Methods and configurations of LC combined transformers and effective utilizations of cores therein
First Claim
1. A species of electric transformer, termed LC combined transformer, used for transferring electric signal or energy of periodic sine wave, and proportionally altering the amplitude(s)/magnitude(s) of current or/and voltage of the periodic sine wave between input and output ports when neglecting power loss,being a current type unity-coupled mutual capacitor characterized as current transformation, or a voltage type unity-coupled mutual capacitor characterized as voltage transformation, or a circuit of LC combined transformer in cascade connection of an ideal transformer plus one current type unity-coupled mutual capacitor or two voltage type unity-coupled mutual capacitors, comprisingsaid current type unity-coupled mutual capacitor consisting of three linear capacitances in delta (Δ
- ) configuration with a sum of the reciprocals of said three capacitances being zero;
said voltage type unity-coupled mutual capacitor consisting of three linear capacitances in wye (Y) configuration with a sum of said three capacitances being zero;
either of said unity-coupled mutual capacitors including negative capacitance(s) which may be realized through negative impedance converter(s) (NIC) or by employing linear inductor(s) when operating at a constant frequency;
said circuit of LC combined transformer comprising current transformation-A type LC combined transformer consisting of a mutual inductor (Tr), an inductor (Lb) and a capacitor (Cm), if designating the primary winding terminals of said mutual inductor (Tr) as the input port of said current transformation-A type LC combined transformer, said mutual inductor (Tr)'"'"'s secondary winding and said inductor (Lb) and said capacitor (Cm) being connected in series to form a closed loop before designating the two terminals of said capacitor (Cm) as the output port;
said current transformation-A type LC combined transformer presenting a ratio of current transformation between ports as
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Abstract
The LC combined transformer is a combination of capacitors, inductors and an electrically-isolated mutual inductor, i.e. conventional transformer; which in principle is a unity-coupled mutual capacitor or a cascade connection of an ideal transformer and unity-coupled mutual capacitor(s). To improve the imperfections of widely-used transformers, by employing the simplest passive-circuit design to attain a perfectly-functional match between mutual capacitors and the mutual inductor, this invention achieves optimal features of current or/and voltage transformation, and introduces a new function of waveform conversion from square to quasi-sine. The ideal current transformer herein is suitable for sinusoidal current measurements, the ideal voltage transformer herein suitable for sinusoidal voltage measurements, and they also could be upgraded to ideal transformers for both current and voltage transformations. This transformer can be designed as power transferable as well as waveform convertible, applicable in power systems or power electronics. Herein also states the design approach of integrated inductor and mutual inductor, and the use of push-pull inductor, materials being fully utilized and sizes decreased.
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Citations
4 Claims
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1. A species of electric transformer, termed LC combined transformer, used for transferring electric signal or energy of periodic sine wave, and proportionally altering the amplitude(s)/magnitude(s) of current or/and voltage of the periodic sine wave between input and output ports when neglecting power loss,
being a current type unity-coupled mutual capacitor characterized as current transformation, or a voltage type unity-coupled mutual capacitor characterized as voltage transformation, or a circuit of LC combined transformer in cascade connection of an ideal transformer plus one current type unity-coupled mutual capacitor or two voltage type unity-coupled mutual capacitors, comprising said current type unity-coupled mutual capacitor consisting of three linear capacitances in delta (Δ - ) configuration with a sum of the reciprocals of said three capacitances being zero;
said voltage type unity-coupled mutual capacitor consisting of three linear capacitances in wye (Y) configuration with a sum of said three capacitances being zero; either of said unity-coupled mutual capacitors including negative capacitance(s) which may be realized through negative impedance converter(s) (NIC) or by employing linear inductor(s) when operating at a constant frequency; said circuit of LC combined transformer comprising current transformation-A type LC combined transformer consisting of a mutual inductor (Tr), an inductor (Lb) and a capacitor (Cm), if designating the primary winding terminals of said mutual inductor (Tr) as the input port of said current transformation-A type LC combined transformer, said mutual inductor (Tr)'"'"'s secondary winding and said inductor (Lb) and said capacitor (Cm) being connected in series to form a closed loop before designating the two terminals of said capacitor (Cm) as the output port;
said current transformation-A type LC combined transformer presenting a ratio of current transformation between ports as - View Dependent Claims (2, 3, 4)
- ) configuration with a sum of the reciprocals of said three capacitances being zero;
Specification