这里我们试图调查一些增强双向可控硅英航sed phase controller circuits which can be recommended for controlling or operating inductive loads like transformers and AC motors much safely than earlier traditional triac based circuit dimmer circuits.
Using Triacs for Controlling AC Loads
A Triac is a semiconductor device used for switching AC loads. Normally it is recommended that the loads that needs to be operated through triacs should be resistive in nature, meaning loads which incorporate coils or capacitors heavily, must be avoided.
Therefore in general loads which convert energy into heat like incandescent bulbs or heaters etc only become suitable with triacs as the switch and devices like transformers, AC motors and electronic circuits are a big NO!
However recent developments and researches have improved things to great extents and today new triacs and the involved improved circuit configurations have made it absolutely safe even for the triacs to be used for switching purely inductive loads.
I won't be discussing the technical areas of the configurations, keeping the new electronic hobbyists in mind and for the sake of simplicity.
Let's analyze a few of the researched designs which boast to support triacs with inductive loads.
TRIAC控制电路仅适用于电阻载荷
The first circuit shows the general way of using a triac and a diac combination for implementing the required controlling of a particular load, however this design is just not suitable with inductive loads.
The circuit incorporates the principle of triggering with synchronization across the triac. The configuration is the simplest in its form and has the following advantages:
The design is very simple and cheap.
Use of only two end terminal wire and absence of any external power supply.
But one big disadvantage of this design is its incapability of working with highly inductive loads.
TRIAC控制电路合理地适合操作电感载荷
However a little contemplation shows that the above circuit can be simply modified into the design shown in the next diagram.
The principle here now gets transformed to triggering of the triac with synchronization by the mains voltage.
The idea to very extent neutralizes the above issue and becomes very much coordinated even with inductive type of loads.
请注意，在上面的设计中，负载和电阻器连接的位置已更改，以获取预期的结果。
The advantages can be assessed as follows:
Again a simple design and also is very low cost.
Better control of even loads which are inductive by nature.
As usual no external power source is required for the functioning.
The disadvantages though are the involvement of 3 terminal wire ends for the intended connections.
The operations become very asymmetrical and therefore the circuit cannot be used for controlling highly inductive loads like transformers.
TRIAC控制电路理想适用于高度感应载荷，例如变压器和交流电动机
An intelligent tweaking of the above circuit makes it very much desirable even with the most tabooed inductive loads like transformers and AC motors.
这里另一个小敏感的双向可控硅是巧妙地introduced for rectifying the major issue that's primarily responsible for making triacs so unsuitable with inductive loads.
第二个小型TRIAC确保通过产生脉冲火车，保持TRIAC一直活着并一直“踢”，确保TRIAC永远不会被关闭并完全阻塞。
The advantages of the above final design may be marked with the following points:
Very simple design,
Superb accuracy while controlling highly inductive loads,
No use of external power supply.
The above circuit was exclusively developed by the SGS-THOMSON Microelectronics applications laboratory and used with success for a wide range of equipment.
COURTESY:
只需使用两个销钉，即中心和剩下的任何一个。
can you provide the link or original application note for SGS THOMSON
Google在页面底部的礼貌图像中给出的单词，您将立即得到它。
BT169 seems a SCR and not a triac, am I missing something?
Yes BT169 is an SCR, …..it should be BT131 instead.
greetings sir pls if am wrong pls correct me. Rt i guess is a normal resistor of 10k? then how about Rd? that has a value of 6k8? i dont get that part pls
嗨，Ekeh，
I think Rd = 6k8 is incorrect, it should be a low value resistor positioned just for protecting the diac from current surges…..a 100 ohm 1/4 watt resistor will probably do the job.
