CN109738774A - A kind of diode detection instrument - Google Patents
A kind of diode detection instrument Download PDFInfo
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- CN109738774A CN109738774A CN201811438991.6A CN201811438991A CN109738774A CN 109738774 A CN109738774 A CN 109738774A CN 201811438991 A CN201811438991 A CN 201811438991A CN 109738774 A CN109738774 A CN 109738774A
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Abstract
A kind of diode detection instrument is circumscribed with host computer, including ARM controller module, JTAG download module, RS485 communication module, connecting and disconnecting of the circuit control module, voltage acquisition module and I2C data demarcating module；The ARM controller module is for controlling entire hardware circuit；The ARM controller module controls program needed for downloading by the JTAG download module from host computer；The ARM controller module is connect by RS485 communication module with host computer, realizes the information exchange between ARM controller module and host computer, while host computer being made to send target control instruction according to the communication protocol of setting and receive data；Simultaneously the ARM controller module-external pin and hardware circuit respectively with connecting and disconnecting of the circuit control module, voltage acquisition module and I2The connection of C data demarcating module；The present invention solves the disadvantage that the prior art by above-mentioned control method and circuit design, have many advantages, such as multichannel, automation, accuracy and it is high-efficient, man-machine interactive operation is simple, have broad application prospects.
Description
Technical field
The invention belongs to electronic component detecting instrument technical fields, and in particular to a kind of diode detection instrument.
Background technique
Diode is one of most common electronic component, with one-way conduction.Due to diode use principle very
Simply, it is widely used in the various modulation circuits such as common rectification circuit, detecting circuit, voltage regulator circuit.Diode is going out
It needs the on off operating mode to diode, voltage parameter etc. to detect before factory, guarantees the stability of its performance.The prior art is benefit
Detection is carried out with intelligent multimeter to judge, and detect diode on-off synchronous cannot carry out with voltage acquisition work, and be unable to shape
Automatic testing process in batch, single channel the degree of automation is not high, and accuracy is low, and operating efficiency is low, is unfavorable for electronic component
It is efficient production and detection.
Summary of the invention
Technical problems to be solved:
In order to avoid the shortcomings of the prior art, the present invention provides a kind of diode detection instrument of fast accurate, energy
Realize multi-channel detection diode on-off and voltage acquisition function, enough to solve the caused above problem in existing detection technique.
The technical scheme is that a kind of diode detection instrument, is circumscribed with host computer, it is characterised in that: including ARM
Controller module, JTAG download module, RS485 communication module, connecting and disconnecting of the circuit control module, voltage acquisition module and I2C data
Demarcating module；
The ARM controller module is for controlling entire hardware circuit；The ARM controller module passes through under the JTAG
It carries needed for module is downloaded from host computer and controls program；The ARM controller module is connected by RS485 communication module and host computer
It connects, is instructed so that host computer sends target control to ARM controller module according to the communication protocol of setting, and receive ARM control
The data of device module；Simultaneously the ARM controller module-external pin and hardware circuit respectively with connecting and disconnecting of the circuit control module, electricity
Press acquisition module and I2The connection of C data demarcating module；
The connecting and disconnecting of the circuit control module includes transformation from serial to parallel output displacement buffer, relay, external high-accuracy and constant
Stream source；The transformation from serial to parallel output displacement buffer input is connect with the ARM controller module, and output end succeeds electricity
Device coil；The normally opened contact of each diode to be measured relay in parallel, all Diode series to be measured connect and by outer
It connects high precise current source and detection electric current is provided, realize connecting and disconnecting of the circuit control；
The voltage acquisition module is that difference turns single-ended hardware circuit, including analog switch and operational amplifier circuit；The simulation
The gating control terminal of switch is connect with the ARM controller module, and input terminal is connect with diode to be measured, output end access
Operational amplifier circuit obtains single ended voltage, and the ADC I/O port that single ended voltage accesses the ARM controller module is completed two pole to be measured
The voltage acquisition of pipe；
The I2C data demarcating module is used for the voltage data of diode to be measured collected to the voltage acquisition module
It is demarcated, calibration factor is written in required control program and voltage data calibration is completed using linear regression method, it can
Improve voltage acquisition precision；
ARM controller module obtains electric/power loss by controlling the relay coil of the connecting and disconnecting of the circuit control module, realizes more
Channel, automatic detection diode to be measured on-off；What the analog switch gating command by controlling voltage acquisition module was specified
Diode to be measured completes the voltage acquisition to diode to be measured.
A further technical solution of the present invention is: voltage needed for the ARM controller module is 3.3V.
