A wireless seat energy and information synchronous transmission system

Abstract

The present invention proposes a wireless seat energy and information synchronous transmission system, a signal transmission method and a feedback method. The system includes an energy transmission part, a signal transmission part and a signal feedback part. The system can replace the power supply line and signal line of the traditional electric car seat, so that it can realize energy transmission and information interaction without electrical connection with the ground, which is conducive to reducing the connection lines of the cockpit system, extending the service life and eliminating safety hazards. The signal transmission method can realize the wireless synchronous transmission of signals under the premise of using the same transmitting end to ensure stable energy transmission. The signal feedback method can realize the wireless synchronous feedback of load signals without affecting the power transmission of the system, and is compatible with multiple loads and multiple signals.

Description

Technical Field

[0001] The present invention belongs to the technical field of wireless power transmission, and in particular relates to a wireless seat energy and information synchronous transmission system, a signal transmission method and a return transmission method. Background Art

[0002] With the development of electric vehicles and the advancement of technology, their intelligence and humanization levels are constantly improving. In order to enhance the user's driving experience and create a more comfortable and intelligent riding environment, the cockpit system has added many new functions, such as multi-directional seat adjustment, heating, air supply, lighting, etc., which also brings the need to power the seat equipment.

[0003] Existing commercial car seats all use wired power supply. The power supply lines are long, and during the seat adjustment process, the power supply lines are repeatedly bent and pulled as the position changes, which can easily cause damage. On the one hand, this reduces the service life, and on the other hand, it is easy to cause leakage and create safety hazards.

[0004] In order to solve the above problems, wireless power transmission devices can be used to replace the wired power supply of car seats to enhance the flexibility and safety of the cockpit system. However, the complexity of the cockpit system also brings challenges to the wireless power transmission system. First of all, there are multiple devices on the seat that need to be powered, including adjustment motors, adjustment switches, lighting, heating pads, air pumps, etc., and the load properties, operating conditions, and power supply requirements of each power supply device are different, which increases the requirements for the stability and compatibility of the wireless power supply system. Secondly, in addition to power supply, the seat electrical equipment also has information interaction with the body controller on the ground side. The body controller issues a control command, which is transmitted to the seat wirelessly to control the corresponding actuator action. In addition, the seat electrical equipment also needs to transmit its sampling signals (such as motor Hall signals, temperature sensor signals, etc.) back to the body controller on the ground side, so the car seat needs to have the function of synchronous transmission of energy and information.

[0005] How to construct a wireless power supply system framework for electric vehicle seats and realize synchronous transmission of energy and information is the key problem to be solved by the present invention. Summary of the invention

[0006] The purpose of the present invention is to solve the problem of how to construct a wireless power supply system framework for electric vehicle seats and realize the synchronous transmission of energy and information. A wireless seat energy and information synchronous transmission system, a signal transmission method and a return transmission method are proposed.

[0007] The present invention is realized by the following technical scheme. The present invention proposes a wireless seat energy and information synchronous transmission system, the system includes an energy transmission part, a signal transmission part and a signal return part;

[0008] The energy transmission part is composed of a DC power supply, a DC-DC converter, an inverter, a transmitter dual-frequency compensation topology, a coupling mechanism, a receiver compensation topology, a rectifier bridge, a seat controller and a load; the DC power supply provides energy for the entire system, which is adjusted by a DC-DC converter to construct a DC bus with adjustable voltage. The DC bus is inverted by an inverter to output a high-frequency AC voltage, which is passed into the transmitting coil after compensation by the transmitter dual-frequency compensation topology. The transmitting coil establishes a spatial magnetic field under high-frequency excitation, so that the receiving coil located therein induces a high-frequency AC voltage, which is transformed by the receiving compensation topology and the rectifier bridge and passed into the seat controller to become the energy source for the seat electrical equipment. The seat controller determines the power supply state of the load according to the working requirements of the primary and secondary sides and the upper-level instructions; in order to ensure the stability of the induced voltage at the receiving end, so that the seat controller and the electrical equipment obtain stable energy, the transmitting end adopts a constant current control module, samples the current of the transmitting coil and ensures its effective value is constant by adjusting the DC-DC converter;

