CN206975118U - A kind of device for inverse electromotive force when eliminating sweep test coil resistance - Google Patents
A kind of device for inverse electromotive force when eliminating sweep test coil resistance Download PDFInfo
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- CN206975118U CN206975118U CN201720791296.2U CN201720791296U CN206975118U CN 206975118 U CN206975118 U CN 206975118U CN 201720791296 U CN201720791296 U CN 201720791296U CN 206975118 U CN206975118 U CN 206975118U
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Abstract
A kind of device for inverse electromotive force when eliminating sweep test coil resistance is the utility model is related to, including is connected to the high-end discharge circuit driven with electric current between low side of electric current driving of relay array；Described discharge circuit includes electric discharge relay；The electric current of described electric discharge relay drives the electric current driving of high-end connection relay array high-end；Discharge the electric current driving low side that the electric current of relay drives low side to connect relay array, the control signal pin connection CPU of described electric discharge relay.The utility model is on original circuit base, two drive ends (HD＆LD) plus an electric discharge relay, before switching channel or switching range, the measurement electric current on perceptual measured piece is quickly bled off by the relay, avoids producing the current break of inverse electromotive force to eliminate inverse electromotive force.So as to avoid the damage of measuring instrument and improve measuring speed and the degree of accuracy.
Description
Technical field
Resistance scan measuring instrument field is the utility model is related to, it is especially a kind of to be used to eliminate sweep test coil resistance
When inverse electromotive force device.
Background technology
For currently requiring the higher and higher market demand to the measuring speed of direct current resistance m easurem ent, constantly have new straight
Leakage resistance sweep measuring set occurs commercially, slightly having difference in these instrumental functions, but hardware structure is essentially identical (see attached
Fig. 1).Its hardware frame produces a constant current by reference voltage circuit and source circuit and flows through measured piece, in one section of time delayed signal
After stable, then the pressure drop by sampling circuit samples measured piece both ends, and give CPU data signal by ADC and do follow-up number
Word processing.Scan function is then to add relay array (see accompanying drawing 2) in constant-current source, sample circuit and measurement end, in CPU control
To realize that constant-current source and sampled signal switch in different measurement ends under system, and then realize the function of scanning.
But in scanning survey inductance coil or Transformer Winding, it is (different in passage switching or measuring range
Measuring range corresponds to different measurement electric currents) switching when, mutation of the test electric current in perceptual measured piece can produce very big anti-
To electromotive force, the measured line conduction of inverse electromotive force enters measuring instrument, so as to destroy instrument internal circuit, frequent breakage instrument
Device.In addition, these inverse electromotive forces cause subsequent measurement signal stabilization time special due to unappropriate discharge loop
It is long, so as to reduce measuring speed and the degree of accuracy.
Utility model content
The technical problems to be solved in the utility model is：There is provided a kind of reversely electric during sweep test coil resistance for eliminating
The device of kinetic potential, realize reversely electronic caused by elimination constant flow method sweep test inductance coil (also or Transformer Winding)
Gesture, so as to eliminating the destruction caused by the inverse electromotive force to circuit and the accuracy of measurement of lowering apparatus.
Technical scheme is used by the utility model：Inverse electromotive force when one kind is used to eliminate sweep test coil resistance
Device, including be connected to the high-end discharge circuit with electric current between driving low side of electric current driving of relay array；Described
Discharge circuit includes electric discharge relay；The electric current of described electric discharge relay drives the electric current driving of high-end connection relay array
It is high-end；Discharge the electric current driving low side that the electric current of relay drives low side to connect relay array, described electric discharge relay
Control signal pin connects CPU.
When Measurement channel switches, controlled by CPU and add electric discharge sequential；After x channel measurements are completed, closure electric discharge relay
Device, the electric current of relay array is set to form short circuit between driving the high-end driving low side with electric current；To flowing through tested perceptual device
Measurement electric current is discharged；Electric discharge relay is disconnected, and closes TCH test channel x+1 control relay, starts next passage and surveys
Amount.
The beneficial effects of the utility model are：The utility model is on original circuit base, in two drive end (HD＆
LD) plus an electric discharge relay, before switching channel or switching range, by the relay on perceptual measured piece
Measurement electric current is quickly bled off, and avoids producing the current break of inverse electromotive force to eliminate inverse electromotive force.So as to avoid surveying
The damage and raising measuring speed and the degree of accuracy of measuring appratus.
Brief description of the drawings
The utility model is further illustrated with reference to the accompanying drawings and examples.
Fig. 1 is four-terminal resistance sweep test sketch in the prior art；
Fig. 2 is prior art relay array circuit structure diagram；
Fig. 3 is circuit structure diagram of the present utility model；
Fig. 4 is timing diagram of the present utility model.
Embodiment
The utility model is described in further detail presently in connection with accompanying drawing and preferred embodiment.These accompanying drawings are letter
The schematic diagram of change, only illustrates basic structure of the present utility model in a schematic way, thus its only show it is relevant with the utility model
Composition.
