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In order to reduce power consumption of electronic equipment in stand-by mode, idle-mode and sleep-mode, a simple efficiency improvement technique for switching regulator in light load region is proposed. During the light load, small switching elements in a MOSFET driver circuit are used instead of switching elements in a main regulator circuit to reduce switching and driving losses. Of course, during...
This paper presents a new control method for H-bridge buck-boost converter regulated by single voltage feedback and dual feedforward controls. This converter has two pairs of the switch, one acts as a synchronous buck and another as a synchronous boost operations, and therefore is suited for battery powered applications to provide an output voltage that is below or above the input voltage. In order...
The hysteretic PWM control method is one of the fastest control technique for the dynamic response of switching power converters. This paper proposes a practical and robust hysteretic PWM control method by employing an additional capacitor in a comparator circuit. This additional capacitor has a role to enlarge the initial hysteretic window voltage just after turn-on and turn-off of the switching...
A derivative PWM control method with constant switching frequency strong against incoming switching noise is proposed. The triangular voltage obtained from a simple RC network as a comparator input is employed to determine the duty ratio and an external clock signal is used to fix the switching frequency. Applying the proposed method to the buck converter, excellent dynamic performances and stable...
This paper presents a comparative study of frequency analysis algorithms, i.e., State-Space Averaging Method (SSAM) and Fourier Transform Method (FTM) for switching converters. These two methods are reviewed briefly and a circuit simulator is implemented and demonstrated with several circuits, for example, a buck converter as a simple-structured circuit, a tapped-inductor converter as a resonant circuit,...
This paper presents a simulation method for the analysis of switching power converters. In the method, numerical Fourier transform is employed to obtain fast results. A circuit simulator using the proposed simulation method is implemented and demonstrated with a ripple regulator. The simulation results have good agreements with the experiments. The proposed method is applicable to any circuits including...
This paper presents a novel fast simulation algorithm for the frequency analysis of switching power converters. Numerical Fourier Transform is employed to obtain fast results. The proposed algorithm is applicable to any circuits including self-oscillating circuits such as hysteretic PWM converters. A circuit simulator using the proposed algorithm is implemented and demonstrated with a hysteretic PWM...
Analysis and design consideration of the novel three phase converter with new bootstrap driver circuit for the mobile micro processor in the laptop PC are presented. The voltage conversion ratio of the proposed converter is one third of the duty cycle. The voltage across the switches during switching operation is one-third of the input source voltage. The current ripple of the output smoothing capacitor...
We propose a novel multi-phase buck converter with a simple gate drive circuit, which is suitable for mobile microprocessors of lap-top computers. In case of the three-phase construction, the duty-cycle of this converter is extended to three times of that of the typical buck converter because the voltage conversion ratio is given as V0/Vi = D/3. The switching loss and switching stress are reduced...
Operations and steady-state analysis for an improved interleaved forward converter topology are presented in this paper. Not only zero-voltage-switching (ZVS) can be achieved through the resonance that exists between the transformers magnetizing inductances and the parasitic capacitance of switches, but also proper transformer reset and lower output voltage can be achieved by adding two clamp capacitors,...
A novel two-phase buck converter suitable to apply the power supplies for MPU is proposed. Compared to conventional two-phase buck converter, the proposed converter essentially has double step-down ratio as Eo/Ei = D/2 and high efficiency is realized by reducing the switching loss of the switching elements. In addition the current ripple of the output smoothing capacitor is improved to the same value...
In order to provide the power to the microprocessor, a novel two-phase converter with the large step down conversion capability is presented. The voltage conversion ratio of this converter is given as Eo/Ei = D/2. The switching loss and the output voltage ripple are also reduced. Moreover the current unbalance between two inductors in each phase is removed automatically without any current sensing...
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