技术领域technical field
本发明一种能实现稳定电压输出的MCR-WPT电路及其控制方法，涉及无线电能传输技术领域。The invention relates to an MCR-WPT circuit capable of realizing stable voltage output and a control method thereof, and relates to the technical field of wireless power transmission.
背景技术Background technique
无线电能传输（Wireless Power Transfer, WPT）技术又称为非接触式无线电能传输技术，应用最为广泛的是基于磁耦合的无线电能传输技术。基于磁耦合的无线电能传输技术根据磁耦合的方式又分为：磁耦合感应式无线电能传输技术（Magnetically-Coupled Inductive Wireless Power Transfer, MCI-WPT）和磁耦合谐振式无线电能传输技术（Magnetically-Coupled Resonant Wireless Power Transfer, MCR-WPT），其中MCI-WPT技术较为成熟且传输效率高、功率大；但致命弱点是传输距离短，在厘米级别距离内才具有较高的传输效率。MCR-WPT技术自2007年与麻省理工学院被发现以来，就因其传输距离较远的优势而备受人们关注和研究工作者的青睐。无论是MCI-WPT技术还是MCR-WPT技术都存在一个缺点，传输效率会随着传输距离的改变而波动，这样就造成了输出功率不稳定，因此现有的WPT技术在很多对功率稳定性要求较高的场合并不适用。Wireless Power Transfer (WPT) technology, also known as non-contact wireless power transfer technology, is the most widely used wireless power transfer technology based on magnetic coupling. According to the way of magnetic coupling, the wireless power transfer technology based on magnetic coupling is divided into: Magnetically-Coupled Inductive Wireless Power Transfer (MCI-WPT) and Magnetically-Coupled Resonant Wireless Power Transfer (Magnetically-Coupled- Coupled Resonant Wireless Power Transfer, MCR-WPT), among which MCI-WPT technology is relatively mature, with high transmission efficiency and high power; but the Achilles heel is the short transmission distance, and the high transmission efficiency can only be achieved within centimeter-level distances. Since the MCR-WPT technology was discovered with the Massachusetts Institute of Technology in 2007, it has attracted people's attention and research workers' favor because of its advantage of long transmission distance. Whether it is MCI-WPT technology or MCR-WPT technology, there is a shortcoming that the transmission efficiency will fluctuate with the change of transmission distance, which will cause the output power to be unstable. Therefore, the existing WPT technology has many requirements for power stability. Higher occasions do not apply.
发明内容Contents of the invention
本发明提供一种能实现稳定电压输出的MCR-WPT电路及其控制方法，使得输出功率在传输距离变化的情况下能够保持稳定，解决了现有无线电能传输技术输出电压随距离变化而快速变化的缺点。The invention provides an MCR-WPT circuit capable of realizing stable voltage output and its control method, so that the output power can be kept stable when the transmission distance changes, and solves the problem that the output voltage of the existing wireless power transmission technology changes rapidly with the distance change Shortcomings.
本发明采取的技术方案为：The technical scheme that the present invention takes is:
一种能实现稳定电压输出的MCR-WPT电路，包括：电源侧电路、发射端电路、谐振匹配接收端电路、负载侧电路、电压负反馈控制电路；An MCR-WPT circuit capable of realizing stable voltage output, including: a power supply side circuit, a transmitter circuit, a resonant matching receiver circuit, a load side circuit, and a voltage negative feedback control circuit;
电源侧电路连接发射端电路，发射端电路的谐振电感与谐振匹配接收端电路的谐振电感之间构成谐振腔，谐振匹配接收端电路连接负载侧电路，谐振匹配接收端电路、负载侧电路连接电压负反馈控制电路。The power supply side circuit is connected to the transmitter circuit, the resonant inductance of the transmitter circuit and the resonant inductance of the resonant matching receiver circuit form a resonant cavity, the resonant matching receiver circuit is connected to the load side circuit, and the resonant matching receiver circuit and the load side circuit are connected to the voltage Negative feedback control circuit.