A further technical solution of the present invention is: the JTAG download module is by drawing 8 needles by ARM controller module
Plug is connect with ARM controller module.
A further technical solution of the present invention is: the relay that the connecting and disconnecting of the circuit control module is selected is 24V power supply.
A further technical solution of the present invention is: the analog switch of the voltage acquisition module is 21V power supply, ADC reference
Voltage is 2.5V.
A further technical solution of the present invention is: the I2Calibration factor in C data demarcating module passes through high precision electro
Table multi collect actual voltage value is pressed, linear regression is carried out and obtains.
Beneficial effect
The beneficial effects of the present invention are: the present invention provides a kind of diode detection instrument, can be realized using same
Detecting instrument detects the following two characteristic of diode；By send control instruction control diodes in parallel to be measured after
The on-off of the normally opened contact of electric appliance can be realized the on-off of multichannel, automatic detection diode to be measured, overcome existing detection
The shortcomings that technical operation inefficiency；Software calibration is carried out again by the voltage data acquired to diode to be measured, is improved
Operation accuracy；And host computer human-computer interaction interface can be developed, and realize the real-time communication of upper and lower machine, it is easy to operate, convenient for control
System.
The bus communication between ARM controller and host computer is realized using RS485 communication module, and there is anti-interference ability
By force, long transmission distance feature.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of diode detection instrument 100 of the present invention；
Fig. 2 is the connection schematic diagram of ARM controller module of the present invention；
Fig. 3 is the connection schematic diagram of JTAG download module of the present invention；
Fig. 4 is the connection schematic diagram of RS485 communication module of the present invention；
Fig. 5 is the connection schematic diagram of connecting and disconnecting of the circuit control module of the present invention；
Fig. 6 is the connection schematic diagram of voltage acquisition module of the present invention；
Fig. 7 is I of the present invention2The connection schematic diagram of C data demarcating module.
Specific embodiment
The embodiments described below with reference to the accompanying drawings are exemplary, it is intended to be used to explain the present invention, and cannot understand
For limitation of the present invention.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise " is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of
The description present invention and simplified description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with spy
Fixed orientation construction and operation, therefore be not considered as limiting the invention.
As shown in Figure 1,100 external host computer (PC) of a kind of diode detection instrument of the invention, including ARM controller mould
Block 101, JTAG download module 102, RS485 communication module 103, connecting and disconnecting of the circuit control module 104,105 and of voltage acquisition module
I2C data demarcating module 106.
ARM controller module 101 is for controlling entire hardware circuit；ARM controller module 101 passes through JTAG download module
102 download itself required control program from host computer (PC)；ARM controller module 101 by RS485 communication module 103 with it is upper
Position machine connection, realizes the information exchange between ARM controller module 101 and host computer, while making host computer according to the logical of setting
Believe that agreement sends target control instruction and receives data；Simultaneously 101 external pin of ARM controller module and hardware circuit respectively with
Connecting and disconnecting of the circuit control module 104, voltage acquisition module 105 and I2C data demarcating module 106 connects.
When ARM controller module receives the control instruction of host computer (PC) transmission, internal control program can be controlled
Connecting and disconnecting of the circuit control module, voltage acquisition module and I processed2C data demarcating module executes corresponding movement.When ARM controller mould
When block receives the control instruction of detection diode on-off to be measured of host computer transmission, on the external high precise current source is automatic
Electricity provides predetermined current, and ARM controller controls the relay coil and obtains electric/power loss, to realize multichannel, automation inspection
Survey the on-off of diode to be measured；When ARM controller module receives the acquisition diode both end voltage to be measured of host computer transmission
When control instruction, ARM controller module controls the specified diode to be measured of the analog switch gating command, completes to be measured two
The voltage acquisition of pole pipe；
As shown in Fig. 2, ARM controller module 101 is ARM controller for controlling entire hardware circuit, U1A and U1B
STM32F103VxT6, external crystal-controlled oscillation 8MHz；U2 is that 24V turns 3.3V voltage regulator circuit, and U3 is that 3.3V turns 2.5V voltage regulator circuit；P1 is
External 24V power supply socket, P4 are external high precision constant current supply socket, and P2 is empty pin socket ready for use；External LED1
For power supply indicator, when 24V power supply power supply, LED1 is lighted.
As shown in figure 3, JTAG1 is the 8 needle plugs drawn by ARM controller, it is connected under J_Link using Du Pont's line
Carry device, downloader is connect by USB interface with host computer (PC), can be carried out by J-Link online procedure simulation, debugging and
Program downloading.
