Power transmission method

Abstract

The invention provides a power transmission method, and relates to the technical field of equipment charging. The method is applied to the power transmission device. The power transmission device comprises an input end circuit, an output end circuit, a transformer, a voltage input end and a voltage output end. The transformer is connected with a voltage input end and a voltage output end; the input end circuit is connected with a voltage input end and the first magnetic coupling device; the output end circuit is connected with the voltage output end and the second magnetic coupling device; the method comprises the following steps: outputting a power adjustment signal based on the second magnetic coupling device through the output end circuit; wherein the power adjustment signal is an adjustment signal which is determined according to the voltage condition of the voltage output end and represents different power adjustment degrees; and receiving the power adjustment signal through the input end circuit based on the first magnetic coupling device so as to control the transformer to perform power adjustment based on the power adjustment signal. A magnetic coupling device can be used as an isolation feedback device to transmit a power adjustment signal, so that the transformer is controlled to perform power transmission and adjustment.

Description

Technical Field

[0001] The present application relates to the technical field of device charging, and in particular to a power transmission method. Background Art

[0002] In signal transmission, optocouplers are currently commonly used as isolated feedback devices for signal transmission to achieve conversion between electrical signals and optical signals, thereby performing power transmission and adjustment during the charging process of the terminal device.

[0003] However, in the process of using optocouplers for signal transmission, optocouplers tend to age and fail during long-term use, which results in abnormal power transmission and adversely affects the charging process of terminal devices. Summary of the invention

[0004] In view of this, an object of an embodiment of the present application is to provide a power transmission method to improve the problem of poor charging effect caused by using an optocoupler device for signal transmission in the prior art.

[0005] In order to solve the above problems, in a first aspect, an embodiment of the present application provides a power transmission method, which is applied to a power transmission device, wherein the power transmission device includes: an input circuit, an output circuit, a transformer, a voltage input terminal and a voltage output terminal; the transformer connects the voltage input terminal and the voltage output terminal; the input circuit connects the voltage input terminal and a first magnetic coupling device; the output circuit connects the voltage output terminal and a second magnetic coupling device; the method includes:

[0006] Outputting a power adjustment signal based on the second magnetic coupling device through the output end circuit; wherein the power adjustment signal is an adjustment signal representing different power adjustment degrees determined according to the voltage condition of the voltage output end;

[0007] The power adjustment signal is received through the input circuit based on the first magnetic coupling device, so as to control the transformer to perform power adjustment based on the power adjustment signal.

[0008] In the above implementation process, a magnetic coupling device can be used as an isolation feedback device, and the control center can be set in the input circuit to determine the power adjustment demand according to the actual voltage condition of the voltage output end, thereby determining the power adjustment signal representing different power adjustment degrees. The power adjustment signal is transmitted through the magnetic coupling device, so that the transformer is controlled to transmit and adjust the power according to the transmitted power adjustment signal through the input circuit. There is no need to set up an optocoupler device for signal transmission, which can effectively reduce the aging or failure of the isolation feedback device, thereby reducing the charging failure caused by the failure of the isolation feedback device, extending the service life of the power transmission device, optimizing the use effect of the power transmission device, and providing users with a stable and efficient charging process.

[0009] Optionally, the power adjustment signal includes an amplitude shift keying signal or a frequency shift keying signal.

[0010] In the above implementation process, when the magnetic coupling device is used for signal transmission, the power adjustment signal can be various types of modulation signals such as an amplitude shift keying signal or a frequency shift keying signal.

[0011] Optionally, the outputting a power adjustment signal based on the second magnetic coupling device through the output end circuit includes:

[0012] Acquire an output voltage signal of the voltage output terminal connected to the rectifier circuit and a reference voltage signal of the reference voltage connected to the encoder;

[0013] Performing digital encoding based on the output voltage signal and the reference voltage signal to obtain the power adjustment signal;

[0014] The power adjustment signal is transmitted to the first magnetic coupling device through the second magnetic coupling device.

[0015] In the above implementation process, when the control center is set in the input end circuit, digital encoding is performed based on the output voltage signal in the acquired voltage output end and the reference voltage signal in the reference voltage to obtain a corresponding power adjustment signal, and the power adjustment signal is transmitted to the first magnetic coupling device through the second magnetic coupling device for the input end circuit to control the power adjustment.

[0016] Optionally, the performing digital encoding based on the output voltage signal and the reference voltage signal to obtain the power adjustment signal includes:

[0017] determining a voltage difference according to the output voltage signal and the reference voltage signal;

[0018] Comparing the voltage difference with a preset reference value to obtain a plurality of comparison results representing a plurality of power adjustment degrees;

[0019] Determining bit information according to signal characteristic information;

[0020] Digital encoding is performed based on the comparison result and the bit information to obtain the power adjustment signal.

[0021] In the above implementation process, when performing digital encoding, the voltage difference between the output voltage signal and the reference voltage signal can be calculated to compare the voltage difference with a preset reference value to determine a comparison result representing different power adjustment degrees, and the corresponding bit information can be determined based on the signal characteristic information of the power adjustment signal, so as to perform corresponding digital encoding based on the comparison result and the bit information to obtain a power adjustment signal representing different power adjustment degrees.

[0022] Optionally, the preset reference value includes a first reference value and a second reference value; the preset reference value is determined by:

[0023] determining an output voltage requirement and a response regulation requirement of the power transmission device;

[0024] determining the first reference value based on an output voltage requirement;

[0025] The second reference value is determined based on the response adjustment requirement and the first reference value.

[0026] In the above implementation process, a plurality of corresponding preset reference values ​​can be determined according to the output voltage requirement and the corresponding regulation requirement of the power transmission device, so as to determine the degree of power adjustment according to a variety of different actual situations.

