Switching power supply device
First Claim
1. A switching power supply device, comprising:
- a transformer including at least a primary winding and a secondary winding;
a primary side circuit includinga primary side resonant inductor formed so as to be equivalent to and in series with the primary winding,a primary side resonant capacitor forming, together with the primary side resonant inductor, a primary side resonant circuit, anda primary side alternating current voltage generation circuit including at least two switching elements and configured to generate a trapezoidal wave alternating current voltage from an input direct current power supply voltage and to provide the trapezoidal wave alternating current voltage to the primary side resonant circuit; and
a secondary side circuit includinga secondary side resonant inductor formed so as to be equivalent to and in series with the secondary winding,a secondary side resonant capacitor forming, together with the secondary side resonant inductor, a secondary side resonant circuit, anda secondary side rectifying circuit including a rectifying element and configured to rectify an alternating current outputted from the secondary side resonant circuit to obtain a direct current voltage,wherein a mutual inductance is formed equivalently through mutual induction between the primary winding and the secondary winding;
a mutual capacitance is formed equivalently through interaction between the primary winding and the secondary winding; and
a multi-resonant circuit is formed that includes a plurality of LC resonant circuits formed at least in each of the primary side circuit and the secondary side circuit, andwherein, with the multi-resonant circuit,the primary side resonant circuit and the secondary side resonant circuit resonate with each other, and electric power is transmitted from the primary side circuit to the secondary side circuit through an electromagnetic field resonant coupling in which currents flow in the mutual inductance and the mutual capacitance;
energy that is not transmitted from the primary winding is retained in the primary side resonant circuit as resonant energy through a resonance phenomenon;
of energy which the secondary winding has received, energy that is not supplied to an output is retained in the secondary side resonant circuit as resonant energy through a resonance phenomenon; and
the secondary side resonant circuit forms a current path that is different from a current path in which the rectifying element is formed in series to transmit electric power from the primary winding to the secondary winding.
1 Assignment
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Accused Products
Abstract
A primary side resonant circuit is formed by a primary side resonant inductor and a primary side resonant capacitor, and secondary side resonant circuits are formed by secondary side resonant inductors and secondary side resonant capacitors. Equivalent mutual inductances and equivalent mutual capacitances are formed through electromagnetic field resonant coupling between a primary winding and secondary windings, and a multi-resonant circuit including an LC resonant circuit formed in each of the primary side and the secondary side is formed. Electric power is transmitted from the primary side circuit to the secondary side circuit, and resonant energy that is not transmitted from the primary winding and, of energy which the secondary winding has received, resonant energy that is not supplied to an output are each retained in the multi-resonant circuit.
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Citations
18 Claims
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1. A switching power supply device, comprising:
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a transformer including at least a primary winding and a secondary winding; a primary side circuit including a primary side resonant inductor formed so as to be equivalent to and in series with the primary winding, a primary side resonant capacitor forming, together with the primary side resonant inductor, a primary side resonant circuit, and a primary side alternating current voltage generation circuit including at least two switching elements and configured to generate a trapezoidal wave alternating current voltage from an input direct current power supply voltage and to provide the trapezoidal wave alternating current voltage to the primary side resonant circuit; and a secondary side circuit including a secondary side resonant inductor formed so as to be equivalent to and in series with the secondary winding, a secondary side resonant capacitor forming, together with the secondary side resonant inductor, a secondary side resonant circuit, and a secondary side rectifying circuit including a rectifying element and configured to rectify an alternating current outputted from the secondary side resonant circuit to obtain a direct current voltage, wherein a mutual inductance is formed equivalently through mutual induction between the primary winding and the secondary winding;
a mutual capacitance is formed equivalently through interaction between the primary winding and the secondary winding; and
a multi-resonant circuit is formed that includes a plurality of LC resonant circuits formed at least in each of the primary side circuit and the secondary side circuit, andwherein, with the multi-resonant circuit, the primary side resonant circuit and the secondary side resonant circuit resonate with each other, and electric power is transmitted from the primary side circuit to the secondary side circuit through an electromagnetic field resonant coupling in which currents flow in the mutual inductance and the mutual capacitance; energy that is not transmitted from the primary winding is retained in the primary side resonant circuit as resonant energy through a resonance phenomenon; of energy which the secondary winding has received, energy that is not supplied to an output is retained in the secondary side resonant circuit as resonant energy through a resonance phenomenon; and the secondary side resonant circuit forms a current path that is different from a current path in which the rectifying element is formed in series to transmit electric power from the primary winding to the secondary winding. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification