CN202649287U - A voltage difference detector of common-ground devices - Google Patents
A voltage difference detector of common-ground devices Download PDFInfo
- Publication number
- CN202649287U CN202649287U CN 201220265110 CN201220265110U CN202649287U CN 202649287 U CN202649287 U CN 202649287U CN 201220265110 CN201220265110 CN 201220265110 CN 201220265110 U CN201220265110 U CN 201220265110U CN 202649287 U CN202649287 U CN 202649287U
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- voltage
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- voltage difference
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Abstract
The utility model discloses a voltage difference detector of common-ground devices. The voltage difference detector used for detecting voltage difference between a first device and a second device which have common ground comprises a first voltage sampling circuit, a second sampling circuit, and a comparator. The first voltage sampling circuit connected between the first device and the ground in series comprises a first power supply and a first resistor between which a first sampling voltage end is led out. The second voltage sampling circuit connected between the second device and the ground in series comprises a second power supply and a second resistor between which a second sampling voltage end is led out. The first sampling voltage end and the second sampling voltage end are respectively connected with a first input end and a second input end of the comparator which outputs difference between a first sampling voltage and a second sampling voltage.
Description
Technical field
The utility model relates to the instrument detection field, relates in particular to a kind of voltage difference pick-up unit of altogether equipment.
Background technology
In the use procedure of testing tool, many appliance requires are connected to each other use, instrument are arranged often because part does not accomplish that contact is good altogether, and causing between two instruments has voltage difference, and this voltage difference naked eyes can't be observed, but but exist.In the process of using, this voltage difference can be damaged instrument module.
Therefore just need a kind of device that can detect the voltage difference of common ground equipment.
The utility model content
The utility model is intended to propose a kind of device that can detect the voltage difference of common ground equipment.
According to an embodiment of the present utility model, a kind of voltage difference pick-up unit of altogether equipment is proposed, detect altogether the first equipment and the voltage difference between the second equipment, this voltage difference pick-up unit comprises: the first voltage sampling circuit, second voltage sample circuit and comparer.The first voltage sampling circuit is serially connected between the first equipment and the ground, and the first voltage sampling circuit comprises the first power supply and the first resistor, by drawing the first sampled voltage end between the first power supply and the first resistor.The second voltage sample circuit is serially connected between the second equipment and the ground, and the second voltage sample circuit comprises second source and the second resistor, by drawing the second sampled voltage end between second source and the second resistor.The first sampled voltage end and the second sampled voltage end are connected respectively to first input end and second input end of comparer, and comparer is exported the difference between the first sampled voltage and the second sampled voltage.
In one embodiment, the first resistor and the second resistor are the MOS resistors.
In one embodiment, this altogether the voltage difference pick-up unit of equipment also comprise the first compensating circuit and the second compensating circuit, the first compensating circuit is serially connected between the first input end of the first sampled voltage end and comparer, and the second compensating circuit is serially connected between the second input end of the second sampled voltage end and comparer.
In one embodiment, this altogether the voltage difference pick-up unit of equipment also comprise indicating circuit, indicating circuit is connected to the output terminal of comparer.Indicating circuit comprises pilot lamp, and an end of pilot lamp is connected to the output terminal of comparer, other end ground connection.
The voltage difference pick-up unit of altogether equipment of the present utility model can detect the common ground situation of common ground equipment, notifies at once when voltage difference occurring, can effectively eliminate the fault that exists voltage difference to cause owing to equipment altogether.
Description of drawings
Fig. 1 has disclosed the structural drawing according to the voltage difference pick-up unit of the common ground equipment of an embodiment of the present utility model.
Embodiment
With reference to shown in Figure 1, the utility model has disclosed a kind of voltage difference pick-up unit 100 of altogether equipment, this voltage difference pick-up unit 100 detect altogether the first equipment 201 and the voltage difference between the second equipment 202, this voltage difference pick-up unit 100 comprises: the first voltage sampling circuit 102, second voltage sample circuit 104, comparer 106 and indicating circuit 108.
The first voltage sampling circuit 102 is serially connected between the first equipment 201 and the ground GND.The first voltage sampling circuit 102 comprises the first power supply I1 and the first resistor R1.Between the first power supply I1 and the first resistor R1, draw the first sampled voltage end S1.In one embodiment, the first resistor R1 is the MOS resistor.The first power supply I1 produces the first electric current, produces the first sampled voltage by the first resistor, and the first sampled voltage is exported at the first sampled voltage end S1.
