CN105353292A - Automatic detection device of circuit board of electric energy meter - Google Patents
Automatic detection device of circuit board of electric energy meter Download PDFInfo
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- CN105353292A CN105353292A CN201510266365.3A CN201510266365A CN105353292A CN 105353292 A CN105353292 A CN 105353292A CN 201510266365 A CN201510266365 A CN 201510266365A CN 105353292 A CN105353292 A CN 105353292A
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Abstract
The present invention provides an automatic detection device of a circuit board of an electric energy meter. The detection device provided by the invention comprises a needle bed and a pedestal, wherein the needle bed is connected with the pedestal through a motion bar; 16 probes are distributed on the needle bed and are divided into 8 groups respectively configured to detect the live line and the zero line of the circuit, the voltage of a main power supply, the supply voltage of a CPU module, the supply voltage of a metering module, the supply voltage of a 485 module, a supply voltage of a carrier module, a quiescent current and a 485 communication interface; an infrared communication module is installed above the needle bed with respect to a liquid crystal display; and each probe and an infrared transmit-receive tube are connected with a cow head socket on the pedestal through flat cables. According to the invention, testing personnel only need to observe colors of an indication lamp, and compared with the traditional observation data display instrument, the automatic detection device of a circuit board of an electric energy meter is more convenient, faster and more accurate. Each probe and an infrared transmit-receive tube are connected with a cow head socket on a pedestal so that a needle bed only needs to be replaced and the pedestal is able to be continuously used when electric energy meters with other types are detected, therefore the cost is greatly reduced.
Description
Technical field
The invention belongs to technical field of electromagnetic measurement, be specifically related to the technical field that electric instrument detects frock, particularly a kind of circuit board automatic detection device of electric energy meter.
Background technology
In intelligent electric energy meter production run, in order to ensure the quality of product, frock need be detected by plate and keypoint part voltage several on the finished circuit board welded, electric current are detected, judge welding quality quality, ensure that defective products does not flow into next procedure.
Current circuit board detection device great majority are for electric energy meter finished product, less to the monitoring device of electric energy meter circuit plate, and insufficiency.Existing product shows voltage, electric current with digital display meter, and the weak point of this mode is: 1, metering circuit is not with electrical isolation, may cause damage to electric energy meter circuit plate; 2, need manual read to get digital display meter, then with qualified threshold comparison, efficiency is low and easily make mistakes; 3, communication function cannot be measured; 4, every platform tester can only detect a model electric energy meter, and circuit board cannot reuse after changing, and cost is high.At present, there is no collecting voltage and communication function in the monitoring device of one.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of circuit board automatic detection device of electric energy meter, it is for existing electric energy meter circuit plate testing insufficiency, need to observe digital display meter reading, judgement time long and problem and the circuit board automatic detection device of electric energy meter that proposes such as easily to make mistakes.
According to a first aspect of the present invention, provide a kind of circuit board automatic detection device of electric energy meter, it comprises needle-bar and base, and needle-bar is connected with base by motion bar; Needle-bar is distributed with 16 probes, 2 one group difference detection circuit plate Live line Zero line, main power voltage, CPU module supply voltage, metering module supply voltage, 485 modular power source voltages, carrier module supply voltage, quiescent current, 485 communication interfaces, needle-bar is provided with infrared communication module directly over corresponding liquid crystal display; Each root probe is connected with the ox head socket on base by winding displacement with infrared receiving/transmission Guan Jun.
Wherein, base comprises shift knob, ox head socket, pilot lamp, circuit board; 8 dual-colored LED pilot lamp are provided with above base, indicate the state of main power voltage, CPU module supply voltage, metering module supply voltage, 485 modular power source voltages, carrier module supply voltage, quiescent current, 485 communications, infrared communication respectively, red expression fault, green expression is normal.
Preferably, chassis interior mounting circuit boards, be made up of single-chip minimum system, sample circuit, communication test circuit, power circuit, sample circuit gathers tested ammeter modules voltage, and be input to microprocessor A/D port, transformation result and setting value contrast by microprocessor, judge whether voltage exists fault, and control the display of corresponding pilot lamp; Communication test circuit sends meter reading order by 485 and infrared communications ports, according to the message received, microprocessor judges whether communication line exists fault, and controls the display of corresponding pilot lamp.
Preferably, circuit board is connected with ox head socket, and is connected with probe further, so just the check point of circuit-under-test plate can be introduced single-chip microcomputer respective pins by wire, collection and the monitoring communicated of settling signal.
According to a second aspect of the present invention, provide a kind of circuit board automatic detection device of electric energy meter, it comprises CPU module, AD conversion module, 485 communication modules, infrared communication module, LCD MODULE, LED display module, arranges key-press module; Wherein CPU module is the core of whole system, controls whole testing process, carries out mathematics and logical operation, judges testing result; The voltage of circuit-under-test plate, current signal are converted to digital signal by AD conversion module, are input to CPU and carry out computing, and can realize electrical isolation, protection CPU module; 485 communication modules and infrared communication module detect 485 and infrared communication function of circuit-under-test plate respectively; LCD MODULE and key-press module is set for arranging qualified threshold range; LED display module is for showing testing result, and green is qualified, and redness is defective.
Preferably, AD conversion module comprises two single channel AD conversion chip U7 and U9, a four-way AD conversion chip U11 and DC-DC isolating chip U3; AD conversion chip U7 is for changing 485 modular power source voltages and realizing electrical isolation, AD conversion chip U9 is for changing metering module supply voltage and realizing electrical isolation, AD conversion chip U11 is for changing CPU module supply voltage, carrier module supply voltage, main power voltage, current sample voltage realize electrical isolation, and DC-DC isolating chip U3 is that three AD conversion chip are powered and achieve the electrical isolation of auto testing instrument primary power and AD conversion chip supply voltage; The 485 I/O mouth PA2 that the I/O mouth PA1 that the I/O mouth PA0 that modular power source end V485+, IN-port holds V485-, VSS port earth terminal with connecing 485 modules of circuit-under-test plate, vdd terminal mouth connects power end, CLK port meets CPU holds, DOUT port meets CPU holds, CS port meets CPU that the IN+ port of AD conversion chip U7 connects circuit-under-test plate hold; The VREF that the VSS port earth terminal of voltage reference U4, Vout port meet electric capacity C6 and U7 holds, Vin port meets electric capacity C8 and resistance R8; The Vout of electric capacity C6 mono-termination U4 holds and the VREF end of U7, the other end earth terminal of electric capacity C6; Electric capacity C8 mono-termination U4 Vin end and resistance R8, electric capacity C8 other end earth terminal; The vdd terminal of another termination U7 of the Vin end of resistance R8 mono-termination U4 and electric capacity C8, resistance R8 and power end; AD conversion chip U9 peripheral circuits connects with AD conversion chip U7 peripheral circuits.
Preferably, the Vin port of DC-DC isolating chip U3 connects inductance L 1, GND port meets electric capacity C4 and tester primary power hold ,+Vo port connects AD conversion chip power end and electric capacity C5,0V port is held with connecing electric capacity C5 and AD conversion chip power supply; The Vin port of inductance L 1 one termination U3, the other end connecting test instrument primary power end of inductance L 1 and electric capacity C4; Electric capacity C4 mono-termination tester primary power end and inductance L 1, the other end connecting test instrument primary power ground end of electric capacity C4 and the GND port of U3; Electric capacity C5 is connected in parallel on+Vo port and the 0V port two ends of U3.
More preferably, the quiescent current sampled voltage end that the carrier module power end that the CH0 port of AD conversion chip U11 connects the CPU module power end of circuit-under-test plate, CH1 port connects circuit-under-test plate, CH2 port connect the primary power end of circuit-under-test plate, CH3 port connects circuit-under-test plate, AGND port is held with connecing the primary power of circuit-under-test plate, DGND port connects A/D chip power supply holds, the I/O mouth PA6 of CLK port CPU holds, the I/O mouth PA7 of DOUT port CPU holds, the I/O mouth PF0 of DIN port CPU holds, the I/O mouth PF1 of CS port CPU holds; The VREF that VSS port is held with connecing AD conversion chip power supply, Vout port meets electric capacity C12 and U11 of voltage reference U10 holds, Vin port meets electric capacity C13 and resistance R24; The Vout of electric capacity C12 mono-termination U10 holds and the VREF end of U11, another termination AD conversion chip power supply ground end of electric capacity C12; Another termination AD conversion chip power supply ground end of the Vin end of electric capacity C13 mono-termination U10 and resistance R24, electric capacity C13; The Vin end of resistance R24 mono-termination U10 and electric capacity C13, the vdd terminal of another termination U11 of resistance R24 and the power end of AD conversion chip.
According to a third aspect of the present invention, provide a kind of method using the circuit board automatic detection device of above-mentioned electric energy meter, it comprises the following steps:
The first step, completes parameter initialization (power-up initializing) after auto testing instrument powers on;
Second step, waited for for 3 seconds, and whether detection arranges button is pressed, if there is key to press, enter the pattern of setting, scanning button, judges key assignments, according to the qualified threshold range of different key assignments undated parameter, and be shown to liquid crystal display, be provided with and automatically exit the pattern of setting afterwards;
3rd step, presses without key or is provided with and automatically enter test pattern afterwards, and start to detect, first carry out AD conversion, next carries out 485 communication tests, then carries out infrared communication test;
According to test result and threshold range, 4th step, judges that whether circuit-under-test plate is qualified, and drive the display of 8 LED, and it is qualified to be all that green is, as a certain fault then shows redness;
5th step, terminates.
Beneficial effect: use this device, tester only needs the color of viewing lamp, and compared with observation digital display meter used at present, it is convenient, quick, accurate to use.The advantage be connected by ox head socket is mainly reflected in, and when needs detect other model electric energy meters, only need change needle-bar, and base can continue to use, and greatly reduces cost.
Accompanying drawing explanation
Fig. 1 is the mechanical construction drawing of the circuit board automatic detection device of electric energy meter;
Fig. 2 is the electrical structure block diagram of the circuit board automatic detection device of electric energy meter;
Fig. 3 is the AD conversion module schematic diagram of the circuit board automatic detection device of electric energy meter;
Fig. 4 is 485 communication module schematic diagrams of the circuit board automatic detection device of electric energy meter;
Fig. 5 is the infrared module schematic diagram of the circuit board automatic detection device of electric energy meter;
Fig. 6 is CPU and the LED display module schematic diagram of the circuit board automatic detection device of electric energy meter;
Fig. 7 is the program flow diagram of the circuit board automatic detection device of electric energy meter.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.Additionally, protection scope of the present invention only should be limited to following concrete structure or parts or design parameter.
The technical solution used in the present invention is a kind of circuit board automatic detection device of electric energy meter, and comprise needle-bar and base, needle-bar is connected with base by motion bar.Needle-bar is distributed with 16 probes, 2 one group difference detection circuit plate Live line Zero line, main power voltage, CPU module supply voltage, metering module supply voltage, 485 modular power source voltages, carrier module supply voltage, quiescent current, 485 communication interfaces, needle-bar is provided with infrared communication module directly over corresponding liquid crystal display.Each root probe is connected with the ox head socket on base by winding displacement with infrared receiving/transmission Guan Jun.
Base comprises shift knob, ox head socket, pilot lamp, circuit board.8 dual-colored LED pilot lamp are provided with above base, indicate the state of main power voltage, CPU module supply voltage, metering module supply voltage, 485 modular power source voltages, carrier module supply voltage, quiescent current, 485 communications, infrared communication respectively, red expression fault, green expression is normal.Chassis interior mounting circuit boards, be made up of single-chip minimum system, sample circuit, communication test circuit, power circuit, sample circuit gathers tested ammeter modules voltage, and be input to microprocessor A/D port, transformation result and setting value contrast by microprocessor, judge whether voltage exists fault, and control the display of corresponding pilot lamp.Communication test circuit sends meter reading order by 485 and infrared communications ports, according to the message received, microprocessor judges whether communication line exists fault, and controls the display of corresponding pilot lamp.Circuit board is connected with ox head socket, and is connected with probe further, so just the check point of circuit-under-test plate can be introduced single-chip microcomputer respective pins by wire, collection and the monitoring communicated of settling signal.
With reference to accompanying drawing 1, specifically provide the mechanical construction drawing of the circuit board automatic detection device of electric energy meter, comprise switch 101, base 102, LED light 103, infrared communication module 104, needle-bar 105, buckle 106, probe 107, winding displacement 108, motion bar 109 and ox head socket 110.Wherein needle-bar 105 is distributed with 16 probes 107, probe 107 is one group of difference detection circuit plate Live line Zero line, main power voltage, CPU voltage, metered voltage, 485 module voltage, carrier module voltage, quiescent current, 485 communication interfaces between two; Needle-bar 105 is provided with infrared communication module 104 directly over corresponding tested electric energy meter circuit plate liquid crystal display; Each root probe 107 and infrared communication module all realize being electrically connected with the main circuit board in base 102 by winding displacement 108 and the ox head socket 110 on base 102.There is shift knob 101 in base 102 front, there is ox head socket 110 in left side, there are 8 LED light 103 on right side, middle room is for placing tested electric energy meter circuit plate.Needle-bar 105 is connected with base 102 by motion bar 109, needle-bar 105 can rotate within the scope of 0-180 degree, during detection, first upwards lift needle-bar 102, tested electric energy meter circuit plate is put into the room in the middle of base 102, then downward pressing bed 102, buckle 106 on needle-bar 102 is clamped with base, probe 107 is fully contacted with circuit-under-test plate, finally opens shift knob, start to detect.
With reference to accompanying drawing 2, provide the electrical structure block diagram of the auto testing instrument of intelligent electric meter production line further, auto testing instrument comprises CPU module, AD conversion module, 485 communication modules, infrared communication module, LCD MODULE, LED display module, arranges key-press module.Wherein CPU module is the core of whole system, controls whole testing process, carries out mathematics and logical operation, judges testing result.The voltage of circuit-under-test plate, current signal are converted to digital signal by AD conversion module, are input to CPU and carry out computing, and can realize electrical isolation, protection CPU module.485 communication modules and infrared communication module detect 485 and infrared communication function of circuit-under-test plate respectively.LCD MODULE and key-press module is set for arranging qualified threshold range.LED display module is for showing testing result, and green is qualified, and redness is defective.
