Wolfowitz Teng Technology Jiangsu choke choke supply

Circuit works 2.1 System components The system consists of dual modular single-ended flyback converter, two-way high-frequency rectifier, high frequency filtering and control components. Double modular single-ended flyback converter is essentially share a transformer core and two single-ended flyback secondary side, the control signal vc positive and negative half cycles respectively by vg1, vg2 the control of the chopper operation, complete transformer, isolation, power transfer tasks. Two-way high-frequency rectifier FET instead of general flyback diode in the secondary side. Two FETs are controlled vg3, vg4 in the low-frequency signals of positive and negative half-cycle time-sharing is turned on, and interact with each other via the body of parasitic diodes bidirectional frequency rectifier. Two-way high-frequency rectified get a list of bipolar pulse, the column pulse envelope waveform control signal vc is similar to the same frequency, different amplitudes, after high frequency filtering, obtained with the frequency of the output voltage vc. The control section generates a low-frequency control signal vc the same frequency, phase difference (Tc periodic waveform vc) ??double-row unipolar SPWM frequency pulse vg1, vg2 and dual low-frequency switching pulse vg3, vg4, control the double combination single-ended flyback converter and a two-way high-frequency rectifiers, and real-time feedback through the output voltage change AM depth ma SPWM high frequency pulse train to achieve converter output voltage regulation. 2) the cost of life and the power supply and LED driver circuit lifetime EC4045 ultrasonic power transformers, although single LED itself life of up to 100,000 hours, but it must be used with the application of power conversion circuits, so the overall life of LED lighting must be from the photo integration of applications to be considered. But lighting with LED, to achieve the matching requirements, lifetime supply of the driver circuit must be more than 100,000 hours, it is no longer a bottleneck factors led lighting system. In considering the long life while they can not increase too much cost, lifetime and cost of the power supply and the drive circuit is usually not more than one-third of the total cost of the lighting system, led lighting products in early development, it must strike a balance between supply and Life expectancy and the cost of the drive circuit.