As shown in figure 4, U4 be RS485 communicating circuit, USART1-TXD, USART1-RXD, USART-RE pin respectively with
78,79,80 feet of ARM controller connect, and differential signal line 485-A, 485-B are connected to DB9 socket J5, by 485 interfaces or
485 turns of USB serial converters are connect with host computer, are exported according to set communication protocol by host computer programming control signal,
Realize data transmission and the data receiver between ARM controller and host computer.
Connecting and disconnecting of the circuit control module 104 is by transformation from serial to parallel output displacement buffer, relay, external high precision constant current
The hardware circuit in source and diode to be measured composition；The transformation from serial to parallel output displacement buffer input and the ARM are controlled
The connection of device module, output relay termination coil, the normally opened contact of each diode to be measured relay in parallel,
All Diode series connections to be measured simultaneously provide detection electric current by external high precise current source, realize connecting and disconnecting of the circuit control；
As shown in figure 5, U16 and U18 turn parallel output displacement for cascade dual serial and delay when detecting 10 diodes
Storage, serial input control pin are connect with ARM controller, and the input terminal of parallel output and signal driving chip U17 and U19 connect
It connects；Coil one end of relay RELAY1-RELAY11 is connect with the output pin of U17 and U19, another termination 24V power supply, after
The normally opened contact of electric appliance RELAY1-RELAY10 is successively connected in parallel on 10 testing resistance LED_1 to the both ends LED_10, relay
The normally opened contact one of RELAY11 terminates power ground, another to terminate external high precise current source cathode, wherein relay RELAY1-
U5-U15 in RELAY11 corresponding diagram 5；LED_1 to LED_10 is connected in series and provides detection electricity by external high precise current source
Stream, positive and negative electrode are respectively led into DB15 plug JP1 and JP2.
The working principle of detection diode on-off is described in further detail below:
When host computer sends detection diode (LED) _ 1 on-off control instruction, external high precise current source powers on automatically,
Predetermined current is provided, ARM controller module controls cascade corresponding 4 hexadecimal datas of U16 and U18 parallel output, makes
The coil losing electricity of relay RELAY1, normally opened contact disconnect, and the coil of relay RELAY2-RELAY10 obtains electric, normally opened contact suction
Close, i.e., only LED_1 access circuit, LED_2 to LED_10 are short-circuited, after ARM controller has executed control instruction understand to
Host computer replys following corresponding information: 1. external high precise current source normal power supplies, replys " detection resistance LED_1 on-off behaviour
Succeed, LED_1 is logical "；2. external high precise current source is automatically lower electric, reply " detection resistance LED_1 on-off line operation success,
LED_1 is disconnected "；3. miscommunication executes order failure, reply " detection resistance LED_1 on-off line operation failure "；The above process is
It completes and corresponds to the detection of diode on-off under control instruction.Similarly, it may be implemented in diode (LED) _ 1 to LED_10 any combination
Control command under diode on-off detect, also may be implemented successively to detect LED_1 under the time interval of setting to LED_10
On-off this automatic testing process.
The voltage acquisition module turns single-ended hardware circuit by the difference that analog switch and diode to be measured form；It is described
The gating control terminal of analog switch is connect with the ARM controller module, and input terminal is connect with diode to be measured, output end
Access differential turns single-end circuit and obtains single ended voltage；And the ADC I/O port that single ended voltage accessed the ARM controller module is complete
At the voltage acquisition of diode to be measured；
As shown in fig. 6, U22 is that 24V turns 21V voltage regulator circuit；LED2 is that ARM controller runs breath light, is operated normally
It is glittering according to the frequency being written in control program in journey；U20 and U21 be 21V power supply analog switch, gating control pin with
ARM controller connection, input pin meet LED-_1 to LED-_10 and LED+_1 to LED+_10 respectively, and output pin passes through difference
Turn single-end circuit and obtain LED_V, the ADC I/O port for then accessing ARM controller carries out voltage acquisition, which has steady
The advantages that pressing, reducing power supply noise, is anti-interference.
The working principle of voltage acquisition is described in further detail below:
When host computer sends acquisition diode (LED) _ 1 both end voltage control instruction, ARM controller control is cascade
Corresponding 4 hexadecimal datas of U16 and U18 parallel output, obtain the coil of relay RELAY11 electric, and normally opened contact is attracted,
Constant-current source cathode and power cathode altogether, can reduce interference during collection voltages analog quantity at this time；Simultaneously U20 and
U21 gates LED-_1 and LED+_1 respectively, and ARM controller acquires actual voltage value LED_V and the Xiang Shangwei after data scaling
Machine replys that " acquisition of diode (LED) _ 1 both end voltage operates successfully, data 1.315V " or " diode (LED) _ 1 both end voltage is adopted
Collect operation failure ".Similarly, the voltage acquisition of diode (LED) _ 2 to LED_10 may be implemented.
As shown in fig. 7, U23 is I2Calibration factor a and b is written by control program, to acquisition in C data Calibration Circuit
Voltage data is demarcated:
Y=ax+b
Wherein, a and b is carried out linear regression and is obtained by high-accuracy voltage table multi collect actual voltage value；X is voltage
Collection value, the accuracy of the value and the ADC sample rate of ARM controller are related；Y is voltage calibration value.
When the quantity of diode to be measured is more than 10, detection diode on-off function is by increasing cascade serially turn simultaneously
The number of row output displacement buffer U16 realizes that voltage acquisition function is drawn by using the empty input of analog switch U20 and U21
Foot and the number for increasing analog switch are realized.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art are not departing from the principle of the present invention and objective
In the case where can make changes, modifications, alterations, and variations to the above described embodiments within the scope of the invention.
Claims (6)
1. a kind of diode detection instrument, is circumscribed with host computer, it is characterised in that: download mould including ARM controller module, JTAG
Block, RS485 communication module, connecting and disconnecting of the circuit control module, voltage acquisition module and I2C data demarcating module；
The ARM controller module is for controlling entire hardware circuit；The ARM controller module downloads mould by the JTAG
Block controls program needed for downloading from host computer；The ARM controller module is connect by RS485 communication module with host computer, is made
It obtains host computer and sends target control instruction to ARM controller module according to the communication protocol of setting, and receive ARM controller module
Data；Simultaneously the ARM controller module-external pin and hardware circuit respectively with connecting and disconnecting of the circuit control module, voltage acquisition
Module and I2The connection of C data demarcating module；
The connecting and disconnecting of the circuit control module includes transformation from serial to parallel output displacement buffer, relay, external high precise current source；
The transformation from serial to parallel output displacement buffer input is connect with the ARM controller module, exports relay termination line
Circle；The normally opened contact of each diode to be measured relay in parallel, all Diode series to be measured connect and by external height
Precise current source provides detection electric current, realizes connecting and disconnecting of the circuit control；
The voltage acquisition module is that difference turns single-ended hardware circuit, including analog switch and operational amplifier circuit；The analog switch
Gating control terminal connect with the ARM controller module, input terminal is connect with diode to be measured, output end access amplifier
Circuit obtains single ended voltage, and the ADC I/O port that single ended voltage accesses the ARM controller module is completed diode to be measured
Voltage acquisition；
The I2Voltage data of the C data demarcating module for diode to be measured collected to the voltage acquisition module carries out
Calibration factor is written in required control program and completes voltage data calibration using linear regression method, can be improved for calibration
Voltage acquisition precision；
ARM controller module obtains electric/power loss by controlling the relay coil of the connecting and disconnecting of the circuit control module, realizes multi-pass
The on-off in road, automatic detection diode to be measured；Analog switch gating command by controlling voltage acquisition module it is specified to
Diode is surveyed, the voltage acquisition to diode to be measured is completed.
2. diode detection instrument according to claim 1, it is characterised in that: voltage needed for the ARM controller module is
3.3V。
3. diode detection instrument according to claim 1, it is characterised in that: the JTAG download module is by by ARM
Controller module is drawn 8 needle plugs and is connect with ARM controller module.
4. diode detection instrument according to claim 1, it is characterised in that: the connecting and disconnecting of the circuit control module select after
Electric appliance is 24V power supply.
5. diode detection instrument according to claim 1, it is characterised in that: the analog switch of the voltage acquisition module is
21V power supply, ADC reference voltage are 2.5V.
6. diode detection instrument according to claim 1, it is characterised in that: the I2Calibration system in C data demarcating module
Number is carried out linear regression and is obtained by high-accuracy voltage table multi collect actual voltage value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811438991.6A CN109738774A (en) | 2018-11-29 | 2018-11-29 | A kind of diode detection instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811438991.6A CN109738774A (en) | 2018-11-29 | 2018-11-29 | A kind of diode detection instrument |
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| Publication Number | Publication Date |
|---|---|
| CN109738774A true CN109738774A (en) | 2019-05-10 |
Family
ID=66358193
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811438991.6A Pending CN109738774A (en) | 2018-11-29 | 2018-11-29 | A kind of diode detection instrument |
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Application publication date: 20190510 |