Rectification method for self-adaptive wireless charging receiving end of electric bicycle

Abstract

The invention relates to the technical field of radio transmission, in particular to an adaptive wireless charging receiving end rectification method for an electric bicycle, which comprises the following steps of: when an electric bicycle wireless charging receiver exists at a transmitting end, establishing communication connection between the transmitting end and the electric bicycle wireless charging receiver; the transmitting end performs verification and matching, when the wireless charging receiving end is confirmed to be safe charging equipment, the wireless charging receiver of the electric bicycle is started and charges the electric bicycle, and meanwhile, the control circuit detects operation parameters of the rectification main circuit in real time, and if abnormal operation of the rectification main circuit is not found, the wireless charging receiver of the electric bicycle is started. The control circuit judges charging voltage and current levels required by the electric bicycle, the rectification main circuit converts received alternating current into corresponding direct current according to adjustment of the control circuit and transmits the direct current to the battery of the electric bicycle, and the mode can be compatible with battery voltage levels of different types of electric bicycles. And autonomous identification and adaptive charging are realized.

Description

Technical Field

[0001] The invention belongs to the technical field of radio transmission, and in particular relates to a rectification method for an electric bicycle adaptive wireless charging receiving end. Background Art

[0002] As a non-contact charging method, wireless charging technology has no external exposed contacts and is safer and more durable. In the application of electric bicycles, wireless charging helps reduce the risk of spontaneous combustion caused by the charger during the charging process of electric bicycles, and can improve the safety and reliability of the charger when exposed to outdoor weather conditions such as rain and snow. Therefore, when an electric bicycle is wirelessly charged, a rectifier circuit must be equipped at the receiving end to ensure the safety of the electric bicycle charging.

[0003] After searching, the Chinese patent document application number is 201711145186.X, which discloses a synchronous rectification circuit of a wireless charging receiving end, which is used to realize the rectification function of a wireless charging receiver, wherein the synchronous rectification circuit is connected between the resonant circuit of the wireless charging receiver and the load, and includes a MOS tube rectification circuit and a synchronous rectification control circuit. The synchronous rectification control circuit controls the driving voltage input to each MOS tube in the MOS tube rectification circuit to realize the control of the working timing of each MOS tube in the MOS tube rectification circuit, so that the synchronous rectification circuit has a rectification effect consistent with the preset effect. The synchronous rectification circuit of the wireless charging receiving end of the invention has a higher rectification efficiency than the diode rectification circuit in the prior art, and can significantly improve the heating problem caused by the diode rectification loss. It is simple and convenient, and does not require the introduction of additional software control. It can be used as an independent module to replace the diode rectification module; However, due to the various voltage levels of electric bicycles currently, the existing wireless charging receiving end rectifier circuit is usually designed for a specific input voltage range to ensure that it can work efficiently and stably within this range. Electric bicycles with different voltage levels require different rectifier circuit configurations to adapt to their specific operating voltage and current requirements, which cannot meet the needs of different electric bicycle users. Therefore, we need to propose an electric bicycle adaptive wireless charging receiving end rectification method to solve the above-mentioned problems, so that it can have multi-voltage level compatibility and adaptive charging functions, which is conducive to the productization and promotion and application of electric bicycle wireless charging technology. Summary of the invention

[0004] In view of the above problems, the present invention provides an adaptive wireless charging receiving end rectification method for an electric bicycle, comprising the following steps: S1. When the wireless charging receiver of the electric bicycle approaches the transmitter, the transmitter detects the presence of the wireless charging receiver, and the transmitter establishes a communication connection with the wireless charging receiver of the electric bicycle and performs identity authentication; The wireless charging receiver for electric bicycles includes a wireless charging receiving end, and the wireless charging receiving end includes a main rectifier circuit and a control circuit. The main rectifier circuit is used to convert the received high-frequency alternating current into a stable direct current suitable for charging the electric bicycle and charge the electric bicycle. The control circuit is used to monitor the operating parameters of the main rectifier circuit and realize adaptive charging control compatible with multiple voltage levels. S2. After the identity authentication is successful, the wireless charging receiving end sends a data packet to the transmitting end. After receiving the data packet, the transmitting end verifies and matches it. When it is determined that the wireless charging receiving end is a safe charging device, the wireless charging receiver of the electric bicycle is started and the electric bicycle is charged. At the same time, the control circuit detects the operating parameters of the rectifier main circuit in real time, and the operating parameters include input voltage and current. S21. If the main rectifier circuit is found to be operating abnormally, including overvoltage, overcurrent, and overheating, the control circuit shall immediately take measures to protect the circuit and equipment safety; S22, if no abnormal operation of the main rectifier circuit is found, the control circuit determines the charging voltage and current level required by the electric bicycle according to the received operating parameters, and the main rectifier circuit converts the received alternating current into corresponding direct current according to the adjustment of the control circuit, and transmits it to the battery of the electric bicycle; S3. When the battery of the electric bicycle is fully charged or reaches the preset charging time, the control circuit sends an instruction to stop charging, the switch device in the rectifier main circuit is turned off, the connection between the transmitter and the electric bicycle wireless charging receiver is cut off, and the charging ends.

