CN110568252A - four-channel double-gear interface control circuit current detection system - Google Patents
four-channel double-gear interface control circuit current detection system Download PDFInfo
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- CN110568252A CN110568252A CN201910806775.0A CN201910806775A CN110568252A CN 110568252 A CN110568252 A CN 110568252A CN 201910806775 A CN201910806775 A CN 201910806775A CN 110568252 A CN110568252 A CN 110568252A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
Abstract
the invention discloses a four-channel double-gear interface control circuit detection current system, which comprises four control circuit detection current modules, wherein each control circuit detection current module comprises a signal input module, a conversion module, a power supply module, a digital isolation and reverser combination module, a single chip microcomputer, a CPU (central processing unit), and a signal input module for acquiring an external current signal; the conversion module is used for carrying out differential amplification processing and voltage acquisition processing on the external current signal; the singlechip is used for writing an instruction for reading the first preset current range channel data into the conversion module, carrying out judgment again according to the calculated current value, and if the calculated current value is greater than or equal to the threshold value, the read sampling value is an actual test value; if the calculated current value is smaller than the threshold value, the instruction for reading the second preset current range channel data is rewritten, the collected current is automatically identified according to the fact that the sampling value read by the second preset current range is the actual test value, and manual gear shifting is avoided.
Description
Technical Field
the invention relates to the technical field of single-chip microcomputers, in particular to a four-channel double-gear interface control circuit current detection system.
background
most of instruments on the market today are for single-gear single-channel measurement of current, and when measuring currents of different ranges in an actual complex environment, the range of current testing needs to be manually converted, which is far from better experience and convenience for users.
disclosure of Invention
The invention aims to provide a four-channel double-gear interface control circuit current detection system, and aims to solve the problem that the current measurement with different ranges needs to be manually converted, so that better experience and convenience can not be brought to users.
In order to achieve the above object, the present invention provides a four-channel dual-gear interface control circuit current detection system, comprising four control circuit current detection modules, wherein each control circuit current detection module comprises a signal input module, a conversion module, a power supply module, a combined module of digital isolation and phase inverter, a single chip microcomputer and a CPU, the conversion module is electrically connected with the input module, the power supply module is electrically connected with the conversion module, the single chip microcomputer is electrically connected with the conversion module, and the CPU is carried on the single chip microcomputer,
The signal input module is used for acquiring an external current signal;
The conversion module is used for carrying out differential amplification processing and voltage acquisition processing on an external current signal;
the power supply module is used for supplying power to the conversion module;
The combined module of the digital isolation and the phase inverter ensures that the detection circuit is completely isolated from the master control circuit physically, and ensures normal communication of data.
The single chip microcomputer is used for writing an instruction for reading first preset current range channel data into the conversion module, carrying out judgment again according to the calculated current value, and if the calculated current value is larger than or equal to the threshold value, the read sampling value is an actual test value; and if the calculated current value is smaller than the threshold value, rewriting an instruction for reading second preset current range channel data, and automatically identifying the magnitude of the acquired current according to the fact that the sampling value read by the second preset current range is an actual test value.
in one embodiment, the conversion module includes a sampling resistor, two amplifiers and a voltage acquisition unit, the sampling resistor is connected in series with the signal input module, the two amplifiers are respectively electrically connected with the sampling resistor, and the voltage acquisition unit is electrically connected with the two amplifiers; wherein the content of the first and second substances,
the amplifier is used for receiving the corresponding path of input signals and performing differential amplification processing of different multiples on the input signals;
And the voltage acquisition unit is used for simultaneously acquiring the voltages of the two paths of input signals and outputting the voltages to the singlechip for calculation.
In one embodiment, the voltage acquisition unit includes two analog-to-digital converters and a chip register, each analog-to-digital converter is electrically connected to each amplifier, and the chip register is electrically connected to the CPU; wherein the content of the first and second substances,
the analog-to-digital converter is used for simultaneously converting the continuously changed analog signals of the two paths of input signals into discrete digital signals;
And the chip register is used for receiving the instruction written by the CPU for reading the current range channel data.
in one embodiment, the power supply module includes an external power source, a power isolation chip, a first voltage conversion circuit and a second voltage conversion circuit, the power isolation chip is electrically connected to the external power source, the first voltage conversion circuit is electrically connected to the two amplifiers and the power isolation chip, and the second voltage conversion circuit is electrically connected to the two amplifiers and the power isolation chip; wherein the content of the first and second substances,
The external power supply is used for supplying power to the bipolar power supply and outputting positive and negative preset voltages;
the power supply isolation chip is used for isolating the current measurement and control circuit from the main control circuit;
The first voltage conversion circuit is used for converting and outputting a preset large-current conversion voltage;
And the second voltage conversion circuit is used for converting and outputting a preset low-current conversion voltage.
In an embodiment, the conversion module further includes two digital isolation chips, two first serial communication interfaces and two second serial communication interfaces, the digital isolation chips respectively perform data communication with the voltage acquisition unit through the two first serial communication interfaces, and the digital isolation chips respectively perform data communication with the single chip microcomputer through the two second serial communication interfaces; wherein the content of the first and second substances,
the digital isolation chip is used for realizing the isolation of the voltage measurement and control circuit and the main control circuit;
and the first serial communication interface and the second serial communication interface are used for controlling high-low level conversion of pins according to the CPU instruction so as to realize data communication transmission.
in one embodiment, the conversion module further includes an inverter and a third serial communication interface, the inverter is electrically connected to the two second serial communication interfaces, and performs data communication with the single chip microcomputer through the third serial communication interface;
The phase inverter is used for matching with a chip selection signal in the CPU, and the chip selection signal controls two digital isolation MISO enabling pins and a chip selection pin to enable the first serial communication interface, the second serial communication interface and the third serial communication interface to communicate orderly.
According to the four-channel double-gear interface control circuit current detection system, differential amplification processing and voltage acquisition processing are carried out on an external current signal through the conversion module, the external current signal is transmitted to the single chip microcomputer, the single chip microcomputer writes an instruction for reading first preset current range channel data into the conversion module, judgment is carried out again according to the calculated current value, and if the calculated current value is larger than or equal to the threshold value, the read sampling value is an actual test value; and if the calculated current value is smaller than the threshold value, rewriting an instruction for reading the second preset current range channel data, and automatically identifying the acquired current according to the fact that the sampling value read by the second preset current range is an actual test value, so that manual gear shifting is avoided.
The basic formula is as follows:
I＝V/R×Amp
I:Actual current value
V:The voltage value converted by the digital-to-analog converter
R:Sampling resistor
Amp:Instrumentation amplifier magnification
Specific indexes are as follows:
Drawings
in order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a current detection module of the control circuit according to the present invention;
FIG. 2 is a schematic diagram of a specific structure of the current detecting module of the control circuit according to the present invention;
FIG. 3 is a schematic structural diagram of a voltage acquisition unit according to the present invention;
The device comprises a 100-control circuit detection current module, a 1-signal input module, a 2-conversion module, a 3-power supply module, a 4-single chip microcomputer, a 5-CPU, a 21-sampling resistor, a 22-amplifier, a 23-voltage acquisition unit, a 24-digital isolation chip, a 25-first serial communication interface, a 26-second serial communication interface, a 27-inverter, a 28-third serial communication interface, a 31-external power supply, a 32-power isolation chip, a 33-first voltage conversion circuit, a 34-second voltage conversion circuit, a 231-analog-to-digital converter and a 232-chip register.
Detailed Description
reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Further, in the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
referring to fig. 1 to 3, the present invention provides a four-channel dual-gear interface control circuit current detection system, which includes four control circuit current detection modules 100, wherein the four control circuit current detection modules 100 are connected in series, and have four channels, i.e., the current values of the four external channels can be measured, each channel is divided into two ranges, one channel is used for measuring a large current, and the other channel is used for measuring a small current.