所述电源侧电路包括交流电源AC、第一二极管全桥整流电路、滤波电容C1、高频逆变电路、激励线圈L1；交流电源AC连接第一二极管全桥整流电路，第一二极管全桥整流电路通过滤波电容C1连接高频逆变电路，高频逆变电路的桥臂连接激励线圈L1两端。The power supply side circuit includes an AC power supply AC, a first diode full-bridge rectifier circuit, a filter capacitor C1, a high-frequency inverter circuit, and an excitation coil L1; the AC power supply AC is connected to the first diode full-bridge rectifier circuit, and the first The diode full-bridge rectifier circuit is connected to the high-frequency inverter circuit through the filter capacitor C1, and the bridge arm of the high-frequency inverter circuit is connected to both ends of the excitation coil L1.
所述发射端电路包括谐振电感Lr1、谐振电容Cr1，谐振电感Lr1一端连接谐振电容Cr1一端，谐振电感Lr1另一端连接谐振电容Cr1另一端。The transmitter circuit includes a resonant inductor Lr1 and a resonant capacitor Cr1, one end of the resonant inductor Lr1 is connected to one end of the resonant capacitor Cr1, and the other end of the resonant inductor Lr1 is connected to the other end of the resonant capacitor Cr1.
所述谐振匹配接收端电路包括谐振电感Lr2、谐振电容Cr2、两个IGBT及与之反向并联的两个二极管；IGBT管VT5的发射极连接二极管VD5阳极，二极管VD5阴极连接IGBT管VT5的集电极，IGBT管VT5的集电极连接IGBT管VT6的集电极，IGBT管VT5的发射极连接谐振电容Cr2一端，谐振电容Cr2另一端连接IGBT管VT6的发射极，谐振电感Lr2并联在谐振电容Cr2两端。The resonant matching receiver circuit includes a resonant inductance Lr2, a resonant capacitor Cr2, two IGBTs and two diodes connected in reverse parallel thereto; the emitter of the IGBT tube VT5 is connected to the anode of the diode VD5, and the cathode of the diode VD5 is connected to the collector of the IGBT tube VT5 Electrodes, the collector of IGBT tube VT5 is connected to the collector of IGBT tube VT6, the emitter of IGBT tube VT5 is connected to one end of resonant capacitor Cr2, the other end of resonant capacitor Cr2 is connected to the emitter of IGBT tube VT6, and the resonant inductor Lr2 is connected in parallel between the two ends of resonant capacitor Cr2 end.
所述谐振腔是发射端电路的谐振电感Lr1、谐振匹配接收端电路的谐振电感Lr2之间的空间区域。The resonant cavity is a space area between the resonant inductance Lr1 of the transmitting end circuit and the resonant inductance Lr2 of the resonant matching receiving end circuit.
所述负载侧电路包括负载线圈L2、第二二极管全桥整流电路、滤波电容C2、负载R；负载线圈L2的两端连接第二二极管全桥整流电路桥臂，第二二极管全桥整流电路通过滤波电容C2连接负载R。The load side circuit includes a load coil L2, a second diode full-bridge rectifier circuit, a filter capacitor C2, and a load R; both ends of the load coil L2 are connected to the bridge arm of the second diode full-bridge rectifier circuit, and the second diode The tube full-bridge rectifier circuit is connected to the load R through the filter capacitor C2.
所述电压负反馈控制电路包括两个减法器、两个PID控制器和PWM信号发生器；PWM信号发生器一端连接IGBT管VT5的栅极、IGBT管VT6的栅极；PWM信号发生器另一端连接第一PID控制器一端，第一PID控制器另一端连接第一减法器一端，第一减法器另一端连接第二PID控制器一端，第二PID控制器另一端连接第二减法器一端。The voltage negative feedback control circuit includes two subtractors, two PID controllers and a PWM signal generator; one end of the PWM signal generator is connected to the grid of the IGBT tube VT5 and the grid of the IGBT tube VT6; the other end of the PWM signal generator One end of the first PID controller is connected, the other end of the first PID controller is connected to one end of the first subtractor, the other end of the first subtractor is connected to one end of the second PID controller, and the other end of the second PID controller is connected to one end of the second subtractor.
