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ABSTRACT: 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 divided power distribution system with the proposed tapped-inductor converter is discussed for supplying the power to the digital applications
Power Electronics Specialists Conference, 2006. PESC '06. 37th IEEE; 07/2006
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ABSTRACT: 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 as that of conventional four-phase buck converter. Moreover the current unbalance between two inductors in each phase is removed automatically without any current sensing means. The above fine characteristics are simply achieved an additional capacitor
Telecommunications Conference, 2005. INTELEC '05. Twenty-Seventh International; 10/2005
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ABSTRACT: In this paper, we describe the complete operating principle and theoretical analysis of non-contact charge system of an inductive coupler transformer.
Magnetics Conference, 2003. INTERMAG 2003. IEEE International; 05/2003
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ABSTRACT: A novel non-contact battery charger of high power of high
efficiency using a self-oscillated soft-switching converter and a high
power detachable transformer is proposed. The starting of the
oscillation, the stabilizing of the bias voltage and also the
soft-switching are obtained by a simple driving circuit which is made of
diodes and resistors. Using this converter, we have obtained a
non-contact-type battery charger of 98% efficiency, under the condition
of 1 kW output
IEEE Transactions on Magnetics 12/1994; · 1.36 Impact Factor
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ABSTRACT: In the high power DC-DC converter and DC-AC inverter, the
soft-commutated PWM technique has been receiving much attention from the
viewpoints of decreasing the switching noise, reducing the switching
power loss in the main power switch and removing the complicated snubber
circuit and so forth. However, the conventional soft-commutated PWM
converter and inverter have some defects such as high voltage and/or
high current stresses on the switches, the necessity of the additional
switches for realizing soft-commutation, and the relatively large power
loss caused by the large circulating current composed of the load and
resonant ones. This paper presents an improved half-bridge type
soft-commutated PWM inverter, in which an AC current transformer and an
additional resonant capacitor are employed to realize the
soft-commutated PWM operation of the switches and to decrease the
circulating current. Consequently, in the proposed circuit. the power
loss caused by this circulating current is sufficiently reduced. The
operation performance characteristics of this soft-commutated PWM
inverter are analyzed
Power Electronics Specialists Conference, PESC '94 Record., 25th Annual IEEE; 07/1994
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ABSTRACT: The soft-commutated PWM inverter is very attractive for high power
applications. In the conventional soft-commutated PWM inverter, however,
there exist some deteriorative problems such as high voltage and/or high
current stresses on the switches, the necessity of the additional
switches for realizing soft-commutated PWM, and the relatively large
power loss caused by the large circulating current composed of the load
current and the resonant current. This paper presents a new
soft-commutated PWM inverter, in which an AC current transformer and a
main resonant capacitor are used to detect the value and the polarity of
the AC load current, and to realize the soft-commutation of the switches
without causing the above deteriorative problems. The operation and the
characteristics of this soft-commutated PWM inverter are analyzed and
its usefulness is confirmed by experiments
Industrial Electronics, Control, and Instrumentation, 1993. Proceedings of the IECON '93., International Conference on; 12/1993
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ABSTRACT: A converter using a self-oscillated class C converter for
noncontact charging of the rechargeable cell with electromagnetic
coupling is proposed. The oscillating condition of the circuit matches
the condition of the transformer, the output voltage is always
sinusoidal, and the noise of the circuit and the core loss of the
transformer due to harmonics are small. The oscillating condition as a
class C converter is automatically adjusted by a simple bias circuit
which is composed of a diode and a resistor
IEEE Transactions on Magnetics 12/1993; · 1.36 Impact Factor
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ABSTRACT: A method of high-frequency switching is presented. In this method,
a small saturable inductor is used for zero-voltage switching. The
saturating condition of the inductor is controlled by a PWM (pulse-width
modulation) controller with a saturable core or a current transformer.
The zero-voltage switching for removing the switching losses and the
switching noises is realized without increasing the conduction loss due
to the resonant current. A DC-to-DC converter of 90% efficiency with
1-MHz switching frequency was obtained using this method
IEEE Transactions on Magnetics 10/1990; · 1.36 Impact Factor
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ABSTRACT: A sinusoidal PWM inverter with MOSFETs controlled by an extremely small magnetic core is presented, which is simple and of high efficiency under high frequency switching. The circuit is based on the principle of the transistor core multivibrator. However the saturable core is used for PWM in the gate drive circuit. This inverter is especially suitable for small UPS system.
IEEE Transactions on Magnetics 10/1987; · 1.36 Impact Factor
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ABSTRACT: An effective method of separating fine magnetic and non-magnetic materials by a dry-type magnetic separator is presented. The principle is based on the combined effect of AC and DC magnetic fields. The separation is achieved by successive scatter and scalelike agglomeration of particles, over DC poles and on AC poles, respectively. The particle behavior is explained by the function of the intensity of AC and DC magnetic fields and magnetic properties of the materials. When the segregated copper is separated from iron powders, the separation efficiency is improved to 88 - 91% with the proposed method, from 81 - 83% with a conventional one.
IEEE Transactions on Magnetics 12/1982; · 1.36 Impact Factor
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ABSTRACT: New energy-storage dc-dc power converter is presented which provides multiple regulated and isolated dc output voltages. The conventional converter circuits have some defects. In the step-up-down type circuit, the operation is easy to be unstable when the feedback loop gain and/or the total output power grows larger. Meanwhile, although the operation of the step-down type circuit is stable, the extraordinary phenomena arise when the magnetomotive force of the energy-storage reactor is discontinuous for the light-load. These phenomena may be eliminated by the use of a dummy load or the reactor of sufficiently large inductance, but it makes the efficiency lower or the size and weight of the reactor larger. In the converter circuit presented here, the operation is stable and the extraordinary phenomena are eliminated by using the magnetic coupling among the multiple windings of the reactor. Hence, the dummy load can be removed and the inductance of the reactor can be made smaller.
IEEE Transactions on Magnetics 10/1978; · 1.36 Impact Factor
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ABSTRACT: A new core-transistor multivibrator for firing a thyristor inverter is presented. In the multivibrator introduced here, we conserve size, weight, and power by use of a pulse modulated supply instead of a continuous dc supply. The frequency can be controlled over a wide range by changing the volt time integral of the pulse train. A phase locking technique is developed to prevent fluctuating frequency errors which might otherwise occur in the output.
IEEE Transactions on Magnetics 10/1975; · 1.36 Impact Factor
