Multifunctional multiplex interface circuit based on angle sensor

Abstract

The utility model discloses a multifunctional multiplexing interface circuit based on an angle sensor, which comprises a power supply circuit, a protection circuit, an angle sensor U3, an encoder interface P1 and a plurality of groups of bidirectional level conversion circuits, and is characterized in that the power supply circuit is electrically connected with the protection circuit, the angle sensor U3 and the bidirectional level conversion circuits; and the protection circuit is electrically connected with the encoder interface P1. The utility model relates to the technical field of angle sensors. According to the utility model, bidirectional conversion of any level of the angle sensor U3 is realized through the MOS tube in the bidirectional level conversion circuit, an industrial level product application interface is compatible, the circuit is simple, the integration level is high, chip-level calibration and parameter configuration after the angle sensor U3 is assembled into a finished product are realized, the assembly of the angle sensor U3 is compensated, and the cost is reduced. Errors caused by environmental influences are reduced, the angle detection precision is greatly improved, and the configuration problem of mass production of angle sensors is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of angle sensors, in particular to a multifunctional multiplexing interface circuit based on angle sensors. Background Art

[0002] Angle sensors are basic sensor accessories in the current industrial and automotive industries. Angle acquisition of all transmission components is inseparable from angle sensors. With the rapid development of smart device / smart sensor technology, the use of angle sensors is constantly expanding, and the demand for miniaturization of angle sensor structures is also increasing day by day.

[0003] The current angle sensors are all based on TTL level to achieve the production configuration and calibration of angle sensors. Once assembled into products, the configuration interface of the angle sensor and the chip-level calibration function cannot be realized using industrial-grade (24V) and automotive-grade (12V) level interface circuits. Or in order to maintain the configuration function, additional configuration interfaces are added to the product to generate redundant interfaces, resulting in the inability to miniaturize the product and complicated production processes. This setting method brings great inconvenience to the production configuration of angle sensor products and the improvement of angle detection accuracy.

[0004] Therefore, the utility model provides a multifunctional multiplexing interface circuit based on an angle sensor to solve the above problems. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a multifunctional multiplexing interface circuit based on an angle sensor, which solves the above problems.

[0006] To achieve the above objectives, the utility model is implemented through the following technical solutions: a multifunctional multiplexing interface circuit based on an angle sensor, including a power supply circuit, a protection circuit, an angle sensor U3, an encoder interface P1 and several groups of bidirectional level conversion circuits, the power supply circuit is electrically connected to the protection circuit, the angle sensor U3 and the bidirectional level conversion circuit, the protection circuit is electrically connected to the encoder interface P1, and the angle sensor U3 is electrically connected to the encoder interface P1 through the bidirectional level conversion circuit.

[0007] Preferably, the pin 1 of the angle sensor U3 is signal-connected to the pin 3 of the encoder interface P1 through a group of bidirectional level conversion circuits, the pin 2 of the angle sensor U3 is signal-connected to the pin 4 of the encoder interface P1 through a group of bidirectional level conversion circuits, the pin 3 of the angle sensor U3 is signal-connected to the pin 5 of the encoder interface P1 through a group of bidirectional level conversion circuits, the pin 4 of the angle sensor U3 is signal-connected to the pin 6 of the encoder interface P1 through a group of bidirectional level conversion circuits, the pin 5 and pin 15 of the angle sensor U3 are both grounded, and the pin 7 and pin 8 of the angle sensor U3 are electrically connected to the output end of the power supply circuit.

[0008] Preferably, the bidirectional level conversion circuit consists of a MOS transistor and two resistors.

[0009] Preferably, the power supply circuit consists of a low dropout linear regulator (LDO) and two capacitors.

[0010] Preferably, the protection circuit consists of a fuse F1 and a TVS diode D1.

[0011] Beneficial Effects

[0012] The present utility model provides a multi-functional multiplexing interface circuit based on an angle sensor. Compared with the prior art, it has the following beneficial effects:

[0013] In the multi-functional multiplexing interface circuit based on an angle sensor, the MOS transistor in the bidirectional level conversion circuit realizes the bidirectional conversion of any level of the angle sensor U3, which is compatible with the industrial level product application interface. The circuit is simple, with high integration, realizes the chip-level calibration and parameter configuration of the angle sensor U3 after being assembled into a finished product, compensates for the assembly of the angle sensor U3, reduces the error caused by environmental influence, greatly improves the accuracy of angle detection, and solves the configuration problem in the mass production of angle sensors. Description of the Drawings

[0014] Figure 1 is the overall circuit block diagram of the present utility model;

[0015] Figure 2 is the circuit diagram of the angle sensor U3 of the present utility model;

[0016] Figure 3 is the circuit diagram of the encoder interface P1, power supply circuit and protection circuit of the present utility model;

[0017] Figure 4 is the circuit diagram of the bidirectional level conversion circuit of the present utility model. Detailed Embodiments

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0019] Embodiment:

[0020] Please refer to Figures 1-4 , a multifunctional multiplexing interface circuit based on an angle sensor, including a power supply circuit, a protection circuit, an angle sensor U3, an encoder interface P1, and several groups of bidirectional level conversion circuits. The power supply circuit is electrically connected to the protection circuit, the angle sensor U3, and the bidirectional level conversion circuits. The protection circuit is electrically connected to the encoder interface P1. The angle sensor U3 is electrically connected to the encoder interface P1 through the bidirectional level conversion circuits.