Specifically, each control circuit current detection module 100 includes a signal input module 1, a conversion module 2, a power supply module 3, a single chip microcomputer 4 and a CPU5, the conversion module 2 is electrically connected with the input module, the power supply module 3 is electrically connected with the conversion module 2, the single chip microcomputer 4 is electrically connected with the conversion module 2, the CPU5 is mounted on the single chip microcomputer 4,
the signal input module 1 is a current collector and is used for collecting an external current signal; the analog quantity acquisition module can be an HC-20316 analog quantity acquisition module or an HC-2212 analog quantity acquisition module;
the conversion module 2 is used for carrying out differential amplification processing and voltage acquisition processing on the external current signal; the conversion module 2 comprises a sampling resistor 21, an amplifier 22, a voltage acquisition unit 23, a digital isolation chip 24, a first serial communication interface 25, a second serial communication interface 26, an inverter 27 and a third serial communication interface 28, wherein the voltage acquisition unit 23 comprises an analog-to-digital converter 231(ADC) and a chip register 232; the sampling resistor 21 is connected in series with the signal input module 1, the number of the amplifiers 22 is two, the two amplifiers 22 are respectively electrically connected with the sampling resistor 21, and the voltage acquisition unit 23 is electrically connected with the two amplifiers 22; the number of the analog-to-digital converters 231 is two, each analog-to-digital converter 231 is electrically connected with each amplifier 22, and the chip register 232 is electrically connected with the CPU 5; the number of the digital isolation chips 24, the first serial communication interfaces 25 and the second serial communication interfaces 26 is two, the digital isolation chips 24 are in data communication with the voltage acquisition unit 23 through the two first serial communication interfaces 25 respectively, and the digital isolation chips 24 are in data communication with the single chip microcomputer 4 through the two second serial communication interfaces 26 respectively; the inverter 27 is electrically connected with the two second serial communication interfaces 26, and performs data communication with the single chip microcomputer 4 through the third serial communication interface 28; the external current signal is connected in series with one sampling resistor 21, the resistance value can be 100 milliohms, two ends of the sampling resistor 21 are respectively connected to the circuit input end composed of the precision instrument amplifier 22 for differential amplification of different multiples, the influence of circuit interference can be reduced, the type of the amplifier 22 can be INA821, two amplified signals are respectively connected to two analog input channels of the voltage acquisition unit 23, the voltage acquisition unit 23 is an ADS1247 chip, because the voltage acquisition unit 23 comprises two analog-to-digital converters 231, the analog-to-digital converters 231 simultaneously convert two analog signals of which the input signals are continuously changed into discrete digital signals, simultaneously, the discrete digital signals are filtered by the digital isolation chip 24 through the first serial communication interface 25SPI and then transmitted to the phase inverter 27 through the second serial communication interface 26SPI, the inverter 27 is further transmitted to the single chip microcomputer 4 through the third serial communication interface 28SPI, the analog-to-digital converter 231 adopts a four-wire SPI, that is, two first serial communication interfaces 25SPI and two second serial communication interfaces 26SPI are in daisy chain connection with the inverter 27, so that IO port resources are greatly reduced, and the type of the digital isolation chip 24 is ADUM1401 BRW; the voltage acquisition unit 23 further includes a serial interface controller (serial interface and control), an Adjustable Digital filter (Adjustable Digital filter), a third order Modulator (3rd order Modulator), a Programmable Gain Amplifier (PGA) 22, a system monitor (system monitor), an input multiplexer (input mux), a butout detector (Bumout Detect), an internal oscillator (intemal oscillator), a Vref multiplexer (Vref mux), the serial interface controller connects a DRDY argument and a START argument, the chip register 232 includes an IDAC0 register and an ODR register, starting the ADS1247 chip requires providing precise control conversion, and the pulse START pin STARTs to convert from a high level. The conversion is completed by pulling the DRDY pin low, which means that when the DRDY mode bit in the IDAC0 register is 1, the DOUT/DRDY pin is set low, when the conversion is completed, the chip internally and automatically stores the data in the ODR register and stops the conversion, and then the conversion result can be read. However, before communication with the chip begins, the configuration verification operation must be performed on the chip register 232, and the CPU5 writes an internally fixed configuration command into the ADS1247 chip register 232, obtains a return value of the chip, and verifies whether the chip is working properly, if the return value is not obtained, the chip is connected or has a problem in other aspects, and the chip needs to be replaced or other operations are performed. When the data conversion is completed, the DRDY pin is set to be low, the data conversion is stopped, and the chip is not in a starting state until the START pin is set to be high so as to prepare for starting new level data conversion. When the start pin returns high, the decimation filter is held in the reset state and the internal 32 modulator clock cycles stabilize the analog circuit. The idle state of the ADS1247 chip is defaulted to high level, and the clock jumps and is effective at the first falling edge.
when the START pin is high, the ADC will perform successive data transitions on the selected input channel. This transition process until the DRDY pin is lowered may also be used to perform synchronous measurement of multi-channel data through the pulse enable pin. When a plurality of ADC chips are used, if each chip receives a START pulse at the same time, all devices START data conversion when the level of the START pin rises, high-low level conversion of the START pin can be controlled by sending an instruction through the SPI, if the same level conversion rate is set inside all the ADC chips, all the chips can complete conversion at the same time, and when the data conversion is completed, the data conversion inside the chips can be closed by controlling the START pin to be at the low level, so that the cost of the chips is saved. In the above operation steps, the CPU5 may control the register to pull up the IO port corresponding to the START pin, so that the START pin is in a high level state, the ADS1247 chip may perform level data conversion correspondingly, and when the conversion is completed, the DRDY pin may be pulled down, which indicates that the data conversion is completed. Meanwhile, the inverter 27 cooperates with a chip select signal in the CPU5, so that the chip select signal controls two digital isolation MISO enable pins and a chip select pin, so that the first serial communication interface 25, the second serial communication interface 26 and the third serial communication interface 28 communicate orderly. The single chip 4 calculates the real collecting voltage value according to a formula and then divides the real collecting voltage value by the actual resistance value of the sampling resistor 21 connected in series to obtain the current value to be collected. In addition, since the reference voltage of the voltage acquisition unit 23 is 2.5V, that is, the maximum voltage value of 2.5V can be acquired, the maximum voltage value in the amplification circuit cannot exceed the amplitude, so that 500 times of amplification is adopted for 0-6mA current signals, and 10 times of amplification is adopted for 6mA-2A current signals, and finally, the signals are all amplified within the range of the measurement range which can be acquired by the voltage acquisition unit 23.
