CN102901906A - Universal product plug-based detection system and method - Google Patents
Universal product plug-based detection system and method Download PDFInfo
- Publication number
- CN102901906A CN102901906A CN2012103265804A CN201210326580A CN102901906A CN 102901906 A CN102901906 A CN 102901906A CN 2012103265804 A CN2012103265804 A CN 2012103265804A CN 201210326580 A CN201210326580 A CN 201210326580A CN 102901906 A CN102901906 A CN 102901906A
- Authority
- CN
- China
- Prior art keywords
- point
- plug
- control unit
- voltage
- main control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention provides universal product plug-based detection system and method. The system comprises a power supply, a main control unit, a power control unit (comprising a PMOS (P-channel Metal Oxide Semiconductor) pipe) and an AC (Alternating Current) power port detection circuit (comprising a capacitor as well as serially connected R1-R4), wherein one end of the R1 is connected with the drain electrode of the PMOS pipe and the other end is connected with the R2; one end of the R4 is grounded and the other end thereof is connected with the R3; the source electrode of the PMOS pipe is connected with the power supply and the grid electrode thereof is connected with a 1 PIN of the main control unit; a 15 PIN of the main control unit is connected with a D point between the R1 and the R2 through the capacitor, a 2 PIN is also connected with the D point between the R1 and the R2, a 3 PIN is connected with an E point between the R2 and the R3 and a 4 PIN is connected with an F point between the R3 and the R4; the D, E and F points are respectively connected with an L end, a G end and an N end of an AC socket respectively; and the main control unit is used for controlling an IO port so as to judge whether a plug is inserted or whether the plug is short-circuited. According to the universal product plug-based detection system and method, the short circuit of the plugs can be effectively detected so that the cost can be saved; and the short circuit sites can be protected so that the engineers can analyze and solve the problems conveniently.
Description
Technical field
The present invention relates to plug detection technique field, relate in particular to a kind of detection system based on universal product plug and method.
Background technology
At present, be the infringement of avoiding short circuit that product is caused, plug short-circuit detecting to the universal product is even more important, and existing plug method for detecting short circuit has that detection speed is slow, cost is high, can't systematized management etc. defective, thereby be 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, make things convenient for systematized management, fast universal product plug insertion to detect and the plug short-circuit detecting.
The objective of the invention is to be achieved through the following technical solutions.
A kind of short circuit detecting system based on universal product plug comprises: power supply, main control unit, and the main control unit power control unit, storage unit, communication unit, the AC power supplies Port detecting circuit that connect respectively; Described main control unit is single-chip microcomputer or MCU;
Described power control unit comprises: the PMOS pipe; The grid of PMOS pipe is connected with the 1PIN of main control unit, source electrode connects the 3.3V power supply, the end of drain electrode connecting resistance R1;
Described AC power supplies Port detecting circuit comprises: the resistance R 1, R2, R3 and the R4 that connect successively; Wherein, the other end of resistance R 1 connects the drain electrode of PMOS pipe, the other end ground connection of resistance R 4; The 15PIN of main control unit is connected in D point between resistance R 1 and the R2 through an electric capacity, 2PIN is directly connected in the D point between resistance R 1 and the R2,3PIN is connected in the E point between resistance R 2 and the R3,4PIN is directly connected in the F point between resistance R 3 and the R4, and 2PIN, 3PIN, 4PIN are that the AD of main control unit detects mouth;
Described D point also is connected with the L end of AC socket, and the E point also is connected with the G end of AC socket, and the F point also is connected with the N end of AC socket;
Described main control unit is used for first 1PIN after the 3.3V of PMOS pipe drain electrode is cut off in control, and its 15PIN just begins to export square-wave signal, and the square-wave voltage size of order take the F that obtains AC power supplies Port detecting circuit has judged whether the plug insertion as foundation; After judge inserting effectively, control its 15PIN again and stop to export square-wave signal, then PMOS pipe drain electrode 3.3V is connected in 1PIN control, and press size as foundation to judge plug whether short circuit take its voltage dc that obtains three of D points, E point, F point this moment.
