CN103558495B - A kind of multi-channel circuit on-off detection device - Google Patents
A kind of multi-channel circuit on-off detection device Download PDFInfo
- Publication number
- CN103558495B CN103558495B CN201310555083.6A CN201310555083A CN103558495B CN 103558495 B CN103558495 B CN 103558495B CN 201310555083 A CN201310555083 A CN 201310555083A CN 103558495 B CN103558495 B CN 103558495B
- Authority
- CN
- China
- Prior art keywords
- circuit
- output terminal
- switch
- source
- input end
- 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.)
- Active
Links
Abstract
The invention discloses a kind of multi-channel circuit on-off detection device, control to select by the combination of multichannel analog selector switch and n alternative analog switch, can measure by electronic circuit between any i, j two links i, j, improve the dirigibility of detection.Simultaneously, if need to measure back resistance value, only need multichannel analog selector switch, a jth output terminal is selected to export, and ground connection input end selected by i-th alternative analog switch, other alternative analog switches all select the input end be connected with the output terminal of multichannel analog selector switch to realize.Use analog switch to do commutation circuit in the present invention extremely short for switching time, be usually less than 1 microsecond, in the sophisticated electronic product needing hyperchannel wireline inspection, the passage bridge time, this characteristic short was particularly important.In addition, structure of the present invention is mathematic interpolation, overcomes the impact of analog switch internal resistance on testing result.
Description
Technical field
The invention belongs to electronic circuit detection technique field, more specifically say, relate to a kind of multi-channel circuit on-off detection device.
Background technology
The electronic circuit of electronic product all becomes increasingly complex, and the short circuit of a large amount of electronic circuits in these sophisticated electronic products, open circuit detection are the emphasis of quality testing always.What require Quality of electronic products along with people improves constantly, and 100% full inspection of line short, open circuit has become the inexorable trend of electron trade quality testing link development.Break-make for electronic circuit detects, the most conventional mode is the two ends using multimeter measuring circuit, by whether sounding under the corresponding gear of multimeter or being judged the break-make situation of circuit by resistance value reading size, this detection method efficiency is low, and copies difficulty during multi-channel detection.Some circuit on-off detection device can carry out circuit on-off detection for the electronic circuit of a certain specific electronic product in addition, and these measuring methods almost do not have dirigibility to say.Also have a lot of device using relay to do hyperchannel switching, because the restriction of relay turn-on and turn-off time makes Measuring Time elongated, the electronic circuit break-make that these methods all can not meet most of sophisticated electronic product detects needs simultaneously.Therefore, design a kind ofly to have at a high speed, the multi-channel circuit on-off detection device of high flexibility is vital.
Break-make detection is carried out to electronic circuit, be exactly that the resistance value at circuit two ends is detected, threshold decision is carried out to the resistance value detected, it is open circuit that resistance is greater than certain threshold value, it is short circuit that resistance is less than certain threshold value, and pick-up unit mainly contains two kinds of methods: hardware threshold judges and software can set threshold decision.
Existing single channel circuit on-off detection technique mainly adopts following methods: measured resistance (electronic circuit) connected with the measuring resistance of known resistance, voltage-reference is used to add fixed voltage at these branch road two ends of measured resistance (electronic circuit) and known resistance series connection, resistance value size is calculated by the sample partial pressure value size of measured resistance (electronic circuit branch road) and known resistance of AD, and then by obtaining electronic circuit break-make information with comparing of respective threshold.In multi-channel circuit on-off detects, the normal midget relay that adopts does passage bridge.
In some cases, the forward resistance value of tested electronic circuit is not identical with back resistance value, existing break-make detection scheme can not control current direction after electronic circuit connects, so disposablely can not measure forward resistance value and the back resistance value of tested electronic circuit.
In the prior art, multi-channel circuit on-off detection scheme, after electronic circuit connects, can not accomplish the measurement between any two-way, not enough for dirigibility in the electronic circuit detection of the electronic product of complexity, often need again to be customized pick-up unit according to different by electronic product.
Existing employing relay does in the device of multi-channel detection switching, and the relay turn-on and turn-off time is longer, is generally several millisecond, makes Measuring Time longer.