the power supply module 3 is used for supplying power to the conversion module 2; the power supply module 3 comprises an external power supply 31, a power isolation chip 32, a first voltage conversion circuit 33 and a second voltage conversion circuit 34, wherein the power isolation chip 32 is electrically connected with the external power supply 31, the first voltage conversion circuit 33 is electrically connected with the two amplifiers 22 and the power isolation chip 32, and the second voltage conversion circuit 34 is electrically connected with the two amplifiers 22 and the power isolation chip 32; the external power supply 31 supplies power for a bipolar power supply and outputs positive and negative preset voltages; the first voltage conversion circuit 33 is configured to convert and output a preset positive voltage; the second voltage conversion circuit 34 is configured to convert and output a preset negative voltage; the power isolation chip 32 is isolated by an A0505S or A0503S DC-DC chip to output plus and minus 5V or plus and minus 3.3V voltage, and then the first voltage conversion circuit 33 and the second voltage conversion circuit 34 output plus and minus 2.5V voltage to supply power for the system.
The single chip microcomputer 4 is used for writing an instruction for reading first preset current range channel data into the conversion module 2, performing judgment again according to the calculated current value, and if the calculated current value is greater than or equal to the threshold value, the read sampling value is an actual test value; and if the calculated current value is smaller than the threshold value, rewriting an instruction for reading second preset current range channel data, and automatically identifying the magnitude of the acquired current according to the fact that the sampling value read by the second preset current range is an actual test value. The first preset current range is a large current range, the second preset current range is a small current range, according to the difference of the input signals, the CPU5 defaults to write an instruction of large current range channel data into the chip register 232 in the ADS1247 chip, then the CPU5 performs re-judgment according to the calculated current value, when the calculated current value in the CPU5 is greater than or equal to the threshold value, the default read sampling value of the CPU5 is used as the actual test value of the product, when the default read sampling value is smaller than the threshold value, the data is abandoned and rewritten into the instruction of reading small current range channel data, the collected data of the small range gear is obtained from the ADS1247 chip and used as the actual test value of the product, the collected current is automatically identified, so that the problem of manual gear shifting is avoided, convenience and rapidness are achieved, and the experience of users is enhanced.
the four-channel double-gear interface control circuit current detection system has the advantages that the test circuit and the main control circuit are completely physically isolated through the power isolation chip 32 and the digital isolation chip 24, the interference of the external environment on voltage acquisition is greatly reduced, the error of current measurement is further reduced, the measurement stability is enhanced, the effective digit of the current measurement is improved, namely the overall measurement precision is ensured, meanwhile, when the current values of different ranges are tested, judgment is carried out according to specific values, the corresponding channel is selected for measuring the range of the specific current, the accurate measurement of currents of 0-2A and 0-6mA ranges is well solved, the test precision of the 0-2A range can reach 0.1%, the effective reading can guarantee 1mA, the test precision of the 0-6mA range can reach 0.1%, and the effective reading can guarantee 10uA, the selection range is automatically identified, manual gear shifting is not needed, and the experience and convenience of a user are enhanced.
while the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. A four-channel double-gear interface control circuit detection current system is characterized in that,
Comprises four control circuit current detection modules, wherein each control circuit current detection module comprises a signal input module, a conversion module, a power supply module, a digital isolation and reverser combination module, a singlechip and a CPU, the conversion module is electrically connected with the input module, the power supply module is electrically connected with the conversion module, the singlechip is electrically connected with the conversion module, the CPU is carried on the singlechip,
The signal input module is used for acquiring an external current signal;
The conversion module is used for carrying out differential amplification processing and voltage acquisition processing on an external current signal;
the power supply module is used for supplying power to the conversion module;
The combined module of the digital isolation and the phase inverter ensures that the detection circuit is completely isolated from the master control circuit physically, and ensures normal communication of data.
the single chip microcomputer is used for writing an instruction for reading first preset current range channel data into the conversion module, carrying out judgment again according to the calculated current value, and if the calculated current value is larger than or equal to the threshold value, the read sampling value is an actual test value; and if the calculated current value is smaller than the threshold value, rewriting an instruction for reading second preset current range channel data, and automatically identifying the magnitude of the acquired current according to the fact that the sampling value read by the second preset current range is an actual test value.
