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# The steady-state operation waveforms of the DTRC. Interval 1 (t 0 -t 1 ) (Figure 3a): Before t 0 , switches M B and M D were conducted. At t = t 0 , M B is turned off and M A is turned on. The current flows through d A . The resonant current i r is negative and increases gradually. On the secondary side, the resonant current flows through diodes d 2 and d 3 ; therefore, the voltages v xz = +V H /2, v yz = −V H /2, v mn = −V L . This interval ends when M D is turned off and M C is turned on. Interval 2 (t 1 -t 2 ) (Figure 3b): In this interval, M D is turned off and M C is turned on. The resonant current i r is constantly negative and gradually increasing. Meanwhile, it flows through diodes d 2 and d 3 . Therefore the voltage v mn = −V L . The currents flow through d A and d C on the primary side. The mid-point voltages v xz = +V H /2, v yz = +V H /2. This interval ends when i r reaches 0. Interval 3 (t 2 -t 3 ) (Figure 3c): Compared with Interval 2, the resonant current changes the polarity in this interval. It increases from 0 to positive and flows through diodes d 1 and d 4 . The switch currents become positive and flow through M A and M C , so the voltages v xz = +V H /2, v yz = +V H /2, v mn = +V L . This interval ends when M A is turned off and M B is turned on. Interval 4 (t 3 -t 4 ) (Figure 3d): This interval begins when M A is turned off and M B is turned on forcibly. The current is shifted from M C to d B , which enables the zero-voltage turn-on of M B . There is no change on the secondary side except for a gradual decrease in the resonant current. The voltages v xz = −V H /2, v yz = +V H /2, v mn = +V L . This interval lasts until M C is turned off and M D is turned on.

Source publication

This paper presents the operation, analysis, design, simulation, and experimental results for a proposed Dual-Transformer DC-DC Resonant Converter (DTRC). A three-arm bridge is employed on the input side and an H-type bridge is employed on the output side of the DTRC, and the two bridges are connected with two high-frequency (HF) transformers. By o...

## Contexts in source publication

**Context 1**

... turns ratio of T 1 is n 1 : 1, while T 2 is n 2 : 1. The steady-state operation waveforms of the DTRC are shown in Figure 2. Fixedswitching-frequency gating signals with 50% duty cycle are given to switches M A ∼M D . ...

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