With reference to accompanying drawing 3, provide the auto testing instrument AD conversion module schematic diagram of intelligent electric meter production line further, AD conversion module comprises two single channel AD conversion chip U7 and U9, a four-way AD conversion chip U11 and DC-DC isolating chip U3.AD conversion chip U7 is for changing 485 modular power source voltages and realizing electrical isolation, AD conversion chip U9 is for changing metering module supply voltage and realizing electrical isolation, AD conversion chip U11 is for changing CPU module supply voltage, carrier module supply voltage, main power voltage, current sample voltage realize electrical isolation, and DC-DC isolating chip U3 is that three AD conversion chip are powered and achieve the electrical isolation of auto testing instrument primary power and AD conversion chip supply voltage.The 485 I/O mouth PA2 that the I/O mouth PA1 that the I/O mouth PA0 that modular power source end V485+, IN-port holds V485-, VSS port earth terminal with connecing 485 modules of circuit-under-test plate, vdd terminal mouth connects power end, CLK port meets CPU holds, DOUT port meets CPU holds, CS port meets CPU that the IN+ port of AD conversion chip U7 connects circuit-under-test plate hold; The VREF that the VSS port earth terminal of voltage reference U4, Vout port meet electric capacity C6 and U7 holds, Vin port meets electric capacity C8 and resistance R8; The Vout of electric capacity C6 mono-termination U4 holds and the VREF end of U7, the other end earth terminal of electric capacity C6; Electric capacity C8 mono-termination U4 Vin end and resistance R8, electric capacity C8 other end earth terminal; The vdd terminal of another termination U7 of the Vin end of resistance R8 mono-termination U4 and electric capacity C8, resistance R8 and power end.AD conversion chip U9 peripheral circuits connects with AD conversion chip U7 peripheral circuits (see Fig. 3).
The Vin port of DC-DC isolating chip U3 connects inductance L 1, GND port meets electric capacity C4 and tester primary power hold ,+Vo port connects AD conversion chip power end and electric capacity C5,0V port is held with connecing electric capacity C5 and AD conversion chip power supply; The Vin port of inductance L 1 one termination U3, the other end connecting test instrument primary power end of inductance L 1 and electric capacity C4; Electric capacity C4 mono-termination tester primary power end and inductance L 1, the other end connecting test instrument primary power ground end of electric capacity C4 and the GND port of U3; Electric capacity C5 is connected in parallel on+Vo port and the 0V port two ends of U3.
The CH0 port of AD conversion chip U11 connects the CPU module power end of circuit-under-test plate, CH1 port connects the carrier module power end of circuit-under-test plate, CH2 port connects the primary power end of circuit-under-test plate, CH3 port connects the quiescent current sampled voltage end of circuit-under-test plate, AGND port is held with connecing the primary power of circuit-under-test plate, DGND port is held with connecing A/D chip power supply, the I/O mouth PA6 of CLK port CPU holds, the I/O mouth PA7 of DOUT port CPU holds, the I/O mouth PF0 of DIN port CPU holds, the I/O mouth PF1 of CS port CPU holds, the VREF that VSS port is held with connecing AD conversion chip power supply, Vout port meets electric capacity C12 and U11 of voltage reference U10 holds, Vin port meets electric capacity C13 and resistance R24, the Vout of electric capacity C12 mono-termination U10 holds and the VREF end of U11, another termination AD conversion chip power supply ground end of electric capacity C12, another termination AD conversion chip power supply ground end of the Vin end of electric capacity C13 mono-termination U10 and resistance R24, electric capacity C13, the Vin end of resistance R24 mono-termination U10 and electric capacity C13, the vdd terminal of another termination U11 of resistance R24 and the power end of AD conversion chip.
