CN202330615U - Electrical grounding detection circuit - Google Patents
Electrical grounding detection circuit Download PDFInfo
- Publication number
- CN202330615U CN202330615U CN 201120485849 CN201120485849U CN202330615U CN 202330615 U CN202330615 U CN 202330615U CN 201120485849 CN201120485849 CN 201120485849 CN 201120485849 U CN201120485849 U CN 201120485849U CN 202330615 U CN202330615 U CN 202330615U
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- China
- Prior art keywords
- power supply
- resistance
- electromagnetic transformer
- testing circuit
- electrical grounding
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- Expired - Lifetime
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Abstract
The utility model discloses an electrical grounding detection circuit, which comprises a voltage-dividing circuit connected with the power supply of detected equipment and the ground terminal of the detected equipment, the power supply of the detected equipment is two-phase, the two-phase power supply is respectively connected with the primary of an electromagnetic transformer through divider resistors, the primary of the electromagnetic transformer comprises two windings which have the same parameters and are in opposite directions, one end of each winding is connected with the two-phase power supply, the other ends of the two windings are connected with the ground terminal of the detected equipment, both ends of the secondary coil of the electromagnetic transformer are connected with both ends of a detection resistor, the output of the detection resistor is connected with the positive input end of a comparator, the negative input end of the comparator is connected with comparative voltage, and the output end of the comparator is connected with the cathode of a detection circuit through a light-emitting diode and a resistor. The simple electrical grounding detection circuit can detect the grounding condition, is simple and intuitive, and can be widely applied in the field of grounding detection.
Description
Technical field
The utility model relates to testing circuit, particularly relates to a kind of electrical grounding testing circuit.
Background technology
In multiple on-the-spot high-tension testing apparatus, electrical grounding can carry out through the mode of hand inspection and testing circuit.And testing circuit can provide the signal of electricity, is convenient to automatic warning, has intelligent feature, thereby in some high-end test apparatus equipment, often adopts, and like a kind of high voltage direct current generator, when inside detects when unearthed, forbids boost operations.
Existing correlation detecting circuit detects conventional power ground; As a patent No. be 200720156026.0, denomination of invention is the utility model patent of " grounded inspection circuit "; The ground connection situation is represented in luminous combination through two neon tubes, but this detection is not directly perceived.
Therefore, be necessary conventional ground connection detection technique is carried out perfect, clearly indicate ground connection or unearthed, for on-the-spot high-potting provides safety guarantee.
The utility model content
The purpose of the utility model is in order to overcome the deficiency of above-mentioned background technology, a kind of electrical grounding testing circuit to be provided, can detecting ground connection situation, simple, intuitive through simple circuit.
To achieve these goals, the technical scheme that provides of the utility model is:
A kind of electrical grounding testing circuit; Comprise the bleeder circuit that connects equipment under test power supply and equipment under test ground terminal; Said equipment under test power supply is two phases, and said two-phase power supply is connected with the elementary of electromagnetic transformer through divider resistance respectively, said electromagnetic transformer elementaryly constitute by parameter double winding identical, in the opposite direction; A said doublewound end links to each other with two-phase power supply respectively; The said doublewound other end links to each other with the equipment under test ground terminal, and the secondary coil two ends of electromagnetic transformer link to each other with the two ends of detecting resistance, and the output terminal that detects resistance links to each other with the positive input of comparer; The other end that detects resistance links to each other with the negative pole of testing circuit, and the output terminal of comparer links to each other with the negative pole of testing circuit with resistance through light emitting diode.
In technique scheme, the negative input and the comparative voltage of said comparer join.
In technique scheme, the resistance of said two divider resistances is identical.
The utlity model has following beneficial effect:
One, the detection electric current is low, adopts sensitive electromagnetic transformer to carry out ground current and detects, and detects electric current and can be low to moderate below the 10 μ A.
Two, need not logical circuit and discern, directly provide detected state.
Three, adopt a monochromatic luminotron intuitively to show.
Four, adopt and to adjust the comparative voltage benchmark and change detection sensitivity.
Description of drawings
Fig. 1 is the schematic block circuit diagram of the utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is done further to describe in detail.
Referring to Fig. 1, the electrical grounding testing circuit of the utility model comprises two divider resistance R1 and R2, electromagnetic transformer T, detection resistance R 3, comparer IC, LED and current-limiting resistance R4 that resistance is identical.
