CN216926905U - High-precision alternating voltage sampling circuit of inverter - Google Patents
High-precision alternating voltage sampling circuit of inverter Download PDFInfo
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- CN216926905U CN216926905U CN202123361408.6U CN202123361408U CN216926905U CN 216926905 U CN216926905 U CN 216926905U CN 202123361408 U CN202123361408 U CN 202123361408U CN 216926905 U CN216926905 U CN 216926905U
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Abstract
The utility model discloses a high-precision alternating voltage sampling circuit of an inverter, which comprises a first voltage reduction resistor R1, a second voltage reduction resistor R2 and an integrated amplifier U1B, wherein two input ends of the integrated amplifier U1B are respectively connected with the other ends of the first voltage reduction resistor R1 and the second voltage reduction resistor R2, the output end of the integrated amplifier U1B is connected with a voltage detection end of a controller, and the output end of the integrated amplifier U1B is also connected with a negative input end of the integrated amplifier U1B through a first resistor R11; a reference voltage circuit is connected to the positive input of the integrated amplifier U1B to provide a reference voltage for the integrated amplifier U1B. The AC output of the inverter is reduced by 100 times of alternating current signals through the first voltage reduction resistor R1 and the second voltage reduction resistor R2, and fluctuates up and down within the range of 2 times of the amplitude of the reference voltage V _ sta, so that the application of the single-voltage power supply operational amplifier circuit for detecting the AC voltage of the inverter is realized, the method is simple and reliable, the precision is high, and the voltage feedback value is not obtained by adopting a sensor mode, so that the cost is reduced.
Description
Technical Field
The utility model relates to the technical field of inverters, in particular to a high-precision alternating voltage sampling circuit of an inverter.
Background
In the prior art, a sine wave inverter output voltage detection main body detects and detects through a special voltage transformer, and the special transformer induces in an electromagnetic induction mode to obtain a small-signal alternating-current signal. And then the voltage is output to the controller for voltage sampling after filtering processing, and a voltage sampling value is obtained. The circuit scheme is complex, the cost is high, and the circuit volume is relatively large; the detection of the output voltage of the inverter is also realized by using a hall inductive sensor, and the disadvantage is that the output voltage is generally very small, and the output voltage is in the uV level. The small voltage is easily disturbed and the subsequent signal processing becomes complicated.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to solving, at least in part, one of the technical problems in the related art. Therefore, an object of the present invention is to provide a high-precision ac voltage sampling circuit for an inverter.
To achieve the above object, an inverter high-precision ac voltage sampling circuit according to an embodiment of the present invention includes:
one end of the first voltage-reducing resistor R1 is connected with a first inversion output end of the inverter;
one end of the second voltage-reducing resistor R2 is connected with a second inversion output end of the inverter;
the integrated amplifier U1B, two input ends of the integrated amplifier U1B are respectively connected with the other ends of the first voltage-reducing resistor R1 and the second voltage-reducing resistor R2, an output end of the integrated amplifier U1B is connected with a voltage detection end of a controller, and an output end of the integrated amplifier U1B is further connected with a negative input end of the integrated amplifier U1B through the first resistor R11;
a reference voltage circuit connected to the positive input of the integrated amplifier U1B to provide a reference voltage for the integrated amplifier U1B.
Further, according to an embodiment of the present invention, the reference voltage circuit includes:
a second resistor R5, one end of the second resistor R5 is connected with a power supply, and the other end of the second resistor R5 is connected with the positive input end of the integrated amplifier U1B;
and one end of the third resistor R9 is connected with the other end of the second resistor R5, and the other end of the third resistor R9 is connected with the reference ground.
Further, according to an embodiment of the present invention, the reference voltage circuit further includes:
a first capacitor C3, one end of the first capacitor C3 is connected with the one end of the third resistor R9, and the other end of the first capacitor C3 is connected with a reference ground.
Further, according to an embodiment of the present invention, the inverter high-precision ac voltage sampling circuit further includes:
the voltage dividing resistor R10 is connected with the positive input end of the integrated amplifier U1B through the voltage dividing resistor R10; one end of the voltage-dividing resistor R10 is connected to the one end of the third resistor R9, and the other end of the voltage-dividing resistor R10 is connected to the positive input of the integrated amplifier U1B.
Further, according to an embodiment of the present invention, the inverter high-precision ac voltage sampling circuit further includes:
one end of the second capacitor C1 is connected to the positive input end of the integrated amplifier U1B, and the other end of the second capacitor C1 is connected to the one end of the voltage dividing resistor R10.