所述激励线圈L1与发射端电路中的谐振电感Lr1非直接接触，谐振匹配接收端电路的谐振电感Lr2与负载线圈L2也非直接接触，通过电磁直接感应耦合的方式实现电能传递。The excitation coil L1 is not in direct contact with the resonant inductance Lr1 in the transmitting end circuit, and the resonant inductance Lr2 in the resonant matching receiving end circuit is also in direct contact with the load coil L2, and the electric energy transmission is realized by electromagnetic direct inductive coupling.
所述发射端电路中的谐振电感Lr1和谐振匹配接收端电路的谐振电感Lr2距离间隔较远。The resonant inductance Lr1 in the transmitting end circuit and the resonant inductance Lr2 in the resonant matching receiving end circuit are relatively far apart.
本发明一种能实现稳定电压输出的MCR-WPT电路及其控制方法，优点在于：An MCR-WPT circuit capable of realizing stable voltage output and a control method thereof according to the present invention have the advantages of:
（1）：当传输距离在一定范围内变化时，本发明始终能维持输出电压的稳定，解决了现有无线电能传输技术输出电压随距离变化而快速变化的这一缺点。(1): When the transmission distance changes within a certain range, the present invention can always maintain the stability of the output voltage, which solves the shortcoming of the existing wireless power transmission technology that the output voltage changes rapidly with the distance.
（2）：本发明大大提高了无线电能传输技术的实际应用价值，许多对电压精度要求较高的用电设备，采用现有的无线充电技术显然不能满足需求，但本发明可以对其进行稳定、安全地无线充电；(2): The present invention greatly improves the practical application value of the wireless power transmission technology. Many electric devices that require high voltage accuracy obviously cannot meet the demand with the existing wireless charging technology, but the present invention can stabilize them. , Safe wireless charging;
（3）：本发明在使用过程中非常便捷。现有的无线电能传输装置在使用过程中需要严格控制发射端线圈和接收端线圈的距离，故通常都是将接收线圈固定在一个点；而本发明在使用上非常灵活便捷，可在一定范围内随意改变两线圈的相对位置。(3): The present invention is very convenient during use. The existing wireless power transmission device needs to strictly control the distance between the transmitting coil and the receiving coil during use, so the receiving coil is usually fixed at one point; however, the present invention is very flexible and convenient in use, and can be used within a certain range The relative position of the two coils can be changed at will.
（4）：本发明通过改变接收端谐振电容值、以改变接收端和发射端谐振匹配程度，从而实现稳定输出电压。(4): The present invention achieves a stable output voltage by changing the resonant capacitance value of the receiving end to change the resonance matching degree of the receiving end and the transmitting end.
附图说明Description of drawings
图1为本发明的主电路及其控制电路图。Fig. 1 is the main circuit and its control circuit diagram of the present invention.
图2为本发明的控制算法流程图。Fig. 2 is a flow chart of the control algorithm of the present invention.
具体实施方式detailed description
如图1所示，一种能实现稳定电压输出的MCR-WPT电路，包括：电源侧电路、发射端电路、谐振匹配接收端电路、负载侧电路、电压负反馈控制电路。As shown in Figure 1, an MCR-WPT circuit capable of achieving stable voltage output includes: a power supply side circuit, a transmitter circuit, a resonant matching receiver circuit, a load side circuit, and a voltage negative feedback control circuit.
电源侧电路连接发射端电路，发射端电路的谐振电感与谐振匹配接收端电路的谐振电感之间构成谐振腔，谐振匹配接收端电路连接负载侧电路，谐振匹配接收端电路、负载侧电路连接电压负反馈控制电路。The power supply side circuit is connected to the transmitter circuit, the resonant inductance of the transmitter circuit and the resonant inductance of the resonant matching receiver circuit form a resonant cavity, the resonant matching receiver circuit is connected to the load side circuit, and the resonant matching receiver circuit and the load side circuit are connected to the voltage Negative feedback control circuit.
