Integrated circuit of zero-gravity seat controller

Abstract

According to the integrated circuit of the zero-gravity seat controller, when a seat is powered on, a 12V power supply is converted into a 5V power supply through a DC-DC chip, and one path of the 5V power supply is converted into a 3.3 V power supply through an LDO chip and supplies power to an MCU and all circuits (except a Bluetooth module); the other path is converted into a 3.3 V power supply without clutter through a Bluetooth isolation power supply and an LDO (Low Dropout Regulator) to be supplied to a Bluetooth control module, the MCU controls a motor to run through a motor control circuit, controls motor overcurrent judgment through a motor current detection circuit, and controls starting and stopping positions of the motor through a motor pulse voltage comparison conversion circuit; on the other hand, the Bluetooth audio module is in serial port communication with the internal MCU, data are exchanged through serial port communication, linkage of the mobile phone and the seat controller is achieved, and the seat controller controls the 4D massager to vibrate and massage.

Description

Technical Field

[0001] The utility model belongs to the technical field of seat controller circuits, and particularly relates to an integrated circuit of a zero-gravity seat controller. Background Art

[0002] With the increasing popularity of automobiles, consumers' requirements are also getting higher and higher. Besides price factors, people increasingly pay attention to the safety, comfort, etc. of automobiles. The zero-gravity seat is not only the key to improving the comfort of passengers, but also the key technology for developing high-quality automobile seats and forming the competitiveness of the automobile seat market.

[0003] The existing integrated circuit of an automobile seat controller can indeed control the motor to adjust the seat to the zero-gravity state, but it lacks the function of linking the controller with the mobile phone, resulting in limitations in the control of the zero-gravity seat. Therefore, the utility model proposes an integrated circuit of a zero-gravity seat controller to solve the above problems. Summary of the Utility Model

[0004] The utility model provides an integrated circuit of a zero-gravity seat controller, aiming to solve the problems put forward in the background art.

[0005] The utility model is realized as follows. An integrated circuit of a zero-gravity seat controller includes a power voltage conversion unit, an MCU control unit, a current acquisition unit, a motor drive unit, a motor pulse voltage conversion unit, and a Bluetooth audio control module unit;

[0006] The power voltage conversion unit includes a power input module, a 5V power conversion module, and a 3.3V power conversion module. The power input module is used to output a stable 12V power voltage. The 5V power conversion module is used to convert the 12V power voltage into a 5V power voltage. The 3.3V power conversion module is used to convert the 5V power voltage into a 3.3V power voltage;

[0007] The MCU control unit includes a 3.3V power supply filtering circuit, a reset circuit, a motor rotation I / O control module, a clock circuit, a motor current AD port acquisition module, a motor pulse acquisition I / O port module, a Bluetooth serial communication module, a serial screen serial communication module, and a spare serial communication module. The 3.3V power supply filtering circuit is used to provide a stable and reliable 3.3V power supply for the MCU. The reset circuit is used to reset the single-chip microcomputer when it starts up or malfunctions. The motor rotation I / O port control module is mainly used to output high and low levels. The clock circuit provides a reference clock signal for the MCU and is used to generate the clock signal required for the operation of the single-chip microcomputer. The motor current AD port acquisition module is used to acquire the working current and voltage of the motor. The motor pulse acquisition I / O port module is used to acquire the number of pulses of the motor during operation. The Bluetooth serial communication module is used for the communication interface between the MCU and Bluetooth. The serial screen serial communication module is used for the communication interface between the serial screen and the MCU. The spare serial communication module is used to reserve a spare serial communication interface;

[0008] The current acquisition unit includes a voltage follower and an operational amplifier circuit. The voltage follower is used to isolate the buffer circuit of the power supply and reduce the interference of the input power supply from the outside. The operational amplifier circuit is used to amplify the acquired current signal;

[0009] The motor drive unit includes a relay control module and a motor current sampling module. The relay control module is used to control the opening and closing of the relay, and thus control the opening and closing of the motor. The motor current sampling module is used to acquire the voltage signal and amplify it to the AD sampling port of the MCU;

[0010] The motor pulse voltage conversion unit includes a two-channel voltage comparator composed of LM393;

[0011] The Bluetooth audio control module unit includes a 5V Bluetooth isolated power supply, a Bluetooth power supply, a Bluetooth audio module, and an audio output module. The 5V Bluetooth isolated power supply is used to isolate the input 5V power supply and ensure stable output. The Bluetooth power supply is used to supply power to the Bluetooth audio module. The Bluetooth audio module is used for mobile phone and Bluetooth communication and outputs an audio differential signal. The audio output module is used to convert the audio differential signal into an audio signal and output it to an external earphone and convert it into sound.