[0027] Optionally, the voltage difference is compared with a preset reference value to obtain multiple comparison results representing multiple power adjustment degrees, including:

[0028] If the comparison result is that the voltage difference is less than 0 and greater than the negative value of the first reference value, the power adjustment degree is to reduce the output power of the first ratio;

[0029] If the comparison result is that the voltage difference is less than or equal to the negative value of the first reference value and greater than the negative value of the second reference value, the power adjustment degree is to reduce the output power of the second ratio, and the second ratio is greater than the first ratio;

[0030] If the comparison result is that the voltage difference is greater than or equal to 0 and less than the first reference value, the power adjustment degree is to increase the output power by a third ratio;

[0031] If the comparison result is that the voltage difference is greater than or equal to the first reference value, the power adjustment degree is to increase the output power by a fourth ratio, and the fourth ratio is greater than the third ratio;

[0032] If the comparison result is that the voltage difference is less than or equal to the negative value of the second reference value, the power adjustment level is to turn off the output power.

[0033] In the above implementation process, it is possible to determine corresponding multiple reference values ​​according to the actual demand for the output voltage, and form multiple different numerical intervals according to the multiple reference values ​​and the negative values ​​of the multiple reference values, so as to determine the corresponding comparison results according to the numerical interval described by the voltage difference, so as to meet various voltage requirements and rapid response requirements according to different comparison results.

[0034] Optionally, receiving the power adjustment signal based on the first magnetic coupling device through the input end circuit to control the transformer to adjust power based on the power adjustment signal includes:

[0035] Performing frequency selection processing on the received power adjustment signal to obtain a frequency selected signal;

[0036] Decoding the frequency-selected signal to obtain first driving information;

[0037] Controlling a first conduction condition of the input end circuit based on the first driving information;

[0038] The transformer is controlled to perform power adjustment based on the first conduction condition.

[0039] In the above implementation process, when the control center is set in the input end circuit, the power adjustment signal can be selected and decoded in turn by multiple devices set in the input end circuit according to the type of the power adjustment signal to obtain the corresponding first drive information, and the first conduction condition of the input end circuit is controlled according to the first drive information, so as to control the transformer to perform power adjustment according to the first conduction condition of the input end circuit, and the input end circuit can quickly and effectively control the power adjustment.

[0040] Optionally, receiving the power adjustment signal based on the first magnetic coupling device through the input end circuit to control the transformer to adjust power based on the power adjustment signal includes:

[0041] Performing multi-stage high-frequency frequency selection processing on the received power adjustment signal to obtain a high-frequency signal;

[0042] Performing edge detection on the captured high-frequency signal to obtain a pulse width signal;

[0043] Decoding the pulse width signal to obtain second driving information;

[0044] Controlling a second conduction condition of the input terminal circuit based on second driving information;

[0045] The transformer is controlled to perform power adjustment based on the second conduction condition.

[0046] In the above implementation process, when the control center is set in the input end circuit, multiple devices set in the input end circuit can also perform multi-level high-frequency frequency selection, edge detection, and decoding processing on the power adjustment signal in sequence according to the type of the power adjustment signal to obtain corresponding second drive information, and control the second conduction condition of the input end circuit according to the second drive information, so as to control the transformer to adjust the power according to the second conduction condition of the input end circuit, and the input end circuit can perform rapid and effective control based on the power adjustment signal.

[0047] Optionally, the method further comprises:

[0048] Setting a circuit board to isolate the first magnetic coupling device and the second magnetic coupling device;

[0049] Wherein, the coupling coefficient between the first magnetic coupling device and the second magnetic coupling device is determined according to the interlayer thickness of the circuit board.

[0050] In the above implementation process, in order to reduce the control difficulty of the chip, two magnetic coupling devices can be set in two layers of the circuit board, and the coupling coefficient of the two magnetic coupling devices can be determined and adjusted by the interlayer thickness of the circuit board to achieve better magnetic coupling effect.

[0051] Optionally, the first magnetic coupling device is a first coil in the transformer;

[0052] The second magnetic coupling device is a second coil in the transformer;

[0053] The method further comprises:

[0054] Performing differential operational amplifier processing on the power adjustment signal output by the second coil through the output end circuit;

[0055] The power adjustment signal received by the first coil is subjected to differential operational amplifier processing through the input end circuit.

[0056] In the above implementation process, in order to reduce the device cost of the device, the magnetic coupling device can also be set in the form of a coil in a transformer. Considering the interference in the transformer coil, the power adjustment signal can be processed by differential signal op amps by the input circuit and the output circuit respectively to effectively reduce the interference of the signal.

[0057] In summary, the embodiment of the present application provides a power transmission method, which can transmit power control using a magnetic coupling device as an isolation feedback device, and set the control center in the input circuit connected to the voltage input terminal, so as to control the transformer to transmit and adjust power according to the transmitted power adjustment signal. Effectively reduce the fault conditions caused by aging or failure of the isolation feedback device, and provide users with a stable and efficient charging process. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0059] Figure 1 A schematic diagram of the circuit structure of a first power transmission device provided in an embodiment of the present application;

[0060] Figure 2 A schematic diagram of a power transmission method provided in an embodiment of the present application;

[0061] Figure 3 A schematic diagram of the circuit structure of a second power transmission device provided in an embodiment of the present application;

[0062] Figure 4 A detailed flowchart of step S210 provided in an embodiment of the present application;

[0063] Figure 5 A detailed flow chart of step S212 provided in an embodiment of the present application;

[0064] Figure 6 A schematic diagram of a flow chart of comparing a voltage difference with a preset reference value provided in an embodiment of the present application;

[0065] Figure 7 A schematic diagram of an example transmission waveform of an amplitude shift keying signal provided in the present application;

