CN117879611B - Three-phase differential sampling circuit, optimization method thereof and inverter - Google Patents
Three-phase differential sampling circuit, optimization method thereof and inverter Download PDFInfo
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Abstract
The application relates to a three-phase differential sampling circuit, an optimization method thereof and an inverter, wherein the circuit comprises three differential sampling sub-circuits and an adjusting circuit; the input end of the regulating circuit is connected with the neutral line, and the output end of the regulating circuit is connected with the second input end of each differential sampling sub-circuit; the first input end of each differential sampling sub-circuit is connected with a corresponding three-phase line respectively; and the differential sampling sub-circuit is used for generating a target voltage signal according to the first voltage signal input by the first input end and the second voltage signal input by the second input end. The application solves the problem that the circuit structure of the traditional differential sampling circuit is complex, so that the fault detection is difficult when the circuit breaks down, and is beneficial to the fault detection of the circuit.
Description
Technical Field
The application relates to the technical field of sampling circuits, in particular to a three-phase differential sampling circuit, an optimization method thereof and an inverter.
Background
A differential sampling circuit is an electronic circuit that amplifies and converts the difference between two input signals into a single output. The differential signal is typically represented as a potential difference between two input signals. The differential sampling circuit can reduce common mode noise, enhance the anti-interference capability of input signals, amplify tiny differential signals into enough voltage signals, and further improve the sensitivity and the precision of devices such as sensors.
For two input signals of a conventional differential sampling circuit, one input signal is generated according to a three-phase alternating-current voltage signal input by three phases, and the input signal is recorded as a first voltage signal. The other input signal is generated from the ac voltage signal and the regulating circuit and is denoted as a second voltage signal. The device parameters of the adjusting circuits for generating the second voltage signals are different for the first voltage signals with different phases, so that the circuit structure of the conventional differential sampling circuit is complex, and the fault detection is difficult when the circuit breaks down.
Aiming at the problems that the circuit structure of the traditional differential sampling circuit is complex and the fault detection is difficult when the circuit breaks down in the related technology, no effective solution is proposed at present.
Disclosure of Invention
In this embodiment, a three-phase differential sampling circuit, an optimization method thereof and an inverter are provided, so as to solve the problem that in the related art, the circuit structure of the traditional differential sampling circuit is complex, and thus the fault detection is difficult when the circuit breaks down.
In a first aspect, in this embodiment, there is provided a three-phase differential sampling circuit including three differential sampling sub-circuits and one adjusting circuit;
the input end of the regulating circuit is connected with the neutral line, and the output end of the regulating circuit is connected with the second input end of each differential sampling sub-circuit;
The first input end of each differential sampling sub-circuit is connected with a corresponding three-phase line respectively;
and the differential sampling sub-circuit is used for generating a target voltage signal according to the first voltage signal input by the first input end and the second voltage signal input by the second input end.
In some of these embodiments, the differential sampling sub-circuit includes a voltage feedback module and an adjustment circuit;
The input end of the voltage feedback module is respectively connected with the first input end and the negative voltage input end of the differential amplification module; the output end of the voltage feedback module is connected with the output end of the differential amplification module;
the forward voltage input end of the differential amplification module is connected with the output end of the regulating circuit.
In some of these embodiments, the voltage feedback module includes a first voltage control unit and a first filtering unit;
The input end of the first voltage control unit is respectively connected with the first input end, the input end of the first filtering unit and the negative voltage input end of the differential amplification module;
the output end of the first voltage control unit is respectively connected with the output end of the first filtering unit and the output end of the differential amplifying module.
In some of these embodiments, the first voltage control unit includes a first resistor; one end of the first resistor is respectively connected with the first input end, the input end of the first filtering unit and the negative voltage input end of the differential amplifying module; the other end of the first resistor is respectively connected with the output end of the first filtering unit and the output end of the differential amplifying module;
the first filtering unit comprises a first capacitor; one end of the first capacitor is connected with one end of the first resistor; the other end of the first capacitor is connected with the other end of the first resistor.
In some embodiments, the three differential sampling subcircuits further include a current limiting resistor R1, one end of the current limiting resistor being connected to the first input terminal; the other end of the current limiting resistor is respectively connected with the input end of the voltage feedback module and the negative voltage input end of the differential amplifying module.
