What is the difference between Switch Mode Power Supply and electronic switch? Where are they?
To the electronic switch to open a signal, the line connected, disconnect the control signal or to a shutdown signal, the electronic switch off. The electronic switch differs from the normal switch in that it is non-contact. So to avoid such as manual switch button and contactor lights in the opening and breaking when the spark loss and mechanical noise. And control the power of small control easy. Switching devices in the switching power supply, such as MOS tube and IGBT are all electronic switches, SCR also belong to the electronic switch. And we usually mention the electronic switch is the market of solid-state relays, etc., it is also the principle of the use of thyristor.
Simply put, the switching power supply is controlled by switching devices (such as MOS tube, IBGT tube) on-off time (duty cycle) to achieve the purpose of controlling the output voltage or output current. For example, an AC / DC switching power supply is subject to AC-rectifier-filter-high-frequency switching-high-frequency AC-high frequency rectification-filtering-output stabilized DCs in which closed-loop control is used to achieve output stability. The electronic switch is just a switch only, the control circuit off, just like the ordinary manual switch instead. T
Switching power supply is a large class, usually we say that the switching power supply is AC variable DC power supply, but in fact, including DC variable DC, DC variable AC (inverter) should belong to the switching power supply.