[0009] The signal transmission part is specifically as follows: the body controller generates a control signal synthesized by two frequencies through modulation, drives the inverter to output a high-frequency voltage synthesized by two frequencies, generates a high-frequency current synthesized by two frequencies in the transmitting coil after dual-frequency resonance compensation at the transmitting end, wherein one frequency is used to transmit energy and the other frequency is used to transmit signals, induces a voltage in the signal receiving coil, and after conversion and demodulation by the signal receiving module, restores the transmitting signal and transmits it to the seat controller;

[0010] The signal feedback part is specifically as follows: a terminal resistor is equipped for each load, and the signal to be fed back causes the equivalent impedance change reflected from the receiving end to the transmitting end by driving the terminal resistor on and off. The signal fed back from the receiving end can be obtained by sampling the DC bus voltage, and is sent to the body controller after conditioning and demodulation to complete the signal feedback.

[0011] The present invention proposes a signal transmission method according to the transmission system, wherein the signal transmission method is as follows: the vehicle body controller at the ground end performs dual-frequency modulation on the PWM control signal according to the signal to be transmitted, wherein the frequency f 1 The component used to transfer energy remains unchanged, the frequency f 2 The components are adjusted according to the logic signal. When the logic signal is 0, the corresponding frequency f 2 When the component is 0 and the logic signal is 1, the corresponding frequency f 2The component is not 0; the dual-frequency modulated PWM signal drives the inverter, and two frequency components are generated in the output voltage; the transmitter resonant topology adopts a dual-frequency topology, which has two inherent resonance points, corresponding to the two frequencies of the PWM signal, so after compensation by the dual-frequency topology, a transmitting current with two frequency components is generated in the transmitting coil; the coupling mechanism has two coils, one large and one small, and the resonant frequency of the large coil is configured as f 1 , with frequency f 1 The transmitting current component is coupled to transmit energy, and after rectification, it is connected to the seat controller to power the seat electrical equipment; the resonant frequency of the small coil is configured as f 2 , with frequency f 2 The transmitting current is coupled to the receiving signal, and after rectification, a voltage is generated on the signal receiving terminal resistor; therefore, the logic 1 and logic 0 of the ground terminal signal correspond to the frequency f in the transmitting coil, respectively. 2 The presence or absence of the current component corresponds to the presence or absence of the output voltage on the signal receiving terminal resistor, which generates a series of voltage signals corresponding to the ground-end signals on the terminal resistor and sends them to the seat controller, realizing wireless transmission of signals from the ground end to the seat end.

[0012] The present invention proposes a signal feedback method according to the transmission system, and the signal feedback method is specifically as follows: a terminal resistor is configured for each load and connected to both ends of the load, and the terminal resistors of different loads have different resistance values; the signal that each load needs to transmit back is used as a control signal for the terminal resistor to be connected and cut out, when the signal logic is 1, the terminal resistor is connected, and when the signal logic is 0, the terminal resistor is cut out; the equivalent load change caused by this will be reflected back to the transmitting end through the coupling mechanism, so that the equivalent reflected impedance of the transmitting end changes; according to the constant current control strategy adopted by the transmitting end, the transmitting current is sampled and the effective value is calculated, and compared with the current reference value After comparison, it is sent to the PI controller for adjustment, and the adjustment result is output to the PWM generator to generate a corresponding control signal, which drives the switch tube in the DC-DC converter for adjustment; therefore, under different transmitting impedances, in order to ensure the constancy of the transmitting current, the output voltage of the DC-DC converter will change accordingly, so the high and low DC bus voltage can reflect the load signal, and the size of the DC bus voltage can reflect which load it corresponds to; therefore, by sampling the DC bus voltage, the target signal transmitted by the receiving end is restored after filtering, and the corresponding load is judged by the voltage size, and sent to the body controller after the demodulation module, the receiving end signal can be returned.

[0013] The beneficial effects of the present invention are:

[0014] 1. The wireless seat energy and information synchronous transmission system described in the present invention can replace the power supply lines and signal lines of traditional electric vehicle seats, so that it can realize energy transmission and information interaction without electrical connection with the ground, which is beneficial to reduce the connection lines of the cockpit system, extend the service life, and eliminate safety hazards.