所述电源侧电路包括交流电源AC、第一二极管全桥整流电路、滤波电容C1、高频逆变电路、激励线圈L1；交流电源AC连接第一二极管全桥整流电路，第一二极管全桥整流电路通过滤波电容C1连接高频逆变电路，高频逆变电路的桥臂连接激励线圈L1两端。The power supply side circuit includes an AC power supply AC, a first diode full-bridge rectifier circuit, a filter capacitor C1, a high-frequency inverter circuit, and an excitation coil L1; the AC power supply AC is connected to the first diode full-bridge rectifier circuit, and the first The diode full-bridge rectifier circuit is connected to the high-frequency inverter circuit through the filter capacitor C1, and the bridge arm of the high-frequency inverter circuit is connected to both ends of the excitation coil L1.
所述发射端电路包括谐振电感Lr1、谐振电容Cr1，谐振电感Lr1一端连接谐振电容Cr1一端，谐振电感Lr1另一端连接谐振电容Cr1另一端。The transmitter circuit includes a resonant inductor Lr1 and a resonant capacitor Cr1, one end of the resonant inductor Lr1 is connected to one end of the resonant capacitor Cr1, and the other end of the resonant inductor Lr1 is connected to the other end of the resonant capacitor Cr1.
所述谐振匹配接收端电路包括谐振电感Lr2、谐振电容Cr2、两个IGBT及与之反向并联的两个二极管；IGBT管VT5的发射极连接二极管VD5阳极，二极管VD5阴极连接IGBT管VT5的集电极，IGBT管VT5的集电极连接IGBT管VT6的集电极，IGBT管VT5的发射极连接谐振电容Cr2一端，谐振电容Cr2另一端连接IGBT管VT6的发射极，谐振电感Lr2并联在谐振电容Cr2两端。The resonant matching receiver circuit includes a resonant inductance Lr2, a resonant capacitor Cr2, two IGBTs and two diodes connected in reverse parallel thereto; the emitter of the IGBT tube VT5 is connected to the anode of the diode VD5, and the cathode of the diode VD5 is connected to the collector of the IGBT tube VT5 Electrodes, the collector of IGBT tube VT5 is connected to the collector of IGBT tube VT6, the emitter of IGBT tube VT5 is connected to one end of resonant capacitor Cr2, the other end of resonant capacitor Cr2 is connected to the emitter of IGBT tube VT6, and the resonant inductor Lr2 is connected in parallel between the two ends of resonant capacitor Cr2 end.
所述谐振腔是发射端电路的谐振电感Lr1、谐振匹配接收端电路的谐振电感Lr2之间的空间区域。The resonant cavity is a space area between the resonant inductance Lr1 of the transmitting end circuit and the resonant inductance Lr2 of the resonant matching receiving end circuit.
所述负载侧电路包括负载线圈L2、第二二极管全桥整流电路、滤波电容C2、负载R；负载线圈L2的两端连接第二二极管全桥整流电路桥臂，第二二极管全桥整流电路通过滤波电容C2连接负载R。The load side circuit includes a load coil L2, a second diode full-bridge rectifier circuit, a filter capacitor C2, and a load R; both ends of the load coil L2 are connected to the bridge arm of the second diode full-bridge rectifier circuit, and the second diode The tube full-bridge rectifier circuit is connected to the load R through the filter capacitor C2.
所述电压负反馈控制电路包括两个减法器、两个PID控制器和PWM信号发生器；PWM信号发生器一端连接IGBT管VT5的栅极、IGBT管VT6的栅极；PWM信号发生器另一端连接第一PID控制器一端，第一PID控制器另一端连接第一减法器一端，第一减法器另一端连接第二PID控制器一端，第二PID控制器另一端连接第二减法器一端。该电路的输出电压随传输距离变化时能够保持稳定的控制方法如图2所示。The voltage negative feedback control circuit includes two subtractors, two PID controllers and a PWM signal generator; one end of the PWM signal generator is connected to the grid of the IGBT tube VT5 and the grid of the IGBT tube VT6; the other end of the PWM signal generator One end of the first PID controller is connected, the other end of the first PID controller is connected to one end of the first subtractor, the other end of the first subtractor is connected to one end of the second PID controller, and the other end of the second PID controller is connected to one end of the second subtractor. The control method that the output voltage of this circuit can keep stable when the transmission distance changes is shown in Fig. 2 .
