CN111273575A - Intelligent sensor analog simulation and automatic detection device - Google Patents
Intelligent sensor analog simulation and automatic detection device Download PDFInfo
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- CN111273575A CN111273575A CN201910802518.XA CN201910802518A CN111273575A CN 111273575 A CN111273575 A CN 111273575A CN 201910802518 A CN201910802518 A CN 201910802518A CN 111273575 A CN111273575 A CN 111273575A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24215—Scada supervisory control and data acquisition
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
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Abstract
The invention belongs to the technical field of analog simulation and automatic test of electronic intelligent sensors, and relates to an analog simulation and automatic detection device of an intelligent sensor, which comprises a shell, an analog resistance output terminal, an analog voltage output terminal, a touch display screen, a detection input terminal, a main control module, a power supply module, an analog resistance module, an analog voltage module, a detection module and an isolation communication bus, wherein ten paths of resistance output channels are used for simulating and simulating temperature sensor signals, two paths of voltage output channels are used for simulating and simulating humidity sensor signals, six paths of detection channels are used for detecting voltage, frequency and duty ratio, and the power supply module is connected with the main control module, the analog resistance module, the analog voltage module and the detection module through a power supply wire harness to supply power; the test system has multiple test functions, short detection time, large measurement range, high precision, convenient operation, safety, reliability, good universality, convenient popularization and environment-friendly application, and reduces the test equipment and the occupied space thereof.
Description
The technical field is as follows:
the invention belongs to the technical field of analog simulation and automatic test of electronic intelligent sensors, and relates to a high-precision multi-channel multifunctional automatic test device for measuring voltage, frequency and PWM (pulse width modulation) duty ratio, in particular to a test device capable of simulating multi-channel temperature sensor signal output, multi-channel humidity sensor signal output and detecting control logic of a household appliance circuit board.
Background art:
at present, before formal mass production of household appliances, strict test needs to be carried out on the program control logic of a control board. Firstly, inputting a specific temperature signal, a specific humidity signal or a specific switching signal and the like to a control board, then measuring a voltage signal, a specific frequency signal or a specific PWM (pulse-width modulation) duty ratio signal and the like output by the control board, comparing the measured signal with a design requirement signal, and judging whether a program control logic of the control board meets the specification requirement.
The input signals of the temperature sensor signal, the humidity sensor signal and the like of the control panel are usually analog signals, and for the temperature sensor signal of a resistor type, a mechanical resistor box is generally adopted to simulate the temperature signal output at present, for example, a specific temperature signal is output, a corresponding resistance value is found by comparing a target temperature with a sensor specification, and then the corresponding resistance value is output by adjusting the resistor box; for the signal output of the voltage type humidity sensor, a voltage signal source is generally adopted to simulate the humidity signal output at present, for example, to output a specific humidity signal, a corresponding voltage value is found by comparing a target humidity with a sensor specification, and then the voltage signal source is adjusted to output the corresponding voltage value; for the detection of duty ratio signals, the current universal meters on the market can only test the duty ratio of low-frequency signals, and can only connect oscilloscopes to measure the duty ratio of higher frequencies above 10KHz, and a plurality of duty ratio signals are output in some circuit board control systems; in addition, each path of voltage or frequency signal needs a universal meter to monitor and measure; the simulation test method needs more and scattered test equipment, occupies a large area, is adjusted item by item manually, is long in adjustment time, wastes time and labor, is greatly influenced by human factors in the detection process, is unreliable in detection result, is narrow in measurement range of the conventional measuring instrument, is expensive in oscilloscope price, has few test channels, and is high in cost for common laboratory and enterprise production lines.
Therefore, an intelligent sensor analog simulation and automatic detection device is sought to be designed, which is provided with 10 analog output temperature sensor signal channels, 2 analog output humidity sensor signal channels and 6 detection channels and is used for measuring voltage, frequency and PWM duty ratio and detecting the control logic of a household appliance control board.
The invention content is as follows:
the invention aims to overcome the defects in the prior art, and provides an intelligent sensor analog simulation and automatic detection device, so that the problems of more used equipment and large occupied area in the traditional circuit board test are solved, the difficulties that the existing detection process is complicated and troublesome, manual item-by-item adjustment is relied on, the adjustment time is long, time and labor are wasted are overcome, the phenomenon that the detection result is inaccurate due to human factors is avoided, the measurement range is enlarged, the test efficiency is improved, and the test cost is reduced.
In order to achieve the above object, the main structure of the device of the present invention comprises: the device comprises a shell, an analog resistance output terminal, an analog voltage output terminal, a touch display screen, a detection input terminal, a main control module, a power supply module, an analog resistance module, an analog voltage module, a detection module and an isolation communication bus; the shell is of a rectangular shell structure and is made of aluminum alloy material; ten pairs of analog resistance output terminals are arranged on the left half part of the front side surface of the shell, two pairs of analog voltage output terminals are arranged on the left lower part, a touch display screen is arranged on the right upper part, and six pairs of detection input terminals are arranged on the right lower part; a main control module, a power supply module, an analog resistance module, an analog voltage module and a detection module are fixedly arranged in the shell, and the main control module is respectively in communication connection with the analog resistance module, the analog voltage module and the detection module through isolated communication buses; the main control module comprises a control circuit board, a chip with a control program is embedded in the control circuit board, the power supply module consists of two identical power supply circuit boards, the input voltage is distributed to the main control module, the analog resistance module, the analog voltage module and the detection module, and power is provided for each circuit board of the whole test system; the analog resistance module comprises ten circuit boards with the same analog resistance output, all the circuit boards are connected through an isolation communication bus, and each circuit board is connected with a pair of analog resistance output terminals to form ten paths of resistance output channels for simulating analog temperature sensor signals; the analog voltage module comprises two identical circuit boards for controlling voltage output, the circuit boards are connected through an isolation communication bus, and each circuit board is connected with a pair of analog voltage output terminals to form two voltage output channels for simulating humidity sensor signals; the detection module comprises six identical circuit boards for controlling detection, the circuit boards are connected through an isolation communication bus, each circuit board is connected with a pair of detection input terminals to form six detection channels for detecting voltage, frequency and duty ratio, and the six detection channels can respectively measure a voltage signal, a frequency signal and a duty ratio signal; each channel of analog resistance channel, analog voltage channel and detection channel are independently powered and are electrically insulated from other channels, input or output signals of each channel are mutually isolated and do not influence each other, and the operation of each channel is controlled by the main control module. The touch display screen is provided with an output mode of the analog temperature sensor for selection: resistance, degrees celsius, degrees fahrenheit; setting the type of the analog temperature sensor for selection; the output mode of the analog humidity sensor is set for selection: voltage, humidity percentage; alternative measurement modes are provided: voltage, frequency and duty ratio, and recording and displaying the measured values and input set values of the six detection channels. The chip of the main control module is internally provided with a conversion program of corresponding relation between resistance and temperature and a conversion program of corresponding relation between voltage and humidity, the analog resistance module carries out resistance value analog output according to the principle of resistance equal to voltage/current (R equal to U/I), and the analog voltage module outputs a corresponding target voltage value by adopting the DAC (digital-to-analog converter) principle. The touch display screen is connected with the power supply module through a power line, the touch display screen is connected with the main control module through a uart communication line, and the power supply module is connected with the main control module, the analog resistance module, the analog voltage module and the detection module through a power line harness to supply power.
When the temperature sensor simulation circuit is used, when a temperature sensor signal is simulated, a target temperature is input on a corresponding channel on a touch display screen, after a main control module receives the signal, chip program operation is carried out, a resistance value corresponding to a temperature value is calculated, resistance information is transmitted to a simulation resistance module, the simulation resistance module outputs a corresponding resistance value, the corresponding resistance value is connected to a corresponding terminal of a tested circuit board through a corresponding simulation resistance output terminal, and temperature sensor signal simulation is carried out; when a humidity sensor signal is simulated, a target humidity is input on a corresponding channel on a touch display screen, after the main control module receives the signal, chip program operation is carried out, a voltage value corresponding to the humidity value is calculated, voltage information is transmitted to the simulation voltage module, the simulation voltage module outputs the voltage value, the simulation voltage module is connected to a corresponding terminal of a circuit board to be tested through a corresponding simulation voltage output terminal, and humidity sensor signal simulation is carried out; connecting each corresponding port of the circuit board to be tested to an analog resistor output terminal and an analog voltage output terminal, then connecting each corresponding port of the circuit board to be tested to a detection input terminal of the device, measuring a voltage signal, a frequency signal or a PWM (pulse width modulation) duty ratio signal output by the circuit board, comparing the measured signal with a design requirement signal, and judging whether a program control logic of a control board meets the specification requirement or not; or directly connecting the component or the circuit board to be tested to the detection input terminal, measuring the voltage signal, the frequency signal or the PWM duty ratio signal output by the circuit board, comparing the measured signal with the design requirement signal, and judging whether the program control logic of the control board meets the specification requirement.
Compared with the prior art, the invention integrates signal simulation and voltage, frequency and duty ratio test into a whole, has multiple test functions, is provided with a multi-channel measurement interface, reduces test equipment and the occupied space thereof, is automatically controlled by a main control board, and has short detection time, high detection result accuracy, large measurement range and high precision; the device has the advantages of reasonable and simple integral structure design, scientific principle, convenient operation, safety, reliability, good universality, convenient popularization and environment-friendly application.
Description of the drawings:
fig. 1 is a schematic diagram of the overall structure of the present invention.
The specific implementation mode is as follows:
the invention is further illustrated by the following specific examples in combination with the accompanying drawings.
Example 1:
the intelligent sensor analog simulation and automatic detection device that this embodiment relates to, its major structure includes: the device comprises a shell 1, an analog resistor output terminal 2, an analog voltage output terminal 3, a touch display screen 4, a detection input terminal 5, a main control module 6, a power module 7, an analog resistor module 8, an analog voltage module 9, a detection module 10 and an isolation communication bus 11; the shell 1 is a rectangular shell structure and is made of aluminum alloy materials; ten pairs of analog resistance output terminals 2 are arranged on the left half part of the front side surface of the shell 1, two pairs of analog voltage output terminals 3 are arranged on the left lower part, a touch display screen 4 is arranged on the right upper part, and six pairs of detection input terminals 5 are arranged on the right lower part; a main control module 6, a power supply module 7, an analog resistance module 8, an analog voltage module 9 and a detection module 10 are fixedly arranged in the shell 1, and the main control module 6 is respectively in communication connection with the analog resistance module 8, the analog voltage module 9 and the detection module 10 through an isolation communication bus 11; the main control module 6 comprises a control circuit board, a chip with a control program is embedded in the control circuit board, the power supply module 7 consists of two identical power supply circuit boards, the input voltage is distributed to the main control module 6, the analog resistance module 8, the analog voltage module 9 and the detection module 10, and power is supplied to each circuit board of the whole test system; the analog resistance module 8 comprises ten same circuit boards for outputting analog resistances, the circuit boards are connected through an isolation communication bus 11, and each circuit board is connected with a pair of analog resistance output terminals 2 to form ten paths of resistance output channels for simulating and simulating temperature sensor signals; the analog voltage module 9 comprises two identical circuit boards for controlling voltage output, the circuit boards are connected through an isolation communication bus 11, and each circuit board is connected with a pair of analog voltage output terminals 3 to form two voltage output channels for simulating humidity sensor signals; the detection module 10 comprises six identical circuit boards for controlling detection, the circuit boards are connected through an isolation communication bus 11, each circuit board is connected with a pair of detection input terminals 5 to form six detection channels for detecting voltage, frequency and duty ratio, and the six detection channels can respectively measure a voltage signal, a frequency signal and a duty ratio signal; each path of analog resistance channel, each path of analog voltage channel and each path of detection channel are independently powered and are electrically and independently insulated from other channels, input signals or output signals of the channels are mutually isolated and do not influence each other, and the operation of each channel is controlled by the main control module 6. The touch display screen 4 is provided with an output mode of the analog temperature sensor for selection: resistance, degrees celsius, degrees fahrenheit; setting the type of the analog temperature sensor for selection; the output mode of the analog humidity sensor is set for selection: voltage, humidity percentage; alternative measurement modes are provided: voltage, frequency and duty ratio, and recording and displaying the measured values and input set values of the six detection channels. The chip of the main control module 6 is internally provided with a conversion program of a corresponding relation between resistance and temperature and a conversion program of a corresponding relation between voltage and humidity, the analog resistance module 8 performs resistance value analog output according to a principle that resistance is equal to voltage/current (R is equal to U/I), and the analog voltage module 9 outputs a corresponding target voltage value by adopting a DAC (digital-to-analog converter) principle. Touch display screen 4 is connected with power module 7 through the power cord, and touch display screen 4 is connected with main control module 6 through uart communication line, and power module 7 is connected the power supply through power pencil with main control module 6, analog resistance module 8, analog voltage module 9, detection module 10.
Preferably, the touch display screen 4 adopts a 7-inch liquid crystal screen and adopts a capacitive touch principle to input and control the instrument.
When the temperature sensor signal simulation device is used, when a temperature sensor signal is simulated, a target temperature is input on a corresponding channel on the touch display screen 4, after the main control module 6 receives the signal, chip program operation is carried out, a resistance value corresponding to a temperature value is calculated, resistance information is transmitted to the simulation resistance module 8, the simulation resistance module 8 outputs a corresponding resistance value, the corresponding resistance value is accessed to a corresponding terminal of a circuit board to be tested through the corresponding simulation resistance output terminal 2, and temperature sensor signal simulation is carried out; when a humidity sensor signal is simulated, a target humidity is input on a corresponding channel on the touch display screen 4, after the main control module 6 receives the signal, chip program operation is carried out, a voltage value corresponding to the humidity value is calculated, voltage information is transmitted to the simulated voltage module 9, the simulated voltage module 9 outputs the voltage value, the voltage value is connected to a corresponding terminal of a tested circuit board through a corresponding simulated voltage output terminal 3, and humidity sensor signal simulation is carried out; connecting each corresponding port of the circuit board to be tested to the analog resistor output terminal 2 and the analog voltage output terminal 3, then connecting each corresponding port of the circuit board to be tested to the detection input terminal 5 of the device, measuring a voltage signal, a frequency signal or a PWM duty ratio signal output by the circuit board, comparing the measured signal with a design requirement signal, and judging whether the program control logic of the control board meets the specification requirement or not; or directly connecting the component or circuit board to be tested to the detection input terminal 5, measuring the voltage signal, frequency signal or PWM duty ratio signal output by the circuit board, comparing the measured signal with the design requirement signal, and judging whether the program control logic of the control board meets the specification requirement.
Example 2:
the main structure of the analog simulation and automatic detection device of the intelligent sensor related to the embodiment is the same as that of the embodiment 1, the main control module 6 is simultaneously connected with an upper computer, the upper computer performs command control on the main control module 6, temperature signals and humidity signals required by each channel sensor can be directly input through the upper computer, and input information, measured voltage signals, frequency signals and duty ratio signal information are displayed and stored, so that fully automatic test and long-time unattended test are realized; the device is used for measuring the household appliance circuit board, and is particularly suitable for refrigerators, washing machines and air conditioner circuit boards.
Example 3:
the main structure of the analog simulation and automatic detection device for the intelligent sensor is the same as that of embodiment 1, the touch display screen 4 adopts LCD800 × 480, the main control module 6 adopts MainBoard, the power supply module 7 adopts PowerBoard, the analog resistance module 8 adopts RES, the analog voltage module 9 adopts VoltageSource, the detection module 10 adopts METER and the isolation communication bus 11 adopts an optical coupling isolation 485 communication bus, the analog simulation and automatic detection device for the intelligent sensor adopting the configuration comprises an analog resistance output module, an analog voltage output module, and voltage, frequency and duty ratio detection modules, wherein the voltage, frequency and duty ratio detection modules use a KEYSIGHT34465A high-precision 6-bit half-digit multimeter for comparison test, and the precision is within 0.2%.
