CN219716005U - Analog output circuit for frequency converter - Google Patents
Analog output circuit for frequency converter Download PDFInfo
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- CN219716005U CN219716005U CN202320639726.4U CN202320639726U CN219716005U CN 219716005 U CN219716005 U CN 219716005U CN 202320639726 U CN202320639726 U CN 202320639726U CN 219716005 U CN219716005 U CN 219716005U
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Abstract
The utility model relates to an analog output circuit for a frequency converter, which comprises a voltage type analog output circuit and a current type analog output circuit, and is characterized in that: the voltage type analog output circuit is composed of a first sampling circuit and a voltage amplifying circuit, the current type analog output circuit is composed of a second sampling circuit and a current amplifying circuit, the first sampling circuit and the second sampling circuit are used for converting a current source into a voltage source, the voltage amplifying circuit amplifies and outputs the voltage source, and the current amplifying circuit converts the voltage source into the current source and outputs the current source. The analog quantity output circuit for the frequency converter can realize the output of 0-10V voltage type analog quantity or 0-20mA current type analog quantity at the same terminal, saves space, reduces cost, has high switching efficiency, is convenient and quick, and is safe to operate.
Description
Technical Field
The utility model relates to the technical field of electronics, in particular to an analog output circuit for a frequency converter.
Background
In the using process of the frequency converter, information such as the rotating speed, the frequency, the current, the motor torque and the motor power of the motor may need to be output, and the information may be transmitted in an analog quantity mode, in some situations, the rotating speed, the frequency, the current, the motor torque and the motor power of the motor need to be converted into voltage type analog quantities for output, and in some situations, the rotating speed, the frequency, the current, the motor torque and the motor power of the motor need to be converted into current type analog quantities for output.
The current implementation scheme is characterized in that the voltage type analog quantity and the current type analog quantity are respectively output, and by utilizing two output terminals, under the trend of miniaturization of the frequency converter, more functions are obviously realized by not fully utilizing limited space.
Disclosure of Invention
In order to overcome the defects of the technical problems, the utility model provides an analog output circuit for a frequency converter.
The utility model relates to an analog quantity output circuit for a frequency converter, which comprises a voltage type analog quantity output circuit and a current type analog quantity output circuit, wherein the input ends of the voltage type analog quantity output circuit and the current type analog quantity output circuit are selectively connected to an analog input signal Iin to be converted; the method is characterized in that: the voltage type analog quantity output circuit is composed of a first sampling circuit and a voltage amplifying circuit, the current type analog quantity output circuit is composed of a second sampling circuit and a current amplifying circuit, the first sampling circuit and the second sampling circuit are selectively connected to the same analog input signal Iin, the first sampling circuit and the second sampling circuit are used for converting a current source into a voltage source, the voltage amplifying circuit amplifies and outputs the voltage source, and the current amplifying circuit converts the voltage source into the current source for outputting; the output end of the voltage amplifying circuit is connected with the output end of the current amplifying circuit and is used for outputting a voltage type or current type output signal Uo.
The utility model relates to an analog output circuit for a frequency converter, which is characterized in that the first sampling circuit is composed of a first sampling resistor R4 and a capacitor C3 connected in parallel with the first sampling resistor R4, the voltage amplification circuit is composed of an operational amplifier N1A, a resistor R1, a resistor R2, a resistor R3, a resistor R5, a resistor R6, a capacitor C1, a capacitor C2 and a capacitor C4, two ends of the resistor R4 are respectively connected to an analog input signal Iin and a power ground GND, one end of the resistor R1 connected in series with the resistor R2 is connected to a non-grounding end of the resistor R4, the other end of the resistor R1 is connected to a non-inverting input end of the operational amplifier N1A, two ends of the capacitor C4 are respectively connected to the power ground GND and an inverting input end of the operational amplifier N1A, and two ends of the resistor R5 are respectively connected to the power ground GND and the inverting input end of the operational amplifier N1A; one end of the resistor R3 is connected to the output end of the operational amplifier N1A, and the other end of the resistor R3 is respectively connected to the inverting input end of the operational amplifier N1A and the junction of the resistor R1 and the resistor R2 through the resistor R6 and the capacitor C1; the junction of the resistor R3 and the resistor R6 forms a voltage type signal output end.
