CN202034798U - Portable wireless charging device - Google Patents

Abstract

The utility model relates to a portable wireless charging device, including power module, and power module passes through frequency conversion and drive power adjustment output electromagnetic wave energy to handheld device's power receiving module, the power supply microprocessor who utilizes power module can receive external power supply unit, the not equidimension voltage power that power receiving arrangement inputed, when the high-voltage electric power of commercial power reaches the small voltage supply source of solar cell, all can reach and convert the power supply that power receiving module used, the convenience of wireless charging of collocation, can let the power supply time of handheld device when the action of power receiving end make the extension.

Description

Portable Wireless Charging Device

technical field

The utility model relates to a portable wireless charging device, in particular to a power supply module that can receive power supplies of different voltages and convert them into power supplies used by power receiving modules. the

Background technique

In today's era of electronic technology and the ubiquity of the Internet, various digital products are flooding our lives, such as digital cameras, mobile phones, multimedia audio-visual players (MP3 or MP4, MP5 players) and other video or audio handhelds. Electronic devices, and handheld electronic devices are all designed towards the concept of lightness, thinness, shortness, smallness, intelligence and multi-function. the

However, if a handheld electronic device (such as a mobile phone) is to be carried around, it must first solve the problem of power depletion. Generally, the mobile phone can be used continuously by replacing the battery with a new one. However, the specifications of mobile phones of each brand are not exhaustive Similarly, some mobile phones have a built-in battery that cannot be replaced. When charging, you must use a charging stand to connect to an external mains socket for charging, or use a power cord to directly connect to a computer for charging. In addition, you can also buy external batteries. However, when the mobile phone is connected to the charging stand or charged with a USB power cord, it must be limited to indoor use. If it is outdoors, it will be due to computers without mains jacks or USB jacks. For connection, the charging stand and power cord cannot be used for charging. In order to solve the problem of external battery devices or energy harvesting devices used for outdoor charging, it is necessary to increase the weight of the carry-on and purchase additional costs, and because the external battery device has other The volume is large, and the overall volume of the combined mobile phone becomes quite large, and it is difficult to hold the mobile phone for operation while charging. However, due to the large volume of the general energy harvesting device, it cannot be integrated with the mobile phone, and a connection line must be used. To connect, so that when the mobile phone goes out, it is necessary to store the external battery device, energy harvesting device and connection line with a backpack with a large storage space, resulting in insufficient convenience in use. the

Furthermore, there are wireless power supply devices that use electromagnetic wave induction to transmit power for wireless charging of handheld electronic devices. Alignment, fixed power supply energy cannot be adjusted according to the corresponding distance of the coil and load conditions, the overall wireless power supply transmission efficiency is poor, and the coil at the power receiving end receives a large voltage value by induction, and the DC step-down integrated circuit component (DC-DC Step -Down IC) reduces the voltage to the target voltage value. Since the step-down action is also completed by switching, energy loss, interference noise and heat generation will occur during the switching process. the

This makes this existing wireless power supply device unable to receive different input voltages (such as receiving natural energy such as tiny solar energy, large power supply sources such as mains power), and can only be limited to receiving a single voltage source, and its applicability is slightly insufficient. Therefore, how to Solving the many problems that exist at present is the direction that the designers of the utility model and those engaged in this industry want to improve urgently. the

Contents of the invention

Based on the consideration of the above-mentioned many shortcomings, the designer made an in-depth analysis and discussion on the characteristics of the wireless charging device, and after various evaluations and considerations, and through painstaking research and development, and then with persistent trial production and modification, he began to design. A utility model patent for this portable wireless charging device. the

The main purpose of this utility model is that the power supply module of the wireless charging device outputs electromagnetic wave energy to the power receiving module through frequency conversion and drive power adjustment, and the power supply microprocessor of the power supply module can receive different voltages input by an external power supply unit or a power receiving device The power supply can be converted into the power supply used by the power receiving module. With the convenience of wireless charging, the power supply time of the handheld device at the power receiving end can be extended when moving. the

The secondary purpose of the utility model is that the power supply microprocessor of the power supply module can safely and efficiently perform wireless power supply through software program operation, and the power supply microprocessor can output pulse width modulation signals to the first drive circuit, the second The drive circuit, and through the software program to check the power output status of the power supply resonant circuit for frequency conversion adjustment, the output power can be quickly and accurately controlled within the range required by the system, and multi-point voltage and temperature monitoring can also be carried out. the

