The single-fire power supply is the most important component of intelligent switches (such as touch switches, wireless remote switches, Zigbee switches, etc.), and its core technology is single-fire line power-taking technology.
The control diagram of the single fire line intelligent switch is as follows:
The technical difficulty of the single fire line intelligent switch: Since the single fire line switch takes any point of electricity to flow through the lamp, when the power consumption of the switch is greater than about 220V/50uA, when the power reaches the internal capacitance charging requirement of the lamp At that time, a momentary current is formed, and a small power W number lamp, such as a 2W LED, is bound to flash. Because of the 2W lamp, it illuminates very little current = 2W/220V = 9mA. This is the so-called "ghost fire", which is the flashing phenomenon of the lamp in the off state.
For the wireless remote control intelligent switch that needs remote control, it is necessary to have more power and balance the "ghost fire" problem, so this is the difficulty of taking power from the single fire line. The instantaneous current required for the switch operation must be at least 2 mA (315 MHz) or 30 mA (ZigBee). Therefore, for ZigBee switch products with large current demand, it is more difficult to take power from a single fire line.
Low-power, low-power power supplies are mainly used in smart home execution units (such as smart switches, smart sockets) or small controllers. The power supply used in this field is usually AC/DC (DC/DC) low-power products. The minimum application requirements may be within 1W, and products with slightly more complex functions may use 2W-5W power products. The requirements for the product are as follows:
(1) Small size, easy to install in standard housing;
(2) Ultra-low power consumption, reducing the standby power consumption of the product or the "ghost" phenomenon of the smart switch
(3) High efficiency and low fever;
(4) Low failure rate and stable and reliable quality are the primary factors of the product.
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