Summary of the invention
The object of the invention is to overcome prior art deficiency, a kind of multi-channel circuit on-off detection device is provided, to realize the positive and negative resistance measurement of electronic circuit, while detection circuitry break-make, improve the dirigibility of detection efficiency and detection.
For realizing above object, multi-channel circuit on-off detection device of the present invention, comprising:
One constant current source, exports the DC current for detecting;
It is characterized in that, also comprise:
One multichannel analog selector switch, this switch has an input end and n output terminal, and input end is connected with constant current source, and the DC current that constant current source exports inputs from input end, then according to the selection of multichannel analog selector switch, a corresponding output terminal is outputted to;
N alternative analog switch, each either-or switch has two input ends and an output terminal, an input end in two input ends and an output terminal of multichannel analog switch, another input end grounding; Output terminal is connected with the electronic circuit link of multi-channel circuit on-off detection device; The input end that each alternative analog switch is connected with the output terminal of multichannel analog selector switch is connected with the output terminal of multichannel analog selector switch one by one:
With the data acquisition system (DAS) of computing power, this system comprises two channel selecting ports and a voltage sample interface; Wherein, one channel selecting port is for controlling multichannel analog selector switch, i-th output terminal is selected to export, another channel selecting port is then for controlling multiple alternative analog switch, a jth alternative analog switch is allowed to select ground connection input end, the input end be connected with the output terminal of multichannel analog selector switch all selected by other alternative analog switches, for detecting the electronic circuit between multi-channel circuit on-off detection device electronic circuit link i, j; Voltage sample interface comprises n sample port, is connected respectively to the output terminal of n alternative analog switch;
With computing power data acquisition system (DAS) first according to i-th, the voltage V that gathers of j sample port
i, V
jcarry out following calculating, obtain the resistance value RL of the electronic circuit be connected between link i, j
ij:
Wherein, I
afor the DC current that constant current source exports;
Then, by resistance value RL
ijcompare with the threshold value of inner setting, obtain the on off operating mode of the electronic circuit between link i, j.
The object of the present invention is achieved like this:
Multi-channel circuit on-off detection device of the present invention, controls to select by the combination of multichannel analog selector switch and n alternative analog switch, can measure, improve the dirigibility of detection to the electronic circuit between any i, j two links i, j.Simultaneously, if need to measure back resistance value, only need multichannel analog selector switch, a jth output terminal is selected to export, and ground connection input end selected by i-th alternative analog switch, other alternative analog switches all select the input end be connected with the output terminal of multichannel analog selector switch to realize.Use analog switch to do commutation circuit in the present invention extremely short for switching time, be usually less than 1 microsecond, in the sophisticated electronic product needing hyperchannel wireline inspection, the passage bridge time, this characteristic short was particularly important.In addition, the present invention adopts mathematic interpolation method, overcomes the impact of analog switch internal resistance on testing result.
Accompanying drawing explanation
Fig. 1 is a kind of embodiment schematic diagram of multi-channel circuit on-off detection device of the present invention;
Fig. 2 is the electronic circuit of multi-channel circuit on-off detection device shown in Fig. 1 measuring principle figure;
Fig. 3 is the electronic circuit of multi-channel circuit on-off detection device shown in Fig. 1 back resistance value measuring principle figure;
Fig. 4 is the schematic diagram of the analog switch of multi-channel circuit on-off detection device shown in Fig. 1 when all disconnecting;
Fig. 5 is the waveform example figure of multi-channel circuit on-off detection device shown in Fig. 1 when not having diode divided circuit;
Fig. 6 is the waveform example figure of multi-channel circuit on-off detection device shown in Fig. 1.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described, so that those skilled in the art understands the present invention better.Requiring particular attention is that, in the following description, when perhaps the detailed description of known function and design can desalinate main contents of the present invention, these are described in and will be left in the basket here.