In some of these embodiments, the conditioning circuit includes a second voltage control unit and a second filtering unit;
The input end of the second voltage control unit is respectively connected with the bias voltage signal input end and the input end of the second filtering unit; the output end of the second voltage control unit is connected with the output end of the second filtering unit.
In some of these embodiments, the second voltage control unit includes a second resistor and a third resistor;
One end of the second resistor is connected with a neutral line; the other end of the second resistor is respectively connected with one end of the third resistor, the output end of the second filtering unit and the second input end;
the other end of the third resistor is respectively connected with the bias voltage signal input end and the output end of the second filtering unit.
In some of these embodiments, the second filtering unit includes a second capacitor and a third capacitor;
One end of the second capacitor is connected with the other end of the second resistor respectively; the other end of the second capacitor is connected with the other end of the third resistor and one end of the third capacitor respectively;
the other end of the third capacitor is grounded.
In a second aspect, in this embodiment, there is provided a method for optimizing a differential sampling circuit, which is applicable to the three-phase differential sampling circuit of the first aspect, and includes:
transmitting the alternating voltage signal output by the three-phase line to a first input end of a corresponding differential sampling sub-circuit; generating a first voltage signal through a first input of the differential sampling sub-circuit;
generating, by the regulating circuit, a second voltage signal; transmitting a second voltage signal to a second input of each differential sampling sub-circuit, respectively;
and generating a target voltage signal according to the first voltage signal and the second voltage signal by the differential sampling sub-circuit.
In a third aspect, in this embodiment, there is provided an inverter including the three-phase differential sampling circuit as described in the first aspect.
Compared with the related art, the three-phase differential sampling circuit, the optimization method and the inverter thereof provided in the embodiment comprise three differential sampling sub-circuits and one regulating circuit; the input end of the regulating circuit is connected with the neutral line, and the output end of the regulating circuit is connected with the second input end of each differential sampling sub-circuit; the first input end of each differential sampling sub-circuit is connected with a corresponding three-phase line respectively; the differential sampling sub-circuit is used for generating a target voltage signal according to a first voltage signal input by the first input end and a second voltage signal input by the second input end, and solves the problem that the circuit structure of the traditional differential sampling circuit is complex, so that the fault detection is difficult when the circuit breaks down, and the fault detection of the circuit is facilitated.
The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below to provide a more thorough understanding of the other features, objects, and advantages of the application.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
Fig. 1 is a schematic structural diagram of a three-phase differential sampling circuit according to an embodiment;
FIG. 2 is a schematic diagram of a differential sampling sub-circuit according to an embodiment;
Fig. 3 is a schematic diagram of the structure of the differential sampling sub-circuit for phase a of the present embodiment;
fig. 4 is a schematic diagram of the structure of the differential sampling sub-circuit for the B phase of the present embodiment;
fig. 5 is a schematic diagram of the structure of the differential sampling sub-circuit for the C phase of the present embodiment;
Fig. 6 is a flowchart of an optimization method of the three-phase differential sampling circuit according to an embodiment.
In the figure: 10. a differential sampling sub-circuit; 20. an adjusting circuit; 30. a voltage feedback module; 40. and a differential amplification module.
Detailed Description
The present application will be described and illustrated with reference to the accompanying drawings and examples for a clearer understanding of the objects, technical solutions and advantages of the present application.
Unless defined otherwise, technical or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terms "a," "an," "the," "these" and similar terms in this application are not intended to be limiting in number, but may be singular or plural. The terms "comprising," "including," "having," and any variations thereof, as used herein, are intended to encompass non-exclusive inclusion; for example, a process, method, and system, article, or apparatus that comprises a list of steps or modules (units) is not limited to the list of steps or modules (units), but may include other steps or modules (units) not listed or inherent to such process, method, article, or apparatus. The terms "connected," "coupled," and the like in this disclosure are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The term "plurality" as used herein means two or more. "and/or" describes an association relationship of an association object, meaning that there may be three relationships, e.g., "a and/or B" may mean: a exists alone, A and B exist together, and B exists alone. Typically, the character "/" indicates that the associated object is an "or" relationship. The terms "first," "second," "third," and the like, as referred to in this disclosure, merely distinguish similar objects and do not represent a particular ordering for objects.
