CN201654144U - Earth leakage protective device tester - Google Patents
Earth leakage protective device tester Download PDFInfo
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- CN201654144U CN201654144U CN2009202589354U CN200920258935U CN201654144U CN 201654144 U CN201654144 U CN 201654144U CN 2009202589354 U CN2009202589354 U CN 2009202589354U CN 200920258935 U CN200920258935 U CN 200920258935U CN 201654144 U CN201654144 U CN 201654144U
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- 230000001681 protective effect Effects 0.000 title abstract description 16
- 238000012360 testing method Methods 0.000 claims abstract description 50
- 238000005070 sampling Methods 0.000 claims abstract description 8
- 238000006243 chemical reaction Methods 0.000 claims description 23
- 230000001012 protector Effects 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims description 8
- 239000004973 liquid crystal related substance Substances 0.000 abstract description 8
- 238000001514 detection method Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 20
- 239000003990 capacitor Substances 0.000 description 12
- 230000000977 initiatory effect Effects 0.000 description 5
- 230000007812 deficiency Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003278 mimic effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The utility model discloses an earth leakage protective device tester, which comprises a casing, a liquid crystal display module on the casing, keys on the casing, testing jacks, a detection circuit in the casing and a current output circuit. Two alternating current input ends of a rectifying bridge are connected with the two testing jacks on the casing, a positive output end of the rectifying bridge is connected with two power resistors, the other ends of the two power resistors are respectively connected with collector electrodes of two Darlington tubes, base electrodes of the two Darlington tubes are respectively connected with two current limiting resistors, the other ends of the two current limiting resistors are connected with an output end of a D/A converting chip, emitter electrodes of the two Darlington tubes are connected with the same sampling resistor, and the other end of the sampling resistor is connected with a negative output end of the rectifying bridge. The earth leakage protective device tester can test time and current of an earth leakage protective device, test voltage of an external circuit, can alarm and stop automatically when in line under-voltage, is multifunctional and is wide in use.
Description
Technical field
Whether qualified the present invention relates to a kind of tester for leakage protector, specifically be exactly a kind of earth leakage protective device instrument that detects,
Background technology
The tester for leakage protector volume of Ying Yonging is bigger in the market, and inner testing circuit mostly is mimic channel, by discrete component form, the circuit complexity; reliability is low, shows mostly to be section formula liquid crystal, and the liquid crystal display content is comparatively single; be not easy to be understood by the people, and complicated operation, application surface is narrow.
Summary of the invention
At above-mentioned deficiency, the invention provides a kind of rational in infrastructure, easy to use, tester for leakage protector with multiple function.
The present invention realizes by following technology:
A kind of tester for leakage protector; comprise housing; LCD MODULE on the housing; button on the housing; test jack; and the testing circuit in the housing; current output circuit; two ac input ends of rectifier bridge link to each other with two test jack on the housing; the positive output end of rectifier bridge links to each other with two power resistors; the other end of two power resistors links to each other with the collector of two Darlington transistors respectively; the base stage of two Darlington transistors links to each other with two current-limiting resistances respectively; the other end of two current-limiting resistances links to each other with the output terminal of D/A conversion chip; the emitter of two Darlington transistors links to each other with same sampling resistor, and the other end of sampling resistor links to each other with the negative output terminal of rectifier bridge.
In the described current measurement circuit, resistance R links to each other with the emitter of two Darlington transistors of current output circuit, the other end of resistance R links to each other with the input end I of A/D conversion chip, the anode of diode links to each other with the input end I of A/D conversion chip, the negative electrode of diode links to each other with the positive source of A/D conversion chip, and the control end of A/D conversion chip links to each other with the I/O mouth of single-chip microcomputer.
