CN213750077U - Constant current source current digital sampling device - Google Patents
Constant current source current digital sampling device Download PDFInfo
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- CN213750077U CN213750077U CN202023021687.7U CN202023021687U CN213750077U CN 213750077 U CN213750077 U CN 213750077U CN 202023021687 U CN202023021687 U CN 202023021687U CN 213750077 U CN213750077 U CN 213750077U
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Abstract
A constant current source current digital sampling device belongs to the field of digital voltage and current sampling analysis, and aims to realize the multichannel constant current output expansion function, provide a real-time voltage and current measurement result display function, realize the real-time transmission of data, and simultaneously support the custom setting of frequency and duty ratio current control. The output end of the power input module is connected with a current source generating circuit, and the current source generating circuit is connected with the signal isolation circuit and the frequency duty ratio control circuit; the USB interface circuit, the voltage and current sampling circuit, the EEPROM and the clock generating circuit are respectively connected with the MCU control unit. The utility model discloses compatible general interface can provide the electric current of more passageways and produce signal and current-voltage sampling signal to can carry out data acquisition and control to a plurality of external equipment simultaneously.
Description
Technical Field
The utility model belongs to test and sampling field, more specifically say, relate to a constant current source current digital sampling device.
Background
With the continuous development and upgrading of computers, mobile phones and portable intelligent equipment, a large number of constant current source devices are available in the market, most small-signal constant current source devices can provide 4-20mA current, most current constant current source devices in the market adopt a constant current source which is generated by a single chip microcomputer generating PWM waveforms and filtering through a low-pass filter network, the constant current source can perform functions such as calibration after setting and the like, but because the number of PWM channels of a common single chip microcomputer is limited, the generation of the constant current source cannot support the output of more than 8 channels generally, and the common constant current source devices cannot acquire and measure data in real time and feed back the data to users quickly. For constant current source products, generally, constant current stable output for a load cannot provide customer specific requirements.
SUMMERY OF THE UTILITY MODEL
The utility model provides a support to carry out the multichannel device of real-time measurement and adjustment to electric current and voltage, the device can realize multichannel constant current output extended functionality, provides real-time voltage current measurement, real-time data transmission, supports the customer and sets for frequency and duty ratio current control. In order to achieve the above object, the present invention provides the following technical solutions: the utility model provides a constant current source current digital sampling device, including MCU the control unit, current source generating circuit, USB interface circuit, signal isolation circuit, frequency duty cycle control circuit, power input module, voltage current sampling circuit, EEPROM, clock generation circuit, power input module output is connected with current source generating circuit, current source generating circuit is connected with signal isolation circuit and frequency duty cycle control circuit, current source generating circuit, frequency duty cycle control circuit, USB interface circuit, voltage current sampling circuit, EEPROM and clock generation circuit are connected with MCU the control unit respectively.
Furthermore, the voltage and current sampling circuit comprises an interface ESD protection circuit, a signal filter circuit, a voltage sampling circuit, a current sampling circuit, wherein the voltage sampling circuit is connected with the current sampling circuit, the connection circuit of the voltage sampling circuit and the current sampling circuit and the interface ESD protection circuit are respectively connected with the signal filter circuit, and the signal filter circuit is connected with the MCU control unit through an I2C bus.
Furthermore, the voltage and current sampling circuit is a circuit supporting 32 channels to perform sampling simultaneously, each group of I2C buses are connected with 16 voltage sampling circuits and current sampling circuits, communication is performed by allocating different addresses and the MCU control unit, and the acquired data are transmitted to the MCU control unit in real time.
Furthermore, the EEPROM is connected with the PE10 and PE11 ports in the MCU control unit, and the clock generation circuit is connected with the OSC1/OSC2 ports in the MCU control unit.
Furthermore, the current source generating circuit comprises an analog voltage generating circuit, a current generating circuit, a signal filtering circuit and a current setting control circuit, wherein the analog voltage generating circuit is connected with the current generating circuit, the signal filtering circuit is connected with the output end of the current generating circuit, the current setting control circuit is connected with the input end of the current generating circuit, and the current setting control circuit is connected with the MCU control unit.