In the three-phase differential sampling circuit provided by the application, fig. 1 is a schematic structural diagram of the three-phase differential sampling circuit provided by an embodiment, as shown in fig. 1, in the embodiment, the three-phase differential sampling circuit includes three differential sampling sub-circuits 10 and an adjusting circuit 20;
an input end of the regulating circuit 20 is connected with a neutral line, and an output end of the regulating circuit 20 is connected with a second input end of each differential sampling sub-circuit 10;
The first input end of each differential sampling sub-circuit 10 is respectively connected with a corresponding three-phase line;
the differential sampling sub-circuit 10 is configured to generate a target voltage signal according to a first voltage signal input by a first input terminal and a second voltage signal input by a second input terminal.
Specifically, an ac voltage signal is transmitted on the neutral line, the ac voltage signal is transmitted to the input end of the adjusting circuit 20, the ac voltage signal is divided and filtered by the adjusting circuit 20 to obtain a second voltage signal, and the second voltage signal is transmitted from the output end of the adjusting circuit 20 to the second input end; the three phase lines output three ac voltage signals of different phases, each of which is connected to a first input of a corresponding differential sampling sub-circuit 10. According to the alternating voltage signal of each phase, a first voltage signal is obtained at a first input end; the first voltage signal corresponding to the first input terminal of each differential sampling sub-circuit 10 is different, and the second input terminal of each differential sampling sub-circuit 10 shares the same second voltage signal; and generating a target voltage signal according to the first voltage signal and the second voltage signal, wherein the target voltage signal is an alternating current voltage signal subjected to differential amplification.
Through the circuit structure, the second input end of each differential sampling sub-circuit 10 shares the same second voltage signal, so that the second voltage signal can be generated by only one regulating circuit 20, the circuit complexity of the differential sampling circuit is further simplified, the problem that the fault detection is difficult when the circuit breaks down due to the fact that the circuit structure of the traditional differential sampling circuit is complex in the prior art is solved, and the fault detection of the circuit is facilitated.
In some of these embodiments, the differential sampling subcircuit 10 includes a voltage feedback module 30 and a differential amplification module 40;
The input end of the voltage feedback module 30 is respectively connected with the first input end and the negative voltage input end of the differential amplification module 40; the output end of the voltage feedback module 30 is connected with the output end of the differential amplification module 40;
The positive voltage input of the differential amplification module 40 is connected to the output of the regulating circuit 20.
Specifically, fig. 2 is a schematic structural diagram of a three-phase differential sampling circuit according to an embodiment, and as shown in fig. 2, three differential sampling sub-circuits 10 in the differential sampling circuit each include a voltage feedback module 30 and a differential amplifying module 40; the input end of the voltage feedback module 30 is respectively connected with the first input end and the negative voltage input end of the differential amplification module 40; the output end of the voltage feedback module 30 is connected with the output end of the differential amplification module 40, and the voltage feedback module 30 is used for dividing and filtering the first voltage signal to generate a feedback voltage signal; the positive voltage input end of the differential amplifying module 40 is connected to the output end of the adjusting circuit, and is used for generating a differential amplifying signal according to the first voltage signal of the negative voltage input end and the second voltage signal of the positive voltage input end, and the differential amplifying signal is fed back and adjusted by the voltage feedback signal to obtain a target voltage signal, and it should be noted that, the specific device for implementing the differential amplifying function of the differential amplifying module 40 in this embodiment is a differential amplifier, and the differential amplifier is the most common one in the electronic circuit, and is favored by the characteristics of high precision, low noise, strong anti-interference and the like, and the characteristics of the differential amplifier are mainly expressed in the following aspects: the differential amplifier is an amplifier with high precision, can amplify tiny differential signals to a considerable level, and is beneficial to improving the precision and stability of a circuit; because the differential amplifier adopts a double-input single-output structure, after the input signals are mutually counteracted, the interference of noise is reduced, and the noise of the differential amplifier is very low; the differential amplifier adopts a differential input mode, so that noise and clutter caused by factors such as power supply interference can be counteracted, and the anti-interference capability of the differential amplifier is enhanced; the differential amplifier can also conveniently realize voltage-to-current conversion or current-to-voltage conversion, so that the flexibility and adaptability of the circuit are further improved. The feedback voltage signal generated by the voltage feedback module 30 is used for carrying out feedback adjustment on the differential amplification signal generated by the differential amplification module 40, so that the effectiveness and accuracy of the generated target voltage signal are ensured.
