TW201635674A - Wireless power transfer and rapid charging system with maximum power tracking and method for the same - Google Patents

Abstract

A wireless power transfer and rapid charging system with maximum power tracking and a method for the same are revealed. The system includes a transmitter device and a receiver device. First the transmitter device performs maximum power tracking and outputs a fixed resonant frequency. Now the receiver device charges a battery. A voltage detection circuit of the receiver device is detecting charging state of the battery. A high-frequency receiving circuitof the transmitter device checks whether a high-frequency transmission circuit transmits a fully-charged signal. When the high-frequency receiving circuitof the transmitter device receives the fully-charged signal that represents the battery is fully charged, the transmitter device shuts down the power and enters standby mode. Thereby wireless charging can be carried out in different environments. The greater transfer distances, lower output impedance, and higher wireless transmission efficiency can be achieved. The speed of wireless charging is also increased.

Description

Wireless power transmission fast charging system and method with maximum power tracking

The invention relates to a wireless power transmission fast charging system and method with maximum power tracking, in particular to a wireless charging method which can be applied in different environments, which can transmit a transmission distance with a long transmission efficiency, and reduce the output impedance. And can be used to significantly improve the efficiency of the overall wireless transmission, while speeding up the wireless charging speed, and in its overall implementation, the utility model of the wireless power transmission fast charging system and method with maximum power tracking.

Press, wireless charging, also known as inductive charging, non-contact inductive charging, is the use of near-field sensing, that is, inductive coupling, by the charger to transfer energy to the device that uses electricity, the device uses the received energy to the battery Charging, and at the same time for its own operation; because the charger and the electrical device are inductively coupled to transmit energy, there is no need to use wire connection between the two, so the charger and the electrical device can be made conductive. The contacts are exposed, making them more convenient to use than wired charging.

The principle of the wireless charging system is electromagnetic induction. Generally speaking, it is mainly used to charge a coil in a wireless charging charger, and the alternating current is used to push the coil to generate an alternating electromagnetic field, and another electric coil is provided in the electric device. The AC electromagnetic field generated by the coil of the charger is received and converted into electric energy, and the received electric energy is used to charge the battery in the electric device and supply power to the electric device.

However, although the above wireless charging system can achieve the expected efficiency, it is also found in its actual implementation, that its wireless transmission distance is limited, the transmission efficiency is not good, and its application environment is limited, and its charging speed is relatively slow. As a result, there is still room for improvement in the overall structural design.

The reason is that the inventor has been rich in design and development and practical production experience of the relevant industry for many years, and has researched and improved the existing structure and defects to provide a wireless power transmission fast charging system and method with maximum power tracking, in order to achieve better. The purpose of practical value.

The main object of the present invention is to provide a wireless power transmission fast charging system and method with maximum power tracking, which can be applied to wireless charging in different environments, which can achieve a transmission efficiency of a long transmission distance and reduce output. Impedance, and can greatly improve the efficiency of the overall wireless transmission, while speeding up the wireless charging speed, and more practical features in its overall implementation.

The main purpose and effect of the wireless power transmission fast charging system with maximum power tracking of the present invention are achieved by the following specific technical means:

It mainly includes a transmitting end device and a receiving end device; wherein:

The transmitting end device is mainly provided with a high frequency receiving circuit for receiving the magnitude of the induced energy of the receiving end device, and the high frequency circuit is connected with a communication decoding circuit, and the communication decoding circuit is provided for the receiving end device The sensing energy is decoded, and the communication decoding circuit is connected with a digital controller, the digital controller is connected with a memory, and the digital controller is connected with a digital to analog converter, and the digital controller is connected to the digital An analog converter is coupled to the voltage controlled oscillator to provide a voltage different from that required by the digital controller and the digital to analog converter to the voltage controlled oscillator, the voltage controlled oscillator being coupled to an anti-overlapping circuit The controlled oscillator uses a constant current inverting oscillator to generate a scanning frequency and is output via an anti-overlap circuit. The anti-overlap circuit is connected with a first phase buffer circuit and a second phase buffer circuit, and the first phase buffer circuit is connected first. a power transistor [Power MOS1], and a second power transistor connected to the second phase buffer circuit [Powe MOS2], the output of the anti-overlap circuit is respectively generated by the first phase buffer circuit and the second phase buffer circuit to generate sufficient driving capability, and then respectively driving the first power transistor and the second power transistor, and then making the first The power transistor and the second power transistor are connected together to the coil to generate a magnetic field, and the coil is connected to the RLC resonant circuit for output;