Preferably, said system also comprises hummer, and this hummer is connected with main control unit, for detection of arriving unusual alarm.
Preferably, said system also comprises n LED, and described n 〉=1 is connected with main control unit, is used for showing testing result.
Preferably, the resistance of described R2, R3, R4 is identical, and resistance is in 4.7K arrives the 200K scope; The value of described electric capacity is more than or equal to 1uF.
Preferably, described communication unit is specially USB, is used for realizing communicating by letter of native system and host computer by the CDC data-transmission mode, receives the instruction of host computer transmission and testing result is sent to host computer.
A kind of as mentioned above based on the detection method of the detection system of universal product plug, comprising:
Detection system start energising, power supply normal operation output 3.3V, after the main control unit initialization, when the detection instruction that receives host computer,
Main control unit carries out plug and inserts detection: control first its 1PIN output high level, power to cut off PMOS pipe drain electrode 3.3V; To be set to output state and output 1Khz, dutycycle be 50% square-wave signal to its 15PIN again, passes through capacitive coupling; Its 2PIN, 3PIN, 4PIN are set to AD input detected state at last, only obtain the size waveforms that F is ordered, if the voltage effective value that this F is ordered is not less than 0.5V, then is determined with plug and inserts, otherwise judge that plug does not insert;
After having detected the plug insertion, main control unit carries out the plug short-circuit detecting: control first its 15PIN and stop the 1Khz output services, and the 1PIN output low level, effect is to recover PMOS pipe drain electrode 3.3V power supply; Allow the 2PIN of main control unit obtain D point, 3PIN and obtain the voltage that E point, 4PIN obtain three of F points, take the comparative result of 3 magnitude of voltage and separately normal value as according to judging whether short circuit of plug.
Preferably, carry out plug at main control unit and insert in the process that detects,
Described main control unit postpones just to begin to obtain the size waveforms that F is ordered after the Preset Time after controlling its 1PIN output high level, and reason is the duration of charging that solves the RC circuit, the detection error of avoiding F to order;
And in Preset Time, when the number of times that the voltage that continuous detecting F is ordered is not less than 0.5V reaches preset times, just be determined with plug and insert, reason is manually to insert plug to have the shake loose contact, and its effect is anti-shake, stable detection result.
Preferably, described Preset Time is set as 10ms, and described preset times is 25 times.Purpose is to eliminate the detection error that main control unit self exists.
Preferably, the method for described judgement plug short circuit further comprises:
If the magnitude of voltage that the magnitude of voltage that D is ordered is ordered greater than E, and the magnitude of voltage that the magnitude of voltage that E is ordered is ordered greater than F, judge that then plug does not have short circuit, reason is that normal product input impedance is very high, 0.2M ohm, basic equivalence is open circuit, and according to identical resistance in series R2, R3, the balanced voltage divider principle of R4, D point, E point, the F voltage of ordering is divided 3.3V voltage exactly equally so;
If the magnitude of voltage that D point and E are ordered is suitable, and the magnitude of voltage that F is ordered is higher than its normal value, judges that then the L end of plug is with the G terminal shortcircuit;
If the magnitude of voltage that D point, E point and F point is suitable, judge that then the L end of plug is with the N terminal shortcircuit at three;
If the magnitude of voltage that E point and F are ordered is suitable, and the magnitude of voltage that F is ordered is higher than its normal value, and the magnitude of voltage that E is ordered is lower than its normal value, judges that then the G end of plug is with the N terminal shortcircuit;
The range of normal value of the voltage that described D point, E point, F are ordered is respectively: 2.8V ~ 3.3V, 1.6V ~ 2.8V, 0.8V ~ 1.6V, the purpose that arranges like this is inconsistent causing of compatible universal plug impedance minute to be pressed with slight variation range, and the normal value of 3 voltage satisfies the D point〉the E point〉the F condition of ordering.