Claims (5)
1. An intelligent sensor analog simulation and automatic detection device is characterized in that a main body structure comprises a shell, an analog resistance output terminal, an analog voltage output terminal, a touch display screen, a detection input terminal, a main control module, a power supply module, an analog resistance module, an analog voltage module, a detection module and an isolation communication bus; the shell is of a rectangular shell structure and is made of aluminum alloy material; ten pairs of analog resistance output terminals are arranged on the left half part of the front side surface of the shell, two pairs of analog voltage output terminals are arranged on the left lower part, a touch display screen is arranged on the right upper part, and six pairs of detection input terminals are arranged on the right lower part; a main control module, a power supply module, an analog resistance module, an analog voltage module and a detection module are fixedly arranged in the shell, and the main control module is respectively in communication connection with the analog resistance module, the analog voltage module and the detection module through isolated communication buses; the main control module comprises a control circuit board, a chip with a control program is embedded in the control circuit board, the power supply module consists of two identical power supply circuit boards, the input voltage is distributed to the main control module, the analog resistance module, the analog voltage module and the detection module, and power is provided for each circuit board of the whole test system; the analog resistance module comprises ten circuit boards with the same analog resistance output, all the circuit boards are connected through an isolation communication bus, and each circuit board is connected with a pair of analog resistance output terminals to form ten paths of resistance output channels for simulating analog temperature sensor signals; the analog voltage module comprises two identical circuit boards for controlling voltage output, the circuit boards are connected through an isolation communication bus, and each circuit board is connected with a pair of analog voltage output terminals to form two voltage output channels for simulating humidity sensor signals; the detection module comprises six identical circuit boards for controlling detection, the circuit boards are connected through an isolation communication bus, each circuit board is connected with a pair of detection input terminals to form six detection channels for detecting voltage, frequency and duty ratio, and the six detection channels can respectively measure a voltage signal, a frequency signal and a duty ratio signal; each path of analog resistance channel, each path of analog voltage channel and each path of detection channel are independently powered and are electrically and independently insulated from other channels, input or output signals of each channel are mutually isolated, and the operation of each channel is controlled by the main control module to operate; the touch display screen is provided with an output mode of the analog temperature sensor for selection: resistance, degrees celsius, degrees fahrenheit; setting the type of the analog temperature sensor for selection; the output mode of the analog humidity sensor is set for selection: voltage, humidity percentage; alternative measurement modes are provided: voltage, frequency and duty ratio, and recording and displaying the measured values and input set values of the six detection channels; the touch display screen is connected with the power supply module through a power line, the touch display screen is connected with the main control module through a uart communication line, and the power supply module is connected with the main control module, the analog resistance module, the analog voltage module and the detection module through a power line harness to supply power.
2. The device according to claim 1, wherein a conversion program for a relationship between resistance and temperature and a conversion program for a relationship between voltage and humidity are provided in a chip of the main control module, the analog resistance module performs analog output of a resistance value according to a principle of resistance, voltage and current (R, U/I), and the analog voltage module outputs a corresponding target voltage value according to a DAC (digital-to-analog converter) principle.
3. The analog simulation and automatic detection device of the intelligent sensor according to claim 2, wherein the touch display screen adopts a 7-inch liquid crystal screen and adopts a capacitive touch principle to input and control the instrument.
4. The analog simulation and automatic detection device of any one of the intelligent sensors according to claims 1-3, characterized in that the main control module is connected with an upper computer at the same time, the upper computer performs command control on the main control module, temperature signals and humidity signals required by each channel sensor can be directly input through the upper computer, and input information, measured voltage signals, frequency signals and duty ratio signal information are displayed and stored, so as to realize fully automatic test and long-time unattended test; the device is used for measuring the household appliance circuit board, and is particularly suitable for refrigerators, washing machines and air conditioner circuit boards.
5. The analog simulation and automatic detection device of any one of claims 1-3, wherein the touch display screen adopts LCD800 × 480, the main control module adopts MainBoard, the power module adopts PowerBoard, the analog resistance module adopts RES, the analog voltage module adopts VoltageSource, the detection module adopts METER, the isolation communication bus adopts optical coupling isolation 485 communication bus, and the detection precision is within 0.2%.
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