The post explains a simple configuration which can be added with all SG 3525/3524 inverter circuits for implementing automatic PWM output voltage regulation by the IC. The solution was requested by Mr. Felix Anthony.
The Circuit Problem:
主席先生，我需要你对一个关于我不理解特定部分的示意图的项目。我们的讲师在印刷纸上给了我们原理图，以便自己构建电路。He listed the parts but building the circuit is not easy for me as there is one section I do not really understand what that IC represents.你可以帮我请我用笔圈的部分是电路的一部分，我并不真正了解它。电路的绘图被我给予的计算机运营商颠倒了。非常感谢您即将到来的评论。
解决电路问题
The section that's circled is a simple bridge rectifier with a potential divider stage in the form of a 100k pot. It rectifies and sends a sample feedback voltage from the inverter mains output to pin1 of the IC which identifies this feedback and accordingly controls the PWM of the IC and regulates it so that the output from the inverter never exceeds a predetermined limit as set by the 100k preset.
pin1 is the sensing input of the IC which responds and makes the PWMs narrower whenever the fed voltage from the 100k pot exceeds a certain predetermined limit.
IC SG3525 / 3524的PIN1实际上形成内部误差放大器Opamp的引脚之一。术语误差放大器本身建议分配OPAMP以感测并检查来自逆变器输出的反馈样本电压（误差信号）并相应地校正输出PWM宽度。参考IC（PIN16）的另一个引脚对该电压感测，其在内部固定在5.1V的参考电压。
在检测到上升反馈的情况下，IC的PIN1的电位是误差放大器的感测输入比例地高于OPAMP的另一个互补PIN16在内部误差OPAMP的输出处产生高。
This high is utilized internally to modify or slim down the PWM frequency which in turn forces the mosfets to conduct with proportionately lower current, thus correcting the output voltage of the inverter automatically with respect to the feedback signal.
Parts list for the above shown SG 3525 inverter circuit with auto PWM voltage control feature
嗨先生，使用两个晶体管的多谐振动器系统为我提供帮助和设计逆变器驱动器电路
Then design for me the suitable power stage to be used, thanks.
嗨Kakooza，您可以参考以下帖子：
//www.addme-blog.com/2012/07/simplest-and-best-100-watt-inverter.html
//www.addme-blog.com/2012/02/how-to-make-simple-200-va-homemade.html
干得好的Swagatam，如何计算建造逆变器的效率及其功率评级，特别是基于变压器的效率。我有几种公式，但如何获得PIN和POUT是问题。
thanks atinuke, the easiest way is by practically connecting a known load at the inverter output, then by measuring the current through the load and through the battery separately.
之后，电池侧电流可以乘以电池电压以获得输入瓦数。
同样的输出端电流外壳d be multiplied with the output voltage for verifying the output wattage.
最后将输出结果除以输入结果并将100乘以100将对给定负载提取逆变器的效率。
Sir
please can explain to me how to choose a MOSFET for an inverter
for example choosing IRF540 for 1000W inverter how will I know the number of this MOSFET I will connect in parallel to govet me 1000w at the transformer output
Chiduben, first find the maximum current handling capacity of the mosfet…then divide 1000 by this value. This will provide the number of mosfets that needs to be connected in parallel…
保留20％+/-保证金
Sir please you can retry to make the diagram of this circuit ? I see anything in this circuit…
马特，我放大了图表请检查它......
再次感谢你的帮助。充电器电路您将我推荐为48V充电器，输入56V输入。请在30amp时修改它可以修改它以给我24V
The same circuit can be used for charging a 24V battery also, make sure to use 28V as the input