CN203851013U - AC/DC signal circuit dual-purpose filter - Google Patents
AC/DC signal circuit dual-purpose filter Download PDFInfo
- Publication number
- CN203851013U CN203851013U CN201420174319.1U CN201420174319U CN203851013U CN 203851013 U CN203851013 U CN 203851013U CN 201420174319 U CN201420174319 U CN 201420174319U CN 203851013 U CN203851013 U CN 203851013U
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- filter
- signal circuit
- common mode
- electric capacity
- dual
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- 239000003990 capacitor Substances 0.000 abstract description 4
- 238000001914 filtration Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 3
- 230000001131 transforming effect Effects 0.000 description 3
- 239000012467 final product Substances 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
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Abstract
The utility model belongs to the technical field of signal circuits, and specifically relates to an AC/DC signal circuit dual-purpose filter. The AC/DC signal circuit dual-purpose filter successively comprises filter input terminals, common mode inductors and filter output terminals along a signal transmitting direction; the filter input terminals are connected with input terminals of the common mode inductors; output terminals of the common mode inductors are connected with the filter output terminals; and a capacitor is bridged between the output terminals of the common mode inductors, the capacitor is in series connection with a controller, and the controller can control the capacitor to be connected to or disconnected from the circuit. The same filter is used, the circuit structure can be changed only by simple operation, so that the filter can be applied to a DC signal circuit and can also be applied to a high-frequency AC signal circuit, and the AC/DC signal circuit dual-purpose filter has the characteristics of simple structure, high practicality and convenient use.
Description
Technical field
The utility model belongs to signal circuit technical field, is specifically related to one and both can in high frequency ac signal circuit, uses, the dual-purpose filter of alternating current-direct current signal circuit that also can use in direct current signal circuit.
Background technology
Because some industrial signal, as high pressure, overcurrent, surge etc., can not correctly be identified by system, must could gather by adjusting.Signal circuit is the acquisition system that industrial signal is converted to a set of complete data by collecting device, and by being directly connected to, transducer and output signal (from thermocouple to high voltage signal) widely realize for it.Crucial signal condition technology can improve 10 times by the overall performance of data acquisition system and precision.Therefore, signal circuit briefly converts measured signal to standard signal that collecting device can be identified by operations such as amplification, filtering exactly, it utilizes inner circuit, comprises that filter, transducer, amplifier etc. change the signal kind of input and export it.
Have and above-mentionedly introduce knownly, signal circuit is according to the alternating current-direct current difference of power supply, needs to adopt the filter that is applicable to the filter of alternating current circuit or is applicable to DC circuit.Although this is owing to there being common mode inductance in filter, be applicable to other member differences of the filter of AC-DC Circuit.In high frequency ac signal circuit, can not be at the output flying capcitor of common mode inductance, otherwise can cause dropout, so that the signal transforming transmits less than signal receiving end, gathers unsuccessfully; But the general output flying capcitor at common mode inductance in direct current signal circuit, now flying capcitor can very effective filtering differential mode noise.As Chinese invention patent application CN 102088188 A disclose " a kind of DC wave filter ", the differential mode filter network of this filter comprises two differential mode capacitor CX1, and CX2 can filtering differential mode High-frequency Interference.But this filter can not be applied in high frequency ac signal circuit.
For these reasons, be applied to the filter of signal circuit in prior art, be divided into two kinds of models, a kind of model is applicable to the signal circuit that power supply is high-frequency alternating current, and it is galvanic signal circuit that a kind of model is applicable to power supply.So just cause increasing of filter model, the filter applicability of every kind of model is not strong, is inconvenient to use.
Utility model content
For addressing the above problem, the purpose of this utility model is to provide a kind of alternating current-direct current signal circuit dual-purpose filter, it adopts with a filter, only get final product translation circuit structure by simple operations, make it can be applicable to direct current signal circuit and can be applicable to again high frequency ac signal circuit, there is feature simple in structure, practical and easy to use.
The technical solution of the utility model is: the dual-purpose filter of a kind of alternating current-direct current signal circuit, flow to along signal, and comprise successively filter input end, common mode inductance and filter output; Filter input end is connected with common mode inductance input, and common mode inductance output is connected with filter output; Cross-over connection one electric capacity between common mode inductance output, it also comprises controller, described controller can control capacitance place in circuit or disconnection.
Optimize, described controller adopts the switch that contains short circuit sheet with capacitances in series.
Optimize, described electric capacity is X electric capacity.
Optimize, controller is connected on the input of electric capacity or is connected on the output of electric capacity or at the electric capacity input/output terminal controller of connecting respectively.
Can be found out by accompanying drawing, described in the utility model between common mode inductance output cross-over connection one electric capacity, i.e. cross-over connection one electric capacity between filter output.
Can control capacitance place in circuit or disconnection due to controller, the dual-purpose filter that therefore the utility model provides has versatility:
When the dual-purpose filter that the utility model is provided is arranged in high frequency ac signal circuit, by controller, electric capacity and circuit are disconnected, not only can be disturbed by common mode inductance filtering common mode, and the no longer flying capcitor of output of the rear common mode inductance of disconnection, can not cause dropout, the signal transforming can be transferred to signal receiving end smoothly, successfully gathers.
