Charging batteries through inductive wireless charging is one of the applications that’s becoming very popular and getting appreciated by the uses. Here we’ll study how to make a wireless Li-Ion battery charger circuit using the same concept. Any electrical system which involves wire networks or cables can be very messy and cumbersome.
Introduction
今天，世界获得高科技，电气系统也经过更好，无声的版本，为我们提供更多便利。感应动力传输是一种有趣的概念，便于power transfer without the use of wires, or rather wirelessly.
As the name refers to, inductive power transfer is a process through which a certain magnitude of power is transferred from one fixed place to another through the air without using conductors, just as radio signals or cell phone signals are transmitted.
However the concept isn’t that easy as it sounds to be, because with radios and cell phones the transmitted power is merely in few watts and thus becomes quite feasible, but transferring power (wirelessly) so that it can be used for powering high current devices is entirely a different ball game.
Here we are talking about several watts or probably several hundreds of watts that needs to be carried without any dissipation, from point to the other without using wires, an issue difficult to implement.
However researchers are trying their best to find appropriate set ups which may become just suitable for implementing the above concept successfully.
以下几点概述了概念，并帮助我们了解如何发生上述程序：归纳，因为我们所知道的是一种过程，电力通过该过程从一个位置转移到另一个位置而不包含直接连接。
最好的例子是我们的常规电动变压器，其中输入AC在其绕组之一上施加，并且在另一个绕组通过磁阻接收感应的电力。
However the distance between the two windings inside a transformer is very small and therefore the actions take place very conveniently and efficiently.
当程序需要在更大距离以更大的距离实现时，任务会变得有点复杂。通过评估感应概念，我们发现存在基本上两个障碍物，使得功率传递困难且低效，特别是随着电感目的地之间的距离增加。
第一障碍是频率，第二障碍是绕组芯中产生的涡流。这两个参数是成反比的，因此直接依赖于彼此。
Another factor that hampers the proceedings, is the winding core material, which in turn directly affects the above two parameters.
By carefully dimensioning these factors in the most efficient way, the distance between the inducting devices can be considerably stretched.
为了在上述方法中传输无线电力，我们首先需要一个AC，这意味着需要传送的功率必须是脉动电流。
当施加到绕组时，该电流的这种频率产生涡流，其是反对施加电流的反向电流。
通过芯加热产生更多涡流的产生意味着较低的效率和更大的功率损耗。然而，随着频率增加，涡流的产生比例地减少。
Also, if a ferrite material is used in place of the conventional iron stampings as the core of the winding helps to further reduce the eddy currents.
Therefore for implanting the above concept in the most efficient way we need to make the source power high in frequency, in the order of many kilohertz and use an input induction system that’s made up of ferrite as the core.
希望这些解决问题的程度;at least for the making the proposed project of an inductive charging circuit for Li-ion batteries.
这个怎么运作
WARNING - THE CIRCUIT IS NOT ISOLATED FROM AC MAINS AND SO IS EXTREMELY DANGEROUS IF TOUCHED IN POWERED CONDITION.
这种无线手机充电器电路由我设计，但实际上尚未验证，所以我会建议读者注意到这一点。
The circuit can be understood with the following points:
Referring to the figure we see two units, one is the base or the transmitting module and the other one is the receiver module.
As discussed in the above paragraph, the core material of the base winding is a ferrite E-core which is relatively larger in size. The bobbin that’s fitted inside the E-core has a single stage, neatly wound with 100 turns of 24 SWG super enameled copper wire.
A center tap is extracted from the winding from its 50th winding turn. The above coil or transformer is connected to an oscillator circuit consisting of the transistor T1, preset P1 and the corresponding resistor and capacitor.
预设用于将频率提高到最佳水平，并且需要进行一些。DC电压被馈送到电路，以启动所需的振荡，这通过整流和过滤AC电源直接导出。
On applying the DC, the circuit begins oscillating and the oscillations from the inductor being high in frequency escapes into the air to a considerable distance and needs to be grabbed back for the proposed inductive reception.
The receiving unit also incorporates an inductor consisting of air cored 50 turns of 21 SWG super enameled copper wire, which becomes a kind of antenna for anticipating the released power waves from the base circuit.Capacitor C3 is a variable capacitor, the one used in radio for tuning may be tried.
它用于修剪接收，直到达到谐振点并且L2通过发送波进行最佳地调谐。这瞬间提高了L2的输出电压，并最佳地适用于充电要求。
D6和C4是最终将AC信号转换为纯DC的整流组件。
When brought to a considerable proximity, the inductions from the lower base unit is induced inside the receiving coil, the induced frequency is suitably rectified and filtered inside the receiver circuit and is used for charging the connected Li-Ion battery.