2. the four-channel, two-gear interface control circuit sense current system of claim 1,
The conversion module comprises sampling resistors, amplifiers and voltage acquisition units, the sampling resistors are connected with the signal input module in series, the number of the amplifiers is two, the two amplifiers are respectively and electrically connected with the sampling resistors, and the voltage acquisition units are electrically connected with the two amplifiers; wherein the content of the first and second substances,
the amplifier is used for receiving the corresponding path of input signals and performing differential amplification processing of different multiples on the input signals;
And the voltage acquisition unit is used for simultaneously acquiring the voltages of the two paths of input signals and outputting the voltages to the singlechip for calculation.
3. The four-channel, two-gear interface control circuit sense current system of claim 2,
the interface control circuit controls the Darlington tubes by adopting a CPU (central processing unit) so as to control relays of 4 channels to control the input on-off of external signals, the voltage acquisition unit comprises low-temperature-drift precision sampling resistance instrument amplifiers, the number of the analog-to-digital converters is 4, each analog-to-digital converter is electrically connected with each amplifier, and the chip register is electrically connected with the CPU; the analog-to-digital converter is used for simultaneously converting analog signals of two paths of input signals, which continuously change, into discrete digital signals;
and the chip register is used for receiving the instruction written by the CPU for reading the current range channel data.
4. the four-channel, two-gear interface control circuit sense current system of claim 2,
The power supply module comprises an external power supply, a power isolation chip, a combination of a digital isolation chip and a phase inverter, a first voltage conversion circuit and a second voltage conversion circuit, wherein the power isolation chip is electrically connected with the external power supply, the first voltage conversion circuit is electrically connected with the two amplifiers and the power isolation chip, and the second voltage conversion circuit is electrically connected with the two amplifiers and the power isolation chip; wherein the content of the first and second substances,
the external power supply is used for supplying power to the bipolar power supply and outputting positive and negative preset voltages;
The power supply isolation chip is used for isolating the current measurement and control circuit from the main control circuit;
the combination of the digital isolation chip and the phase inverter is used for completely physically isolating the detection circuit from the main control circuit and exchanging data between the CPU and the data converter, and because the general digital isolation chip only has high and low level two-state output, the combination of the digital isolation chip and the phase inverter is skillfully adopted, so that the control and data exchange between the CPU and the data converter can be normally carried out.
The first voltage conversion circuit is used for converting and outputting a preset large-current conversion voltage;
and the second voltage conversion circuit is used for converting and outputting a preset low-current conversion voltage.
5. the four-channel, two-gear interface control circuit sense current system of claim 1,
the conversion module further comprises two digital isolation chips, a first serial communication interface and a second serial communication interface, the digital isolation chips are in data communication with the voltage acquisition unit through the two first serial communication interfaces respectively, and the digital isolation chips are in data communication with the single chip microcomputer through the two second serial communication interfaces respectively; wherein the content of the first and second substances,
The combined module of the digital isolation and the phase inverter ensures that the detection circuit is completely isolated from the master control circuit physically, and ensures normal communication of data.
And the first serial communication interface and the second serial communication interface are used for controlling high-low level conversion of pins according to the CPU instruction so as to realize data communication transmission.
6. the four-channel, two-gear interface control circuit sense current system of claim 5,
The conversion module further comprises an inverter and a third serial communication interface, wherein the inverter is electrically connected with the two second serial communication interfaces and is in data communication with the single chip microcomputer through the third serial communication interface;
The phase inverter is used for matching with a chip selection signal in the CPU, and the chip selection signal controls two digital isolation MISO enabling pins and a chip selection pin to enable the first serial communication interface, the second serial communication interface and the third serial communication interface to communicate orderly.
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| CN112485507A (en) * | 2020-11-18 | 2021-03-12 | 北京时代民芯科技有限公司 | Method for testing transmission current of daisy chain communication circuit |
| CN114265349A (en) * | 2021-12-20 | 2022-04-01 | 贵州振华风光半导体股份有限公司 | Multichannel fully-differential high-voltage high-precision real-time data acquisition system |
| CN114487582A (en) * | 2022-01-30 | 2022-05-13 | 北京思凌科半导体技术有限公司 | Current detection device and current detection system |
| CN114624500A (en) * | 2022-04-20 | 2022-06-14 | 四川大学 | Precision measurement system for pA-level weak current |
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Application publication date: 20191213 |