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This paper describes a power loss analysis of a proposed tapped-inductor buck converter which suitable for home DC power supply system. A laboratory prototype of a coin size (34mm × 26mm × 5mm) with DC 48V input to 1.2V/30A output was built and tested to verify the accuracy of the loss analysis. As a result, about 90% efficiency under middle and heavy load region can be achieved at 500kHz switching...
This paper discusses suitability of a novel tapped-inductor converter for home DC power supply system. Advantages such as high efficiency, compact size, low cost and high reliability are achieved by the characteristics like the buck converter. A laboratory prototype of a coin size (34mm × 26mm × 5mm), which can convert the voltage from 48V input to 1.2V/30A output, was tested. As a result, maximum...
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...
In order to have a power supply with high voltage conversion ratio for low voltage and high current digital ICs, this paper presents a new two stage converter combined with a coupling capacitor. A bottom switch of the first stage is removed and the switching nodes of the first stage and the second stage are coupled together by the coupling capacitor. The steady state analysis is performed and the...
A partial-resonant tapped-inductor converter with an auxiliary switch is proposed. The circuit construction is the same as a conventional tapped-inductor converter with active clamp circuit, but the drive timing for the auxiliary switch is different from the conventional one. As a result the output stability is improved as compared with the conventional active clamp one. Furthermore, zero current...
In this paper, a novel multi-stage converter with a coupled-inductor is presented in order to reduce the ripple currents in the switches and the output capacitor. The operating principle is described in detail and the steady state analysis is performed for a 12 V to 1.5 V prototype buck converter. From the experiments, it is confirmed that ripple currents in switches are greatly reduced and power...
A novel tapped-inductor converter which has similar characteristics to a typical buck converter is proposed. A high step-down conversion ratio is achieved, and the magnetic core size of the tapped-inductor is minimized. The high side switch is easily driven by a usual driver IC without a pulse transformer. The over voltage load protection is inherently realized without any additional components. Furthermore...
A new control method for boost and buck-boost converters employing a hysteretic PWM controller is presented. The triangular voltage obtained from a simple RC network connected to an auxiliary winding of the inductor is superimposed to the output voltage and fed to a hysteretic comparator as a feedback signal. The presented control method provides no steady-state error voltage on the output and excellent...
Analytical and experimental considerations on the large-signal transient-responses of the buck-type switching regulator are described. The behavior under the large-signal operation is defferent from the case of small signal because of the satulation characteristics of the PWM feedback controller. The effect of this nonlinearity is analyzed by deviding its operation into three modes. As a result, the...
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