Wolfowitz Teng Technology Figure Jiangsu Jiangsu choke choke

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. EC4045 ultrasonic power transformer from time tn-1 to tn is the n-th carrier period vt of tn-1 = (n-1) Ts tn = nTs its apex = (n-) Ts therefore two straight isosceles triangle wave vt of Equation: When (n-1) Ts & lt; t & lt; (n-) Ts time, vt1 = 2Vtrifs [t- (n-1) Ts] When the (n-) Ts & lt; t & lt; when nTs, vt2 = -2Vtrifs (t -nTs) set vt1, intersection vt2 and vc are at t = t1 and t = t2, then Vsinsinω1t1 = 2Vtrifs [t1- (n-1) Ts] (1) Vsinsinω1t2 = -2Vtrifs [t2-nTs] (2) by the formula (1), the formula (2) can be obtained Doff = 1-masin (3) Don = masin (4) where: Doff = OFF duty cycle, toff = t2-t1 is OFF time; Don = It was on duty. Formula (4) shows that, when the amplitude modulation to maintain a constant ratio of ma, SPWM high frequency pulse duty cycle Don to the fundamental frequency (modulation frequency) and no phase difference changes sinusoidally. To make the core reset, the volt-second balance transformer core of the law is required (ignoring pressure drop) EE16 industrial electronic form transformer