A kind of tester for leakage protector mainly is provided with Chinese LCD by housing, housing, and power switch, function selecting are provided with key, hummer, the compositions such as testing circuit in test jack, the housing.It is characterized in that: Chinese liquid crystal is 128 * 64 lattice lcds, and the liquid crystal control line links to each other with the single-chip microcomputer of inner testing circuit.Power switch and function selecting are provided with key and are film key, all link to each other with the single-chip microcomputer of inner testing circuit.Hummer also links to each other with the single-chip microcomputer of inner testing circuit.Inner testing circuit is core parts with the single-chip microcomputer, and current output circuit, earth leakage protective device tension measuring circuit, current measurement circuit, supply voltage metering circuit all link to each other with the A/D conversion chip, and the A/D conversion chip links to each other with single-chip microcomputer.Current output circuit is connected with current measurement circuit.Rectification circuit is connected with current output circuit.The D/A conversion chip links to each other with single-chip microcomputer, and the output of the electric current of the Control current output circuit that links to each other with current output circuit.Key press detecting circuit links to each other with external key with single-chip microcomputer.Buzzer circuit links to each other with outside hummer with single-chip microcomputer.Single-chip Controlling D/A chip, the D/A chip is given current output circuit with signal, and the electric current of current output circuit is provided by rectification circuit, and rectification circuit and earth leakage protective device load end are in series.Current measurement circuit will be delivered to the A/D conversion chip from the signal that the circuit output circuit records, and the signal that the A/D conversion chip will be handled is delivered to single-chip microcomputer, and single-chip microcomputer is delivered to Chinese liquid crystal display with signal.Single-chip microcomputer obtains the execution that the external key signal carries out corresponding function from key press detecting circuit.Single-chip Controlling hummer stone implement pipes.The supply voltage metering circuit is connected with the instrument battery, and signal is sent into the A/D conversion chip, and the A/D conversion chip is sent processing signals into single-chip microcomputer.The earth leakage protective device tension measuring circuit links to each other with rectification circuit, and measuring-signal is sent into the A/D conversion chip, and the A/D conversion chip will be handled to such an extent that signal is sent into single-chip microcomputer.
Useful benefit of the present invention is: 1, adopt integrated component and digital circuit in a large number, make equipment circuit become very succinct.2, device volume little, measure accurate safety, little power consumption, displaying contents enrich, be easy to use, easy to carry.3, can carry out testing current and time test to earth leakage protective device, external circuit is carried out voltage tester, can report to the police to line under-voltage, automatic shutdown etc. are multiple functional, use extensively.
Description of drawings
Fig. 1 is the circuit block diagram of the inside testing circuit figure of this instrument;
Wherein, 1, LCD MODULE 2, key scanning circuit 3, single chip circuit 4, D/A change-over circuit 5, current output circuit 6, current measurement circuit 7, tension measuring circuit 8, supply voltage metering circuit 9, A/D change-over circuit
Fig. 2 connects reference diagram for key scanning circuit;
Wherein, 10, testing current options button 11, time test options button 12, test initiating key 13, gear key 14, LCD backlight key 15, on ﹠ off switch
Fig. 3 connects reference diagram for current output circuit;
Fig. 4 connects reference diagram for the D/A output circuit;
Fig. 5 connects reference diagram for the microcontroller power supply circuit;
Fig. 6 connects reference diagram for the A/D change-over circuit;
Fig. 7 connects reference diagram for the earth leakage protective device tension measuring circuit;
Fig. 8 is the tester for leakage protector outside drawing;
Wherein, 16, LCD MODULE 17, testing current options button 18, time test options button 19, test initiating key 20, gear key 21, LCD backlight key 22, on ﹠ off switch 23, test port AC124, test port AC225, housing.
Embodiment
Fig. 1 is the inner testing circuit circuit block diagram of this tester.LCD MODULE 1 links to each other displaying contents by Single-chip Controlling with single chip circuit 2.Key scanning circuit 1 links to each other with single chip circuit 2, for single-chip microcomputer provides push button signalling.D/A change-over circuit 4 links to each other with single chip circuit 2 and is subjected to Single-chip Controlling, and output links to each other with current output circuit 5, the electric current output of Control current output circuit 5.Current measurement circuit 6 links to each other with current output circuit 5, adopts to such an extent that current signal is delivered to A/D change-over circuit 9.Tension measuring circuit is adopted to such an extent that voltage signal is delivered to A/D change-over circuit 9 from current output circuit 5.Power measurement circuit 8 is adopted to such an extent that the instrument power source signal is delivered to A/D change-over circuit 9 and carried out signal Processing.A/D change-over circuit 9 is delivered to single chip circuit 2 with the signal of handling and is carried out further signal Processing.
