The disassembly method of the switching transformer is urgently required

50Hz, 220V 60W bulb, 270mA current, series into the transformer winding, even if the transformer's own other windings have been short-circuited, or artificially short-circuited other windings, according to the transformer electromagnetic principle, the primary current emergency increases dramatically, but due to the current limiting effect of the 60W bulb (270mA), will it heat up? In addition, the winding of the high-frequency switching transformer working above 40kHz, for the 50Hz alternating current frequency, its inductive reactance is very small, far less than the impedance of the bulb, which is similar to the DC impedance, and the result is; The bulb is always on, the transformer is slightly cool, because of the theoretical analysis, I have not used this method, for reference, I use the boiling method, I hope to really practice the peer correction, similar methods, commonly used in electrician maintenance, for the power frequency transformer, the motor winding is added to the low-voltage alternating current heating up and softening and removal,

Yesterday, in order to wrap around the autotransformer (also called the matcher), I dismantled it like this: first put the switching transformer into a pot and boil it for ten minutes (note that the boiling water should submerge the switching transformer), then take it out and wrap it in a towel, pull the upper and lower cores with your hand, and disassemble it after a while.

Here's how I took it apart, put the transformer in a proper box, with the lid open, of course, and then blow it hot with a hair dryer that I used to shave my head, and turn it on with a utility knife while it was hot.

Put the switching transformer to be removed on the heating plate of the rice cooker and heat it for a while, which is easy to remove.

PS-18 constant voltage, constant current, switch test adjustable DC power supply.

1 Fully isolated design, high security.

It can be used for relay protection devices and switching operation circuits 80 voltage adjustable power supply.

2. It can be used to test the self-starting performance of the switching power supply of the protection device, and test the starting voltage of the switching power supply.

3 Can be used for DC adjustable power supply from 0V to 300VDC for various devices.

4 It can be used as a small charger to charge the battery pack.

5 It can be used as an automatic test of the operating voltage value of the switch (circuit breaker).

6 Can be used for switching (circuit breaker) operation time.

Equipment features: It can be used as a constant voltage source, a constant current source, and a switching test power supply.

1. When used as a stabilized power supply, the regulated voltage value can be arbitrarily preset at 0 300VDC, and the whole process can be adjusted, and the voltage stabilization accuracy is high.

2. When used as a constant current power supply, the constant current value can be arbitrarily preset from 0 10ADC, and the whole process can be adjusted. It can be used as a small charger for constant current charging of the battery pack.

3 It can be used as an automatic test of the operating voltage value of the switch (circuit breaker).

4 Can be used for switching (circuit breaker) operation time.

5. Precise and continuously adjustable output, and the whole process of voltage stabilization value and constant current value can be adjusted arbitrarily.

6. Strong anti-shock load capacity, the maximum instantaneous working current can reach 30A.

7. Built-in high-precision digital voltmeter current and voltage display, easy to use.

8 Built-in digital millisecond meter, LCD display millisecond meter data.

9. Using PWM technology, small size, light weight, low loss, short circuit self-protection.

10. It has the function of output opening and closing, and the output can be turned on after presetting the output voltage or constant current.

11. It has perfect protection against over-current, over-voltage, short circuit, overload and over-temperature, and has high reliability.

12 Fully isolated design, high security.

13 32-bit ARM processor with high-performance Cortex-M3 core, fast data processing speed and high precision.

14 Integrates two major functions: universal adjustable power supply and intelligent millisecond meter, cost-effective.

15. The output voltage is adjusted by rotary coding switch, which is safe and reliable.

16 When used as a constant current power supply, the constant current value can be preset from 0 to 10A.

17. Strong anti-shock load capacity, the maximum instantaneous working current can reach 30A.

18. When used as a constant current power supply, it can be used as a small battery pack charger for constant current charging.

19 Comes with a high-precision digital voltmeter, which is easy to use.

20. Adopt 16-bit PWM technology, small size, light weight, low loss, short circuit self-protection.

21. It has the function of output opening and closing, presetting the constant current and turning on the output.

22. It has perfect over-current, over-voltage, overload, over-temperature protection, and high reliability.

23 The on-off time and on-off status of the external switch can be measured at the same time.

First of all, figure out the motor voltage.

Take the motor 12V as an example:

Find a few phone chargers at random, preferably the old-fashioned kind.

The output is about 7 9V for the general switching mobile phone charger, and the output of the old-fashioned transformer mobile phone charger is 12 15V.

I don't know if you have high requirements for motor torque, if it is not high, the switch-on mobile phone charger can directly meet the requirements.

If it is high, the transformer mobile phone charger (heavier than the switch-type mobile phone charger, heavy hand) plus 7812 is OK.

If it is a 6V motor and has high requirements for motor torque, the switch-type mobile phone charger +7806 is OK. It's okay not to add it, but the motor should not run for a long time, otherwise it is easy to overheat and burn out.

It seems that the motors on toys in general are 3 6V.

The capacitance and voltage reduction is not safe, in case of output break, the power supply side break point is 220V.

If the working current of the motor exceeds 100mA, do not use capacitor to step down, because the 400V capacitor with a withstand voltage of more than 2U is not necessarily much cheaper than the transformer**, and there are potential safety hazards.

The workaround is as follows:

1.The use of electronic transformers, small size and light weight.

2.The use of bidirectional thyristor to make electronic voltage regulation circuit, such a circuit and capacitor step-down are not electrically insulated, must pay attention to safety (you can choose the commercially available thyristor fan governor}.

However, it is recommended to use a transformer for the sake of safety, after all, safety comes first.

Tolerance buck is dangerous, find a computer power supply with 5 and 12V on it.

What you are asking for is a centralized schematic, but the 220kv main transformer has a lot of protection, and it is also a double set of protection, and the whole diagram will have a lot of crossing, which looks messy.

How much power? , how often AC is there.

8050？The current is so small, you can directly use the single-chip microcomputer output switch signal to calculate.

How much power do you want (not a lot) and how often do you want it, and so on.

KVA is commonly used, which is detailed on page 16 and table 11 of GB T6451-2008 Technical Parameters and Requirements for Oil-immersed Power Transformers.

GB T6451-2008 Technical parameters and requirements for oil-immersed power transformers.

The safety distance of 10kv transformer is 200mm; The safety distance of 35kV transformer is 450mm; The higher the voltage, the farther the safety distance.

Are you talking about electromagnetic radiation? The transformer on the transformer near the general living area is fine...

None of this is possible without determining which tube, amplification, and output power to use. The parameters of the power amplifier and the output transformer are very different, you choose different tubes, and the parameters of the power transformer and the output transformer are very different. For power transformers alone, some amplifiers may require a voltage of 250V, some may be 300V, 500V, and even more than 1000V.

It's good to want to do it yourself, at least have the desire to learn, but at least have a foundation.