CN102901906B - A kind of detection system based on universal product plug and method - Google Patents
A kind of detection system based on universal product plug and method Download PDFInfo
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- CN102901906B CN102901906B CN201210326580.4A CN201210326580A CN102901906B CN 102901906 B CN102901906 B CN 102901906B CN 201210326580 A CN201210326580 A CN 201210326580A CN 102901906 B CN102901906 B CN 102901906B
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Abstract
The invention provides a kind of based on universal product plug short circuit detecting system and method, system comprises power supply, main control unit, power control unit (comprising PMOS), AC power supplies Port detecting circuit (comprising R1, R2, R3 and R4 of electric capacity, series connection).Another termination R3 of one end ground connection of drain electrode another termination R2, the R4 of the one termination PMOS of R1; The I/O port that the source electrode of PMOS connects power supply, grid connects main control unit; Another I/O port of main control unit is connected to the D point between R1 and R2 through an electric capacity, and an A/D port is connected to the D point between R1 and R2, and the 2nd A/D port is connected to the E point between R2 and R3, and the 3rd A/D port is connected to the F point between R3 and R4; D point, E point, F point are also held with the L of AC socket respectively, G holds, N holds and is connected.Main control unit is used for controlling its I/O port, to have judged whether that plug inserts and plug whether short circuit.The present invention can effectively test plug short circuit, saves cost; Protection short circuit is on-the-spot, is convenient to slip-stick artist's analyze and solve problem.
Description
Technical field
The present invention relates to plug detection technique field, particularly relate to a kind of detection system based on universal product plug and method.
Background technology
At present, for the infringement avoiding short circuit to cause product, the plug short-circuit detecting of the universal product is even more important, and existing plug method for detecting short circuit has that detection speed is slow, cost is high, cannot the defect such as systematized management, be thus necessary to provide a kind of simple and effective solution.
Summary of the invention
The object of the present invention is to provide a kind of detection system based on universal product plug and method, realize simply, facilitate systematized management, fast universal product plug to insert detection and plug short-circuit detecting.
The object of the invention is to be achieved through the following technical solutions:
Based on a short circuit detecting system for universal product plug, comprising: power supply, main control unit, and the power control unit, storage unit, communication unit, the AC power supplies Port detecting circuit that are connected respectively with main control unit; Described main control unit is single-chip microcomputer or MCU;
Described power control unit comprises: PMOS; The grid of PMOS is connected with main control unit I/O port (1PIN), source electrode connects 3.3V power supply, the one end of the connecting resistance R1 that drains;
Described AC power supplies Port detecting circuit comprises: resistance R1, R2, R3 and R4 of connecting successively; Wherein, one end of resistance R1 connects the drain electrode of PMOS, the other end ground connection of resistance R4; Another I/O port (15PIN) of main control unit is connected to the D point between resistance R1 and R2 through an electric capacity, one A/D port (2PIN) is directly connected in the D point between resistance R1 and R2,2nd A/D port (3PIN) is connected to the E point between resistance R2 and R3,3rd A/D port (4PIN) is directly connected in the F point between resistance R3 and R4, and an A/D port (2PIN), the 2nd A/D port (3PIN), the 3rd A/D port (4PIN) are all that the AD of main control unit detects mouth;
Described D point is also held with the L of AC socket and is connected, and E point is also held with the G of AC socket and is connected, and F point is also held with the N of AC socket and is connected;
Described main control unit, first for after the 3.3V to the drain electrode of I/O port (1PIN) control cut-out PMOS, its another I/O port (15PIN) just starts to export square-wave signal, to obtain the square-wave voltage size of the F point of AC power supplies Port detecting circuit for foundation, judge whether that plug inserts; Judge to insert effectively, control its another I/O port (15PIN) again to stop exporting square-wave signal, then the control of I/O port (1PIN) connects PMOS drain electrode 3.3V, now with its obtain D point, E point, F point three voltage swing for according to judging plug whether short circuit.
Preferably, said system also comprises hummer, and this hummer is connected with main control unit, for abnormal alarm being detected.
Preferably, said system also comprises n LED, and described n >=1, is connected with main control unit, for showing testing result.