Preferably, said method also comprises: testing result is sent to host computer by the CDC data-transmission mode; Control buzzer warning when detecting the plug short circuit.
Compared with prior art, the embodiment of the invention has following beneficial effect: can find in advance the product short circuit, avoid the short circuit energising to burn out machine, save cost; Protect the short circuit scene to be convenient to the slip-stick artist and analyze the improvement problem, further improve manufacturing process.
Description of drawings
Fig. 1 is based on the detection system structural drawing of universal product plug in the embodiment of the invention.
Fig. 2 is the equivalent circuit diagram the when universal product does not insert the AC socket in this inventive embodiments.
Fig. 3 is the circuit diagram the when universal product inserts the AC socket in this inventive embodiments.
Fig. 4 is the equivalent circuit diagram the when universal product inserts the AC socket in this inventive embodiments.
Fig. 5 is based on the detection method process flow diagram of universal product plug in the embodiment of the invention.
Fig. 6 is the oscillogram that F was ordered when product inserted the AC socket in the embodiment of the invention.
Fig. 7 is the oscillogram that F was ordered when product did not insert the AC socket in the embodiment of the invention.
Fig. 8 is that testing circuit does not add power supply control, the oscillogram that F is ordered when directly powering in the embodiment of the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, 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, is not intended to limit the present invention.
See also Fig. 1, detection system comprises following ingredient in the present embodiment.
1. power supply: the supply voltage that 3.3V is provided for single-chip microcomputer and AC power supplies Port detecting circuit.
2. single-chip microcomputer (perhaps MCU): be the major control chip.
3. Flash: link to each other with single-chip microcomputer, its type decides according to the size of program, the temporary transient reservation, and purpose is preserved more jumbo program.
4. USB: link to each other with single-chip microcomputer, be used for realizing communicating by letter of native system and host computer, receive the detection instruction and testing result is changed into the USB normal data and be sent to host computer.
5. hummer: link to each other with single-chip microcomputer, for detection of unusual alarm.
6. LED: link to each other with single-chip microcomputer, be used for showing testing result, comprise three in the present embodiment, complete bright expression detects by (PASS).
7. power control unit: single-chip microcomputer 1PIN links to each other with the grid of PMOS pipe, is used for the power supply of control AC power supplies Port detecting circuit.
8. AC power supplies Port detecting circuit: divider resistance R1, the R2, R3, the R4 that comprise PMOS pipe and series connection, the source electrode of PMOS pipe is connected with the output terminal of power supply, grid (B point) is connected, drains with the 1PIN of single-chip microcomputer, and (C point) is connected with divider resistance R1, the 15PIN of single-chip microcomputer is connected in (D point) between resistance R 1 and the R2 through an electric capacity, the 2PIN of single-chip microcomputer is directly connected in (D point) between resistance R 1 and the R2, the 3PIN of single-chip microcomputer is directly connected in (E point) between resistance R 2 and the R3, and the 4PIN of single-chip microcomputer is directly connected in (F point) between resistance R 3 and the R4.In application, R1 during for the protection of the direct-connected 3.3V power supply of master control IO chip do not damage; In the 200K scope, crucial emphasis is that the value of these three resistance must be identical at 4.7K for R2, R3, R4 value; The value of electric capacity is more than or equal to 1uF.In the present embodiment, the resistance of resistance R 1, R2, R3, R4 is respectively 100 ohm, 20K, 20K, 20K, and the value of electric capacity is 1uF.
When using, D point, E point, F point connect respectively L end, G end, the N end of AC socket, and to realize the detection of plug, this plug is a general purpose accessory, be used for inserting the universal product, and or not the commercial power socket that connects 220V.The detection technique of using said system realization universal product plug is divided into two parts: universal product plug inserts and detects and universal product plug short-circuit detecting.
First: universal product plug inserts and detects.
