The single-fire line power supply is the most important component of intelligent switches (such as touch switches, wireless remote control switches, Zigbee switches, etc.), and its core technology is single-fire line power-taking technology.
The control diagram of the single firewire 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 wireless remote control smart switches that require remote control, it is necessary to have more power and balance the "ghost fire" problem, so this is the difficulty of taking power from a 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 less than 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 the 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.
This series of products is a subminiature DC/DC (AC/DC) power supply with a SIP4 pin configuration. Its size is L18*W9.5*H15.5mm, which is a small size for this type of power supply in the industry. Its characteristics are well controlled due to the advanced circuit structure. It is very suitable for a wide range of applications in smart home products such as smart switches. It has been successfully applied to many smart home products, such as smart sockets (zero Fire line), smart switch (single fire line), etc. Specific product parameters can be referred to:
Figure a2 pin diagram
Figure a3 package size chart
Features:
â— Ultra-wide input voltage: 13-380VDC
â— Output protection function: short circuit and over current protection
â— High efficiency: the maximum efficiency of the power supply is 65%;
â— High current: output maximum current 200mA;
â— Low power consumption: the power consumption is less than 5mW when the output is no load;
â— Internal integrated LDO circuit: stable output 5V voltage (3.3V/3V), no need to externally add voltage regulator IC circuit
â— Ultra-small volume: L18*W9.5*H15.5m
Single FireWire Switch Application Circuit Schematic:
Component selection:
R1 current limiting resistor, depending on the input voltage range and output current.
For C1 filter capacitors, it is recommended to use 0.47uF-100uF electrolytic capacitors, depending on the input voltage range and output current.
C2 selects 47uF/25V electrolytic capacitor.
C3 output filter capacitor, it is recommended to use 47uF-220uF.
Z1 does not exceed 12V for output modules below 12V; it does not exceed 15V for 12V output modules.
Note: If the quiescent current requirement is relatively strict, it is recommended that C1-C3 should use a capacitor with a relatively small leakage current.
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