Further, according to an embodiment of the present invention, the inverter high-precision ac voltage sampling circuit further includes a voltage clamp circuit connected to the output terminal of the integrated amplifier U1B to limit the output voltage of the integrated amplifier U1B within a set voltage range.
Further, according to an embodiment of the present invention, the clamp circuit includes:
a first diode D1, a cathode of the first diode D1 being connected to the power supply, an anode of the first diode D1 being connected to an output of the integrated amplifier U1B;
a second diode D2, the cathode of the second diode D2 being connected to the anode of the first diode D1, the anode of the second diode D2 being connected to ground.
Further, according to an embodiment of the present invention, the inverter high-precision ac voltage sampling circuit further includes:
the output end of the integrated amplifier U1B is connected with the voltage clamping circuit through the fourth resistor R7; one end of the fourth resistor R7 is connected with the output end of the integrated amplifier U1B, and the other end of the fourth resistor R7 is connected with the voltage clamping circuit;
further, according to an embodiment of the present invention, the inverter high-precision ac voltage sampling circuit further includes:
a third capacitor C4, one terminal of the third capacitor C4 is connected to the one terminal of the fourth resistor R7, and the other terminal of the third capacitor C4 is connected to a ground reference.
The inverter high-precision alternating voltage sampling circuit provided by the embodiment of the utility model is connected with a first inversion output end of the inverter through one end of a first voltage reduction resistor R1; one end of the second voltage reduction resistor R2 is connected with the second inversion output end of the inverter; two input ends of an integrated amplifier U1B are respectively connected with the other ends of the first voltage-reducing resistor R1 and the second voltage-reducing resistor R2, an output end of the integrated amplifier U1B is connected with a voltage detection end of a controller, and an output end of the integrated amplifier U1B is also connected with a negative input end of the integrated amplifier U1B through a first resistor R11; a reference voltage circuit is connected to the positive input of the integrated amplifier U1B to provide a reference voltage for the integrated amplifier U1B. The AC output of the inverter is reduced by 100 times of alternating current signals through the first voltage reduction resistor R1 and the second voltage reduction resistor R2, the alternating current signals fluctuate up and down within the range of 2 times of the amplitude of the reference voltage V _ sta, the application of detecting the AC alternating current voltage of the inverter by the single-voltage power supply operational amplifier circuit is realized, the output voltage is obtained by detecting the waveform signals through the controller through conversion, the voltages of the positive half shaft and the negative half shaft of the output alternating current can be detected, the mode of directly detecting the output voltage is simple and reliable, the precision is high, and the voltage feedback value is obtained without adopting a sensor mode, so the cost is reduced.
Drawings
FIG. 1 is a block diagram of a high-precision AC voltage sampling circuit for an inverter according to an embodiment of the present invention;
fig. 2 is a circuit diagram of another inverter high-precision ac voltage sampling circuit provided in the implementation of the present invention.
Reference numerals:
the objects, features and advantages of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the utility model. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Referring to fig. 1 and 2, an embodiment of the present invention provides an inverter high-precision ac voltage sampling circuit, including: the integrated voltage-reducing circuit comprises a first voltage-reducing resistor R1, a second voltage-reducing resistor R2, an integrated amplifier U1B and a reference voltage circuit, wherein one end of the first voltage-reducing resistor R1 is connected with a first inversion output end of the inverter; one end of the second voltage reduction resistor R2 is connected with a second inversion output end of the inverter; since the voltage of the inverted output alternating current of the inverter is high, the effective voltage value is usually about 220V or 110V, and the voltage of the inverter is reduced by the first voltage reduction resistor R1 and the second voltage reduction resistor R2 and then output to the integrated amplifier U1B. As shown in fig. 2, the first dropping resistor may be provided in plurality, such as R1, R3, and R4 in fig. 2. After being connected in series, the alternating current high voltage is converted into low voltage output. Similarly, the second step-down resistor may be provided in plurality, such as R2, R6, and R8 in fig. 2.
Two input ends of the integrated amplifier U1B are respectively connected with the other ends of the first voltage-reducing resistor R1 and the second voltage-reducing resistor R2, an output end of the integrated amplifier U1B is connected with a voltage detection end of the controller, and an output end of the integrated amplifier U1B is further connected with a negative input end of the integrated amplifier U1B through a first resistor R11; the integrated amplifier U1B forms a proportional amplifying circuit, and outputs the voltage value of the step-down output to the controller of the inverter after the proportional amplifying circuit is performed, so that the controller can obtain the output voltage value of the inverter.
