CN202217030U - Device used for electrostatic discharge immunity test - Google Patents
Device used for electrostatic discharge immunity test Download PDFInfo
- Publication number
- CN202217030U CN202217030U CN2011202996945U CN201120299694U CN202217030U CN 202217030 U CN202217030 U CN 202217030U CN 2011202996945 U CN2011202996945 U CN 2011202996945U CN 201120299694 U CN201120299694 U CN 201120299694U CN 202217030 U CN202217030 U CN 202217030U
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- voltage relay
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Abstract
The utility model relates to a device used for an electrostatic discharge immunity test. The device comprises a discharge gun. The discharge gun comprises a charging resistor, a single-pole-double-throw high voltage relay, an RC circuit and a discharging gun head. The two normally-closed terminals of the single-pole-double-throw high voltage relay are respectively connected with the charging resistor and the RC circuit, and the two normally-closed terminals are connected in short-circuit manner. The normally-open terminal of the single-pole-double-throw high voltage relay is connected with the discharging gun head. The test device also comprises a current detection circuit and a control circuit. The input terminal of the current detection circuit is connected with the RC circuit, and the output terminal of the current detection circuit is connected with the control circuit. The output terminal of the control circuit is connected with the single-pole-double-throw high voltage relay. Compared with the prior art, the device of the utility model helps to guarantee that the maintaining time of static voltage is not lower than 5S, and exhibits fine test repeatability and comparability.
Description
Technical field
The utility model relates to a kind of emc testing device, especially relates to a kind of device that is used for the esd immunity test.
Background technology
When doing the esd immunity test,, then to adopt bubble-discharge to make an experiment if tested device is to do insulation usefulness.The method of bubble-discharge is that the rifle that will discharge is earlier removed from the test product surface before each discharge, and then the rifle that will discharge is slowly near test product, till discharge takes place.In the process of existing discharge rifle near test product; The retention time that electrostatic potential is not less than 5S does not guarantee; Cause the effect of ESD test influenced near the speed of tested device by sparking electrode; The ratio regular meeting that the loss of electric charge, trial voltage descend is different, so the repeatability of test findings and comparability are all poor.
The utility model content
The purpose of the utility model is exactly to provide in order to overcome the defective that above-mentioned prior art exists to guarantee that the electrostatic potential retention time is not less than 5S, and test repeatability and comparability be the esd immunity test unit preferably.
The purpose of the utility model can realize through following technical scheme: a kind of device that is used for the esd immunity test; Comprise the discharge rifle; This discharge rifle comprises a charging resistor, single-pole double-throw (SPDT) high-voltage relay, RC circuit and discharge rifle head, and the two-terminal of the normal-closed end of described single-pole double-throw (SPDT) high-voltage relay connects charging resistor and RC circuit respectively, short circuit between two normal-closed end terminals; Single-pole double-throw (SPDT) high-voltage relay Chang Kaiduan connects discharge rifle head; It is characterized in that described test unit also comprises current detection circuit and control circuit, the input end of current detection circuit connects the RC circuit; Output terminal connects control circuit, and described control circuit output terminal connects the single-pole double-throw (SPDT) high-voltage relay.
Described current detection circuit comprises magnet ring, transformer and rectifier bridge, and described magnet ring connects the RC circuit, and the input end of described transformer connects magnet ring, and output terminal connects rectifier bridge, and the output terminal of this rectifier bridge connects control circuit.
Described control circuit comprises trigger and single-chip microcomputer, and the input end of described trigger connects current detection circuit, and output terminal connects single-chip microcomputer and single-pole double-throw (SPDT) high-voltage relay respectively, and the output terminal of described single-chip microcomputer connects the reset terminal of trigger.
The external diameter of described magnet ring is 10mm, and internal diameter is 5mm, and thickness is 3mm, is wound with the copper wire of 10 astragals footpath 1mm on the magnet ring.
Described transformer is the isolating transformer of 220V/9V.
Described trigger is SN74HC74N.
Compared with prior art, the utility model is when bubble-discharge, and trial voltage can not receive the velocity effect of sparking electrode near tested device, can guarantee that the electrostatic potential retention time is not less than 5S, and the repeatability of experimental result and comparability are improved greatly.
Description of drawings
Fig. 1 is the circuit diagram of the utility model.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the utility model is elaborated.
