US-12627172-B2 - Wireless power supply apparatus

US12627172B2US 12627172 B2US12627172 B2US 12627172B2US-12627172-B2

Abstract

A wireless power supply apparatus that supplies power to a reception apparatus in a wireless manner, the wireless power supply apparatus including: a power source apparatus that outputs an AC power, a transmission coil electrically connected to the power source apparatus; and a setting circuit interposed between the power source apparatus and the transmission coil, setting the transmission coil to be in either a power feeding state or a standby state, wherein the setting circuit is provided separately from the power source apparatus.

Inventors

Masaya Takahashi
Mitsuru Shibanuma
Yusei NAKAYASHIKI
Eisuke Takahashi
Kazuyoshi Obayashi
Nobuhisa Yamaguchi

Assignees

DENSO CORPORATION

Dates

Publication Date: 20260512
Application Date: 20241030
Priority Date: 20220518

Claims (7)

1 . A wireless power supply apparatus that supplies power to a reception apparatus in a wireless manner, the wireless power supply apparatus comprising: a power source apparatus that outputs an AC power; a transmission coil module including a transmission coil electrically connected to the power source apparatus; and a setting circuit interposed between the power source apparatus and the transmission coil, the setting circuit configured to set the transmission coil to be in either a power feeding state or a standby state, wherein the setting circuit is provided separately from the power source apparatus; the transmission coil module further comprises: an external connection terminal for electrically connecting with the power source apparatus, a wiring that electrically connects between the external connection terminal and the transmission coil, and the setting circuit connected to the wiring; the setting circuit is configured to be capable of switching a state between a first state and a second state, and configured to set the power feeding state in the first state and set the standby state in the second state; the wireless power supply apparatus further comprises a detection circuit and a switch circuit; the detection circuit detects a physical quantity which varies depending on a distance between the transmission coil and a reception coil of the reception apparatus, and outputs a detection signal to the switch circuit; the switch circuit outputs, using the detection signal, a switch signal to the setting circuit to switch the state between the first state and the second state; and the detection circuit and the switch circuit are arranged in the transmission coil module.
2 . The wireless power supply apparatus according to claim 1 , wherein the setting circuit is disposed inside the transmission coil.
3 . The wireless power supply apparatus according to claim 2 , wherein the transmission coil and the setting circuit are arranged on a same substrate.
4 . The wireless power supply apparatus according to claim 1 , wherein the transmission coil is disposed on a passage where a vehicle travels; and the setting circuit is disposed at a portion different from the passage.
5 . The wireless power supply apparatus according to claim 1 , wherein the setting circuit is configured of any one of a first circuit, a second circuit and a third circuit; the first circuit includes a variable capacitance capacitor and is configured such that a capacitance of the variable capacitance capacitor is set to be a first capacitance, thereby setting the power feeding state, and a capacitance of the variable capacitance capacitor is set to be a second capacitance, thereby setting the standby state; the second circuit includes a second circuit switch that switches between a conduction state where the AC power is supplied to the transmission coil and a non-conduction state where the AC power is not supplied to the transmission coil, the second switch is caused to be in the conduction state, thereby setting the power-feeding state and the second switch is caused to be in the non-conduction state, thereby setting the standby state; the third circuit includes a plurality of capacitors having mutually different capacitances and a third circuit switch that switches some of the plurality of capacitors to be in either a conduction state or a non-conduction state, the third circuit switch is caused to be in either one of the conduction state or the non-conduction state, thereby setting the power feeding state, and the third circuit switch is caused to be in the other state, thereby setting the standby state.
6 . The wireless power supply apparatus according to claim 1 , wherein a plurality of the transmission coils are provided; and the plurality of transmission coils are connected in parallel to the power source apparatus.
7 . The wireless power supply apparatus according to claim 1 , further comprising a conversion circuit that converts the AC power to a DC power and supplies the DC power to either one of the detection circuit or the switch circuit, wherein the conversion circuit is disposed in the transmission coil module.