可以通过输出连接LED，以便在任何时间点获得无线电力传输强度的即时指示。
注意：上述解释的无线锂离子电池充电器电路仅基于我的假设;
READERS DISCRETION IS STRICTLY ADVISED WHILE EMPLOYING THE DISCUSSED CONCEPT
AND THE CIRCUIT.
上述零件清单讨论了无线移动电话充电器电路
使得这种电感电池充电电路需要以下部分：
- R1 = 470 Ohms,
- R2 = 10K, 1Watt,
- C1 = 0.47UF / 400V，非极性，
- C2 = 2uF/400V, non polar
C3 =可变团块冷凝器， - C4 = 10uF/50V,
- D1 --- D5 = 1N4007，
- D6 = Equal to Battery voltage, 1watt
- T1 = UTC BU508 AFIL1 = 100匝，25个SWG，中心龙头，在最大可能的铁氧体E-Corel2 = 50堆匝，20个SWG，直径2英寸，空气
Hi GR,
You can use TIP31, but pls be cautioned the circuit has not been tested by me, it's only assumed by me.
... .sorry tip31将无法使用，使用mje13005
先生
How many mah it will give?
Sajjad, it's not a tested design so i am sure about it.
亲爱的，亲爱的，你的工作非常有用，如果我想要更多的安培，它与L1上的匝数有关，对吧？
Thank you, it is the wire volume that decides the current. To increase volume you must increase the thickness of the wire by winding many thin wires in parallel instead of one or two thick wires
先生......我是一个初学者，用很多疑惑。先生，在同一电路中保持整流器和振荡器的角度是什么，因为它们都真的做了相反的工作。整流器使AC与DC和振荡器振荡DC !! ..你可以解释为什么这已经完成或至少给我一个链接，以便我能够更好地理解这一点！谢谢你，先生
Waiting for ur reply cuz dis is really breaking ma head
Clifford, here we need a high frequency, low current supply for feeding L1 and for achieving the specified results.
The mains voltage has lower frequency, very high current which are just the opposite of what's required.
因此，我们首先将其纠正到低电流DC，然后将其转换回AC。
Hello Sir,
谢谢你的电路!我们试过和它的工作原理了!But our problem is it only work at a lower distance, and our teacher required a 6inch distance between transmitter and receiver. our circuit work at a maximum distance of 2inches only. Can you help us on what will be the possible solution to our problem?
谢谢先生 ！上帝保佑。
你好无情的女孩，
谢谢for trying the above circuit successfully, congrats on that!
for increasing the inductive distance you can try increasing value of C2 value to about 4uF or may be you can replace the input DC by a 12V/1amp smps adapter, this would boost the amps inside the circuit thereby increasing its transmitting capacity.
thanks sir.. actually we just modified the circuit..our input is 220v wee just put a step down transformer 3amp before the bridge .. we also used 3amp diode.. we only get about 4inch distance..
无情的女孩，对于从电路的最佳响应，您必须通过适当的计算来构建整个事情，您可以参考以下PDF来了解详细信息：
world-comp.org/p2012/ICW4797.pdf
Hi sir, I have problem on this circuit, can I use this as charger circuit to charge pacemaker device wireless
嗨山姆，是的，你绝对是为了提到的目的使用它！但是您可能必须相应地修改参数
How can I get a feedback which shows this battery is full when a pacemaker is implanted inside of chest
山姆，我可以建议你，但由于起搏器是一个生命支持系统，我不能对结果或任何不良隐患的任何责任。
The receiver will continue to draw current from the transmitter as long as the battery is charging, when the current becomes negligibly small or almost zero we can assume the battery to be full charged. This is the basic concept which can be applied, as indicated in the following article:
//m.addme-blog.com/2015/04/battery-current-indicator-circuit.html
hello sir, thanks for the circuit.
我的项目是建立一个电感充电12V，7Ah铅酸电池可以这个电路帮助我修改时吗？
plz help
Hello Raphael, yes it can be suitably upgraded for the purpose but I have not yet tested it practically so i would be unable to provide you with the required details.
嗨Swagatam，
how can we increase the output current at the receiver side.. ?
嗨Bibin，我认为可以通过增加输入的频率和相应地调谐接收器来完成。
哦..好的..谢谢Swagatam，让我试试，我会发布结果......！
Can the receiving end be modified to use full-wave rectification?
是的，没有问题。
它可以是任何电容器修剪器，通常用于FM无线电。
嗨，请我只想知道你是否已经模拟了电路，如果是，您使用过哪种仿真软件
Thank you
Hi, No the above design has not been simulated on any software, it's based on my assumptions only.