I HAVE REQUIRED 100 AMP AC SINGLE PHASE MOTER SPEED CONTROL CIRCUIT DIA GRAM ,
THANKS
AZIZ JAMAL;I
Hello sir,
我只需要像计时器这样的电路。但是负载为60 W 340V AC感应。
Please help me in building the circuit using BT169D or any best suitable scr or triac for inductive load
Hello Sarang,
inductive load becomes an issue only when it's switched with a frequency through a triac, just for ON/OFF timer operation it won't pose any problem. you can use the following circuit:
//www.addme-blog.com/2013/07/simple-triac-timer-circuit.html
Timer On time is 3min, and off time is variable 2 to 8 min.
you can use the following circuit, just replace the relay with a triac
//www.addme-blog.com/2012/04/how-to-make-simple-programmable-timer.html
Hello, I love your page, I have a question what values do I need for Rt,Rd,Ts,P,T,D,C if I want to use a transformer of 1100 Watts aprox? (in mains I have 220 Volts and 50 Hz)
您好，我不确定可能适合您应用的确切组件值，但是如今，现代的三轮车主要具有内置的呼吸器和防止归纳载荷的保护，因此我认为您可以舒适地使用任何标准的风扇调光电路并使用高功率TRIAC，例如bta41/800，并带有上述负载，而无需担心。
hi again,if I use the values that you wrote up in the blog:
Rt can be = 10k
P= 220k pot,
Rd = 6k8,
C = 0.1uF/250V
Ts = BT131
and instead the BTA41 a TRIAC of 10 Amps max. should it work? I do not know very much of electronics and I dont´t have any idea on how calculate the values of the components I just dont want to burn anything.
谢谢!
You can try those values but i cannot guarantee the results.
a 10amp triac might work if adequately heatsinked.
实际上，由于您的变压器与电路串联在一起，实际上什么都不会燃烧，而且如果任何东西燃烧，它将是组件之一，而不是您的房屋接线。
Make sure you have an experienced/qualified technician with you while you attempt this experiment.
…..confirm the set up using a 200 watt bulb first, after that you can replace it with the trafo
Hi
I need to switch a transformer using a triac controlled by a controller. the transformer is rated 230/120 V 1.1 KVA. Ineed to switch only during the first few cycles. Can you help me out with this?
萨特维克
you can use any triac based timer and use it for switching your transformer for the desired amount of time:
Hi, for dimming purpose you could try a standard triac dimmer circuit as shown in the last diagram from the following article
//www.addme-blog.com/2012/04/how-to-make-simplest-triac-flasher.html
The triac should be a BTA41 600 for controlling massive currents even upto 40 amps
the dimmer circuit must be employed in series with the mains primary side of the transformer
Hey Swagatam, thanks for you website, clear descriptions and all the time and effort you share. But… I do have a question ;).
我构建了以上电路的最后一个，它可以正常工作，但是RD = 120欧姆。电感载荷只是一个60瓦的呼吸机（我计划将电路用于较重的电感载荷）。但是，当与此60 W负载一起使用时，我无法将RPMS低于全功率的60％以下。我可以简单地增加RD即可进一步降低输出功率吗？谢谢
谢谢Wtg, According to me increasing the value of the pot might help to increase the range on the lower side, because the speed basically depends on how fast or how slow the capacitor is allowed to charge and discharge, therefore by slowing down the charging rate of the capacitor we would be able to decrease the speed of the motor proportionately.
但是你可以与其他componen实验ts also, there are hardly anything in the circuit so identifying the right one will be just a matter of minutes
hello, resistive loads you ca simply use the connects explained in the following article
//www.addme-blog.com/2012/04/how-to-make-simplest-triac-flasher.html
typo correction: I mistakenly wrote connects instead of concepts
Thank you for introducing some of the basic and advanced Triacs circuits. Typically, when adjusting the input of the tranphomer, it produces very loud noise. The circuit you introduced by SGS-THOMSON. I see That’s great, but I’m asking you to try it. If I want to try this circuit and put in
using arc welding machine control
Is it good? Please give me some time. Thank you very much.
you mean to say you want to control a welding transformer power with this circuit? That may be possible, just make sure to use a heavy duty triac (100 amp, 400V) and a compatible diac…if you are unable to get a suitable diac then you can try replacing it with high grade neon bulb
Hello sir Swagatam,
Thank you very much for sharing this article. I want to use the circuit to control my a.c ceiling fan, so I have some questions:
1. Can use it for that purpose without any problem? If yes,
2. I want to connect the circuit in such a way that I will use discrete resistor values (say, 4 resistors) instead of the 220k pot, such that I will use a rotary switch to switch between the resistors to give the fan different rotating speeds (four stages of equal intervals).
