CN202405999U - Frequency converter and voltage-to-current converting circuit - Google Patents
Frequency converter and voltage-to-current converting circuit Download PDFInfo
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- CN202405999U CN202405999U CN2011205055680U CN201120505568U CN202405999U CN 202405999 U CN202405999 U CN 202405999U CN 2011205055680 U CN2011205055680 U CN 2011205055680U CN 201120505568 U CN201120505568 U CN 201120505568U CN 202405999 U CN202405999 U CN 202405999U
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Abstract
The utility model relates to a frequency converter and a voltage-to-current converting circuit. The voltage-to-current converting circuit comprises an amplifier, a switching tube and an electric bridge consisting of a plurality of resistors, and is capable of converting a voltage signal Vin acquired at an input end into a current signal at an output end OUT, such that the output end OUT can serve as a positive electrode of a current source. The voltage-to-current converting circuit can be used for being connected with a communication port of a monitoring system to realize global monitoring, and can also be expanded and connected with other external devices according to needs of users so as to provide analog current signals to the other external devices.
Description
Technical field
The utility model relates to a kind of conversion circuit, and particularly relating to a kind of voltage that is used for frequency converter changes current circuit.
Background technology
Frequency converter is when driving motor and normally move, and the vicissitudinous real-time current of motor internal, frequency converter can be caught outside other the connection device of the monitoring of electric current supply frequency converter monitoring module or the expansion of motor.
In the actual use of frequency converter; The user is in order to realize the real-time monitoring to on-the-spot multiple electric motors; Communication in monitoring system may be called the electric current and the voltage parameter of multiple electric motors, so need obtain the real-time relevant parameter of motor operation from its control of conversion device.
The utility model content
The purpose of the utility model is to provide a kind of voltage to change the circuit of electric current; To make things convenient for the user to call the real-time current and the voltage parameter of the motor under the operating state; Both can be used to connect the communication port realization global monitoring of supervisory control system; Also can be according to user's oneself demand, expansion connects outside other equipment, for other external equipments provide current analog amount signal.
The utility model is achieved in that
A kind of voltage changes current circuit, comprising:
Resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, an operational amplifier and a switching tube;
The in-phase input end of said operational amplifier connects the input that said voltage changes current circuit through said resistance R 2; The inverting input of said operational amplifier is through said resistance R 1 ground connection; The positive power source terminal of said operational amplifier and negative power end connect positive and negative power supply respectively; The output of said operational amplifier connects said control end of switching tube through said resistance R 5; The high potential termination power supply of said switching tube, first end of the said resistance R 6 of electronegative potential termination of said switching tube, second end of said resistance R 6 are outputs that said voltage changes current circuit; Said resistance R 4 is connected between second end of in-phase input end and said resistance R 6 of said operational amplifier, and said resistance R 3 is connected between first end of inverting input and said resistance R 6 of said operational amplifier.
Another purpose of the utility model is to provide a kind of frequency converter, and described frequency converter comprises that above-mentioned voltage changes the current work circuit, and this kind frequency converter can be realized the real-time monitoring to electric machine operation state, can drive external load and equipment better.
Description of drawings
The voltage that Fig. 1 shows the utility model first embodiment to be provided changes the structure chart of current circuit;
The voltage that Fig. 2 shows the utility model second embodiment to be provided changes the structure chart of current circuit.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
The voltage that Fig. 1 shows the utility model first embodiment to be provided changes the structure chart of current circuit, and is as shown in the figure, and a kind of voltage changes current circuit, comprising:
Resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, an operational amplifier and a switching tube 100;
The in-phase input end of operational amplifier connects the input that voltage changes current circuit through resistance R 2; The inverting input of operational amplifier is through resistance R 1 ground connection; The positive power source terminal of operational amplifier and negative power end connect positive and negative power supply respectively; The output of operational amplifier connects the control end of switching tube 100 through resistance R 5; The high potential termination power supply of switching tube 100, first end of the cold end connecting resistance R6 of switching tube 100, second end of resistance R 6 are outputs that voltage changes current circuit; Resistance R 4 is connected between second end of in-phase input end and resistance R 6 of operational amplifier, and resistance R 3 is connected between first end of inverting input and resistance R 6 of operational amplifier.
