CN216847917U - Novel digital voltage current collector for direct current control cabinet - Google Patents
Novel digital voltage current collector for direct current control cabinet Download PDFInfo
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- CN216847917U CN216847917U CN202123138713.9U CN202123138713U CN216847917U CN 216847917 U CN216847917 U CN 216847917U CN 202123138713 U CN202123138713 U CN 202123138713U CN 216847917 U CN216847917 U CN 216847917U
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- 238000002955 isolation Methods 0.000 claims abstract description 22
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 22
- 238000010586 diagram Methods 0.000 description 5
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- 102220640101 MAL-like protein_W25Q_mutation Human genes 0.000 description 1
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Abstract
The utility model relates to a novel digital voltage electric current collection appearance for direct current switch board, a serial communication port, including main control chip, analog input module, power module, analog output module, digital output module, display module and storage module, wherein: the master control chip collects a voltage signal and a current signal through an analog input module, wherein the analog input module comprises a high-resistance isolation resistor for accessing a voltage sampling signal and a sampling resistor for sampling current; the high-resistance isolation resistor is connected with the input end of the first differential amplification circuit, and the output end of the first differential amplification circuit is connected with the analog input end of the main control chip through the clamp protection circuit; the sampling resistor is connected to the input end of the isolation operational amplifier, the output end of the isolation operational amplifier is connected with the input end of the second differential amplification circuit, and the output end of the second differential amplification circuit is connected with the analog input end of the main control chip through the second clamping protection circuit. The utility model discloses circuit structure is simple, and sampling linearity is good.
Description
Technical Field
The utility model relates to a digital voltage current acquisition instrument belongs to electron technical field.
Background
At present, the principle of current sampling mainly includes sampling of electric signals through a shunt resistor and sampling of magnetic signals by using a hall sensor, wherein the direct acquisition of electric signals is the simplest and most common way. However, to directly detect the electrical signal, electrical isolation must be performed between the strong current side and the control side, otherwise, a strong current loop may cause danger when connected in series with a weak current.
At present, most of means for transmitting signals with electrical isolation adopt a linear optocoupler, and the opening degree of a phototriode is controlled by changing the brightness of a light emitting diode so as to transmit and amplify the signals. However, doing so has the following problems: 1) the response speed of the optical coupler is not fast enough; 2) the precision of the optical coupler is not high enough; 3) the peripheral circuit of the optical coupler is complex, and the factors such as the starting voltage and the linearity of the photoelectric tube need to be considered
Disclosure of Invention
The to-be-solved technical problem of the utility model is: when directly collecting electric signals, a linear optocoupler is adopted as an electric isolation means between a strong current side and a control side.
In order to solve the technical problem, the utility model provides a novel digital voltage electric current collection appearance for direct current switch board is provided, a serial communication port, including main control chip, analog input module, power module, analog output module, digital output module, display module and storage module, wherein:
the power supply module supplies power to the main control chip, the analog input module, the analog output module, the digital output module, the display module and the storage module;
the master control chip collects a voltage signal and a current signal through an analog input module, wherein the analog input module comprises a high-resistance isolation resistor for accessing a voltage sampling signal and a sampling resistor for sampling current; the high-resistance isolation resistor is connected with the input end of the first differential amplification circuit, and the output end of the first differential amplification circuit is connected with the analog input end of the main control chip through the clamp protection circuit; the sampling resistor is connected to the input end of the isolation operational amplifier, the output end of the isolation operational amplifier is connected with the input end of the differential amplification circuit II, and the output end of the differential amplification circuit II is connected with the analog quantity input end of the main control chip through the clamping protection circuit II;
the main control chip controls a relay in the direct current control cabinet through the digital quantity output module;
the main control chip is also connected with the digital quantity output module, the display module and the storage module.
Preferably, the isolation operational amplifier adopts an AMC1200 chip, pins 2 and 3 of the AMC1200 chip are connected to a current limiting resistor, the current limiting resistor is connected across two ends of the sampling resistor, pins 1 and 4 of the AMC1200 chip are connected to an isolation power supply, pins 5 and 8 of the AMC1200 chip are grounded after being connected to the power supply module and then are connected to the power supply module connected to the main control chip, and pins 6 and 7 of the AMC1200 chip are connected to an input terminal of the second differential amplifier circuit.
Preferably, the analog output module comprises an RC filter circuit, an input end of the RC filter circuit is connected to a PWM waveform output end of the main control chip, and an output end of the RC filter circuit forms analog output via the transmitter circuit.