The utility model relates to an analog output circuit for a frequency converter, which is composed of a second sampling resistor R11 and a capacitor C8 connected in parallel with the second sampling resistor R11, wherein a current amplifying circuit is composed of an operational amplifier N1B, NPN triode T1, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R12, a resistor R13 and a resistor R14, two ends of the resistor R11 are respectively connected with an analog input signal Iin and a power ground GND, two ends of the resistor R9 are respectively connected with a non-grounding end of the resistor R11 and a non-inverting input end of the operational amplifier N1B, the resistor R7 is connected in parallel with the resistor R9, the non-inverting input end of the operational amplifier N1B is connected with an inverting input end of the operational amplifier N1B through the resistor R8, the resistor R14 and the resistor R13, and two ends of the resistor R12 are respectively connected with the power ground GND and the inverting input end of the operational amplifier N1B; the output end of the operational amplifier N1B is connected to the base electrode of the triode T1 through a resistor R10, the collector electrode of the triode T1 is connected to the positive electrode of the power supply, the emitter electrode of the triode T1 is connected to the joint of the resistor R13 and the resistor R14, and the joint of the resistor R14 and the resistor R8 forms a current type signal output end.
According to the analog output circuit for the frequency converter, the resistance values of the resistor R1, the resistor R2 and the resistor R6 are equal, and the resistance values of the resistor R8, the resistor R9, the resistor R12 and the resistor R13 are equal.
The utility model relates to an analog output circuit for a frequency converter, which comprises an anti-reverse connection circuit formed by a series diode group D1 and a series diode group D2, wherein the series diode group D1 and the series diode group D2 are formed by two diodes which are sequentially connected in series, the voltage signal output end of a voltage amplifying circuit is connected to the positive electrode of the series diode group D1, the negative electrode of the series diode group D1 is connected to the positive electrode of a power supply, the current signal output end of the current amplifying circuit is connected to the middle wiring terminal of the series diode group D2, and the positive electrode of the series diode group D2 is connected to the ground of the power supply; the intermediate terminal of the series diode group D1 is connected to the negative pole of the series diode group D2 and forms the output of the voltage-type or current-type output signal Uo.
According to the analog output circuit for the frequency converter, the power supply anode and the power supply cathode of the operational amplifier N1A are respectively connected to the power supply ground through the capacitor C5 and the capacitor C2, and the collector of the triode T1 is connected to the power supply ground GND through the capacitor C7.
The beneficial effects of the utility model are as follows: the utility model relates to an analog quantity output circuit for a frequency converter, which is provided with a voltage analog quantity output circuit formed by a first sampling circuit and a voltage amplifying circuit and a current analog quantity output circuit formed by a second sampling circuit and a current amplifying circuit, wherein the first sampling circuit and the second sampling circuit are selectively connected to the same analog input signal Iin (such as by switching through a function code) and convert a current source into a voltage source, the voltage amplifying circuit amplifies and outputs the voltage source, and the current amplifying circuit converts the voltage source into the current source for output; the voltage value of the output end of the voltage amplifying circuit and the voltage at two ends of the sampling resistor are in linear change, the output voltage is regulated by regulating the voltage at two ends of the sampling resistor, and the current amplifying circuit can regulate different current output ranges by setting different regulating resistors; the output of the 0-10V voltage type analog quantity or the 0-20mA current type analog quantity at the same terminal is realized, the space is saved, the cost is reduced, the switching efficiency is high, the operation is convenient and quick, and the operation is safe.
Drawings
Fig. 1 is a circuit diagram of an analog output circuit for a frequency converter according to the present utility model.
In the figure: 1 first sampling resistor R4,2 operational amplifier N1A,3 second sampling resistor R11,4 operational amplifier N1B,5 triode T1; R1-R3, R5-R10, R12-R14 are resistors, C1-C8 are capacitors, and D1 and D2 are series diode groups.
Detailed Description
The utility model will be further described with reference to the drawings and examples.
As shown in fig. 1, a circuit diagram of an analog quantity output circuit for a frequency converter according to the present utility model is provided, which is composed of a voltage-type analog quantity output circuit and a current-type analog quantity output circuit, the input terminals of which are selectively connected to the same analog input signal Iin to be converted. The voltage type analog output circuit is composed of a first sampling circuit and a voltage amplifying circuit, and the current type analog output circuit is composed of a second sampling circuit and a current amplifying circuit. The first sampling circuit and the second sampling circuit are used for converting a current source into a voltage source, the voltage source is amplified and output by the voltage amplifying circuit, and the voltage source is converted into the current source by the current amplifying circuit to be output; the output end of the voltage amplifying circuit is connected with the output end of the current amplifying circuit and is used for outputting a voltage type or current type output signal Uo.