In the present embodiment; as shown in Figure 1, multi-channel circuit on-off detection device of the present invention comprises constant current source 1, multichannel analog selector switch 2, a n alternative analog switch 3, data acquisition system (DAS) 4 with computing power, DCDC insulating power supply 5 and interface protective circuit 6.Disposable connect electronic circuit after, the short circuit between any two links and open circuit detection can be realized, and measure while forward and back resistance can being realized by control current direction, measurement result can precise quantification, when there is short circuit and open circuit fault in measured object, this device can localizing faults to concrete electronic circuit.
The present invention is by Single Chip Microcomputer (SCM) system or other data acquisition system (DAS) 4 with computing power, by analog switch channel selecting port, control multichannel analog selector switch 2 and n alternative analog switch 3 and tested electronic product respective electronics and form current return.After loop is formed, DC current is from the positive VCC1 of internal electric source through adjustable constant current source 1, multichannel analog selector switch 2 and n alternative analog switch 3, flowed back to internal electrical seedbed end GND by after electronic product respective electronics, a n alternative analog switch 3.After DC current is stable, voltage sample interface from the voltage sample point of respective channel that is i-th, j sample port gathers voltage, according to magnitude of voltage and the known current value of sampling, corresponding tested electronic circuit resistance value size is calculated by voltammetry, the electronic circuit resistance value size recorded is compared with the respective threshold set in software, obtains the on off operating mode of the electronic circuit between link i, j.Be off while disconnecting (detect) to be less than short-circuit threshold value be that while connecting (detect) is connected in short circuit as being greater than cutout threshold.The resistance value of calculating and the state of detection are reached display device by communication interface or directly by other man-machine interaction mode expressing information.
In the present embodiment, the present invention is powered by external power source anode+Vout and external power source negative terminal OUTGND, is converted to internal electric source through DCDC insulating power supply 5, i.e. anode+Vin and negative terminal GND.Internal electric source anode is converted to the positive VCC1 of internal electric source and positive two VCC2 of internal electric source through source of stable pressure or power level change-over circuit.Multi-channel circuit on-off detection device power supply ground level of the present invention and external power source ground thoroughly isolate, and avoid the loop between Air conduct measurement electric current and Power supply to disturb.
Multi-channel circuit on-off detection device of the present invention is connected with tested electronic circuit, as shown in Figure 2, link 1 i.e. i=1, link 15 that is between j=15 the equivalent load resistance of electronic circuit and the resistance value of electronic circuit be RL
1-15, system starts equivalent load resistance RL
1-15measure.
First control multichannel analog selector switch the 2 and the 1st, 15 alternative analog switches are arranged according to shown in Fig. 2, other all alternative analog switch equally connects to the 16th alternative analog switch, now current return 7 shown in pie graph 2, other loops 8 as shown in Figure 2 do not have ground connection due to alternative analog switch 16, cannot form current return.Because there is the DC current I that constant current source and course goes out
apass through from this current return 7, so the voltage of the 1st alternative analoging switch output end is V
1=(r
oN+ RL
1-15) × I
a, r
oNfor the conducting internal resistance of alternative analog switch, the voltage of the 15th alternative analoging switch output end is:
V
15＝r
ON×I
a,
So
Can be found out by above-mentioned formula, 1: by regulating the DC current I in controllable constant-current source 1
a, tested electronic circuit resistance value scope can be regulated; 2, r
oNexistence do not affect the accurate measurement of the resistance value of electronic circuit, namely there is uncertain internal resistance to measurement result without impact in analog switch.Same, as shown in Figure 3, form current return 9, this current return 9 is identical with current return 7 for control simulation switch, and just direction of current is contrary, and the resistance value calculation method of equivalent electron circuit is the same to be described, and calculates RL
15-1.
Like this, as shown in Figure 2,3, cut multichannel analog selector switch 2 and n alternative analog switch 3, the resistance measurement of the tested electronic circuit of any two-way can be realized.
As shown in Figure 4, multi-channel circuit on-off detection device of the present invention also comprises diode divided circuit 120, and its anode is connected with constant current source 1 DC current output terminal, and negative terminal is connected with positive two VCC2 of internal electric source, and the positive VCC1 of internal electric source is that constant current source 1 is powered.
