Automobile seat motor current type hall matching circuit

Abstract

The utility model discloses a kind of automobile seat motor current type hall matching circuit, cooperate with hall sensor, it is characterized in that, including signal input and ESD protection module, level matching module, signal conversion module and output MCU module, the signal input and ESD protection module input set hall sensor signal and carry out electrostatic protection, output to the level matching module, the level matching module is matched by single pull-up resistor and the internal resistance of hall sensor, the level of hall sensor is judged and output to the signal conversion module, the voltage variation of hall sensor is converted into conducting signal by the signal conversion module, after signal shaping, output to MCU by output MCU module, circuit composition structure is simple, easy to realize.

Description

Technical Field

[0001] This utility model relates to the field of automotive circuit technology, specifically to an external matching circuit based on a current-type Hall sensor. Background Technology

[0002] In the automotive industry, with the development of new energy, more and more comfort features such as in-car seats are being added. Seat motors are also gradually switching from sensorless to having built-in current-type Hall sensors to collect seat position data and improve comfort.

[0003] Currently, there are more and more motors in individual seats. Each motor has its own Hall sensor, which has resistance and power requirements for the external interface matching circuit. In the existing technology, multiple resistors are usually set in parallel in the external matching circuit to meet the matching requirements of the Hall sensor. This makes the overall structure of the external matching circuit complex and difficult to implement in hardware circuits. It also increases the layout space, occupies most of the space inside the seat, and increases the manufacturing cost.

[0004] Therefore, providing an external matching circuit with a simple structure, easy implementation, and small layout space to match and connect with a current-type Hall sensor has become an urgent problem to be solved in this field. Utility Model Content

[0005] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a current-type Hall matching circuit for automotive seat motors that is simple in structure, easy to implement, and can reduce layout space.

[0006] To achieve the above objectives, the present invention provides a current-type Hall matching circuit for an automotive seat motor, which works in conjunction with a Hall sensor. The circuit includes a signal input and ESD protection module, a level matching module, a signal conversion module, and an output MCU module. The signal input and ESD protection module receives the Hall sensor signal and performs electrostatic discharge protection, then outputs it to the level matching module. The level matching module matches the Hall sensor's internal resistance with a single pull-up resistor, determines the Hall sensor's voltage level, and outputs it to the signal conversion module. The signal conversion module converts the Hall sensor's voltage change into a conduction signal, which, after signal shaping, is output to the MCU module.

[0007] Furthermore, the signal input and ESD protection module includes a Hall input port, a 40th capacitor, and a 49th resistor. The Hall input port is connected to a Hall sensor, one end of the 40th capacitor is connected to the Hall input port and the other end is grounded, and one end of the 49th resistor is connected to the Hall input port and the other end is connected to the output MCU module.

[0008] Furthermore, the level matching module includes a twelfth resistor, the first end of which is connected to a power supply, the second end of which is connected to a signal conversion module, and is connected in series with the internal resistor of the Hall sensor.

[0009] Furthermore, the signal conversion module includes a third switch, the base of which is connected to the twelfth resistor through the thirtieth resistor and also to the first end of the thirty-ninth resistor, the emitter of which is connected to the power supply through the second end of the thirty-ninth resistor, and the collector of which is connected to the output MCU module.

[0010] Furthermore, the output MCU module includes a fortieth resistor and a forty-first capacitor. The first end of the fortieth resistor is connected to the collector of the third switch, and the second end is connected to the Hall input MCU port. The forty-first capacitor is connected in parallel with the forty-ninth resistor, with one end connected to the Hall input MCU port and the other end grounded.

[0011] The current-type Hall matching circuit for automotive seat motors provided by this invention uses a single pull-up resistor to match the internal resistance of the Hall sensor, reducing layout space. The overall circuit composition is simple and easy to implement in hardware, effectively overcoming the problems existing in the prior art. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0013] Figure 1 System block diagram of a current-type Hall effect matching circuit for an automotive seat motor;

[0014] Figure 2 This is a circuit diagram for a current-type Hall effect matching circuit for a car seat motor. Detailed Implementation

[0015] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the following description, in conjunction with specific illustrations, further elaborates on this utility model.

[0016] See Figure 1 The diagram shows an example of a current-type Hall matching circuit for an automotive seat motor provided by this utility model.

[0017] As shown in the figure, the current-type Hall matching circuit for the automotive seat motor in this example mainly includes a signal input and ESD protection module 1, a level matching module 2, a signal conversion module 3, and an output MCU module 4. The signal input and ESD protection module 1 receives the Hall sensor signal and performs electrostatic protection, and outputs it to the level matching module 2. The level matching module 2 matches the internal resistance of the Hall sensor with a single pull-up resistor, determines the level of the Hall sensor, and outputs it to the signal conversion module 3. The signal conversion module 3 converts the voltage change of the Hall sensor signal into a conduction signal, and outputs it to the output MCU module 4 after signal shaping. The overall circuit composition is simple and easy to implement in hardware, which can effectively overcome the problems existing in the prior art.

[0018] Combination Figure 1 and Figure 2 The signal input and ESD protection module 1 includes a Hall input port (Hall_Input), a 40th capacitor (C40), and a 49th resistor (R49). The Hall input port (Hall_Input) is connected to a Hall sensor to receive a Hall sensor signal. One end of the 40th capacitor (C40) is connected to the Hall input port (Hall_Input), and the other end is grounded. One end of the 49th resistor (R49) is connected to the Hall input port (Hall_Input), and the other end is connected to the output MCU module 4. The 40th capacitor (C40) absorbs high-voltage electrostatic pulses to protect the downstream circuitry. The 49th resistor (R49) forms an ESD current-limiting resistor. The 40th capacitor and C40 form an RC filter network, which can effectively achieve port electrostatic protection.

