A multiplexing switching device for inductive position sensor chips

Abstract

This disclosure provides a multiplexing switching device for an inductive position sensor chip. The device includes: first, second, and third analog front-ends; first, second, third, and fourth common terminals; and first, second, third, fourth, and fifth switches. The first common terminal is connected to a first terminal of the first analog front-end, a first terminal of the first switch, and a first terminal of the third switch. The second common terminal is connected to a second terminal of the first analog front-end and a first terminal of the fourth switch. The third common terminal is connected to a first terminal of the second analog front-end and a first terminal of the fifth switch. The fourth common terminal is connected to a second terminal of the third analog front-end, a first terminal of the second switch, and a second terminal of the fifth switch. The second terminals of the first and second switches are connected to a second terminal of the second analog front-end. The multiplexing switching device provided by this disclosure can greatly improve the flexibility of circuit design, avoid redesigning the circuit due to changes in coil connection methods, and further save time and economic costs.

Description

Technical Field

[0001] This disclosure relates to the field of sensor technology, and more specifically to a multiplexing switching device for an inductive position sensor chip. Background Technology

[0002] Inductive position sensors are widely used in industrial automation, robot joints, and precision machine tools due to their advantages such as non-contact operation, high precision, and resistance to dirt. Generally, an inductor coil is connected to the signal input terminal of the position sensor, and the acquired voltage signal is read through an analog front end (AFE). The required position or angle information is then calculated. Different inductor coil connection methods correspond to different coil voltage measurement modes.

[0003] Generally, there are three connection methods for inductor coils in inductive position sensor applications: IQ two-phase coil voltage measurement mode, three-phase coil line voltage measurement mode, and three-phase coil phase voltage measurement mode. For traditional inductive position sensors, only one coil voltage measurement mode can be selected. Once the coil connection method and corresponding voltage measurement mode are determined, any modification to the coil connection method requires a complete circuit redesign. However, the coil connection method and voltage measurement mode are strongly tied, lacking flexibility. Switching between measurement modes requires hardware replacement, and redesigning the circuit incurs additional time costs. If both two-phase and three-phase coil measurements are required simultaneously, traditional solutions require at least six signal input terminals. An increase in signal input terminals means a larger chip package is needed, leading to higher economic costs. In particular, especially in the three-phase coil line voltage measurement mode, the connection between the coil and the sensor chip inevitably uses through-hole jumpers on the printed circuit board, and the presence of these through-holes also causes signal transmission loss.

[0004] Therefore, existing technologies still need to be improved and enhanced.

[0005] It should be noted that the above introduction to the technical background is only for the purpose of providing a clear and complete explanation of the technical solutions of this application and facilitating understanding by those skilled in the art. It should not be assumed that these technical solutions are known to those skilled in the art simply because they have been described in the background section of this application. Utility Model Content

[0006] To address at least one of the aforementioned problems, as well as one or more other potential problems, this disclosure proposes a multiplexing switching device for inductive position sensor chips, enabling the sensor chip equipped with the device to simultaneously meet the inductor coil connection methods of three measurement modes; greatly improving circuit design flexibility, avoiding circuit redesign due to changes in coil connection methods, and further saving time and economic costs.

[0007] In a first aspect of this disclosure, a multiplexing switching device for an inductive position sensor chip is provided. The multiplexing switching device includes: a first, second, and third analog front-end; the multiplexing switching device is further provided with a first, second, third, and fourth common terminal; and a first, second, third, fourth, and fifth switch. The first common terminal is configured to be connected to a first terminal of the first analog front-end, a first terminal of the first switch, and a first terminal of the third switch. The second common terminal is configured to be connected to a second terminal of the first analog front-end and a first terminal of the fourth switch. The third common terminal is configured to be connected to a first terminal of the second analog front-end and a first terminal of the fifth switch. The fourth common terminal is configured to be connected to a second terminal of the third analog front-end, a first terminal of the second switch, and a second terminal of the fifth switch. The second terminals of the first and second switches are configured to be connected to the second terminal of the second analog front-end. The second terminals of the third and fourth switches are configured to be connected to the first terminal of the third analog front-end.

[0008] Furthermore, in some embodiments, the aforementioned multiplexing switching device is configured to include: a two-phase coil voltage measurement mode, a three-phase coil voltage first measurement mode, and a three-phase coil voltage second measurement mode.

[0009] Furthermore, in some embodiments, when the multiplexing switching device is configured in a two-phase coil voltage measurement mode, the multiplexing switching device is configured such that: the first common terminal is connected to the first end of the first inductor winding of the two-phase coil; the second common terminal is connected to the second end of the first inductor winding of the two-phase coil; the third common terminal is connected to the first end of the second inductor winding of the two-phase coil; the fourth common terminal is connected to the second end of the second inductor winding of the two-phase coil; and the fourth common terminal is also connected to the second end of the second analog front end via the closed second switch; the first, third, fourth, and fifth switches are configured to be open circuits.

[0010] Furthermore, in some embodiments, when the multiplexing switching device is configured in the first measurement mode of the three-phase coil voltage, the multiplexing switching device is configured such that: the first common terminal is connected to the second end of the first inductor winding of the first three-phase coil; the second common terminal is connected to the second end of the second inductor winding of the first three-phase coil; the fourth common terminal is connected to the second end of the third inductor winding of the first three-phase coil; the first end of the first inductor winding of the first three-phase coil is connected to the first end of the second inductor winding and the first end of the third inductor winding of the first three-phase coil, respectively; the first common terminal is connected to the second end of the second analog front end via the closed first switch; the second common terminal is connected to the first end of the third analog front end via the closed fourth switch; the fourth common terminal is connected to the first end of the second analog front end via the closed fifth switch; and the second and third switches are configured to be open circuits.

[0011] Furthermore, in some embodiments, when the multiplexing switching device is configured in the second measurement mode of the three-phase coil voltage, the multiplexing switching device is configured such that: the first common terminal is connected to the first end of the first inductor winding of the second three-phase coil, the first end of the second inductor winding of the second three-phase coil, and the first end of the third inductor winding of the second three-phase coil; the first common terminal is connected to the second end of the second analog front end via the closed first switch; the first common terminal is connected to the first end of the third analog front end via the closed third switch; the second common terminal is connected to the second end of the first inductor winding of the second three-phase coil; the third common terminal is connected to the second end of the second inductor winding of the second three-phase coil; the fourth common terminal is connected to the second end of the third inductor winding of the second three-phase coil; and the second, fourth, and fifth switches are configured to be open circuits.

[0012] Furthermore, in some embodiments, the first, second, and third analog front-ends are respectively provided with two-stage programmable gain amplifiers and one-stage passband adjustable filters.

[0013] Furthermore, in some embodiments, the aforementioned first-stage passband adjustable filter is disposed between the aforementioned two-stage programmable gain amplifiers.

[0014] Furthermore, in some embodiments, the two-stage programmable gain amplifier includes a first-stage programmable gain amplifier and a second-stage programmable gain amplifier, wherein the first-stage programmable gain amplifier is configured as a programmable gain amplifier for coarse-tuning of signal gain, and the second-stage programmable gain amplifier is configured as a programmable gain amplifier for fine-tuning of signal gain.

[0015] In a second aspect of this disclosure, an inductive position sensor chip is provided, comprising: the multiplexing switching device as described above.

[0016] In a third aspect of this disclosure, an inductive position sensor is also provided, comprising: the multiplexing switching device as described above.