When the dual-purpose filter that the utility model is provided is arranged in direct current signal circuit, by controller by electric capacity place in circuit, now electric capacity is connected across the output of common mode inductance, by electric capacity filtering differential mode interference, effectively filtering differential mode noise.
The beneficial effects of the utility model are in sum:
1, the dual-purpose filter that adopts the utility model to provide, can solve and exchange and direct current two class signal transmission issues, it only gets final product translation circuit structure by simple operations, make it can be applicable to direct current signal circuit and can be applicable to again high frequency ac signal circuit, there is feature simple in structure, practical and easy to use.
2, no matter the dual-purpose filter that adopts the utility model to provide is in the signal circuit of DC power supply or in the signal circuit of AC power, all to play the effect that filtering common mode disturbs.
3, controller of the present utility model can adopt the switch that contains short circuit sheet, simple in structure, and material is easy to get.
4, electric capacity of the present utility model adopts X electric capacity, and capacity is large and safe.
5, controller can be connected on the input of electric capacity or be connected on the output of electric capacity or at the electric capacity input/output terminal controller of connecting respectively, mode is flexible, easy to use.
Brief description of the drawings
Fig. 1 is the first execution mode schematic diagram of the utility model filter;
Fig. 2 is the second execution mode schematic diagram of the utility model filter;
Fig. 3 is the third execution mode schematic diagram of the utility model filter.
Lcm: common mode inductance; Input: filter input end; Output: filter output; Cx: electric capacity; S: controller.
Embodiment
Illustrate the utility model below in conjunction with drawings and Examples.
Embodiment 1
The dual-purpose filter of alternating current-direct current signal circuit that the present embodiment provides, flows to along signal, comprises successively filter input end, common mode inductance and filter output; Filter input end is connected with common mode inductance input, and common mode inductance output is connected with filter output; Cross-over connection one electric capacity between common mode inductance output, and electric capacity connects with controller, and described controller can control capacitance place in circuit or disconnection.
Wherein, described controller adopts the switch that contains short circuit sheet.
Wherein, described electric capacity is X electric capacity.
Wherein, controller is connected on the input of electric capacity.
Embodiment 2
The difference of the present embodiment and embodiment 1 is that the switch series that contains short circuit sheet is associated in the output of electric capacity.
Embodiment 3
The present embodiment and the difference of embodiment 1 are at the electric capacity input/output terminal switch that contains short circuit sheet of connecting respectively.
Can control capacitance place in circuit or disconnection due to controller, the dual-purpose filter that therefore the utility model provides has versatility:
When the dual-purpose filter that the utility model is provided is arranged in high frequency ac signal circuit, by controller, electric capacity and circuit are disconnected, not only can be disturbed by common mode inductance filtering common mode, and the no longer flying capcitor of output of the rear common mode inductance of disconnection, can not cause dropout, the signal transforming can be transferred to signal receiving end smoothly, successfully gathers.
When the dual-purpose filter that the utility model is provided is arranged in direct current signal circuit, by controller by electric capacity place in circuit, now electric capacity is connected across the output of common mode inductance, by electric capacity filtering differential mode interference, effectively filtering differential mode noise.
Claims (4)
1. the dual-purpose filter of alternating current-direct current signal circuit, flows to along signal, comprises successively filter input end, common mode inductance and filter output; Filter input end is connected with common mode inductance input, and common mode inductance output is connected with filter output; It is characterized in that: cross-over connection one electric capacity between common mode inductance output, it also comprises controller, described controller can control capacitance place in circuit or disconnection.
2. the dual-purpose filter of alternating current-direct current signal circuit according to claim 1, is characterized in that: described controller adopts the switch that contains short circuit sheet with capacitances in series.
3. the dual-purpose filter of alternating current-direct current signal circuit according to claim 2, is characterized in that: described electric capacity is X electric capacity.
4. the dual-purpose filter of alternating current-direct current signal circuit according to claim 3, is characterized in that: controller is connected on the input of electric capacity or is connected on the output of electric capacity or at the electric capacity input/output terminal controller of connecting respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420174319.1U CN203851013U (en) | 2014-04-11 | 2014-04-11 | AC/DC signal circuit dual-purpose filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420174319.1U CN203851013U (en) | 2014-04-11 | 2014-04-11 | AC/DC signal circuit dual-purpose filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203851013U true CN203851013U (en) | 2014-09-24 |
Family
ID=51563983
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420174319.1U Expired - Lifetime CN203851013U (en) | 2014-04-11 | 2014-04-11 | AC/DC signal circuit dual-purpose filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203851013U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105867225A (en) * | 2016-04-13 | 2016-08-17 | 广州市联特电子科技有限公司 | Load control circuit and control method thereof |
-
2014
- 2014-04-11 CN CN201420174319.1U patent/CN203851013U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105867225A (en) * | 2016-04-13 | 2016-08-17 | 广州市联特电子科技有限公司 | Load control circuit and control method thereof |
| CN105867225B (en) * | 2016-04-13 | 2018-08-10 | 广州市联特电子科技有限公司 | Load control circuit and its control method |
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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: 20140924 |