CN202083768U - Current tester - Google Patents
Current tester Download PDFInfo
- Publication number
- CN202083768U CN202083768U CN2011201608124U CN201120160812U CN202083768U CN 202083768 U CN202083768 U CN 202083768U CN 2011201608124 U CN2011201608124 U CN 2011201608124U CN 201120160812 U CN201120160812 U CN 201120160812U CN 202083768 U CN202083768 U CN 202083768U
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Abstract
A current tester comprises an input power supply, an input switch and an output switch. A voltage regulator, a transformer, an ammeter and a load resistor are sequentially connected between the input switch and the output switch to form a current booster; an input power supply is connected to the input end of the current booster through the input switch, and the output end of the current booster is connected to the terminal of a product to be tested through the output switch; an isolating adapter and a one-chip microcomputer circuit are sequentially connected between the output end of the input power supply and the output end of the current booster, and a display is connected to the one-chip microcomputer circuit; the current of the terminal of the product to be tested is changed by adjusting the volume by means of the voltage regulator and the transformer; and the one-chip microcomputer circuit determines whether a current passes through the product to be tested by measuring the voltage of the connecting point of the load resistor and the output switch, and the electrifying time is displayed by digital tubes driven by the one-chip microcomputer circuit, thus realizing automatic electrifying timing function. The current test has a simple structure, and satisfies the basic requirements for large current test of common electronic manufacturers.
Description
Technical field
The utility model relates to the measurement instrument with the anti-testing current of product, particularly a kind of current tester.
Background technology
In electronics, electric, robotization industry, often need work such as components and parts, product, testing equipment, debugging with bigger electric current, during using, this class just needs big electric current, to the voltage no requirement (NR), there is dual mode to reach this purpose at present, 1. directly obtain big electric current with the connect load of certain resistance of civil power, but the power that the acquisition mode of the big electric current of this mode needs is big, common power utilization network can't be born, electric current as demand 50A, the input of 220V voltage, pull-up resistor is 4.4 Ω, power is 11KW; Do not isolate, Danger Electric shock risk is arranged, and the occasion that much needs to isolate can not be used; Adjusting electric current inconvenience needs outage back manual change pull-up resistor to regulate, and can not onlinely regulate; 2. adopt professional equipment (as AC power able to programme) to obtain big electric current, can reach comparatively ideal effect (electric current is big, power is low, isolation, easy to adjust), but professional equipment cost height, price generally several ten thousand between the hundreds of thousands.For those abundant enterprises of big fund technology, often need to use the occasion of high-current test, debugging, substantially can buy professional equipment, but for the less enterprises and institutions of scale, use occasion is not very frequent, buy professional equipment and just do not calculate very much, adopt first kind of simple method then to have above-mentioned many shortcomings; Performance that common electronics producer must test supplied materials manufactuerer's output insurance silk, isolating switch, power switch, socket etc. with big electric current for example, therefore these occasions use big electric current not frequent, extremely need low price, can satisfy the test instrumentation of high-current test needs.
The utility model content
For addressing the above problem, the utility model aims to provide a kind of current tester.
The technical scheme that the utility model addresses the above problem employing is: a kind of current tester, comprise input power supply, input switch and output switch, it is characterized in that: connect one between the switch successively and constitute to exporting by pressure regulator, transformer, reometer and pull-up resistor at input switch
Current lifting deviceThe input power supply is connected with the input end of current lifting device by input switch, the output terminal of current lifting device by export switch and
Product terminals to be measuredConnect; Output terminal at the input power supply is isolated adapter and single chip circuit to being connected with in turn between the output terminal of current lifting device, and display is connected with single chip circuit.
Pressure regulator input end of the present utility model also is connected to an input indicator, a pull-up resistor output indicator in parallel.
Pressure regulator no-load voltage ratio of the present utility model is 220:0～240, and input voltage is an alternating current 220V, output 0～240V.
The no-load voltage ratio of transformer of the present utility model is 220:24, with the voltage of pressure regulator output isolate, step-down output.