Description

CROSS-REFERENCE OF RELATED APPLICATIONS This application is the U.S. bypass application of International Application No. PCT/JP2023/017362 filed on May 9, 2023, which designated the U.S. and claims priority to Japanese Patent Application 2022-81643 filed on May 18, 2022, and the contents of both of these are incorporated herein by reference. BACKGROUND Technical Field The present disclosure relates to wireless power supply apparatus. Description of the Related Art A power supply system is known in which a transmission coil supplied with power from a high frequency power source is provided and a reception coil mounted on a mobile body for example is supplied with a power in a wireless manner. According to the power supply system disclosed in the above-mentioned power supply system, a current control element is disposed, in order to suppress a current flowing through the transmission coil in a standby-state, in which the impedance increases when a current flowing between the high frequency power source and the transmission coil is less than a threshold value. SUMMARY The present disclosure can be embodied in the following manners. According to one aspect of the present disclosure, a wireless power supply apparatus that supplies power to a reception apparatus in a wireless manner is provided. The wireless power supply apparatus is provided with a power source apparatus that outputs an AC power; a transmission coil electrically connected to the power source apparatus; and a setting circuit interposed between the power source apparatus and the transmission coil, setting the transmission coil to be in either a power feeding state or a standby state, wherein the setting circuit is provided separately from the power source apparatus. BRIEF DESCRIPTION OF THE DRAWINGS The above-described objects and other objects, features and advantages of the present disclosure will be clarified further by the following detailed description with reference to the accompanying drawings. The drawings are: FIG. 1 is a diagram showing an overall configuration of a wireless power supply system; FIG. 2 is a diagram showing a circuit configuration of the wireless power supply system; FIG. 3 is a diagram showing an opposed state and a non-opposed state between a transmission coil and a reception coil; FIG. 4 is a diagram showing a circuit configuration of a wireless power supply apparatus according to a second embodiment; FIG. 5 is diagram showing a plan view of a substrate on which a transmission coil and a capacitor according to the second embodiment are arranged; FIG. 6 is a diagram showing an arrangement of a circuit configuration of a wireless power supply apparatus according to a third embodiment; FIG. 7 is a diagram showing a circuit configuration of a wireless power supply apparatus according to a fourth embodiment; FIG. 8 is a diagram showing a circuit configuration of a wireless power supply apparatus according to a fifth embodiment; FIG. 9 is a diagram showing a circuit configuration of a wireless power supply apparatus according to a sixth embodiment; FIG. 10 is a diagram showing an arrangement of a circuit configuration of a wireless power supply apparatus according to a seventh embodiment; FIG. 11 is a circuit configuration of a transmission circuit according to a first form of another embodiment; and FIG. 12 is a circuit configuration of a transmission circuit according to a second form of another embodiment. DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS A power supply system is known. For example, JP-A-2019-71719 discloses a power supply system in which a transmission coil supplied with power from a high frequency power source is provided and a reception coil mounted on a mobile body for example is supplied with a power in a wireless manner. According to the power supply system disclosed in the above-mentioned patent literature, a current control element is disposed, in order to suppress a current flowing through the transmission coil in a standby-state, in which the impedance increases when a current flowing between the high frequency power source and the transmission coil is less than a threshold value. However, an arrangement of a circuit to suppress the current flowing through the transmission coil in a standby-state is not sufficiently considered. Hence, it needs to improve the arrangement of the circuit. A. First Embodiment As shown in FIG. 1, a wireless power supply system 1 is provided with a wireless power supply apparatus 10, a power reception apparatus 92 mounted on a vehicle 90. The wireless power supply apparatus 10 supplies power to the power reception apparatus 92 in a wireless manner. The vehicle 90 may be, for example, an electric vehicle or a hybrid vehicle to which a drive motor is mounted. The wireless power supply apparatus 10 includes a transmission coil module 40 provided on a road RS as a passage where the vehicle 90 travels. As described later, the wireless power supply apparatus 10 is provided with