With reference to accompanying drawing 4, provide the auto testing instrument 485 communication module schematic diagram of intelligent electric meter production line further, light-coupled isolation chip OP1 inputs a terminating resistor R6, inputs the R port of another termination 485 chip U5; Light-coupled isolation chip OP1 export terminating resistor R5 and CPU RXD1 end, export the other end hold; The output of another termination light-coupled isolation chip OP1 of resistance R5 mono-termination cpu power end VCC, resistance R5; The input of another termination light-coupled isolation chip OP1 of resistance R6 mono-termination 485 power end, resistance R6; Light-coupled isolation chip OP2 inputs a termination cpu power end VCC, input other end connecting resistance R9; Light-coupled isolation chip OP2 exports termination 485 power end, exports RE, DE port of other end connecting resistance R10 and 485 chip U5; The control port CTL of the one termination CPU of resistance R9, the input of another termination light-coupled isolation chip OP2; The output of resistance R10 mono-termination light-coupled isolation chip OP2 and RE, DE port of 485 chip U5, another termination 485 module ground end of resistance R10; Light-coupled isolation chip OP3 inputs a termination cpu power end VCC, input other end connecting resistance R134; Light-coupled isolation chip OP3 exports the D port of a terminating resistor R12 and 485 chip U5, holds to another termination 485 module of light-coupled isolation chip OP3 output; The TXD1 port of the one termination CPU of resistance R14, the input of another termination light-coupled isolation chip OP3; The output of resistance R12 mono-termination light-coupled isolation chip OP3 and the D port of 485 chip U5, another termination 485 power end of resistance R12; The VCC port of electric capacity C7 mono-termination 485 modular power source end and 485 chip U5, another termination 485 modular power source ground end of electric capacity C7; The A port of another termination 485 chip U5 of resistance R7 mono-termination 485 modular power source end and electric capacity C7, resistance R7 and transient voltage suppressor TVS1; Another termination 485 bus B port of thermistor PTC1 mono-termination transient voltage suppressor TVS1 and resistance R11, thermistor PTC1; The other end connecting resistance R7 of transient voltage suppressor TVS1 mono-termination thermistor PTC1, transient voltage suppressor TVS1 and 485 bus A ports; The GND port of another termination 485 chip U5 of the B port of resistance R11 mono-termination 485 chip U5 and electric capacity thermistor PTC1, resistance R11 and 485 modular power sources ground end.
With reference to accompanying drawing 5, provide the auto testing instrument infrared communication module schematic diagram of intelligent electric meter production line further, the VOUT port of infrared receiving tube U1 meets the RXD2 end of CPU and resistance R2, VCC terminating resistor R1 and electric capacity C2, GND port earth terminal and electric capacity C2; Resistance R2 is connected in parallel between the VOUT port of power end VCC and U1; Electric capacity C3 be connected in parallel on U1 VOUT port and ground hold between; Resistance R2 is connected in parallel between the VCC port of power end VCC and U1; Electric capacity C1 be connected in parallel on power end and ground hold between; Electric capacity C2 is connected in parallel between the VCC port of U1 and the GND port of U1.
The base stage connecting resistance R4 of triode Q1, grounded emitter end, collector connect the negative electrode of infrared transmitting tube U2; The base stage of the TXD2 port of resistance R4 mono-termination CPU, the other end connecting triode Q1 of resistance R4; Resistant series is between power end and the anode of infrared transmitting tube U2; Infrared transmitting tube is connected between the collector of resistance R3 and triode Q1.
With reference to accompanying drawing 6, provide CPU and the LED display module schematic diagram of the auto testing instrument of intelligent electric meter production line further, wherein in CPU and minimum system circuit thereof, be composed in series reset circuit by resistance R13 and C10, VCC, AVCC port of resistance R13 mono-termination power end and CPU, the resistance R13 other end connect the RESET port of electric capacity C10 and CPU; AREF, GND port of the RESET port of electric capacity C10 mono-terminating resistor R13 and CPU, other end earth terminal and CPU.LED display circuit is made up of dual-colored LED lamp and resistant series, the I/O port PB mouth of LED one termination CPU, the I/O port PC mouth of resistance one termination CPU, and whether 8 same circuit indicate 8 parameters qualified respectively.
With reference to accompanying drawing 7, provide the program flow diagram of the auto testing instrument of intelligent electric meter production line further.
Step describes:
The first step, completes parameter initialization (power-up initializing) after auto testing instrument powers on.
Second step, waited for for 3 seconds, and whether detection arranges button is pressed, if there is key to press, enter the pattern of setting, scanning button, judges key assignments, according to the qualified threshold range of different key assignments undated parameter, and be shown to liquid crystal display, be provided with and automatically exit the pattern of setting afterwards.
3rd step, presses without key or is provided with and automatically enter test pattern afterwards, and start to detect, first carry out AD conversion, next carries out 485 communication tests, then carries out infrared communication test.