Control whole analog switch multichannel analog selector switch 2, a n alternative analog switch 3 i.e. control simulation switch is in not enabled state, constant current source 1 exports DC current I
adiode divided circuit 120 can be flowed to, this branch road has vital role for the high speed switching between passage, if remove this circuit 120, the situation first cutting off all current returns can be there is before passage bridge, now tabilized current power supply 1 quits work, after completing passage bridge, new current return is formed, tabilized current power supply 1 restarts work, because there is start-up time in constant current source 1, so need to wait for that constant current source 1 just can carry out voltage sample after stable with the data acquisition system (DAS) 4 of computing power, reduce system operating frequency.During diode-less divided circuit 120, the current stabilization time as shown in Figure 5, after analog switch is enable, after namely new current return completes, needs to wait for that 15us after-current is just stable.Wherein, waveform 135 is alternative analog switch i output end voltage waveform, and waveform 136 is the corresponding channel selecting port signal waveform of alternative analog switch i output terminal.When having diode divided circuit, even if analog switch all disconnects, electric current still can flow to positive two VCC2 of internal electric source by diode divided circuit 120, tabilized current power supply 1 is in running order all the time, work wave as shown in Figure 6, with under the equal experiment condition of data shown in Fig. 6, current stabilization time 1us (analog switch conducting required time), wherein, waveform 140 is alternative analog switch i output end voltage waveform, and waveform 141 is the corresponding channel selecting port signal waveform of alternative analog switch i output terminal.Most of constant-current source circuit, I
aless then start-up time is longer, I
asize direct influential system resistance measurement scope again because diode divided circuit 120 can eliminate the start-up time of constant current source 1 completely, ensure that the high speed measurement characteristics of device and measurement range adjustable, so be very important.Positive two VCC2 of internal electric source can set according to required measurement range, and pacing items is: the forward conduction voltage drop of internal electric source two VCC2 magnitude of voltage, diode divided circuit 120 and tabilized current power supply 1 minimum voltage difference and be less than the positive VCC1 magnitude of voltage of internal electric source.
Multichannel analog selector switch 2 is communicated with as shown in Figure 2,3 with n alternative analog switch 3, although together form corresponding current return to electronic circuit, as DC current I
awith the product of resistance values all on current return be greater than positive two VCC2 of internal electric source add diode divided circuit 120 forward conduction voltage drop time, DC current I
acan flow through diode divided circuit 120, this equals the maximal value of resistance measurement scope with the tested electronic circuit resistance value that the data acquisition system (DAS) 4 of computing power calculates.I.e. DC current I
aneed to be less than positive two VCC2 of internal electric source with the product of resistance values all on current return and add diode divided circuit forward conduction voltage drop.
Interface protective circuit 6 is that magnitude of voltage exceedes the voltage sample interface of hyperchannel switching detection device and the voltage carrying capacity of analog switch, and then damage device in order to prevent tested electronic circuit when being energized.
In the present embodiment, the effect of DCDC insulating power supply 5 become reconciled be in, in actual test system, external power source negative terminal is often communicated with the power supply ground of tested electronic circuit, if external power source negative terminal OUTGND is also communicated with internal electric source negative terminal GND simultaneously, link 1 and link 15 respectively with the Liang Tiaodi circuit UNICOM of tested electronic circuit, now break-make detection is carried out to the circuit between link 1 and link 15, even if there is open circuit fault in the electronic circuit that link 15 connects, electric current also can be flowed out by link 1, and flowed back to by power supply, form current return, now the corresponding sample port of link 1 just has the voltage existence meeting normal condition, and the corresponding sample port voltage of link 15 is close to 0v, if do not done special judgement process, data acquisition system (DAS) with computing power will the tested electronic circuit of error detection be still path, produce and detect mistake, so add DCDC insulating power supply 5 between external power source and internal electric source, the all current returns between any non-passage can be cut off in measuring process, multiple branch circuit is avoided to shunt the detection mistake introduced.The use of DCDC insulating power supply 15, also normally can use even if make apparatus of the present invention be communicated with by electronic circuit ground level, add use dirigibility.