In some of these embodiments, the voltage feedback module includes a first voltage control unit and a first filtering unit;
The input end of the first voltage control unit is respectively connected with the first input end, the input end of the first filtering unit and the negative voltage input end of the differential amplification module;
the output end of the first voltage control unit is respectively connected with the output end of the first filtering unit and the output end of the differential amplifying module.
Specifically, the voltage feedback module in the differential sampling sub-circuit comprises a first voltage control unit and a first filtering unit; the input end of the first voltage control unit is respectively connected with the first input end, the input end of the first filtering unit and the negative voltage input end of the differential amplification module; the output end of the first voltage control unit is respectively connected with the output end of the first filtering unit and the output end of the differential amplifying module. The first voltage control unit is used for dividing the first voltage signal input to the voltage feedback module, so that the accuracy of the output feedback voltage signal is ensured; the first filtering unit is used for filtering the first voltage signal input to the voltage feedback module, so that the stability of the output feedback voltage signal is ensured.
In some of these embodiments, the first voltage control unit includes a first resistor; one end of the first resistor is respectively connected with the first input end, the input end of the first filtering unit and the negative voltage input end of the differential amplifying module; the other end of the first resistor is connected with the output end of the first filtering unit and the output end of the differential amplifying module respectively.
The first filtering unit comprises a first capacitor; one end of the first capacitor is connected with one end of the first resistor; the other end of the first capacitor is connected with the other end of the first resistor.
Specifically, in this embodiment, the voltage dividing function of the first voltage control unit is implemented by the first resistor, and in other embodiments, the voltage dividing function may also be implemented by other circuit elements having a voltage dividing function, such as elements of a diode; the filtering function of the first filtering unit in this embodiment is implemented by the first capacitor, and in other embodiments, the filtering function may also be implemented by other circuit elements or filtering circuits having filtering functions. Through the circuit structure, the stability of the feedback voltage signal is ensured.
In some embodiments, the three differential sampling subcircuits further include a current limiting resistor R1, one end of which is connected to the first input terminal; the other end of the current limiting resistor is respectively connected with the input end of the voltage feedback module and the negative voltage input end of the differential amplifying module.
Specifically, in this embodiment, the first input terminal is connected to one end of a current limiting resistor, and the input current is limited to mA level by the current limiting resistor R1, so as to protect the differential amplifying module.
In some of these embodiments, the conditioning circuit includes a second voltage control unit and a second filtering unit;
The input end of the second voltage control unit is respectively connected with the bias voltage signal input end and the input end of the second filtering unit; the output end of the second voltage control unit is connected with the output end of the second filtering unit.
Specifically, the bias voltage signal is divided by a second voltage control unit; and the bias voltage is filtered through the second filtering unit, so that the stability and the accuracy of the generated second voltage signal are ensured.
In some of these embodiments, the voltage signal generated at the bias voltage signal input is a dc voltage signal.
Specifically, the Bias voltage (Bias voltage) refers to a constant voltage provided in an electronic device or circuit in order to make it function normally. Bias voltages are typically used to operate electronic devices (e.g., transistors or differential amplifiers) in their proper operating regions to achieve the desired function. The bias voltage signal in the embodiment is a direct current voltage signal, and the voltage signal of the forward voltage input end is ensured to be a positive value through the bias voltage signal; and dividing and filtering the bias voltage signal through a resistor R2 and a resistor R4 in the regulating circuit to obtain a second voltage signal.
In some of these embodiments, the second voltage control unit includes a second resistor and a third resistor;
One end of the second resistor is connected with a neutral line; the other end of the second resistor is respectively connected with one end of the third resistor, the output end of the second filtering unit and the second input end;
the other end of the third resistor is respectively connected with the bias voltage signal input end and the output end of the second filtering unit.