According to test result and threshold range, 4th step, judges that whether circuit-under-test plate is qualified, and drive the display of 8 LED, and it is qualified to be all that green is, as a certain fault then shows redness.
5th step, terminates.
The above; be only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.This area those skilled in the art are appreciated that when not deviating from the spirit and scope of the present invention of claims definition, can make various amendment in form and details.
Claims (9)
1. a circuit board automatic detection device for electric energy meter, it comprises needle-bar and base, and needle-bar is connected with base by motion bar; It is characterized in that,
Needle-bar is distributed with 16 probes, 2 one group difference detection circuit plate Live line Zero line, main power voltage, CPU module supply voltage, metering module supply voltage, 485 modular power source voltages, carrier module supply voltage, quiescent current, 485 communication interfaces, needle-bar is provided with infrared communication module directly over corresponding liquid crystal display; Each root probe is connected with the ox head socket on base by winding displacement with infrared receiving/transmission Guan Jun; Base comprises shift knob, ox head socket, pilot lamp, circuit board; 8 dual-colored LED pilot lamp are provided with above base, indicate the state of main power voltage, CPU module supply voltage, metering module supply voltage, 485 modular power source voltages, carrier module supply voltage, quiescent current, 485 communications, infrared communication respectively, red expression fault, green expression is normal.
2. according to the circuit board automatic detection device of electric energy meter according to claim 1, it is characterized in that, it comprises CPU module, AD conversion module, 485 communication modules, infrared communication module, LCD MODULE, LED display module, arranges key-press module; Wherein CPU module is the core of whole system, controls whole testing process, carries out mathematics and logical operation, judges testing result; The voltage of circuit-under-test plate, current signal are converted to digital signal by AD conversion module, are input to CPU and carry out computing, and can realize electrical isolation, protection CPU module; 485 communication modules and infrared communication module detect 485 and infrared communication function of circuit-under-test plate respectively; LCD MODULE and key-press module is set for arranging qualified threshold range; LED display module is for showing testing result, and green is qualified, and redness is defective.
3. according to the circuit board automatic detection device of electric energy meter according to claim 2, it is characterized in that, chassis interior mounting circuit boards, be made up of single-chip minimum system, sample circuit, communication test circuit, power circuit, sample circuit gathers tested ammeter modules voltage, and is input to microprocessor A/D port, and transformation result and setting value contrast by microprocessor, judge whether voltage exists fault, and control the display of corresponding pilot lamp; Communication test circuit sends meter reading order by 485 and infrared communications ports, according to the message received, microprocessor judges whether communication line exists fault, and controls the display of corresponding pilot lamp.
4. according to the circuit board automatic detection device of electric energy meter according to claim 2, it is characterized in that, circuit board is connected with ox head socket, and be connected with probe further, so just the check point of circuit-under-test plate can be introduced single-chip microcomputer respective pins by wire, collection and the monitoring communicated of settling signal.
5. according to the circuit board automatic detection device of electric energy meter according to claim 2, it is characterized in that, AD conversion module comprises two single channel AD conversion chip U7 and U9, a four-way AD conversion chip U11 and DC-DC isolating chip U3; AD conversion chip U7 is for changing 485 modular power source voltages and realizing electrical isolation, AD conversion chip U9 is for changing metering module supply voltage and realizing electrical isolation, and AD conversion chip U11 is for changing CPU module supply voltage, carrier module supply voltage, main power voltage, current sample voltage realize electrical isolation.