The receiving end device is mainly provided with a matching RLC resonant circuit corresponding to the RLC resonant circuit of the transmitting end device, a half wave rectifying circuit is connected to the RLC resonant circuit, and a voltage stabilizing unit is connected to the half wave rectifying circuit. A voltage sensing and high frequency transmission signal circuit is connected between the half wave rectifying circuit and the voltage stabilizing unit, and a charging circuit is connected to the voltage stabilizing unit, and the charging circuit is also connected to the voltage sensing and high frequency transmission. a signal circuit, the voltage sensing and high frequency transmission signal circuit is provided with a voltage detection circuit, and a switch is connected to the input end of the voltage detection circuit, the voltage detection circuit is connected with a quantizer, and a controller is connected to the quantizer And a high frequency transmitting circuit is connected to the controller, so that the voltage detected by the voltage detecting circuit can be transmitted from the high frequency transmitting circuit to the high frequency receiving circuit of the transmitting device, and the charging circuit is provided a constant current circuit, and a power transistor is connected to the constant current circuit, so that the power transistor is connected to the battery via a switch to charge the battery Operation, and the cell through the switch is also connected to a load, in order to control the switching state of the switch so that the load on the battery power.

The main purpose and effect of the wireless power transmission fast charging method with maximum power tracking of the present invention are achieved by the following specific technical means:

It includes a transmitting end device and a receiving end device, and is divided into the following three modes in operation control:

A. Maximum power tracking mode: automatically search for the optimal resonant frequency of the system to generate maximum power wireless power transmission;

B. Battery fast charging mode: the receiving end device receives the maximum power transmission and rapidly charges the battery by the current time function;

C. Standby mode: After charging, the digital controller of the transmitting device controls the voltage controlled oscillator to stop the oscillation through the digital to analog converter, and no magnetic field is generated.

A preferred embodiment of the wireless power transmission fast charging method with maximum power tracking according to the present invention, wherein after the power transmitting device is powered on, the maximum power scanning tracking is performed first, and after the maximum power tracking is completed, a fixed output is output. The resonant frequency of the maximum power, at this time, the charging circuit of the receiving device charges the battery, and the voltage sensing and high frequency transmitting signal circuit of the receiving device detects the state of charge of the battery by the voltage detecting circuit, and The high frequency receiving circuit of the transmitting device determines whether the high frequency transmitting circuit receiving the voltage sensing and high frequency transmitting signal circuit has a transmitting full data signal, and when the high frequency receiving circuit of the transmitting device receives the full signal, the representative The battery is fully charged and the transmitter device turns off the power and enters standby mode.

A preferred embodiment of the wireless power transmission fast charging method with maximum power tracking according to the present invention, wherein the transmitting end device generates a digital code control digit to the analog converter by the digital controller during maximum power scan tracking An output voltage, which is then input to the voltage controlled oscillator to generate a scanning frequency capable of providing a wireless power transmission driving current through the first and second phase buffer circuits to drive the first and second power transistors simultaneously The coils connected to the first and second power transistors generate a magnetic field, and the RLC resonant circuit provides high-efficiency radio energy transmission; and the RLC resonant circuit of the receiving device can be converted into electric energy after receiving the magnetic field signal, and The voltage detecting circuit of the voltage sensing and high frequency transmitting signal circuit senses, and the high frequency transmitting circuit of the voltage sensing and high frequency transmitting signal circuit transmits the current frequency sensing power level to the transmitting end device. a high frequency receiving circuit that causes the transmitting device to use the memory connected to the digital controller Recording, and then the digital controller generates another digital code to control the oscillation frequency of the voltage controlled oscillator. After the same step, the transmitting device can receive the sensing level of the frequency again, if the level is stronger than the Recording the stored data will update the frequency and level of the current strong signal. According to this step, after a period of time, the frequency and level of the maximum power transmission can be stored.

A preferred embodiment of the wireless power transmission fast charging method with maximum power tracking according to the present invention, wherein when performing maximum power tracking, the frequency is divided into a coarse frequency band and a fine frequency band, and the scanning frequency is from several hundred KHz to several Pick up KHz, first scan with the coarse frequency band, divide the frequency into M segments, start scanning from the highest frequency, continue scanning to the lower frequency in sequence, and record the maximum frequency and level value at the transmitting end. In the built-in register of the digital controller of the device, after sweeping to the lowest frequency, the coarse-order frequency scanning is ended; when the coarse-order frequency is scanned, the largest power point in the coarse order is found, and the most optimal frequency point is obtained by the coarse order. The frequency of both ends of the good frequency is scanned in a fine-order frequency band, the finest scanning frequency of the voltage controlled oscillator is controlled, the frequency point and the level value of the maximum level are recorded in the temporary register, and at the end of the fine-level scanning, the temporary register The stored frequency point is the maximum power tracking optimum resonant frequency point.