Hi sir.
please with the D6 can I get the model number , and also the L1 and L2 please what is 25WSG and 25WSG.
我可以得到无情的女孩的联系租约。
嗨理查德，
D6可在电池的充电电压规格中评定。虽然它不明显，我建议尝试没有D6的电路，只有在确认基本电路功能一旦确认。
25.SWG is the thickness of the wire used in the design.
对不起，我没有“无情女孩”的联系方式。
Thank you sir.
Please what is the voltage and current getting to the transmetter coil… ?
它是220V / 1AMP ....可以通过绕组1000 + 1000开的铁氧体核心制作
….using 0.3mm wire
谢谢主席先生，你对我们有很大的帮助。谢谢你。
不客气！
Hi, please i want to know the diameter of the transmitter and receiver coils.
Thank you
任何可容纳100圈的任何铁氧体环都将使用100Watt灯与输入电源串联，以避免意外短路和火灾......在尝试之前，请注意谨慎消息。
先生，请这是一个链接到我的页面上看到的电路图，名称是（制作简单的逆变电路）。我会喜欢你给我一个12V太阳能电池板的组件列表及其值。
https://www.homemade-circulay.com/2012/02/how-to-make-simplest-inverter-circuit.html.
sir please help me .
Sir,
here what's the meaning of "e-core" ?
我可以在那里使用铁芯吗？
& what's the value of P1 ?
Narottam,
E-core is a ferrite based core over which the copper winding is supposed to be wound.
iron core will not work.
P1需要进行实验以获得最佳结果。
This is an exteremly difficult circuit, not suitable for new hobbyists…please be informed about this.
行..
thanks sir..
I will try to make..
嗨甜瓜
我认为,手机面糊的主要原因y failure is overcharging. Can you please design an over charge cut off circuit, that can connect between the standard 5v charger and cellphone externely. When the battery reach full charge, phone must disconnect from charger.
谢谢
嗨anil，
所有手机都有一个内置高度高级精密的过充高电荷的截止电路，增加了功能......所以将永远不会需要外部电路。
battery failures could be due to the use of duplicate batteries or sometimes (rarely) due to manufacturing defects.
好的，先生！电路的修改很少，可以使用2n3022在10厘米的情况下转移电力。它很棒！在接收端的SIR PLS我可以加上更多电容器，以减少转移期间的电压下降。而且我的晶体管也很热但正常?????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????
That's commendable Maugost, thanks for updating it. yes you can increase C4 for achieving more improved results.
...使用晶体管添加散热器，以使其更有效。
先生，我也想知道如果我是平行的2n3022，它会在电路上有什么影响，会增加振荡的频率吗？它会增加信号强度吗？还有电容器C4您建议减少接收端的电压降的值是多少？谢谢
它不会产生任何区别，只有晶体管的瓦数处理能力将增加并帮助保持冷却器......但是如果输入电源电流另外增加，则可能增加范围也可能增加。
C4 can be any high value capacitor such as a 3300uF,25V or similar
hiiii sir make this circuit but its not works plz help me sir
嗨unheshwar，您可以尝试以下设计：
//m.addme-blog.com/2016/02/illuminating-led-using-wireless-power.html
i need ur help sir
Which parameter I supposed to change??, battery volt of pacemaker it can be 2.5v or 3 or 3.7v
The transmitter coil specs and the input power to the transmitter will need to be correctly optimized so that the battery inside the pacemaker does not experience an over-current situation.
By the way How did you plan to attach the receiver stage with the pacemaker?
Hi and thank you for the great post, I am looking to wirelessly charge a 12v lithium battery, my problem is the air gap, it needs to work over a 20-30mm airgap and I am stuggling to find some thing to do it.
the Camera it needs to run uses 12V, 230mA per hour.
任何额外的帮助都会得到很多赞赏
Thank you
米娜
嗨，谢谢你。
You can try applying the following design:
https://www.homemade-circules.com/wireless-cellphone-charger-circuit/
Increase the current input for the transmitter to 2 amps, and check if that allows a 2 to 3 cm distance.
Also make sure the receiver output voltage is slightly lower than the Li-ion battery’s full charge level, check it without any battery connected.
嗨甜瓜
问候
Please give me a clarification before I implement your circuit,
我需要12V，10000 MAH锂离子电池的无线充电，距离传输电路10米
Actually my project is Automate Guided vehicles(AGV’s) which are 10 in number
我想给他们所有的无线收费
请帮帮我
Hope you understand me
Waiting for your response
提前非常感谢
Hi Narasimha, it is impossible to create a wireless charger that would efficiently work across a distance of 10 meters.