In order to achieve the above object, the portable wireless charging device of the present utility model includes a power supply module, and the power supply microprocessor provided by the power supply module has a built-in software program and a memory, and the power supply microprocessor is electrically connected to a device capable of receiving The power supply circuit of the external power supply, the power supply microprocessor is connected in parallel with the first drive circuit and the second drive circuit capable of supplying power from the power supply circuit, and the first drive circuit and the second drive circuit are respectively provided with two or more parallel MOSFET arrays , the first driving circuit is electrically connected with a power supply resonant circuit having a capacitor array, the power supply resonant circuit is electrically connected with a power supply coil array capable of transmitting power supply energy to the power receiving module from the power supply of the second drive circuit, and the power supply coil array is electrically A signal sampling circuit is connected, and the signal sampling circuit is connected in parallel with a data analysis circuit and a voltage detection circuit connected to a power supply microprocessor, wherein:

The power supply circuit of the power supply module has an external power supply unit and a power receiving device that input different voltages, and the power receiving device is connected with a collection circuit, and the collection circuit stores the power in the storage battery through the connected charging control circuit, and the power supply microprocessor passes The voltage detection circuit connected to it detects the external power supply unit and the storage battery of the system source voltage, and the power supply microprocessor is connected in parallel with the first power switch circuit, the second power switch circuit and the third power switch circuit for power configuration switching, wherein the first A power switch circuit is used to receive the power from the external power supply unit and transmit it to the charging control circuit; the second power switch circuit is used to receive the power from the external power supply unit and transmit it to the power supply module; the third power switch circuit is used to receive the power from the battery and transmit it to the power supply module. to the power supply module. the

Preferably, the external power supply unit of the power supply module is connected to the input power supply with a Universal Serial Bus (USB, Universal Serial BUS), an AC-to-DC transformer or a mains plug. the

Preferably, the power receiving device of the power supply module receives solar energy, kinetic energy or thermal energy collector external tiny energy source and stores DC power uninterruptedly to the storage battery. the

Preferably, the power supply microprocessor of the power supply module is electrically connected with a temperature detection module capable of checking the operating temperatures of the first drive circuit, the second drive circuit and the power supply coil array. the

Utilizing the power supply microprocessor of the power supply module of the present utility model, it can receive the input voltage power supply of different sizes from the external power supply unit and the power receiving device. The power supply used by the power receiving module, combined with the convenience of wireless charging, can extend the power supply time of the handheld device at the power receiving end when it is moving. the

Description of drawings

Fig. 1 is the block diagram of the utility model power supply module;

Fig. 2 is the block diagram of the power receiving module of the present utility model;

Fig. 3 is the block diagram of the power supply circuit of the utility model power supply module;

Fig. 4 is a schematic diagram of the variation of resonance frequency and amplitude of the present invention. the

Explanation of reference signs: 1-power supply module; 11-power supply microprocessor; 12-power supply circuit; 121-external power supply unit; 122-power receiving device; 123-collection circuit; 124-charging control circuit; -voltage detection circuit; 127-first power switch circuit; 128-second power switch circuit; 129-third power switch circuit; 13-first drive circuit; 131-MOSFET array; 132-MOSFET array; 133-MOSFET array ;14-the second driving circuit; 141-MOSFET array; 142-MOSFET array; 143-MOSFET array; 15-power supply resonant circuit; 151-capacitor array; 152-power supply coil array; Circuit; 17-voltage detection circuit; 18-temperature detection module; 2-power receiving module; 21-power receiving microprocessor; 22-power receiving resonant circuit; 221-power receiving coil array; 222-main resonance capacitor; 223- Sub-resonance capacitor; 224-low power regulator; 23-synchronous rectifier; 24-filter circuit; 241-high frequency filter capacitor; 242-first power switch; 243-low frequency filter capacitor; 244-second power switch; 25 - the output part of the receiving end; 26 - the voltage detection circuit; 27 - the signal modulation circuit; 28 - the temperature detection module. the

Detailed ways

In order to achieve the above-mentioned purpose and effect, the technical means and structure adopted by the utility model are hereby drawn with accompanying drawings to illustrate in detail the features and functions of the preferred embodiments of the utility model as follows, in order to fully understand. the

Please refer to Fig. 1 and Fig. 2, which are the block diagram of the power supply module and the block diagram of the power receiving module of the present invention. It can be clearly seen from the figure that the present utility model includes a power supply module 1 and a power receiving module 2, wherein:

