This paper proposes an integrated magnetic dc-dc converter suitable for high input voltage application. The is based on a coupled input-series and output-parallel dual interleaved Flyback concept. All the center outer legs are gapped, transformers into one core with not so tight coupling. gap beneficial suppressing current spike caused by mismatch between windings. two inversely coupled, ripple reduction can be achieved coupling design. A prototype 350-450-V 24-V/4-A output built....

This paper presents a new subharmonic analysis for buck converters with constant on-time control and ramp compensation. For control, oscillation can be eliminated by adding compensation fixed slope during the off time level on time. Based inductor current information, ramp, charge variations of output capacitor, minimum amount to avoid is derived, effect circuit propagation delay quantified. A prototype converter built using Experimental results demonstrate detailed theoretical analysis.

This paper presents a fully soft-switching resonant forward converter, whose primary side adopts an active-clamp structure to achieve adjustable on-time of the main switch, and secondary boost switch boost-type voltage gain regulation high efficiency. Based on proper parameter design, across capacitor, as well drain-source can decrease zero each cycle, allowing switching for switch. Therefore, penalty associated with widened range is alleviated. To further improve efficiency, two...

This paper proposes a new dual interleaved active-clamp forward topology suitable for high input voltage and high-density application. Two circuits are connected in series on the primary side parallel secondary side. Therefore, only two high-voltage MOSFETs needed switches. Also, parts utilize auxiliary windings to share one capacitor fulfill active-clamp. Charge balance of channels is, thus, regulated by shared clamping without demand extra control schemes. Through resonance between...

This article proposes a scheme to achieve improved efficiencies for standalone photovoltaic (PV) system. Specifically, combined three-port LLC structure is utilized adaptively regulate the power sharing between PV and energy storage battery. fulfilled by adjusting equivalent resonant conditions of two phase-controlled tanks through shared capacitor. Thus, overall efficiency simultaneously reducing conversion stages optimizing converters with fixed-frequency operation. Because an extra flow...

This brief proposes a new topology combination scheme to improve the power efficiency of standalone photovoltaic system as well achieving benefit cost reduction. Instead traditional approaches directly utilizing multiple converters, proposed combines an isolated dc-dc converter with battery charging by sharing bridge connection. Thus, simpler structure is utilized, and higher achieved especially when operates at discharging mode. In additional detailed theoretical analysis, experimental...

The power supply system of diesel generators is isolated. Sudden loading and unloading will lead to fluctuation the engine speed exert an impact on quality. In order improve stability against impact, this paper proposes a flywheel with variable moment inertia, through adjustment which, can be improved. Imbalance between output torque load cause changes in inertia flywheel. forms internal feedback loop control system, it takes Angular acceleration as input signal its reduces pulse loading....

This study presents new sub-harmonic analysis for constant on-time control with ramp compensation. Ramp compensation of can be fulfilled by either directly feeding back a sensed inductor current signal as an internal or using external fixed slope during the off time and level on time. Based information charge variations output capacitor, mechanism is analysed in detail Also, well explaining benefits signal, effects are quantitatively compared. It revealed that requires lower to avoid...

This study presents a concept of connecting two-stage DC–DC converters in an input-series connection. An application example is discussed detail where the first stage utilises two series connected buck that have reduced voltage stress. A single second half-bridge converter and able to regulate charge balance stage. The benefits topology include: primary switch stress, simple self-driven synchronous rectification for wide input range, self-voltage balancing on intermediate bus capacitors...

Constant on-time control has been widely used for power supply controllers in industry due to its fast transient response. However, existing stability analysis literatures can only explain conditions with single type of output capacitor and usually recommend high equivalent series resistance ( ESR) * <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Co</i> stable operation. This paper proposes a new constant combined capacitors, which are often...

This letter proposes a simple and low-cost scheme to soft switch an isolated converter. The new circuit merges resonant forward converters flyback by using shared power transformers primary switches. Specifically, the mode operation fulfills soft-switching for switches, resets directly delivering energy output. also allows us lower ratio between leakage inductance magnetizing inductance. Thus, main attraction is that simpler structure utilized regulate output voltage converter with constant...

This paper explores the subharmonic oscillation mechanism for constant on-time control, which has been widely used power supply controllers in industry. As well as analyzing stability criterion, this research reveals that circuit propagation delay (Δ <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">t</i> ) can significantly increase demand of xmlns:xlink="http://www.w3.org/1999/xlink">ESR</i> · xmlns:xlink="http://www.w3.org/1999/xlink">C</i> <sub...