[0066] Figure 8 A detailed flow chart of step S220 provided in an embodiment of the present application;

[0067] Fig. 9 A schematic diagram of the structure of a bandpass filter provided in an embodiment of the present application;

[0068] Fig.10 A schematic diagram of the circuit structure of a third power transmission device provided in an embodiment of the present application;

[0069] Fig.11 Another detailed flowchart of step S220 provided in an embodiment of the present application;

[0070] Fig.12 A schematic diagram of the structure of a high-pass filter provided in an embodiment of the present application;

[0071] Fig.13 A schematic diagram of the structure of a magnetic coupling coil on a circuit board provided in an embodiment of the present application;

[0072] Fig.14 A schematic diagram of the structure of a magnetic coupling device provided in an embodiment of the present application when it is set as a tapped coil of a transformer to transmit an ASK signal;

[0073] Fig.15 A structural schematic diagram of a magnetic coupling device provided in an embodiment of the present application when it is set as a tapped coil of a transformer to transmit an FSK signal;

[0074] Fig.16 A structural schematic diagram of a magnetic coupling device provided in an embodiment of the present application when it is configured as an outer winding coil of a transformer to transmit an ASK signal;

[0075] Fig.17 A structural schematic diagram of a magnetic coupling device provided in an embodiment of the present application when it is configured as an outer winding coil of a transformer to transmit an FSK signal.

[0076] Icons: 110-input circuit; 120-output circuit; 130-transformer; Vin-voltage input terminal; Vout-voltage output terminal; 111-first magnetic coupling device; 1111-first magnetic coupling coil; 1112-first tapped coil; 1113-first outer winding coil; 121-second magnetic coupling device; 1211-second magnetic coupling coil; 1212-second tapped coil; 1213-second outer winding coil; 140-circuit board; coder-encoder; SR-rectifier circuit; BPF-first bandpass filter; decoder1-first decoder; con1-first controller; driver1-first driver; RS1-first trigger; M1 -first transistor; HPF-second high-pass filter; decoder2-second capture decoder; con2-second controller; driver2-second driver; RS2-second trigger; M2-second transistor; Ri1-first grounding resistor; Ri2-second grounding resistor; Vsns-voltage signal; Vref-reference voltage; Vp-common-phase input voltage; Vn-reverse-phase input voltage; Sin-signal input terminal; Sout-signal output terminal; D-diode; R1-first resistor; R2-second resistor; R3-third resistor; R4-fourth resistor; R5-fifth resistor; C1-first capacitor; C2-second capacitor; C3-third capacitor; C4-fourth capacitor. DETAILED DESCRIPTION

[0077] The technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments of the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the embodiments of the present application.

[0078] Terminal electronic devices usually need batteries or chargers to maintain normal operation. Terminal electronic devices include mobile phones, tablets, PCs, wearable devices and other types of devices. The charging power of various terminal electronic devices ranges from a few W to 300 W. The flyback converter topology usually uses 1 to 2 power MOS and a small number of peripheral devices to achieve power transmission. It has a simple structure and low cost, and is widely used in terminal power adapters.

[0079] When implementing power conversion during charging, optocouplers are currently commonly used as isolated feedback devices in the Flyback architecture. However, in the process of using optocouplers for signal transmission, optocouplers may age and fail in long-term use, causing failures in the terminal power adapter and adversely affecting the charging process of the terminal device.

[0080] In order to solve the above problems, the applicant conducted research and found that in addition to optocouplers, magnetic induction devices can also be used as isolation feedback devices. According to Maxwell's equations, when an alternating current flows through the transmitting coil, an alternating magnetic field will be generated in space. When the receiving coil senses the alternating magnetic field, an induced electromotive force and an induced current are generated, and the magnetic induction device will not cause device aging problems. Therefore, the embodiment of the present application provides a power transmission device to set a magnetic coupling device for signal transmission to reduce failures caused by device aging.

[0081] See also Figure 1 , Figure 1 This is a schematic diagram of the circuit structure of the first power transmission device provided in an embodiment of the present application. The power transmission device may include: an input circuit 110, an output circuit 120, a transformer 130, a voltage input terminal Vin and a voltage output terminal Vout.

[0082] The transformer 130 is connected to the voltage input terminal Vin and the voltage output terminal Vout, and the input terminal circuit 110 is connected to the voltage input terminal and the first magnetic coupling device 111 .

[0083] It should be noted that the output circuit 120 is provided with an encoder and a rectifier circuit SR (Synchronous rectification), the rectifier circuit SR is connected to the voltage output terminal Vout, and the encoder is connected to the second magnetic coupling device 121 .

[0084] The output circuit 120 is used to output the power adjustment signal signal through the second magnetic coupling device 121, and the input circuit 110 is used to receive the power adjustment signal signal through the first magnetic coupling device 111. The input circuit 110 is also used to control the transformer 130 to adjust the power based on the power adjustment signal signal.

[0085] Optionally, the first magnetic coupling device 111 and the second magnetic coupling device 121 can be configured as various types of magnetic induction devices, such as a coil magnetic coupling device on a single board, a dedicated signal magnetic coupling device, or a power sub-conversion channel or other device that transmits magnetic signals.

[0086] See also Figure 2 , Figure 2 A schematic flow chart of a power transmission method provided in an embodiment of the present application, the method may include steps S210-S220.

[0087] Step S210: outputting a power adjustment signal based on the second magnetic coupling device through an output circuit.

[0088] The power adjustment signal signal can be an adjustment signal indicating different power adjustment degrees determined according to the voltage condition of the voltage output terminal. A magnetic coupling device can be used as an isolation feedback device, and a control center is set in the input circuit to modulate the signal so as to transmit the power adjustment signal signal through the magnetic coupling device.