[0005] Furthermore, the main rectification circuit includes a high-frequency rectification circuit and a DC buck-boost circuit. The high-frequency rectification circuit is used to convert the high-frequency AC current output by the wireless charging receiving end coil of the electric bicycle into a DC current; the DC buck-boost circuit is used to convert the DC current that fluctuates within a certain range and is output by the high-frequency rectification circuit into a stable DC current, and control the output of the stable DC current through a switching device.

[0006] Furthermore, the DC boost / boost circuit is mainly composed of a switch tube S5, a switch tube S6, a diode D6, an inductor L1, a capacitor C1 and a capacitor C2. The capacitor C1, the inductor L1 and the capacitor C2 are connected in parallel, and the switch tube S5 is connected between the capacitor C1 and the inductor L1, the switch tube S6 is connected between the inductor L1 and the capacitor C2, the diode D6 is connected to the connecting end of the capacitor C2 and the switch tube S6, the diode D6 and the other end of the capacitor C2 are used for DC output, and the ends of the capacitor C1 are used for DC input.

[0007] Furthermore, the control circuit includes a sensing circuit, a control chip, a drive circuit and an auxiliary power supply circuit. The sensing circuit includes a voltage sensing circuit and a current sensing circuit. The voltage of the main rectifier circuit is monitored in real time by the voltage sensing circuit, and the current of the main rectifier circuit is monitored in real time by the current sensing circuit. The control chip is used to output the control signal of the switching device in the DC buck-boost circuit according to the received sensor circuit output signal and a preset program to meet the charging current requirements of different electric bicycles. The drive circuit is used to convert the control signal output by the control chip into a corresponding voltage signal that actually drives the switching device in the DC buck-boost circuit to turn on or off. The auxiliary power supply circuit is used to provide the required power for the sensing circuit, the control chip and the drive circuit.

[0008] Furthermore, the process of the control chip outputting a control signal for controlling the on / off of a switch device in a DC buck-boost circuit is as follows: A1. Preset the program of the control chip. The preset program includes judging the current voltage level of the battery of the electric bicycle, precharging the capacitor in the initial stage of charging, realizing the control closed loop of the DC buck-boost circuit according to the target voltage and current output, and actively closing the control signal output in the event of a fault; A2, judging the current charging voltage level of the electric bicycle battery according to the voltage and current signals of the rectifier main circuit collected by the sensor circuit, and determining the target charging voltage V2; A3. Calculate the error value D based on the target rate voltage and the actual collected voltage, and then calculate the control signal U based on the error value D out , the calculation formula is as follows: ; Among them, V1 is the actual voltage value, is the voltage error at time k, is the proportionality coefficient, is the integration coefficient, is the calculus coefficient, T is the time from moment k-1 to moment k; A4, outputting the calculated control signal to the driving circuit, which converts the received control signal into an actual voltage signal to drive the switch device in the DC buck-boost circuit to turn on or off, and transmits the actual voltage signal to the DC buck-boost circuit; A5, the DC step-up and step-down circuit receives the actual voltage signal to control the switch device to turn on and off, so as to provide a stable DC current for charging the electric bicycle; A6. During the charging process, the actual output voltage and current are monitored in real time through the sensor circuit, and the monitored actual output voltage and current are compared with the target charging voltage and current. The control signal is adjusted according to the comparison result to ensure that the output voltage and current always meet the preset requirements.

[0010] Furthermore, the driving circuit is mainly composed of an isolation driving chip U1, a driving resistor R6 and a gate protection resistor R7 connected between the gate and source of the switch tubes S5 and S6. One end of the driving resistor R6 is connected to the connecting end of the resistor R7 and the gate of the switch tube S6 and to the connecting end of the resistor R7 and the gate of the switch tube S5. The other end of the driving resistor R6 is connected to the isolation driving chip U1.