6. according to the circuit board automatic detection device of electric energy meter according to claim 2, it is characterized in that, DC-DC isolating chip U3 is that three AD conversion chip are powered and achieve the electrical isolation of auto testing instrument primary power and AD conversion chip supply voltage; The 485 I/O mouth PA2 that the I/O mouth PA1 that the I/O mouth PA0 that modular power source end V485+, IN-port holds V485-, VSS port earth terminal with connecing 485 modules of circuit-under-test plate, vdd terminal mouth connects power end, CLK port meets CPU holds, DOUT port meets CPU holds, CS port meets CPU that the IN+ port of AD conversion chip U7 connects circuit-under-test plate hold; The VREF that the VSS port earth terminal of voltage reference U4, Vout port meet electric capacity C6 and U7 holds, Vin port meets electric capacity C8 and resistance R8; The Vout of electric capacity C6 mono-termination U4 holds and the VREF end of U7, the other end earth terminal of electric capacity C6; Electric capacity C8 mono-termination U4 Vin end and resistance R8, electric capacity C8 other end earth terminal; The vdd terminal of another termination U7 of the Vin end of resistance R8 mono-termination U4 and electric capacity C8, resistance R8 and power end; AD conversion chip U9 peripheral circuits connects with AD conversion chip U7 peripheral circuits.
7. according to the circuit board automatic detection device of electric energy meter according to claim 2, it is characterized in that, the Vin port of DC-DC isolating chip U3 connects inductance L 1, GND port meets electric capacity C4 and tester primary power hold ,+Vo port connects AD conversion chip power end and electric capacity C5,0V port is held with connecing electric capacity C5 and AD conversion chip power supply; The Vin port of inductance L 1 one termination U3, the other end connecting test instrument primary power end of inductance L 1 and electric capacity C4; Electric capacity C4 mono-termination tester primary power end and inductance L 1, the other end connecting test instrument primary power ground end of electric capacity C4 and the GND port of U3; Electric capacity C5 is connected in parallel on+Vo port and the 0V port two ends of U3.
8. according to the circuit board automatic detection device of electric energy meter according to claim 2, it is characterized in that, the CH0 port of AD conversion chip U11 connects the CPU module power end of circuit-under-test plate, CH1 port connects the carrier module power end of circuit-under-test plate, CH2 port connects the primary power end of circuit-under-test plate, CH3 port connects the quiescent current sampled voltage end of circuit-under-test plate, AGND port is held with connecing the primary power of circuit-under-test plate, DGND port is held with connecing A/D chip power supply, the I/O mouth PA6 of CLK port CPU holds, the I/O mouth PA7 of DOUT port CPU holds, the I/O mouth PF0 of DIN port CPU holds, the I/O mouth PF1 of CS port CPU holds, the VREF that VSS port is held with connecing AD conversion chip power supply, Vout port meets electric capacity C12 and U11 of voltage reference U10 holds, Vin port meets electric capacity C13 and resistance R24.
9. according to the circuit board automatic detection device of electric energy meter according to claim 2, it is characterized in that, the Vout of electric capacity C12 mono-termination U10 holds and the VREF end of U11, another termination AD conversion chip power supply ground end of electric capacity C12; Another termination AD conversion chip power supply ground end of the Vin end of electric capacity C13 mono-termination U10 and resistance R24, electric capacity C13; The Vin end of resistance R24 mono-termination U10 and electric capacity C13, the vdd terminal of another termination U11 of resistance R24 and the power end of AD conversion chip.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106856639A (en) * | 2015-12-09 | 2017-06-16 | 惠州市物联微电子有限公司 | A kind of intelligent switch of remote detection switch motion |
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| CN112946452A (en) * | 2019-12-11 | 2021-06-11 | 中车时代电动汽车股份有限公司 | Testing device for circuit board |
| CN113219322A (en) * | 2021-04-23 | 2021-08-06 | 格力电器（武汉）有限公司 | Display panel detection method based on PLC |
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| CN106856639A (en) * | 2015-12-09 | 2017-06-16 | 惠州市物联微电子有限公司 | A kind of intelligent switch of remote detection switch motion |
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| CN113219322A (en) * | 2021-04-23 | 2021-08-06 | 格力电器（武汉）有限公司 | Display panel detection method based on PLC |
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