[0089] Step S220: receiving a power adjustment signal based on the first magnetic coupling device through the input circuit, so as to control the transformer to perform power adjustment based on the power adjustment signal.

[0090] The first magnetic coupling device 111 can receive the power adjustment signal signal, and the input circuit 110 can control the transformer 130 to work based on the power adjustment signal signal, so as to achieve power adjustment between the voltage input terminal Vin and the voltage output terminal Vout.

[0091] For example, when a magnetic coupling device is used for signal transmission, the power adjustment signal signal can be a variety of modulation signals such as an amplitude shift keying signal (ASK signal) or a frequency shift keying signal (FSK signal). Amplitude shift keying signal, that is, a signal obtained by ASK (Ask modulation, amplitude shift keying) modulation, can use frequency and phase as constants, amplitude as a variable, and transmit information bits through the amplitude of the carrier. Frequency shift keying signal, that is, a signal obtained by FSK (Frequency-shiftkeying) modulation, is easy to implement, has good anti-noise and anti-attenuation performance, and has been widely used in medium and low-speed data transmission. Compared with other magnetic induction signals, FSK signals have better anti-noise and anti-attenuation performance, and the design requirements for hardware circuits are relatively simple, and can achieve efficient and low-cost signal transmission.

[0092] Optionally, since the power stage switching circuit is between 100kHz and 250kHz and the parasitic oscillation frequency is around 1MHz, these signals may couple to the FSK signal and cause interference. In order to facilitate frequency band filtering, the designed FSK signal frequency can be set above 10MHz. The corresponding FSK signal can be modulated according to the required signal type.

[0093] Optionally, in order to avoid false signal triggering, since an FSK signal is transmitted once in each power cycle (100kHz to 250kHz) for control, the effective FSK signal is at the end of the power cycle, and the FSK signal detection can be set to be valid only in the second half of the cycle.

[0094] exist Figure 2In the embodiment shown, magnetic coupling devices are used instead of optical coupling devices for signal transmission, which can effectively reduce the aging or failure of the isolation feedback device, thereby reducing the charging failure caused by the failure of the isolation feedback device, extending the service life of the power transmission device, optimizing the use effect of the power transmission device, and providing users with a stable and efficient charging process.

[0095] It should be noted that the control center of the power transmission device is set in the input circuit 110. In order to achieve the control effect, please refer to Figure 3 , Figure 3 A schematic diagram of the circuit structure of a second power transmission device provided in an embodiment of the present application, wherein the encoder coder is connected to the reference voltage Vref. The encoder coder is used to digitally encode the output voltage signal in the voltage output terminal Vout, the reference voltage signal in the reference voltage Vref, and the signal characteristic information to obtain a power adjustment signal signal, and transmit the power adjustment signal signal to the first magnetic coupling device 111 through the second magnetic coupling device 121.

[0096] See also Figure 4 , Figure 4 A detailed flow chart of step S210 is provided for an embodiment of the present application. Step S210 may also include steps S211-S213.

[0097] Step S211, obtaining an output voltage signal of a voltage output terminal connected to the rectifier circuit and a reference voltage signal of a reference voltage connected to the encoder.

[0098] The encoder coder may obtain an output voltage signal of a voltage output terminal Vout connected to the rectifier circuit SR, which is recorded as Vout1 , and a reference voltage signal of a reference voltage Vref, which is recorded as Vref1 .

[0099] Step S212: digitally encode the output voltage signal and the reference voltage signal to obtain a power adjustment signal.

[0100] The encoder may compare Vout1 and Vref1 and perform digital encoding to obtain power adjustment signals with different power adjustment degrees.

[0101] Step S213: transmitting a power adjustment signal to the first magnetic coupling device through the second magnetic coupling device.

[0102] Among them, the encoder coder can send the power adjustment signal signal to the second magnetic coupling device 121, so that the second magnetic coupling device 121 sends the power adjustment signal signal to the first magnetic coupling device 111, so as to realize data transmission between the input circuit 110 and the output circuit 120, so that the input circuit 110 can control power adjustment.

[0103] exist Figure 4 In the illustrated embodiment, a power adjustment signal signal can be generated to perform power control, thereby improving data transmission efficiency and control efficiency.

[0104] See also Figure 5 , Figure 5 A detailed flow chart of step S212 is provided for an embodiment of the present application. Step S212 may also include steps S2121-S2124.

[0105] Step S2121, determining a voltage difference according to the output voltage signal and the reference voltage signal.

[0106] When digital encoding is performed, the output voltage signal and the reference voltage signal may be compared to calculate a voltage difference between the output voltage signal and the reference voltage signal, where the voltage difference Verr=Vout1-Vref1.

[0107] Step S2122, comparing the voltage difference with a preset reference value to obtain a plurality of comparison results representing a plurality of power adjustment degrees.

[0108] In order to determine the voltage condition represented by the voltage difference and understand the current power condition, a corresponding preset reference value can be pre-set to represent different power conditions, thereby comparing the voltage difference with the preset reference value to determine a comparison result representing different power adjustment degrees.

[0109] Optionally, the preset reference value may include a first reference value, denoted as a, and a second reference value, denoted as A. The preset reference value may be determined by: determining an output voltage requirement and a response regulation requirement of the power transmission device; determining the first reference value based on the output voltage requirement; determining the second reference value based on the response regulation requirement and the first reference value. Multiple corresponding preset reference values ​​may be determined according to the output voltage requirement and the corresponding regulation requirement of the power transmission device to determine the degree of power adjustment according to a variety of different actual situations.

[0110] For example, the value of a can meet the requirements of the output voltage and current step. If the product requires the output voltage step to be less than 25mV, then a is 25mV. The value of A is set to quickly respond to the regulation requirements and can be 10 to 30 times a.