[0012] Preferably, the power input unit outputs a stable 12V power supply voltage through the capacitive filtering of the input circuit and the TVS to suppress transient spike voltages. The 5V power conversion unit converts the 12V power supply voltage into a 5V power supply voltage through a DC-DC buck conversion circuit. The 3.3V power conversion unit converts the 5V power supply voltage into a 3.3V power supply voltage through an LDO buck circuit.

[0013] Preferably, the motor current AD port acquisition module acquires the working current and voltage of the motor, and turns off and turns on the motor by judging the magnitude of the working current and voltage of the motor; the motor pulse acquisition I / O port module is used to acquire the number of pulses of the motor during operation, and controls the start and stop positions of the motor by increasing or decreasing the number of motor pulses.

[0014] Preferably, the 3.3V input voltage is converted into a 1.27V voltage through a voltage-dividing resistor, and the 1.27V voltage is input through the voltage follower. The voltage follower is a power isolation buffer and isolation circuit, which reduces the interference of the input power supply from the outside and outputs a stable and reliable 1.27V voltage.

[0015] Preferably, the working principle of the relay control module is as follows: the MCU outputs a driving motor control signal to the Darlington tube, and the Darlington tube amplifies the signal of the MCU driving the motor to the relay to control the opening and closing of the relay, and then controls the opening and closing of the motor; the working principle of the motor current sampling module is as follows: the sampling resistor uses a 20mΩ constantan wire resistor to sample the current, converts the working current of the motor into a voltage signal through the 20mΩ constantan wire resistor, and the voltage signal is amplified by the current acquisition unit and given to the AD sampling port of the MCU.

[0016] Preferably, the working principle of the 2-channel voltage comparator composed of LM393 is as follows: the 12V voltage is input to pins 2 and 6 of LM393 through the reference voltage composed of voltage-dividing resistors, the pulse voltage of the motor is input to pins 3 and 5, and by comparing with the reference voltage, high and low levels are output to the base of the triode to control the conduction and cutoff of the triode, and then high and low levels are output to the I / O port of the MCU. The MCU starts counting through the high and low level pulses of the I / O port.

[0017] Preferably, the Bluetooth power supply is a buck circuit composed of an LDO chip. After 5V is input to the Bluetooth power supply, it is converted into a 3.3V power supply by the LDO chip to supply power to the Bluetooth audio module.

[0018] Compared with the prior art, the beneficial effects of the present utility model are:

[0019] When the seat is powered on, the 12V power supply is converted into a 5V power supply through a DC-DC chip. One path of the 5V power supply is converted into a 3.3V power supply through an LDO chip and supplies power to the MCU and each part of the circuit (except the Bluetooth module). Another path is converted into a 3.3V power supply without clutter through a Bluetooth isolation power supply and an LDO to supply power to the Bluetooth control module. The MCU controls the operation of the motor through the motor control circuit, judges the overcurrent of the motor through the motor current detection circuit, and controls the starting and stopping positions of the motor through the motor pulse voltage comparison and conversion circuit, so as to achieve various states of the zero-gravity seat. On the other hand, the Bluetooth audio module communicates with the internal MCU through a serial port, exchanges data through the serial port communication, realizes the linkage between the mobile phone and the seat controller, and the seat controller controls the 4D massager to vibrate and massage. Description of the Drawings

[0020] Figure 1 It is the circuit diagram of the power supply voltage conversion unit in the present invention;

[0021] Figure 2 It is the circuit diagram of the motor pulse acquisition circuit in the MCU control unit of the present invention;

[0022] Figure 3 It is the circuit diagram of the motor rotation I / O control module in the MCU control unit of the present invention;

