[问题] 110伏转220伏的变压器

[comefromwhere]

分析啥？那么便宜，一看就不是变压器的。这种开关电路，输出估计是方波。能支持1600W的变压器你还想带着去旅行？

看着个，还不算大：http://www.amazon.cn/家居装修/dp/B00JK8OA7M

opposite is true...110V to 220V

 

[etobicoke]

提醒大家注意：
加拿大住宅用电不是三相电，烘干机，炉具等大功率设备，使用的是两组120V电源，两组串联使用是240V。一般来说，从国内带来的发热式电器可以正常使用，只是功率会大一些。

You are right in most of the buildings.

 

[shimh]

opposite is true...110V to 220V

可惜，他家倒转的只有110到220的。这样就是用在120上，出来也是240，和直接接L1, L2一样了。 不过叫有执照的拉一根240的出来的费用，可以买1 - 2个豆浆机了。

 

[b4w]

this should solve all the problem:

http://www.amazon.ca/gp/product/B004MPR3XQ/ref=ox_sc_act_title_2?ie=UTF8&psc=1&smid=A3DWYIK6Y9EEQB

500W 功率不大。这个贴主的豆浆机就800瓦。而且你这产品介绍最后两行：

Remember to leave at least a 100 percent slack for the Voltage Converter Transformer. for TVs, Xbox and PS3 consoles, the power surge margin is 3 times the wattage rating of these products. Heating appliances, laser printers and power tools spike when you turn them On. For these products you need to buy a Voltage Converter Transformer that is at least 3 to 4 times the rated wattage.

话说得有点汗糊没底气，说明这个500瓦还有水分的，考虑开关电源瞬间的电冲击，这玩艺只能支持 500/3 或 500/4瓦的负载

 

[我从山东来]

北美入户大部分是split phase结构，两个相差180度的120Vac, 零线(Neutral)是变压器的中心抽头，见附图：
没有三相电入户。

 

[comefromwhere]

500W 功率不大。这个贴主的豆浆机就800瓦。而且你这产品介绍最后两行：

Remember to leave at least a 100 percent slack for the Voltage Converter Transformer. for TVs, Xbox and PS3 consoles, the power surge margin is 3 times the wattage rating of these products. Heating appliances, laser printers and power tools spike when you turn them On. For these products you need to buy a Voltage Converter Transformer that is at least 3 to 4 times the rated wattage.

话说得有点汗糊没底气，说明这个500瓦还有水分的，考虑开关电源瞬间的电冲击，这玩艺只能支持 500/3 或 500/4瓦的负载

so the bigger the better.

if it is 200W in china, then will 1000W works?

 

[comefromwhere]

this is almost twice as expensive
http://www.amazon.ca/Goldsource®-He...verter-Universal/dp/B00H9Z3FVU/ref=pd_cp_23_1

 

[shimh]

this is almost twice as expensive
http://www.amazon.ca/Goldsource®-He...verter-Universal/dp/B00H9Z3FVU/ref=pd_cp_23_1

对于800W还是不够

For safety, it's recommended by the manufacturer that the voltage transformer's maximum power should be equal or greater than the power rating of your appliance multiplied by 1.5. For example, if you have an appliance rated at 100 watts, you will need to pick a transformer with a maximum power of 150 watts or greater.

 

[comefromwhere]

对于800W还是不够

For safety, it's recommended by the manufacturer that the voltage transformer's maximum power should be equal or greater than the power rating of your appliance multiplied by 1.5. For example, if you have an appliance rated at 100 watts, you will need to pick a transformer with a maximum power of 150 watts or greater.

hey I don't care 800w, mine is 200w

 

[comefromwhere]

but 6KG...........wow , so damn heavy

 

[comefromwhere]

double the W, double the weight.......wow

 

[annyInRain]

我也看不懂这些电路。还是买一个变压器吧。Amazon有卖的，
http://www.amazon.ca/Goldsource®-He...1-fkmr0&keywords=220v+to+110v+converter+1000w

 

[GM2000]

没说错呀。同相不就0V了。三相各相差120度，我们这个”两相“差180度。

I guess the term "相" (phase) is too technical or it is translated differently outside of mainland. An electrician may know how to do it and doesn't need to know why.

 

[月下独酌]

线圈不是理想的超导体，除了电感量之外，本身有直流阻抗，过电流要生热。原来初级线圈输入电压110V，反过来插工作电压220V, 电流的直流分量I(dc)=U/R，U为线圈端电压，R为线圈直流电阻，U为原来2倍，直流电流I(dc)也高一倍，发热功率P=I^2R是原先4倍，线圈就烧了。老电工不知道这个？

你打算上多少A啊
110V一个插座标配是15A，算你用12guage的线，一公里才5ohm.. 变压器的热量不是来自于线圈，主要是来自于磁场induction吧

再不济你不会弄个盆，倒满菜籽油，放进去？

 

[b4w]

你打算上多少A啊
110V一个插座标配是15A，算你用12guage的线，一公里才5ohm.. 变压器的热量不是来自于线圈，主要是来自于磁场induction吧

再不济你不会弄个盆，倒满菜籽油，放进去？

概念错误吧，热量来自电流通过 resistance，不是来自 inductive reactance。现实世界的线圈，不可能是纯感抗的，必有电阻，这是发热的原因，如果用超导材料，就不会发热了，但目前还不存在常温超导。
科普连接：
http://en.wikipedia.org/wiki/Electrical_reactance