[0011] Furthermore, when the DC buck-boost circuit is boosting, when the switch tube S5 is turned on and the switch tube S6 is turned off, the input voltage is added to the inductor L1 through the switch tube S5, and at this time the inductor L1 starts to store energy. Due to the filtering effect of the capacitor C1, the input voltage is relatively stable; when the switch tube S5 is turned off and the switch tube S6 is turned on, the current in the inductor L1 will not immediately become 0, but will continue to flow due to the current holding characteristic of the inductor L1. At this time, the inductor charges the capacitor C2 through the diode D6 and provides energy to the load at the same time. Since the polarity of the electromotive force at both ends of the inductor L1 is the same as the polarity of the input power supply when the inductor L1 releases energy, the voltage on the capacitor C2 will be higher than the input voltage, thereby achieving boosting; When reducing the voltage, by adjusting the duty cycle of the switch tubes S5 and S6, when the duty cycle is the smallest, the inductor L1 is in a discharge state for a longer period of time, causing the output voltage to be lower than the input voltage, thereby achieving voltage reduction.

[0012] Furthermore, in step S1, the communication between the transmitter and the electric bicycle wireless charging receiver follows the QI standard communication protocol. When performing identity authentication, the transmitter will first send an analog ping signal to detect whether there is an electric bicycle wireless charging receiver placed in the charging area. If the electric bicycle wireless charging receiver is detected, the transmitter sends a digital ping signal to allow the wireless charging receiver time to reply with a signal strength package. If the signal strength package replied by the wireless charging receiver is valid, it indicates that the communication link between the two is successfully established, and then enters S2.

[0013] Furthermore, in step S2, the data packet includes the identity information, configuration information, required charging parameters and signal strength packet of the receiving end.

[0014] Furthermore, the process of verification and matching performed by the transmitting end after receiving the data packet is as follows: B1. After receiving the data packet, the transmitter compares the change of its own output energy with the change of the electrical parameters sent back by the wireless charging receiver. If the changes are consistent, it means that the wireless charging receiver is a compatible and safe charging device and proceeds to B2. If the changes are inconsistent, it means that the wireless charging receiver is not a compatible charging device and the wireless charging receiver of the electric bicycle does not work. B2. The transmitter adjusts its output power according to the configuration information and signal strength packet sent by the wireless charging receiver to match the charging requirements of the wireless charging receiver.

[0015] The beneficial effects of the present invention are: When there is an electric bicycle wireless charging receiver at the transmitting end of the present invention, a communication connection is established between the transmitting end and the electric bicycle wireless charging receiver, and identity authentication is performed. After the identity authentication is successful, the transmitting end performs verification and matching, and when it is confirmed that the wireless charging receiving end is a safe charging device, the electric bicycle wireless charging receiver is started and the electric vehicle is charged. At the same time, the control circuit detects the operating parameters of the rectifier main circuit in real time. If no abnormal operation of the rectifier main circuit is found, the control circuit determines the charging voltage and current level required for the electric bicycle. The rectifier main circuit converts the received alternating current into corresponding direct current according to the adjustment of the control circuit, and transmits it to the electric bicycle battery. In this way, it is compatible with the battery voltage levels of different types of electric bicycles, and realizes autonomous identification and adaptive charging, which helps to improve the safety and convenience of electric bicycle charging.

[0016] The wireless charging receiving end of the present invention is mainly composed of a rectifier main circuit and a control circuit. The rectifier main circuit is used to convert the received high-frequency alternating current into a stable direct current suitable for charging an electric bicycle, and the electric bicycle is charged. The control circuit is used to monitor the operating parameters of the rectifier main circuit and realize adaptive charging control compatible with multiple voltage levels, thereby meeting the charging needs of different electric bicycles.

[0017] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram of a process according to an embodiment of the present invention is shown; Figure 2 A block diagram of a main rectifier circuit system according to an embodiment of the present invention is shown; Figure 3 A circuit diagram of a high frequency rectifier circuit according to Embodiment 1 of the present invention is shown; Figure 4 A circuit diagram of a DC buck-boost circuit according to an embodiment of the present invention is shown; Figure 5 A schematic diagram showing the principle of a control circuit according to an embodiment of the present invention is shown; Figure 6 A circuit diagram of a voltage sensing circuit according to an embodiment of the present invention is shown; Figure 7 A circuit diagram of a current sensing circuit according to an embodiment of the present invention is shown; Figure 8 A circuit diagram of a driving circuit according to an embodiment of the present invention is shown; Fig. 9 A circuit diagram of a high-frequency rectifier circuit according to Embodiment 2 of the present invention is shown. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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. Example