The reference voltage circuit is connected to the positive input of the integrated amplifier U1B to provide a reference voltage for the integrated amplifier U1B. Because the output voltage of the inverter is AC alternating current, the voltage amplitude is positive and negative voltage values, and the integrated amplifier U1B is supplied by single voltage, the negative voltage value of the output voltage of the inverter cannot be directly subjected to voltage sampling. The voltage at the positive input of the integrated amplifier U1B is raised to a set voltage value V _ sta by the reference voltage circuit. Therefore, the application of the single-voltage-supply operational amplifier circuit for detecting the AC voltage of the inverter is realized, the AC output of the inverter is fed back to two input ends of the integrated amplifier U1B through the first voltage-reducing resistor R1 and the second voltage-reducing resistor R2, the output of the integrated amplifier U1B is reduced by more than 100 times, the AC signal fluctuates up and down within the range of 2 times of the amplitude of the reference voltage V _ sta, the waveform signal is detected by the controller and converted to obtain the output voltage, and the voltages of the positive half shaft and the negative half shaft of the output AC can be detected.
Referring to fig. 2, the reference voltage circuit includes: a second resistor R5 and a third resistor R9, wherein one end of the second resistor R5 is connected with a power supply, and the other end of the second resistor R5 is connected with the positive input end of the integrated amplifier U1B; one end of the third resistor R9 is connected with the other end of the second resistor R5, and the other end of the third resistor R9 is connected with the reference ground. A voltage division circuit is formed between the second resistor R5 and the third resistor R9, and after the voltage division circuit divides the +3.3V voltage of the power supply, the power supply is output to the positive input end of the integrated amplifier U1B of the reference signal V _ sta.
The reference voltage circuit further includes: a first capacitor C3, one end of the first capacitor C3 is connected with the one end of the third resistor R9, and the other end of the first capacitor C3 is connected with a reference ground. The first capacitor C3 can filter out interference signals, ensure the stability of the reference signal V _ sta and reduce detection errors caused by interference.
The inverter high-precision alternating voltage sampling circuit further comprises: the voltage dividing resistor R10 is connected with the positive input end of the integrated amplifier U1B through the voltage dividing resistor R10; one end of the voltage-dividing resistor R10 is connected to the one end of the third resistor R9, and the other end of the voltage-dividing resistor R10 is connected to the positive input of the integrated amplifier U1B. The alternating current output by the inverter can be divided by the voltage dividing resistor R10 through R2, R6, R8 and R10, and then reduced to a smaller voltage value, and output to the positive input end of the integrated amplifier U1B. The voltage value of V _ sta is then raised by the reference voltage. So that the output voltage fluctuates up and down within the range of 2 times the amplitude of the reference voltage V _ sta. The single voltage is used for power supply, and voltage complete signal output of the positive half shaft and the negative half shaft of the output alternating current is realized.
The inverter high-precision alternating voltage sampling circuit further comprises: one end of the second capacitor C1 is connected to the positive input end of the integrated amplifier U1B, and the other end of the second capacitor C1 is connected to the one end of the voltage dividing resistor R10. The second capacitor C1 can filter the interference pulse voltage input to the positive input end of the integrated amplifier U1B, ensure the integrity of the output signal of the integrated amplifier U1B, and improve the accuracy of voltage sampling.
The inverter high-precision alternating voltage sampling circuit further comprises a voltage clamping circuit, and the voltage clamping circuit is connected with the output end of the integrated amplifier U1B so as to limit the output voltage of the integrated amplifier U1B within a set voltage range. As shown in fig. 2, the clamp circuit includes: a first diode D1 and a second diode D2, the cathode of the first diode D1 is connected with the power supply, and the anode of the first diode D1 is connected with the output end of the integrated amplifier U1B; the cathode of the second diode D2 is connected to the anode of the first diode D1, and the anode of the second diode D2 is connected to ground. The output voltage value can be limited to the voltage range of 0-3.3V by the first diode D1 and the second diode D2. To meet the voltage sampling range of the controller.
The inverter high-precision alternating voltage sampling circuit further comprises: the output end of the integrated amplifier U1B is connected with the voltage clamping circuit through the fourth resistor R7; one end of the fourth resistor R7 is connected with the output end of the integrated amplifier U1B, and the other end of the fourth resistor R7 is connected with the voltage clamping circuit; the fourth resistor R7 is connected in series with the output end of the integrated amplifier U1B, so that the output current can be limited and output.