The power supply module 1 is provided with a power supply microprocessor 11, and related software programs and memory such as operating programs and control programs are built in the power supply microprocessor 11, and the power supply microprocessor 11 is electrically connected to a power circuit for supplying power 12, and the power supply microprocessor 11 is connected in parallel with a first drive circuit 13 and a second drive circuit 14 that can be powered by the power supply circuit 12, and its first drive circuit 13 is provided with two or more parallel MOSFET arrays 131, 132 , 133, the second drive circuit 14 is also provided with two or more parallel MOSFET arrays 141, 142, 143, and then the first drive circuit 13 is electrically connected to the power supply resonant circuit 15 with a capacitor array 151; in addition, The power supply resonant circuit 15 is electrically connected with a power supply coil array 152 that can be powered by the second drive circuit 14 to emit power supply energy, and the power supply coil array 152 is electrically connected with a signal sampling circuit 16, and the signal sampling circuit 16 is connected in parallel with the power supply microprocessor. The data analysis circuit 161 and the voltage detection circuit 17 of the device 11; in addition, the power supply microprocessor 11 is electrically connected to a temperature detection module 18 that can check the operating temperature of the first drive circuit 13, the second drive circuit 14 and the power supply coil array 152. the

The power receiving module 2 is provided with a power receiving microprocessor 21, and related software programs and memory such as operating programs and control programs are built in the power receiving microprocessor 21, and the power receiving microprocessor 21 is electrically connected to a The power receiving coil array 221 receives the power receiving resonant circuit 22 of the power supply energy, wherein the power receiving coil array 221 is connected in parallel with a main resonant capacitor 222 and a sub-resonant capacitor 223, and the main resonant capacitor 222 is electrically connected to a synchronous rectifier 23, and the sub-resonant The capacitor 223 is electrically connected to a low-power voltage regulator 224 that can supply low-voltage power to the powered microprocessor 21 and the synchronous rectifier 23; in addition, the synchronous rectifier 23 is electrically connected to the filter circuit 24, and the filter circuit 24 is provided in sequence. The high-frequency filter capacitor 241, the first power switch 242, the low-frequency filter capacitor 243, and the second power switch 244 that can output DC power to the output part 25 of the receiving end, and the high-frequency filter capacitor 241 and the low-frequency filter capacitor 243 are electrically connected There is a voltage detection circuit 26 that can check the voltage signal and transmit it to the power receiving microprocessor 21, and after the power receiving microprocessor 21 checks the voltage status of the voltage detection circuit 26, it drives the first power switch 242 and the second power switch 244 Turn on the power supply to output DC power through the high-frequency filter capacitor 241 or the low-frequency filter capacitor 243; in addition, the power receiving microprocessor 21 is electrically connected to receive its encoded signal and transmit the data signal to the power supply module 1 by the power receiving coil array 221 The signal modulation circuit 27 for judging the power output, and the power receiving microprocessor 21 is electrically connected with a temperature detection module 28 that can check the operating temperature of the filter circuit 24 and the power receiving coil array 221 . the

Please refer to Fig. 3, which is a block diagram of the power supply circuit of the power supply module of the present utility model. It can be clearly seen from the figure that the power supply circuit 12 of the power supply module 1 of the present utility model is connected with an external power supply unit 121 for inputting different voltages, and In addition, there is a power receiving device 122 that receives an external power source, and the power receiving device 122 is connected to a collection circuit 123. Since the energy is too small to directly drive the wireless charging device, the energy collected by the collection circuit 123 is stored by the connected charging control circuit 124. into the storage battery 125, and prevent overcharging, over-discharging and backlash damage to the power receiving device 122, and the power supply microprocessor 11 detects the status of the external power supply unit 121 and the storage battery 125 of the system source voltage through the connected voltage detection circuit 126, and uses To judge the operation mode, and the power supply microprocessor 11 is connected in parallel with the first power switch circuit 127, the second power switch circuit 128 and the third power switch circuit 129, and the first power switch circuit 127 receives the power of the external power supply unit 121 and transmits to the charging control circuit 124, and the second power switch circuit 128 receives the power of the external power supply unit 121 and transmits it to the power supply module 1, and the third power switch circuit 129 receives the power of the storage battery 125 and transmits it to the power supply module 1, and the power supply microprocessor 11 to switch the first, second and third power switch circuits 127, 128, 129 to achieve power configuration. the