Innovative point of the present invention is:
1, the present invention is combined by the analog switch of difference in functionality dexterously, coordinate controllable constant-current source, define can be program control any two-way electronic circuit between short circuit, open circuit detect, and while forward resistance and back resistance can being completed when not needing to reinstall circuit measure.
2, after sampling, adopt two sample voltage value to do the account form of subtraction, the measured value impact that the internal resistance existed in removal current return completely brings, ensure that the measuring precision.
3, the use of diode divided circuit, completely eliminates the start-up time of constant current source, coordinates high-speed analog switch to do passage bridge in addition, ensure that the high speed of systematic survey.
4, the use of DCDC insulating power supply, also normally can use even if make apparatus of the present invention be communicated with tested electronic circuit ground level, add use dirigibility.
5, can by regulating the constant current size of constant current source, directly change measurement range size, can flexible according to different application scenarios, easy to use.
Compared with prior art, the present invention has following advantage:
1, can carry out between any electronic circuit resistance measurement by hyperchannel, and then realize short circuit and open circuit judges, for different application scenarios, application flexibility is extremely strong.
2, can after connecting circuit, the disposable measurement completing forward resistance value and back resistance value, do not need rewiring, Testing index is many.
3, Measuring Time is extremely short, in the detection application of complication system, even if there are very many passages to need to detect, also can complete whole test within the extremely short time, increase substantially quality testing efficiency.
4, the use of insulating power supply and tabilized current power supply, the convenience that the system that substantially increases uses and the adaptive faculty to different application occasion.
Although be described the illustrative embodiment of the present invention above; so that those skilled in the art understand the present invention; but should be clear; the invention is not restricted to the scope of embodiment; to those skilled in the art; as long as various change to limit and in the spirit and scope of the present invention determined, these changes are apparent, and all innovation and creation utilizing the present invention to conceive are all at the row of protection in appended claim.
Claims (3)
1. a multi-channel circuit on-off detection device, comprising:
One constant current source, exports the DC current for detecting;
It is characterized in that, also comprise:
One multichannel analog selector switch, this switch has an input end and n output terminal, and input end is connected with constant current source, and the DC current that constant current source exports inputs from input end, then according to the selection of multichannel analog selector switch, a corresponding output terminal is outputted to;
N alternative analog switch, each alternative analog switch has two input ends and an output terminal, and an input end in two input ends is connected with an output terminal of multichannel analog selector switch, another input end grounding; Output terminal is connected with the electronic circuit link of multi-channel circuit on-off detection device; The input end that each alternative analog switch is connected with the output terminal of multichannel analog selector switch is connected with the output terminal of multichannel analog selector switch one by one;
With the data acquisition system (DAS) of computing power, this system comprises two channel selecting ports and a voltage sample interface; Wherein, one channel selecting port is for controlling multichannel analog selector switch, i-th output terminal is selected to export, another channel selecting port is then for controlling multiple alternative analog switch, a jth alternative analog switch is allowed to select ground connection input end, the input end be connected with the output terminal of multichannel analog selector switch all selected by other alternative analog switches, for detecting the electronic circuit between multi-channel circuit on-off detection device electronic circuit link i, j; Voltage sample interface comprises n sample port, is connected respectively to the output terminal of n alternative analog switch;
With computing power data acquisition system (DAS) first according to i-th, the voltage V that gathers of j sample port
i, V
jcarry out following calculating, obtain the resistance value RL of the electronic circuit be connected between link i, j
ij:
Wherein, I
afor the DC current that constant current source exports;
Then, by resistance value RL
ijcompare with the threshold value of inner setting, obtain the on off operating mode of the electronic circuit between link i, j.
2. multi-channel circuit on-off detection device according to claim 1, it is characterized in that, also comprise diode divided circuit, its anode is connected with constant current source DC current output terminal, negative terminal is connected with positive two VCC2 of internal electric source, and the positive VCC1 of internal electric source is constant current source power supply;
Positive two VCC2 of internal electric source set according to required measurement range, pacing items is: the forward conduction voltage drop of the positive two VCC2 magnitudes of voltage of internal electric source, diode divided circuit and constant current source minimum voltage difference and be less than the positive VCC1 magnitude of voltage of internal electric source, and DC current I
aneed to be less than positive two VCC2 of internal electric source with the product of resistance values all on current return and add diode divided circuit forward conduction voltage drop.