Embodiment
As shown in Figure 1, a kind of device that is used for the esd immunity test comprises discharge rifle, current detection circuit and control circuit; The discharge rifle comprises a charging resistor 1, single-pole double-throw (SPDT) high-voltage relay 2, RC circuit 4 and discharge rifle head 3, and current detection circuit comprises magnet ring 5, transformer 6 and rectifier bridge 7, and magnet ring 5 external diameters are 10mm; Internal diameter is 5mm, and thickness is 3mm, is wound with the copper wire of 10 astragals footpath 1mm on the magnet ring; Transformer 6 is the isolating transformer of 220V/9V; Control circuit comprises trigger 8 and single-chip microcomputer 9, and the two-terminal of single-pole double-throw (SPDT) high-voltage relay 2 normal-closed ends connects short circuit between charging resistor 1 and 4, two normal-closed end terminals of RC circuit respectively; Make it be in conducting state, single-pole double-throw (SPDT) high-voltage relay 2 Chang Kaiduan connect discharge rifle head 3 always.RC circuit 4 connects magnet ring 5, detects discharge current through magnet ring 5.Transformer 6 input ends connect magnet ring 5, and output terminal connects rectifier bridge 7, and the output terminal of this rectifier bridge 7 connects the trigger 8 in the control circuit.The output terminal of trigger 8 connects single-pole double-throw (SPDT) high-voltage relay 2 and single-chip microcomputer 9 respectively, is used to control the break-make of single-pole double-throw (SPDT) high-voltage relay 2, and transmits signal and give single-chip microcomputer 9, and single-chip microcomputer 9 output terminals connect the reset terminal of trigger 8.Trigger 8 is SN74HC74N, and set termination 5V lets it be high level always, and reset terminal also meets 5V, at this moment is output as high level; Come then as rising edge, single-chip microcomputer 9 is the reset terminal zero clearing low level, and at this moment output terminal is a low level.
Before beginning discharge; Give the RC circuit 4 chargings always, make its voltage remain on the high pressure of setting always, press the trigger of discharge rifle; The Chang Kaiduan of single-pole double-throw (SPDT) high-voltage relay 2 is closed; If discharge does not take place, then single-pole double-throw (SPDT) high-voltage relay 2 is closed always, and high pressure is passed to the rifle head through charging resistor 1 always; If discharge takes place, in the inner loop of electric current rifle, discharge current will be arranged.Detect discharge current through magnet ring 5,, arrive trigger 8 through pulse of processing generation of transformer 6 and rectifier bridge 7 in case detected discharge current.When trigger 8 detects a rising edge; Then export a high level signal control single-pole double-throw (SPDT) high-voltage relay 2 and break off high pressure; Stop discharge, simultaneously this high level signal is delivered to single-chip microcomputer 9, make single-chip microcomputer 9 record dpdt double-pole double-throw (DPDT) high-voltage relay 2 states and send the reset terminal that trigger 8 is ordered in zero clearing; Make trigger 8 reset terminal zero clearings, and output low level.
Claims (6)
1. a device that is used for the esd immunity test comprises the discharge rifle, and this discharge rifle comprises a charging resistor, single-pole double-throw (SPDT) high-voltage relay, RC circuit and discharge rifle head; The two-terminal of the normal-closed end of described single-pole double-throw (SPDT) high-voltage relay connects charging resistor and RC circuit respectively; Short circuit between two normal-closed end terminals, single-pole double-throw (SPDT) high-voltage relay Chang Kaiduan connect discharge rifle head, it is characterized in that; Described test unit also comprises current detection circuit and control circuit; The input end of current detection circuit connects the RC circuit, and output terminal connects control circuit, and described control circuit output terminal connects the single-pole double-throw (SPDT) high-voltage relay.
2. a kind of device that is used for the esd immunity test according to claim 1; It is characterized in that; Described current detection circuit comprises magnet ring, transformer and rectifier bridge, and described magnet ring connects the RC circuit, and the input end of described transformer connects magnet ring; Output terminal connects rectifier bridge, and the output terminal of this rectifier bridge connects control circuit.
3. a kind of device that is used for the esd immunity test according to claim 1 and 2; It is characterized in that; Described control circuit comprises trigger and single-chip microcomputer; The input end of described trigger connects current detection circuit, and output terminal connects single-chip microcomputer and single-pole double-throw (SPDT) high-voltage relay respectively, and the output terminal of described single-chip microcomputer connects the reset terminal of trigger.
4. a kind of device that is used for the esd immunity test according to claim 2 is characterized in that the external diameter of described magnet ring is 10mm, and internal diameter is 5mm, and thickness is 3mm, is wound with the copper wire of 10 astragals footpath 1mm on the magnet ring.
5. a kind of device that is used for the esd immunity test according to claim 2 is characterized in that described transformer is the isolating transformer of 220V/9V.
6. a kind of device that is used for the esd immunity test according to claim 3 is characterized in that described trigger is SN74HC74N.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202996945U CN202217030U (en) | 2011-08-17 | 2011-08-17 | Device used for electrostatic discharge immunity test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202996945U CN202217030U (en) | 2011-08-17 | 2011-08-17 | Device used for electrostatic discharge immunity test |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202217030U true CN202217030U (en) | 2012-05-09 |
Family
ID=46016278
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202996945U Expired - Fee Related CN202217030U (en) | 2011-08-17 | 2011-08-17 | Device used for electrostatic discharge immunity test |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202217030U (en) |
-
2011
- 2011-08-17 CN CN2011202996945U patent/CN202217030U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120509 Termination date: 20140817 |
|
| EXPY | Termination of patent right or utility model |