[0111] It should be noted that if the comparison result shows that the voltage difference is less than 0 and greater than the negative value of the first reference value, that is, -a < Verr1 < 0, the power adjustment degree is to reduce the output power of the first ratio, that is, slightly reduce the power; if the comparison result shows that the voltage difference is less than or equal to the negative value of the first reference value and greater than the negative value of the second reference value, that is, -A < Verr1 ≤ -a, the power adjustment degree is to reduce the output power of the second ratio, that is, greatly reduce the power. The second ratio is greater than the first ratio, and both can be set and modified according to the actual situation and requirements.

[0112] If the comparison result shows that the voltage difference is greater than or equal to 0 and less than the first reference value, that is, 0 ≤ Verr1 < a, the power adjustment degree is to increase the output power of the third ratio, that is, slightly increase the power; if the comparison result shows that the voltage difference is greater than or equal to the first reference value, that is, Verr1 ≥ a, the power adjustment degree is to increase the output power of the fourth ratio, that is, greatly increase the power. The fourth ratio is greater than the third ratio, and both can be set and modified according to the actual situation and requirements.

[0113] If the comparison result shows that the voltage difference is less than or equal to the negative value of the second reference value, that is, Verr1 ≤ -A, the power adjustment degree is to turn off the output power.

[0114] Through the above comparison method, multiple corresponding reference values can be determined according to the actual requirements of the output voltage, and multiple different numerical intervals can be formed based on the multiple reference values and the negative values of the multiple reference values, so as to determine the corresponding comparison results according to the numerical intervals of the voltage difference, and to meet the various requirements of voltage demand and rapid response according to different comparison results.

[0115] Step S2123, determine the bit information according to the signal characteristic information.

[0116] It should be noted that due to the different types of the power adjustment signal signal, the corresponding signal characteristic information is also different. For example, if the power adjustment signal signal is an amplitude shift keying signal, the corresponding signal characteristic information is waveform information; if the power adjustment signal signal is a frequency shift keying signal, the corresponding signal characteristic information is pulse width information.

[0117] For example, the waveform information may include: the carrier frequency of the ASK signal is 5 MHz or higher, the period is 200 ns, the signal flips 2 times within 200 ns for digital 1, and the signal flips 1 time within 200 ns for digital 0, so as to determine the corresponding digital bit information according to the flipping situation of the waveform. The pulse width information may include the information with the pulse width bit being D and the information with the pulse width bit being D / 2. The bit information may be the corresponding data bit coding value. For example, the bit information with the pulse width bit being D can be set to 0, and the bit information with the pulse width bit being D / 2 can be set to 1.

[0118] Step S2124: digitally encode the comparison result and the bit information to obtain a power adjustment signal.

[0119] When digital bit encoding is performed to generate an amplitude shift keying signal, the beginning can be set to a 2-bit synchronization bit 0x11, and the data uses 3 bits to encode the signal, and there is also a 1-bit parity bit to form a complete amplitude shift keying signal. When digital bit encoding is performed to generate a frequency shift keying signal, the beginning can also be set to a 2-bit synchronization bit 0x11, combined with the corresponding three-bit data bit encoding value and a 1-bit parity bit to form a complete frequency shift keying signal.

[0120] Optionally, see Figure 6 , Figure 6 A schematic diagram of a flow chart for comparing a voltage difference with a preset reference value provided in an embodiment of the present application, the power adjustment signal signal may include count+ (slightly increase power), count++ (significantly increase power), count- (slightly reduce power), count-- (significantly reduce power), shut down (turn off output), etc. For example, in the power adjustment signal signal, when the data encoding value is 001, it is characterized as a count+ signal, when the data encoding value is 010, it is characterized as a count++ signal, when the data encoding value is 011, it is characterized as a count- signal, when the data encoding value is 100, it is characterized as a count- signal, and when the data is 101, it is characterized as a shut down signal.

[0121] It should be noted that, unlike the traditional digital signal closed-loop control that transmits a 128-level control error signal every 50ms (2kHz), this application transmits a 2-level control error signal in each PWM cycle (about 150kHz), and the system response time is similar. It should be noted that count- and count+ need to meet the minimum step requirements of the output voltage and current, so count-- and count++ are used for fast response. Please refer to Figure 7 , Figure 7 A schematic diagram of an example transmission waveform of an amplitude shift keying signal provided in the present application, the waveform can represent a digital signal 110110, wherein 11 is a synchronization bit, the signal corresponding to the data coding value 011 is a count-signal, and 0 is a parity check bit.

[0122] exist Figure 5 In the illustrated embodiment, digital encoding can be performed correspondingly according to the comparison result and the bit information to obtain a power adjustment signal signal representing different power adjustment degrees.

[0123] Optionally, by Figure 3It can be seen that when the control center is set in the input circuit 110, the input circuit 110 may be provided with a first bandpass filter BPF, a first decoder decoder1, a first controller con1, a first trigger RS1, a first driver driver1 and a first transistor M1.

[0124] Optionally, the first transistor M1 may be connected to a corresponding first grounding resistor Ri1 for grounding to operate normally.

[0125] The first bandpass filter BPF is connected to the first decoder decoder1 and the first magnetic coupling device 111, the first decoder decoder1 is connected to the first controller con1, the first controller con1 is connected to the first trigger RS1 and the first transistor M1, the first driver driver1 is connected to the first trigger RS1 and the first transistor M1, and the first transistor M1 is connected to the transformer 130. The first bandpass filter BPF is used to perform frequency selection processing on the received power adjustment signal signal to obtain a frequency selection signal; the first decoder decoder1 is used to decode the frequency selection signal to obtain first driving information; the first controller con1 is used to control the first trigger RS1 to output a high level or a low level based on the first driving information; the first driver driver1 is used to turn on the first transistor M1 based on a high level, and the first driver driver1 is also used to turn off the first transistor M1 based on a low level; the transformer 130 is used to adjust the power based on the first conduction condition of the first transistor M1.

