Motor three-phase terminal voltage isolation acquisition circuit and motor

Abstract

The utility model discloses a motor three-phase terminal voltage isolation acquisition circuit and a motor, the acquisition circuit comprises an isolation operation amplification circuit and a single-ended signal processing operation amplification circuit, the isolation operation amplification circuit is connected with the single-ended signal processing operation amplification circuit, the input end of the isolation operation amplification circuit is a terminal voltage, and the output end of the isolation operation amplification circuit is a single-ended signal processing operation amplification circuit. And the output end of the single-ended signal processing operational amplification circuit is a single-ended signal. On one hand, the complexity of the acquisition circuit is reduced, and on the other hand, processor resources are saved. The utility model further provides a motor which can be applied to aviation and spaceflight.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of motor control, and in particular to a motor three-phase terminal voltage isolation acquisition circuit and motor. BACKGROUND

[0002] Phase voltage refers to the voltage between a line conductor and a conductor connected to the neutral point of a system at a given point in a multiphase alternating current circuit, and is commonly three-phase voltage.

[0003] In the related art, one way of acquiring a phase voltage signal is to directly acquire the potential difference between an output phase and a neutral point. However, this way is not suitable for a motor without a neutral point. Therefore, for a motor without a neutral point, a neutral point needs to be simulated by a resistor, and the circuit is complex, so the reliability is reduced.

[0004] Another way is to directly acquire the potential difference between an output phase voltage and a bus potential. This way needs to consider isolation and high-low voltage processing, and the circuit is complex. In addition, the output acquisition signal of the traditional voltage acquisition circuit for the bus potential difference is generally a differential signal, and two signal lines occupy processor resources. CONTENT OF THE INVENTION

[0005] The application provides a motor three-phase terminal voltage isolation acquisition circuit and motor, so as to reduce the complexity of the circuit and reduce the occupation of processor resources.

[0006] The application adopts the following technical scheme:

[0007] In a first aspect, the application provides a motor three-phase terminal voltage isolation acquisition circuit, which comprises an isolation operational amplifier circuit and a single-ended signal processing operational amplifier circuit, the isolation operational amplifier circuit and the single-ended signal processing operational amplifier circuit, an input end of the isolation operational amplifier circuit is a terminal voltage, and an output end of the single-ended signal processing operational amplifier circuit is a single-ended signal.

[0008] In some embodiments, the terminal voltage comprises three-phase terminal voltage of a motor.

[0009] In some embodiments, the terminal voltage comprises an alternating current terminal circuit.

[0010] In some embodiments, the terminal voltage passes through a voltage dividing resistor and then enters the isolation operational amplifier circuit.

[0011] In some embodiments, the isolation operational amplifier circuit is used to process a voltage dividing signal of the terminal voltage and output a differential signal.

[0012] In some embodiments, the isolation operational amplifier circuit comprises a main chip of ACPL_C87B.

[0013] In some embodiments, the single-ended signal processing operational amplifier circuit comprises a subtractor circuit composed of operational amplifiers, which is used to convert the differential signal into a single-ended signal.

[0014] In some embodiments, the single-ended signal processing operational amplifier circuit comprises a subtractor circuit composed of LMV931Q1.

[0015] In some embodiments, a processor AD module is further included, which receives the output result of the single-ended signal processing operational amplifier circuit.

[0016] In the second aspect, the embodiments of the present application further provide an electric machine, wherein the acquisition circuit is used.

[0017] The above at least one technical scheme adopted by the embodiments of the present application can achieve the following beneficial effects: the circuit adopts an isolation operational amplifier circuit and a single-ended signal processing operational amplifier circuit, the isolation operational amplifier circuit and the single-ended signal processing operational amplifier circuit, the input end of the isolation operational amplifier circuit is a terminal voltage, the output end of the single-ended signal processing operational amplifier circuit is a single-ended signal, and the signal of the terminal voltage can be acquired and converted into a single-ended signal through the acquisition circuit, which not only reduces the resources of the processor but also reduces the circuit cost. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings, which are included to provide a further understanding of the present application, constitute a part of the present application, and the illustrative embodiments of the present application and their description serve to explain the present application, and do not constitute improper limitations on the present application. In the drawings:

[0019] Figure 1 FIG. 1 is a schematic diagram of an internal structure of a three-phase terminal voltage isolation acquisition circuit of an electric machine according to an embodiment of the present application;

[0020] Figure 2 FIG. 2 is a schematic diagram of an internal structure of a three-phase terminal voltage isolation acquisition circuit of an electric machine according to a preferred embodiment of the present application;

[0021] Figure 3 FIG. 3 is a schematic diagram of a circuit principle of a three-phase terminal voltage isolation acquisition circuit of an electric machine according to an embodiment of the present application; DETAILED DESCRIPTION

[0022] In order to make the purposes, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described below in connection with specific embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0023] The technical solutions provided by the embodiments of the present application will be described in detail below in connection with the drawings.

[0024] The embodiments of the present application provide a three-phase terminal voltage isolation acquisition circuit of a motor. Figure 1 As shown in the figure, the internal structure schematic diagram of the acquisition circuit in the embodiments of the present application is provided, the circuit comprises: an isolation operational amplifier circuit 110 and a single-ended signal processing operational amplifier circuit 120, the isolation operational amplifier circuit 110 and the single-ended signal processing operational amplifier circuit 120, the input end of the isolation operational amplifier circuit 110 is a terminal voltage, and the output end of the single-ended signal processing operational amplifier circuit 120 is a single-ended signal.

[0025] Please refer to Figure 1 , the isolation operational amplifier circuit 110 has an isolation operational amplifier function, can process the divided voltage signal of the terminal voltage, obtain a differential signal by processing, and output, and the reference is the bus ground. The single-ended signal processing operational amplifier circuit 120 has an isolation operational amplifier function, can output a differential signal with strong anti-interference ability, and the differential signal is converted into a single-ended signal by a subtracter circuit composed of an operational amplifier. For the acquisition circuit with complex circuit and isolation requirement in the related art, the acquisition circuit in the embodiments of the present application occupies reduced processor resources. The acquisition circuit can be used as a terminal voltage isolation acquisition single-ended output circuit, so as to reduce the complexity of the circuit, output a single-ended signal to save processor resources.

[0026] Further, the specific circuit structures in the isolation operational amplifier circuit 110 and the single-ended signal processing operational amplifier circuit 120 can adopt various ways, as long as the functions of isolation operational amplifier and single-ended signal processing operational amplifier can be realized, which are not specifically limited in the embodiments of the present application.

[0027] In an embodiment of the present application, the terminal voltage comprises three-phase terminal voltage of a motor.

[0028] Please refer to Figure 2 , for the three-phase terminal voltage of the motor, the acquisition circuit in the embodiments of the present application is used for isolation acquisition and output of a single-ended signal. The circuit structure is simple and does not occupy processor resources.

[0029] In an embodiment of the present application, the terminal voltage comprises an AC terminal circuit.

[0030] Please refer to Figure 2 , the terminal voltage mainly refers to the AC terminal voltage output by the AC terminal circuit. Generally, the AC terminal voltage needs to pass through a voltage dividing resistor before being squeezed into the operational amplifier circuit to prevent damage to the circuit caused by excessive current.

[0031] In an embodiment of the present application, a voltage dividing resistor is further included, and the terminal voltage passes through the voltage dividing resistor before entering the isolation operational amplifier circuit.

[0032] Please refer to Figure 2 , a voltage dividing resistor is also used, and the terminal voltage passes through the voltage dividing resistor before entering the isolation operational amplifier circuit. It can be understood that the voltage dividing resistor can adopt various circuit structures, which are not specifically limited in the embodiments of the present application, and preferably can be as shown in Figure 3 .

[0033] In an embodiment of the present application, the isolation operational amplifier circuit 110 is used to process the voltage dividing signal of the terminal voltage and output a differential signal.

[0034] Please refer to Figure 3 , the terminal voltage passes through a voltage dividing resistor into the isolation operational amplifier chip ACPL_C87B, and the isolation operational amplifier processes the voltage dividing signal of the terminal voltage, and the reference is the bus ground.

[0035] In an embodiment of the present application, the isolation operational amplifier circuit 110 comprises a main chip of ACPL_C87B.

[0036] Please refer to Figure 3 . It can be understood that ACPL_C87B is a precision optical isolation voltage sensor for voltage detection.

[0037] In an embodiment of the present application, the single-ended signal processing operational amplifier circuit 120 comprises a subtracter circuit composed of an operational amplifier, which is used to convert the differential signal into a single-ended signal.

[0038] Please refer to Figure 3 , the isolation operational amplifier circuit 110 outputs a differential signal with strong anti-interference ability, and the differential signal is converted into a single-ended signal by a subtracter circuit composed of an operational amplifier LMV931Q1, and finally output to the AD module of the processor.

[0039] In an embodiment of the present application, the single-ended signal processing operational amplifier circuit 120 comprises a subtracter circuit composed of LMV931Q1.

[0040] Please refer to Figure 3LMV931Q1 is a low voltage, low power operational amplifier, which can be used in the field of automobile, aviation, etc.

[0041] In an embodiment of the present application, a processor AD module is further included, which receives an output result of the single-ended signal processing operational amplifier circuit.

[0042] Please refer to Figure 2 The processor AD module is connected with the single-ended signal processing operational amplifier circuit, and the AD module is an analog-to-digital conversion module.

[0043] In an embodiment of the present application, an electric motor is further provided, which comprises a three-phase terminal voltage isolation acquisition circuit of the electric motor, and the acquisition circuit comprises an isolation operational amplifier circuit and a single-ended signal processing operational amplifier circuit.

[0044] In some embodiments, the terminal voltage comprises three-phase terminal voltage of the electric motor.

[0045] In some embodiments, the terminal voltage comprises an alternating current terminal circuit.

[0046] In some embodiments, a voltage dividing resistor is further included, and the terminal voltage passes through the voltage dividing resistor and then enters the isolation operational amplifier circuit.

[0047] In some embodiments, the isolation operational amplifier circuit is used to process a voltage dividing signal of the terminal voltage and output a differential signal.

[0048] In some embodiments, the isolation operational amplifier circuit comprises a main chip of ACPL_C87B.

[0049] In some embodiments, the single-ended signal processing operational amplifier circuit comprises a subtracter circuit composed of an operational amplifier, which is used to convert the differential signal into a single-ended signal.

[0050] In some embodiments, the single-ended signal processing operational amplifier circuit comprises a subtracter circuit composed of LMV931Q1.

[0051] In some embodiments, a processor AD module is further included, which receives an output result of the single-ended signal processing operational amplifier circuit.

[0052] The above merely provides an example of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application should be included in the scope of claims of the present application.

Claims

1. A motor three-phase terminal voltage isolation acquisition circuit, wherein, The circuit comprises an isolated operational amplifier circuit and a single-ended signal processing operational amplifier circuit, the isolated operational amplifier circuit and the single-ended signal processing operational amplifier circuit, an input end of the isolated operational amplifier circuit is an end voltage, and an output end of the single-ended signal processing operational amplifier circuit is a single-ended signal.

2. The circuit of claim 1, wherein, The end voltage comprises three-phase end voltages of a motor.

3. The circuit of claim 1, wherein, The end voltage comprises an alternating current end circuit.

4. The circuit of claim 1, wherein, The circuit further comprises a voltage dividing resistor, and the end voltage passes through the voltage dividing resistor and then enters the isolated operational amplifier circuit.

5. The circuit of claim 1, wherein, The isolated operational amplifier circuit is used for processing a voltage dividing signal of the end voltage and outputting a differential signal.

6. The circuit of claim 5, wherein, The isolated operational amplifier circuit comprises a main chip of an ACPL_C87B.

7. The circuit of claim 5, wherein, The single-ended signal processing operational amplifier circuit comprises a subtractor circuit composed of an operational amplifier, and is used for converting the differential signal into a single-ended signal.

8. The circuit of claim 7, wherein, The single-ended signal processing operational amplifier circuit comprises a subtractor circuit composed of an LMV931Q1.

9. The circuit of claim 1, wherein, The circuit further comprises a processor AD module, and the processor AD module receives an output result of the single-ended signal processing operational amplifier circuit.

10. An electric machine wherein, The acquisition circuit is adopted.

7. The acquisition circuit according to any one of claims 1 to 9.

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