[0021] The embodiment of the present invention provides a rectification method for an electric bicycle adaptive wireless charging receiving end. Figure 1-8 As shown, the following steps are included: S1. When the wireless charging receiver of the electric bicycle approaches the transmitter, the transmitter detects the presence of the wireless charging receiver, and the transmitter establishes a communication connection with the wireless charging receiver of the electric bicycle and performs identity authentication; The communication between the transmitter and the electric bicycle wireless charging receiver follows the QI standard communication protocol. When performing identity authentication, the transmitter will first send an analog ping signal to detect whether there is an electric bicycle wireless charging receiver placed in the charging area. If the electric bicycle wireless charging receiver is detected, the transmitter sends a digital ping signal to allow the wireless charging receiver time to reply with a signal strength package. If the signal strength package replied by the wireless charging receiver is valid, it indicates that the communication link between the two is successfully established, and then enters S2.

[0022] Among them, the electric bicycle wireless charging receiver includes a wireless charging receiving end, and the wireless charging receiving end includes a rectifier main circuit and a control circuit. The rectifier main circuit is used to convert the received high-frequency alternating current into a stable direct current suitable for charging the electric bicycle and charge the electric bicycle. The control circuit is used to monitor the operating parameters of the rectifier main circuit and realize adaptive charging control compatible with multiple voltage levels.

[0023] The main rectifier circuit includes a high-frequency rectifier circuit and a DC buck-boost circuit. The high-frequency rectifier circuit is used to convert the high-frequency AC current output by the coil of the wireless charging receiving end of the electric bicycle into a DC current; the DC buck-boost circuit is used to convert the DC current that fluctuates within a certain range output by the high-frequency rectifier circuit into a stable DC current, and control the output of the stable DC current through a switching device; Among them, Figure 3 As shown, the high-frequency rectifier circuit is a full-bridge rectifier circuit mainly composed of a diode D1, a diode D2, a diode D3 and a diode D4. An AC input interface is provided between the diode D1 and the diode D3, and a DC output interface is provided between the diode D2 and the diode D4. In the positive half cycle of the AC power, the diode D1 and the diode D4 are in the on state, while the diode D2 and the diode D3 are in the off state. At this time, the current flows from the positive electrode of the AC power supply through the diode D1 into the circuit, passes through the load, and flows back to the negative electrode of the AC power supply through the diode D4. In the negative half cycle of the AC power supply, the current flows from the positive electrode of the AC power supply to the circuit through the diode D1, passes through the load, and flows back to the negative electrode of the AC power supply through the diode D4. In a half cycle, diode D2 and diode D3 are in the on state, while diode D1 and diode D4 are in the off state. At this time, the current flows into the circuit from the negative electrode of the AC power supply through diode D3, and after passing through the load, flows back to the positive electrode of the AC power supply through diode D2. After the above-mentioned rectification process, the AC power is converted into DC power with unchanged direction, and is output through the DC output interface between diode D2 and diode D4. The alternating conduction of diode D1, diode D2, diode D3 and diode D4 realizes the rectification of the AC power and converts it into DC power with unchanged direction.

[0024] like Figure 4As shown, the DC step-up and step-down circuit is mainly composed of a switch tube S5, a switch tube S6, a diode D6, an inductor L1, a capacitor C1 and a capacitor C2. The capacitor C1, the inductor L1 and the capacitor C2 are connected in parallel, and the switch tube S5 is connected between the capacitor C1 and the inductor L1, the switch tube S6 is connected between the inductor L1 and the capacitor C2, the diode D6 is connected to the connection end of the capacitor C2 and the switch tube S6, the diode D6 and the other end of the capacitor C2 are used for DC output, the two ends of the capacitor C1 are used for DC input, and the diode D6 is used to prevent current backflow when the wireless charging receiving end charger of the electric bicycle is connected to the electric bicycle; During voltage boost, when the switch tube S5 is turned on and the switch tube S6 is turned off, the input voltage is added to the inductor L1 through the switch tube S5. At this time, the inductor L1 starts to store energy. Due to the filtering effect of the capacitor C1, the input voltage is relatively stable. When the switch tube S5 is turned off and the switch tube S6 is turned on, the current in the inductor L1 will not immediately become 0, but will continue to flow due to the current holding characteristic of the inductor L1. At this time, the inductor charges the capacitor C2 through the diode D6 and provides energy to the load at the same time. Since the polarity of the electromotive force at both ends of the inductor L1 is the same as the polarity of the input power supply when the inductor L1 releases energy, the voltage on the capacitor C2 will be higher than the input voltage, thus achieving voltage boost. When reducing the voltage, by adjusting the duty cycle of the switch tubes S5 and S6, when the duty cycle is the smallest, the inductor L1 is in a discharge state for a longer period of time, causing the output voltage to be lower than the input voltage, thereby achieving voltage reduction.

