Design and Implementation of an Accurately Regulated Multiple Output ZVS DC–DC Converter

Abstract

An accurately regulated multiple-output zero-voltage switching (ZVS) dc-dc converter is proposed. The converter is composed of three outputs altogether. The first and second outputs are regulated through the duty cycle control of two asymmetrical half bridge converters, while the third output is regulated through the phase shift of the two asymmetrical half bridge converters. The characteristic of this multiple-output dc-dc converter is analyzed and design process is investigated. ZVS is realized for all the main switches. Therefore this multiple-output dc-dc converter can operate with higher efficiency at higher switching frequency. The operation stages, ZVS condition and control detail are also presented. A 400 V input, 48 V/10 A, 5 V/20 A, 12 V/5 A outputs prototype is built to verify the design. The efficiency at rated input voltage full load is 93.36%.

Multiple-output DC-DC converters with the shared leg structure: Basic topologies, ZVS analysis and experimental results

“…Based on (a-1), the dual-output converters with PFM-PS modulations have been presented in [7,8]; furthermore, if both the legs in a ZVS-FB converter are shared by two HBs, three outputs can be obtained. A triple-output converter with PWM-PS-PWM modulations has been presented in [9], and a triple-output converter with PWM-PS-PFM modulations has been presented in [10]. One leg in two ZVS-FB converters can be shared, as shown in (a-2) (see Table I).…”

“…4) Voltage regulation ability: As mentioned, the crossregulation always exists in the PR-type converters. In the shared leg topologies, the regulation of the HB parts will only slightly affect the FB part [8,9,13], and the regulations of the FB parts are completely independent. 5) Efficiency performance: the conducting loss in the PRtype converters is high because the power of the additional outputs is processed by the primary-side switches and then by the PRs again; while in the shared leg topologies, the power …”

“…Based on the shared leg concept, several new multiple-output converters have been presented [7][8][9][10][11][12]. However, all the previous works focus on a certain shared leg structure, the overall performance of the shared leg topologies hasn't been evaluated, the general characteristics haven't been discussed and the inherent relations among these shared topologies haven't been exposed yet.…”

The cost-efficient, full ZVS range hybrid full-bridge-half-bridge family with shared lagging leg: Topology derivation, optimization design and experimental results

“…[4] presented a new PSFB converter, whose legs are also structured as two asymmetrical HB converters to provide three regulated outputs, and the ZVS range of the legs is partly extended; [5] used the PSFB's two legs to form two resonant LLC HB converters in parallel, the ZVS of both legs are extended to full range; [6] pointed out that, since only the lagging leg of the PSFB is difficult to achieve ZVS, using the lagging leg to form a LLC HB converter would be more cost-efficient; with this similar concept, [7] and [8] proposed two kinds of SLL converters which achieve full ZVS ranges and high efficiencies.…”

A Tightly Regulated Triple Output Asymmetrical Half Bridge Flyback Converter

“…An asymmetrical half bridge converter with PWM-PD control has been studied [3]. Although the output voltages are well regulated, the input voltage range is narrow and auxiliary circuitries are required for the third output.…”