CN201349176Y - Voltage-current signal convention circuit for frequency converter - Google Patents
Voltage-current signal convention circuit for frequency converter Download PDFInfo
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- CN201349176Y CN201349176Y CNU2008201575114U CN200820157511U CN201349176Y CN 201349176 Y CN201349176 Y CN 201349176Y CN U2008201575114 U CNU2008201575114 U CN U2008201575114U CN 200820157511 U CN200820157511 U CN 200820157511U CN 201349176 Y CN201349176 Y CN 201349176Y
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Abstract
The utility model relates to a voltage-current signal convention circuit for a frequency converter. In the conventional structure, two input ports need to be reserved on a digital signal processor in order to respectively receive voltage signals and current signals. The voltage-current signal convention circuit provided by the utility model consists of a signal conditioning circuit and a jumper; wherein the signal conditioning circuit comprises an input end for receiving input signals and a signal output end, and is used to condition the input signals; the jumper is provided with a first pin, a second pin and a third pin; the first pin is earthed through a resistor; the second pin is connected with the input end of the signal conditioning circuit; and the third pin is unconnected. In the utility model, no matter the input signal is a voltage signal or a current signal, the signal conditioning circuit finally has only one signal output end through the selection of the jumper, consequently, only one input end of the digital signal processor needs to be occupied in order to set the operation frequency of the frequency converter, and thereby the hardware resource of the system is saved.
Description
Technical field
The utility model relates to frequency converter, relates in particular to the voltage and current signal change-over circuit that uses in a kind of frequency converter.
Background technology
AC converter is widely used in controlling asynchronous motor, and it is transformed to voltage, frequency with power frequency supply and becomes certain ratio to change, thereby realizes asynchronous motor is carried out accurately speed regulating control.
Frequency converter needs the analog signal of a setting frequency converter running frequency when work, this signal may be a voltage signal, also may be current signal.In traditional structure, need support with two road circuit, in digital signal processor (DSP), often need to reserve two input ports to receive voltage signal and current signal respectively simultaneously.Yet in practice, this two road signal not synchronous signal uses.
Practical content
The purpose of this utility model is to provide a kind of frequency converter voltage and current signal change-over circuit, needs two road circuit to handle the problem of current signal and voltage signal to solve in the frequency converter.
Frequency converter voltage and current signal change-over circuit of the present utility model comprises:
Signal conditioning circuit comprises an input and a signal output part that is used for receiving inputted signal, is used for input signal is nursed one's health processing; And
A jumper wire device, this jumper wire device have first, second and the three or three stitch, and first stitch is by a resistance-grounded system, and second stitch links to each other with the input of this signal conditioning circuit, and the 3rd stitch is unsettled.
In above-mentioned frequency converter voltage and current signal change-over circuit, this signal conditioning circuit comprises an operational amplifier.
As mentioned above, no matter input signal is voltage signal or current signal, selection by jumper wire device, finally make signal conditioning circuit have only a signal output part, therefore, correspondingly, digital signal processor only needs an input to get final product, realize the purpose of the running frequency of an input port setting frequency converter, saved the hardware resource of system.
Description of drawings
Fig. 1 shows the schematic diagram of frequency converter voltage and current signal change-over circuit of the present utility model.
Embodiment
As shown in Figure 1, frequency converter voltage and current signal change-over circuit of the present utility model comprises signal conditioning circuit 10.This signal conditioning circuit 10 has an input IN.At this input IN place, also be connected with a jumper wire device 20.
Jumper wire device 20 has first, second and the three or three stitch 1,2,3, the first stitch 1 pass through a resistance-grounded system, and second stitch 2 links to each other with the input of this signal conditioning circuit, and the 3rd stitch 3 is unsettled.
When the signal that receives as the input IN of signal conditioning circuit is voltage signal, with second and three stitch 2,3 short circuits of bouncing pilotage with jumper wire device 20, voltage signal is directly inputted in the signal conditioning circuit 10, processing through modulate circuit 10, directly offer digital signal processor DSP, thereby realize the setting of frequency converter running frequency.
When on the input I of signal conditioning circuit to signal when being power supply signal, with first and second stitch 1,2 short circuits of bouncing pilotage with jumper wire device 20, current signal is transformed to voltage signal through resistor R 1.What this moment, signal conditioning circuit 10 received still is voltage signal.This voltage signal directly offers digital signal processor DSP through the processing of modulate circuit 10, thereby realizes the setting of frequency converter running frequency.
In this example, signal conditioning circuit 10 can adopt conventional modulate circuit, and it can be made of an operational amplifier and several resistance, electric capacity.Its operation principle is that those of ordinary skills know, so no longer narration here.
As mentioned above, select input signal, simplified circuit design, realized setting the running frequency of frequency converter, saved the hardware resource of system with an input port by the bouncing pilotage of jumper wire device 20.
Claims (2)
1, a kind of frequency converter voltage and current signal change-over circuit is characterized in that, comprising:
Signal conditioning circuit comprises an input and a signal output part that is used for receiving inputted signal, is used for input signal is nursed one's health processing; And
A jumper wire device, this jumper wire device have first, second and the three or three stitch, and first stitch is by a resistance-grounded system, and second stitch links to each other with the input of this signal conditioning circuit, and the 3rd stitch is unsettled.
2, frequency converter voltage and current signal change-over circuit as claimed in claim 1 is characterized in that, this signal conditioning circuit comprises an operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201575114U CN201349176Y (en) | 2008-12-19 | 2008-12-19 | Voltage-current signal convention circuit for frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201575114U CN201349176Y (en) | 2008-12-19 | 2008-12-19 | Voltage-current signal convention circuit for frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201349176Y true CN201349176Y (en) | 2009-11-18 |
Family
ID=41368639
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201575114U Expired - Fee Related CN201349176Y (en) | 2008-12-19 | 2008-12-19 | Voltage-current signal convention circuit for frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201349176Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102394494A (en) * | 2011-09-28 | 2012-03-28 | 魏德米勒电联接国际贸易(上海)有限公司 | Current-voltage converting circuit provided with over-current protection circuit module |
| CN103246218A (en) * | 2013-04-25 | 2013-08-14 | 湘煤立达矿山装备股份有限公司 | Analog input following processing circuit for variable-frequency governor |
| CN105242595A (en) * | 2015-09-28 | 2016-01-13 | 深圳市易驱电气有限公司 | Switching device and switching method for analog input signals |
-
2008
- 2008-12-19 CN CNU2008201575114U patent/CN201349176Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102394494A (en) * | 2011-09-28 | 2012-03-28 | 魏德米勒电联接国际贸易(上海)有限公司 | Current-voltage converting circuit provided with over-current protection circuit module |
| CN103246218A (en) * | 2013-04-25 | 2013-08-14 | 湘煤立达矿山装备股份有限公司 | Analog input following processing circuit for variable-frequency governor |
| CN105242595A (en) * | 2015-09-28 | 2016-01-13 | 深圳市易驱电气有限公司 | Switching device and switching method for analog input signals |
| CN105242595B (en) * | 2015-09-28 | 2018-05-15 | 深圳市易驱电气有限公司 | Switching device and switching method for analog input signals |
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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: 20091118 Termination date: 20141219 |
|
| EXPY | Termination of patent right or utility model |