Preferably, the resistance of described R2, R3, R4 is identical, and resistance is in 4.7K to 200K scope; The value of described electric capacity is for being more than or equal to 1uF.
Preferably, described communication unit is specially USB, for being realized the communication of native system and host computer by CDC data-transmission mode, receives the instruction of host computer transmission and testing result is sent to host computer.
As mentioned above based on a detection method for the short circuit detecting system of universal product plug, comprising:
Detection system start energising, power supply normally works and exports 3.3V, after main control unit initialization, when the detection instruction receiving host computer,
Main control unit carries out plug and inserts detection: first control an one I/O port (1PIN) and export high level, powers to cut off PMOS drain electrode 3.3V; Again its another I/O port (15PIN) is set to output state and export 1Khz, dutycycle is the square-wave signal of 50%, passes through capacitive coupling; Finally its A/D port (2PIN), the 2nd A/D port (3PIN), the 3rd A/D port (4PIN) are set to AD and input detected state, only obtain the size waveforms of F point, if the voltage effective value of this F point is not less than 0.5V, then be determined with plug to insert, otherwise judge that plug does not insert;
After having detected that plug inserts, main control unit carries out plug short-circuit detecting: first control its another I/O port (15PIN) and stop 1Khz output services, I/O port (1PIN) output low level, effect recovers PMOS drain electrode 3.3V to power; Allow the voltage that an A/D port (2PIN) of main control unit obtains D point, the 2nd A/D port (3PIN) obtains E point, the 3rd A/D port (4PIN) obtains F point three, with the comparative result of the magnitude of voltage of 3 and respective normal value for according to judging plug whether short circuit.
Preferably, carry out plug at main control unit and insert in the process detected,
After a described main control unit control one I/O port (1PIN) exports high level, just start the size waveforms obtaining F point after postponing Preset Time, reason is the duration of charging solving RC circuit, avoids the metrical error of F point;
And in Preset Time, when the number of times that the voltage of continuous detecting F point is not less than 0.5V reaches preset times, be just determined with plug and insert, reason manually inserts plug to have shake loose contact, and its effect is stabilization, stable detection result.
Preferably, described Preset Time is set as 10ms, and described preset times is 25 times.Object eliminates the metrical error of main control unit self existence.
Preferably, the method for described judgement plug short circuit comprises further:
If the magnitude of voltage of D point is greater than the magnitude of voltage of E point, and the magnitude of voltage of E point is greater than the magnitude of voltage of F point, then judge that plug does not have short circuit, reason is that normal product input impedance is very high, >0.2M ohm, substantially be equivalent to open circuit, according to identical resistance in series R2, the balanced voltage divider principle of R3, R4, so the voltage of D point, E point, F point divides 3.3V voltage exactly equally;
If the magnitude of voltage of D point and E point is suitable, and the magnitude of voltage of F point is higher than its normal value, then judge that the L end of plug is with G terminal shortcircuit;
If the magnitude of voltage of D point, E point and F point three is suitable, then judge that the L end of plug is with N terminal shortcircuit;
If the magnitude of voltage of E point and F point is suitable, and the magnitude of voltage of F point is higher than its normal value, the magnitude of voltage of E point is lower than its normal value, then judge that the G end of plug is with N terminal shortcircuit;
The range of normal value of the voltage of described D point, E point, F point is respectively: 2.8V ~ 3.3V, 1.6V ~ 2.8V, 0.8V ~ 1.6V, the object of such setting point is pressed with slight variation range at compatible universal plug impedance inconsistent causing, and the normal value of the voltage of 3 meets the condition of D point >E point >F point.
Preferably, said method also comprises: testing result is sent to host computer by CDC data-transmission mode; Buzzer warning is controlled when plug short circuit being detected.
Compared with prior art, the embodiment of the present invention has following beneficial effect: can find product short circuit in advance, avoids short circuit to be energized and burns out machine, save cost; Protect short circuit scene to be convenient to slip-stick artist and analyze improvement problem, improve manufacturing process further.
Accompanying drawing explanation
Fig. 1 is the detection system structural drawing based on universal product plug in the embodiment of the present invention.
Fig. 2 is the equivalent circuit diagram when universal product does not insert AC socket in this inventive embodiments.