This paper proposes a topology combination scheme to achieve wide-range operation for LLC resonant converters. Instead of directly adding an auxiliary current injection circuit each individual converter, the proposed combines two converters through coupled resonance. Then, one can be utilized adjust equivalent parameters other circuit. By only controlling phase delay between mosfet bridges, output voltage regulation is properly maintained without changing switching frequency. Since total...

This paper proposes a new self-driven synchronous rectification scheme for dc-dc converters with symmetrically driven transformers and wide input voltage range. The driving signals are obtained from the output inductor. Two auxiliary switches utilized to turn off main properly. extra switches, which controlled by delayed signal inductor, added avoid undesired gate discharge. approach can achieve high efficiency is suitable practical applications. Experimental results based on 36-75 V input,...

This paper proposes an adaptive compensation scheme for buck converters with ripple-based constant on-time control in order to eliminate the sub-harmonic oscillation. In comparison traditional ramp approaches, new reduces required avoid oscillation by alternating cycles provide compensation. Also, more importantly, amplitude of is adaptively adjusted according feedback off-time difference. minimizes at steady state, and thus, impact on transient response. addition theoretical analysis,...

LLC techniques have been popular solutions for high density power converters due to the benefits of soft switching and no reverse recovery losses. But need frequency control output voltage regulation is always a considerable challenge practical design. This letter proposes simple low-cost scheme suppress variation resonant with wide range operation. An auxiliary circuit, which only deals relatively lower current, utilized regulate by providing an adaptive current injection capacitor. Then,...

This brief proposes a combined topology achieve duty ratio control for resonant forward converter. Instead of directly cascading boost converter with converter, the new circuit simultaneously fulfills voltage step up and isolated power conversion by using shared MOSFET diode. The main attraction is that simpler structure utilized to performance feature two-stage circuit, higher efficiency achievable due reduced stages losses. Then, output regulation properly maintained controlling ratio,...

This letter proposes a new frequency optimization scheme for LLC converters with adjustable energy transferring time. The output voltage is regulated by simultaneous adjustment of the resonant time and switching frequency. Meanwhile, concept adaptive current injection borrowed to solve problem difficult control regulation when only narrow range allowed. Therefore, in comparison that keeps constant, does not add any additional circuit. advantage higher power efficiency achievable, since...

This paper proposes a LLC type resonant forward converter using adjustable turning-off time control for low power and voltage applications. The new circuit is derived from the conventional converter, it has simple structure while maintaining decent soft-switching characteristics. switching losses are reduced by ZVS (zero switching) ZCS current switching). Also, regulation of output does not require small ratio between magnetizing inductor inductor, so leakage transformer can be utilized...

This paper proposes to utilize the internal solar cell diffusion capacitance and module wire parasitic inductances replace input capacitor filter inductor in boost derived DC-DC converters for energy harvesting applications. High switching frequency (MHz) hard switched resonant are proposed. Analysis, simulation experimental prototypes presented. A specific proof-of-concept application is especially tested foldable photovoltaic (PV) panels, which known their high inductance. The successfully...

For modern navy electric ship, the application of multiple shunt active power filters (SAPF) has become an attractive choice to mitigate current distortion nonlinear loads. Multiple SAPF advantage high capacity and reliability. Based on introduction SAPF, this paper analyzes importance paralleling in ship systems. A new approach is proposed compared with several known paralleling/cascading methods. The method separates tasks compensating for reactive harmonic currents. It fast response...

Synchronous rectifiers are widely used in low voltage and high current DC/DC converters to reduce conduction power loss. For popular reliable topologies, such as Half-bridge, Push-pull Phase-shifted Full-bridge, the application of self-driven synchronous rectification has design challenges due existence dead times. Existing solutions not suitable for wide input ranges. This paper presents a new scheme which properly combines signal from transformer output inductor drive MOSFETs. method...

In order to improve the reliability of Bearingless Switched Reluctance Motor (BSRM), this paper develops mathematical model and compensation control radial forces for 12/8 dual-winding BSRM when a levitation winding is short-circuited. Firstly, based on normal BSRM, short-circuit current derived force with fault also established. After that, models are verified by finite element analysis (FEA). Meanwhile, in obtain continuous levitation, compensated extending conduction previous energized...