Specifically, one end of the second resistor is connected with a neutral line; the other end of the second resistor is respectively connected with one end of the third resistor, the output end of the second filtering unit and the second input end; the other end of the third resistor is connected with the bias voltage signal input end and the output end of the second filtering unit respectively, in this embodiment, the voltage dividing function of the second voltage control unit is realized through the second resistor and the third resistor, in other embodiments, the voltage dividing function can also be realized through other circuit elements with voltage dividing function, such as diodes and other elements, and through the structure, the accuracy of the generated second voltage signal is ensured.
In some of these embodiments, the second filtering unit includes a second capacitor and a third capacitor;
One end of the second capacitor is connected with the other end of the second resistor respectively; the other end of the second capacitor is connected with the other end of the third resistor and one end of the third capacitor respectively;
the other end of the third capacitor is grounded.
Specifically, the filtering function of the second filtering unit in this embodiment is implemented by the second capacitor and the third capacitor, and in other embodiments may also be implemented by other circuit elements or filtering circuits having the filtering function. By the structure, the stability of the generated second voltage signal is ensured.
The present embodiment is described and illustrated below by way of preferred embodiments.
The three-phase differential sampling circuit of the preferred embodiment comprises three differential sampling sub-circuits and an adjusting circuit; the input end of the regulating circuit is connected with the neutral line, and the output end of the regulating circuit is connected with the second input end of each differential sampling sub-circuit; the first input end of each differential sampling sub-circuit is connected with a corresponding three-phase line respectively; and the differential sampling sub-circuit is used for generating a target voltage signal according to the first voltage signal input by the first input end and the second voltage signal input by the second input end.
Fig. 3 is a schematic diagram of the structure of the differential sampling sub-circuit for the a phase of the present embodiment. As shown in fig. 3, the current limiting resistor in the circuit is a resistor R1; the first resistor in the voltage feedback module 30 of the circuit is a resistor R3, and the first capacitor is a capacitor C1; the second resistor in the regulating circuit 20 of the circuit is a resistor R2, the third resistor is a resistor R4, the second capacitor is a capacitor C2, and the third capacitor is a capacitor C3; the specific implementation device of the differential amplifying module 40 in this circuit is a differential amplifier A0 (the power supply voltage Vcc of A0 is 12V).
Wherein the input voltage of the phase A line (phase A line is) The capacitor C1 is connected with the other end of the resistor R3 and the 1-pin output end (positive voltage input end) of the differential amplifier A0 respectively;
neutral line (input voltage of neutral line is ) One end of the resistor R2 is connected with one end of the resistor R2, one end of the capacitor C2 and the 3-pin input end (forward voltage input end) of the differential amplifier A0, and the other end of the capacitor C2 is connected with the other end of the resistor R4, one end of the capacitor C3 and the bias voltage signal (/ >)) The other end of the capacitor C3 is grounded.
When r1=r2, r3=r4, the target voltage a signalThe values of (2) are:
。
Fig. 4 is a schematic diagram of the structure of the differential sampling sub-circuit for the B phase of the present embodiment. As shown in fig. 4, the current limiting resistor in the circuit is a resistor R5; the first resistor in the voltage feedback module 30 of the circuit is a resistor R7, and the first capacitor is a capacitor C4; the specific implementation device of the differential amplification module 40 in this circuit is a differential amplifier A1 (the power supply voltage Vcc of A1 is 12V).
Wherein the B phase line of the three phase lines (the input voltage of the B phase line is) The capacitor C4 is connected with the other end of the resistor R7 and the 7-pin output end (positive voltage input end) of the differential amplifier A1 respectively;
the 5-pin input terminal (forward voltage input terminal) of the differential amplifier A1 of the circuit is connected with the 3-pin input terminal of the differential amplifier A0 of the phase difference sub-sampling sub-circuit, namely, the phase difference sub-sampling sub-circuit and the phase difference sub-sampling sub-circuit share one regulating circuit 20.
