Journal ArticleDOI
PWM inverter controlled by a small saturable core
K. Harada,H. Sakamoto +1 more
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TLDR
In this article, 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.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.read more
Citations
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Journal ArticleDOI
A novel high power converter for non-contact charging with magnetic coupling
H. Sakamoto,K. Harada +1 more
TL;DR: In this paper, a 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.
Journal ArticleDOI
Steady-state analysis and simulation of a BJT self-oscillating ZVS-CV ballast driven by a saturable transformer
Yueh-Ru Yang,Chern-Lin Chen +1 more
TL;DR: The saturating behavior of driving and switching devices clearly distinguishes this self-oscillating inverter from an external-drive high-quality-factor resonant inverter.
Proceedings ArticleDOI
Non-resonant converter for megahertz switching
Harada Kousuke,Hiroshi Sakamoto +1 more
TL;DR: In this article, a novel method of zero-voltage switching for DC-to-DC converters is presented, based on commutation with the aid of an inductor, where a short interval with both switches off is provided for removing the current surge.
Proceedings ArticleDOI
On the saturable inductor commutation for zero-voltage switching
Harada Kousuke,Hiroshi Sakamoto +1 more
TL;DR: In this paper, a novel method of high frequency switching is presented, where a small saturable inductor is used for zero-voltage switching, and saturated conditions of the inductor are satisfied by the use of a PWM (pulse width modulation) controller with a saturable core.
Journal ArticleDOI
Current sensors with a small saturable core and MOSFETs
Harada Kousuke,H. Sakamoto +1 more
TL;DR: In this article, simple, noncontact-type current sensors for detecting instantaneous value of the current are reported, especially suitable for DC-to-DC converters and uninterruptible power supplies.
References
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Journal ArticleDOI
Modulation of the Chopping Frequency in DC Choppers and PWM Inverters Having Current-Hysteresis Controllers
TL;DR: In this article, it was shown that the chopping frequency of a dc chopper converter depends on the square of the counter EMF of the load, which is a consequence of the fact that three phase currents must sum to zero, rendering one of the three current controllers redundant.
Journal ArticleDOI
An Improved Square-Wave Oscillator Circuit
TL;DR: In this article, a small saturable transformer is used to supply the transistor drive requirements in the improved squarewave oscillator circuit, where the feedback transformer derives its primary power for sufficient positive feedback from the output circuit either as a voltagedependent signal, a current dependent signal, or a combination of both.
Journal ArticleDOI
On the High-Speed Turn-Off of a Power Transistor by a Small Saturable Core
TL;DR: In this article, an efficient dc-dc converter operating at the megahertz region is presented, where the turnoff time is shortened by using the current feedback and the core saturation.