At first start energising, power supply normal operation output 3.3V, single-chip microcomputer starts initialization, and then USB receives test control signal.1PIN output high level is that the B point voltage is 3.3V, and the PMOS plumber ends, and the 3.3V that A is ordered can't power to the C point, and namely testing circuit is not powered.Then 15Pin is set to output state and output 1Khz, and dutycycle is 50% square-wave signal, is coupled by electric capacity 1uF.The D point is 50% square-wave signal for 3.3V frequency 1Khz dutycycle so.2Pin, 3PIN, 4PIN are set to AD input detected state, and 2PIN and 3PIN single-chip microcomputer are not temporarily processed.Only process the waveform that 4PIN receives two states.
Equivalent electrical circuit when the first, the universal product are not inserted the AC socket with the size waveforms that 4Pin receives, is got effective value and is got final product greater than 0.8V as shown in Figure 2, can greatly improve the detection versatility like this.
When the universal product did not insert, the equivalence of AC socket was open circuit, and 2PIN, 3PIN input state do not affect testing circuit and ignore.
F names a person for a particular job and obtains the wave-shape amplitude of D point 1/3 so, is 1Khz according to pure resistance voltage divider principle 4.7/ (4.7+4.7+4.7) * 3.3=1V left and right sides frequency, and dutycycle is 50%.The effective value that multimeter is tested is about 0.4V.Thereby can be used as the judgment condition of not inserting, the software value is less than 0.5V.
Equivalent electrical circuit when the second, the universal product insert the AC socket as shown in Figure 3 and Figure 4, the size waveforms that receives with 4Pin.
When the universal product inserts, the L end (live wire) of AC socket and N end (zero line), equivalence is an electric capacity, reason is that the power input of the universal product has X2 safety electric capacity, civil power is polluted in the filtering that is used for self power supply noise, and the input state of 2PIN, 3PIN does not affect testing circuit and ignores.
In theory D point and E point, the resistance between E point and the F point will be fallen by the X2 capacitive bypass, and the present invention just utilizes electric capacity every the straight-through principle of handing over here, ignores RC to discharge and recharge, F names a person for a particular job and obtains D point 100% waveform coupling amplitude.As the judgment condition of inserting.
The principle of work of foregoing circuit has had the differentiation of wave-shape amplitude size, just is equal to the differentiation that the universal product inserts and do not insert, and adopts the AD mouth to detect satisfiable design requirement.
Second portion: universal product plug short-circuit detecting.
After finishing first step product insertion detection.Next, 15Pin stops the 1Khz output services.The 1PIN output low level is that the B point voltage is 0V, and PMOS manages 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 the reality, and R is exactly the resistance sum of testing circuit, and C is exactly the safety capacitance size of universal product X2, do as judging 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, 2PIN will detect.
More than be theoretical value, in fact discharge and recharge detection error that cause and the AD port, scope arrives 3.3V at 2.8V.
E point voltage (4.7+4.7)/(4.7+4.7+4.7+0.1) * 3.3=2.1845V, 3PIN will detect.
More than be theoretical value, in fact discharge and recharge detection error that cause and the AD port, scope arrives 2.8V at 1.6V.
F point voltage 4.7/ (4.7+4.7+4.7+0.1) * 3.3=1.0922V, 4PIN will detect.
More than be theoretical value, in fact discharge and recharge detection error that cause and the AD port, scope arrives 1.6V at 0.8V.
See also Fig. 5, use said detecting system and realize that the method that detects may further comprise the steps.
501, USB receives the instruction that host computer sends, and judges whether to detect the AC socket, if carry out next step.
502, carry out device scan.