Preferably, the power module comprises a protection circuit, the 220V power is connected to the AC/DC unit through the protection circuit, the output end of the AC/DC unit is connected with the first DC/DC unit and the second DC/DC unit, the first DC/DC unit converts the 5V output by the AC/DC unit into +/-12V, and the second DC/DC unit converts the 5V output by the AC/DC unit into 3.3V;
the AC/DC unit supplies power to the display module and the relay;
the DC/DC unit I supplies power to the differential amplification circuit I, the differential amplification circuit II and the transmitter circuit;
and the DC/DC unit II is used for supplying power to the main control chip, the AMC1200 chip and the storage module.
Preferably, the digital output module comprises a darlington tube, an input end of the darlington tube is connected with an IO port of the main control chip, and an output end of the darlington tube is connected with the relay.
Preferably, the main control chip is connected to the display module and the storage module via an SPI bus.
Compared with the prior art, the utility model discloses circuit structure is simple, and sampling linearity is good. Simple installation, multi-channel parameter display and intuitive operation and setting modes.
Drawings
Fig. 1 is a circuit block diagram of a power module according to the present invention;
fig. 2 is a circuit block diagram of the analog input module of the present invention;
FIG. 3 is a circuit block diagram of an analog output module of the present invention
Fig. 4 is a circuit block diagram of the digital output module according to the present invention;
fig. 5 is a circuit block diagram of the display module and the memory module of the present invention.
Detailed Description
The present invention will be further described with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes and modifications of the present invention may be made by those skilled in the art after reading the teachings of the present invention, and these equivalents also fall within the scope of the appended claims.
The utility model discloses a novel digital voltage electric current collection appearance voltage for direct current switch board has functions such as current display, parameter display and setting, incident trigger and record and curve display, including main control chip, analog input module, power module, analog output module, digital output module, display module and storage module.
In this embodiment, the main control chip is a domestic single chip microcomputer huada HC32F030J8 TA.
The display module uses a font chip as an LCD12864 screen of ST7920, 4 groups of data can be displayed simultaneously on one page, and the main control chip sends data to the LCD12864 screen through the SPI bus.
The storage module uses chip W25Q64, and memory capacity is 64M, links to each other with the main control chip through the SPI bus, sets up 10W incident records.
As shown in fig. 2, the main control chip implements voltage sampling and current sampling through the analog input module, wherein:
when the main control chip carries out voltage sampling through the analog quantity input module, the positive electrode and the negative electrode of input voltage are respectively subjected to high isolation through a resistor of 5M omega, then the input voltage is input into a first differential amplification circuit formed based on an lm258 operational amplifier, the voltage to be measured is reduced by 100 times in an equal ratio through the first differential amplification circuit, and then the voltage to be measured is sent to the analog quantity input end of the main control chip through a first clamping protection circuit. In this embodiment, the first clamp protection circuit employs a clamp diode.
When the main control chip carries out current sampling through the analog quantity input module, the sampling resistor uses the current divider as required to convert the current into a voltage analog quantity of 0-75 mV. And an AMC1200 isolation operational amplifier chip is used, a differential amplification circuit II formed by an lm 258-based operational amplifier is connected in series at the rear stage of the AMC1200 isolation operational amplifier chip for differential amplification, and then the amplified differential amplification circuit II is sent to a main control chip for subsequent calculation through a clamping protection circuit II.
In this embodiment, the isolation operational amplifier uses an AMC1200 chip, the 2 nd and 3 rd pins of the AMC1200 chip are connected to a current limiting resistor, the current limiting resistor is connected across two ends of the sampling resistor, the 1 st and 4 th pins of the AMC1200 chip are connected to an isolation power supply, the 5 th and 8 th pins of the AMC1200 chip are grounded after being connected to the power supply module and then connected to the power supply module of the main control chip, and the 6 th and 7 th pins of the AMC1200 chip are connected to the input end of the second differential amplifier circuit. The AMC1200 isolates the operational amplifier chip for sampling, the chip can output differential output with 0-2V voltage on the input side of 0-250mV, and the two sides are electrically isolated.
The analog quantity output module can output 2-path milliampere quantity of 4-20mA, which represents the percentage of the current voltage and current. The main control chip is used for sending out PWM waveforms, the PWM waveforms are converted into stable direct-current voltage through the RC filter circuit, the stable direct-current voltage is input into a transmitter circuit built by an lm258 operational amplifier, and 0.4-2V can be converted into 4-20mA current.
