Power transmission device and waveform monitor circuit for use in power transmission device
First Claim
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1. A power transmission device comprising:
- a primary coil;
a waveform monitor circuit configured to detect an electric potential at one end of the primary coil, and output a waveform monitor signal formed by restricting the detected electric potential to an electric potential which is equal to or higher than a reference electric potential;
a waveform detection circuit configured to detect a waveform change in the waveform monitor signal input from the waveform monitor circuit; and
a data detection circuit configured to detect data transmitted from a power reception device to the power transmission device based on a result of detection of the waveform change detected by the waveform detection circuit, wherein;
the waveform monitor circuit includes;
a rectification circuit including a diode, the diode being provided in series between the one end of the primary coil and an input end of the waveform detection circuit such that a direction from the one end of the primary coil to the input end of the waveform detection circuit is a forward direction of the diode; and
a first resistor, one end of which is connected to a node on a signal line between a cathode side of the diode and the input end of the waveform detection circuit, and another end of which is connected to a ground terminal held at a ground electric potential.
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Abstract
A power transmission device in a power transmission system including the power transmission device including a primary coil and a power reception device including a secondary coil, the primary coil being electromagnetically coupled to the secondary coil, to receive in the power reception device AC power transmitted from the power transmission device, comprises a waveform monitor circuit configured to detect an electric potential at one end of the primary coil and output a waveform monitor signal formed by restricting the detected electric potential to an electric potential which is equal to or higher than a ground electric potential; a waveform detection circuit configured to detect a waveform change in the waveform monitor signal input from the waveform monitor circuit; and a data detection circuit configured to detect data transmitted by load change by a load modulation unit in the power reception device based on a result of detection of the waveform change detected by the waveform detection circuit.
11 Citations
12 Claims
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1. A power transmission device comprising:
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a primary coil; a waveform monitor circuit configured to detect an electric potential at one end of the primary coil, and output a waveform monitor signal formed by restricting the detected electric potential to an electric potential which is equal to or higher than a reference electric potential; a waveform detection circuit configured to detect a waveform change in the waveform monitor signal input from the waveform monitor circuit; and a data detection circuit configured to detect data transmitted from a power reception device to the power transmission device based on a result of detection of the waveform change detected by the waveform detection circuit, wherein; the waveform monitor circuit includes; a rectification circuit including a diode, the diode being provided in series between the one end of the primary coil and an input end of the waveform detection circuit such that a direction from the one end of the primary coil to the input end of the waveform detection circuit is a forward direction of the diode; and a first resistor, one end of which is connected to a node on a signal line between a cathode side of the diode and the input end of the waveform detection circuit, and another end of which is connected to a ground terminal held at a ground electric potential. - View Dependent Claims (2, 3, 7, 8)
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4. A power transmission device comprising:
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a primary coil; a waveform monitor circuit configured to detect an electric potential at one end of the primary coil, and output a waveform monitor signal formed by restricting the detected electric potential to an electric potential which is equal to or higher than a reference electric potential; a waveform detection circuit configured to detect a waveform change in the waveform monitor signal input from the waveform monitor circuit; and a data detection circuit configured to detect data transmitted from a power reception device to the power transmission device based on a result of detection of the waveform change detected by the waveform detection circuit, wherein; the waveform monitor circuit includes; a rectification circuit including a diode and a second resistor, the diode being provided in series between the one end of the primary coil and an input end of the waveform detection circuit such that a direction from the one end of the primary coil toward the input end is a forward direction of the diode, and the second resistor being provided at an anode side of the diode; a first resistor, one end of which is connected to a node on a signal line between the anode side of the diode and the second resistor, and another end of which is connected to a ground terminal held at a ground electric potential; and a third resistor, one end of which is connected to a cathode side of the diode and another end of which is connected to the ground terminal. - View Dependent Claims (5, 6, 11, 12)
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9. A waveform monitor circuit comprising:
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an input terminal to be connected to one end of a primary coil of a power transmission device; an output terminal to be connected to an waveform detection circuit of the power transmission device; a rectification circuit including a diode, the diode being provided in series between the input terminal and the output terminal such that a direction from the input terminal to the output terminal is a forward direction of the diode; and a first resistor, one end of which is connected to a node on a signal line between an output end of the rectification circuit and the output terminal, and the other end of which is connected to a ground terminal held at a ground electric potential.
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10. A waveform monitor circuit comprising:
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an input terminal to be connected to one end of a primary coil of a power transmission device; an output terminal to be connected to an waveform detection circuit of the power transmission device; a rectification circuit including a diode and a second resistor, the diode being provided in series between the input terminal and the output terminal such that a direction from the input terminal to the output terminal is a forward direction of the diode, and the second resistor being provided at an anode side of the diode; a first resistor, one end of which is connected to a signal line between an anode side of the diode and the second resistor, and the other end of which is connected to a ground terminal held at a ground electric potential; and a third resistor, one end of which is connected to a cathode side of the diode and the other end of which is connected to the ground terminal.
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Specification
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Current AssigneeKoninklijke Philips N.V.
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Original AssigneePanasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
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InventorsKihara, Hideyuki, Ohta, Kazuyo, Kada, Kyohei, Suzuki, Kazuhiro, Matsumoto, Takaoki
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Primary Examiner(s)Kaplan, Hal
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Assistant Examiner(s)Yeshaw, Esayas
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Application NumberUS13/628,845Publication NumberTime in Patent Office1,286 DaysField of Search307/104US Class Current1/1CPC Class CodesH02J 50/10 using inductive couplingH02J 50/80 involving the exchange of d...H04B 5/266 One coil at each side, e.g....H04B 5/79 for data transfer in combin...
