Dimmable LED driver power supply Harmonic Current design

Due to the commonly used switching technology of LED driving power supply, such products have pollution to power, resulting in a significant reduction in the utilization of power lines. Therefore, IEC-61000-3-2: 2014 requires LED lamps of 25 watts or more to meet harmonic currents (Harmonic current ) standard. At full load or high load, the LED driver itself must have a circuit that can control the harmonic current (Harmonic current) to meet the standard.

Dimmable LED driver power supply Harmonic Current design

Classification of equipment in accordance with EN 61000?3?2: 2014 international standards:

Class A:

Balanced three-phase equipment

Household appliances, excluding equipment listed in category D

Tools, excluding portable tools;

Incandescent dimmer;

Audio equipment

Devices that are not specified as Class B, C, and D are considered Class A devices. For example: frequency converters, cookers, fixed woodworking equipment, lighting dimmers, audio amplifiers, subwoofers, heaters and adjustments.

Class B:

Portable tool

Arc welding equipment that does not belong to special equipment.

For example: drilling machines, electric hammers, portable mining equipment, non-professional arc welding equipment.

Class C:

Lighting equipment. For example: LED lighting, LED street lights and other lighting equipment.

Class D:

The following equipment with a power of not more than 600W;

Personal computer and personal computer display;

Television receiver.

For example: personal computer, tablet computer, notebook computer, TV.

Conducted emissions within the scope of this standard require up to 40 harmonics.

When the LED driver is dimmed, do you still need to meet the requirements of Table 2 of IEC-61000-3-2(2014)? Conclusion: Not required. Reason 1). Today's standard specifications do not limit the harmonic current conditions of LED lamps under dimming, 2). Compare LED-driven power generated by harmonics under full load and light load (dimming) according to market intelligent product analysis. The system loss is calculated. It is found that the power loss under dimming is still lower than the full-load power loss in the specification. The basis of the upper limit value of each harmonic current peak under full load condition can be judged. Therefore, the analysis LED is driven at light load. The conditions do not necessarily meet the Harmonic current harmonic current Table 2 requirements. However, the technological development in the era of intelligent lighting continues to be one of the main topics.

Tongjia Technology, which actively promotes energy-efficient innovation, can provide a high power factor, high efficiency, low harmonic, no stroboscopic, secondary feedback design for power supply design requirements for intelligent dimming - LD7792S/N/ O series products.

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