[0126] See also Figure 8 , Figure 8 A detailed flow chart of step S220 is provided for an embodiment of the present application. Step S220 may also include steps S2201-S2204.

[0127] Step S2201, performing frequency selection processing on the received power adjustment signal to obtain a frequency selected signal.

[0128] When the power adjustment signal signal is an amplitude shift keying signal, the power adjustment signal signal may be filtered by the first bandpass filter BPF provided in the input circuit 110 to perform frequency selection processing to obtain a corresponding frequency selected signal.

[0129] Optionally, see Fig. 9 , Fig. 9A schematic diagram of the structure of a bandpass filter provided in an embodiment of the present application, wherein a diode D is used for a forward waveform input through a signal input terminal Sin, a first resistor R1 and a first capacitor C1 form a low-pass filter, a third resistor R3 and a second capacitor C2 form a high-pass filter, and a second resistor R2 is used to discharge the voltage of the first capacitor C1 to prevent saturation of the low-pass filter, and output the signal to the signal output terminal Sout through two filterings. The cutoff frequency fc_H of the high-pass filter can be lower than the cutoff frequency fc_L of the low-pass filter, and the two filters are connected in series to form a bandpass filter to cover the required frequency band signal.

[0130] Step S2202: decode the frequency-selected signal to obtain first driving information.

[0131] Among them, since the power adjustment signal signal is encoded, the first decoder decoder1 can decode the frequency selection signal to obtain initial information, and obtain Set and Reset signals based on the initial signal and the voltage signal Vsns in the first transistor M1 as the first driving information for driving the first trigger RS1.

[0132] Step S2203: controlling a first conduction condition of the input end circuit based on the first driving information.

[0133] Among them, the first controller con1 controls the output level of the first trigger RS1 according to the Set and Reset signals in the first driving information, and the first driver driver1 switches the first transistor M1 according to the output level, thereby determining the first conduction condition of the input circuit 110 according to the first conduction condition of the first transistor M1.

[0134] It should be noted that the first controller con1 is a Set and Reset controller.

[0135] Step S2204: Control the transformer to adjust power based on the first conduction condition.

[0136] The transformer 130 can be controlled to adjust the power according to the first conduction condition of the input circuit 110 , and the input circuit 110 can quickly and effectively control the power adjustment.

[0137] exist Figure 8 In the illustrated embodiment, the transformer 130 is controlled by the first conduction condition of the input circuit 110 to implement a corresponding power adjustment function.

[0138] It should be noted that Figure 3 A schematic diagram of a structure when the power adjustment signal signal is an amplitude shift keying signal is shown in FIG. Fig.10 , Fig.10 This is a schematic diagram of the circuit structure of the third power transmission device provided in the embodiment of the present application, which illustrates the structure of the input circuit 110 when the power adjustment signal signal is a frequency shift keying signal. The input circuit 110 may also be provided with a second high-pass filter HPF, a second capture decoder decoder2 (capture decoder), a second controller con2, a second trigger RS2, a second driver driver2 and a second transistor M2.

[0139] The second high-pass filter HPF is connected to the second capture decoder decoder2 and the first magnetic coupling device 111, the second capture decoder decoder2 is connected to the second controller con2, the second controller con2 is connected to the second trigger RS2 and the second transistor M2, the second driver driver2 is connected to the second trigger RS2 and the second transistor M2, and the second transistor M2 is connected to the transformer 130. The second high-pass filter HPF is used to perform multi-stage high-frequency frequency selection processing on the received power adjustment signal signal to obtain a high-frequency signal; the second capture decoder decoder2 is used to perform edge detection on the captured high-frequency signal to obtain a pulse width signal, and decode the pulse width signal to obtain second driving information; the second controller con2 is used to control the second trigger RS2 to output a high level based on the second driving information; the second driver driver2 is used to turn on the second transistor M2 based on the high level; the transformer 130 is used to adjust the power based on the second conduction condition of the second transistor M2.

[0140] Optionally, the second transistor M2 may be connected to a corresponding second grounding resistor Ri2 for grounding to operate normally.

[0141] See also Fig.11 , Fig.11 Another detailed flowchart of step S220 provided in an embodiment of the present application, step S220 may also include steps S2205-S2209.

[0142] Step S2205, performing multi-stage high frequency frequency selection processing on the received power adjustment signal to obtain a high frequency signal.

[0143] When the power adjustment signal signal is a frequency shift keying signal, the second high pass filter HPF provided in the input circuit 110 may filter the power adjustment signal signal to perform multi-stage high frequency selection processing to obtain a corresponding high frequency signal.

[0144] Optionally, see Fig.12 , Fig.12A structural schematic diagram of a high-pass filter provided in an embodiment of the present application. Since there are mixed signals of multiple frequency bands on the primary side, high-pass filtering is required before capture, wherein the positive waveform input through the signal input terminal Sin, the fourth resistor R4 and the third capacitor C3 form a low-pass filter, the fifth resistor R5 and the fourth capacitor C4 form a high-pass filter, and the two filters are connected in series to form a high-pass filter, so that the signal is output to the signal output terminal Sout according to two high-pass filtering, covering the required frequency band signal.

[0145] Step S2206, performing edge detection on the captured high-frequency signal to obtain a pulse width signal.

[0146] Step S2207, decoding the pulse width signal to obtain second driving information.

[0147] The second capture decoder decoder2 can detect the edge change of the high-frequency signal through an analog circuit internally (needed to be within a predetermined dv / dt), combined with the high-frequency clock counting edge or the analog circuit identification window, so as to obtain signals with different pulse widths as pulse width signals. In addition, since the power adjustment signal signal is encoded, the second capture decoder decoder2 can continue to decode the high-frequency signal to obtain the second driving information for driving the second trigger RS2.

