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A systematic method is proposed to select desired multi-elements resonant topologies, like three-element, four-element or more elements resonant topologies. The intrinsic characteristics of multi-element resonant converters are utilized for this classification and selection method. Three-element resonant tanks are grouped. One group is chosen for illustration. The characteristics of topologies in...
This paper presents a digital hybrid ripple-based constant on-time control scheme for voltage regulator modules (VRMs). Due to the sampling effects of the digital implementation, the stability issue becomes worse than the analog ripple-based control schemes, especially when low-ESR decoupling capacitors are used as the output filter. In order to stabilize the system and to fulfill the output impedance...
AC-DC converters for low power applications have their unique EMI characteristics compared to the converter for other applications. It has very high DM noise due to the DCM or CRM operation and results in a relatively high transformed CM noise caused by the unbalance of the noise propagation paths. This paper summarized the important unbalanced paths and proposed methods to limit the CM noise caused...
This paper describes the design and implementation of a prototype 30-kW (or 30-kJ/s) pulsed-power supply for capacitor charging. The system operates at 200-kHz maximum switching frequency, which is considerably higher than the conventional practice at this power level, leading to smaller passive components. A high power density of 143 W/in3 is achieved with the converter operating at a high ambient...
This paper characterizes two digital V2 control schemes using for the buck converters with small-ESR capacitors based on the presented small-signal models. Due to the sampling effects of the analog-to-digital converters (ADCs), the digital V2 control system performances are not as good as the analog ones, even using the inductor current sensing feedback. The major issue is that in order to stabilize...
This paper describes the design and implementation of a prototype 30kW, 200kHz pulsed power supply. A power density greater than 100W/inch3 is achieved with the converter operating at a high ambient temperature of 65 ??C, by utilizing various technologies on topology, control, devices, passives, and thermal management, which can help reduce the converter size. The experimental results demonstrate...
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