3. multi-channel circuit on-off detection device according to claim 2, is characterized in that, also comprises DCDC insulating power supply;
External power source anode+Vout and external power source negative terminal OUTGND powers, and is converted to internal electric source through DCDC insulating power supply; Internal electric source anode is converted to the positive VCC1 of internal electric source and positive two VCC2 of internal electric source through source of stable pressure or power level change-over circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310555083.6A CN103558495B (en) | 2013-11-11 | 2013-11-11 | A kind of multi-channel circuit on-off detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310555083.6A CN103558495B (en) | 2013-11-11 | 2013-11-11 | A kind of multi-channel circuit on-off detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103558495A CN103558495A (en) | 2014-02-05 |
| CN103558495B true CN103558495B (en) | 2016-03-23 |
Family
ID=50012797
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310555083.6A Active CN103558495B (en) | 2013-11-11 | 2013-11-11 | A kind of multi-channel circuit on-off detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103558495B (en) |
Families Citing this family (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104615949B (en) * | 2015-03-02 | 2017-08-25 | 中国电子科技集团公司第五十八研究所 | The circuit design method and the detection method to hardware Trojan horse of raising hardware Trojan horse detection resolution based on isolated from power |
| CN105158634B (en) * | 2015-09-23 | 2018-04-03 | 中国人民解放军理工大学 | It is a kind of can expanding type signal level lightning protection device broken string, short, intersect short circuit and DC impedance measuring circuit system |
| CN105759234B (en) * | 2016-04-14 | 2018-10-23 | 中国人民解放军91663部队 | Four-way output device suitable for multi-functional calibration source |
| CN106066446A (en) * | 2016-06-29 | 2016-11-02 | 南京国电南自美卓控制系统有限公司 | A kind of multichannel analog amount input circuit break detection circuit and method |
| CN106019064A (en) * | 2016-08-04 | 2016-10-12 | 歌尔股份有限公司 | Electronic element on-off measuring method and equipment applied to same |
| TWI640005B (en) * | 2016-12-27 | 2018-11-01 | 旺宏電子股份有限公司 | Method for generating a data set on an integrated circuit, method of manufacturing an integrated circuit, and integrated circuit device |
| CN106841906B (en) * | 2017-01-12 | 2019-09-13 | 广东美的暖通设备有限公司 | The compressor wiring recognition methods of Air-Cooled Heat Pump Unit and device |
| CN107315152A (en) * | 2017-04-28 | 2017-11-03 | 中国人民解放军91550部队 | A kind of many Measurement channel built-in self-test circuit designs |
| CN107300681A (en) * | 2017-04-28 | 2017-10-27 | 中国人民解放军91550部队 | A kind of multi-channel measurement circuit design |
| CN107907779B (en) * | 2017-11-03 | 2020-02-18 | 中车青岛四方机车车辆股份有限公司 | Handheld cable conduction testing device, system and method for railway vehicle |
| CN107817436A (en) * | 2017-11-21 | 2018-03-20 | 苏州恒境环保科技有限公司 | Universal multichannel PCBA broken circuit detection circuits and its detection method |
| CN108919037A (en) * | 2018-10-11 | 2018-11-30 | 苏州恒境环保科技有限公司 | Universal multichannel PCBA short circuit detector and its detection method |
| CN109341722B (en) * | 2018-11-21 | 2022-04-12 | 中国船舶重工集团公司第七0七研究所 | Multi-path constant current source for high-precision IF conversion module calibration |
| CN111426868B (en) * | 2020-04-23 | 2022-03-29 | 合肥巨一动力系统有限公司 | Controller current sampling system |
| CN112098902A (en) * | 2020-08-31 | 2020-12-18 | 贵州天义电器有限责任公司 | Multichannel load on-off state acquisition circuit based on 28V DC power circuit |
| CN112269147A (en) * | 2020-10-19 | 2021-01-26 | 上海闻泰信息技术有限公司 | Detection device |
| CN113406535B (en) * | 2021-06-17 | 2023-10-24 | 合肥京东方视讯科技有限公司 | Test board and test method for detecting electronic wires between boards |