[0015] 2. The present invention proposes a signal transmission method based on dual-frequency resonance of current modulation at the transmitting end, which can realize wireless synchronous transmission of signals by using the same transmitting end while ensuring stable energy transmission.

[0016] 3. The present invention proposes a signal feedback method based on receiving-end load modulation bus voltage detection and demodulation, which can realize wireless synchronous feedback of load signals without affecting system power transmission, and is compatible with multiple loads and multiple signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the architecture diagram of the wireless seat energy and information synchronous transmission system.

[0018] Figure 2 The figure is a signal transmission method based on dual-frequency resonance of transmitting-end current modulation.

[0019] Figure 3 The diagram is a signal feedback method based on bus voltage detection and demodulation by load modulation at the receiving end.

[0020] Figure 4 Diagram of the multi-dimensional adjustable motor energy and information synchronous transmission system for electric vehicle wireless seats. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Combination Figure 1-Figure 4 , the present invention proposes a wireless seat energy and information synchronous transmission system, the system includes an energy transmission part, a signal transmission part and a signal return part;

[0023] The energy transmission part is composed of a DC power supply, a DC-DC converter, an inverter, a transmitter dual-frequency compensation topology, a coupling mechanism, a receiver compensation topology, a rectifier bridge, a seat controller and a load; the DC power supply provides energy for the entire system, which is adjusted by a DC-DC converter to construct a DC bus with adjustable voltage. The DC bus is inverted by an inverter to output a high-frequency AC voltage, which is passed into the transmitting coil after compensation by the transmitter dual-frequency compensation topology. The transmitting coil establishes a spatial magnetic field under high-frequency excitation, so that the receiving coil located therein induces a high-frequency AC voltage, which is transformed by the receiving compensation topology and the rectifier bridge and passed into the seat controller to become the energy source for the seat electrical equipment. The seat controller determines the power supply state of the load according to the working requirements of the primary and secondary sides and the upper-level instructions; in order to ensure the stability of the induced voltage at the receiving end, so that the seat controller and the electrical equipment obtain stable energy, the transmitting end adopts a constant current control module, samples the current of the transmitting coil and ensures its effective value is constant by adjusting the DC-DC converter;

[0024] The signal transmission part is specifically as follows: the body controller generates a control signal synthesized by two frequencies through modulation, drives the inverter to output a high-frequency voltage synthesized by two frequencies, generates a high-frequency current synthesized by two frequencies in the transmitting coil after dual-frequency resonance compensation at the transmitting end, wherein one frequency is used to transmit energy and the other frequency is used to transmit signals, induces a voltage in the signal receiving coil, and after conversion and demodulation by the signal receiving module, restores the transmitting signal and transmits it to the seat controller;

[0025] The signal feedback part is specifically as follows: a terminal resistor is equipped for each load, and the signal to be transmitted back causes the equivalent impedance reflected from the receiving end to the transmitting end to change by driving the terminal resistor on and off. Since the transmitting end ensures the constant transmission current through control means, the DC bus voltage at the output end of the DC-DC converter is different under different equivalent impedances. The signal transmitted back from the receiving end can be obtained by sampling the DC bus voltage, and sent to the body controller after conditioning and demodulation to complete the signal feedback.