The beneficial effects of the utility model are: the size of current that changes the product terminals to be measured that are connected with current lifting device by pressure regulator, transformer regulation voltage size; Isolating adapter powers to single chip circuit, single chip circuit judges by the sensing lead resistance and the voltage of output switch tie point whether product to be measured has electric current to flow through, the energising timing time drives charactron by single chip circuit and shows, thereby realizes the function of energising self-clocking; The utility model state simple in structure, that can be implemented in the miniwatt input is exported big electric current down, can be satisfied the primary demand of ordinary electronic producer to the product high-current test, and its production cost is lower than professional high-current test equipment.
Description of drawings
Fig. 1 is a circuit structure block scheme of the present utility model.
Among the figure: 1. import power supply; 2. input switch; 3. output switch; 4. current lifting device; 4.1. pressure regulator; 4.2. transformer; 4.3. reometer; 4.4. pull-up resistor; 5. product terminals to be measured; 6. isolation adapter; 7. single chip circuit; 8. display; 9. input indicator; 10. output indicator.
Embodiment
Below in conjunction with drawings and Examples the utility model is further specified.
A kind of current tester as shown in Figure 1, the positive pole of input power supply 1 is connected with the input of pressure regulator 4.1 is anodal through input switch 2, and the input of transformer 4.2 is anodal to be connected with the adjusting output terminal of pressure regulator 4.1; The input negative electricity of the negative pole of input power supply 1, the input negative pole of pressure regulator 4.1, transformer 4.2 connects; The both positive and negative polarity input end of pressure regulator 4.1 input indicator 9 that is connected in parallel; The output cathode series current table 4.3 of transformer 4.2 and pull-up resistor 4.4, the scalable that pressure regulator 4.1, transformer 4.2, reometer 4.3 and pull-up resistor 4.4 constitute provides the current lifting device 4 of big electric current, pull-up resistor 4.4 output indicators 10 in parallel, the electric resistance array that pull-up resistor 4.4 is made up of high-power cement resistor or metallic resistance, resistance can be set according to the electric current demand, and the other end of pull-up resistor 4.4 connects the A end of product terminals 5 through output switch 3; The output negative pole of transformer 4.2 connects the B end of product terminals 5; The input end of isolating suitable ducon 6 is connected with input power supply 1 both positive and negative polarity, the output terminal of isolating suitable ducon 6 is connected with the power end of single chip circuit 7 thinks that it provides driving power, single chip circuit 7 voltage detecting end one end be connected on pull-up resistor 4.4 and the voltage node of output between the switch 3, single chip circuit 7 the other end of voltage detecting end be connected with the negative pole of transformer 4.2, the digital display interface of single chip circuit 7 is connected with display 8, and the ground end of input power supply 1 is connected with the negative pole of transformer 4.2; So far finish connection of the present utility model.
Pressure regulator 4.1 no-load voltage ratios are 220:0～240, and input voltage is an alternating current 220V, output 0～240V; Transformer 4.2 no-load voltage ratios are 220:24, with the voltage of pressure regulator 4.1 output isolate, step-down output; Transformer 4.2 outputs connect reometer 4.3, pull-up resistor 4.4, output switch 3 and device under test, reometer 4.3 is used for measuring the current value that flows through device under test, device under test is connected on product terminals 5 to be measured, isolating adapter gives single chip circuit 7 power supplies, single chip circuit 7 detects the magnitude of voltage at product terminals to be measured 5 two ends, and single chip circuit 7 timing times show by charactron display 7; Input indicator 9 shows the state of input power supply 1, and output indicator 10 shows the state whether device under test has electric current to flow through.
Describe basic functional principle of the present utility model below in detail and implement action.
Providing the 50A electric current with need is example, input power supply 1 voltage 220V, 220V is transferred in pressure regulator 4.1 outputs, then transformer 4.2 is exported 24V, the resistance of R pull-up resistor 4.4 is 0.48 Ω (a 2KW specification), input switch 2, output switch 3 and the product to be measured that is connected product terminals 5 to be measured are all after the conducting, flow through the loop (reometer, load, output switch, product to be measured) of 4.2 levels of transformer with regard to the electric current that 50A is arranged, output indicator 4.4 is bright, mainly on pull-up resistor 4.4, its consumed power is 1200W to the power of devices consume at this moment.Adjust output current, as long as regulating the magnitude of voltage of pressure regulator 4.1 outputs just can, and the product of corresponding different current classes (being respectively 5A, 20A, 50A, 100A etc. as maximum current), can realize by the resistance value that changes transformer 4.2 no-load voltage ratios and R pull-up resistor 4.4.