A preferred embodiment of the wireless power transmission fast charging method with maximum power tracking, wherein when the maximum voltage search is performed, the signal data is transmitted from the receiving device to the transmitting device, and the receiving device transmits the data first. The start code is transmitted, and the data is transmitted after the start code is transmitted. After the data code is transmitted as a whole, the end code is transmitted, indicating that the data transfer is completed; and when the transmitting device receives the signal, the signal is sent to the digital controller. When the digital controller receives the start code, it will start receiving the data code. Each received data received three data, there must be two or more identical [including two pens], the data will be established, and the receiving is completed. After receiving the data code, the end code is received, indicating that the data has been received. In the maximum power tracking, the received data code is the value of the induced voltage of the receiving device. After each data is received, it will be the same as the previous time. The received voltage value is compared. If the received voltage value is larger than the previous received value, the previous data is replaced.

A preferred embodiment of the wireless power transmission fast charging method with maximum power tracking, wherein the receiving device includes two switches for mode control; and in the maximum power tracking mode, the half wave rectifying circuit and voltage regulation are provided. The switch between the units is turned on, and the switch is switched to be connected to the load; in the charging mode, the switch is turned off, the switch is switched to charge the battery; in the maximum power scan, different frequencies may be different The voltage value is used as a load at the input end by using a small resistor, and the currently tracked voltage is converted into a digital code through a high frequency transmitting circuit, and the currently tracked voltage value is transmitted to the high frequency receiving circuit of the transmitting device, if the receiving end After receiving the current voltage value, the device will retransmit the new frequency and continue tracking in the same way. After the tracking is completed, the maximum resonant frequency point will be found. At this time, the charging circuit will switch to the charging mode to allow the battery to charge normally. .

A preferred embodiment of the wireless power transmission fast charging method with maximum power tracking according to the present invention, wherein when the charging control is performed, the quantizer of the voltage sensing and high frequency transmission signal circuit sends the analog voltage value to the controller First, the start code is transmitted, and then the digital code of the transmitted voltage value is transmitted N times, and then the end code is transmitted to inform the transmitter that the data has been transmitted, and then it is judged whether the analog voltage value has changed. When the time has not changed, the maximum power value has been reached. The charging circuit automatically enters the charging mode. When the battery is charging, it will continue to judge whether the battery voltage is fully charged. When the battery is fully charged, the voltage sensing and The high-frequency transmission signal circuit will transmit a set of signals to the transmitting end device to inform that the charging has been completed, and the transmitting end device knows that the power is automatically turned off and enters the waiting machine mode.

A preferred embodiment of the wireless power transmission fast charging method with maximum power tracking according to the present invention, wherein the charging circuit also includes a voltage controller, a time controller, a controller, and a current output controller, the voltage controller and the time control The controller is connected to the controller, and the controller is connected to the current output controller, and the controller is used to determine whether the battery is charged, and the magnitude of the current is selected by the judgment of the voltage during charging. Before the battery voltage V1, I1 is used as the charging current, and the battery voltage is used. If it is greater than V1, the current switches to I2. When the battery voltage rises to V2, the current is switched to I3. When the battery voltage is saturated, the time controller is used. The current is gradually reduced to I2 from I3 over a period of time, and then gradually decreases over a period of time. To I1, the charging is terminated after a period of time, where I3>I2>I1 and V2>V1.

A preferred embodiment of the wireless power transmission fast charging method with maximum power tracking according to the present invention, wherein when the voltage is detected by the charging circuit, the voltage controller is an inverter, and the inverter P and the N transistor are used. When the ratio is adjusted to different voltage points, three transition point input controllers can be cut out; the detection voltage is V _f =V _CC -V _{b attery} , and the larger the battery voltage V _{battery is} , the smaller the detection voltage is V _f . The controller controls the current drive end to generate different current values to charge the battery according to the detection voltage.

For a more complete and clear disclosure of the technical content, the purpose of the invention and the effects thereof achieved by the present invention, it is explained in detail below, and please refer to the drawings and drawings:

First, please refer to the first diagram of the overall architecture diagram of the present invention. The present invention mainly includes a transmitting end device (1) and a receiving end device (2); wherein:

The transmitting end device (1), please refer to the second figure, the schematic diagram of the circuit structure of the transmitting end device of the present invention, which is mainly provided with a high frequency receiving circuit (11) for receiving the receiving end The induction energy of the device (2) is connected to the high frequency circuit (11) with a communication decoding circuit (12) for decoding the inductive energy of the receiving device (2). The communication decoding circuit (12) is connected with a digital controller (13), the digital controller (13) is connected with a memory (131), and the digital controller (13) is connected with a digital to analog converter (14), and The digital controller (13) and the digital to analog converter (14) are coupled to a voltage controlled oscillator (15) for providing voltage to the digital controller (13) and the digital to analog converter (14) Control the oscillator (15) on different voltages, different voltages produce different output frequencies for maximum power tracking, the voltage controlled oscillator (15) An anti-overlap circuit (16) is connected. The voltage-controlled oscillator (15) uses a constant current inverting oscillator to generate a scanning frequency, and outputs Ho and Lo signals. The Ho and Lo waveforms are 180 degrees out of phase, and the waveform is up and down complementary. The output is connected via an anti-overlap circuit (16), and the anti-overlap circuit (16) is connected to the first phase buffer circuit (171) and the second phase buffer circuit (172), and the first phase buffer circuit (171) A first power transistor (181) [Power MOS1] is connected, and a second power transistor (182) [Power MOS2] is connected to the second phase buffer circuit (172) for output by the anti-overlap circuit (16). The upper and lower complementary waveforms respectively generate sufficient driving capability through the first phase buffer circuit (171) and the second phase buffer circuit (172), and respectively drive the first power transistor (181) and the second power transistor respectively. (182), capable of reducing the first power transistor (181) and the second power The circuit (182) is simultaneously short-circuited to cause a circuit burnout and power consumption, and the first power transistor (181) and the second power transistor (182) are connected together to the coil (19) to generate a magnetic field. The coil (19) is connected to the RLC resonant circuit (10) for output, and the RLC resonant circuit (10) is a hybrid string parallel RLC resonant circuit (10).