Said electromagnetic transformer T is the electromagnetic transformer of ribbon core; The elementary of said electromagnetic transformer T is parameter double winding identical, in the opposite direction; The end of said divider resistance R1 and R2 links to each other respectively with by the two-phase power supply of side apparatus; The other end respectively the primary coil through electromagnetic transformer T two windings with linked to each other by the ground terminal of side apparatus; The two ends of detecting resistance R 3 link to each other with the secondary coil two ends of electromagnetic transformer T respectively, and an end that detects resistance R 3 links to each other with the negative pole of testing circuit, and the other end that detects resistance R 3 links to each other with the electrode input end of comparer IC; The negative input and the comparative voltage of comparer join, and the output terminal of comparer links to each other with the negative pole of testing circuit with resistance R 4 through LED.
The principle of the utility model is: when by the normal ground connection of ground terminal of side apparatus; Formed electric current between the winding of the primary coil through divider resistance and electromagnetic transformer T and the ground respectively by the two-phase power supply of side apparatus; This moment, the secondary coil two ends of electromagnetic transformer T will induce voltage; This voltage makes comparer be output as high level after inputing to the electrode input end of comparer, thereby it is electric shinny that LED is got, to show by the normal ground connection of side apparatus.When not had ground connection by the ground terminal of side apparatus; The winding that is passed through the primary coil of divider resistance and electromagnetic transformer T by the two-phase power supply of side apparatus respectively forms electric current; Because the primary coil of electromagnetic transformer T is a parameter double winding identical, in the opposite direction; So forming magnetic flux at the winding of the primary coil of electromagnetic transformer T can cancel each other; Thereby make the non-inductive voltage in secondary coil two ends of electromagnetic transformer T, LED is electric with regard to not getting like this, is not had normal ground connection with expression by side apparatus.
The negative input and the comparative voltage of the comparer of the utility model join, and its objective is in order to regulate the sensitivity of the utility model.
The content of not doing in this instructions to describe in detail belongs to this area professional and technical personnel's known prior art.
Claims (3)
1. electrical grounding testing circuit; Comprise the bleeder circuit that connects equipment under test power supply and equipment under test ground terminal; It is characterized in that: said equipment under test power supply is two phases, and said two-phase power supply is connected with the elementary of electromagnetic transformer through divider resistance respectively, said electromagnetic transformer elementaryly constitute by parameter double winding identical, in the opposite direction; A said doublewound end links to each other with two-phase power supply respectively; The said doublewound other end links to each other with the equipment under test ground terminal, and the secondary coil two ends of electromagnetic transformer link to each other with the two ends of detecting resistance, and the output terminal that detects resistance links to each other with the positive input of comparer; The other end that detects resistance links to each other with the negative pole of testing circuit, and the output terminal of comparer links to each other with the negative pole of testing circuit with resistance through light emitting diode.
2. electrical grounding testing circuit according to claim 1 is characterized in that: the negative input of said comparer and a comparative voltage join.
3. electrical grounding testing circuit according to claim 1 is characterized in that: the resistance of said two divider resistances is identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120485849 CN202330615U (en) | 2011-11-30 | 2011-11-30 | Electrical grounding detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120485849 CN202330615U (en) | 2011-11-30 | 2011-11-30 | Electrical grounding detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202330615U true CN202330615U (en) | 2012-07-11 |
Family
ID=46442591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120485849 Expired - Lifetime CN202330615U (en) | 2011-11-30 | 2011-11-30 | Electrical grounding detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202330615U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014026349A1 (en) * | 2012-08-13 | 2014-02-20 | 深圳市华星光电技术有限公司 | Detection circuit and detection method |
| CN106468732A (en) * | 2015-08-21 | 2017-03-01 | 环鸿电子（昆山）有限公司 | A kind of monitoring method at grounding safety control point |
| CN110244174A (en) * | 2019-06-26 | 2019-09-17 | 上海闻泰信息技术有限公司 | The test circuit of data-interface |
-
2011
- 2011-11-30 CN CN 201120485849 patent/CN202330615U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014026349A1 (en) * | 2012-08-13 | 2014-02-20 | 深圳市华星光电技术有限公司 | Detection circuit and detection method |
| CN106468732A (en) * | 2015-08-21 | 2017-03-01 | 环鸿电子（昆山）有限公司 | A kind of monitoring method at grounding safety control point |
| CN110244174A (en) * | 2019-06-26 | 2019-09-17 | 上海闻泰信息技术有限公司 | The test circuit of data-interface |
| CN110244174B (en) * | 2019-06-26 | 2023-03-21 | 上海闻泰信息技术有限公司 | Test circuit of data interface |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120711 |