When the utility model is in operation, the system is powered on and initialized, and the power supply microprocessor 11 of the power supply module 1 first executes the built-in program and reads the system setting parameters stored in the memory, and scans the resonance point of the coil, and the power supply microprocessor 11 Automatic frequency conversion scanning detects the maximum resonance point frequency F0 of the power supply coil array 152 and the capacitor array 151 of the power supply resonance circuit 15, the system-defined minimum resonance point frequency F1, the system normal operation resonance frequency F2, the system maximum operation resonance point frequency F3 and power supply microprocessing The highest resonance point frequency F4 output by the device 11, the resonance frequency is stored in the memory, and the power supply microprocessor 11 stores the contrasted resonance frequency value in its memory, and the standby state is carried out, and the power supply microprocessor 11 does not output pulse width modulation. Change (PWM, Pulse Width Modulation) signal to the first and second drive circuits 13, 14 so that the power supply resonant circuit 15 will not emit electromagnetic wave energy, and start a predetermined time timing cycle, when the timing cycle is up, the power supply microprocessor 11 outputs Transient pulse width modulation (PWM) signal to the first and second drive circuits 13 and 14 to make the power supply resonant circuit 15 emit electromagnetic wave energy for power transmission, read the state of the data signal, and the signal sampling circuit 16 is received by the power supply coil array 152 The corresponding detection of the feedback data signal of the electric module 2, if sometimes, enters the power supply mode after receiving the data signal of the power receiving module 2, and the power supply microprocessor 11 outputs a continuous pulse width modulation (PWM) signal to the first and second drivers The circuits 13 and 14 make the power supply resonant circuit 15 emit electromagnetic wave energy and start to transmit power to the power receiving module 2. If there is no time, it will return to the standby state. If the system is abnormal or the signal of the power receiving end is offline, the power supply mode will be interrupted and enter Standby will also return to standby. the

From the above, it is known that the power supply module 1 of the present utility model can be connected to the external power supply unit 121 by using a power input interface (such as a universal serial bus, an AC-DC converter, or a mains plug, etc.), and the external power supply unit 121 can input different voltages of high and low Power supply, in addition, the power receiving device 122 receives (such as solar energy, kinetic energy or thermal energy collector) external micro energy source and stores the DC power to the battery 125 without interruption, for the battery 125 to be continuously charged, and the voltage detection circuit 126 is used to detect the external power supply unit 121 And the status of storage battery 125, switch to carry out with four kinds of operation modes, the first mode has the external power supply unit 121 to input high power supply power (such as under the situation of mains power or alternating current to direct current transformer), the power supply microprocessor 11 judges with high power supply The first and second power switch circuits 127 and 128 are switched on, and the power can be directly used by the transmitting circuit and transmitted to the storage battery 125 for charging, and the third power switch circuit 129 is turned off at the same time, while the second mode has an external power supply unit 121 In the case of inputting general power supply power (such as the universal serial bus of a computer), the power supply microprocessor 11 judges that the operation mode of the general power supply is switched and the second power switch circuit 128 is turned on. If it is not enough for charging, the first and third power switch circuits 127 and 129 are turned off at the same time, and when the third mode has no external power, the power supply microprocessor 11 judges to switch with the storage battery 125 operation mode and the third power switch circuit 129 is turned on , use the electric power in the storage battery 125 for the transmission circuit, and close the first and second power switch circuits 127, 128 at the same time, and the fourth mode has no external power, and at the same time, the voltage detection circuit 126 detects that the storage battery 125 is insufficient. Cut off all the power of the system until the power supply is detected or the voltage of the storage battery 125 is charged to the operating value to start again, and close the first, second and third power switch circuits 127, 128, 129. the

Next, the AC power of the external power supply unit 121 is converted into DC power by the power circuit 12, and then the power circuit 12 supplies stable low-voltage power to the microprocessor 11 for use, and the high-voltage power is respectively supplied to the first and second drive circuits 13, 14, and the first and second drive circuits 13, 14 are respectively provided with two or more parallel MOSFET arrays 131, 132, 133, 141, 142, 143, and in the power supply mode, the microprocessor can be powered 11 Output pulse width modulation (PWM) signals to the first and second drive circuits 13 and 14, and control the switching actions of the MOSFET arrays 131, 132, 133, 141, 142, 143 to drive the power supply resonant circuit 15 The capacitor array 151 and the power supply coil array 152 match and resonate to generate oscillation and emit resonant electromagnetic wave energy to the power receiving end of the power receiving module 2, and the data signal received by the signal sampling circuit 16 can be used for analog/digital signal conversion and data analysis circuit 161 for analysis, and the voltage detection circuit 17 checks and analyzes the power output of the power supply resonant circuit 15, and then transmits it to the power supply microprocessor 11 to determine whether to send power to the power receiving module 2. the

