How to adjust the output voltage of the transformer? Method for adjusting the output voltage of a transformer

A transformer is an important electrical device that can transform electrical energy, especially in power systems. widely. The main function of a transformer is to convert high voltage into low voltage or low voltage into high voltage, thereby achieving efficient power transmission. When using a transformer, it may be necessary to adjust the output voltage according to the actual situation. The adjustment method of the transformer output voltage will be introduced in detail below.

1. Principle of voltage regulation

The voltage regulation of a transformer mainly relies on the influence of magnetomotive force. When a current flows through one side of the transformer, the current interacts with the electromotive force to generate a magnetomotive force, which then acts on the winding on the other side through the magnetic circuit to generate electromotive force and current. By controlling the size of the input side current, the size of the magnetomotive force can be adjusted, thereby achieving the purpose of adjusting the output voltage.

2. Manual adjustment method

Manual adjustment method is the most commonly used method. It adjusts the output voltage by manually adjusting the switch on the transformer or the wiring of the transformer winding. To manually adjust the output voltage of the transformer, you need to turn off the load on the output side of the transformer. After confirming that the input voltage of the transformer remains unchanged, manually adjust the wiring method or switch of the transformer, and then turn on the output load of the transformer. In this way, the output voltage can be adjusted.

The main advantage of manual adjustment is that it is simple and easy to operate, does not require the use of additional equipment, and is low cost. However, since the manual adjustment method requires manual operation, there may be instability during the adjustment process due to misoperation or lack of manpower.

3. Automatic adjustment method

The automatic adjustment method uses some automatic control devices to stabilize the output voltage within the set range. Automatic adjustment methods can be subdivided into two types: electrical automatic adjustment methods and electronic automatic adjustment methods.

1. Electrical automatic adjustment method

Electrical automatic adjustment method is a method that uses electrical transmission and control to realize automatic adjustment of output voltage. It mainly realizes changes in circuit adjustment parameters through variable resistance, induced voltage and other components to adjust the output voltage.

Connect the variable resistor to the winding of the transformer, and automatically adjust the resistance of the variable resistor according to changes in the output voltage of the transformer, thereby achieving the purpose of adjusting the output voltage. Common variable resistors include rotary potentiometers and adjusting potentiometers. The rotary potentiometer can be adjusted manually by rotating the handle, while the adjusting potentiometer can be automatically adjusted through a certain circuit control method. The method of automatically adjusting the output voltage by adjusting the variable resistor is called the "voltage divider circuit automatic adjustment method".

2. Electronic automatic adjustment method

Electronic automatic adjustment method is a method of automatic adjustment through modern electronic technology. It can automatically adjust the input current of the transformer to adjust the output voltage.

Common electronic automatic adjustment methods include voltage dividing automatic adjustment method, fixed frequency automatic adjustment method, AC voltage regulation and static voltage stabilization method, etc. These methods all replace the mechanical variable resistor with electronic components and achieve automatic adjustment through a feedback loop.

4. Transformer boost adjustment method

When the transformer boosts voltage, there are two common adjustment methods: one is to rely on the self-excited voltage regulation method, that is, through the transformer Its own power supply embeds the regulating circuit and control circuit into the transformer; the other is to connect the self-excited motor in series and embed the regulating circuit Embedded into the self-excited motor control loop to achieve voltage boost regulation.

1. Self-excited voltage regulation method

The self-excited voltage regulation method is a common method to achieve voltage boost regulation of transformers. It embeds the regulating circuit and control circuit into the transformer through the transformer's own power supply to achieve voltage boost regulation.

The self-excitation voltage regulation method realizes self-excitation, which requires the low-voltage amplifier and control circuit power supply of the transformer through an external power supply. When the external power supply is cut off, the transformer cannot function properly. The main advantages of the self-excited voltage regulation method are simple structure and low cost. The disadvantage is that its adjustment accuracy is low and it is difficult to achieve precise adjustment.

2. Series-connected self-excited motor method

Series-connected self-excited motor method is another common method to realize transformer boost regulation. It realizes voltage boost regulation by connecting self-excited motors in series and embedding the regulating circuit into the self-excited motor control loop.

The advantages of the series-connected self-excited motor method are high adjustment accuracy and stable control effect. The disadvantage is that the structure is complex and the cost is high. At the same time, in order to avoid excessively increasing the load current, the rated load of the self-excited motor needs to be strictly controlled so that it can operate within the rated parameter range.

The above is the method for adjusting the output voltage of the transformer. In actual use, various factors need to be considered comprehensively to select a suitable adjustment method. Whether it is manual adjustment or automatic adjustment, the output voltage of the transformer can be adjusted. Especially in the context of the rapid development of modern electronic technology, it has become a trend to achieve precise adjustment of the transformer output voltage through automatic adjustment.