Self-clocking principle of the present utility model: single chip circuit 7 judges by the sensing lead resistance 4.4 and the voltage of output switch 3 tie points whether product terminals 5 to be measured have electric current to flow through, thereby realizes the function of energising self-clocking.Under the situation of output switch 3 closures, during product conducting to be measured, the transformer 4.2 output voltage overwhelming majority all are applied to R pull-up resistor 4.4 two ends, the voltage of test point equals zero substantially, and the A of product terminals 5 to be measured, B two ends be when disconnecting, and transformer 4.2 output loops do not have electric current to flow through, and the voltage of test point equals the voltage of transformer output terminal, single chip circuit 7 can detect this two kinds of different states by ADC, thereby realizes self-clocking.For example to test the fusing time of a fuse, then can configure current value earlier, connect fuse, this moment single chip circuit 7 to detect test point voltage higher, be the state that the loop disconnects, closed output switch 3, test point voltage dropped to and approached zero this moment, single chip circuit 7 detects state variation, picks up counting automatically, after the certain time, blown fuse, single chip circuit 7 detects the variation of state automatically, stops timing, and fusing time is presented on the charactron display 8.The utility model also can be used for the big electric current reliability testing of products such as switch, socket, plug, relay, delay action circuit breaker and contactor except that the measurement that can be used for fuse.
Above embodiment is only for the usefulness that the utility model is described, but not to restriction of the present utility model, those skilled in the art, under the situation that does not break away from spirit and scope of the present utility model, can also make various conversion or variation, therefore, all technical schemes that are equal to also should belong to category of the present utility model, should be limited by each claim.
Claims (4)
1. current tester comprises input power supply, input switch and output switch, it is characterized in that: connect one between the switch successively and be made of pressure regulator, transformer, reometer and pull-up resistor to exporting at input switch
Current lifting deviceThe input power supply is connected with the input end of current lifting device by input switch, the output terminal of current lifting device by export switch and
Product terminals to be measuredConnect; Output terminal at the input power supply is isolated adapter and single chip circuit to being connected with in turn between the output terminal of current lifting device, and display is connected with single chip circuit.
2. a kind of current tester as claimed in claim 1 is characterized in that: described pressure regulator input end also is connected to an input indicator, a pull-up resistor output indicator in parallel.
3. a kind of current tester as claimed in claim 1 or 2 is characterized in that: described pressure regulator no-load voltage ratio is 220:0～240.
4. a kind of current tester as claimed in claim 1 is characterized in that: the no-load voltage ratio of described transformer is 220:24.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201608124U CN202083768U (en) | 2011-05-19 | 2011-05-19 | Current tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201608124U CN202083768U (en) | 2011-05-19 | 2011-05-19 | Current tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202083768U true CN202083768U (en) | 2011-12-21 |
Family
ID=45344393
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201608124U Expired - Fee Related CN202083768U (en) | 2011-05-19 | 2011-05-19 | Current tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202083768U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102750865A (en) * | 2012-06-08 | 2012-10-24 | 郑州万特电气有限公司 | Somatosensory practical training circuit and device for wire fused in case of circuit overload |
| CN103499970A (en) * | 2013-10-18 | 2014-01-08 | 利欧集团股份有限公司 | Circuit board current detector |
-
2011
- 2011-05-19 CN CN2011201608124U patent/CN202083768U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102750865A (en) * | 2012-06-08 | 2012-10-24 | 郑州万特电气有限公司 | Somatosensory practical training circuit and device for wire fused in case of circuit overload |
| CN103499970A (en) * | 2013-10-18 | 2014-01-08 | 利欧集团股份有限公司 | Circuit board current detector |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111221 Termination date: 20130519 |