这可能吗？如是，
3. What resistor values do you suggest that I use, and what should be thier power ratings?
4. I want to have a fifth state that will bring the fan to a total stop, i.e. four stages for different speed levels and the fifth stage to switch off the fan. How do I achieve this?
预期您通常的及时回复。谢谢你。
Hi Godson, I won’t recommend the above experimental designs, instead you could try the last diagram having 5 step rotary switch controlled fan dimmer from the following article
//www.addme-blog.com/how-to-make-simplest-triac-flasher/
I have checked the link. It is just perfect for my application. Thank you very much sir.
Keep up the good work!
请，该电路可以用于水泵机，冰箱和空调吗？
sorry I am not sure about, you may have to test it practically
Please, the last circuit for inductive load, does it mean it will reduce the power consumption of the load like freezer or what, why is necessary for inductive loads. I have tried your circuit on dimmer, it’s great in reducing the power consumption. Thanks so much for this
Dayo，是的，它将减少消耗以及设备的输出功率。但是我不确定对冰柜等电器产生的影响。
I am glad you could build the linked dimmer circuit successfully
Hi – many years ago I had a 160 amp arc welder in which the transformer primary was controlled by an electronics circuit but the circuit and or components (scr) were not up to the job and soon packed up leaving the machine on max current. The inductive control circuit above would seem to be a good solution to restoring controllability. What components and values would be needed to control a 7kva transformers? Thanks in advance for your help.
Hi, I have not yet practically confirmed the above designs so I cannot suggest anything regarding these concepts.
但是，您可以尝试以下文章中解释的第二个最后一个设计电路，该电路是经过测试的设计，它与上述工作原理非常相似。
//www.addme-blog.com/how-to-make-simplest-triac-flasher/
You can replace the triac with BT141A/800 and replace the DC1 diac with a neon bulb as this one:
//www.addme-blog.com/neon/
HI BRO,
I WANT TO DESIGN PROTECTION CIRCUIT FOR THREE PHASE INDUCTION MOTOR LIKE UNDER VOLTAGE, OVER VOLTAGE, OVER CURRENT ,ETC.I DONT KNOW HOW TO START THE PROCESS.IS THERE ANY IC’S AVAILABLE IN MARKET FOR THIS DESIGN KINDLY HELP ME FOR THIS DESIGN.
THANK YOU,
Hello Moni, I don’t have a protection circuit for a 3 phase supply at this moment, if it’s feasible I will try to design and post it soon in this website.
Hello Swagatam,
我想使用TRIAC更换变压器的主电压。因此，我的负载没有电阻。My load is inductive Can I use AC Welding Circuit which in SGS- Thomson Application Notes ?
Hello Fatih, yes you can use it without any doubts
Thank you so much Swagatam.
To make a adjustable primary voltage of the transformer, I should change potentiometer value (P1 and P2) inAC Welding Circuit which in SGS- Thomson Application Notes. Is that enough ?
谢谢Fatih, yes you can use P1 and P2 for controlling the welding output
Hello,
I have to change primary voltage of the transformer using a triac. For example, I have to drive about 12VAC or 8VAC Lamp in secondary voltage of the transformer by adjusting the primary voltage in any time. Can I use AC Welding Circuit which in SGS- Thomson Application Notes with 1 piece transformer to change primary voltage of the transformer ?
您可以简单地将变压器的初级连接到任何标准light dimmer unit, and it will do the job for you.
Do you have a circuit for controlling the primary of a 8kv 10ma ozone transformer, I can do it with a ww2-5k pot , can’t get one in nz , normal dimmers don’t work need an inductive load type .txt me 021908513, urgent .
normal dimmers can work both with resistive and inductive loads, so you can use them as long as the working supply voltage is below the triac voltage spec
i don’t have any question yet just want to say thank you for this website, it brought me to road on electronics, my God bless you sir
You are most welcome sunny!