[0025] like Figure 5 As shown, the control circuit includes a sensing circuit, a control chip, a drive circuit and an auxiliary power supply circuit. The sensing circuit includes a voltage sensing circuit and a current sensing circuit. The voltage of the rectifier main circuit is monitored in real time by the voltage sensing circuit, and the current of the rectifier main circuit is monitored in real time by the current sensing circuit. The control chip is used to output the control signal of the switch device in the DC buck-boost circuit according to the received sensor circuit output signal and the preset program to meet the charging current requirements of different electric bicycles. The drive circuit is used to convert the control signal output by the control chip into a corresponding voltage signal that actually drives the switch device in the DC buck-boost circuit to turn on or off. The auxiliary power supply circuit is used to provide the required power for the sensing circuit, the control chip and the drive circuit.

[0026] like Figure 6As shown, the voltage sensing circuit is mainly composed of a sampling resistor R1, a sampling resistor R2 and an amplifier A1. The sampling circuit R1 and the sampling resistor R2 are connected in parallel to the positive terminal of the amplifier A1. The output end of the amplifier A1 is connected to the control chip. The sampling resistor R1 and the sampling resistor R2 are both connected to the rectifier main circuit. The voltage value of the rectifier main circuit is collected by the sampling resistor R1 and the sampling resistor R2, and then amplified by the amplifier A1 and transmitted to the control chip.

[0027] like Figure 7 As shown, the current sensing circuit is mainly composed of a sampling resistor R3, a feedback resistor R4, an input resistor R5 and an amplifier A2. The input resistor R5 is connected to the negative terminal of the amplifier A2, the sampling resistor R3 is connected to the input end of the input resistor R5, and the feedback resistor R4 is connected between the negative terminal and the output end of the amplifier A2. The output of the amplifier A2 is stabilized by the feedback resistor R4, the nonlinear distortion is reduced, and the anti-interference ability of the circuit is improved. The current value of the rectifier main circuit is collected in real time by the sampling resistor R3, and the influence of the input current on the amplifier A2 is reduced by the input resistor R5, thereby improving the sensitivity of the circuit.

[0028] The process of the control chip outputting a control signal for controlling the on / off of a switch device in a DC buck-boost circuit is as follows: A1. Preset the program of the control chip. The preset program includes judging the current voltage level of the battery of the electric bicycle, precharging the capacitor in the initial stage of charging, realizing the control closed loop of the DC buck-boost circuit according to the target voltage and current output, and actively closing the control signal output in the event of a fault; A2, judging the current charging voltage level of the electric bicycle battery according to the voltage and current signals of the rectifier main circuit collected by the sensor circuit, and determining the target charging voltage V2; A3. Calculate the error value D based on the target rate voltage and the actual collected voltage, and then calculate the control signal U based on the error value D out , the calculation formula is as follows: D = V2 - V1;

[0029] Among them, V1 is the actual voltage value, is the voltage error at time k, is the proportionality coefficient, is the integration coefficient, is the calculus coefficient, T is the time from moment k-1 to moment k; A4, outputting the calculated control signal to the driving circuit, which converts the received control signal into an actual voltage signal to drive the switch device in the DC buck-boost circuit to turn on or off, and transmits the actual voltage signal to the DC buck-boost circuit; A5, the DC step-up and step-down circuit receives the actual voltage signal to control the switch device to turn on and off, so as to provide a stable DC current for charging the electric bicycle; A6. During the charging process, the actual output voltage and current are monitored in real time through the sensor circuit, the monitored actual output voltage and current are compared with the target charging voltage and current, and the control signal is adjusted according to the comparison result to ensure that the output voltage and current always meet the preset requirements; like Figure 8 As shown, the driving circuit is mainly composed of an isolation driving chip U1, a driving resistor R6 and a gate protection resistor R7 connected between the gate and source of the switch tube S5 and the switch tube S6. One end of the driving resistor R6 is connected to the connection end of the resistor R7 and the gate of the switch tube S6 and the connection end of the resistor R7 and the gate of the switch tube S5. The other end of the driving resistor R6 is connected to the isolation driving chip U1, and the control signal is received through the isolation driving chip U1, and then the switch tube S5 and the switch tube S6 are driven to be turned on and off through the driving resistor R6, so as to adjust the output size of the output voltage by adjusting the duty cycle of the switch tube S5 and the switch tube S6, so that it can meet the charging requirements of different electric bicycles.

