Non-contact power transmission system
First Claim
Patent Images
1. A non-contact power transmission system for transmitting power without contact from a primary coil that is provided for a charging station to a secondary coil that is provided for an electric vehicle, the system comprising:
- a primary side control unit configured to transmit to the primary coil a weak power for alignment of the primary coil and the secondary coil;
a voltage detector configured to detect voltage generated by the weak power that is received by the secondary coil;
a tendency determination unit configured to determine whether a value of the voltage that changes as the electric vehicle travels tends to increase or decrease; and
a notification device configured to perform a first notification in response to determining that the value of the voltage is larger than a predetermined value and tends to increase, and a second notification in response to determining that the value of the voltage is larger than the predetermined value and tends to decrease,wherein the predetermined value is one of a plurality of local maximum values in characteristics representing a relation between the voltage detected by the voltage detector and a horizontal distance between the primary coil and the secondary coil, and the one of the plurality of local maximum values is not greatest among the plurality of local maximum values.
1 Assignment
0 Petitions
Accused Products
Abstract
A voltage detector detects an LPE voltage generated by a weak power that is received by a secondary coil. A tendency determination unit determines whether the voltage value that changes as an electric vehicle travels tends to increase or decrease. A display device and an acoustic device perform a first notification if the voltage value tends to increase, and a second notification if the voltage value tends to decrease.
-
Citations
7 Claims
-
1. A non-contact power transmission system for transmitting power without contact from a primary coil that is provided for a charging station to a secondary coil that is provided for an electric vehicle, the system comprising:
-
a primary side control unit configured to transmit to the primary coil a weak power for alignment of the primary coil and the secondary coil; a voltage detector configured to detect voltage generated by the weak power that is received by the secondary coil; a tendency determination unit configured to determine whether a value of the voltage that changes as the electric vehicle travels tends to increase or decrease; and a notification device configured to perform a first notification in response to determining that the value of the voltage is larger than a predetermined value and tends to increase, and a second notification in response to determining that the value of the voltage is larger than the predetermined value and tends to decrease, wherein the predetermined value is one of a plurality of local maximum values in characteristics representing a relation between the voltage detected by the voltage detector and a horizontal distance between the primary coil and the secondary coil, and the one of the plurality of local maximum values is not greatest among the plurality of local maximum values. - View Dependent Claims (2, 3, 4, 6, 7)
-
-
5. A non-contact power transmission system for transmitting a charging power without contact from a primary coil that is provided for a charging station to a secondary coil that is provided for an electric vehicle, the system comprising:
-
a primary side control unit configured to transmit to the primary coil a weak power for alignment of the primary coil and the secondary coil; a voltage detector configured to detect voltage generated by the weak power that is received by the secondary coil; a distance sensor configured to detect a travel distance of the electric vehicle; a secondary side control unit configured to calculate, based on a value of the voltage detected by the voltage detector and the travel distance of the electric vehicle detected by the distance sensor, a positional derivative that represents an amount of change of the value of the voltage with respect to an infinitesimal travel distance; and a notification device configured to, in response to determining that the value of the voltage is larger than a predetermined value, perform different notifications before and after the positional derivative becomes zero, wherein the predetermined value is one of a plurality of local maximum values in characteristics representing a relation between the voltage detected by the voltage detector and a horizontal distance between the primary coil and the secondary coil, and the one of the plurality of local maximum values is not greatest among the plurality of local maximum values.
-
Specification