[0148] Step S2208, controlling a second conduction condition of the input circuit based on the second driving information.

[0149] Among them, the second controller con2 controls the second trigger RS2 to output a high level according to the Set signal in the second driving information, and the second driver driver2 turns on the second transistor M2 according to the high level, thereby determining the second conduction condition of the input circuit 110 according to the conduction condition of the second transistor M2.

[0150] It should be noted that, since the second driving information only includes the set signal of the corresponding control, correspondingly, the second controller con2 is a set controller.

[0151] Step S2209: Control the transformer to adjust power based on the second conduction condition.

[0152] The transformer 130 can be controlled to adjust the power according to the second conduction condition of the input circuit 110 , and the input circuit 110 can quickly and effectively control the power adjustment.

[0153] exist Fig.11 In the illustrated embodiment, the transformer 130 is controlled by the second conduction condition of the input circuit 110 to achieve a corresponding power adjustment function.

[0154] Optionally, to reduce the difficulty of controlling the chip, two magnetic coupling devices can be set in two layers of the circuit board, see Fig.13 , Fig.13 A schematic diagram of a structure of a magnetic coupling coil on a circuit board provided in an embodiment of the present application, wherein the first magnetic coupling device 111 may include a first magnetic coupling coil 1111; the second magnetic coupling device 121 may include a second magnetic coupling coil 1211. The first magnetic coupling coil 1111 is arranged on the first layer of the circuit board 140; the second magnetic coupling coil 1211 is arranged on the second layer of the circuit board 140; the first magnetic circuit of the first magnetic coupling coil 1111 and the second magnetic coupling coil 1211 is at a vertical angle to the second magnetic circuit of the transformer 130; the coupling coefficient of the first magnetic coupling device 111 and the second magnetic coupling device 121 is determined according to the interlayer thickness of the circuit board.

[0155] Optionally, the circuit board 140 can be a PCB board, and two coils can be respectively set on the upper and lower layers of the PCB board as magnetic coupling devices. The coupling coefficient of the two magnetic coupling devices can be determined and adjusted by the interlayer thickness of the circuit board to achieve a better magnetic coupling effect. Since the interlayer thickness will affect the coupling coefficient of the two coils, the smaller the thickness, the better the coupling coefficient. Therefore, the interlayer thickness can be set to 0.4mm~1.2mm according to actual conditions and processes. The upper and lower coils can also use multiple turns in series to increase the self-inductance, and the vias between the primary and secondary sides can be set to be more than 6mm apart on the same plane to meet safety requirements. In actual board-level layout, the magnetic circuit of the magnetic coupling coil on the PCB board can be set to be perpendicular to the magnetic circuit of the transformer 130 to effectively reduce the interference of the power circuit on the magnetic coupling coil of the PCB board.

[0156] Optionally, in order to reduce the device cost of the apparatus, the magnetic coupling device can also be set as a coil in the transformer 130. The first magnetic coupling device 111 can also include a first coil of the transformer 130; the second magnetic coupling device 121 can also include a second coil of the transformer 130. The input end circuit 110 is used to perform differential operational amplifier processing on the power adjustment signal received by the first coil; the output end circuit 120 is used to perform differential operational amplifier processing on the power adjustment signal output by the second coil.

[0157] For example, see Figure 14-15 , Fig.14 A schematic diagram of the structure of a magnetic coupling device provided in an embodiment of the present application when it is set as a tapped coil of a transformer to transmit an ASK signal. Fig.15 A schematic diagram of the structure of a magnetic coupling device provided in an embodiment of the present application when it is set as a tapped coil of a transformer to transmit an FSK signal. Figure 14-15In the embodiment, the coil of the middle tap of the transformer 130 can be used as the first magnetic coupling device 111 and the second magnetic coupling device 121 , the first coil can include a first tapped coil 1112 , and the second coil can include a second tapped coil 1212 .

[0158] For example, see Figure 16-Figure 17 , Fig.16 A schematic diagram of a structure in which a magnetic coupling device provided in an embodiment of the present application is set as an outer winding coil of a transformer to transmit an ASK signal. Fig.17 A structural diagram of a magnetic coupling device provided in an embodiment of the present application when it is set as an outer winding coil of a transformer to transmit an FSK signal. Figure 16-Figure 17 In the embodiment, coils formed by winding several turns of the transformer 130 can be used as the first magnetic coupling device 111 and the second magnetic coupling device 121 . The first coil can include a first outer winding coil 1113 , and the second coil can include a second outer winding coil 1213 .

[0159] It should be noted that the power adjustment signal signal received by the first magnetic coupling device 111 can be differentially processed by an operational amplifier based on the input circuit 110; the power adjustment signal signal output by the second magnetic coupling device 121 can be differentially processed by an operational amplifier based on the output circuit 120. For example, the differential signal is injected by the encoder coder in the output circuit 120, and the differential signal is input by the first bandpass filter BPF or the second high-pass filter HPF in the input circuit 110, and both input signals are floating. Although the signal as a whole follows the jitter of the in-phase input voltage Vp of the transformer 130, the in-phase input voltage Vp will have a large fluctuation, the first jitter is more than ten MHz, and the second jitter is about 1MHz. When modulating the signal, the first jitter period can be actively avoided to reduce spatial magnetic field interference. A preset time can also be set for delay (Delay) for control. In addition, by differential operational amplifier processing so that the voltage of the input signal is the in-phase input voltage Vp-the inverting input voltage Vn, the interference caused can be effectively reduced. When the power transformer 130 magnetically couples the signal to be transmitted through a coil with several turns wound around it, since the signal reference ground follows the power ground of each primary and secondary side, only bandpass filtering is required on the primary side to obtain a valid signal, thus eliminating the need for a high-bandwidth, high-common-mode voltage-resistant differential op amp, and reducing costs and design difficulty.

