3results about How to "Reduce circulation loss" patented technology

The invention discloses a resonant dual-active bridge converter and a control method, and the converter comprises a primary full-bridge circuit, a secondary full-bridge or half-bridge circuit, a transformer, and an LC resonant network composed of a resonant inductor and a resonant capacitor which are connected in series. The control method comprises the following steps: acquiring parameters of an input voltage V1, an output voltage V2, a transmission power P, a transformer turn ratio N, a resonant inductance Lm and a resonant capacitance Cr of the converter; and calculating a primary fundamental wave equivalent voltage and a secondary fundamental wave equivalent voltage, and calculating an inner phase shift angle alpha between a first bridge arm and a second bridge arm in the primary full-bridge circuit through the primary fundamental wave equivalent voltage and the secondary fundamental wave equivalent voltage. The LLC converter has the beneficial effects that the inherent defects that the gain range of a traditional LLC converter is narrow (generally only 0.8-1.2) and the circulating current is sharply increased and the efficiency is sharply reduced when the voltage is seriously mismatched in the traditional phase-shifting DAB are fundamentally overcome.

The application relates to a built-in current-limiting reactor, which comprises an upper yoke, a coil and a lower yoke arranged in sequence from top to bottom, wherein the upper yoke is provided with an upper yoke frame, the upper side of the upper yoke frame is provided with an upper connecting seat, the inside of the upper yoke frame is provided with upper silicon steel sheets, the upper silicon steel sheets are insulated from the upper yoke frame and connected with the upper connecting seat, the upper connecting seat is connected with a corresponding upper clamp of a transformer, the lower yoke is provided with a lower yoke frame, the lower side of the lower yoke frame is provided with a foot pad, the inside of the lower yoke frame is provided with lower silicon steel sheets, the lower silicon steel sheets are insulated from the lower yoke frame and connected with the corresponding foot pad, the foot pad is connected with a corresponding lower clamp of the transformer, vertical screw rods are arranged between the upper yoke and the lower yoke, the upper ends of the vertical screw rods are fixedly connected with the corresponding upper connecting seats, the lower ends of the vertical screw rods are fixedly connected with the corresponding foot pads, upper lead wire rows and lower lead wire rows are arranged outside the coil, and the upper lead wire rows and the lower lead wire rows are respectively connected with corresponding low-voltage lead wire rows of the transformer. The built-in current-limiting reactor has lower cost, smaller loss, stronger short-circuit resistance, shortened production cycle and reduced installation space.

This application discloses a DAB converter and its driving control method. The method includes: obtaining the voltage transfer ratio based on the input voltage and output voltage of the DAB converter; obtaining the feedforward power based on the input voltage, voltage transfer ratio, and output current of the DAB converter; obtaining the primary-to-secondary side shift ratio based on the input voltage, output voltage, voltage transfer ratio, input current, and feedforward power of the DAB converter; obtaining the primary-side inward shift ratio and the secondary-side inward shift ratio based on the voltage transfer ratio, feedforward power, and the primary-to-secondary side shift ratio; and driving the DAB converter based on the primary-side inward shift ratio, the secondary-side inward shift ratio, and the primary-to-secondary side shift ratio. This invention optimizes the values ​​of the primary-side inward shift ratio, the secondary-side inward shift ratio, and the primary-to-secondary side shift ratio using relevant parameters of the DAB converter to achieve precise driving control of the DAB converter. By adjusting the control parameters of the DAB converter, the soft-switching range can be expanded, current stress reduced, and light-load efficiency improved, while significantly increasing the system's energy conversion rate.