Furthermore, the frequency duty ratio control circuit comprises a duty ratio signal generating circuit and a duty ratio signal control circuit, the MCU control unit is connected with the duty ratio signal generating circuit, the duty ratio signal generating circuit is connected with the duty ratio signal control circuit, and the duty ratio signal control circuit is connected with a control signal isolating circuit of the signal isolating circuit.
Has the advantages that: the utility model discloses compatible general interface can provide the electric current production signal and the current-voltage sampling signal of more passageways to can carry out data acquisition and control to a plurality of external equipment simultaneously, can also provide general output interface and be connected with the computer, be convenient for show test and collection. The utility model discloses also can provide and cascade the interface and connect to realize stronger commonality, and have characteristics such as small, portable, the function is various.
Drawings
Fig. 1 is a schematic block diagram of the present invention.
Fig. 2 is a schematic block diagram of a voltage and current sampling unit according to the present invention.
Fig. 3 is a schematic block diagram of the current source generating circuit, signal isolation control circuit and frequency duty cycle control circuit of the present invention.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
Example 1: as shown in fig. 1, a digital USB interface expanding and testing apparatus includes an MCU control unit, a current source generating circuit, a USB interface circuit, a signal isolating circuit, a frequency duty ratio control circuit, a power input module, a voltage and current sampling circuit, an EEPROM, and a clock generating circuit. The output end of the power input module is connected with the current source generating circuit and used for providing enough power input for the generation of the current source and supporting the 32-channel 4-20mA current source generating circuit. The current source generating circuit is connected with the signal isolation circuit and the frequency duty ratio control circuit, the signal isolation circuit can effectively isolate the control circuit from current output, the control circuit can be protected from being damaged, the frequency duty ratio control circuit can provide a current source with certain frequency and period for a load, and the circuit with flexible output can bring great convenience to a user. The current source generating circuit, the frequency duty ratio control circuit, the USB interface circuit, the voltage and current sampling circuit, the EEPROM and the clock generating circuit are respectively connected with the MCU control unit.
As shown in fig. 2, the voltage and current sampling circuit includes an interface ESD protection circuit, a signal filter circuit, a voltage sampling circuit, a current sampling circuit, a voltage sampling circuit connected to the current sampling circuit, a connection circuit of the voltage sampling circuit and the current sampling circuit, and an interface ESD protection circuit connected to the signal filter circuit, the signal filter circuit passing through I2The C bus is connected with the MCU control unit.
The interface ESD protection circuit and the signal filtering circuitThe way is connected, can provide abundant protection to sampling circuit, guarantees that the circuit is not destroyed when receiving the static voltage impact, and simultaneously, filter circuit can provide smooth voltage signal and make the sampling more accurate, can filter the unnecessary clutter. The voltage sampling circuit is connected with the current sampling circuit, and the voltage signal and the current signal are respectively sampled, so that the independence and timeliness of the voltage signal and the current signal can be ensured. The voltage sampling circuit and the current sampling circuit pass through I2The C bus is connected with the MCU control unit, and each group I2The C bus can be connected with 16 voltage sampling circuits and current sampling circuits, and communicates with the MCU by allocating different addresses, and transmits acquired data to the MCU for analysis in real time.
As shown in fig. 3, the current source generating circuit includes an analog voltage generating circuit, a current generating circuit, a signal filtering circuit, and a current setting control circuit, the analog voltage generating circuit is connected to the current generating circuit, the signal filtering circuit is connected to the output terminal of the current generating circuit, the current setting control circuit is connected to the input terminal of the current generating circuit, and the current setting control circuit is connected to the MCU control unit.
The frequency duty ratio control circuit comprises a duty ratio signal generating circuit and a duty ratio signal control circuit, the MCU control unit is connected with the duty ratio signal generating circuit, the duty ratio signal generating circuit is connected with the duty ratio signal control circuit, and the duty ratio signal control circuit is connected with a control signal isolating circuit of the signal isolating circuit.