In this step, before device scan, need the 1PIN of control PMOS pipe is drawn high, then postpone 10ms, just begin to utilize ADC to obtain the waveform that F is ordered.Whether scanning device inserts, and is the waveform that receives by crawl F point, has judged in the range of waveforms whether waveform that F is ordered receive when equipment inserts just.But for anti-shake, avoided detecting for the moment the plug loosening impact that equipment then is subjected to environment or socket, present embodiment requires to be consecutively detected 25 secondary devices and inserts, the insertion that ability calculation equipment is real, whether scanning device inserts each time needs 10 cycles of continuous detecting, will detect at least 8 high level and just calculate the primary equipment insertion.
503, after the equipment that detects inserts, carry out the plug short-circuit detecting.
In this step, before device scan, need the 1PIN of control PMOS pipe is dragged down, then postpone 10ms, just begin to utilize ADC to obtain the waveform that F is ordered.It is to judge whether short circuit of plug according to the voltage of D point, E point, three points of F point that plug detects, such as the L on the fruit product plug with the G short circuit, the voltage height about the same that then can cause the D point to order with E, and the voltage that F is ordered can be than the normal condition height; If L with the N short circuit, then can cause the voltage height about the same of D point, E point and three points of F point; If G and N short circuit the voltage height about the same that E point and F are ordered then can occur, and the F point voltage are higher than normal condition, the E point voltage is lower than normal condition.
504, communicate by letter with host computer, testing result is sent to host computer: the mode of utilizing USB to turn serial ports realizes communicating by letter with host computer, and what the USB transmission mode was here chosen is the CDC data-transmission mode, and this is because required transmitted data amount is little.
Among the present invention, must overcome the impact that the testing circuit switch discharges and recharges D, E, F current potential and cause erroneous judgement, after powering on, time-delay detects T=RC, and R is 20K+20K+20K, and C equals X2*1uF/ (X2+1uF).In order to guarantee D, E, the absolute stability of F current potential, the value of T is much larger than RC, less than 500mS, the too large detection efficiency that affects.In order to overcome the abnormal problem of 1Khz signal coupling, in resistance detecting circuit, add power control system.
The below will provide the test data of some oscilloscope displays: after product inserted, testing circuit was not powered, and the waveform that F is ordered as shown in Figure 6, and is normal; Product does not insert, and testing circuit is not powered, and the waveform that F is ordered as shown in Figure 7, and is normal; Testing circuit does not add power supply control, directly power supply, and the Wave data that F is ordered is as shown in Figure 8, and is undesired.
The above only is preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the short circuit detecting system based on universal product plug is characterized in that, this system comprises: power supply, main control unit, and the main control unit power control unit, storage unit, communication unit, the AC power supplies Port detecting circuit that connect respectively; Described main control unit is single-chip microcomputer or MCU;
Described power control unit comprises: the PMOS pipe; The grid of PMOS pipe is connected with the 1PIN of main control unit, source electrode connects the 3.3V power supply, the end of drain electrode connecting resistance R1;
Described AC power supplies Port detecting circuit comprises: the resistance R 1, R2, R3 and the R4 that connect successively; Wherein, the other end of resistance R 1 connects the drain electrode of PMOS pipe, the other end ground connection of resistance R 4; The 15PIN of main control unit is connected in D point between resistance R 1 and the R2 through an electric capacity, 2PIN is directly connected in the D point between resistance R 1 and the R2,3PIN is connected in the E point between resistance R 2 and the R3,4PIN is directly connected in the F point between resistance R 3 and the R4, and 2PIN, 3PIN, 4PIN are that the AD of main control unit detects mouth;
Described D point also is connected with the L end of AC socket, and the E point also is connected with the G end of AC socket, and the F point also is connected with the N end of AC socket;
Described main control unit is used for first 1PIN after the 3.3V of PMOS pipe drain electrode is cut off in control, and its 15PIN just begins to export square-wave signal, and the square-wave voltage size of order take the F that obtains AC power supplies Port detecting circuit has judged whether the plug insertion as foundation; After judge inserting effectively, control its 15PIN again and stop to export square-wave signal, then PMOS pipe drain electrode 3.3V is connected in 1PIN control, and press size as foundation to judge plug whether short circuit take its voltage dc that obtains three of D points, E point, F point this moment.