The selection of operational amplifier mainly confirms that according to the concrete applied environment of this voltage commentaries on classics current circuit general qualified operational amplifier can both be applicable to the connection of this circuit.First embodiment as the utility model; Operational amplifier adopts LF347; Switching tube 100 adopts NPN type triode Q1; Wherein the base stage of NPN type triode Q1 is the control end of switching tube 100, and the current collection of NPN type triode Q1 is the hot end of switching tube 100 very, and the emission of NPN type triode Q1 is the cold end of switching tube 100 very.The circuit structure of this embodiment is: the in-phase input end 3 of operational amplifier LF347 meets the input Vin that voltage changes current circuit through resistance R 2; Vin is that input voltage is a voltage to be converted; The inverting input 2 of operational amplifier LF347 is through resistance R 1 ground connection; Positive supply termination+15V voltage of operational amplifier LF347, negative supply termination-15V voltage; The output 1 of operational amplifier LF347 connects the base stage of NPN type triode Q1 through resistance R 5; The collector electrode of NPN type triode Q1 connects+15V voltage, and first end of the emitter connecting resistance R6 of NPN type triode Q1, second end of resistance R 6 are output OUT that this voltage changes current circuit; Resistance R 4 is connected between second end of in-phase input end 3 and resistance R 6 of operational amplifier LF347, and resistance R 3 is connected between first end of inverting input 2 and resistance R 6 of operational amplifier LF347.
The voltage that Fig. 2 shows the utility model second embodiment to be provided changes the structure chart of current circuit; As shown in the figure; The voltage that provides with first embodiment change current circuit different be: said switching tube 100 adopts N type metal-oxide-semiconductor Q2, and the grid of N type metal-oxide-semiconductor Q2 is the control end of switching tube 100; The drain electrode of N type metal-oxide-semiconductor Q2 is the hot end of switching tube 100, and the source electrode of N type metal-oxide-semiconductor Q2 is the cold end of switching tube 100.
In addition, the utility model also provides a kind of frequency converter, and this kind frequency converter comprises that a voltage changes current circuit, and said voltage changes current circuit and comprises:
Resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, an operational amplifier and a switching tube 100;
The in-phase input end of said operational amplifier connects the input that said voltage changes current circuit through said resistance R 2; The inverting input of said operational amplifier is through said resistance R 1 ground connection; The positive power source terminal of said operational amplifier and negative power end connect positive and negative power supply respectively; The output of said operational amplifier connects the control end of said switching tube 100 through said resistance R 5; The high potential termination power supply of said switching tube 100, first end of the said resistance R 6 of electronegative potential termination of said switching tube 100, second end of said resistance R 6 are outputs that said voltage changes current circuit; Said resistance R 4 is connected between second end of in-phase input end and said resistance R 6 of said operational amplifier, and said resistance R 3 is connected between first end of inverting input and said resistance R 6 of said operational amplifier.
First, second embodiment is corresponding with the utility model, and the operational amplifier that the voltage in the frequency converter changes in the current circuit adopts LF347, and said switching tube 100 can adopt NPN type triode or N type metal-oxide-semiconductor.When switching tube 100 was NPN type triode, the base stage of NPN type triode was a control end of switching tube, and the current collection of NPN type triode is the hot end of switching tube very, and the emission of NPN type triode is the cold end of switching tube very; When switching tube 100 adopted N type metal-oxide-semiconductor, the grid of N type metal-oxide-semiconductor was a control end of switching tube, and the drain electrode of N type metal-oxide-semiconductor is the hot end of switching tube, and the source electrode of N type metal-oxide-semiconductor is the cold end of switching tube.
It is example that the voltage that provides with the utility model first embodiment below changes current circuit, the operation principle of this voltage commentaries on classics current circuit is done specifying.The voltage that first embodiment provides changes current circuit; Can the voltage signal Vin that the input port obtains be changed into the current signal of output OUT; So can output OUT be regarded as the positive pole of a current source, both can be used to connect the communication port realization global monitoring of supervisory control system, also can be according to user's oneself demand; Expansion connects outside other equipment, for other external equipments provide current analog amount signal.Present embodiment is with specific parameter value: the Vin input voltage is 0V-3V, and the OUT output current is 0mA-20mA, the function on plain telegram road.