Second voltage sample circuit 104 is serially connected between the second equipment 202 and the ground GND.Second voltage sample circuit 104 comprises second source I2 and the second resistor R2.Between second source I2 and the second resistor R2, draw the second sampled voltage end S2.In one embodiment, the second resistor R2 is the MOS resistor.Second source I2 produces the second electric current, produces the second sampled voltage by the second resistor, and the second sampled voltage is exported at the second sampled voltage end S2.
The first sampled voltage end S1 and the second sampled voltage end S2 are connected respectively to first input end B1 and the second input end B2 of comparer 106.Comparer is exported the difference between the first sampled voltage and the second sampled voltage.In the embodiment shown in fig. 1, also comprise the first compensating circuit C1 and the second compensating circuit C2, the first compensating circuit C1 is serially connected between the first input end B1 of the first sampled voltage end S1 and comparer, and the second compensating circuit C2 is serially connected between the second input end B2 of the second sampled voltage end S2 and comparer.The effect of compensating circuit C1 and C2 is the error that produces at the MOS resistor owing to the difference on the manufacturing process in order to eliminate.
Indicating circuit 108 is connected to the output terminal O of comparer 106.In the embodiment shown in fig. 1, indicating circuit 108 comprises pilot lamp, and an end of pilot lamp is connected to the output terminal O of comparer 106, other end ground connection GND.When having voltage difference between the first equipment 201 and the second equipment 202, will the output voltage difference at the output terminal O of comparer 106, this voltage difference will be so that pilot lamp lights, and there is the situation of voltage difference in report.
The voltage difference pick-up unit of altogether equipment of the present utility model can detect the common ground situation of common ground equipment, notifies at once when voltage difference occurring, can effectively eliminate the fault that exists voltage difference to cause owing to equipment altogether.
Claims (5)
1. the voltage difference pick-up unit of equipment altogether is characterized in that, detect altogether the first equipment and the voltage difference between the second equipment, this voltage difference pick-up unit comprises:
The first voltage sampling circuit is serially connected between the first equipment and the ground, and the first voltage sampling circuit comprises the first power supply and the first resistor, by drawing the first sampled voltage end between the first power supply and the first resistor;
The second voltage sample circuit is serially connected between the second equipment and the ground, and the second voltage sample circuit comprises second source and the second resistor, by drawing the second sampled voltage end between second source and the second resistor;
Comparer, the first sampled voltage end and the second sampled voltage end are connected respectively to first input end and second input end of comparer, and comparer is exported the difference between the first sampled voltage and the second sampled voltage.
2. the voltage difference pick-up unit of altogether equipment as claimed in claim 1 is characterized in that, described the first resistor and the second resistor are the MOS resistors.
3. the voltage difference pick-up unit of altogether equipment as claimed in claim 1, it is characterized in that, also comprise the first compensating circuit and the second compensating circuit, the first compensating circuit is serially connected between the first input end of the first sampled voltage end and comparer, and the second compensating circuit is serially connected between the second input end of the second sampled voltage end and comparer.
4. the voltage difference pick-up unit of altogether equipment as claimed in claim 1 is characterized in that, comprises that also indicating circuit, indicating circuit are connected to the output terminal of comparer.
5. the voltage difference pick-up unit of altogether equipment as claimed in claim 4 is characterized in that, described indicating circuit comprises pilot lamp, and an end of pilot lamp is connected to the output terminal of comparer, other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220265110 CN202649287U (en) | 2012-06-06 | 2012-06-06 | A voltage difference detector of common-ground devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220265110 CN202649287U (en) | 2012-06-06 | 2012-06-06 | A voltage difference detector of common-ground devices |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202649287U true CN202649287U (en) | 2013-01-02 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220265110 Expired - Fee Related CN202649287U (en) | 2012-06-06 | 2012-06-06 | A voltage difference detector of common-ground devices |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202649287U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108287289A (en) * | 2017-01-10 | 2018-07-17 | 华为技术有限公司 | Detection circuit and its detection method altogether |
| WO2019105753A1 (en) * | 2017-11-28 | 2019-06-06 | Signify Holding B.V. | Apparatus and method for monitoring a circuit |
-
2012
- 2012-06-06 CN CN 201220265110 patent/CN202649287U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108287289A (en) * | 2017-01-10 | 2018-07-17 | 华为技术有限公司 | Detection circuit and its detection method altogether |
| WO2018130129A1 (en) * | 2017-01-10 | 2018-07-19 | 华为技术有限公司 | Common ground detection circuit and detection method thereof |
| CN108287289B (en) * | 2017-01-10 | 2020-04-21 | 华为技术有限公司 | Common ground detection circuit and detection method thereof |
| WO2019105753A1 (en) * | 2017-11-28 | 2019-06-06 | Signify Holding B.V. | Apparatus and method for monitoring a circuit |
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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: 20130102 Termination date: 20130606 |