Circuit diagram when Fig. 3 is universal product insertion AC socket in this inventive embodiments.
Equivalent circuit diagram when Fig. 4 is universal product insertion AC socket in this inventive embodiments.
Fig. 5 is the detection method process flow diagram based on universal product plug in the embodiment of the present invention.
The oscillogram of F point when Fig. 6 is product insertion AC socket in the embodiment of the present invention.
Fig. 7 is the oscillogram of F point when product does not insert AC socket in the embodiment of the present invention.
Fig. 8 is that in the embodiment of the present invention, testing circuit does not add Energy control, the oscillogram of F point when directly powering.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Refer to Fig. 1, in the present embodiment, detection system comprises following ingredient:
1. power supply: for single-chip microcomputer and AC power supplies Port detecting circuit provide the supply voltage of 3.3V.
2. single-chip microcomputer (or MCU): be major control chip.
3. Flash: be connected with single-chip microcomputer, its type decides according to the size of program, temporarily reserves, and object preserves more jumbo program.
4. USB: be connected with single-chip microcomputer, for realizing the communication of native system and host computer, reception detects instruction and testing result is changed into USB normal data and is sent to host computer.
5. hummer: be connected with single-chip microcomputer, for detecting abnormal alarm.
6. LED: be connected with single-chip microcomputer, for showing testing result, the present embodiment comprises three, and complete bright expression detects by (PASS).
7. power control unit: single-chip microcomputer I/O port (1PIN) is connected with the grid of PMOS, for controlling the power supply of AC power supplies Port detecting circuit.
8. AC power supplies Port detecting circuit: the divider resistance R1 comprising PMOS and series connection, R2, R3, R4, the source electrode of PMOS is connected with the output terminal of power supply, grid (B point) is connected with an I/O port (1PIN) of single-chip microcomputer, drain electrode (C point) is connected with divider resistance R1, another I/O port (15PIN) of single-chip microcomputer is connected to (D point) between resistance R1 and R2 through an electric capacity, one A/D port (2PIN) of single-chip microcomputer is directly connected in (D point) between resistance R1 and R2, 2nd A/D port (3PIN) of single-chip microcomputer is directly connected in (E point) between resistance R2 and R3, 3rd A/D port (4PIN) of single-chip microcomputer is directly connected in (F point) between resistance R3 and R4.In the application, during R1 3.3V power supply direct-connected for the protection of master control IO, chip does not damage; R2, R3, R4 value is in 4.7K to 200K scope, and crucial emphasis is the value of these three resistance must be identical; The value of electric capacity is for being more than or equal to 1uF.In the present embodiment, the resistance of resistance R1, R2, R3, R4 is respectively 100 ohm, 20K, 20K, 20K, and the value of electric capacity is 1uF.
When applying, D point, E point, F point connect L end, G end, the N end of AC socket respectively, and to realize the detection of plug, this plug is a general purpose accessory, for the slotting universal product, are not the commercial power socket connecting 220V.The detection technique that application said system realizes universal product plug is divided into two parts: universal product plug inserts and detects and universal product plug short-circuit detecting.
Part I: universal product plug inserts and detects.
First start shooting energising, power supply normally works and exports 3.3V, and single-chip microcomputer starts initialization, and then USB receives test control signal.I/O port (1PIN) exports high level and B point voltage is 3.3V, and PMOS work ends, and the 3.3V of A point cannot power to C point, and namely testing circuit is not powered.Then another I/O port (15PIN) is set to output state and exports 1Khz, and dutycycle is the square-wave signal of 50%, is coupled by electric capacity 1uF.So D point is 3.3V frequency 1Khz dutycycle is the square-wave signal of 50%.One A/D port (2PIN), the 2nd A/D port (3PIN), the 3rd A/D port (4PIN) are set to AD and input detected state, and an A/D port (2PIN) and the 2nd A/D port (3PIN) single-chip microcomputer temporarily do not process.Only process the 3rd A/D port (4PIN) receives the waveform of two states:
The first, as shown in Figure 2, the size waveforms received with the 3rd A/D port (4PIN), gets effective value and is greater than 0.8V the equivalent electrical circuit when universal product does not insert AC socket, can greatly improve detection versatility like this.