[0017] This disclosure has the following advantages over the prior art:

[0018] In some embodiments of this disclosure, the switching of different inductor coil connection methods is achieved by opening and closing a switch inside the multiplexing switching device. This avoids redesigning the circuit due to changes in the coil measurement mode, saving time and economic costs and improving circuit design flexibility. Furthermore, compared to the traditional three-phase coil measurement mode requiring six signal input terminals, some embodiments of this disclosure only require four signal input pins. The multiplexing of signal input pins is achieved through an internal coil switching switch, reducing the chip package size and the printed circuit board area, making it suitable for applications in smaller spaces. Attached Figure Description

[0019] The above and other features, advantages and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description, wherein:

[0020] Figure 1 A circuit structure diagram for an inductive position sensor chip according to some embodiments is shown;

[0021] Figure 2 A circuit structure diagram for an inductive position sensor chip according to some embodiments is shown;

[0022] Figure 3 A circuit structure diagram for an inductive position sensor chip according to some embodiments is shown;

[0023] Figure 4 A diagram is shown of a multiplexing switching device for an inductive position sensor chip according to some embodiments;

[0024] Figure 5 A diagram illustrating a voltage measurement state of a multiplexing switching device for an inductive position sensor chip according to some embodiments is shown.

[0025] Figure 6 A diagram illustrating another voltage measurement state of a multiplexing switching device for an inductive position sensor chip according to some embodiments is shown;

[0026] Figure 7 A diagram illustrating yet another voltage measurement state of a multiplexing switching device for an inductive position sensor chip according to some embodiments; and

[0027] In the various figures, the same or corresponding reference numerals indicate the same or corresponding parts. Detailed Implementation

[0028] Embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the accompanying drawings and embodiments of the present disclosure are for illustrative purposes only and are not intended to limit the scope of protection of the present disclosure. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0029] In the description of embodiments of this disclosure, the term "comprising" and similar terms should be understood as open-ended inclusion, i.e., "including but not limited to". The term "based on" should be understood as "at least partially based on". The term "one embodiment" or "this embodiment" should be understood as "at least one embodiment". The terms "first", "second", etc., may refer to different or the same objects. Other explicit and implicit definitions may also be included below. It should also be understood that the term "and / or" as used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0030] It should be understood that although the terms first, second, third, etc., may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, a first state may also be referred to as a second state, and similarly, a second state may also be referred to as a first state. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0031] It should be noted that this disclosure is not intended to invent a new AFE (Analog Front End). AFE (Analog Front End) is an abbreviation for analog front-end circuit, which is the connection point between analog signal sensors and digital signal processors. Generally, the AFE is at the very beginning of the processing chain, i.e., the input terminal, where it processes analog signals, hence the name analog front end. An AFE refers to an analog system integrating an ADC, amplifier, reference source, excitation circuit, modulation and demodulation circuit, etc., and can be widely used in various high-precision measurement fields. Compared to an ADC, an AFE has higher integration and more powerful functions, and is generally used in conjunction with an MCU. The operating principle of an AFE can be divided into the following steps: 1. Amplification: Since the analog signals directly acquired by the sensor are generally weak, the AFE amplifies the signal through its built-in PGA (Programmable Gain Amplifier) ​​to meet the signal amplitude requirements of subsequent filters and the ADC. 2. Filtering: Since the analog signals acquired by the sensor may contain some unnecessary noise and interference, the AFE filters the amplified signal through its built-in filter to improve the signal-to-noise ratio. 3. Sampling: The AFE converts the amplified and filtered analog signal into a digital signal using its built-in ADC (Analog-to-Digital Converter). The higher the sampling rate of the ADC, the higher the accuracy of the converted digital signal. 4. Digital Processing: After the above processing, the AFE sends the digital signal to the processor for digital signal processing. The processor can perform various algorithms on the digital signal, such as digital filtering, FFT (Fast Fourier Transform), and signal analysis. 5. Output: The processed digital signal can be output through various communication protocols, such as serial port output, parallel port output, and Ethernet output.

[0032] It should be understood that there are generally three ways to connect an inductive position sensor chip to the inductor coil being measured: IQ two-phase coil voltage measurement mode, three-phase coil line voltage measurement mode, and three-phase coil phase voltage measurement mode. For traditional inductive position sensors, only one coil voltage measurement mode can be selected. Once the coil connection method and corresponding voltage measurement mode are determined, any modification to the coil connection method requires a complete circuit redesign. However, it should be noted that the coil connection method and voltage measurement mode are strongly coupled, lacking flexibility. Switching between measurement modes requires hardware replacement, and redesigning the circuit incurs additional time costs. If both two-phase and three-phase coil measurements are required simultaneously, traditional solutions require at least six signal input terminals. For example, according to the circuit structures in some embodiments, they are as follows: Figure 1 , Figure 2 and Figure 3 As shown.

[0033] Figure 1A circuit structure diagram for an inductive position sensor chip according to some embodiments is shown. In this illustrated embodiment, the IQ two-phase coil voltage measurement mode is described, wherein the two ends of inductor L1 in the IQ two-phase coil are connected to terminals a and b of AFE1 via ports RX1 and RX2 in the circuit structure, respectively; and the two ends of inductor L2 in the IQ two-phase coil are connected to terminals a and b of AFE2 via ports RX3 and RX4 in the circuit structure, respectively. Since the IQ two-phase coil voltage measurement mode is relatively simple to measure and wire, it does not demonstrate the advantages of this disclosure.

[0034] Figure 2 A circuit structure diagram for an inductive position sensor chip according to some embodiments is shown. In this illustrated embodiment, a three-phase coil line voltage measurement mode is provided, wherein the right end of the inductor L1 of the three-phase coil is connected via a branch (shown as black dots) to terminal b of AFE1 via port RX2 and terminal a of AFE3 via port RX5; correspondingly, the right end of the inductor L2 of the three-phase coil is connected via a branch (shown as black dots) to terminal b of AFE2 via port RX4 and terminal a of AFE1 via port RX1; the right end of the inductor L3 of the three-phase coil is connected via a branch (shown as black dots) to terminal b of AFE3 via port RX6 and terminal a of AFE2 via port RX3; furthermore, the left ends of the inductors L1, L2, and L3 of the three-phase coil are interconnected, thereby realizing the three-phase coil line voltage measurement.

[0035] Figure 3 A circuit structure diagram for an inductive position sensor chip according to some embodiments is shown. In this illustrated embodiment, a three-phase coil phase voltage measurement mode is adopted, wherein the right end of the inductor L1 of the three-phase coil is connected to the b-terminal of AFE1 via the RX2 port; the left end of the inductor L1 of the three-phase coil is connected to the a-terminal of AFE1 via the RX1 port; similarly, the right end of the inductor L2 of the three-phase coil is connected to the b-terminal of AFE2 via the RX4 port; the left end of the inductor L2 of the three-phase coil is connected to the a-terminal of AFE2 via the RX3 port; the right end of the inductor L3 of the three-phase coil is connected to the b-terminal of AFE3 via the RX6 port; the left end of the inductor L3 of the three-phase coil is connected to the a-terminal of AFE3 via the RX5 port; correspondingly, the left ends of the inductors L1, L2, and L3 of the three-phase coil are connected to each other to realize the three-phase coil phase voltage measurement.

[0036] However, the increase in signal input terminals means that the chip needs a larger package, which will also lead to higher economic costs. In particular, in the three-phase coil line voltage measurement mode, the connection between the coil and the sensor chip will inevitably use through-hole jumpers on the printed circuit board, and the presence of through-holes will also cause signal transmission loss. In order to solve at least one of the above problems, and one or more other potential problems, this disclosure proposes a multiplexing switching device for an inductive position sensor chip, which will be described below in conjunction with the accompanying drawings and specific embodiments.