[0019] Furthermore, the level matching module 2 includes a twelfth resistor R12. The first end of the twelfth resistor R12 is connected to the power supply VCC12, and the second end is connected to the signal conversion module and connected in series with the internal resistance of the Hall sensor. The single twelfth resistor R12 is used as a pull-up resistor to match the internal resistance of the Hall sensor and to divide the voltage with the internal resistance of the Hall sensor to determine the effective level of the Hall sensor. The open / short circuit state of the Hall sensor switch is converted into a clear voltage signal, including high level and low level.

[0020] In conjunction with this, the signal conversion module 3 includes a third switch Q3. The base of the third switch Q3 is connected to the twelfth resistor R12 through the thirtieth resistor R30, thereby connecting to the level matching module 2 to input the voltage signal from the Hall sensor. The base of the third switch Q3 is also connected to the first terminal of the thirty-ninth resistor R39. The emitter of the third switch Q3 is connected to the power supply VCC12 through the second terminal of the thirty-ninth resistor R39. The collector of the third switch Q3 is connected to the output MCU module 4, so that the voltage change of the Hall sensor causes the third switch Q3 to conduct, thereby acquiring the voltage change and outputting it to the MCU module 4.

[0021] Furthermore, MCU module 4 includes a 40th resistor R40 and a 41st capacitor C41. The first end of the 40th resistor R40 is connected to the collector of the third switch Q3, and the second end is connected to the Hall input MCU port Hall_Input_MCU, so that the 40th resistor R40 can output a current-limiting resistor to protect the Hall input MCU port Hall_Input_MCU. The 41st capacitor C41 is connected in parallel with the 49th resistor R49, with one end connected to the Hall input MCU port Hall_Input_MCU and the other end grounded, so that the 41st capacitor C41 can filter high-frequency noise, improve signal stability, and achieve signal shaping.

[0022] This constitutes the current-type Hall matching circuit for the automotive seat motor provided by the present invention. The output terminal of the Hall sensor is connected to the Hall input port Hall_Input of this circuit, and enters the core circuit through the series resistor forty-ninth resistor R49. The fortieth capacitor C40 is connected in parallel between the Hall input port Hall_Input and GND for electrostatic protection and filtering. The twelfth resistor R12 is pulled up to the power supply VCC12 and forms a voltage divider network with the internal resistance of the Hall sensor. The output node of the twelfth resistor R12 is connected to the base of the third switch Q3 through the third resistor R30, matching the internal resistance of the Hall sensor. The system determines the effective level of the Hall sensor. The collector of the third switch Q3 is connected to the power supply VCC12 through the thirty-ninth resistor R39. At the same time, the output of the collector of the third switch Q3 is sent to the Hall input MCU port Hall_Input_MCU through the fortieth resistor R40 in series, converting the voltage change of the Hall sensor into the conduction signal of the third switch Q3. The forty-first capacitor C41 is connected in parallel between the Hall input MCU port Hall_Input_MCU and GND, forming a complete Hall sensor signal acquisition, electrostatic protection, level matching, signal conversion, and finally output MCU interface link.

[0023] When the Hall sensor signal is valid, the internal switch of the Hall sensor closes to ground, and the Hall input port Hall_Input generates a voltage change. The twelfth resistor R12 determines the valid level of the Hall sensor and feeds back the voltage change collected by this circuit to the third switch Q3, changing the conduction state of the third switch Q3. The change is then transmitted to the MCU for detection through the Hall input MCU port Hall_Input_MCU.

[0024] As can be seen from the above, the current-type Hall matching circuit for the car seat motor provided by this utility model is based on a stable and reliable circuit module, with a simple overall composition and easy hardware circuit implementation.

[0025] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A current-type Hall effect matching circuit for an automotive seat motor, used in conjunction with a Hall effect sensor, characterized in that, The system includes a signal input and ESD protection module, a level matching module, a signal conversion module, and an output MCU module. The signal input and ESD protection module takes in the Hall sensor signal and performs electrostatic discharge protection, then outputs it to the level matching module. The level matching module matches the Hall sensor's internal resistance with a single pull-up resistor, determines the Hall sensor's voltage level, and outputs it to the signal conversion module. The signal conversion module converts the Hall sensor's voltage change into a conduction signal, which is then shaped and output to the MCU module.

2. The automotive seat motor current-type Hall matching circuit according to claim 1, characterized in that, The signal input and ESD protection module includes a Hall input port, a 40th capacitor, and a 49th resistor. The Hall input port is connected to a Hall sensor. One end of the 40th capacitor is connected to the Hall input port, and the other end is grounded. One end of the 49th resistor is connected to the Hall input port, and the other end is connected to the output MCU module.

3. The automotive seat motor current-type Hall matching circuit according to claim 2, characterized in that, The level matching module includes a twelfth resistor, the first end of which is connected to a power supply, the second end of which is connected to a signal conversion module and connected in series with the internal resistor of the Hall sensor.

4. The automotive seat motor current-type Hall matching circuit according to claim 3, characterized in that, The signal conversion module includes a third switch. The base of the third switch is connected to the twelfth resistor through the thirtieth resistor and also to the first end of the thirty-ninth resistor. The emitter of the third switch is connected to the power supply through the second end of the thirty-ninth resistor, and the collector is connected to the output MCU module.

5. The automotive seat motor current-type Hall matching circuit according to claim 4, characterized in that, The output MCU module includes a 40th resistor and a 41st capacitor. The first end of the 40th resistor is connected to the collector of the third switch, and the second end is connected to the Hall input MCU port. The 41st capacitor is connected in parallel with the 49th resistor, with one end connected to the Hall input MCU port and the other end grounded.

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