In addition, the power supply microprocessor 11 can also check the operating temperature of the first and second drive circuits 13, 14 and the power supply coil array 152 by the temperature detection module 18. When the temperature is abnormal, the power supply microprocessor 11 can shut down the first and second driving circuits Two drive circuits 13, 14 operate, or change the number of MOSFET arrays 131, 132, 133, 141, 142, 143 according to power requirements, use parallel connection to redesign and solve, and cooperate with software programs to operate safely and efficiently Wireless power supply can be carried out, and then the status of the system can be detected in real time through the software program, and the output power can be adjusted in real time according to the load status, and multi-point voltage and temperature monitoring can also be carried out. the

When the above-mentioned power supply module 1 scans the resonance point of the coil, the power supply microprocessor 11 first reads the highest resonance frequency set by the system parameters stored in the memory, and then outputs a pulse width modulation (PWM) signal to the first and second The drive circuits 13 and 14 drive the power supply resonant circuit 15, and the power supply microprocessor 11 automatically scans and detects the coil signal amplitudes of the power supply coil array 152 and the capacitor array 151 of the power supply resonant circuit 15, and compares the detected coil signal amplitude with the system setting Whether the comparison of the fixed parameters is within the range, if the coil signal amplitude is higher than the system set parameters, the resonance frequency is increased, and the coil signal amplitude is moved to the highest operating resonance point frequency F3 of the system, and then the output pulse width modulation (PWM ) signal to the first and second driving circuits 13 and 14 to drive the power supply resonant circuit 15, if the coil signal amplitude is lower than the system setting parameters, the resonant frequency will be lowered, and the coil signal amplitude will move towards the minimum resonant point frequency F1 defined by the system , and then repeatedly output pulse width modulation (PWM) signals to the first and second drive circuits 13, 14 to drive the power supply resonant circuit 15. If the coil signal amplitude is within the system setting parameter range, the power supply microprocessor 11 will resonate The frequency value is stored in its memory and used as the resonant frequency F2 in the normal operation of the system. the

When the timing cycle of the power supply module 1 expires, the power supply microprocessor 11 outputs a short-term pulse width modulation (PWM) signal to the first and second drive circuits 13 and 14 to make the power supply resonant circuit 15 emit electromagnetic wave energy, and then read the memory The resonant frequency value stored in, and output pulse width modulation (PWM) signal to the first, second drive circuit 13, 14 makes the power supply resonant circuit 15 emit the highest resonant point frequency F4 set by the system parameters, to correct the descending resonant When the frequency reaches the value of the resonant frequency stored in the memory, the resonant frequency stored in the output memory is continuously used to transmit power to the power receiving module 2 or to detect and feed back data signals. the

In addition, when the power supply module 1 receives the data signal from the power receiving end of the power receiving module 2, the system enters the power supply mode, and the power supply microprocessor 11 analyzes the data signal of the power receiving module 2 received by the power supply coil array 152 through the signal sampling circuit 16. identification code, the power supply microprocessor 11 judges, if it is an incorrectly corresponding identification code, it is judged that there is no corresponding power receiving module 2, and the power supply mode is interrupted to enter the standby state; if it is a correct corresponding identification code, Then read the power output data of the system setting parameters stored in the memory, and judge the power demand of the power receiving module 2 to correct its power output size. If the power output is to be reduced, the output pulse width modulation (PWM) signal is increased. frequency, make the first and second drive circuits 13 and 14 reduce the power output size of the power supply resonant circuit 15, if it is to increase the power output, then reduce the output pulse width modulation (PWM) signal frequency, so that the first and second drive circuits 13,14 improve the power output of the power supply resonant circuit 15, then check the power output state of the system power supply, and the power supply microprocessor 11 checks and judges the power output of the power supply resonant circuit 15 through the voltage detection circuit 17, if the power output exceeds At present, when the output of the first and second drive circuits 13 and 14 is limited, the number of groups of MOSFET arrays 131, 132, 133, 141, 142 and 143 driven by the first and second drive circuits 13 and 14 is increased. If the power output is When the output limit of the first and second drive circuits 13 and 14 is lower than the current limit, the number of groups of MOSFET arrays 131, 132, 133, 141, 142 and 143 driven by the first and second drive circuits 13 and 14 will be reduced. When the output is within the range limited by the current first and second drive circuits 13 and 14, the group of MOSFET arrays 131, 132, 133, 141, 142, 143 driven by the first and second drive circuits 13 and 14 will not be changed. Then check the operating temperature of the first and second driving circuits 13, 14 and the power supply coil array 152 through the temperature detection module 18, and then the power supply microprocessor 11 judges whether the operating temperature is within the preset temperature limit range, if yes , that is, the temperature is normal, prepare for the next inspection, and then repeat the above-mentioned power supply microprocessor 11 through the signal sampling circuit 16 to analyze the sequence of the identification code of the data signal of the power receiving module 2 received by the power supply coil array 152, if not, Then the power supply mode is interrupted to enter the standby state. the