[0037] Figure 4 A diagram is shown illustrating a multiplexing switching device for an inductive position sensor chip according to some embodiments. In this illustrated embodiment, the multiplexing switching device includes: first, second, and third analog front-ends (illustrated as AFE1, AFE2, and AFE3, respectively), and further includes first, second, third, and fourth common terminals (illustrated as RX1, RX2, RX3, and RX4, respectively), and first, second, third, fourth, and fifth switches (illustrated as S1, S2, S3, S4, and S5, respectively). In the illustrated scheme, the first common terminal RX1 is configured to be connected to the first terminal a of the first analog front-end AFE1, the first terminal of the first switch S1, and the first terminal of the third switch S3; the second common terminal RX2 is configured to be connected to the first terminal a of the first analog front-end AFE1, the first terminal of the first switch S1, and the first terminal of the third switch S3. The second terminal b of analog front-end AFE1 is connected to the first terminal of the fourth switch S4; the third common terminal RX3 is configured to connect to the first terminal a of the second analog front-end AFE2 and the first terminal of the fifth switch S5; the fourth common terminal RX4 is configured to connect to the second terminal b of the third analog front-end AFE3, the first terminal of the second switch S2, and the second terminal of the fifth switch S5; the second terminals of the first switch S1 and the second terminals of the second switch S2 are configured to connect to the second terminal b of the second analog front-end AFE2; the second terminals of the third switch S3 and the second terminals of the fourth switch S4 are configured to connect to the first terminal a of the third analog front-end AFE3. The multiplexing switching device designed in this way can be used for various coil voltage measurement modes, such as: a two-phase coil voltage measurement mode (i.e., IQ two-phase coil voltage measurement mode), a three-phase coil voltage first measurement mode (i.e., three-phase coil line voltage measurement mode), and a three-phase coil voltage second measurement mode (i.e., three-phase coil phase voltage measurement mode). The three measurement modes will be described in detail below with reference to the accompanying drawings.

[0038] Figure 5A diagram illustrating a voltage measurement state of a multiplexing switching device for an inductive position sensor chip according to some embodiments is shown. In this illustrated embodiment, when the multiplexing switching device is set to a two-phase coil voltage measurement mode (i.e., IQ two-phase coil voltage measurement mode), the multiplexing switching device is configured such that: a first common terminal RX1 is connected to a first end (shown as the upper end) of the first inductor winding L1 of the two-phase coil, and obviously, RX1 is connected to the first end a of AFE1; a second common terminal RX2 is connected to a second end (shown as the lower end) of the first inductor winding L1 of the two-phase coil, and obviously, RX2 is connected to the second end b of AFE1; a third common terminal RX3 is connected to the two-phase coil... The first end (shown as the upper end in the diagram) of the second inductor winding L2 of the two-phase coil is connected. Clearly, RX3 is connected to the first end a of AFE2. The fourth common end RX4 is configured to connect to the second end (shown as the lower end in the diagram) of the second inductor winding L2 of the two-phase coil. Clearly, RX4 is connected to the second end b of AFE3, and the fourth common end RX4 is also configured to connect to the second end b of the second analog front-end AFE2 via the closed second switch S2. As shown in the illustrated embodiment, the first switch S1, the third switch S3, the fourth switch S4, and the fifth switch S5 are set to open circuit (disconnected). This achieves the IQ two-phase coil voltage measurement mode of the multiplexing switching device.

[0039] Figure 6A diagram illustrating another voltage measurement state of a multiplexing switching device for an inductive position sensor chip according to some embodiments is shown. In this illustrated embodiment, when the multiplexing switching device is set to a three-phase coil voltage first measurement mode (i.e., a three-phase coil line voltage measurement mode), the multiplexing switching device is configured such that: a first common terminal RX1 is connected to the second end (shown as the right end) of the first inductor winding L1 of the first three-phase coil; a second common terminal RX2 is connected to the second end (shown as the right end) of the second inductor winding L2 of the first three-phase coil; and a fourth common terminal RX3 is connected to the second end (shown as the right end) of the third inductor winding L3 of the first three-phase coil; further, the first end (shown as the left end) of the first inductor winding L1 of the first three-phase coil... The first common terminal RX1 is configured to be connected to the first terminal (left end) of the second inductor winding L2 of the first three-phase coil and the first terminal (left end) of the third inductor winding L3 of the first three-phase coil, respectively. The first common terminal RX1 is configured to be connected to the second terminal b of the second analog front-end AFE2 via the closed first switch S1. The second common terminal RX2 is configured to be connected to the first terminal a of the third analog front-end AFE3 via the closed fourth switch S4. The fourth common terminal RX4 is configured to be connected to the first terminal a of the second analog front-end AFE2 via the closed fifth switch S5. In addition, the second switch S2 and the third switch S3 are configured to be open (disconnected). Thus, the three-phase coil line voltage measurement mode of the multiplexing switching device is realized.

[0040] Figure 7A diagram illustrating another voltage measurement state of a multiplexing switching device for an inductive position sensor chip according to some embodiments is shown. In this illustrated embodiment, when the multiplexing switching device is set to a second three-phase coil line voltage measurement mode (i.e., a three-phase coil phase voltage measurement mode), the multiplexing switching device is configured such that: the first common terminal RX1 is connected to the first end (shown as the left end) of the first inductor winding L1 of the second three-phase coil, the first end (shown as the left end) of the second inductor winding L2 of the second three-phase coil, and the first end (shown as the left end) of the third inductor winding L3 of the second three-phase coil; the first common terminal RX1 is connected to the second end b of the second analog front-end AFE2 via a closed first switch S1, and to the first end a of the third analog front-end AFE3 via a closed third switch S3; the second common terminal RX2 is... The third common terminal RX3 is connected to the second terminal b of the first analog front-end AFE1, and the fourth common terminal RX4 is connected to the second terminal b of the third analog front-end AFE3. The second common terminal RX2 is connected to the second terminal (right end shown in the diagram) of the first inductor winding L1 of the second three-phase coil. The third common terminal RX3 is connected to the second terminal (right end shown in the diagram) of the second inductor winding L2 of the second three-phase coil. The fourth common terminal RX4 is connected to the second terminal (right end shown in the diagram) of the third inductor winding L3 of the second three-phase coil. In addition, the second switch S2, the fourth switch S4, and the fifth switch S5 are set to open circuit (disconnected). Thus, the three-phase coil phase voltage measurement mode of the multiplexing switching device is realized.

[0041] It should be understood that by setting up the aforementioned multiplexing switching device, the digital signals inside the inductive position sensor chip control the closing and opening of the multi-coil switching switch, multiplexing the signal input pins to achieve different connection methods of the inductive coils required for different measurement modes of the sensor chip. Therefore, a switch control register can be integrated inside the inductive position sensor chip, and the register value can be configured through a digital signal bus (e.g., via SPI, IIC, etc.) to realize the on / off switching of the multi-coil switching switch. When switches S1, S3, S4, and S5 are open and S2 is closed, a two-phase coil connection is completed; when switches S2 and S3 are open and S1, S4, and S5 are closed, a three-phase coil line voltage connection is completed; when switches S2, S4, and S5 are open and switches S1 and S3 are closed, a three-phase phase coil line voltage connection is completed. Thus, the signal input pins are multiplexed, and the first input pin can be used as the input terminal of up to 3 AFEs simultaneously, while the second, third, and fourth input pins can be used as the input terminals of up to 2 AFEs simultaneously.

[0042] Furthermore, due to the non-ideal on-resistance of the coil switching switch, amplitude loss occurs when the same signal reaches different AFEs, and signals from adjacent channels also interfere with each other. Therefore, in some embodiments, two-stage programmable gain amplifiers (PGAs) and a first-stage adjustable passband filter are added to the AFE. The filter is located between the two PGA stages. The gain of the PGAs is controlled by digital signals. The first-stage PGA coarsely adjusts the signal gain, and then the adjustable passband filter is designed according to the expected frequency range of interference signals. By adjusting the passband of the filter, interference signals are filtered out. The second-stage PGA finely adjusts the signal gain to ensure that the signal characteristics after passing through each AFE remain as consistent as possible, thus obtaining the clean signal required by the subsequent circuits.

