Application of Super Junction MOSFET in Lighting Power Supply

1、Lighting Power Supply

Lighting is a method of using multiple light sources to illuminate a work, living place, or specific object. According to the source of the light source, it can be divided into two categories: those that use natural light sources such as the sun and the sky are called "natural lighting"; The use of artificial light sources is called "artificial lighting".

The primary goal of lighting is to create a good visual visibility and a comfortable and pleasant environment with sufficient illumination to meet people's needs (general lighting), emphasis on specific features for identification (road lighting, advertising signs, etc.), emphasis on buildings (architectural lighting, accent lighting, etc.), creating a comfortable light environment (home lighting, etc.), creating a specific atmosphere (commercial stage lighting), and meeting other special purposes (biochemical experiments, medical treatment, plant cultivation, etc.).

After entering the 21st century, white LED has developed rapidly, and its energy-saving lamp luminous efficiency has been greatly improved, far exceeding traditional incandescent lamps, and gradually approaching fluorescent lamps. With the further development of material technology, chip size and appearance technology, the luminous flux of commercial LED lamps has increased dozens of times. The faint luminescence of LEDs in the past is heralding a new era of LED lights.

LED (Lighting Emitting Diode) lighting is an illumination technology that uses light-emitting diodes, which is a semiconductor solid-state light-emitting device. LEDs utilize solid-state semiconductor chips as light-emitting materials, and when carriers in semiconductors are compounded, excess energy is released, resulting in photon emission. These photons directly produce red, yellow, blue, and green light. Based on the principle of three primary colors, LEDs can emit light in various colors by adding phosphors.

2、Market Analysis

In recent years, China's LED lighting and drive power supply market has continued to expand, showing strong growth momentum. According to the latest data, the scale of China's LED lighting market in 2024 has reached about 811 billion yuan, with an output value of about 716.9 billion yuan, and is expected to exceed 820 billion yuan in 2025, with an average annual growth rate of stable growth. The LED driver power supply market also performed well, with a scale of 38.4 billion yuan in 2024, a year-on-year increase of 7.87%, and is expected to further climb to 51.7 billion yuan in 2025, accounting for more than 35% of the global market. This growth is mainly due to the maturity of LED technology, cost reduction and increased penetration rate of downstream applications, superimposed policy support and driven by green lighting demand, the industry is accelerating its transformation to intelligent and high-end, and the market size is expected to continue to expand in the future.

3、Product Application and Advantages

Low-power LED topology without PFC

The AC-DC conversion and LED driver circuitry are integrated, both located in the luminaire, eliminating the need for linear or DC-DC converters integrated in the LED light strip. This monolithic approach has fewer power conversion segments, reduces the number of components used (e.g., optics, LEDs, electronic components, printed circuit boards, etc.), lowers system costs, and supports higher overall energy efficiency of LED power supplies.

The low-power LED driver power supply adopts a single-stage PSR flyback circuit, which requires the HV MOSFET to have good EMI characteristics and strong EAS capabilities.

Share a case: 28W LED power supply surge improvement case study

Power Specifications:

-90~265VAC/50Hz

-28-40 VDC,700mA

- AC input Surge :1200V DM

整改前surge current waveform before rectification(220Vac,1300V/90°）

Surge Improvement Measures

surge current waveform after rectification（220Va1300V/90°）

Low-power LED topology with PFC

A common power architecture in high-power LED area lighting applications is a three-stage architecture of "power factor correction (PFC) + constant voltage (CV) current (CC)". The design of this architecture provides a modular path to field upgrades, with the flexibility to change the number of LED light strips according to actual needs, thereby increasing or decreasing the light output to meet the requirements of specific area lighting applications. In this architecture, the AC-DC conversion is not integrated with the LED driver circuitry, but is configured in a distributed configuration that simplifies safety considerations and enhances system flexibility, also known as a distributed solution, with typical applications such as linear and trunking lights.

PFC+QR flyback, the first level PFC circuit, requires small internal resistance, when the circuit starts, the impulse current is large, and the MOSFET is required to have strong EAS ability; The primary MOS requires that the speed of the switch is moderate and the EMI characteristics are good.

High-power PFC+LLC  LED Topology

There is a growing interest in ultra-energy-efficient LED lighting topologies that offer high energy efficiency (e.g., >90%) in higher-power 100 W to 250 W LED area lighting applications. To provide such high energy efficiency, energy-efficient power supply topologies such as resonant half-bridge dual-inductor plus single-capacitor (LLC) topologies are required to take full advantage of zero-voltage switching (ZVS).

PFC+LLC topology, the first-level PFC circuit, requires small internal resistance, large impulse current when the circuit starts, and requires the MOSFET to have strong EAS capability; The post-level LLC resonant circuit requires the body diode of the MOSFET to have strong di/dt capability and a small Qrr.

LED lighting market application, Lonten Semiconductor's high-voltage SJ MOS, its product advantages:

For PFC topology, EAS is optimized to enhance avalanche resistance and surge resistance.

For QR flyback topology, optimize the switching speed, making it easier to pass EMI testing;

For LLC topology, the body diode is optimized to enhance di/dt capability and reduce Qrr and drive interference.

Optimize the ratio of Qg and Coss/Ciss, reduce drive loss, and improve drive anti-interference ability.

Note: The above data is from Lonten Semiconductor, please indicate the source for reprinting.