The analog voltage generating circuit is connected with the current source generating circuit, can generate analog voltage required by the current source generating circuit and is isolated from a digital control circuit in the system to protect important devices such as an MCU unit and the like; the current setting control circuit is connected with the current source generating circuit, the other end of the current setting control circuit is connected with the MCU control unit, the current setting control circuit can receive a current setting signal given by the MCU control unit to set a current value, the signal is sent to the current source generating circuit, the current source generating circuit generates constant current according to the set value, and the current output can be controlled according to the set valueThe MCU control unit is used for providing instructions to carry out conversion, and a user sets the instructions through a computer or an operation interface; the duty ratio signal generating circuit is connected with the communication circuit and then connected with the MCU control unit, and the MCU control unit can be connected with the communication circuit through I2The C communication circuit is connected with the duty ratio signal generating circuit and can control the on-off of the output signal of the current source so as to control the output of the current source. The duty ratio signal control circuit is connected with the control signal isolation circuit, meanwhile, the duty ratio signal control circuit is connected with the duty ratio signal generation circuit, better protection can be provided for digital signal circuits such as an MCU (microprogrammed control unit) control unit through the duty ratio signal control circuit connected with the isolation signal, and meanwhile, the real-time performance of control signal transmission can be guaranteed by adopting a high-speed isolation device.
The utility model discloses compatible general interface can provide the electric current of more passageways and produce signal and current-voltage sampling signal to can carry out data acquisition and control to a plurality of external equipment simultaneously. The utility model discloses still provide general output interface and be connected with the computer, be convenient for show test and collection. The utility model discloses also can provide and cascade the interface and connect to realize stronger commonality, and have characteristics such as small, portable, the function is various.
The above description is only for the purpose of creating a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution and the inventive concept of the present invention within the technical scope of the present invention.
Claims (6)
1. The utility model provides a constant current source current digital sampling device, its characterized in that, including MCU the control unit, current source generating circuit, USB interface circuit, signal isolation circuit, frequency duty ratio control circuit, power input module, voltage current sampling circuit, EEPROM, clock generation circuit, power input module output is connected with current source generating circuit, current source generating circuit is connected with signal isolation circuit and frequency duty ratio control circuit, current source generating circuit, frequency duty ratio control circuit, USB interface circuit, voltage current sampling circuit, EEPROM and clock generation circuit are connected with MCU the control unit respectively.
2. The constant current source current digital sampling device according to claim 1, wherein the voltage and current sampling circuit comprises an interface ESD protection circuit, a signal filter circuit, a voltage sampling circuit, a current sampling circuit, a voltage sampling circuit and a current sampling circuit, wherein the voltage sampling circuit and the current sampling circuit are connected, the voltage sampling circuit and the current sampling circuit are respectively connected with the signal filter circuit, and the signal filter circuit is connected with the signal filter circuit through an I-bridge2The C bus is connected with the MCU control unit.
3. The constant current source current digital sampling device of claim 2, wherein the voltage current sampling circuit is a circuit supporting 32 channels of simultaneous sampling, each group I2The C bus is connected with the 16 voltage sampling circuits and the current sampling circuits, and communicates with the MCU control unit by allocating different addresses, and transmits acquired data to the MCU control unit in real time.
4. The constant current source current digital sampling device of claim 1, wherein the EEPROM is connected to the PE10 and PE11 ports in the MCU control unit, and the clock generation circuit is connected to the OSC1/OSC2 ports in the MCU control unit.
5. The digital sampling device for current of constant current source according to claim 1, wherein the current source generating circuit comprises an analog voltage generating circuit, a current generating circuit, a signal filtering circuit, and a current setting control circuit, the analog voltage generating circuit is connected with the current generating circuit, the signal filtering circuit is connected with the output terminal of the current generating circuit, the current setting control circuit is connected with the input terminal of the current generating circuit, and the current setting control circuit is connected with the MCU control unit.
6. The digital sampling device for constant current source current according to claim 1, wherein the frequency duty cycle control circuit comprises a duty cycle signal generating circuit and a duty cycle signal control circuit, the MCU control unit is connected to the duty cycle signal generating circuit, the duty cycle signal generating circuit is connected to the duty cycle signal control circuit, and the duty cycle signal control circuit is connected to the control signal isolating circuit of the signal isolating circuit.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2020222594135 | 2020-10-12 | ||
| CN202022259413 | 2020-10-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213750077U true CN213750077U (en) | 2021-07-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023021687.7U Active CN213750077U (en) | 2020-10-12 | 2020-12-15 | Constant current source current digital sampling device |
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| Country | Link |
|---|---|
| CN (1) | CN213750077U (en) |
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2020
- 2020-12-15 CN CN202023021687.7U patent/CN213750077U/en active Active
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