When the universal product does not insert, AC socket is equivalent to open circuit, and an A/D port (2PIN), the 2nd A/D port (3PIN) input state do not affect testing circuit and ignore.
So F point will obtain the wave-shape amplitude of D point 1/3, and be 1Khz according to pure resistance voltage divider principle 4.7/ (4.7+4.7+4.7) * about 3.3=1V frequency, dutycycle is 50%.The effective value that multimeter is tested is at about 0.4V.Thus can as the judgment condition do not inserted, software value is less than 0.5V.
The second, the universal product insert AC socket time equivalent electrical circuit as shown in Figure 3 and Figure 4, the size waveforms received with the 3rd A/D port (4PIN).
When the universal product inserts, L end (live wire) of AC socket and N end (zero line), be equivalent to an electric capacity, reason is that the power input of the universal product has X2 safety electric capacity, civil power is polluted in filtering for own power source noise, and the input state of an A/D port (2PIN), the 2nd A/D port (3PIN) does not affect testing circuit and ignores.
D point and E point in theory, the resistance between E point and F point will be fallen by X2 capacitive bypass, and the present invention just utilizes electric capacity every the principle of straight-through friendship here, ignores RC discharge and recharge, and F point is by acquisition D point 100% waveform coupling amplitude.As the judgment condition inserted.
The principle of work of foregoing circuit, has had the differentiation of wave-shape amplitude size, is just equal to the differentiation that the universal product inserts and do not insert, and adopts AD mouth to detect, satisfiable design requirement.
Part II: universal product plug short-circuit detecting.
After completing first step product insertion detection.Next, another I/O port (15PIN) stops 1Khz output services.I/O port (1PIN) output low level and B point voltage are 0V, PMOS conducting, and the 3.3V of A point source electrode will be transferred to drain electrode C point.Testing circuit will obtain DC partial voltage, then will consider the RC duration of charging in reality, and R is exactly the resistance sum of testing circuit, and C is exactly the safety capacitance size of universal product X2, is doing following judgement after needing to postpone several milliseconds:
D point voltage (4.7+4.7+4.7)/(4.7+4.7+4.7+0.1) * 3.3=3.2767V, an A/D port (2PIN) will detect.
More than theoretical value, in fact discharge and recharge cause and the metrical error of AD port, scope is at 2.8V to 3.3V.
E point voltage (4.7+4.7)/(4.7+4.7+4.7+0.1) * 3.3=2.1845V, the 2nd A/D port (3PIN) will detect.
More than theoretical value, in fact discharge and recharge cause and the metrical error of AD port, scope is at 1.6V to 2.8V.
F point voltage 4.7/ (4.7+4.7+4.7+0.1) * 3.3=1.0922V, the 3rd A/D port (4PIN) will detect.
More than theoretical value, in fact discharge and recharge cause and the metrical error of AD port, scope is at 0.8V to 1.6V.
Refer to Fig. 5, the method that application said detecting system realizes detecting comprises the following steps:
501, USB receives the instruction that host computer sends, and judges whether to detect AC socket, if so, performs next step.
502, device scan is carried out.
In this step, before device scan, need the I/O port (1PIN) controlling PMOS to draw high, then postpone 10ms, just start to utilize ADC to obtain the waveform of F point.Whether scanning device inserts, and is the waveform received by capturing F point, judge the waveform of F point be whether in the range of waveforms that receive when equipment inserts just.But in order to stabilization, avoid detecting a period of time the impact that then equipment is loosened by the plug of environment or socket, the present embodiment requires that being consecutively detected 25 secondary devices inserts, just real the inserting of calculation equipment, whether scanning device inserts each time needs 10 cycles of continuous detecting, at least will detect that 8 high level are just calculated primary equipment and inserted.
503, after detecting that equipment inserts, plug short-circuit detecting is carried out.