The inverter high-precision alternating voltage sampling circuit further comprises: a third capacitor C4, one terminal of the third capacitor C4 is connected to the one terminal of the fourth resistor R7, and the other terminal of the third capacitor C4 is connected to a ground reference. Through the third capacitor C4, interference pulse voltage output by the integrated amplifier U1B to the controller can be filtered, interference signals are prevented from being transmitted to the controller, and the precision of voltage sampling is improved.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing detailed description, or equivalent changes may be made in some of the features of the embodiments. All equivalent structures made by using the contents of the specification and the attached drawings of the utility model can be directly or indirectly applied to other related technical fields, and are also within the protection scope of the patent of the utility model.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (9)
1. An inverter high accuracy alternating voltage sampling circuit, characterized by includes:
the first voltage reduction resistor (R1), one end of the first voltage reduction resistor (R1) is connected with the first inversion output end of the inverter;
a second step-down resistor (R2), one end of the second step-down resistor (R2) is connected with a second inversion output end of the inverter;
the integrated amplifier (U1B), two input ends of the integrated amplifier (U1B) are respectively connected with the other ends of the first voltage-reducing resistor (R1) and the second voltage-reducing resistor (R2), the output end of the integrated amplifier (U1B) is connected with a voltage detection end of a controller, and the output end of the integrated amplifier (U1B) is further connected with the negative input end of the integrated amplifier (U1B) through the first resistor (R11);
a reference voltage circuit connected to the positive input of the integrated amplifier (U1B) to provide a reference voltage for the integrated amplifier (U1B).
2. The inverter high accuracy ac voltage sampling circuit of claim 1, wherein the reference voltage circuit comprises:
a second resistor (R5), one end of the second resistor (R5) is connected with a power supply, and the other end of the second resistor (R5) is connected with the positive input end of the integrated amplifier (U1B);
a third resistor (R9), one end of the third resistor (R9) being connected to the other end of the second resistor (R5), the other end of the third resistor (R9) being connected to ground.
3. The inverter high accuracy ac voltage sampling circuit of claim 2, wherein the reference voltage circuit further comprises:
a first capacitor (C3), one end of the first capacitor (C3) being connected to the one end of the third resistor (R9), the other end of the first capacitor (C3) being connected to a reference ground.
4. The inverter high-precision alternating voltage sampling circuit according to claim 2, further comprising:
a voltage dividing resistor (R10), the reference voltage circuit being connected to the positive input of the integrated amplifier (U1B) through the voltage dividing resistor (R10); wherein one end of the voltage dividing resistor (R10) is connected with the one end of the third resistor (R9), and the other end of the voltage dividing resistor (R10) is connected with the positive input end of the integrated amplifier (U1B).
5. The inverter high-precision alternating voltage sampling circuit according to claim 4, further comprising:
a second capacitor (C1), one end of the second capacitor (C1) is connected with the positive input end of the integrated amplifier (U1B), and the other end of the second capacitor (C1) is connected with the one end of the voltage dividing resistor (R10).
6. The inverter high accuracy ac voltage sampling circuit of claim 2, further comprising a voltage clamp circuit connected to the output of the integrated amplifier (U1B) to limit the output voltage of the integrated amplifier (U1B) to a set voltage range.
7. The inverter high accuracy ac voltage sampling circuit of claim 6, wherein the clamping circuit comprises:
a first diode (D1), a cathode of the first diode (D1) being connected to the power supply, an anode of the first diode (D1) being connected to an output of the integrated amplifier (U1B);
a second diode (D2), a cathode of the second diode (D2) being connected to an anode of the first diode (D1), an anode of the second diode (D2) being connected to a reference ground.
8. The inverter high accuracy ac voltage sampling circuit of claim 7, further comprising:
a fourth resistor (R7), the output terminal of the integrated amplifier (U1B) is connected with the voltage clamping circuit through the fourth resistor (R7); one end of the fourth resistor (R7) is connected with the output end of the integrated amplifier (U1B), and the other end of the fourth resistor (R7) is connected with the voltage clamping circuit.
9. The inverter high-precision alternating voltage sampling circuit according to claim 8, further comprising:
a third capacitor (C4), one end of the third capacitor (C4) being connected to the one end of the fourth resistor (R7), the other end of the third capacitor (C4) being connected to a reference ground.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202123361408.6U CN216926905U (en) | 2021-12-28 | 2021-12-28 | High-precision alternating voltage sampling circuit of inverter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202123361408.6U CN216926905U (en) | 2021-12-28 | 2021-12-28 | High-precision alternating voltage sampling circuit of inverter |
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| CN216926905U true CN216926905U (en) | 2022-07-08 |
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- 2021-12-28 CN CN202123361408.6U patent/CN216926905U/en active Active
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