The receiving end device (2), please refer to the third figure, the schematic diagram of the circuit structure of the receiving end device of the present invention, which mainly corresponds to the RLC resonant circuit (10) corresponding to the transmitting end device (1), and is provided with a matching RLC resonant circuit. (21) A half-wave rectifying circuit (22) is connected to the RLC resonant circuit (21), and a voltage stabilizing unit (23) is connected to the half-wave rectifying circuit (22), and the half-wave rectifying circuit (22) is connected to the half-wave rectifying circuit (22). A voltage sensing and high frequency transmission signal circuit (24) is connected between the voltage stabilizing unit (23), and a charging circuit (25) is connected to the voltage stabilizing unit (23), and the charging circuit (25) is also connected. Up to the voltage sensing and high frequency transmission signal circuit (24), such that when the RLC resonant circuit (21) senses the energy transmitted by the RLC resonant circuit (10) of the transmitting device (1), it can receive energy And converting the voltage into a DC voltage regulator through the half-wave rectifying circuit (22) and the voltage stabilizing unit (23) to provide the voltage sensing and high The frequency transmission signal circuit (24) is used with a charging circuit (25), and the voltage sensing and high frequency transmission signal circuit (24) is used for maximum power tracking, the voltage sensing and high frequency transmission signal circuit (24) A voltage detecting circuit (241) is provided, and a switch (245) is connected to the input end of the voltage detecting circuit (241), and the voltage detecting circuit (241) is connected with a quantizer (242) and is used in the quantizer (242). A controller (243) is connected, and a high frequency transmitting circuit (244) is connected to the controller (243), so that the voltage detected by the voltage detecting circuit (241) can be used by the high frequency transmitting circuit ( 244) transmitting to the high frequency receiving circuit (11) of the transmitting device (1), wherein the charging circuit (25) is provided with a constant current circuit (251), and the constant current circuit (251) is connected with a power transistor ( 252), the power transistor (252) is connected to the battery (254) via the switch (253) to enable the battery 254) performing a charging operation, and the battery (254) is also connected to the load (255) via the switch (253) to control the switching state of the switch (253) to cause the battery (254) to perform load (255) When the battery (254) is fully charged, it can also be sensed by the voltage sensing and high frequency transmission signal circuit (24), and transmitted by the high frequency transmitting circuit (244) to the transmitting device (1). The high frequency receiving circuit (11) causes the transmitting end device (1) to turn off the power.

In this way, the present invention is divided into the following three modes in operation control:

A. Maximum power tracking mode: automatically search for the optimal resonant frequency of the system to generate maximum power wireless power transmission;

B. Battery fast charging mode: the receiving end device (2) receives the maximum power transmission and rapidly charges the battery (254) by the current time function;

C. Standby mode: After charging, the digital controller (13) controls the voltage controlled oscillator (15) to stop the oscillation via the digital to analog converter (14), and no magnetic field is generated;

Please refer to the fourth diagram of the control flow diagram of the present invention. The present invention first performs maximum power scan tracking after the transmitter device (1) is powered on. When the maximum power is tracked, a fixed output is output. The maximum power resonance frequency, at this time, the charging circuit (25) of the receiving device (2) charges the battery (254), and the voltage sensing and high frequency transmitting signal circuit of the receiving device (2) (24) The voltage detection circuit (241) detects the state of charge of the battery (254), and causes the high frequency receiving circuit (11) of the transmitting device (1) to determine the receiving of the voltage sensing and high frequency transmitting signal circuit (24) Whether the high frequency transmitting circuit (244) has a full charge signal, and when the high frequency receiving circuit (11) of the transmitting device (1) receives the full signal, the battery (254) is fully charged. The transmitter device (1) will turn off the power and enter standby mode.