In addition, when the power receiving resonant circuit 22 of the power receiving module 2 receives the electromagnetic wave energy emitted by the short-term pulse width modulation (PWM) signal output by the power supply module 1, the power receiving module 2 system enters the boot program, and the power receiving microprocessor 21 Turn off the first power switch 242 and the second power switch 244 of the synchronous rectifier 23 and the filter circuit 24, and when the power supply module 1 detects and receives the identification code of the data signal fed back by the power receiving module 2, it transmits power to the power receiving module 2, The powered microprocessor 21 turns on the synchronous rectifier 23, and checks the voltage condition of the high-frequency filter capacitor 241 of the filter circuit 24 through the voltage detection circuit 26. If the voltage is lower than the limit, the powered microprocessor 21 outputs an increase in power demand. coded signal to the signal modulation circuit 27, and the power receiving coil array 221 transmits a data signal to the power supply module 1 to modify the power output. If the voltage is higher than the limit, the power receiving microprocessor 21 outputs a coded signal to reduce the power demand to the signal modulation circuit 27, and transmits data signals from the power receiving coil array 221 to the power supply module 1 to correct the power output, and then checks whether the voltage of the high frequency filter capacitor 241 is within the limit through the voltage detection circuit 26, and if it is within the limit, the power receiving microprocessing The device 21 turns on the first power switch 242. When it is not within the limit, the power receiving microprocessor 21 judges whether the continuous voltage of the high frequency filter capacitor 241 is too high. If it is not, the power receiving microprocessor 21 passes the voltage detection again. The circuit 26 checks the voltage status of the high-frequency filter capacitor 241 of the filter circuit 24. If it is too high, it is in an error state, and the powered microprocessor 21 closes the first power switch 242 and the second power switch 244 of the synchronous rectifier 23 and the filter circuit 24. , and then the power receiving microprocessor 21 outputs a coded signal for interrupting the power requirement to the signal modulation circuit 27, and the power receiving coil array 221 transmits a data signal to the power supply module 1 to stop power transmission, and then enters the standby state. the

In addition, when the powered microprocessor 21 turns on the first power switch 242, it will check the voltage condition of the low-frequency filter capacitor 243 of the filter circuit 24 through the voltage detection circuit 26. If the voltage is lower than the limit, the powered microprocessor 21 will output The coded signal for increasing the power demand is sent to the signal modulation circuit 27, and the data signal is sent by the power receiving coil array 221 to the power supply module 1 to correct the power output, and when the voltage is higher than the limit, the power receiving microprocessor 21 outputs the code for reducing the power demand The signal is sent to the signal modulation circuit 27, and the data signal is transmitted by the power receiving coil array 221 to the power supply module 1 to correct the power output, and the power receiving microprocessor 21 checks whether the voltage of the low frequency filter capacitor 243 is within the limit through the voltage detection circuit 26, if When not within the limit, that is, the power receiving microprocessor 21 judges whether the continuous voltage of the low frequency filter capacitor 243 is too high, if not, even if the power receiving microprocessor 21 returns to the low frequency filter circuit 24 through the voltage detection circuit 26 to check If the voltage status of the filter capacitor 243 is yes, then it is in an error state, and the power receiving microprocessor 21 closes the first power switch 242 and the second power switch 244 of the synchronous rectifier 23 and the filter circuit 24, and then acts as a low frequency filter capacitor. When the 243 voltage is within the limit, the power receiving microprocessor 21 turns on the second power switch 244, and the second power switch 244 starts to supply power to the output part 25 of the power receiving end to output DC power, and the filter circuit is checked by the temperature detection module 28 24 and the power receiving coil array 221 operating temperature is higher than the limit, when the temperature is too high, then it is an error state, the repeated power receiving microprocessor 21 closes the first power switch 242 and the second power switch of the synchronous rectifier 23 and the filter circuit 24 244, if the temperature is normal, continue to supply power, prepare for the next voltage check, and then return to the action of the powered microprocessor 21 turning on the synchronous rectifier 23. the