[0023] Figure 4 It is the circuit diagram of the motor current AD port acquisition module in the MCU control unit of the present invention;

[0024] Figure 5 It is the MCU power supply filtering circuit in the MCU control unit of the present invention;

[0025] Figure 6 It is the circuit diagram of the current acquisition unit in the present invention;

[0026] Figure 7 It is the circuit diagram of the driving relay module in the motor driving unit of the present invention;

[0027] Figure 8 It is the circuit diagram of the relay controlling the motor module in the motor driving unit of the present invention;

[0028] Figure 9 It is the circuit diagram of the motor pulse voltage conversion unit in the present invention;

[0029] Figure 10 It is the circuit diagram of the Bluetooth audio module in the Bluetooth audio control module unit of the present invention;

[0030] Figure 11 It is the circuit diagram of the 5V Bluetooth isolation power supply in the Bluetooth audio control module unit of the present invention;

[0031] Figure 12 This is the circuit diagram of the audio output module in the Bluetooth audio control module unit of the present utility model. Specific embodiments

[0032] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments.

[0033] The components of the embodiments of the present utility model usually described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the claimed present utility model, but merely represents the selected embodiments of the present utility model.

[0034] All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0035] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0036] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0037] The present utility model provides a technical solution: an integrated circuit of a zero-gravity seat controller, and the zero-gravity integrated circuit includes the following partial circuits: a power voltage conversion unit, an MCU control unit, a current acquisition unit, a motor drive unit, a motor pulse voltage conversion unit, and a Bluetooth audio control module unit; the principles of each unit are as follows:

[0038] 1. Please refer to Figure 1 , the power voltage conversion unit:

[0039] The power supply voltage conversion unit includes a power input module, a 5V power conversion module, and a 3.3V power conversion module. The working principle is as follows: The 12V power supply voltage passes through the capacitance filtering of the input circuit and the TVS to suppress the transient peak voltage, and a stable 12V voltage is output. The 12V voltage is converted into a 5V power supply through a DC-DC buck conversion circuit, and the 5V power supply is converted into a 3.3V power supply through an LDO buck circuit.

[0040] 2. Please refer to Figures 2 to 5 , the MCU control unit:

[0041] The MCU control unit circuit includes a 3.3V power supply filtering circuit, a reset circuit, a motor rotation I / O control module, a clock circuit, a motor current AD port acquisition module, a motor pulse acquisition I / O port module, a Bluetooth serial port communication module, a serial screen serial port communication module, and a spare serial port communication module;

[0042] The 3.3V power supply filtering circuit provides a stable and reliable 3.3V power supply for the MCU; the reset circuit mainly resets the single-chip microcomputer when it starts up or is abnormal; the motor rotation I / O port control module is mainly used to output high and low levels, and the high and low levels are used to boost the driving level through a Darlington tube. The driving level controls the relay, and the relay controls the motor rotation; the clock circuit mainly provides a reference clock signal for the MCU to generate the clock signal required for the operation of the single-chip microcomputer; the motor current AD port acquisition module mainly acquires the working current and voltage of the motor, and turns off and turns on the motor by judging the magnitude of the working current and voltage of the motor; the motor pulse acquisition I / O port module mainly acquires the number of pulses of the motor operation, and controls the start and stop positions of the motor by increasing or decreasing the number of motor pulses; the Bluetooth serial port communication module is mainly the communication interface between the MCU and the Bluetooth; the serial screen serial port communication module is mainly the communication interface between the serial screen and the MCU; the spare serial port communication module is mainly a reserved spare serial port communication interface.

[0043] 3. Please refer to Figure 6 , the current acquisition unit:

[0044] The current acquisition unit circuit includes a voltage follower and an operational amplifier circuit; the 3.3V input voltage is converted into a 1.27V voltage through a voltage-dividing resistor, and the 1.27V voltage is input through the voltage follower. The voltage follower acts as a power isolation buffer to isolate the circuit, so that the input power is hardly affected by external interference and outputs a stable and reliable 1.27V voltage; the operational amplifier circuit amplifies the acquired current signal. The current-voltage signal flows through the negative feedback operational amplifier, and an amplified voltage signal is output, marked as Vout (the amplified voltage is: Vout = 6 * 0.02R * I + 1.27V). The output has a TVS tube clamping voltage (the clamping voltage ensures that the amplified output voltage does not exceed 3.3V, that is: Vout ≤ 3.3V); the Vout output voltage is output to the current-voltage AD sampling interface of the MCU.