As shown in figure 3, HD, LD be respectively measurement signal driving it is high-end and driving low side, come from constant-current source produce electricity
Road, it forms constant current resource loop；
HS, LS be respectively the sampling of measurement signal it is high-end and sampling low side, export to adc circuit so that draw measurement knot
Fruit；
K1~K2n is scanning survey relay array, Measurement channel switching during for scanning；
HD1, LD1, HS1, LS1 collectively form Measurement channel 1；HD2, LD2, HS2, LS2 collectively form Measurement channel 2；With
This analogizes, and HDn, LDn, HSn, LSn collectively form Measurement channel n；
DUT1, DUT2 ..., DUTn be measured piece；
Discharge circuit is made up of electric discharge relay and discharge control signal；K2n+1 is electric discharge relay；Relay_Ctrl1、
Relay_Ctrl2 ..., Relay_Ctrln and Disc_Ctrl be relay control signal, from CPU；
When Measurement channel switches, controlled by CPU and add electric discharge sequential, i.e., after x channel measurements are completed, closure is put first
Electrical relay K2n+1 (sets low control signal Disc_Ctrl) so that HD and LD is by relay K2n+1 short circuits of discharging, by one
After section delay (programmable), the measurement electric current for originally flowing through tested perceptual device bleeds off the gentle relay that is discharged, now again
(putting high control signal Relay_Ctrlx) Measurement channel x control relay is disconnected (due to now flowing through measured piece x electric current
0) not have the generation of inverse electromotive force, then disconnect electric discharge relay (putting high control signal Disc_Ctrl) and closing
TCH test channel x+1 control relay (setting low control signal Relay_Ctrlx+1) starts next channel measurement.
Illustrated with reference to timing diagram as shown in Figure 4：
tm:The testing time of each passage；
td:Discharge time, it may be programmed；
K1 is closed first, is delayed by appropriate measurement, that is, starts the test to first passage, and x passages are completed by tm
After measurement, closure electric discharge relay K2n+1 (setting low control signal Disc_Ctrl) first so that HD and LD pass through relay of discharging
Device K2n+1 short circuits, after one section is delayed td (programmable), the measurement electric current for originally flowing through tested perceptual device is put gentle
Electrical relay is bled off, and now disconnects the control relay of (putting high control signal Relay_Ctrlx) Measurement channel 1 (due to this
The electric current of Shi Liujing measured pieces 1 is the generation for 0) not having inverse electromotive force, then (puts high control letter in disconnection electric discharge relay
Number Disc_Ctrl) and close the control relay (setting low control signal Relay_Ctrl2) of TCH test channel 2 and start next passage
Measurement, the like complete whole scanning process.
In summary, this case can effectively eliminate anti-as caused by switching passage in constant current scanning survey perceptual device
To electromotive force, so as to be effectively protected measuring instrument and measured piece.
Meanwhile the relay that discharges provides a low impedance discharge loop for perceptual measured piece, greatly shortens ensuing survey
The stabilization time of signal is measured, improves measuring speed and the degree of accuracy (being directed to each winding of transformer) of measurement.
Simply specific embodiment of the present utility model described in description above, various illustrations are not to this practicality
New substantive content is construed as limiting, and person of an ordinary skill in the technical field can be to former institute after specification has been read
The embodiment stated is made an amendment or deformed, without departing from the spirit and scope of utility model.
Claims (2)
- A kind of 1. device for inverse electromotive force when eliminating sweep test coil resistance, it is characterised in that：Including be connected to after The high-end discharge circuit driven with electric current between low side of electric current driving of electrical equipment array；Described discharge circuit includes electric discharge relay Device；The electric current of described electric discharge relay drives the electric current driving of high-end connection relay array high-end；The electricity of electric discharge relay The electric current driving low side of stream driving low side connection relay array；The control signal pin connection CPU of described electric discharge relay.
- 2. a kind of device for inverse electromotive force when eliminating sweep test coil resistance as claimed in claim 1, its feature It is：During channel measurement, closure electric discharge relay, the electric current of relay array is set to drive shape between the high-end driving low side with electric current Into short circuit；After the completion of the measurement current discharge of tested perceptual device, electric discharge relay is disconnected, and close putting for next TCH test channel Electrical relay, start next channel measurement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720791296.2U CN206975118U (en) | 2017-06-30 | 2017-06-30 | A kind of device for inverse electromotive force when eliminating sweep test coil resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720791296.2U CN206975118U (en) | 2017-06-30 | 2017-06-30 | A kind of device for inverse electromotive force when eliminating sweep test coil resistance |
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| Publication Number | Publication Date |
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| CN206975118U true CN206975118U (en) | 2018-02-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107340429A (en) * | 2017-06-30 | 2017-11-10 | 常州同惠电子股份有限公司 | The method and device of inverse electromotive force during for eliminating sweep test coil resistance |
-
2017
- 2017-06-30 CN CN201720791296.2U patent/CN206975118U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107340429A (en) * | 2017-06-30 | 2017-11-10 | 常州同惠电子股份有限公司 | The method and device of inverse electromotive force during for eliminating sweep test coil resistance |
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