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(11) | EP 2 555 375 A8 |
(12) | CORRECTED EUROPEAN PATENT APPLICATION |
published in accordance with Art. 153(4) EPC |
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(54) | VOLTAGE DETECTOR, ABNORMALITY DETECTION DEVICE, NON-CONTACT POWER TRANSFER DEVICE, NON-CONTACT POWER RECEIVER DEVICE, AND VEHICLE |
(57) A voltage detector for detecting a voltage generated in a second resonant coil (110;
240) that is disposed to face a first resonant coil (240; 110) and that performs at
least one of electric power transmission and electric power reception to and from
the first resonant coil (240; 110) in a contactless manner by means of electromagnetic
resonance includes: a first high-impedance element (510) having one end connected
to one end of the second resonant coil (110; 240); a second high-impedance element
(520) having one end connected to the other end of the second resonant coil (110;
240); a low-impedance element (550) connected between the other end of the first high-impedance
element (510) and the other end of the second high-impedance element (520) and having
an impedance smaller than each of those of the first and second high-impedance elements
(510, 520); and an output terminal (560) for outputting a signal associated with a
voltage applied across the low-impedance element (550). In this way, in the contactless
power supply system employing the resonance method, the malfunction in the resonant
coil is detected while suppressing an influence over the resonance state between the
resonant coils and suppressing increase of cost.
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