[0045] 4. Please refer to Figures 7 to 8 , the motor drive unit:

[0046] The motor drive unit includes a relay control module and a motor current sampling module; the MCU outputs a drive motor control signal to a Darlington tube (the model of the Darlington tube used is: ULN2803ADWR). The Darlington tube amplifies the signal of the MCU driving the motor and gives it to the relay to control the opening and closing of the relay, and then controls the opening and closing of the motor; the sampling resistor uses a 20mΩ constantan wire resistor to sample the current, and converts the motor working current into a voltage signal through the 20mΩ constantan wire resistor, that is: V = 0.02Ω * I. The voltage signal is amplified by the current acquisition unit and given to the AD sampling port of the MCU.

[0047] 5. Please refer to Figure 9 , the motor pulse voltage conversion unit:

[0048] The motor pulse voltage conversion unit includes a two-channel voltage comparator composed of LM393. The reference voltage composed of a voltage-dividing resistor inputs the 12V voltage to pins 2 and 6 of LM393, and the pulse voltage of the motor inputs to pins 3 and 5. By comparing with the reference voltage, high and low levels are output to the base of the triode to control the conduction and cut-off of the triode, and then high level (3.3V) and low level (0V) are output to the I / O port of the MCU. The MCU starts counting through the high and low level pulses of the I / O port.

[0049] 6. Please refer to Figures 10 to 12 , the Bluetooth audio control module unit:

[0050] The Bluetooth audio control unit includes a 5V Bluetooth isolated power supply, a Bluetooth power supply, a Bluetooth audio module, and an audio output module; the main function of the 5V Bluetooth isolated power supply is to isolate the input 5V power supply, output a stable power supply that is not affected by external static electricity and external interference signals. Part of the 5V power supply is supplied to the Bluetooth output circuit, and part is supplied to the Bluetooth power supply. The Bluetooth power supply is a buck circuit composed of an LDO chip. After the 5V is input to the Bluetooth power supply, it is converted into 3.3V power supply by the LDO chip (AMS1117-3.3) to supply power to the Bluetooth audio module; on the one hand, the Bluetooth audio module communicates with the mobile phone via Bluetooth, and outputs an audio differential signal through the Bluetooth audio module. The audio differential signal is converted into an audio signal by the audio output module (the audio output module includes a headphone driver chip (PT2308)) and output to an external headphone to be converted into sound; on the other hand, the Bluetooth audio module communicates with the internal MCU via a serial port, exchanges data through the serial port communication, realizes the linkage between the mobile phone and the seat controller, and the seat controller controls the 4D massager to vibrate and massage.