Similarly, when r5=r2, r7=r4, the B phase difference divides the target voltage signal of the sampling sub-circuitThe values of (2) are:
。
fig. 5 is a schematic diagram of the structure of the differential sampling sub-circuit for the C phase of the present embodiment. As shown in fig. 5, the current limiting resistor in the circuit is a resistor R9; the first resistor in the voltage feedback module 30 of the circuit is a resistor R10, and the first capacitor is a capacitor C7; the specific implementation device of the differential amplifying module 40 in the circuit is a differential amplifier A2 (the power supply voltage Vcc of A2 is 12V).
Wherein the C-phase line of the three phase lines (the input voltage of the C-phase line is) The capacitor C7 is connected with the other end of the resistor R10 and the 8-pin output end (positive voltage input end) of the differential amplifier A2 respectively; the 10 pin input end (forward voltage input end) of the differential amplifier A2 of the circuit is connected with the 3 pin input end of the differential amplifier A0 of the phase difference sub-sampling sub-circuit, namely the phase difference sub-sampling sub-circuit A, the phase difference sub-sampling sub-circuit B and the phase difference sub-sampling sub-circuit C share one regulating circuit 20.
Similarly, when r9=r2 and r10=r4, the C phase difference divides the target voltage signal of the sampling sub-circuitThe values of (2) are:
。
Through the three-phase differential sampling circuit of the preferred embodiment, the A-phase differential sampling sub-circuit, the B-phase differential sampling sub-circuit and the C-phase differential sampling sub-circuit share one adjusting circuit, compared with the traditional three-phase differential sampling circuit, the three-phase differential sampling circuit reduces the use of resistance and capacitance devices, solves the problem that the circuit structure of the traditional differential sampling circuit is complex, so that the fault detection is difficult when the circuit breaks down, and is beneficial to the fault detection of the circuit.
In this embodiment, an optimization method of a three-phase differential sampling circuit is provided, and fig. 6 is a flowchart of the optimization method of the three-phase differential sampling circuit provided in an embodiment, as shown in fig. 6, where the flowchart includes the following steps:
Step S201, transmitting an alternating voltage signal output by a three-phase line to a first input end of a corresponding differential sampling sub-circuit; a first voltage signal is generated by a first input of the differential sampling sub-circuit.
Step S202, generating a second voltage signal through an adjusting circuit; the second voltage signal is transmitted to the second input terminal of each differential sampling sub-circuit.
In step S203, a target voltage signal is generated by the differential sampling sub-circuit according to the first voltage signal and the second voltage signal.
Specifically, transmitting an alternating voltage signal output by a three-phase line to a first input end of a corresponding differential sampling sub-circuit; generating a first voltage signal through a first input of the differential sampling sub-circuit; the bias voltage signal is converted into a second voltage signal through the regulating circuit; transmitting a second voltage signal to a second input of each differential sampling sub-circuit, respectively; and the differential sampling sub-circuit is used for generating a target voltage signal according to the first voltage signal and the second voltage signal. Through the steps, the problem that the circuit structure of the traditional differential sampling circuit is complex, so that the fault detection is difficult when the circuit breaks down is solved, and the fault detection of the circuit is facilitated.
By the optimization method of the three-phase differential sampling circuit, 3 differential sampling sub-circuits share one adjusting circuit, compared with the traditional three-phase differential sampling circuit, the use of resistance and capacitance devices is reduced, the problem that the circuit structure of the traditional differential sampling circuit is complex, so that fault detection is difficult when the circuit breaks down is solved, and fault detection of the circuit is facilitated.
In addition, in combination with the three-phase differential sampling circuit in the above embodiment, the embodiment of the present application may be implemented by providing an inverter including any one of the three-phase differential sampling circuits in the above embodiment.
It should be noted that, specific examples in this embodiment may refer to examples described in the foregoing embodiments and alternative implementations, and are not described in detail in this embodiment.
It should be understood that the specific embodiments described herein are merely illustrative of this circuit configuration and are not intended to be limiting. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure in accordance with the embodiments provided herein.
It is to be understood that the drawings are merely illustrative of some embodiments of the present application and that it is possible for those skilled in the art to adapt the present application to other similar situations without the need for inventive work. In addition, it should be appreciated that while the development effort might be complex and lengthy, it would nevertheless be a routine undertaking of design, fabrication, or manufacture for those of ordinary skill having the benefit of this disclosure, and thus should not be construed as a departure from the disclosure.