[0030] The auxiliary power supply circuit is mainly composed of an input filter circuit, a flyback converter, an output filter circuit and a feedback control circuit. The input filter circuit is used to filter out noise and interference in the input power supply to ensure the stability of the power supply; the flyback converter is used to convert the input power supply into the required DC power supply; the output filter circuit is used to smooth and stabilize the output DC power supply to ensure that each circuit can obtain a stable power supply; the feedback control circuit is used to monitor the output voltage and current, and adjust the working state of the flyback converter as needed to maintain the stability of the output voltage and current.

[0031] S2. After the identity authentication is successful, the wireless charging receiving end sends a data packet to the transmitting end. After receiving the data packet, the transmitting end verifies and matches it. When it is determined that the wireless charging receiving end is a safe charging device, the wireless charging receiver of the electric bicycle is started and the electric bicycle is charged. At the same time, the control circuit detects the operating parameters of the rectifier main circuit in real time, and the operating parameters include input voltage and current. The data packet includes the identity information, configuration information, required charging parameters and signal strength packet of the receiving end; The process of verification and matching after the transmitting end receives the data packet is as follows: B1. After receiving the data packet, the transmitter compares the change of its own output energy with the change of the electrical parameters sent back by the wireless charging receiver. If the changes are consistent, it means that the wireless charging receiver is a compatible and safe charging device and proceeds to B2. If the changes are inconsistent, it means that the wireless charging receiver is not a compatible charging device and the wireless charging receiver of the electric bicycle does not work. B2. The transmitter adjusts its output power according to the configuration information and signal strength packet sent by the wireless charging receiver to match the charging requirements of the wireless charging receiver; S21. If the main rectifier circuit is found to be operating abnormally, including overvoltage, overcurrent, and overheating, the control circuit shall immediately take measures to protect the circuit and equipment safety; for example, turn off the switch device, cut off the power supply, or start the cooling system, etc.; S22, if no abnormal operation of the main rectifier circuit is found, the control circuit determines the charging voltage and current level required by the electric bicycle according to the received operating parameters, and the main rectifier circuit converts the received alternating current into corresponding direct current according to the adjustment of the control circuit, and transmits it to the battery of the electric bicycle; S3. When the battery of the electric bicycle is fully charged or reaches the preset charging time, the control circuit sends an instruction to stop charging, the switch device in the rectifier main circuit is turned off, the connection between the transmitter and the electric bicycle wireless charging receiver is cut off, and the charging ends.

[0032] The transmitter detects whether there is an electric bicycle wireless charging receiver. When there is an electric bicycle wireless charging receiver, a communication connection is established between the transmitter and the electric bicycle wireless charging receiver, and identity authentication is performed. After the identity authentication is successful, the transmitter performs verification and matching. When it is confirmed that the wireless charging receiver is a safe charging device, the electric bicycle wireless charging receiver is started and the electric vehicle is charged. At the same time, the control circuit detects the operating parameters of the rectifier main circuit in real time. If no abnormal operation of the rectifier main circuit is found, the control circuit determines the charging voltage and current level required for the electric bicycle according to the received operating parameters. The rectifier main circuit converts the received alternating current into corresponding direct current according to the adjustment of the control circuit, and transmits it to the electric bicycle battery. In this way, it can be compatible with the battery voltage levels of different types of electric bicycles, and realize autonomous identification and adaptive charging, which helps to improve the safety and convenience of electric bicycle charging. Example

[0033] The similarities will not be repeated here. The difference from Example 1 is that Fig. 9As shown, the high-frequency rectifier circuit is a full-bridge rectifier circuit mainly composed of a switch tube S1, a switch tube S2, a switch tube S3 and a switch tube S4. An AC input interface is provided between the switch tube S1 and the switch tube S2, and a DC output interface is provided between the switch tube S3 and the switch tube S4. The AC enters the high-frequency rectifier circuit through the AC input interface between the switch tubes S1 and S2. In the positive half cycle of the AC, the switch tubes S1 and S4 are controlled to be in the on state, while the switch tubes S2 and S3 are controlled to be in the off state. At this time, the current flows into the circuit from the positive electrode of the AC power supply through the switch tube S1. After passing through the load, the current flows back to the negative electrode of the AC power supply through the switch tube S4. In the negative half cycle of the AC power supply, the switch tubes S2 and S3 are controlled to be in the on state, while the switch tubes S1 and S4 are controlled to be in the off state. At this time, the current flows into the circuit from the negative electrode of the AC power supply through the switch tube S3. After passing through the load, the current flows back to the positive electrode of the AC power supply through the switch tube S2. After the above rectification process, the AC power is converted into DC power with unchanged direction and output through the DC output interface between the switch tubes S3 and S4. The device loss is reduced by synchronous rectification, and the rectification efficiency of the high-frequency rectification circuit is improved.