[0043] Furthermore, in some embodiments, an inductive position sensor chip is also proposed, which includes the aforementioned multiplexing switching device.

[0044] Furthermore, in some embodiments, an inductive position sensor is also proposed, which includes the aforementioned multiplexing switching device.

[0045] It should also be understood that the aforementioned multiplexing switching device (i.e., installed within the inductive position sensor chip) includes: a sensor receiving inductor coil, a coil switching switch inside the sensor chip, and an AFE. The coil switching switch and AFE are connected as follows: Figure 4 As shown, it includes 5 switching switches and three AFEs. The opening and closing of the 5 switches are controlled by digital signals inside the chip to achieve three different connection methods for the receiving coil.

[0046] In some embodiments, for the IQ two-phase coil voltage measurement mode, the connection method is as follows: Figure 5 As shown. Inductor L1 is connected to input terminals a and b of AFE1, and AFE1 measures the voltage across L1. One end of inductor L2 is connected to input terminal a of AFE2. Switches S1, S3, S4, and S5 are open, and the other end of inductor L2 is connected to input terminal b of AFE2 through closed switch S2, and AFE2 measures the voltage across L2.

[0047] Furthermore, compared to the two-phase coil measurement mode, the three-phase coil measurement mode requires an additional inductor coil.

[0048] In some embodiments, for the three-phase coil line voltage measurement mode, the connection method is as follows: Figure 6As shown. One end of inductors L1 and L2 is connected to input terminals a and b of AFE1, respectively. AFE1 measures the line voltage between L1 and L2. Switches S2 and S3 are open. One end of L1 is connected to input terminal b of AFE2 through switch S1 (closed). One end of L3 is connected to input terminal a of AFE2 through switch S5 (closed). AFE2 measures the line voltage between L1 and L3. One end of L2 is connected to input terminal a of AFE3 through switch S4 (closed). L3 is connected to input terminal b of AFE3. AFE3 measures the line voltage between L2 and L3.

[0049] In some embodiments, for the three-phase coil phase voltage measurement mode, the connection method is as follows: Figure 7 As shown. The common terminal of coils L1, L2, and L3 is connected to input terminal a of AFE1, and one end of L1 is connected to input terminal b of AFE1. AFE1 performs phase voltage measurement between L1 and the common terminal. Switches S2, S4, and S5 are open, and the common terminal of the coils is connected to one input terminal b of AFE2 through the closed switch S1. One end of L2 is connected to input terminal a of AFE2. AFE2 performs phase voltage measurement between L2 and the common terminal. The common terminal of the coils is connected to one input terminal a of AFE3 through the closed switch S3. One end of L3 is connected to input terminal b of AFE3. AFE3 performs phase voltage measurement between L3 and the common terminal.

[0050] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

[0051] The above description is merely an optional embodiment of this disclosure and is not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A multiplexing switching device for an inductive position sensor chip, comprising: The first analog front-end, the second analog front-end, and the third analog front-end are characterized in that the multiplexing switching device is further provided with a first common terminal, a second common terminal, a third common terminal, a fourth common terminal, and a first switch, a second switch, a third switch, a fourth switch, and a fifth switch; The first common terminal is configured to be connected to the first terminal of the first analog front-end, the first terminal of the first switch, and the first terminal of the third switch; the second common terminal is configured to be connected to the second terminal of the first analog front-end and the first terminal of the fourth switch; the third common terminal is configured to be connected to the first terminal of the second analog front-end and the first terminal of the fifth switch; the fourth common terminal is configured to be connected to the second terminal of the third analog front-end, the first terminal of the second switch, and the second terminal of the fifth switch; the second terminals of the first switch and the second terminals of the second switch are configured to be connected to the second terminal of the second analog front-end; the second terminals of the third switch and the second terminals of the fourth switch are configured to be connected to the first terminal of the third analog front-end.

