AC power without power transistor switching circuit

An AC-DC power supply without a power switching circuit is typically employed in lighting load circuits. When the power grid is restored, the standby power supply automatically switches on. The automatic switching circuit utilizes a transistor, as illustrated. The automatic switching time is less than 1 second. Figure (a) depicts a direct current (DC) 12V standby power supply; Figure (b) represents a DC 24V standby power supply; and Figure (c) shows an AC backup power supply.

The described AC-DC power supply system is designed to operate efficiently in lighting applications, ensuring seamless transition between the main power source and the standby supply. The absence of a power switching circuit indicates that the system relies on a straightforward design that minimizes complexity and potential points of failure.

The automatic switching mechanism is crucial for maintaining uninterrupted power to lighting loads, particularly in scenarios where power outages are common. The use of a transistor in the switching circuit allows for rapid response times, with the automatic switching time being less than 1 second. This quick response is essential for applications where immediate restoration of lighting is required, such as in emergency lighting systems or critical infrastructure.

The schematic representation includes three figures, each tailored to specific voltage requirements. Figure (a) illustrates a 12V DC standby power supply, which is suitable for low-voltage lighting applications. Figure (b) shows a 24V DC standby power supply, which may be used in systems requiring higher voltage for more extensive lighting setups. Finally, Figure (c) incorporates an AC backup power supply, capable of providing alternating current to lighting loads that are not compatible with direct current.

Overall, this power supply design emphasizes reliability and efficiency, making it appropriate for various lighting applications where maintaining power continuity is essential. The choice of components, particularly the transistor for automatic switching, reflects a careful consideration of performance and operational requirements in real-world scenarios.AC-DC power supply without power switching circuit normally used for lighting load circuit, once the power grid or power is restored, the standby power supply automatic switching immediately. Automatic switching circuit using a transistor as shown, the automatic switching time less than Is. Figure (a) applies to straight stream 12V standby power supply; Fig. (B) for DC 24V standby power supply; FIG. (C) For AC backup power.