[0034] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A rectification method for an electric bicycle adaptive wireless charging receiving end, characterized in that: The steps include: S1. When the wireless charging receiver of the electric bicycle approaches the transmitter, the transmitter detects the presence of the wireless charging receiver, and the transmitter establishes a communication connection with the wireless charging receiver of the electric bicycle and performs identity authentication; The wireless charging receiver for electric bicycles includes a wireless charging receiving end, and the wireless charging receiving end includes a main rectifier circuit and a control circuit. The main rectifier circuit is used to convert the received high-frequency alternating current into a stable direct current suitable for charging the electric bicycle and charge the electric bicycle. The control circuit is used to monitor the operating parameters of the main rectifier circuit and realize adaptive charging control compatible with multiple voltage levels. S2. After the identity authentication is successful, the wireless charging receiving end sends a data packet to the transmitting end. After receiving the data packet, the transmitting end verifies and matches it. When it is determined that the wireless charging receiving end is a safe charging device, the wireless charging receiver of the electric bicycle is started and the electric bicycle is charged. At the same time, the control circuit detects the operating parameters of the rectifier main circuit in real time, and the operating parameters include input voltage and current. S21. If the main rectifier circuit is found to be operating abnormally, including overvoltage, overcurrent, and overheating, the control circuit shall immediately take measures to protect the circuit and equipment safety; S22, if no abnormal operation of the main rectifier circuit is found, the control circuit determines the charging voltage and current level required by the electric bicycle according to the received operating parameters, and the main rectifier circuit converts the received alternating current into corresponding direct current according to the adjustment of the control circuit, and transmits it to the battery of the electric bicycle; S3. When the battery of the electric bicycle is fully charged or reaches the preset charging time, the control circuit sends an instruction to stop charging, the switch device in the main rectifier circuit is turned off, the connection between the transmitter and the electric bicycle wireless charging receiver is cut off, and the charging ends.

2. The method for rectifying an electric bicycle adaptive wireless charging receiving end according to claim 1, characterized in that: The main rectification circuit includes a high-frequency rectification circuit and a DC buck-boost circuit. The high-frequency rectification circuit is used to convert the high-frequency alternating current output by the coil of the wireless charging receiving end of the electric bicycle into a DC current; the DC buck-boost circuit is used to convert the DC current that fluctuates within a certain range and is output by the high-frequency rectification circuit into a stable DC current, and control the output of the stable DC current through a switching device.

3. The method for rectifying an electric bicycle adaptive wireless charging receiving end according to claim 2, characterized in that: The DC step-up and step-down circuit is mainly composed of a switch tube S5, a switch tube S6, a diode D6, an inductor L1, a capacitor C1 and a capacitor C2. The capacitor C1, the inductor L1 and the capacitor C2 are connected in parallel, and the switch tube S5 is connected between the capacitor C1 and the inductor L1, the switch tube S6 is connected between the inductor L1 and the capacitor C2, the diode D6 is connected to the connecting end of the capacitor C2 and the switch tube S6, the diode D6 and the other end of the capacitor C2 are used for DC output, and the two ends of the capacitor C1 are used for DC input.

4. The method for rectifying an electric bicycle adaptive wireless charging receiving end according to claim 3, characterized in that: The control circuit includes a sensing circuit, a control chip, a drive circuit and an auxiliary power supply circuit. The sensing circuit includes a voltage sensing circuit and a current sensing circuit. The voltage of the main rectifier circuit is monitored in real time by the voltage sensing circuit, and the current of the main rectifier circuit is monitored in real time by the current sensing circuit. The control chip is used to output the control signal of the switch device in the DC buck-boost circuit according to the received sensor circuit output signal and a preset program to meet the charging current requirements of different electric bicycles. The drive circuit is used to convert the control signal output by the control chip into a corresponding voltage signal that actually drives the switch device in the DC buck-boost circuit to turn on or off. The auxiliary power supply circuit is used to provide the required power for the sensing circuit, the control chip and the drive circuit.