In this step, before device scan, need the I/O port (1PIN) controlling PMOS to drag down, then postpone 10ms, just start to utilize ADC to obtain the waveform of F point.It is judge plug whether short circuit according to the voltage of D point, E point, F point three points that plug detects, and if the L on fruit product plug is with G short circuit, then D point can be caused with the voltage height about the same of E point, and the voltage of F point can be higher than normal condition; If L with N short circuit, then can cause the voltage height about the same of D point, E point and F point three points; If G and N short circuit, then there will be the voltage height about the same of E point and F point, and F point voltage is higher than normal condition, E point voltage is lower than normal condition.
504, communicate with host computer, testing result is sent to host computer: the mode utilizing USB to turn serial ports realizes communicating with host computer, what USB transmission mode was here chosen is CDC data-transmission mode, and this is because required transmitted data amount is little.
In the present invention, must overcome the impact of testing circuit switch discharge and recharge on D, E, F current potential and cause erroneous judgement, after powering on, it is that 20K+20K+20K, C equal X2*1uF/ (X2+1uF) that time delay detects T=RC, R.In order to ensure D, the absolute stability of E, F current potential, the value of T, much larger than RC, is less than 500mS, affects detection efficiency too greatly.In order to overcome the abnormal problem of 1Khz signal coupling, in resistance detecting circuit, add power control system.
To the test data of some oscilloscope displays be provided below: product insert after, testing circuit is not powered, the waveform of F point as shown in Figure 6, normally; Product does not insert, and testing circuit is not powered, the waveform of F point as shown in Figure 7, normally; Testing circuit does not add Energy control, directly powers, and the Wave data of F point is as shown in Figure 8, abnormal.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. based on a short circuit detecting system for universal product plug, it is characterized in that, this system comprises: power supply, main control unit, and the power control unit, storage unit, communication unit, the AC power supplies Port detecting circuit that are connected respectively with main control unit; Described main control unit is single-chip microcomputer or MCU;
Described power control unit comprises: PMOS; The grid of PMOS is connected with main control unit I/O port, source electrode connects 3.3V power supply, the one end of the connecting resistance R1 that drains;
Described AC power supplies Port detecting circuit comprises: resistance R1, R2, R3 and R4 of connecting successively; Wherein, one end of resistance R1 connects the drain electrode of PMOS, the other end ground connection of resistance R4; Another I/O port of main control unit is connected to the D point between resistance R1 and R2 through an electric capacity, one A/D port is directly connected in the D point between resistance R1 and R2,2nd A/D port is connected to the E point between resistance R2 and R3,3rd A/D port is directly connected in the F point between resistance R3 and R4, and an A/D port, the 2nd A/D port, the 3rd A/D port are all that the AD of main control unit detects mouth;
Described D point is also held with the L of AC socket and is connected, and E point is also held with the G of AC socket and is connected, and F point is also held with the N of AC socket and is connected;
Described main control unit, first for after the 3.3V to the drain electrode of an I/O port controlling cut-out PMOS, its another I/O port just starts to export square-wave signal, to obtain the square-wave voltage size of the F point of AC power supplies Port detecting circuit for foundation, has judged whether that plug inserts; Judge to insert effectively, then control its another I/O port and stop exporting square-wave signal, then an I/O port controlling connects PMOS drain electrode 3.3V, now with its obtain D point, E point, F point three voltage swing for according to judging plug whether short circuit.
2. as claimed in claim 1 based on the short circuit detecting system of universal product plug, it is characterized in that, this system also comprises hummer, and this hummer is connected with main control unit, for abnormal alarm being detected.
3. as claimed in claim 1 based on the short circuit detecting system of universal product plug, it is characterized in that, this system also comprises n LED, and described n >=1, is connected with main control unit, for showing testing result.
4., based on the short circuit detecting system of universal product plug as described in as arbitrary in claims 1 to 3, it is characterized in that, the resistance of described R2, R3, R4 is identical, and resistance is in 4.7K to 200K scope; The value of described electric capacity is for being more than or equal to 1uF.
5. based on the short circuit detecting system of universal product plug as described in as arbitrary in claims 1 to 3, it is characterized in that, described communication unit is specially USB, for being realized the communication of native system and host computer by CDC data-transmission mode, receive the instruction of host computer transmission and testing result is sent to host computer.