Fig. 2 connects reference diagram for key scanning circuit.The testing current options button 10 1 end ground connection other ends and resistance R 1, capacitor C 1 links to each other, resistance R 1 links to each other with the other end of capacitor C 1, the time test options button 11 1 end ground connection other ends and resistance R 2, capacitor C 2 links to each other, resistance R 2 links to each other with the other end of capacitor C 2, the test initiating key 12 1 end ground connection other ends and resistance R 3, capacitor C 3 links to each other, and resistance R 3 links to each other with the other end of capacitor C 3, the gear key 13 1 end ground connection other ends and resistance R 4, capacitor C 4 links to each other, resistance R 4 links to each other with the other end of capacitor C 4, the LCD backlight key 14 1 end ground connection other ends and resistance R 5, and capacitor C 5 links to each other, resistance R 5 links to each other with the other end of capacitor C 5, the on ﹠ off switch 15 1 end ground connection other ends and resistance R 6, capacitor C 6 links to each other, and resistance R 6 links to each other with the other end of capacitor C 6.Port K1, K2, K3, K4, K5, K6 link to each other with the single-chip microcomputer of single chip circuit 3 respectively.
Fig. 3 connects reference diagram for current output circuit.Port A links to each other with the earth leakage protective device load end.Rectifier bridge B1 is connected with port A, make outside industrial-frequency alternating current carry out rectification, rectifier bridge B1 output links to each other with R10 with two power resistor R9, the output terminal of resistance R 9 and R10 links to each other with the collector of two Darlington transistor Q1 and Q2 respectively, the emitter of Q1 and Q2 links to each other with sampling resistor R11, the other end ground connection of sampling resistor R11.The base stage of Q1 and Q2 links to each other with resistance R 7, R8 respectively, resistance R 7, R8.Port B links to each other with the port G of the D/A output circuit of Fig. 4, exports the electric current output of Control current output circuit 5 by the voltage of D/A output circuit.Port C links to each other with the port I2 of the A/D change-over circuit of Fig. 6.
Fig. 4 connects reference diagram for the D/A output circuit.The 5th pin of D/A conversion chip IC1 connects voltage reference chips W 1, and the R end of W1 links to each other the other end ground connection of R12 with resistance R 12.The G end of IC1 is connected reference diagram with Fig. 3 current output circuit B end links to each other, the electric current output of Control current output circuit.The D of IC1, E, F end link to each other with the one-chip machine port of single chip circuit 3 and are subjected to Single-chip Controlling.
Fig. 5 connects reference diagram for the microcontroller power supply circuit.Instrument power source is by port H3 input.Link to each other by feedback resistance R15 between the emission collection of triode Q3 and the base stage.The emitter of Q3 links to each other with positive source, the collector of Q3 links to each other with three-terminal voltage-stabilizing chip Q5, the output terminal 3 of Q5 provides power supply for single chip circuit, A/D change-over circuit 9 and D/A change-over circuit 4, the base stage of Q3 links to each other with resistance R 16 with diode, R16 connects the collector of triode Q4, be connected by feedback resistance R19 between the base stage of Q4 and the emitter, the emitter of Q4 links to each other with ground.The other end of diode D1 links to each other with resistance R 17, and R17 links to each other with diode D2.Port H4 links to each other with on ﹠ off switch 15, and port H1 links to each other with the single-chip microcomputer of single chip circuit 3 respectively with H2.When on ﹠ off switch 15 was pressed, the H4 port was put low, and the 3 ends output VCC of triode Q3 conducting three-terminal voltage-stabilizing chip makes port H2 put height, thereby makes triode Q4 conducting, even this moment, on ﹠ off switch 15 unclamped, triode Q3 still conducting realizes power up function.When on ﹠ off switch 15 was pressed once more, the H4 port was put low, and it is low making port H1, single-chip microcomputer in the single chip circuit 3 detects port H1, port H2 is put low, and triode Q4 is ended, thereby triode Q3 is ended, make the collector output of triode Q3 low, thereby realize the shutdown function.Divider resistance R14 links to each other with the emitter of triode Q3, and divider resistance R13 links to each other with R14, and the other end of divider resistance R14 links to each other with ground.Port H is connected reference diagram with the A/D change-over circuit of Fig. 6 port I4 links to each other, for A/D change-over circuit 9 provides power supply voltage signal.
