In order to achieve high-reliability LEDs with high reliability, small size, high luminous efficiency, low power consumption and low cost, the industry has developed a PSR controller with a high-brightness LED driver solution. The PSR controller's outstanding constant current technology can accurately provide the appropriate voltage and current to improve the life of the LED. In addition, the PSR high integration solution can further reduce the size of the LED driver and PCB, thus starting in the industry. Lu Feng Mang.
The realization of low-power and high-efficiency technologies has attracted global attention. As lighting applications account for nearly 20% of the global power consumption, advances in lighting technology will also have a huge impact on energy conditions. Light-Emitting Diode (LED) Solid-State Lighting (SSL) is an environmentally friendly technology with excellent form factor, long life, high conversion efficiency, and power consumption 80% or 90% lower than conventional incandescent lamps.
In LED SSL, the LED driver plays an important role because it relies on it to provide the precise current needed to maintain a stable brightness. However, conventional LED driver solutions use a secondary feedback circuit to drive the voltage and current of the LED, but the secondary feedback circuit results in increased cost and size.
This article describes a patented primary side regulation (PSR) technology that allows the PSR controller to accurately regulate the voltage and current of the LED driver in the primary side of the transformer without the need for a secondary-side feedback circuit. It also includes frequency jittering to reduce electromagnetic interference (EMI) and light-load standby mode to reduce standby loss. With this approach, PSR chargers can achieve smaller form factors, lower standby power, and higher efficiency than traditional designs such as ringing choke converter (RCC) and traditional pulse width modulation (PWM).
LED lighting has many advantages, but without proper voltage and precise current, the life of these components will not only be shortened, but also the power consumption and heat consumption will increase, which will eventually cause irreparable damage to the LED. Considering that the LED and the ordinary diode also have a large slope of the VI curve in terms of physical properties, the operating voltage of the LED is quite sensitive to the operating current. If the variation is large, the life of the HB LED unit is affected, so the current of the LED is illuminated. Very important. In this case, the PSR with excellent constant current technology is both important and beneficial for the life of the HB LED. LED drivers typically use a non-isolated buck converter or an isolated flyback converter.
In conventional LED control circuits, an off-line constant output current LED driver can be implemented using an isolated flyback converter in conjunction with a secondary side circuit to regulate the output current (Figure 1). Here, the LED current is measured by a Sense resistor Ro on the secondary side and provides the necessary feedback information by means of an optocoupler. The optocoupler forms an isolation between the primary side and the secondary side and couples the feedback signal to the PWM controller on the primary side. To achieve better output regulation, the PWM controller uses the optocoupler to receive the feedback signal on the secondary side. To determine the duty cycle of a metal oxide semiconductor field effect transistor (MOSFET).
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