工作原理：working principle:
电能传输的原理：The principle of power transmission:
1、交流电源AC经过第一二极管全桥整流电路整流、和滤波电容C1滤波后，变为稳定的直流电压，直流电压经过高频逆变电路后变为高频交流电压，并通过直接电磁直接感应耦合的方式，将电能从激励线圈传递到发射端，发射端与接收端通过电磁谐振耦合的方式，实现电能较远距离的传输；接收端和负载侧通过电磁直接感应耦合的方式，实现了电能从接收端到负载线圈的传递，在经过第二二极管全桥整流电路整流和滤波电容C2滤波后，变为稳定的直流电压为负载供电。最后，在谐振腔距离改变时，电压负反馈控制电路可通过控制谐振匹配接收端电路中的谐振电容Cr2值的大小，来稳定输出功率。1. After the AC power supply AC is rectified by the first diode full-bridge rectifier circuit and filtered by the filter capacitor C1, it becomes a stable DC voltage. The DC voltage becomes a high-frequency AC voltage after passing through the high-frequency inverter circuit, and passes through the direct The electromagnetic direct inductive coupling method transfers the electric energy from the exciting coil to the transmitting end, and the transmitting end and the receiving end realize the long-distance transmission of electric energy through the electromagnetic resonance coupling; the receiving end and the load side adopt the electromagnetic direct inductive coupling method, The transmission of electric energy from the receiving end to the load coil is realized, and after being rectified by the second diode full-bridge rectifier circuit and filtered by the filter capacitor C2, it becomes a stable DC voltage to supply power to the load. Finally, when the distance of the resonant cavity changes, the voltage negative feedback control circuit can stabilize the output power by controlling the value of the resonant capacitor Cr2 in the resonant matching receiving end circuit.
2、第一二极管全桥整流电路由四个二极管VD1、VD2、VD3和VD4组成，其输入端接交流电源，输出端经过电容C1滤波稳压后，接逆变电路的输出端。2. The first diode full-bridge rectifier circuit is composed of four diodes VD1, VD2, VD3 and VD4. Its input terminal is connected to the AC power supply, and the output terminal is connected to the output terminal of the inverter circuit after being filtered and stabilized by the capacitor C1.
3、逆变电路由四个IGBT开关管VT1、VT2、VT3和VT4组成，其输出端接激励线圈L1；3. The inverter circuit is composed of four IGBT switch tubes VT1, VT2, VT3 and VT4, and its output terminal is connected to the excitation coil L1;
4、所述激励线圈L1与发射端电路中的谐振电感Lr1非直接接触，通过电磁直接感应耦合的方式实现电能传递。激励线圈在高频交流电压下将产生高频交变磁场，同处于该交变磁场中的发射端谐振电感Lr将通过直接耦合的方式产生高频感应电压，实现了电能从电源侧电路到发射端电路的传递。4. The excitation coil L1 is in indirect contact with the resonant inductance Lr1 in the transmitting end circuit, and the power transmission is realized through electromagnetic direct inductive coupling. The excitation coil will generate a high-frequency alternating magnetic field under the high-frequency AC voltage, and the resonant inductance Lr at the transmitting end, which is also in the alternating magnetic field, will generate a high-frequency induced voltage through direct coupling, realizing the power from the power supply side circuit to the transmitting end. Transmission of end circuits.