Fig. 6 connects reference diagram for the A/D change-over circuit.1,2,3 pin of A/D conversion chip IC2 link to each other with resistance R 20, R21, R22 respectively, and 1,2 pin of IC2 link to each other with protection diode D3, D4 again.Port I1 links to each other with the single-chip microcomputer of single chip circuit 3, makes the switching signal of A/D conversion chip can read in single-chip microcomputer.
Fig. 7 connects reference diagram for the earth leakage protective device tension measuring circuit.Divider resistance R24 is connected the rectifier bridge B1 of reference diagram with the current output circuit of Fig. 32 pin link to each other, and divider resistance R23 links to each other with R24, and the other end links to each other with ground.Port G2 is connected reference diagram with the A/D change-over circuit of Fig. 6 I3 links to each other.By divider resistance R23 and R24 dividing potential drop,, carry out analog to digital conversion with the IC2 of rectification voltage signal acquisition later to the A/D change-over circuit connection reference diagram of Fig. 6.
Using method:
1, testing current; two test pencils be will test and test port AC123 and test port AC224 inserted respectively; measuring gear by gear key 13 selects; carry out the test pattern of earth leakage protective device selects by testing current options button 11; test by test initiating key 12, at have no progeny on liquid crystal display electric current when showing disjunction of earth leakage protective device branch.
2, time test; two test pencils be will test and test port AC123 and test port AC224 inserted respectively; measuring gear by gear key 13 selects; test options button 12 carries out the test pattern selection of earth leakage protective device on time; test by test initiating key 12, have no progeny on liquid crystal display electric current when showing disjunction and the time when beginning to be energized to disjunction at the earth leakage protective device branch.
3, carry out the control of LCD backlight by LCD backlight key 14, can realize the automatic shutdown of instrument by the microcontroller power supply circuit connection reference diagram of Fig. 5.
Claims (2)
1. tester for leakage protector; comprise housing; LCD MODULE on the housing; button on the housing; test jack; and the testing circuit in the housing; current output circuit; it is characterized in that: two ac input ends of rectifier bridge link to each other with two test jack on the housing; the positive output end of rectifier bridge links to each other with two power resistors; the other end of two power resistors links to each other with the collector of two Darlington transistors respectively; the base stage of two Darlington transistors links to each other with two current-limiting resistances respectively; the other end of two current-limiting resistances links to each other with the output terminal of D/A conversion chip; the emitter of two Darlington transistors links to each other with same sampling resistor, and the other end of sampling resistor links to each other with the negative output terminal of rectifier bridge.
2. according to claims 1 described a kind of tester for leakage protector; it is characterized in that: in the described current measurement circuit; resistance R links to each other with the emitter of two Darlington transistors of current output circuit; the other end of resistance R links to each other with the input end I of A/D conversion chip; the anode of diode links to each other with the input end I of A/D conversion chip; the negative electrode of diode links to each other with the positive source of A/D conversion chip, and the control end of A/D conversion chip links to each other with the I/O mouth of single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202589354U CN201654144U (en) | 2009-11-17 | 2009-11-17 | Earth leakage protective device tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202589354U CN201654144U (en) | 2009-11-17 | 2009-11-17 | Earth leakage protective device tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201654144U true CN201654144U (en) | 2010-11-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202589354U Expired - Fee Related CN201654144U (en) | 2009-11-17 | 2009-11-17 | Earth leakage protective device tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201654144U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102062823A (en) * | 2009-11-17 | 2011-05-18 | 张朝 | Electric leakage protection device tester |
| CN102955094A (en) * | 2011-08-31 | 2013-03-06 | 环旭电子股份有限公司 | Leakage sensing circuit and mainboard with same |
-
2009
- 2009-11-17 CN CN2009202589354U patent/CN201654144U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102062823A (en) * | 2009-11-17 | 2011-05-18 | 张朝 | Electric leakage protection device tester |
| CN102062823B (en) * | 2009-11-17 | 2013-07-31 | 张朝 | Electric leakage protection device tester |
| CN102955094A (en) * | 2011-08-31 | 2013-03-06 | 环旭电子股份有限公司 | Leakage sensing circuit and mainboard with same |
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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: 20101124 Termination date: 20111117 |