It can be clearly known from the above implementation steps that the first and second drive circuits 13, 14 of the power supply module 1 of the present invention utilize two or more parallel MOSFET arrays 131, 132, 133, 141, 142, 143 to Dispersing the passing current, this parallel equivalent resistance effect can reduce the impedance value and heating phenomenon of its electronic components. the

In addition, in view of the existing technology, the designer uses two sets of MOSFET arrays to drive the resonant circuit. Its operation mode can be full bridge operation, and the signal of the two sets of MOSFET arrays can be used to drive the resonance twice as the energy of the power supply voltage. circuit, or it can be driven by a half-bridge, that is, one group is the driving signal, and the other group is connected to the power supply ground to drive the resonant circuit with the energy of twice the power supply voltage, but there will be RDS ( ON), which will cause the temperature to rise and burn when a large current passes, so when the MOSFET arrays 131, 132, 133, 141, 142, 143 of the present utility model are burned before the temperature rises abnormally and the overheating occurs That is, the power supply microprocessor 11 can monitor each group of MOSFET arrays 131, 132, 133, 141, 142, and 143 through the temperature detection module 18. When the temperature is abnormal, the power supply microprocessor 11 can shut down its operation, or Change the number of groups of MOSFET arrays 131, 132, 133, 141, 142, and 143 according to the power demand, increase the drive capacity, reduce impedance and temperature when outputting high power, or reduce the number of groups to reduce switching elements when outputting low power power loss. the

Please continue to refer to Figure 4, which is a schematic diagram of the change of resonance frequency and amplitude of the present utility model. It can be clearly seen from the figure that the resonance frequency of the above-mentioned power supply resonance circuit 15 is operated by automatic frequency conversion scanning, and the frequency of each resonance point is defined as follows, where:

F0 is the frequency of the maximum resonant point between the power supply coil array 152 and the capacitor array 151, and its resonant frequency will change with the inductance of the capacitor array 151 and the environment. If the power supply module 1 operates at this point, its amplitude will be very large and cause system damage. overload, so the software architecture of the power supply microprocessor 11 in the present invention will avoid outputting the operating frequency to this resonance point frequency. the

F1 defines the minimum resonance point frequency for the system of the power supply coil array 152 and the capacitor array 151. Since the resonance frequency will change with the capacitance inductance and the environment, it cannot be defined in advance, so the resonance point frequency is preset by the system. The amplitude V1 is defined. the

F2 is the resonant frequency of the normal operation of the system, and the frequency of this resonant point is defined by the preset maximum operating amplitude V2 of the system. the

The highest operating resonance point frequency of the F3 system. the

F4 is the highest resonance point frequency output by the microprocessor 11 for power supply. the

Since the operating frequency range needs to be defined in the operation of the system to avoid insufficient output power or overload, it is necessary to control the power output through continuous automatic frequency conversion scanning and correction. The scanning method is to output the highest resonance point frequency F4 and start to drop , and the amplitude of the coil signal is getting larger and larger, and the amplitude of the coil signal will also pass through V2 and V1 in sequence. When reaching V1, the power supply microprocessor 11 will stop the power output, and the corresponding resonance frequency value can be stored in Its memory is used for operation, and the corresponding detection of the power receiving module 2 is started at the V2 resonant frequency. In the system, F1, F2, F3, and F4 are non-fixed values, which will be continuously revised according to the power demand of the power receiving module 2 The resonant frequency is used to achieve the effect of automatic adjustment and control of power output. the

