In this article, a novel soft-switched isolated dc–dc converter topology is proposed that consists of a main power converter using a standard topology, augmented with a resonant power feedback circuit. The power feedback circuit utilizes a fraction of the output power to regulate the input voltage of the main converter. Input voltage regulation proves to be advantageous in applications where wide range of source voltage variations are experienced, such as in photovoltaic microinverters. The operation of main converter with a regulated input voltage results in a near-constant phase-shift angle and a high-frequency current wave shape with a low root mean square value over the entire range of operating conditions. Moreover, the operation with near constant phase-shift angle and the presence of additional resonant current in the feedback circuit extend the range of soft-switched operation of semiconductor devices in the converter. The proposed converter topology and its theoretical analysis is verified through an experimental prototype. 

Novel Resonant Power Feedback DC-DC Converter

In this article, a novel soft-switched isolated dc–dc converter topology is proposed that consists of a main power converter using a standard topology, augmented with a resonant power feedback circuit. The power feedback circuit utilizes a fraction of the output power to regulate the input voltage of the main converter. Input voltage regulation proves to be advantageous in applications where wide range of source voltage variations are experienced, such as in photovoltaic microinverters. The operation of main converter with a regulated input voltage results in a near-constant phase-shift angle and a high-frequency current wave shape with a low root mean square value over the entire range of operating conditions. Moreover, the operation with near constant phase-shift angle and the presence of additional resonant current in the feedback circuit extend the range of soft-switched operation of semiconductor devices in the converter. The proposed converter topology and its theoretical analysis is verified through an experimental prototype.

A phase-shift full-bridge (PSFB) converter is used for various power devices because of its simple control and low switching loss. However, if the balance of the primary side current is not maintained, the magnetizing inductance of the transformer is saturated and can be damaged. Therefore, it is crucial to balance the primary side current through the peak current mode control. During the peak current control mode, subharmonic oscillation occurs when the duty is 0.5 or more. Therefore, it is suppressed by slope compensation. The slope depends on the output voltage. Because it is difficult to change the slope in real time depending on the output voltage, the maximum slope value is selected to suppress the subharmonic oscillation for all values of duty ratio. Nevertheless, when the maximum slope value is used, the response speed is delayed because of overcompensation. To solve these problems, hybrid current mode control that combines both peak and valley current mode control has been proposed. This study proposes a hybrid current mode control method for PSFB converters, while considering the magnetizing current and ineffective duty. When this method is used, subharmonic oscillation does not occur for all duty ratio values and input/output voltage fluctuations.

Hybrid Current Mode Control for Phase-Shift Full-Bridge Converter

PSFB 컨버터(Phase Shift Full Bridge converter)는 다양한 전원장치에 응용되고 있다. 또한 빠른 응답과 1차 측 전류 피 크의 불 평형을 방지하기 위해 PCMC(Peak Current Mode Control)를 적용해야 한다. 하지만 PCMC는 유효 시비율이 0.5 이상 일 때 저주파 발진이 일어나기 때문에 경사 보상 기 법을 이용해 발진을 막아야 한다. 일반적으로 경사보상 기울기 는 최댓값을 사용하기 때문에 전류 명령이 과 보상되며, 무효 시비율 구간을 고려하지 않기 때문에 응답속도가 지연 되는 문 제가 있다. 따라서 본 논문에서는 무효 시비율 구간을 고려한 하이브리드 피크-밸리 전류 밴드 제어를 통해 BUCK 컨버터와 동일한 응답 특성을 가지는 PSFB 컨버터 제어 기법을 제안한 다. 제안하는 기법은 PSIM 시뮬레이션을 통해 검증되었다.

https://www.koreascience.or.kr:443/article/CFKO201920461759562.pdf

Hybrid Peak-Valley Current Band Control for PSFB Converter Without Response Delay

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Hybrid Current Mode Control for Phase-Shift Full-Bridge Converter

Hybrid Peak-Valley Current Band Control for PSFB Converter Without Response Delay