When the transmitting device (1) performs maximum power scan tracking, the digital controller (13) generates a digital code control digit to the output voltage of the analog converter (14), and the voltage is input to the voltage controlled oscillator. (15) to generate a scanning frequency capable of providing a wireless power transmission driving current through the first and second phase buffer circuits (171), (172) to drive the first and second power transistors (181), (182), simultaneously generating a magnetic field by the coil (19) connected by the first and second power transistors (181), (182), and then providing high-efficiency radio energy transmission by the RLC resonant circuit (10); and the receiving The RLC resonant circuit (21) of the terminal device (2) can be converted into a power level after receiving the magnetic field signal, and is sensed by the voltage sensing circuit (241) of the voltage sensing and high frequency transmitting signal circuit (24). The current frequency sensing is performed by the high frequency transmitting circuit (244) of the voltage sensing and high frequency transmitting signal circuit (24) The power level is transmitted to the high frequency receiving circuit (11) of the transmitting device (1), so that the transmitting device (1) uses the memory (131) connected to the digital controller (13). Recording, and then the digital controller (13) generates another digital code to control the oscillation frequency of the voltage controlled oscillator (15). After the same steps, the transmitting device (1) can receive the frequency again. Sensing level, if the level is stronger than the recorded data, it will update the frequency and level of the current strong signal. According to this step, after a period of time, the frequency and bit of the maximum power transmission can be stored. quasi.

Please refer to the fifth figure for the maximum power tracking process diagram of the present invention. When the maximum power tracking is performed, the frequency division is divided into a coarse frequency band and a fine frequency band, and the scanning frequency is from several hundred KHz to several Pick up KHz, first scan with the coarse frequency band, divide the frequency into M segments, start scanning from the highest frequency, continue scanning to the lower frequency in sequence, and record the maximum frequency and level value at the transmitting end. In the built-in register of the digital controller (13) of the device (1), after sweeping to the lowest frequency, the coarse-order frequency scanning is ended; when the coarse-order frequency is scanned, the largest power point in the coarse order is found, and the coarsest order is the most Good frequency points take the frequency of the two ends of the best frequency for fine-band scanning, control the finest scanning frequency of the voltage controlled oscillator (15), record the frequency and level of the maximum level in the register, fine At the end of the order scan, the stored frequency point of the register is the maximum power tracking optimum resonant frequency point.

In the present invention, when performing the maximum voltage search, please refer to the sixth diagram of the present invention as shown in the schematic diagram of the maximum voltage search and comparison process, and the signal data is transmitted from the receiving device (2) to the transmitting device (1). The receiving device (2) transmits the activation code first, and transmits the data after transmitting the start code. After the data code is completely transmitted, the end code is transmitted, indicating that the data transmission ends; and when the transmitting device is installed (1) When receiving the signal, the signal is sent to the digital controller (13). When the digital controller (13) receives the start code, it will start receiving the data code, and each received data is received in three data. If there are more than two identical [including two strokes], the data will be established. After receiving the data code, the end code will be received, indicating that the data has been received. In the maximum power tracking, the received data code is The value of the induced voltage of the receiving device (2), after each data is received, it will be compared with the voltage value received before, if the voltage value received this time is higher than the previous time When the received value is larger, the previous data is replaced.

In addition, the receiving end device (2) may include two switches for mode control; in the maximum power tracking mode, the switch (245) disposed between the half-wave rectifying circuit (22) and the voltage stabilizing unit (23) is turned on, The switch (253) is switched to be connected to the load; and in the charging mode, the switch (245) is turned off, and the switch (253) is switched to charge the battery (254). In the maximum power sweep, different voltages will have different voltage values, use a small resistor as the load at the input, and convert the currently tracked voltage into a digital code through the high frequency transmit circuit (244), which will be tracked to the present. The voltage value is transmitted to the high frequency receiving circuit (11) of the transmitting device (1). If the receiving device (2) receives the current voltage value, it will retransmit the new frequency and continue tracking in the same manner. After the tracking is completed, find the maximum resonant frequency point. At this time, the charging circuit (25) will switch to the charging mode to allow the battery (254) to charge normally.

Moreover, please refer to the seventh diagram of the charging control flow diagram of the present invention. When the charging control is performed, the voltage sensing and the quantizer (242) of the high frequency transmission signal circuit (24) will be analogized. The voltage value is sent to the controller (243), and the start code is transmitted first, and then the digital code of the transmitted voltage value is transmitted N times, and then the end code is transmitted to inform the transmitting end that the data has been transmitted, and then judged. Whether the analog voltage value has changed, if the maximum power value has been reached if it has not changed for a period of time, the charging circuit (25) automatically enters the charging mode, and the battery (254) continues to judge when charging, and determines the battery. (254) Whether the voltage is fully charged, when the battery (254) is full, the voltage sensing and high frequency transmission signal circuit (24) will transmit a set of signals to the transmitting device (1), indicating that the charging has been completed, transmitting The end device (1) knows that the power is automatically turned off and enters the servo mode.

