Circuitry And Method For Inductive Power Transmission
First Claim
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1. Circuitry for inductive power transmission including a power transmitter and a power receiver,wherein the power transmitter comprises:
- an input with a first and a second input port;
a bridge circuit with at least a first and a second electronic switch, which are serially coupled between the first and the second input port, wherein a first bridge center is formed between the first and the second electronic switch;
a control device for controlling the first and the second electronic switch with a control signal of a presettable switching frequency, respectively; and
a power transmitter-side resonant circuit including at least one power transmitter-side capacitor and at least one further power transmitter-side impedance connected in series to each other, wherein the power transmitter-side resonant circuit is coupled between the first bridge center and one of the two input ports, wherein the power transmitter-side resonant circuit is passed by a resonant current, wherein a resonant voltage drops across the power-transmitter-side resonant circuit;
wherein the power receiver comprises;
a power receiver-side resonant circuit including at least a power receiver-side capacitor and a power receiver-side coil, wherein the power receiver-side coil is inductively coupled to the power transmitter-side impedance;
an output with a first and a second output port for providing an output voltage to a load;
wherein the power transmitter further includes a phase difference detecting device configured to detect a phase difference between the resonant current and the resonant voltage, the phase difference detecting device being coupled to the control device, wherein the control device is configured to modify the switching frequency of the control signals depending on the detected phase difference.
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Abstract
In this present invention, a primary and secondary series compensated inductive power transmission system with primary-side zero phase angle control and a loss-free clamp (LFC) circuit on the secondary-side is described. The effects of non-synchronous tuning are analyzed and intended detuning is proposed to guarantee controllability. The functional principle of the LFC circuit, which is required for output voltage stabilization over a wide load range and varying magnetic coupling, is explained. Finally, theoretical results are verified experimentally.
24 Citations
8 Claims
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1. Circuitry for inductive power transmission including a power transmitter and a power receiver,
wherein the power transmitter comprises: -
an input with a first and a second input port; a bridge circuit with at least a first and a second electronic switch, which are serially coupled between the first and the second input port, wherein a first bridge center is formed between the first and the second electronic switch; a control device for controlling the first and the second electronic switch with a control signal of a presettable switching frequency, respectively; and a power transmitter-side resonant circuit including at least one power transmitter-side capacitor and at least one further power transmitter-side impedance connected in series to each other, wherein the power transmitter-side resonant circuit is coupled between the first bridge center and one of the two input ports, wherein the power transmitter-side resonant circuit is passed by a resonant current, wherein a resonant voltage drops across the power-transmitter-side resonant circuit; wherein the power receiver comprises; a power receiver-side resonant circuit including at least a power receiver-side capacitor and a power receiver-side coil, wherein the power receiver-side coil is inductively coupled to the power transmitter-side impedance; an output with a first and a second output port for providing an output voltage to a load; wherein the power transmitter further includes a phase difference detecting device configured to detect a phase difference between the resonant current and the resonant voltage, the phase difference detecting device being coupled to the control device, wherein the control device is configured to modify the switching frequency of the control signals depending on the detected phase difference. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for inductive power transmission by circuitry including a power transmitter and a power receiver,
wherein the power transmitter comprises: - an input with a first and a second input port;
a bridge circuit with at least a first and a second electronic switch, which are serially coupled between the first and the second input port, wherein a first bridge center is formed between the first and the second electronic switch;
a control device for controlling the first and the second electronic switch with a control signal of a presettable switching frequency, respectively; and
a power transmitter-side resonant circuit including at least one power transmitter-side capacitor and at least one further power transmitter-side impedance connected in series to each other, wherein the power transmitter-side resonant circuit is coupled between the first bridge center and one of the two input ports, wherein the power transmitter-side resonant circuit is passed by a resonant current, wherein a resonant voltage drops across the power-transmitter-side resonant circuit;wherein the power receiver comprises a power receiver-side resonant circuit including at least a power receiver-side capacitor and a power receiver-side coil, wherein the power receiver-side coil is inductively coupled to the power transmitter-side impedance;
an output with a first and a second output port for providing an output voltage to a load;wherein the method includes the following steps; a) detecting a phase difference between the resonant current and the resonant voltage; and b) modifying the switching frequency of the control signals depending on the detected phase difference.
- an input with a first and a second input port;
Specification