What are the operation modes of switching power supply

As the name implies, switching power supplies use electronic switching devices (such as transistors, FETs, thyristor, etc.),

Through controlling the circuit, the electronic switch equipment can be switched on and off constantly, and the electronic switch equipment can pulse modulate the input voltage, then realize the DC/AC, DC/DC voltage conversion, and the output voltage can be tuned and automatically stabilized.

Switching power supply generally has three types of operation: fixed frequency and pulse width, fixed frequency and variable pulse width, and variable frequency and pulse width. The former operation mode is mostly used for DC/AC inverter power supply, or DC/DC voltage conversion; The latter two operation modes are mostly used for switching regulated power supply. In addition, there are three operation methods for switching power supply output voltage: direct output voltage method, average output voltage method and amplitude output voltage method. Similarly, the former operation method is mostly used for DC/AC inverter power supply or DC/DC voltage conversion; The latter two operation methods are mostly used for switching regulated power supply.

According to the connection method of switching equipment in the circuit, switching power supply can be generally divided into three categories: series switching power supply, parallel switching power supply, transformer switching power supply. During this period, transformer switching power supply (hereinafter referred to as transformer switching power supply) can further share dividends: push-pull, half bridge, full bridge, etc; According to the excitation of the transformer and the phase of the output voltage, dividends can be distributed: forward, flyback, single and double excitation, etc; If it is useful, it can also share more varieties.