The digital quantity output module can output digital signals to the 4-path relay trunk node. Switching signals are output through an IO end of the main control chip, and the switching signals are input into the ULN2003 Darlington tube for power amplification, and corresponding relays are driven to act. The external circuit is connected with the relay dry contact, and the signal represented by the relay can be set according to the requirement.
The power module comprises a protection circuit, a 220V power supply is connected into the AC/DC unit through the protection circuit, the output end of the AC/DC unit is connected with the DC/DC unit I and the DC/DC unit II, the DC/DC unit I converts 5V output by the AC/DC unit into +/-12V, and the DC/DC unit II converts 5V output by the AC/DC unit into 3.3V;
the AC/DC unit supplies power to an LCD12864 screen and a relay;
the DC/DC unit I supplies power to all lm258 operational amplifiers;
and the DC/DC unit II is used for supplying power to the main control chip, the AMC1200 chip and the chip W25Q 64.
Claims (6)
1. The utility model provides a novel digital voltage electric current collection appearance for direct current switch board, its characterized in that, includes main control chip, analog input module, power module, analog output module, digital output module, display module and storage module, wherein:
the power supply module supplies power to the main control chip, the analog input module, the analog output module, the digital output module, the display module and the storage module;
the master control chip collects a voltage signal and a current signal through an analog input module, wherein the analog input module comprises a high-resistance isolation resistor for accessing a voltage sampling signal and a sampling resistor for sampling current; the high-resistance isolation resistor is connected with the input end of the first differential amplification circuit, and the output end of the first differential amplification circuit is connected with the analog input end of the main control chip through the clamp protection circuit; the sampling resistor is connected to the input end of the isolation operational amplifier, the output end of the isolation operational amplifier is connected with the input end of the differential amplification circuit II, and the output end of the differential amplification circuit II is connected with the analog quantity input end of the main control chip through the clamping protection circuit II;
the main control chip controls a relay in the direct current control cabinet through the digital quantity output module;
the main control chip is also connected with the digital quantity output module, the display module and the storage module.
2. The digital voltage and current collector for DC control cabinet as claimed in claim 1, wherein the isolating operational amplifier uses AMC1200 chip, the 2 nd and 3 rd pins of AMC1200 chip are connected with current limiting resistor, the current limiting resistor is connected across the two ends of the sampling resistor, the 1 st and 4 th pins of AMC1200 chip are connected with isolating power supply, the 5 th and 8 th pins of AMC1200 chip are connected with the power supply module and then are connected with the power supply module of the main control chip, the 6 th and 7 th pins of AMC1200 chip are connected with the input end of the second differential amplifier circuit.
3. The novel digital voltage current collector for the direct current control cabinet according to claim 2, wherein the analog output module comprises an RC filter circuit, an input end of the RC filter circuit is connected with the PWM waveform output end of the main control chip, and an output end of the RC filter circuit forms analog output through the transmitter circuit.
4. The novel digital voltage current collector for the direct current control cabinet as claimed in claim 3, wherein the power module comprises a protection circuit, a 220V power supply is connected to the AC/DC unit through the protection circuit, the output end of the AC/DC unit is connected to the first DC/DC unit and the second DC/DC unit, the first DC/DC unit converts 5V output by the AC/DC unit into +/-12V, and the second DC/DC unit converts 5V output by the AC/DC unit into 3.3V;
the AC/DC unit supplies power to the display module and the relay;
the DC/DC unit I supplies power to the differential amplification circuit I, the differential amplification circuit II and the transmitter circuit;
and the DC/DC unit II is used for supplying power to the main control chip, the AMC1200 chip and the storage module.
5. The novel digital voltage current collector for the direct current control cabinet as claimed in claim 1, wherein the digital quantity output module comprises a darlington tube, an input end of the darlington tube is connected with an IO port of the main control chip, and an output end of the darlington tube is connected with the relay.
6. The novel digital voltage current collector for the direct current control cabinet as claimed in claim 1, wherein the main control chip is connected to the display module and the storage module via an SPI bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123138713.9U CN216847917U (en) | 2021-12-14 | 2021-12-14 | Novel digital voltage current collector for direct current control cabinet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123138713.9U CN216847917U (en) | 2021-12-14 | 2021-12-14 | Novel digital voltage current collector for direct current control cabinet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216847917U true CN216847917U (en) | 2022-06-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123138713.9U Expired - Fee Related CN216847917U (en) | 2021-12-14 | 2021-12-14 | Novel digital voltage current collector for direct current control cabinet |
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| Country | Link |
|---|---|
| CN (1) | CN216847917U (en) |
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2021
- 2021-12-14 CN CN202123138713.9U patent/CN216847917U/en not_active Expired - Fee Related
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