6., as claimed in claim 1 based on a detection method for the short circuit detecting system of universal product plug, it is characterized in that, the method comprises:
Detection system start energising, power supply normally works and exports 3.3V, after main control unit initialization, when the detection instruction receiving host computer,
Main control unit carries out plug and inserts detection: first control an one I/O port and export high level, powers to cut off PMOS drain electrode 3.3V; Again its another I/O port is set to output state and export 1Khz, dutycycle is the square-wave signal of 50%, passes through capacitive coupling; Finally its A/D port, the 2nd A/D port, the 3rd A/D port are set to AD and input detected state, only obtain the size waveforms of F point, if the voltage effective value of this F point is not less than 0.5V, is then determined with plug and inserts, otherwise judge that plug does not insert;
After having detected that plug inserts, main control unit has carried out plug short-circuit detecting: first control its another I/O port and stop 1Khz output services, an I/O port output low level, and effect recovers PMOS drain electrode 3.3V to power; Allow the voltage that an A/D port of main control unit obtains D point, the 2nd A/D port obtains E point, the 3rd A/D port obtains F point three, with the comparative result of the magnitude of voltage of 3 and respective normal value for foundation judges plug whether short circuit.
7. detection method as claimed in claim 6, is characterized in that, carries out plug insert in the process detected at main control unit,
Described main control unit just starts the size waveforms obtaining F point after postponing Preset Time after controlling an one I/O port output high level;
And in Preset Time, when the number of times that the voltage of continuous detecting F point is not less than 0.5V reaches preset times, be just determined with plug and insert.
8. detection method as claimed in claim 7, it is characterized in that, described Preset Time is set as 10ms, and described preset times is 25 times.
9. detection method as claimed in claim 6, it is characterized in that, the method for described judgement plug short circuit comprises further:
If the magnitude of voltage of D point is greater than the magnitude of voltage of E point, and the magnitude of voltage of E point is greater than the magnitude of voltage of F point, then judge that plug does not have short circuit;
If the magnitude of voltage of D point and E point is suitable, and the magnitude of voltage of F point is higher than its normal value, then judge that the L end of plug is with G terminal shortcircuit;
If the magnitude of voltage of D point, E point and F point three is suitable, then judge that the L end of plug is with N terminal shortcircuit;
If the magnitude of voltage of E point and F point is suitable, and the magnitude of voltage of F point is higher than its normal value, the magnitude of voltage of E point is lower than its normal value, then judge that the G end of plug is with N terminal shortcircuit;
The range of normal value of the voltage of described D point, E point, F point is respectively: 2.8V ~ 3.3V, 1.6V ~ 2.8V, 0.8V ~ 1.6V, and the normal value of the voltage of 3 meets the condition of D point >E point >F point.
10. detection method as described in as arbitrary in claim 6 to 9, it is characterized in that, the method also comprises: testing result is sent to host computer by CDC data-transmission mode; Buzzer warning is controlled when plug short circuit being detected.
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| CN201210326580.4A CN102901906B (en) | 2012-09-06 | 2012-09-06 | A kind of detection system based on universal product plug and method |
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| CN201210326580.4A CN102901906B (en) | 2012-09-06 | 2012-09-06 | A kind of detection system based on universal product plug and method |
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| CN105223880B (en) * | 2015-09-18 | 2018-01-12 | 航宇救生装备有限公司 | A kind of programme-control box net synchronization capability detection method and device |
| CN108828396A (en) * | 2018-08-21 | 2018-11-16 | 合肥维晶电器有限公司 | A kind of cubing for test plug convenient to use |
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| CN201654165U (en) * | 2010-03-31 | 2010-11-24 | 彩虹彩色显像管总厂 | Wiring detector of 220-volt three-hole power supply socket |
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| JP2006038707A (en) * | 2004-07-28 | 2006-02-09 | Tempearl Ind Co Ltd | Polarity checking device of plug socket with earth electrode |
| JP5205356B2 (en) * | 2009-10-09 | 2013-06-05 | 日立オートモティブシステムズ株式会社 | Power supply unit and contactor welding judgment method |
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| CN201654165U (en) * | 2010-03-31 | 2010-11-24 | 彩虹彩色显像管总厂 | Wiring detector of 220-volt three-hole power supply socket |
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