The first sampling circuit is composed of a resistor R4 and a capacitor C3 connected in parallel with the resistor R4, the voltage amplifying circuit is composed of an operational amplifier N1A, a resistor R1, a resistor R2, a resistor R3, a resistor R5, a resistor R6, a capacitor C1, a capacitor C2 and a capacitor C4, the resistor R3 is connected in parallel with the capacitor C3, one end of the voltage amplifying circuit is connected to an analog input signal Iin (such as a pin labeled IDAC_AOV on an MCU chip), and the other end of the voltage amplifying circuit is connected to a ground end GND. The resistors R1 and R2 are connected in series, one end of the resistor is connected to the non-grounding end of the resistor R4, the other end of the resistor is connected to the non-inverting input end of the operational amplifier N1A together with the capacitor C4, and the other end of the capacitor C4 is connected to the grounding end. One end of a resistor R3 is connected to the output end of the operational amplifier N1A, the other end of the resistor R3 is connected with a capacitor C1 and a resistor R6 together to be connected to an anode pin of the series diode group D1, one end of the capacitor C1 is connected between the resistor R1 and a resistor R2, the other end of the resistor R6 is connected with a resistor R5 together to be connected to the inverting input end of the No. 2 pin of the operational amplifier N1A, and the other end of the resistor R5 is connected to the grounding end.
The second sampling circuit is composed of a second sampling resistor R11 and a capacitor C8 connected in parallel with the second sampling resistor R11, and the current amplifying circuit is composed of an operational amplifier N1B, NPN type triode T1, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R12, a resistor R13 and a resistor R14. The resistor R11 is connected in parallel with the capacitor C8, one end of the resistor R11 is connected with the resistor R7 and the resistor R9 together on an analog input signal Iin (such as a pin marked as IDAC_AOI on an MCU chip), the other end of the resistor R7 is connected with the other end of the resistor R9 on a grounding end, the other ends of the resistor R7 and the resistor R9 are connected with a No. 5 pin of the operational amplifier N1B, namely a non-inverting input end, one end of the resistor R8 is also connected with the non-inverting input end of the operational amplifier, one end of the resistor R12 and one end of the resistor R13 are connected with an inverting input end of the operational amplifier together, the other end of the resistor R12 is connected with the grounding end, one end of the resistor R10 is connected with an output end of the operational amplifier N1B, and the other end of the resistor R10 is connected with a base pin of the triode T1. The collector pin of triode T1 is connected in +15V power, and the projecting pole pin is connected in the one end of resistance R13 and R14, and the other end of resistance R14 is connected in series diode D2's No. 3 pin together with the other end of resistance R8, and series diode D1's No. 3 pin is connected in output terminal department together with diode D2's No. 2 pin.
In the present utility model, the model of the operational amplifier N1 is TL082IDR, the models of the diodes D1, D2 are BAV99, 215, and the model of the transistor T1 is MMBT5551.
Assuming that the current through the first sampling resistor R4 is Iin, it can be seen from the above that the current through the second sampling resistor R11 is Iin, and thus the voltage Ui across the first sampling resistor R4 is represented by formula (1):
Ui=Iin×R1 （1）
the output voltage of the voltage type output circuit is shown in formula (2)
Uo=（R6/R5+1）×Ui=（R6/R5+1）×Iin×R1 （2）
Referring to fig. 1, resistors R1, R2, capacitors C1, C4 and an operational amplifier form a second order low pass active filter.
For a current-mode circuit, assuming that the emitter potential of the triode is Uy, the potentials of the inverting input terminal and the non-inverting input terminal of the operational amplifier can be found in formula (3)
Um=Up=R12/（R12+R13）×Uy （3）
The non-inverting input terminal of the operational amplifier N1B has a formula (4) as known from KCL law
（Ui-Um）/（R7//R9）=（Um-Uz）/R8 （4）
The voltage across resistor R14 can be found in equation (5)
U=Uy-Uz （5）
In this example, the resistances of the resistors R8, R9, R12, and R13 are all equal.
The current flowing through the resistor R14 can be found in equation (6)
Iout=Ui/R14 （6）
The magnitude of the current output by the current-mode circuit is proportional to the voltage across the sampling resistor R11.
Therefore, the analog quantity output circuit for the frequency converter can realize the output of 0-10V voltage analog quantity or 0-20mA current analog quantity at the same terminal, saves space, reduces cost, has high switching efficiency, is convenient and quick, and is safe to operate.
Claims (6)
1. The analog quantity output circuit comprises a voltage type analog quantity output circuit and a current type analog quantity output circuit, wherein the input ends of the voltage type analog quantity output circuit and the current type analog quantity output circuit are selectively connected to the same analog input signal Iin to be converted; the method is characterized in that: the voltage type analog quantity output circuit is composed of a first sampling circuit and a voltage amplifying circuit, the current type analog quantity output circuit is composed of a second sampling circuit and a current amplifying circuit, the first sampling circuit and the second sampling circuit are selectively connected to the same analog input signal Iin, the first sampling circuit and the second sampling circuit are used for converting a current source into a voltage source, the voltage amplifying circuit amplifies and outputs the voltage source, and the current amplifying circuit converts the voltage source into the current source for outputting; the output end of the voltage amplifying circuit is connected with the output end of the current amplifying circuit and is used for outputting a voltage type or current type output signal Uo.