5. The method for rectifying an electric bicycle adaptive wireless charging receiving end according to claim 4, characterized in that: The process of the control chip outputting a control signal for controlling the on / off of a switch device in a DC buck-boost circuit is as follows: A1. Preset the program of the control chip. The preset program includes judging the current voltage level of the battery of the electric bicycle, precharging the capacitor in the initial stage of charging, realizing the control closed loop of the DC buck-boost circuit according to the target voltage and current output, and actively closing the control signal output in the event of a fault; A2, judging the current charging voltage level of the electric bicycle battery according to the voltage and current signals of the rectifier main circuit collected by the sensor circuit, and determining the target charging voltage V2; A3. Calculate the error value D based on the target rate voltage and the actual collected voltage, and then calculate the control signal U based on the error value D out , the calculation formula is as follows: ， Among them, V1 is the actual voltage value, is the voltage error at time k, is the proportionality coefficient, is the integration coefficient, is the calculus coefficient, T is the time from moment k-1 to moment k; A4, outputting the calculated control signal to the driving circuit, which converts the received control signal into an actual voltage signal to drive the switch device in the DC buck-boost circuit to turn on or off, and transmits the actual voltage signal to the DC buck-boost circuit; A5, the DC step-up and step-down circuit receives the actual voltage signal to control the switch device to turn on and off, so as to provide a stable DC current for charging the electric bicycle; A6. During the charging process, the actual output voltage and current are monitored in real time through the sensor circuit, and the monitored actual output voltage and current are compared with the target charging voltage and current. The control signal is adjusted according to the comparison result to ensure that the output voltage and current always meet the preset requirements.

6. The method for rectifying an electric bicycle adaptive wireless charging receiving end according to claim 5, characterized in that: The driving circuit is mainly composed of an isolation driving chip U1, a driving resistor R6 and a gate protection resistor R7 connected between the gate and source of the switch tubes S5 and S6. One end of the driving resistor R6 is connected to the connecting end of the resistor R7 and the gate of the switch tube S6 and the connecting end of the resistor R7 and the gate of the switch tube S5. The other end of the driving resistor R6 is connected to the isolation driving chip U1.

7. The method for rectifying an electric bicycle adaptive wireless charging receiving end according to claim 6, characterized in that: When the DC buck-boost circuit is boosting, when the switch tube S5 is turned on and the switch tube S6 is turned off, the input voltage is added to the inductor L1 through the switch tube S5, and at this time the inductor L1 starts to store energy. Due to the filtering effect of the capacitor C1, the input voltage is relatively stable; when the switch tube S5 is turned off and the switch tube S6 is turned on, the current in the inductor L1 will not immediately become 0, but will continue to flow due to the current holding characteristic of the inductor L1. At this time, the inductor charges the capacitor C2 through the diode D6 and provides energy to the load at the same time. Since the polarity of the electromotive force at both ends of the inductor L1 is the same as the polarity of the input power supply when the inductor L1 releases energy, the voltage on the capacitor C2 will be higher than the input voltage, thereby achieving boosting; When reducing the voltage, by adjusting the duty cycle of the switch tubes S5 and S6, when the duty cycle is the smallest, the inductor L1 is in a discharge state for a longer period of time, causing the output voltage to be lower than the input voltage, thereby achieving voltage reduction.

8. The method for rectifying an electric bicycle adaptive wireless charging receiving end according to claim 7, characterized in that: In step S1, the communication between the transmitter and the electric bicycle wireless charging receiver follows the QI standard communication protocol. When performing identity authentication, the transmitter will first send an analog ping signal to detect whether there is an electric bicycle wireless charging receiver placed in the charging area. If the electric bicycle wireless charging receiver is detected, the transmitter sends a digital ping signal to allow the wireless charging receiver time to reply with a signal strength package. If the signal strength package replied by the wireless charging receiver is valid, it indicates that the communication link between the two is successfully established, and then enters S2.

9. The method for rectifying an electric bicycle adaptive wireless charging receiving end according to claim 8, characterized in that: In step S2, the data packet includes the identity information, configuration information, required charging parameters and signal strength packet of the receiving end.

10. The method for rectifying an electric bicycle adaptive wireless charging receiving end according to claim 9, characterized in that: The process of verification and matching after the transmitting end receives the data packet is as follows: B1. After receiving the data packet, the transmitter compares the change of its own output energy with the change of the electrical parameters sent back by the wireless charging receiver. If the changes are consistent, it means that the wireless charging receiver is a compatible and safe charging device and proceeds to B2. If the changes are inconsistent, it means that the wireless charging receiver is not a compatible charging device and the wireless charging receiver of the electric bicycle does not work. B2. The transmitter adjusts its output power according to the configuration information and signal strength packet sent by the wireless charging receiver to match the charging requirements of the wireless charging receiver.

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