| CN113504395A (en) * | 2021-08-05 | 2021-10-15 | 上海御渡半导体科技有限公司 | Method for detecting connectivity of ATE channel |
| CN116718814B (en) * | 2023-08-04 | 2023-11-07 | 上海华建电力设备股份有限公司 | Switching circuit and method for measuring current-voltage resistance by using same |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61202171A (en) * | 1985-03-06 | 1986-09-06 | Fujitsu Ltd | Multiterminal short-circuiting checker |
| JPS63100382A (en) * | 1986-10-17 | 1988-05-02 | Hitachi Ltd | Wire disconnection detecting method |
| CN2599595Y (en) * | 2003-01-16 | 2004-01-14 | 中国航空工业第一集团公司航空动力控制系统研究所 | Line pencil detector |
| CN101937038B (en) * | 2009-07-02 | 2013-12-25 | 中国第一汽车集团公司无锡油泵油嘴研究所 | Intelligent multi-core cable harness detection device |
| CN202393859U (en) * | 2011-12-24 | 2012-08-22 | 天津光电通信技术有限公司 | Large-scale signal cable on/off status detection equipment based on multi-channel analog switch cascade mode |
| CN202794412U (en) * | 2012-07-15 | 2013-03-13 | 天津市德盛源电子有限公司 | On-off detector |
-
2013
- 2013-11-11 CN CN201310555083.6A patent/CN103558495B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN103558495A (en) | 2014-02-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103558495B (en) | A kind of multi-channel circuit on-off detection device | |
| US10969419B2 (en) | Insulation detection circuit, detection method and battery management system | |
| CN102047128B (en) | Inverter current measurement using shunt resistor | |
| CN103777067A (en) | Chip power-consumption measurement circuit, chip, and chip power-consumption measurement method | |
| CN103729049A (en) | Method and apparatus of voltage scaling techniques | |
| AU2019431775B9 (en) | Power conversion apparatus, and method controlling output impedance of power conversion apparatus | |
| CN103592592A (en) | IGBT switch characteristic test circuit and IGBT switch characteristic test method | |
| CN109490606B (en) | Isolation voltage detection device | |
| CN201819982U (en) | Power supply detection device | |
| CN104714074A (en) | Thyristor breakover voltage drop measurement system and method | |
| CN100531474C (en) | Heater power control circuit and burn-in apparatus using the same | |
| CN206583938U (en) | Test switching circuit for component capacitive equipment | |
| CN106714367B (en) | Constant-current circuit and its constant-current controller | |
| CN108663583B (en) | Power device electrical stress testing system and method | |
| CN105223412A (en) | A kind of current detection circuit and power management chip | |
| CN103698578A (en) | Power output control method of automatic electric power meter reading system and automatic electric power meter reading system | |
| CN112649726A (en) | Switch mechanical life testing circuit and method | |
| CN108475982A (en) | A kind of switching power circuit and switch power supply current detection method | |
| CN104849562A (en) | Device and method for detecting impedance abnormality of power supply system | |
| CN110850316B (en) | Direct current resistance tester and method for all single batteries in battery pack | |
| CN108287301B (en) | IGBT driver testing system and method | |
| CN212391534U (en) | Current detection circuit | |
| CN211856709U (en) | Current detection circuit | |
| CN213633620U (en) | Loop resistance tester | |
| CN105004900A (en) | Power supply voltage monitoring circuit, and electronic circuit including the power supply voltage monitoring circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 611731 Sichuan city of Chengdu province high tech Zone West Road (West) core Guoteng Science Park No. 3, No. 11 A202 Patentee after: Chengdu shuchuang Daneng Technology Co.,Ltd. Address before: 611731 Sichuan city of Chengdu province high tech Zone West Road (West) core Guoteng Science Park No. 3, No. 11 A202 Patentee before: CHENGDU SCREATE TECHNOLOGY Co.,Ltd. |