5、所述发射端电路中的谐振电感Lr1和谐振匹配接收端电路的谐振电感Lr2距离间隔较远, 为线圈直径的几倍，一般可达1米左右。这也是MCR-WPT技术的突出优点，二者之间的空间为谐振腔。Lr、Cr和高频电压的频率f三者之间满足谐振条件5. The resonant inductance Lr1 in the transmitting end circuit and the resonant inductance Lr2 in the resonant matching receiving end circuit are far apart, several times the diameter of the coil, generally up to about 1 meter. This is also the outstanding advantage of MCR-WPT technology, the space between the two is a resonant cavity. The resonance condition is satisfied between Lr, Cr and the frequency f of the high-frequency voltage
当谐振匹配接收电路中的两个开关管VD5和VD6都断开时，结构和参数都完全一样发射端电路和谐振匹配接收端电路将具有同一谐振频率而发生电磁谐振耦合，此时电能将实现从发射端到接收端的中距离高效传递；When the two switches VD5 and VD6 in the resonant matching receiving circuit are disconnected, the structure and parameters are exactly the same. The transmitting end circuit and the resonant matching receiving end circuit will have the same resonant frequency and electromagnetic resonance coupling will occur. At this time, the electric energy will be realized. Efficient transmission in the middle distance from the transmitter to the receiver;
6、谐振匹配接收端电路中的谐振电感Lr2与负载线圈L2也非直接接触，也通过电磁直接感应耦合的方式实现电能传递。其原理同步骤（4）。6. Resonant matching The resonant inductance Lr2 in the receiving end circuit is not in direct contact with the load coil L2, and the power transmission is also realized through electromagnetic direct inductive coupling. The principle is the same as step (4).
7、第二二极管全桥整流电路由四个二极管VD7、VD8、VD9和VD10组成，其输入端接负载线圈，输出端经过滤波电容C2滤波稳压后接负载。7. The second diode full-bridge rectifier circuit is composed of four diodes VD7, VD8, VD9 and VD10, the input end of which is connected to the load coil, and the output end is filtered and stabilized by the filter capacitor C2 and then connected to the load.
8、电压负反馈控制电路的原理：输出电压采样值U0与输出电压期望值U0*求差值，经过PID调解以后输出电流调节的参考值is*，is*与负载线圈电流采样值is求差值后经过PID调节后输入PWM信号发生器，PWM信号发生器输出频率与系统谐振频率f相同的PWM信号，控制IGBT开关管VT5和VT6的通断状态。8. The principle of the voltage negative feedback control circuit: Calculate the difference between the output voltage sampling value U0 and the output voltage expected value U0* , after PID mediation, the reference value of the output current adjustment is* , is* and the load coil current sampling value is to find the difference After PID adjustment, it is input to the PWM signal generator, and the PWM signal generator outputs a PWM signal with the same frequency as the system resonance frequency f to control the on-off state of the IGBT switch tubes VT5 and VT6.
实现稳定电压输出的原理：The principle of achieving stable voltage output:
即使发射端电路和接收端电路完全相同且处于同一谐振频率时，MCR-WPT的传输效率仍然会随着两个谐振电感线圈Lr1、Lr2之间的距离，在一定范围内的变化而缓慢变化，基本规律是在最佳谐振距离点左右，传输效率都将下降，这样就会导致输出电压的波动。为了在传输距离变动的情况下，实现稳定电压输出，本发明采取了“谐振匹配”的方法，基本原理是使发射端和接收端处于完全谐振状态下时，系统输出电压大于额定输出电压，然后根据输出电压值调节开关管VT5和VT6的占空比以改变接收端的谐振电容Cr值，从而改变接收端与发射端的谐振匹配程度，到达改变输出电压的目的。具体步骤如下：Even when the transmitter circuit and the receiver circuit are exactly the same and at the same resonance frequency, the transmission efficiency of MCR-WPT will still change slowly with the distance between the two resonant inductance coils Lr1 and Lr2 within a certain range. The basic rule is that the transmission efficiency will decrease around the optimum resonance distance point, which will lead to fluctuations in the output voltage. In order to realize stable voltage output under the condition of transmission distance variation, the present invention adopts the method of "resonance matching". According to the output voltage value, the duty cycle of the switch tubes VT5 and VT6 is adjusted to change the resonant capacitor Cr value of the receiving end, thereby changing the resonance matching degree between the receiving end and the transmitting end, and achieving the purpose of changing the output voltage. Specific steps are as follows:
步骤1：设定额定输出电压为U0；Step 1: Set the rated output voltage as U0;
步骤2：确定稳压输出的有效距离范围Dmin<D<Dmax，首先断开开关管VT5和VT6，使接收端的谐振电容Cr2的值最大，即保持接收端电路处于最佳谐振状态，逐渐增加两个谐振电感线圈Lr1、Lr2之间的距离，使输出电压U逐渐减小，直至输出功率不能满足负载需求时为止，记录下此时的传输距离即为Dmax；再逐渐减小两个谐振电感线圈Lr1、Lr2之间的距离，直至输出功率不能满足负载需求时为止，记录下此时的传输距离即为Dmin；Step 2: Determine the effective distance range Dmin<D<Dmax of the regulated output, first disconnect the switch tubes VT5 and VT6 to maximize the value of the resonant capacitor Cr2 at the receiving end, that is, keep the receiving end circuit in the best resonance state, and gradually increase the two The distance between two resonant inductance coils Lr1 and Lr2 makes the output voltage U gradually decrease until the output power cannot meet the load demand. Record the transmission distance at this time as Dmax; then gradually reduce the two resonant inductance coils The distance between Lr1 and Lr2, until the output power cannot meet the load demand, record the transmission distance at this time as Dmin;
步骤3：当两个谐振电感线圈Lr1、Lr2之间的距离为任意值D时，判定D是否属于Dmin至Dmax范围内；Step 3: When the distance between the two resonant inductance coils Lr1 and Lr2 is an arbitrary value D, determine whether D belongs to the range from Dmin to Dmax;
步骤4：若Dmin<D<Dmax，则在开关管VT5和VT6均处于关断状态时，输出电压U>U0。为了保持电压稳定，应逐步增大开关管VT5和VT6的占空比，使接收端的谐振电容Cr2减小，从而减小接收端与发射端的谐振匹配程度，使得输出电压下降至U0；Step 4: If Dmin<D<Dmax, then when the switch tubes VT5 and VT6 are both in the off state, the output voltage U>U0. In order to keep the voltage stable, the duty cycle of the switch tubes VT5 and VT6 should be gradually increased to reduce the resonant capacitor Cr2 at the receiving end, thereby reducing the resonance matching degree between the receiving end and the transmitting end, so that the output voltage drops to U0;
步骤5：若D <Dmin或者D>Dmax，说明在此距离下，即使开关管VT5和VT6均处于关断状态，即接收端和发射端处于最佳谐振匹配状态时，也无法满足额定输出电压U0，即始终有U<U0，此时应该断开开关管VT5和VT6，即保持接收端电路处于最佳谐振状态，以使输出电压U最大化。Step 5: If D<Dmin or D>Dmax, it means that at this distance, even if the switch tubes VT5 and VT6 are in the off state, that is, when the receiving end and the transmitting end are in the best resonance matching state, the rated output voltage cannot be satisfied U0, that is, there is always U<U0. At this time, the switch tubes VT5 and VT6 should be turned off, that is, to keep the receiving end circuit in the best resonance state, so as to maximize the output voltage U.
| Application Number | Priority Date | Filing Date | Title |
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| CN201710413819.4ACN107104517A (en) | 2017-06-05 | 2017-06-05 | It is a kind of to realize the MCR WPT circuits and its control method of burning voltage output |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710413819.4ACN107104517A (en) | 2017-06-05 | 2017-06-05 | It is a kind of to realize the MCR WPT circuits and its control method of burning voltage output |
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| CN107104517Atrue CN107104517A (en) | 2017-08-29 |
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| CN201710413819.4APendingCN107104517A (en) | 2017-06-05 | 2017-06-05 | It is a kind of to realize the MCR WPT circuits and its control method of burning voltage output |
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