Classification of sockets and switching power supplies

Update:11-01-2020
Summary:

There are many types of sockets and switching power sup […]

There are many types of sockets and switching power supplies, so there are many classification methods. The reason we help you to classify is to allow customers to understand the electronic components products such as sockets more clearly. Now, let me introduce you:
(1) Classification of sockets by driving method
The socket power is classified according to the driving mode, which can be divided into self-excitation and other excitation. In self-excited sockets and switching power supplies, a positive feedback loop is formed by the sockets and switching tubes and high-frequency transformers to complete self-excited oscillation; while separately-excited sockets and switching power supplies must be equipped with an oscillator, the socket pulse generated by the oscillator is added to On the socket tube, control the on and off of the socket tube.
(2) The socket is classified according to the working mode of the DC / DC converter
The socket power is classified according to the working mode of the DC / DC converter, which can be divided into single-ended forward and flyback, push-pull, apple bridge, full bridge, etc .; step-down type, step-up type and step-up and step-down type Wait. Single-ended sockets and switching power supplies use only one socket and switch, push-pull and half-bridge use two sockets and switch, and full-bridge use four sockets and switch. Generally speaking, a power supply with a small power (1-100W) uses a simple circuit and a low cost flyback circuit. It is better to use a flyback circuit with a power of more than 100W and a large working environment interference, poor input voltage quality, and frequent output short circuits. , You should use a forward circuit; for power greater than 500W, better working conditions, it is reasonable to use a half-bridge or full-bridge circuit; if the cost requirements are more stringent, you can use a half-bridge circuit; if the power Very large, you can use a bridge-type circuit; push-pull circuit is usually used for low input voltage, high power occasions.
(3) Sockets are classified by circuit composition
Sockets and switching power supplies are classified according to circuit composition, and there are resonant and non-resonant types.
(4) Classification of sockets by control method
Sockets and switching power supplies are classified according to the control method, including pulse width modulation (PWM) type, pulse frequency modulation (PFM) type, and PWM and PFM mixed types.
(5) The sockets are classified according to whether the power supply is isolated and the feedback control signal is coupled.
Sockets and switching power supplies are classified according to whether the power supply is isolated and the feedback control signal coupling method. There are isolated, non-isolated, transformer-coupled, and optical-coupled types.
The combination of the above methods can form a variety of sockets and switching power supplies. Therefore, designers need to effectively combine according to the characteristics of various methods to produce high-quality socket power supplies that meet the needs.