POWER TRANSMISSION DEVICE, POWER TRANSMISSION AND RECEIVING DEVICE, METHOD FOR DETECTING POWER RECEIVING DEVICE, POWER RECEIVING DEVICE DETECTION PROGRAM, AND SEMICONDUCTOR DEVICE
First Claim
1. A power transmission device which transmits an electric power to a power receiving device in a noncontact state by using a resonance circuit, comprising:
- a control unit that sets a drive frequency of a signal for driving the resonance circuit;
a drive unit that drives the resonance circuit at three or more drive frequencies on the basis of a setting of the control unit; and
a drive waveform detecting unit that detects a drive waveform of the resonance circuit, whereinthe control unit sets the three or more drive frequencies, compares signal data at the drive frequencies detected by the drive waveform detecting unit with each other, and detects the power receiving device on the basis of the comparison result.
1 Assignment
0 Petitions
Accused Products
Abstract
To provide a power transmission device that can accurately discriminate a device or apparatus placed on a secondary side from a foreign object placed on the secondary side without adding a complex circuit. The power transmission device includes a control unit that sets a drive frequency of a signal for driving a resonance circuit, an inverter unit that drives the resonance circuit at three or more drive frequencies on the basis of a setting of the control unit, and a waveform monitor unit that detects a drive waveform of the resonance circuit. The control unit sets three or more drive frequencies according to a procedure of a program stored in a storage unit, compares signal data at the drive frequencies detected by a drive waveform detecting unit with each other, and detects a power receiving device on the basis of the comparison result.
-
Citations
34 Claims
-
1. A power transmission device which transmits an electric power to a power receiving device in a noncontact state by using a resonance circuit, comprising:
-
a control unit that sets a drive frequency of a signal for driving the resonance circuit; a drive unit that drives the resonance circuit at three or more drive frequencies on the basis of a setting of the control unit; and a drive waveform detecting unit that detects a drive waveform of the resonance circuit, wherein the control unit sets the three or more drive frequencies, compares signal data at the drive frequencies detected by the drive waveform detecting unit with each other, and detects the power receiving device on the basis of the comparison result. - View Dependent Claims (2, 3, 4, 5, 6, 9, 10, 11, 12, 27, 28, 29, 30)
-
-
7. (canceled)
-
8. (canceled)
-
13. A method for detecting power receiving device that detects, when an electric power is transmitted from a power transmission device to a power receiving device in a noncontact state by using a resonance circuit, the presence/absence of the power receiving device,
a control unit sets a drive frequency of a signal for driving the resonance circuit, a drive unit, on the basis of a setting of the control unit, drives the resonance circuit at three or more drive frequencies, a drive waveform detecting unit detects a drive waveform of the resonance circuit, and the control unit sets three or more drive frequencies, compares signal data at the drive frequencies detected by the drive waveform detecting unit with each other, and detects the power receiving device on the basis of the comparison result.
-
19. A power receiving device detection program for noncontact charging including a storage unit in which a program is stored and a control unit having a processing unit that develops and executes the stored program, when an electric power is transmitted from a power transmission device to a power receiving device in a noncontact state by using a resonance circuit, the power receiving device detecting program detecting the presence/absence of the power receiving device comprising:
-
the step of setting a drive frequency of a signal for driving a resonance circuit by the control unit; the step of driving the resonance circuit at three or more drive frequencies on the basis of a setting of the control unit by a drive unit; the step of detecting a drive waveform of the resonance circuit by a drive waveform detecting unit, wherein the control unit sets three or more drive frequencies, compares signal data at the drive frequencies detected by the drive waveform detecting unit with each other, and detects the power receiving device on the basis of the comparison result. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 33, 34)
-
Specification