Voltage signal is got into by Vin, at first gets into operational amplifier LF347.The positive supply port of operational amplifier LF347 connects+15V voltage; The negative supply port connects-15V voltage, because operational amplifier LF347 is in saturation condition basically under the negative feedback state, so the electric current that flows through is very little; So " empty short " and " empty disconnected " arranged; Empty short, promptly the electric current of the electric current of operational amplifier LF347 No. 2 ports and No. 3 ports can be ignored basically, all equals zero; Empty disconnected, promptly the voltage of operational amplifier LF347 No. 2 ports and No. 3 ports equates.The base stage of the output termination triode Q1 of operational amplifier LF347 is through the relatively variation of the variation control triode Q1 base current of Vin; The collector electrode of triode Q1 connects+the 15V power supply; Because the electric current that operational amplifier LF347 flows through under the negative feedback state is very little; Can not play the purpose that power supply is provided for load; Can only make it as a control signal, be reached for the purpose that output provides power supply through the size of current of controlling triode Q1, so triode Q1 has also played the effect of drive circuit.
If the voltage of the positive and negative phase input of operational amplifier LF347 is respectively V
P, V
N, according to negative-feedback circuit " empty short " and the condition of " empty disconnected " and KCL, the KVL principle of circuit, can obtain following equation group:
Wherein, V '
O, V
OBe respectively two voltages at nodes as shown in the figure.Get R1=R2; R3=R4, separating top equation group can get:
flows through the electric current
of R6
Because it is 0V-3V that the voltage that present embodiment provides commentaries on classics current circuit requires the magnitude of voltage of input voltage vin; Requiring the electric current of OUT output port output is 0mA-20mA; Then to get
whole, and device parameter values that voltage changes in the current circuit is: R1=30K Ω; R2=30K Ω; R3=10K Ω; R4=10K Ω, R5=3K Ω, R6=50 Ω; Then the voltage of output is 10V to the maximum;
then should add the resistance of one 500 Ω if the OUT output port need be exported the voltage of 10V between OUT output port and ground, could guarantee that like this output voltage is 10V.
Certainly, input voltage vin is changed into current signal or voltage signal, can independently select according to user's needs.When needing the voltage signal of the different sizes of output, just can achieve the goal, this no longer tired stating through the resistance that changes output port.
The voltage that the utility model provides changes the electric bridge that current circuit comprises that an operational amplifier, a switching tube and several resistance are formed; Can the voltage signal Vin that the input port obtains be changed into the current signal of output OUT; So can output OUT be regarded as the positive pole of a current source, both can be used to connect the communication port realization global monitoring of supervisory control system, also can be according to user's oneself demand; Expansion connects outside other equipment, for other external equipments provide current analog amount signal.
The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection range of the utility model.
Claims (8)
1. a voltage changes current circuit, it is characterized in that, said voltage changes current circuit and comprises:
Resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, an operational amplifier and a switching tube;
The in-phase input end of said operational amplifier connects the input that said voltage changes current circuit through said resistance R 2; The inverting input of said operational amplifier is through said resistance R 1 ground connection; The positive power source terminal of said operational amplifier and negative power end connect positive and negative power supply respectively; The output of said operational amplifier connects said control end of switching tube through said resistance R 5; The high potential termination power supply of said switching tube, first end of the said resistance R 6 of electronegative potential termination of said switching tube, second end of said resistance R 6 are outputs that said voltage changes current circuit; Said resistance R 4 is connected between second end of in-phase input end and said resistance R 6 of said operational amplifier, and said resistance R 3 is connected between first end of inverting input and said resistance R 6 of said operational amplifier.
2. voltage as claimed in claim 1 changes current circuit, it is characterized in that described operational amplifier is LF347.