2. The analog output circuit for a frequency converter according to claim 1, wherein: the first sampling circuit is composed of a first sampling resistor R4 (1) and a capacitor C3 connected in parallel with the first sampling resistor R4, the voltage amplifying circuit is composed of an operational amplifier N1A (2), a resistor R1, a resistor R2, a resistor R3, a resistor R5, a resistor R6, a capacitor C1, a capacitor C2 and a capacitor C4, two ends of the resistor R4 are respectively connected to an analog input signal Iin and a power ground GND, one end of the resistor R1 connected in series with the resistor R2 is connected to a non-grounding end of the resistor R4, the other end of the resistor R1 is connected to a non-inverting input end of the operational amplifier N1A, two ends of the capacitor C4 are respectively connected to the power ground GND and an inverting input end of the operational amplifier N1A; one end of the resistor R3 is connected to the output end of the operational amplifier N1A, and the other end of the resistor R3 is respectively connected to the inverting input end of the operational amplifier N1A and the junction of the resistor R1 and the resistor R2 through the resistor R6 and the capacitor C1; the junction of the resistor R3 and the resistor R6 forms a voltage type signal output end.
3. The analog output circuit for a frequency converter according to claim 2, wherein: the second sampling circuit is composed of a second sampling resistor R11 (3) and a capacitor C8 connected in parallel with the second sampling resistor R11, the current amplifying circuit is composed of an operational amplifier N1B (4), an NPN triode T1 (5), a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R12, a resistor R13 and a resistor R14, two ends of the resistor R11 are respectively connected to an analog input signal Iin and a power ground GND, two ends of the resistor R9 are respectively connected to a non-grounding end of the resistor R11 and a non-inverting input end of the operational amplifier N1B, the resistor R7 is connected in parallel with the resistor R9, the non-inverting input end of the operational amplifier N1B is connected with an inverting input end of the operational amplifier N1B through the resistor R8, the resistor R14 and the resistor R13 in sequence, and two ends of the resistor R12 are respectively connected with the power ground GND and the inverting input end of the operational amplifier N1B; the output end of the operational amplifier N1B is connected to the base electrode of the triode T1 through a resistor R10, the collector electrode of the triode T1 is connected to the positive electrode of the power supply, the emitter electrode of the triode T1 is connected to the joint of the resistor R13 and the resistor R14, and the joint of the resistor R14 and the resistor R8 forms a current type signal output end.
4. An analog output circuit for a frequency converter according to claim 3, wherein: the resistance values of the resistor R1, the resistor R2 and the resistor R6 are equal, and the resistance values of the resistor R8, the resistor R9, the resistor R12 and the resistor R13 are equal.
5. An analog output circuit for a frequency converter according to claim 3 or 4, wherein: the anti-reverse circuit comprises a series diode group D1 and a series diode group D2, wherein the series diode group D1 and the series diode group D2 are formed by two diodes which are sequentially connected in series, the voltage type signal output end of the voltage amplifying circuit is connected to the positive electrode of the series diode group D1, the negative electrode of the series diode group D1 is connected to the positive electrode of a power supply, the current type signal output end of the current amplifying circuit is connected to the middle wiring end of the series diode group D2, and the positive electrode of the series diode group D2 is connected to the ground of the power supply; the intermediate terminal of the series diode group D1 is connected to the negative pole of the series diode group D2 and forms the output of the voltage-type or current-type output signal Uo.
6. An analog output circuit for a frequency converter according to claim 3 or 4, wherein: the positive electrode and the negative electrode of the power supply of the operational amplifier N1A (2) are respectively connected to the power supply ground through a capacitor C5 and a capacitor C2, and the collector of the triode T1 (5) is connected to the power supply ground GND through a capacitor C7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320639726.4U CN219716005U (en) | 2023-03-28 | 2023-03-28 | Analog output circuit for frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320639726.4U CN219716005U (en) | 2023-03-28 | 2023-03-28 | Analog output circuit for frequency converter |
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| Publication Number | Publication Date |
|---|---|
| CN219716005U true CN219716005U (en) | 2023-09-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320639726.4U Active CN219716005U (en) | 2023-03-28 | 2023-03-28 | Analog output circuit for frequency converter |
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| Country | Link |
|---|---|
| CN (1) | CN219716005U (en) |
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- 2023-03-28 CN CN202320639726.4U patent/CN219716005U/en active Active
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