Please refer to the eighth diagram of the charging circuit architecture diagram of the present invention. The charging circuit (25) also includes a voltage controller (256), a time controller (257), a controller (258), and a current output. a controller (259), the voltage controller (256) and the time controller (257) are connected to the controller (258), and the controller (258) is connected to the current output controller (259), using the controller ( 258) judging whether the battery (254) is charged, determining the magnitude of the current through the determination of the voltage during charging, using I1 as the charging current before the voltage (V1) of the battery (254), and switching the current to I2 when the voltage of the battery (254) is greater than V1. When the voltage of the battery (254) rises to V2, the current is switched to I3, and when the voltage of the battery (254) is charged to saturation, the time controller (257) is used, and the current is gradually decreased from I3 to I2 over a period of time, and then gradually decreases to a certain period of time. I1, then charge again after a period of time, where I3>I 2>I1 and V2>V1.

Therefore, when the present invention is used to charge a 4.2V lithium battery (254), please refer to the ninth figure. The charging current graph of the 4.2V lithium battery of the present invention shows that the rechargeable battery (254) has a voltage of less than 3 At .7V, the charging current is 100mA, the charging battery (254) voltage is greater than 3.7V at 4V, the charging current is 300mA, the charging current is 500mA when the voltage is greater than 4V, and the charging battery (254) voltage is charged to 4. At 2 o'clock, the charging current is reduced to 300 mA, the charging time is 5 minutes, and the charging current is reduced to 100 mA. After the charging time is 5 minutes, the overall charging is completed.

The charging circuit (25), when performing voltage detection, the voltage controller (256) can be an inverter, and the voltage points of the inverters P and N are proportional to different voltage points, please refer to The tenth figure of the inverter voltage detection switching point graph of the present invention can cut out three transition point input controllers (258); the detection voltage is V _f =V _CC -V _{b attery} , the battery voltage V _The larger the _battery , the smaller the detection voltage is V _f . The controller controls the current drive end to generate different current values to charge the battery according to the detection voltage.

Based on the above description, the composition and use of the structure of the present invention show that the present invention is mainly applicable to wireless charging in different environments, and the transmission efficiency can be longer. Distance, and to reduce the output impedance, and can greatly improve the efficiency of the overall wireless transmission, while speeding up the wireless charging speed, and in the overall implementation of the use of more practical features. .

However, the above-described embodiments or drawings are not intended to limit the structure or the use of the present invention, and any suitable variations or modifications of the invention will be apparent to those skilled in the art.

In summary, the embodiments of the present invention can achieve the expected use efficiency, and the specific structure disclosed therein has not been seen in similar products, nor has it been disclosed before the application, and has completely complied with the provisions of the Patent Law. And the request, the application for the invention of a patent in accordance with the law, please forgive the review, and grant the patent, it is really sensible.

(1)‧‧‧transmitting device (11)‧‧‧ high frequency receiving circuit

(12)‧‧‧Communication decoding circuit (13)‧‧‧ digit controller

(131)‧‧‧ Memory (14)‧‧‧Digital to Analog Converter

(15)‧‧‧Voltage-controlled oscillator (16)‧‧‧Anti-overlap circuit

(171)‧‧‧First phase buffer circuit (172)‧‧‧Second phase buffer circuit

(181)‧‧‧First power transistor (182)‧‧‧second power transistor

(19)‧‧‧ coil (10)‧‧‧RLC resonant circuit

(2) ‧‧‧Receiver device (21)‧‧‧RLC resonant circuit

(22) ‧‧‧Half-wave rectifier circuit (23) ‧‧‧ voltage regulator unit

(24)‧‧‧Voltage sensing and high frequency transmission signal circuit

(241)‧‧‧Voltage detection circuit (242)‧‧‧Quantifier

(243) ‧ ‧ controller (244) ‧ ‧ high frequency transmitting circuit

(245)‧‧‧Switch (25)‧‧‧Charging circuit

(251)‧‧‧Constant current circuit (252)‧‧‧ Power transistor

(253)‧‧‧Switch (254)‧‧‧Battery

(255)‧‧‧Load (256)‧‧‧ voltage controller

(257) ‧ ‧ time controller (258) ‧ ‧ controller

(259)‧‧‧ Current Output Controller

First: Schematic diagram of the overall architecture of the present invention

Second: Schematic diagram of the circuit structure of the transmitting device of the present invention

Third: Schematic diagram of the circuit structure of the receiving end device of the present invention

Fourth: Schematic diagram of the control flow of the present invention

Figure 5: Schematic diagram of the maximum power tracking process of the present invention

Figure 6: Schematic diagram of the maximum voltage search comparison process of the present invention

Figure 7: Schematic diagram of the charging control process of the present invention

Figure 8: Schematic diagram of the charging circuit architecture of the present invention

Figure IX: Charging current curve of the 4.2V lithium battery of the present invention

The tenth figure: the voltage detection switching point curve of the inverter of the present invention

(1) ‧‧‧transmitting device

(2) ‧‧‧ receiving device

Claims (10)