3. according to claim 1 or claim 2 voltage changes current circuit; It is characterized in that; Described switching tube is NPN type triode Q1; The base stage of said NPN type triode Q1 is said control end of switching tube, the hot end of the very said switching tube of current collection of said NPN type triode Q1, the cold end of the very said switching tube of emission of said NPN type triode Q1.
4. according to claim 1 or claim 2 voltage changes current circuit; It is characterized in that; Described switching tube is N type metal-oxide-semiconductor Q2; The grid of said N type metal-oxide-semiconductor Q2 is said control end of switching tube, and the drain electrode of said N type metal-oxide-semiconductor Q2 is the hot end of said switching tube, and the source electrode of said N type metal-oxide-semiconductor Q2 is the cold end of said switching tube.
5. a frequency converter is characterized in that, comprises that a voltage changes current circuit, and said voltage changes current circuit and comprises:
Resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, an operational amplifier and a switching tube;
The in-phase input end of said operational amplifier connects the input that said voltage changes current circuit through said resistance R 2; The inverting input of said operational amplifier is through said resistance R 1 ground connection; The positive power source terminal of said operational amplifier and negative power end connect positive and negative power supply respectively; The output of said operational amplifier connects said control end of switching tube through said resistance R 5; The high potential termination power supply of said switching tube, first end of the said resistance R 6 of electronegative potential termination of said switching tube, second end of said resistance R 6 are outputs that said voltage changes current circuit; Said resistance R 4 is connected between second end of in-phase input end and said resistance R 6 of said operational amplifier, and said resistance R 3 is connected between first end of inverting input and said resistance R 6 of said operational amplifier.
6. frequency converter as claimed in claim 5 is characterized in that, described operational amplifier is LF347.
7. like claim 5 or 6 described frequency converters; It is characterized in that; Described switching tube is NPN type triode Q1; The base stage of said NPN type triode Q1 is said control end of switching tube, the hot end of the very said switching tube of current collection of said NPN type triode Q1, the cold end of the very said switching tube of emission of said NPN type triode Q1.
8. like claim 5 or 6 described frequency converters; It is characterized in that; Described switching tube is N type metal-oxide-semiconductor Q2; The grid of said N type metal-oxide-semiconductor Q2 is said control end of switching tube, and the drain electrode of said N type metal-oxide-semiconductor Q2 is the hot end of said switching tube, and the source electrode of said N type metal-oxide-semiconductor Q2 is the cold end of said switching tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205055680U CN202405999U (en) | 2011-12-07 | 2011-12-07 | Frequency converter and voltage-to-current converting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205055680U CN202405999U (en) | 2011-12-07 | 2011-12-07 | Frequency converter and voltage-to-current converting circuit |
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| Publication Number | Publication Date |
|---|---|
| CN202405999U true CN202405999U (en) | 2012-08-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205055680U Expired - Fee Related CN202405999U (en) | 2011-12-07 | 2011-12-07 | Frequency converter and voltage-to-current converting circuit |
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| CN (1) | CN202405999U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108062054A (en) * | 2017-12-22 | 2018-05-22 | 深圳市英威腾电气股份有限公司 | A kind of analog signals output circuit |
-
2011
- 2011-12-07 CN CN2011205055680U patent/CN202405999U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108062054A (en) * | 2017-12-22 | 2018-05-22 | 深圳市英威腾电气股份有限公司 | A kind of analog signals output circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: SHENZHEN SINE ELECTRIC CO., LTD. Free format text: FORMER NAME: SHENZHEN ZHENGXUAN ELECTRIC APPLIANCE CO., LTD. |
|
| CP03 | Change of name, title or address |
Address after: A Longjing second industrial zone five road 518055 Guangdong city of Shenzhen province Nanshan District Dragon Building 5 floor Patentee after: Shenzhen Sine Electric Co., Ltd. Address before: 3 D building, building five, Longjing second industrial zone, Pearl Dragon Road, Nanshan District, Shenzhen, Guangdong 518000, China Patentee before: Shenzhen Zhengxuan Electric Co.,Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120829 Termination date: 20141207 |
|
| EXPY | Termination of patent right or utility model |