In the utility model, the frequency conversion system corresponds to various driving voltages, such as high voltage (mains, AC to DC transformer), general voltage (USB output of computer device) or low voltage (battery voltage) input source, as shown in Figure 4 It shows that the three curves are composed of the same group of coils and capacitors, the resonance curves are different under different voltage sources, and at the same frequency with high output power V1 or low output power V2, the higher the driving voltage, the higher the Output amplitude, when the output demand is high output power V1, and when a high voltage input source is used, the system automatically adjusts the coil signal amplitude to move to the highest operating resonance point frequency F3 to output to the target power, while using a general voltage input source, The system automatically adjusts the coil signal amplitude to move to the system normal operation resonance frequency F2 to output to the target power, and when using a low voltage input source, the system automatically adjusts the coil signal amplitude to move to the minimum resonance point frequency F1 defined by the system to output to the target In addition, when the output demand is low output power V2 and a high-voltage input source is used, the system automatically adjusts the coil signal amplitude to move to the highest resonance point frequency F4 to output the target power. When using a general voltage input source, The system automatically adjusts the coil signal amplitude to move to the system's highest operating resonance frequency F3 to output the target power. When using a low-voltage source input source, the system automatically adjusts the coil signal amplitude to move to the system's normal operating resonance frequency F2 to output to the target Power is used to adjust the power setting value of the system target by changing the working frequency, and the change is a slight change in actual operation. The system can automatically set the output to the closest target value through software operation analysis, so that the utility model When using a low-voltage input source (such as a battery device, etc.), because the output voltage will change with the power in the battery device, the above-mentioned variable operating frequency method can be used to use a non-fixed power supply voltage, and it is not necessary to first pass the voltage through After the boost circuit reaches a fixed value, it can be used by the transmitter circuit of the wireless charging system. the

In addition, the above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. In the utility model, when the frequency conversion output is used from the system no output to the start-up output, it also starts to output from the F4 frequency And quickly reduce the frequency to the system preset F2 resonant frequency. If this method is not used, the system will directly output the F2 resonant frequency from the standby state. The characteristics of the resonant circuit will first generate excessive oscillation and then slow down to stabilize state, and because of repeated standby in the system design, starting to send the detection signal and then entering the standby state, the excessive oscillation of the input signal at the beginning will also continue to occur, resulting in current shock and electromagnetic wave interference (EMI, Electromagnetic Interference) of electronic components Magnetic Interference) and other problems, so using the automatic frequency conversion technology of the utility model, the amplitude of the coil signal can be changed from small to amplified stable state, and no signal surge will occur, and the frequency can also be controlled to optimize the power output to achieve power saving. For example, all products that can achieve the aforementioned effects should be covered by the utility model, and such simple modifications and equivalent structural changes should be included in the patent scope of the utility model in the same way. the

To sum up, the portable wireless charging device of the present utility model can indeed achieve its efficacy and purpose when used, so the utility model is a utility model with excellent practicability and meets the application requirements for a utility model patent , file an application in accordance with the law, and hope that the review committee will approve this utility model as soon as possible to protect the hard work of the designer. If the review committee has any doubts, please feel free to send a letter to instruct, and the designer will do his best to cooperate. the

Claims (3)

1. portable wireless charging device, include supply module, have memory in the set power supply microprocessor of supply module, and the power supply microprocessor is electrically connected with the power circuit that can receive external power source, the power supply microprocessor is parallel with can be by first drive circuit and second drive circuit of power circuit power supply, and in first drive circuit, second drive circuit is respectively equipped with two groups of above MOSFET arrays in parallel, first drive circuit is electrically connected with the power supply resonant circuit with capacitor array, the power supply resonant circuit is electrically connected with can be by the second drive circuit power supply VTIC energy to the supply lines coil array that is subjected to electric module, and the supply lines coil array is electrically connected with signal sampling circuit, this signal sampling circuit is parallel with data parsing circuit and the voltage detecting circuit that is connected in the power supply microprocessor, it is characterized in that:

The power circuit of this supply module has the external power supply unit and the power receiving system of the different big small voltages of input, and power receiving system is connected with collecting circuit, the charging control circuit that collecting circuit passes through to be connected is stored to power supply in the storage battery, the power supply microprocessor is by the external power supply unit and the storage battery of connected voltage detecting circuit detection system source voltage, and the power supply microprocessor is parallel with first power switch circuit that switches in order to electrical arrangement, second source switching circuit and the 3rd power switch circuit, wherein, first power switch circuit is in order to the power supply that receives the external power supply unit and reach charging control circuit, the second source switching circuit is in order to the power supply that receives the external power supply unit and reach supply module, and the 3rd power switch circuit is in order to the power supply that receives storage battery and reach supply module.

2. portable wireless charging device as claimed in claim 1 is characterized in that, the external power supply unit of this supply module changes direct-current transformer with USB, alternating current or city's plug connects the input power supply.

3. portable wireless charging device as claimed in claim 1 is characterized in that, the power supply microprocessor of this supply module is electrically connected with the temperature detecting module that can check first drive circuit, second drive circuit and supply lines coil array operational temperature.

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