A wireless power transmission fast charging system with maximum power tracking, which mainly comprises a transmitting end device and a receiving end device; wherein: the transmitting end device is mainly provided with a high frequency receiving circuit, and the high frequency receiving circuit is accepted a receiving and decoding device is connected to a communication decoding circuit, wherein the communication decoding circuit is configured to decode the sensing energy of the receiving device, and the digital decoding controller is connected to the communication decoding circuit. A memory is connected, and a digital to analog converter is connected to the digital controller, and the digital controller and the digital to analog converter are connected to the voltage controlled oscillator to utilize the digital controller and the digital to analog conversion The voltage is supplied to the voltage controlled oscillator, and the voltage controlled oscillator is connected with an anti-overlap circuit. The voltage controlled oscillator uses a constant current inverting oscillator to generate a scanning frequency and outputs the output through the anti-overlap circuit. The overlapping circuit is connected with the first phase buffer circuit and the second phase buffer circuit, and the first phase buffer circuit is connected with the first work a power transistor [Power MOS1], and a second power transistor [Power MOS2] is connected to the second phase buffer circuit, so that the output of the anti-overlap circuit is generated by the first phase buffer circuit and the second phase buffer circuit respectively. Driven to drive the first power transistor and the second power transistor separately, and then connect the first power transistor and the second power transistor to the coil to generate a magnetic field, and connect the coil The RLC resonant circuit performs output; the receiving end device is mainly provided with a matching RLC resonant circuit corresponding to the RLC resonant circuit of the transmitting end device, and a half wave rectifying circuit is connected to the RLC resonant circuit, and the half wave rectifying circuit is connected A voltage stabilizing unit is connected to the circuit, and a voltage sensing and high frequency transmitting signal circuit is connected between the half wave rectifying circuit and the voltage stabilizing unit, and a charging circuit is connected to the voltage stabilizing unit, and the charging circuit is also connected to the Voltage sensing and high frequency transmission signal circuit, the voltage sensing and high frequency transmission signal circuit is provided with a voltage detection circuit A switch is connected to the input end of the voltage detecting circuit, the voltage detecting circuit is connected with a quantizer, and a controller is connected to the quantizer, and a high frequency transmitting circuit is connected to the controller to enable the voltage detection. The voltage detected by the circuit is transmitted from the high frequency transmitting circuit to the high frequency receiving circuit of the transmitting device, and the charging circuit is provided with a constant current circuit, and the power transistor is connected to the constant current circuit to make the power The crystal is connected to the battery via the switch to enable the battery to be charged, and the battery is also connected to the load via the switch to control the switching state of the switch to supply power to the load. A wireless power transmission fast charging method with maximum power tracking, which comprises a transmitting end device and a receiving end device, and is divided into the following three modes in operation control: A. Maximum power tracking mode: automatic search system optimal resonant frequency , generating maximum power wireless power transmission; B. battery fast charging mode: the receiving end device receives the maximum power transmission and fast charging the battery by the current time function; C. standby mode: after charging, the digital controller of the transmitting device is digitally The analog converter controls the voltage controlled oscillator to stop oscillating and no magnetic field is generated. The wireless power transmission fast charging method with maximum power tracking as described in claim 2, wherein after the power transmitting device turns on the power, the maximum power scan tracking is performed first, and after the maximum power tracking is completed, a The fixed maximum power resonant frequency, at this time, the charging circuit of the receiving end device charges the battery, and the voltage sensing circuit and the high frequency transmitting signal circuit of the receiving end device detect the battery charging state by the voltage detecting circuit. And the high frequency receiving circuit of the transmitting device determines whether the high frequency transmitting circuit receiving the voltage sensing and high frequency transmitting signal circuit has a transmitting full data signal, and when the high frequency receiving circuit of the transmitting device receives the full signal , the battery is fully charged, and the transmitter device turns off the power and enters standby mode. The wireless power transmission fast charging method with maximum power tracking as described in claim 2 or 3, wherein the transmitting device generates a digital code control digit by the digital controller when performing maximum power scan tracking to The output voltage of the analog converter, which is then input to the voltage controlled oscillator to generate a scanning frequency, which can provide a wireless power transmission driving current through the first and second phase buffer circuits to drive the first and second power a crystal, wherein a magnetic field is generated by a coil connected by the first and second power transistors, and the RLC resonant circuit provides high-efficiency radio energy transmission; and the RLC resonant circuit of the receiving device can be converted into a magnetic field signal The electric energy is sensed by a voltage sensing circuit of the voltage sensing and high frequency transmitting signal circuit, and the high frequency transmitting circuit of the voltage sensing and high frequency transmitting signal circuit transmits the current frequency sensing power level to a high frequency receiving circuit of the transmitting device, so that the transmitting device connects the frequency and the level by using the digital controller The memory is recorded, and the digital controller generates another digital code to control the oscillation frequency of the voltage controlled oscillator. After the same step, the transmitting device can