Why is linear power supply called linear
The reason why a linear power supply is called "linear" is because the relationship between its output voltage and input voltage is linear.
In a linear power supply, the input voltage is stepped down (or stepped up) by a transformer, and the output voltage is stabilized by a linear regulator. Linear regulators regulate the output voltage by adjusting the on and off states of devices such as tubes or transistors to maintain stability.
The working principle of a linear power supply is relatively simple, and the voltage relationship between input and output is linear, meaning that changes in input voltage are directly reflected in the output voltage. When the input voltage changes, the linear power supply linearly adjusts the output voltage through a voltage regulator to maintain a constant output voltage.
Due to the fact that the regulation process of linear power sources is based on linear relationships, they are called "linear" power sources. On the other hand, switching power supplies adjust the output voltage through the switching action of switching devices, and their working principle is not linear.
Although linear power supplies have linear input-output characteristics, their efficiency is relatively low because voltage regulation devices consume a certain amount of power. This is also one of the reasons why switching power supplies are more common in high-efficiency applications.
What transformer is good for linear power supply
Linear power supplies typically use transformers for voltage conversion.
For linear power supplies, it is necessary to choose a suitable transformer to meet the power supply requirements. Here are some key points for choosing a transformer:
1. Matching power requirements: Firstly, it is necessary to determine the power level required by the linear power supply. When selecting a transformer, the power level should be slightly higher than the maximum power required by a linear power source to ensure stable and reliable energy conversion.
2. Identify input/output voltage: Select the transformer based on the input and output voltage requirements of the linear power supply. The input voltage should match the input requirements of the power supply, while the output voltage should match the output requirements of the power supply.
3. Frequency matching: Consider the operating frequency of the linear power supply and select transformers with the same or similar frequency characteristics. Normally, the rated frequency of a transformer should match the operating frequency of the power supply.
4. Current capacity: The current capacity of the transformer should meet the maximum current required by the linear power supply. Ensure that the rated current of the transformer is greater than or equal to the operating current of the power supply to avoid overload and damage.
5. Power loss: Understand the power loss of transformers to ensure the efficiency and stability of the power supply. Choose a transformer with low power loss to reduce energy loss during the energy conversion process.