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, this hummer is connected with main control unit, for detection of arriving unusual alarm.
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, described n 〉=1 is connected with main control unit, is used for showing testing result.
4. based on the short circuit detecting system of universal product plug, it is characterized in that the resistance of described R2, R3, R4 is identical as described in arbitrary such as claims 1 to 3, and resistance at 4.7K in the 200K scope; The value of described electric capacity is more than or equal to 1uF.
5. as described in arbitrary such as claims 1 to 3 based on the detection system of universal product plug, it is characterized in that, described communication unit is specially USB, is used for realizing communicating by letter of native system and host computer by the CDC data-transmission mode, receives the instruction of host computer transmission and testing result is sent to host computer.
6. one kind as claimed in claim 1 based on the detection method of the detection system of universal product plug, it is characterized in that the method comprises:
Detection system start energising, power supply normal operation output 3.3V, after the main control unit initialization, when the detection instruction that receives host computer,
Main control unit carries out plug and inserts detection: control first its 1PIN output high level, power to cut off PMOS pipe drain electrode 3.3V; To be set to output state and output 1Khz, dutycycle be 50% square-wave signal to its 15PIN again, passes through capacitive coupling; Its 2PIN, 3PIN, 4PIN are set to AD input detected state at last, only obtain the size waveforms that F is ordered, if the voltage effective value that this F is ordered is not less than 0.5V, then is determined with plug and inserts, otherwise judge that plug does not insert;
After having detected the plug insertion, main control unit carries out the plug short-circuit detecting: control first its 15PIN and stop the 1Khz output services, and the 1PIN output low level, effect is to recover PMOS pipe drain electrode 3.3V power supply; Allow the 2PIN of main control unit obtain D point, 3PIN and obtain the voltage that E point, 4PIN obtain three of F points, take the comparative result of 3 magnitude of voltage and separately normal value as according to judging whether short circuit of plug.
7. detection method as claimed in claim 6 is characterized in that, carry out plug at main control unit and insert in the process that detects,
Described main control unit postpones just to begin to obtain the size waveforms that F is ordered after the Preset Time after controlling its 1PIN output high level;
And in Preset Time, when the number of times that the voltage that continuous detecting F is ordered is not less than 0.5V reaches preset times, just be determined with plug and insert.
8. detection method as claimed in claim 7 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 is characterized in that the method for described judgement plug short circuit further comprises:
If the magnitude of voltage that the magnitude of voltage that D is ordered is ordered greater than E, and the E magnitude of voltage of the ordering magnitude of voltage of ordering greater than F judge that then plug does not have short circuit;
If the magnitude of voltage that D point and E are ordered is suitable, and the magnitude of voltage that F is ordered is higher than its normal value, judges that then the L end of plug is with the G terminal shortcircuit;
If the magnitude of voltage that D point, E point and F point is suitable, judge that then the L end of plug is with the N terminal shortcircuit at three;
If the magnitude of voltage that E point and F are ordered is suitable, and the magnitude of voltage that F is ordered is higher than its normal value, and the magnitude of voltage that E is ordered is lower than its normal value, judges that then the G end of plug is with the N terminal shortcircuit;
The range of normal value of the voltage that described D point, E point, F are ordered is respectively: 2.8V ~ 3.3V, 1.6V ~ 2.8V, 0.8V ~ 1.6V, and the normal value of 3 voltage satisfies the D point〉the E point〉the F condition of ordering.