2. The multiplexing switching device according to claim 1, characterized in that, The multiplexing switching device is configured to include: Two-phase coil voltage measurement mode, three-phase coil voltage first measurement mode, three-phase coil voltage second measurement mode.

3. The multiplexing switching device according to claim 2, characterized in that, When the multiplexing switching device is set to two-phase coil voltage measurement mode... The multiplexing switching device is configured to: The first common terminal is configured to be connected to the first end of the first inductor winding of the two-phase coil, and the second common terminal is configured to be connected to the second end of the first inductor winding of the two-phase coil. The third common terminal is configured to be connected to the first end of the second inductor winding of the two-phase coil, the fourth common terminal is configured to be connected to the second end of the second inductor winding of the two-phase coil, and the fourth common terminal is also configured to be connected to the second end of the second analog front end via the closed second switch; The first switch, the third switch, the fourth switch, and the fifth switch are set to open circuit.

4. The multiplexing switching device according to claim 2, characterized in that, When the multiplexing switching device is set to the first measurement mode of three-phase coil voltage, The multiplexing switching device is configured to: The first common terminal is configured to be connected to the second end of the first inductor winding of the first three-phase coil, the second common terminal is configured to be connected to the second end of the second inductor winding of the first three-phase coil, and the fourth common terminal is configured to be connected to the second end of the third inductor winding of the first three-phase coil; the first end of the first inductor winding of the first three-phase coil is configured to be interconnected with the first end of the second inductor winding of the first three-phase coil and the first end of the third inductor winding of the first three-phase coil, respectively. The first common terminal is configured to be connected to the second terminal of the second analog front end via the closed first switch; The second common terminal is configured to be connected to the first terminal of the third analog front end via the closed fourth switch; The fourth common terminal is configured to be connected to the first terminal of the second analog front end via the closed fifth switch; The second and third switches are set to open circuit.

5. The multiplexing switching device according to claim 2, characterized in that, When the multiplexing switching device is set to the second measurement mode of three-phase coil voltage... The multiplexing switching device is configured to: The first common terminal is configured to be connected to the first end of the first inductor winding of the second three-phase coil, the first end of the second inductor winding of the second three-phase coil, and the first end of the third inductor winding of the second three-phase coil. The first common terminal is configured to be connected to the second terminal of the second analog front end via the closed first switch; the first common terminal is configured to be connected to the first terminal of the third analog front end via the closed third switch; The second common terminal is configured to be connected to the second terminal of the first inductor winding of the second three-phase coil; The third common terminal is configured to be connected to the second terminal of the second inductor winding of the second three-phase coil; The fourth common terminal is configured to be connected to the second terminal of the third inductor winding of the second three-phase coil; The second, fourth, and fifth switches are set to open circuit.

6. The multiplexing switching device according to claim 1, characterized in that, The first analog front-end, the second analog front-end, and the third analog front-end are each equipped with two stages of programmable gain amplifiers and one stage of passband adjustable filter.

7. The multiplexing switching device according to claim 6, characterized in that, The first-stage passband adjustable filter is positioned between the two-stage programmable gain amplifiers.

8. The multiplexing switching device according to claim 6, characterized in that, The two-stage programmable gain amplifier includes a first-stage programmable gain amplifier and a second-stage programmable gain amplifier, wherein the first-stage programmable gain amplifier is configured as a programmable gain amplifier for coarse-tuning of signal gain, and the second-stage programmable gain amplifier is configured as a programmable gain amplifier for fine-tuning of signal gain.

9. An inductive position sensor chip, characterized by include: The multiplexing switching device as described in any one of claims 1-8.

10. An inductive position sensor characterized by, include: The multiplexing switching device as described in any one of claims 1-8.

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