[0051] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An integrated circuit for a zero-gravity chair controller, characterized in that: It includes a power supply voltage conversion unit, an MCU control unit, a current acquisition unit, a motor drive unit, a motor pulse voltage conversion unit and a Bluetooth audio control module unit; The power supply voltage conversion unit includes a power supply input module, a 5V power supply conversion module and a 3.3V power supply conversion module, wherein the power supply input module is used to output a stable 12V power supply voltage, the 5V power supply conversion module is used to convert the 12V power supply voltage into a 5V power supply voltage, and the 3.3V power supply conversion module is used to convert the 5V power supply voltage into a 3.3V power supply voltage; The MCU control unit includes a 3.3V power supply filter circuit, a reset circuit, a motor rotation I / O control module, a clock circuit, a motor current AD port acquisition module, a motor pulse acquisition I / O port module, a Bluetooth serial port communication module, a serial port screen serial port communication module and a spare serial port communication module. The 3.3V power supply filter circuit is used to provide a stable and reliable 3.3V power supply for the MCU. The reset circuit is used to reset the single-chip microcomputer when it is started or abnormal. The motor rotation I / O port control module is mainly used to output high and low levels. The clock circuit provides a reference clock signal for the MCU and is used to generate a clock signal required for the single-chip microcomputer to work. The motor current AD port acquisition module is used to collect the motor working current and voltage. The motor pulse acquisition I / O port module is used to collect the number of pulses of the motor working. The Bluetooth serial port communication module is used for the MCU and Bluetooth communication interface. The serial port screen serial port communication module is used for the serial port screen and MCU communication interface. The spare serial port communication module is used to reserve a spare serial port communication interface. The current acquisition unit includes a voltage follower and an operational amplifier circuit, wherein the voltage follower is used for power supply isolation buffer isolation circuit and reduces external interference on the input power supply, and the operational amplifier circuit is used for amplifying the collected current signal; The motor drive unit includes a relay control module and a motor current sampling module, wherein the relay control module is used to control the opening and closing of the relay and thus the opening and closing of the motor, and the motor current sampling module is used to collect voltage signals and amplify them to the AD sampling port of the MCU; The motor pulse voltage conversion unit includes a 2-way voltage comparator composed of LM393; The Bluetooth audio control module unit includes a 5V Bluetooth isolated power supply, a Bluetooth power supply, a Bluetooth audio module and an audio output module. The 5V Bluetooth isolated power supply is used to isolate the input 5V power supply and ensure output stability. The Bluetooth power supply is used to power the Bluetooth audio module. The Bluetooth audio module is used for mobile phone and Bluetooth communication and outputs audio differential signals. The audio output module is used to convert audio differential signals into audio signals and output them to external headphones and convert them into sound.

2. The integrated circuit of a zero-gravity chair controller according to claim 1, characterized in that: The power input unit outputs a stable 12V power supply voltage through capacitor filtering and TVS suppression of transient spike voltage in the input circuit, the 5V power conversion unit converts the 12V power supply voltage into a 5V power supply voltage through a DC-DC step-down conversion circuit, and the 3.3V power conversion unit converts the 5V power supply voltage into a 3.3V power supply voltage through an LDO step-down circuit.

3. The integrated circuit of a zero-gravity chair controller according to claim 1, characterized in that: The motor current AD port acquisition module acquires the motor working current and voltage, and turns the motor off and on by judging the size of the motor working current and voltage; the motor pulse acquisition I / O port module is used to acquire the number of pulses of the motor working, and controls the start and stop position of the motor by increasing or decreasing the number of motor pulses.

4. The integrated circuit of a zero-gravity chair controller according to claim 1, characterized in that: The 3.3V input voltage is converted into a 1.27V voltage through a voltage divider resistor, and the 1.27V voltage is input through the voltage follower. The voltage follower is a power isolation buffer and an isolation circuit, which reduces external interference on the input power supply and outputs a stable and reliable 1.27V voltage.

5. The integrated circuit of a zero-gravity chair controller according to claim 1, characterized in that: The working principle of the relay control module is as follows: the MCU outputs the drive motor control signal to the Darlington tube, the Darlington tube amplifies the MCU's drive motor signal and gives it to the relay, controls the relay to turn on and off, and then controls the motor to turn on and off; the working principle of the motor current sampling module is as follows: the sampling resistor uses a 20mΩ constantan wire resistor to sample the current, and the motor working current is converted into a voltage signal through the 20mΩ constantan wire resistor, and the voltage signal is amplified by the current acquisition unit and given to the AD sampling port of the MCU.

6. The integrated circuit of a zero-gravity chair controller according to claim 1, characterized in that: The working principle of the two-way voltage comparator composed of LM393 is as follows: 12V voltage is input to pins 2 and 6 of LM393 through a reference voltage composed of voltage-dividing resistors, and the pulse voltage of the motor is input to pins 3 and 5. By comparing with the reference voltage, high and low levels are output to the base of the transistor to control the on and off of the transistor, and then high and low levels are output to the I / O port of the MCU. The MCU starts counting through the high and low level pulses of the I / O port.

7. The integrated circuit of a zero-gravity chair controller according to claim 1, characterized in that: The Bluetooth power supply is a step-down circuit composed of an LDO chip. After 5V is input to the Bluetooth power supply, it is converted into a 3.3V power supply through the LDO chip to power the Bluetooth audio module.

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