[0026] The present invention proposes a signal transmission method according to the transmission system, wherein the signal transmission method is as follows: the vehicle body controller at the ground end performs dual-frequency modulation on the PWM control signal according to the signal to be transmitted, wherein the frequency f 1 The component used to transfer energy remains unchanged, the frequency f 2 The components are adjusted according to the logic signal. When the logic signal is 0, the corresponding frequency f 2 When the component is 0 and the logic signal is 1, the corresponding frequency f 2The component is not 0; the dual-frequency modulated PWM signal drives the inverter, and two frequency components are generated in the output voltage; the transmitter resonant topology adopts a dual-frequency topology, which has two inherent resonance points, corresponding to the two frequencies of the PWM signal, so after compensation by the dual-frequency topology, a transmitting current with two frequency components is generated in the transmitting coil; the coupling mechanism has two coils, one large and one small, and the resonant frequency of the large coil is configured as f 1 , with frequency f 1 The transmitting current component is coupled to transmit energy, and after rectification, it is connected to the seat controller to power the seat electrical equipment; the resonant frequency of the small coil is configured as f 2 , with frequency f 2 The transmitting current is coupled to the receiving signal, and after rectification, a voltage is generated on the signal receiving terminal resistor; therefore, the logic 1 and logic 0 of the ground terminal signal correspond to the frequency f in the transmitting coil, respectively. 2 The presence or absence of the current component corresponds to the presence or absence of the output voltage on the signal receiving terminal resistor, which generates a series of voltage signals corresponding to the ground-end signals on the terminal resistor and sends them to the seat controller, realizing wireless transmission of signals from the ground end to the seat end.

[0027] The present invention proposes a signal feedback method according to the transmission system, and the signal feedback method is specifically as follows: a terminal resistor is configured for each load and connected to both ends of the load, and the terminal resistors of different loads have different resistance values; the signal that each load needs to transmit back is used as a control signal for the terminal resistor to be connected and cut out, when the signal logic is 1, the terminal resistor is connected, and when the signal logic is 0, the terminal resistor is cut out; the equivalent load change caused by this will be reflected back to the transmitting end through the coupling mechanism, so that the equivalent reflected impedance of the transmitting end changes; according to the constant current control strategy adopted by the transmitting end, the transmitting current is sampled and the effective value is calculated, and compared with the current reference value After comparison, it is sent to the PI controller for adjustment, and the adjustment result is output to the PWM generator to generate a corresponding control signal, which drives the switch tube in the DC-DC converter for adjustment; therefore, under different transmitting impedances, in order to ensure the constancy of the transmitting current, the output voltage of the DC-DC converter will change accordingly, so the high and low DC bus voltage can reflect the load signal, and the size of the DC bus voltage can reflect which load it corresponds to; therefore, by sampling the DC bus voltage, the target signal transmitted by the receiving end is restored after filtering, and the corresponding load is judged by the voltage size, and sent to the body controller after the demodulation module, the receiving end signal can be returned.

[0028] The present invention can be used for wireless power supply of seats in various scenarios such as electric vehicles, subways, trains, etc., one implementation method of which is as follows: Figure 4As shown in the figure, wireless power supply and information exchange of the multi-dimensional adjustable motor of the electric vehicle seat are realized. The power supply load includes not only the motor, but also various loads such as lighting, heating pad, air pump, etc., and the actuator includes not only the adjustment switch, but also various types such as relays and contactors.