The term "embodiment" in this disclosure means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive. It will be clear or implicitly understood by those of ordinary skill in the art that the embodiments described in the present application can be combined with other embodiments without conflict.
The above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the patent claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of the application should be assessed as that of the appended claims.
Claims (7)
1. A three-phase differential sampling circuit, characterized by comprising three differential sampling sub-circuits (10) and a regulating circuit (20);
The input end of the regulating circuit (20) is connected with a neutral line, and the output end of the regulating circuit (20) is connected with the second input end of each differential sampling sub-circuit (10);
the regulating circuit (20) comprises a second voltage control unit and a second filtering unit;
The input end of the second voltage control unit is respectively connected with the bias voltage signal input end and the input end of the second filtering unit; the output end of the second voltage control unit is connected with the output end of the second filtering unit;
The second voltage control unit comprises a second resistor and a third resistor;
One end of the second resistor is connected with a neutral line; the other end of the second resistor is respectively connected with one end of the third resistor, the output end of the second filtering unit and the second input end;
The other end of the third resistor is connected with the bias voltage signal input end and the output end of the second filtering unit respectively;
the second filtering unit comprises a second capacitor and a third capacitor;
one end of the second capacitor is connected with the other end of the second resistor respectively; the other end of the second capacitor is connected with the other end of the third resistor and one end of the third capacitor respectively;
The other end of the third capacitor is grounded;
The first input end of each differential sampling sub-circuit (10) is respectively connected with a corresponding three-phase line;
the differential sampling sub-circuit (10) is used for generating a target voltage signal according to a first voltage signal input by the first input end and a second voltage signal input by the second input end.
2. The three-phase differential sampling circuit according to claim 1, characterized in that the differential sampling sub-circuit (10) comprises a voltage feedback module (30) and a differential amplification module (40);
The input end of the voltage feedback module (30) is respectively connected with the first input end and the negative voltage input end of the differential amplification module (40); the output end of the voltage feedback module (30) is connected with the output end of the differential amplification module (40);
the forward voltage input end of the differential amplification module (40) is connected with the output end of the regulating circuit (20).
3. The three-phase differential sampling circuit according to claim 2, characterized in that the voltage feedback module (30) comprises a first voltage control unit and a first filtering unit;
The input end of the first voltage control unit is respectively connected with the first input end, the input end of the first filtering unit and the negative voltage input end of the differential amplifying module (40);
The output end of the first voltage control unit is respectively connected with the output end of the first filtering unit and the output end of the differential amplifying module (40).
4. The three-phase differential sampling circuit of claim 3, wherein the first voltage control unit comprises a first resistor; one end of the first resistor is respectively connected with the first input end, the input end of the first filtering unit and the negative voltage input end of the differential amplifying module (40); the other end of the first resistor is respectively connected with the output end of the first filtering unit and the output end of the differential amplifying module (40);
The first filtering unit comprises a first capacitor; one end of the first capacitor is connected with one end of the first resistor; the other end of the first capacitor is connected with the other end of the first resistor.
5. The three-phase differential sampling circuit according to claim 2, characterized in that the three differential sampling sub-circuits (10) further comprise a current limiting resistor, one end of which is connected to the first input terminal; the other end of the current limiting resistor is respectively connected with the input end of the voltage feedback module (30) and the negative voltage input end of the regulating circuit (20).
6. A method for optimizing a three-phase differential sampling circuit, which is applied to the three-phase differential sampling circuit according to any one of claims 1 to 5, comprising:
transmitting the alternating voltage signal output by the three-phase line to a first input end of a corresponding differential sampling sub-circuit (10); generating a first voltage signal through a first input of the differential sampling sub-circuit (10);
Generating, by the regulating circuit (20), a second voltage signal; -transmitting said second voltage signal to a second input of each of said differential sampling sub-circuits (10), respectively;
a target voltage signal is generated from the first voltage signal and the second voltage signal by the differential sampling sub-circuit (10).
7. An inverter comprising the three-phase differential sampling circuit according to any one of claims 1 to 5.
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