receive the sensing level of the frequency again, if the level is strong. The data stored in the record will be updated to the frequency and level of the current strong signal. After this period of time, the frequency and level of the maximum power transmission can be stored. The wireless power transmission fast charging method with maximum power tracking as described in claim 2 or 3, wherein when performing maximum power tracking, the frequency is divided into a coarse frequency band and a fine frequency band, and the scanning frequency is from a few Hundreds of KHz ~ a few KHz, first scan with the coarse frequency band, divide the frequency into M segments, start scanning from the highest frequency, continue scanning to the lower frequency in sequence, and record the frequency and level of the maximum level. In the register built in the digital controller of the transmitting device, the coarse frequency sweep is ended after sweeping to the lowest frequency; when the coarse frequency sweep, the largest power point in the coarse step is found, and the coarse order is optimal. The frequency point takes the frequency of the two ends of the optimal frequency for fine-order frequency band scanning, controls the finest scanning frequency of the voltage controlled oscillator, records the frequency level and level value of the maximum level in the temporary register, and at the end of the fine-level scanning, The stored frequency point of the register is the maximum power tracking optimum resonant frequency point. The wireless power transmission fast charging method with maximum power tracking as described in claim 2 or 3, wherein when the maximum voltage search is performed, the signal data is transmitted from the receiving device to the transmitting device, and the receiving device is The transmission data will be transmitted first, and the data will be transmitted after the start code is transmitted. After the data code is transmitted as a whole, the end code will be transmitted, indicating that the data transmission is finished. When the transmitting device receives the signal, the signal is sent to The digital controller, when the digital controller receives the start code, will start to receive the data code, and each received data will receive two or more of the same data [including two pens]. After the receipt of the data code, the end code is received, indicating that the data has been received. In the maximum power tracking, the received data code is the value of the induced voltage of the receiving device. After each data is received, It will be compared with the voltage value received the previous time. If the voltage value received this time is larger than the value received the previous time, the previous data will be replaced. The wireless power transmission fast charging method with maximum power tracking as described in claim 2 or 3, wherein the receiving device includes two switches for mode control; and in the maximum power tracking mode, is set for half-wave rectification. The switch between the circuit and the voltage stabilizing unit is turned on, and the switch is switched to be connected to the load; and in the charging mode, the switch is turned off, the switch is switched to charge the battery; in the maximum power scan, at different frequencies, There will be different voltage values, using a small resistor as the load at the input, and converting the currently tracked voltage into a digital code through the high frequency transmitting circuit, transmitting the currently tracked voltage value to the high frequency receiving circuit of the transmitting device. If the receiving device receives the current voltage value, it will retransmit the new frequency and continue tracking in the same way. After the tracking is completed, the maximum resonant frequency point is found, and the charging circuit will switch to the charging mode. Let the battery charge properly. The wireless power transmission fast charging method with maximum power tracking as described in claim 2 or 3, wherein when the charging control is performed, the quantizer of the voltage sensing and high frequency transmission signal circuit sends the analog voltage value To the controller, the start code is transmitted first, and then the digital code of the transmitted voltage value is transmitted N times, and then the end code is transmitted to inform the transmitter that the data has been transmitted, and then the analog voltage value is judged whether Change, if it has not changed for a period of time, the maximum power value has been reached, the charging circuit automatically enters the charging mode, the battery will continue to judge when charging, determine whether the battery voltage is fully charged, when the battery is full, The voltage sensing and high frequency transmission signal circuit will transmit a set of signals to the transmitting end device to inform that the charging has been completed, and the transmitting end device knows that the power is automatically turned off and enters the waiting machine mode. The wireless power transmission fast charging method with maximum power tracking as described in claim 2 or 3, wherein the charging circuit further includes a voltage controller, a time controller, a controller, and a current output controller, and the voltage control The controller and the time controller are connected to the controller, and the controller is connected to the current output controller, and the controller is used to determine whether the battery is charged, the magnitude of the current is selected by the judgment of the voltage during charging, and the battery is used before the battery voltage V1 is charged. Current, if the battery voltage is greater than V1, the current switches to I2. When the battery voltage rises to V2, the current is switched to I3. When the battery voltage is saturated, the time controller is used. The current is gradually reduced to I2 from I3 over a period of time. After a period of time, it gradually drops to I1, and then ends charging for a period of time, where I3>I2>I1 and V2>V1. The wireless power transmission fast charging method with maximum power tracking as described in claim 2 or 3, wherein the voltage controller is an inverter when using the voltage detection, and the inverter P is used. N transistor size can be adjusted to different voltage points, and three transition point input controllers can be cut out; the detection voltage is V _f =V _CC -V _{b attery} , and the larger the battery voltage V _{battery is} , the detection voltage is V _The smaller the _{f is} , the controller controls the current drive end to generate different current values to charge the battery according to the detection voltage.