[0029] The wireless seat energy and information synchronous transmission system, signal transmission method and feedback method proposed in the present invention are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for general technical personnel in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A wireless seat energy and information synchronous transmission system, characterized in that: The system includes a receiving end and a transmitting end; the transmitting end includes a DC power supply, a DC-DC converter, an inverter, a transmitting end dual-frequency compensation topology, a constant current control module, a demodulation module, a dual-frequency modulation PWM generation module and a body controller; the receiving end includes a receiving end compensation topology, a rectifier bridge, a seat controller, a load and a signal receiving module; the DC power supply, the DC-DC converter, the inverter, the transmitting end dual-frequency compensation topology, the receiving end compensation topology, the rectifier bridge, the seat controller and the load are connected in sequence, the constant current control module is connected to the DC-DC converter and the transmitting end dual-frequency compensation topology, the demodulation module is connected between the DC-DC converter and the inverter, the dual-frequency modulation PWM generation module is connected between the inverter and the body controller, and the demodulation module is also connected to the body controller; To realize energy transmission, signal transmission and signal return of wireless seats; The energy transmission includes: a DC power supply provides energy for the entire system, which is adjusted through a DC-DC converter to construct a DC bus with adjustable voltage. The DC bus is inverted by an inverter to output a high-frequency AC voltage, which is passed into a transmitting coil after being compensated by a dual-frequency compensation topology at the transmitting end. The transmitting coil establishes a spatial magnetic field under high-frequency excitation, so that the receiving coil located therein induces a high-frequency AC voltage, which is transformed by the receiving end compensation topology and a rectifier bridge and passed into a seat controller to become an energy source for the seat electrical equipment. The seat controller determines the power supply state of the load according to the working requirements of the primary and secondary sides and the upper-level instructions; in order to ensure the stability of the induced voltage at the receiving end, so that the seat controller and the electrical equipment obtain stable energy, the constant current control module samples the current of the transmitting coil and ensures its effective value is constant by adjusting the DC-DC converter; The signal transmission includes: the body controller generates a control signal synthesized by two frequencies through modulation, drives the inverter to output a high-frequency voltage synthesized by two frequencies, generates a high-frequency current synthesized by two frequencies in the transmitting coil after dual-frequency resonance compensation at the transmitting end, wherein one frequency is used to transmit energy and the other frequency is used to transmit signals, induces voltage in the receiving coil, and after transformation and demodulation by the signal receiving module, the transmitting signal is restored and transmitted to the seat controller; the signal transmission further includes: the body controller at the ground end performs dual-frequency modulation on the PWM control signal according to the signal to be transmitted using a dual-frequency modulation PWM generation module, wherein the component of frequency f1 remains unchanged for energy transmission, and the component of frequency f2 is adjusted according to the logic signal, the logic signal is generated according to the ground end signal, the ground end signal includes logic 1 and logic 0, when the logic signal is 0, the corresponding component of frequency f2 is 0, when the logic signal is 1, the corresponding component of frequency f2 is not 0; the PWM control signal is dual-frequency modulated The signal obtained after modulation drives the inverter, and two frequency components are generated in the output voltage; the dual-frequency compensation topology of the transmitting end adopts a dual-frequency topology, which has two inherent resonance points, corresponding to the two frequencies of the signal obtained after dual-frequency modulation. Therefore, after compensation by the dual-frequency topology, a transmitting current with two frequency components is generated in the transmitting coil; the receiving coil has two coils, one large and one small. The resonant frequency of the large coil is configured as f1, which is coupled with the transmitting current component of the frequency f1 to transmit energy, and is connected to the seat controller after rectification to power the seat electrical equipment; the resonant frequency of the small coil is configured as f2, which is coupled with the transmitting current of the frequency f2 to receive the signal, and a voltage is generated on the terminal resistor after rectification; therefore, the logic 1 and logic 0 of the ground-end signal correspond to the presence or absence of the current component of the frequency f2 in the transmitting coil, and thus to the presence or absence of the output voltage on the terminal resistor, so that a series of voltage signals corresponding to the ground-end signal are generated on the terminal resistor and sent to the seat controller to realize the wireless transmission of the signal from the ground end to the seat end; The signal feedback includes: equipping each load with a terminal resistor, the signal to be fed back causes the equivalent impedance change reflected from the receiving end to the transmitting end by driving the terminal resistor to be turned on and off, and the signal fed back from the receiving end can be obtained by sampling the DC bus voltage, and sent to the body controller after conditioning and demodulation to complete the signal feedback; the signal feedback further includes: configuring a terminal resistor for each load and connecting it to both ends of the load, and the terminal resistors of different loads have different resistance values; the signal that each load needs to feed back is used as a control signal for the terminal resistor to be connected in and out, when the signal logic is 1, the terminal resistor is connected, and when the signal logic is 0, the terminal resistor is cut out; the equivalent load change caused by this will be reflected back to the transmitting end through the receiving coil, The equivalent reflected impedance of the transmitting end changes; the constant current control module uses the transmitting current and calculates the effective value, compares it with the current reference value, and then sends it to the PI controller for adjustment. The adjustment result is output to the PWM generator to generate a corresponding control signal, which drives the switch tube in the DC-DC converter for adjustment; therefore, under different transmitting impedances, in order to ensure the constancy of the transmitting current, the output voltage of the DC-DC converter will change accordingly, so the high and low DC bus voltage can reflect the load signal, and the size of the DC bus voltage can reflect the corresponding load; therefore, by sampling the DC bus voltage, the target signal transmitted by the receiving end is restored after filtering, and the corresponding load is judged by the voltage size, and sent to the body controller after the demodulation module.

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