Question 1

What are the two types of LED drivers?

Accepted Answer

LED drivers are classified into constant voltage LED drivers and constant current LED drivers based on their output characteristics and the method of supplying power to the LED load. The core difference lies in whether the output voltage or output current remains constant. Depending on whether the drive power supply passes through components such as transformers, LED drivers are classified into isolated and non-isolated LED drivers. The core difference is whether there is electrical isolation between the input circuit and the output circuit, which is closely related to safety.

Question 2

UL Class 1 or UL Class 2?

Accepted Answer

UL Class 1 and UL Class 2 differ significantly in terms of safety features, output parameters, and wiring requirements:

Safety Features: Class 1 has a wider output range and typically operates at higher voltages, posing risks of electric shock and fire, necessitating safety protection measures; Class 2 complies with UL 1310 standards, with its output considered safe to touch, posing no risk of fire or electric shock.

Output Parameters: Class 2 operates at a voltage below 60V in dry environments and below 30V in humid environments, with an output current below 5A and power below 100W. Based on the provided circuit voltage, it is divided into three voltage ranges: 0-20 VDC, 20-30 VDC, and 30-60 VDC. Each range has specific requirements for the maximum rated values (volt-amperes, amperes) and maximum output current. In contrast, Class 1 has no restrictions on voltage, current, or power.

Wiring requirements: Class 1 wiring must comply with the National Electrical Code (NEC) requirements for power circuits; Class 2 wiring requirements are relatively lenient, allowing the use of smaller gauge wires and connectors.

Question 3

What’s SELV?

Accepted Answer

SELV stands for Safety Extra Low Voltage, which refers to a power supply and its associated circuit that limits the voltage and current to reduce the risk of electric shock and fire hazards. According to IEC standards, under normal conditions, the maximum contact voltage is 50 VAC or 120 VDC without ripple. Under special conditions (such as humid environments), the maximum contact voltage is 25 VAC or 50 VDC without ripple. If the circuit is not SELV, there are no specific requirements. As mentioned in the text, even the output is not SELV, the design requirements for creepage distance and electrical clearance are lower when using an isolated power supply. This is because an isolated power supply uses an isolation transformer, which prevents electrical connection between the primary and secondary sides, thereby further ensuring safety.

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Isolated and non-isolated LED driver, what’s the difference?

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LED Street Light

Solar Street Light

Led Flood Light

Solar Flood Light

LED High Bay Light

High Mast Light

LED Traffic Light

LED Tunnel Light

LED Garden Light

LED Canopy Light

Led Bollard Light

Lighting Accessories

Smart Systems

Simulation Design

Smart Financing