The output voltage of the coil transformer is as high as 44 7V after rectification, which is scary

The output three wires should be dual 18V transformers, output after 18V rectification, and output after 36V finishing. When overhauling electrical appliances with electricity, even if the voltage is not too high, you should be careful, safety is the main thing, right? The voltage of V is dangerous, and it is necessary to pay attention to safety when operating.

1. If you want the transformer to output accurate 24V and 12V voltages, it is recommended to disassemble the original 27V and these two windings, and then rewind them according to the calculated data, which is not difficult. The low-voltage winding is generally wound around the outermost layer of the toroidal transformer, and the following points should be paid attention to when dismantling:

1. Do not damage the insulating paint of the enameled wire.

2. Memorize the number of turns of each winding (write it down on paper).

3. After dismantling, carefully check whether the insulation layer of the primary (such as 220V) winding is intact (if the space allows, it is recommended to add another layer of insulation.)

4. Divide the number of turns recorded on the paper by the corresponding voltage value respectively to get the ratio of the number of turns that need to be wound per volt: turns.

Rewind the new winding:

1. Multiply the turns by 12V and 24V respectively to get the number of turns that the new winding should wind.

2. Winding the new winding according to the calculated number of turns.

3. If space permits, an insulating layer can be added between each winding.

4. After winding the new winding, check that it is correct, and first power on the test to observe whether the output voltage value of the new winding is correct. The no-load transformer should not be obviously heated, and the new winding should be checked for a short circuit between wires.

5. If conditions permit, it should be placed in the oven for drying, and then drip-dried by dipping insulating paint.

6. Place it in the oven and heat it until the insulating paint on the surface of the transformer is dry and there is no sticking phenomenon.

Second, if you don't want to rewind the transformer, it depends on what you use the transformer for. Because 27V is not much different from 24V and 12V, if you want to use it as a rectifier regulated power supply, then it is recommended not to change it. As a DC regulator, a "voltage regulation link" is required to adjust the stability of the output DC voltage, as long as some correction measures are made in the "voltage regulation link", such as increasing the radiator area of the adjustment tube, or calculating according to the maximum output current of the voltage regulator, it is feasible to add a resistor with appropriate resistance value between the rectification and the adjustment tube to reduce the higher voltage value.

Hope it helps.

Generally, the voltage after AC rectification by full-wave rectification or bridge rectification and capacitor filtering is 2 times of the root number of the input AC voltage, which is calculated as a double in the case of load.

Therefore, the voltage at no load after 24V rectification filtering is about 24*; The voltage with load is 24*.

24×√2/

where is the voltage drop of the rectifier device.

Hello:13 V of transformer outputAlternating current, is its valid value.

WhenBridge rectificationafter the DC voltage, passing through the electrolytic capacitorFiltering, the DC voltage is the maximum value V of the alternating current

Possibly, it isVoltmeteror use an AC setting to measure direct current.

Finish.

What do you want to do with it? How many volts do you need?

After 12V AC rectification comes out, it is about 12V times times with load, that is.

If the voltage is not enough, such as the toroidal transformer still has space, the output voltage can be increased by adding the number of winding secondary turns.

That is, use the same enameled wire as the secondary wire diameter of the original transformer to wind on the transformer, first wind ten times, and measure how much the voltage increases after connecting with the secondary coil, so that you can calculate how many turns you need to wind (pay attention to the same name end when connecting with the original coil in series, if the same name terminal is reversed, the voltage will drop).

If the transformer space is large enough and the enameled wire cannot be found, you can also use an insulated wire to add a coil.

Bridge rectification increases electrolytic capacitance.