10. detection method as described in arbitrary such as claim 6 to 9 is characterized in that the method also comprises: testing result is sent to host computer by the CDC data-transmission mode; Control buzzer warning when detecting the plug short circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210326580.4A CN102901906B (en) | 2012-09-06 | 2012-09-06 | A kind of detection system based on universal product plug and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210326580.4A CN102901906B (en) | 2012-09-06 | 2012-09-06 | A kind of detection system based on universal product plug and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102901906A true CN102901906A (en) | 2013-01-30 |
| CN102901906B CN102901906B (en) | 2015-08-05 |
Family
ID=47574252
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210326580.4A Expired - Fee Related CN102901906B (en) | 2012-09-06 | 2012-09-06 | A kind of detection system based on universal product plug and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102901906B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104180924A (en) * | 2013-05-21 | 2014-12-03 | 大连嘉特科技有限公司 | Small-volume wireless temperature measuring module powered by battery |
| CN105223880A (en) * | 2015-09-18 | 2016-01-06 | 航宇救生装备有限公司 | A kind of programmed 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 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006038707A (en) * | 2004-07-28 | 2006-02-09 | Tempearl Ind Co Ltd | Polarity checking device of plug socket with earth electrode |
| 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 |
| US20110084704A1 (en) * | 2009-10-09 | 2011-04-14 | Kohei Myoen | Power supply device and method for making decision as to contactor weld of power supply device |
-
2012
- 2012-09-06 CN CN201210326580.4A patent/CN102901906B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006038707A (en) * | 2004-07-28 | 2006-02-09 | Tempearl Ind Co Ltd | Polarity checking device of plug socket with earth electrode |
| US20110084704A1 (en) * | 2009-10-09 | 2011-04-14 | Kohei Myoen | Power supply device and method for making decision as to contactor weld of power supply device |
| 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 |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104180924A (en) * | 2013-05-21 | 2014-12-03 | 大连嘉特科技有限公司 | Small-volume wireless temperature measuring module powered by battery |
| CN105223880A (en) * | 2015-09-18 | 2016-01-06 | 航宇救生装备有限公司 | A kind of programmed control box net synchronization capability detection method and device |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102901906B (en) | 2015-08-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101860443B (en) | POE load detecting method and power supply terminal equipment | |
| CN102820682B (en) | A kind of communicated by USB interface and be external equipment charging device and method | |
| CN105826894B (en) | The charging short-circuit protection and power-supply device of power-supply device | |
| CN103545882A (en) | Battery in-situ test method and device and battery charge system | |
| CN205665378U (en) | Relay adhesion detection circuitry | |
| CN104267273B (en) | Quick detection circuit and method for mains fluctuation | |
| CN105676054B (en) | Cable reversal connection and short-circuit detecting circuit | |
| CN105866720A (en) | Fault simulation device for direct-current system | |
| CN105301478A (en) | Detection device and detection method of 3.7V cell single-string protection plate | |
| CN102901906A (en) | Universal product plug-based detection system and method | |
| CN101042413B (en) | Alternating current recognition device | |
| CN107317686A (en) | A kind of power supply unit PSE | |
| CN202798035U (en) | Charging mode detection circuit and mobile terminal | |
| CN205490598U (en) | Intellectual detection system POE power supply | |
| CN105305796A (en) | Frequency converter direct-current busbar overvoltage and under-voltage protection method and system | |
| CN107395175A (en) | A kind of metal-oxide-semiconductor current foldback circuit | |
| CN203800821U (en) | Power polarity protection circuit | |
| CN207117586U (en) | A kind of metal-oxide-semiconductor current foldback circuit | |
| CN207067304U (en) | A kind of ground connection of new-energy automobile AC charging device and wrong phase detecting circuit | |
| CN201490709U (en) | Anti-dead halt lightning arrester | |
| CN219718074U (en) | Communication gateway double-circuit USB Type-C power supply circuit | |
| CN205594145U (en) | USB input power type detection circuitry | |
| CN103345292B (en) | Based on the apparatus for protecting power supply that DVI interface is powered | |
| CN107632224A (en) | The ground connection of new-energy automobile AC charging device and wrong phase detecting circuit and its method | |
| CN110161450A (en) | A kind of power-fail detection circuit, communication module and ammeter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150805 Termination date: 20180906 |