[0160] In addition, the various parts in the various embodiments of the present application can be integrated together to form an independent part, or the various parts can exist separately, or two or more parts can be integrated to form an independent part.

[0161] The above description is only an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0162] The above description is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application.

[0163] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the existence of other identical elements in the process, article or device including the elements.

[0164] In several embodiments provided in the present application, it should be understood that the disclosed device can also be implemented in other ways. The device embodiments described above are merely schematic, for example, the block diagrams in the accompanying drawings show the possible architecture, functions and operations of the devices according to the multiple embodiments of the present application. In this regard, each box in the block diagram can represent a module, a program segment or a part of a code, and the module, a program segment or a part of the code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram, and the combination of the block diagrams, can be implemented with a dedicated hardware-based system that performs a specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

Claims

1. A power transmission method, characterized in that: The method is applied to a power transmission device, which includes: an input circuit, an output circuit, a transformer, a voltage input terminal and a voltage output terminal; the transformer connects the voltage input terminal and the voltage output terminal; the input circuit connects the voltage input terminal and a first magnetic coupling device; the output circuit connects the voltage output terminal and a second magnetic coupling device; the method includes: Outputting a power adjustment signal based on the second magnetic coupling device through the output end circuit; wherein the power adjustment signal is an adjustment signal representing different power adjustment degrees determined according to the voltage condition of the voltage output end; The power adjustment signal is received through the input circuit based on the first magnetic coupling device, so as to control the transformer to perform power adjustment based on the power adjustment signal.

2. The method according to claim 1, characterized in that in, The power adjustment signal includes an amplitude shift keying signal or a frequency shift keying signal.

3. The method according to claim 1, characterized in that in, The outputting a power adjustment signal based on the second magnetic coupling device through the output end circuit includes: Acquire an output voltage signal of the voltage output terminal connected to the rectifier circuit and a reference voltage signal of the reference voltage connected to the encoder; Performing digital encoding based on the output voltage signal and the reference voltage signal to obtain the power adjustment signal; The power adjustment signal is transmitted to the first magnetic coupling device through the second magnetic coupling device.

4. The method according to claim 3, characterized in that The step of performing digital encoding based on the output voltage signal and the reference voltage signal to obtain the power adjustment signal comprises: determining a voltage difference according to the output voltage signal and the reference voltage signal; Comparing the voltage difference with a preset reference value to obtain a plurality of comparison results representing a plurality of power adjustment degrees; Determining bit information according to signal characteristic information; Digital encoding is performed based on the comparison result and the bit information to obtain the power adjustment signal.

5. The method according to claim 4, characterized in that The preset reference value includes a first reference value and a second reference value; the preset reference value is determined by: determining an output voltage requirement and a response regulation requirement of the power transmission device; determining the first reference value based on an output voltage requirement; The second reference value is determined based on the response adjustment requirement and the first reference value.

6. The method according to claim 5, characterized in that The voltage difference is compared with a preset reference value to obtain multiple comparison results representing multiple power adjustment degrees, including: If the comparison result is that the voltage difference is less than 0 and greater than the negative value of the first reference value, the power adjustment degree is to reduce the output power of the first ratio; If the comparison result is that the voltage difference is less than or equal to the negative value of the first reference value and greater than the negative value of the second reference value, the power adjustment degree is to reduce the output power of the second ratio, and the second ratio is greater than the first ratio; If the comparison result is that the voltage difference is greater than or equal to 0 and less than the first reference value, the power adjustment degree is to increase the output power by a third ratio; If the comparison result is that the voltage difference is greater than or equal to the first reference value, the power adjustment degree is to increase the output power by a fourth ratio, and the fourth ratio is greater than the third ratio; If the comparison result is that the voltage difference is less than or equal to the negative value of the second reference value, the power adjustment level is to turn off the output power.

7. The method according to claim 1, characterized in that The receiving the power adjustment signal based on the first magnetic coupling device through the input end circuit to control the transformer to adjust the power based on the power adjustment signal includes: Performing frequency selection processing on the received power adjustment signal to obtain a frequency selected signal; Decoding the frequency-selected signal to obtain first driving information; Controlling a first conduction condition of the input terminal circuit based on the first driving information; The transformer is controlled to perform power adjustment based on the first conduction condition.

8. The method according to claim 1, characterized in that: The receiving the power adjustment signal based on the first magnetic coupling device through the input end circuit to control the transformer to adjust the power based on the power adjustment signal includes: Performing multi-stage high-frequency frequency selection processing on the received power adjustment signal to obtain a high-frequency signal; Performing edge detection on the captured high-frequency signal to obtain a pulse width signal; Decoding the pulse width signal to obtain second driving information; Controlling a second conduction condition of the input terminal circuit based on second driving information; The transformer is controlled to perform power adjustment based on the second conduction condition.

9. The method according to any one of claims 1 to 8, characterized in that The method further comprises: Setting a circuit board to isolate the first magnetic coupling device and the second magnetic coupling device; Wherein, the coupling coefficient between the first magnetic coupling device and the second magnetic coupling device is determined according to the interlayer thickness of the circuit board.

10. The method according to any one of claims 1 to 8, characterized in that in, The first magnetic coupling device is a first coil in the transformer; The second magnetic coupling device is a second coil in the transformer; The method further comprises: Performing differential operational amplifier processing on the power adjustment signal output by the second coil through the output end circuit; The power adjustment signal received by the first coil is subjected to differential operational amplifier processing through the input end circuit.

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