[0021] The 1st pin of the angle sensor U3 is signal-connected to the 3rd pin of the encoder interface P1 through a group of bidirectional level conversion circuits. The 2nd pin of the angle sensor U3 is signal-connected to the 4th pin of the encoder interface P1 through a group of bidirectional level conversion circuits. The 3rd pin of the angle sensor U3 is signal-connected to the 5th pin of the encoder interface P1 through a group of bidirectional level conversion circuits. The 4th pin of the angle sensor U3 is signal-connected to the 6th pin of the encoder interface P1 through a group of bidirectional level conversion circuits. The 5th pin and the 15th pin of the angle sensor U3 are both grounded. The 7th pin and the 8th pin of the angle sensor U3 are electrically connected to the output end of the power supply circuit. The bidirectional level conversion circuit consists of a MOS transistor and two resistors. The power supply circuit consists of a low-dropout linear regulator (LDO) and two capacitors. The protection circuit consists of a fuse F1 and a TVS diode D1.

[0022] In this embodiment, the encoder interface P1 has ENC interface A, ENC interface B, and ENC interface Z, and is multiplexed into SPI / IIC / UART as the configuration interface of the angle sensor U3. The 2nd pin of the encoder interface P1 is connected to an input voltage of 5 - 24V, and the overcurrent protection function is realized through the set fuse F1. The TVS diode D1 combined with the fuse F1 can realize the overvoltage protection and surge protection functions. At the same time, the 24V input voltage is converted from a low level to VCC through a low-dropout linear regulator (LDO) to supply power to the angle sensor U3. The angle sensor U3 is a digital angle sensor, and its IO interface has a multiplexing function, and also has SPI / IIC / UART configuration interfaces, as well as a standard ENC (1.8 - 5V) interface. For the angle sensor U3 in this embodiment, its parameters can be written and configured through the configuration interface or the automatic calibration function can be enabled to improve the accuracy of the angle sensor. The IO interface of the angle sensor U3 is connected to a bidirectional level conversion circuit, and the bidirectional level conversion circuit has one or more bidirectional multiplexing interfaces according to the IO interface of the angle sensor.

[0023] The working principle of the bidirectional level conversion circuit is as follows. Here, MOS transistor Q1B in Figure 4 is described, and the working principles of the remaining bidirectional level conversion circuits are similar, which are divided into the following four states:

[0024] 1. When the angle sensor MOSI AG / B outputs a high level: The Vgs (gate-source voltage) of MOS transistor Q1B = 0, the MOS transistor is turned off, and the ENC_B interface is pulled up to VDD by resistor R5.

[0025] 2. When MOSI AG / B outputs a low level: The Vgs of MOS transistor Q1B = VCC, which is greater than the conduction voltage, the MOS transistor is turned on, and ENC_B is pulled to a low level through the MOS transistor.

[0026] 3. When ENC_B outputs a high level: The Vgs of MOS transistor Q1B remains unchanged, the MOS remains in the off state, and MOSI AG / B is pulled up to VCC by resistor R1.

[0027] 4. When ENC_B outputs a low level: The MOS transistor is not conducting, but it has a crystal diode. The crystal diode in the MOS transistor pulls MOSI AG / B down to a low level. At this time, Vgs is approximately equal to VCC, the MOS transistor is turned on, and further pulls down the voltage of MOSI AG / B.

[0028] In this embodiment, the low level refers to equal to or close to 0V, VCC is 1.8 - 5V, VDD is 5 - 30V, and the high level refers to equal to or close to the power supply voltage.

[0029] The utility model realizes the bidirectional conversion of any level of the angle sensor U3 through the MOS tube in the bidirectional level conversion circuit, which is compatible with the industrial level product application interfaces (24V ENC / open-drain ENC). The circuit is simple and has a high integration level. It realizes the chip-level calibration and parameter configuration of the angle sensor U3 after being assembled into a finished product, compensates for the assembly of the angle sensor U3, reduces the error caused by environmental influence, greatly improves the accuracy of angle detection, and solves the configuration problem in the mass production of angle sensors.

[0030] Meanwhile, the content not detailedly described in this specification belongs to the prior art well-known to those skilled in the art.

[0031] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or sequence between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0032] Although the embodiments of the utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the utility model. The scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A multifunctional multiplexing interface circuit based on an angle sensor, characterized in that: It includes a power supply circuit, a protection circuit, an angle sensor U3, an encoder interface P1 and several groups of bidirectional level conversion circuits. The power supply circuit is electrically connected to the protection circuit, the angle sensor U3 and the bidirectional level conversion circuit. The protection circuit is electrically connected to the encoder interface P1. The angle sensor U3 is electrically connected to the encoder interface P1 through the bidirectional level conversion circuit.

2. A multifunctional multiplexing interface circuit based on an angle sensor according to claim 1, characterized in that: Pin 1 of the angle sensor U3 is connected to pin 3 of the encoder interface P1 through a group of bidirectional level conversion circuit signals, pin 2 of the angle sensor U3 is connected to pin 4 of the encoder interface P1 through a group of bidirectional level conversion circuit signals, pin 3 of the angle sensor U3 is connected to pin 5 of the encoder interface P1 through a group of bidirectional level conversion circuit signals, pin 4 of the angle sensor U3 is connected to pin 6 of the encoder interface P1 through a group of bidirectional level conversion circuit signals, pins 5 and 15 of the angle sensor U3 are both grounded, and pins 7 and 8 of the angle sensor U3 are electrically connected to the output end of the power supply circuit.

3. A multifunctional multiplexing interface circuit based on an angle sensor according to claim 2, characterized in that: The bidirectional level conversion circuit is composed of a MOS tube and two resistors.

4. The multifunctional multiplexing interface circuit based on an angle sensor according to claim 2, characterized in that: The power supply circuit is composed of a low voltage dropout linear regulator LDO and two capacitors.

5. The multifunctional multiplexing interface circuit based on the angle sensor according to claim 2, characterized in that: The protection circuit is composed of a fuse F1 and a TVS diode D1.

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