indicating circuit is connected with the power module and the controller.

9. The current and voltage acquisition device according to claim 8, wherein: the state indicating circuit comprises a first light emitting diode, a second light emitting diode, a third light emitting diode, a fourth light emitting diode, a fifth resistor, a sixth resistor, a seventh resistor and an eighth resistor; the LED light source comprises a power module, a sixth resistor, a seventh resistor and an eighth resistor, wherein one end of the fifth resistor is connected with one end of the sixth resistor, one end of the eighth resistor is connected with the other end of the fifth resistor, the other end of the fifth resistor is connected with the anode of a fourth light emitting diode, the cathode of the fourth light emitting diode is grounded, the other end of the sixth resistor is connected with the anode of a first light emitting diode, the other end of the seventh resistor is connected with the anode of a second light emitting diode, the other end of the eighth resistor is connected with the anode of a third light emitting diode, and the cathode of the first light emitting diode, the cathode of the second light emitting diode and the cathode of the third light emitting diode are respectively connected with different input ends of the controller.

10. An acquisition system comprising an upper computer and a current and voltage acquisition device according to any one of claims 1 to 9.

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