NON-CONTACT POWER TRANSMISSION APPARATUS AND POWER TRANSMISSION DEVICE

• US 20160126747A1
• Filed: 10/15/2015
• Published: 05/05/2016
• Est. Priority Date: 10/31/2014
• Status: Abandoned Application

• Current Assignee: Toshiba Tec Corporation (Toshiba Corporation)
• Original Assignee: Toshiba Tec Corporation (Toshiba Corporation)
• Inventors: Kato, Masakazu, Kanagawa, Masahiro
• Application Number:
  US14/883,713
• Publication Number:
  US 20160126747A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/60 responsive to the presence of foreign objects, e.g. detection of living beings
• CPC Class Codes: H02J 7/00045 Authentication, i.e. circuits for checking compatibility between one component, e.g. a battery or a battery charger, and another component, e.g. a power source
• CPC Class Codes: H02J 7/00304 Overcurrent protection

Abstract

A non-contact power transmission apparatus comprises a power transmission device configured to include a power transmission circuit that is connected to a power transmission coil and supplies power and a current detection circuit that detects current supplied to the power transmission circuit; and a power receiving device configured to include a rectifier circuit which is connected to a power receiving coil, a voltage conversion circuit which is connected to the rectifier circuit and converts into voltage of driving a load circuit and a switching circuit which connects or disconnects the voltage generated by the voltage conversion circuit with the load circuit.

Claims

1. A non-contact power transmission apparatus, comprising:

a power transmission device which includes a power transmission coil, a power transmission circuit configured to be connected to the power transmission coil and supply power through the power transmission coil, a current detection circuit configured to detect current supplied to the power transmission circuit and a first control circuit configured to control the power transmission circuit; and

a power receiving device which includes a power receiving coil, a rectifier circuit configured to be connected to the power receiving coil, a voltage conversion circuit configured to be connected to the rectifier circuit and convert into voltage of driving a load circuit, a switching circuit configured to connect or disconnect the voltage generated by the voltage conversion circuit with the load circuit and a second control circuit configured to control the switching circuit, wherein

the second control circuit, after starting to receive power, carries out a control processing to connect the load circuit during a period of time T0, then disconnect the load circuit during a period of time T1 and repeat connection and disconnection; and

the first control circuit carries out a control processing to detect repeatedly current values at an interval of time T2 through the current detection circuit and stop power transmission if the current value is above a current threshold value during at least (T0+T1) time.

4. The non-contact power transmission apparatus according to claim 1, wherein

enable function of the voltage conversion circuit connects or disconnects the load circuit in the power receiving device as the switching circuit.

2. A non-contact power transmission apparatus, comprising:

a power receiving device configured to receive power in a non-contact manner and repeat connection and disconnection with load circuit to supply power to the load circuit; and

a power transmission device configured to detect power transmission current value when power is transmitted to the power transmission device and stop power transmission in a case in which the power transmission current value is greater than current threshold value during a period when the load circuit is detached.

3. A non-contact power transmission apparatus, comprising:

a power transmission device which includes a power transmission coil, a power transmission circuit configured to be connected to the power transmission coil and supply power through the power transmission coil, a current detection circuit configured to detect current supplied to the power transmission circuit and a first control circuit configured to control the power transmission circuit; and

a power receiving device which includes a power receiving coil, a rectifier circuit configured to be connected to the power receiving coil, a voltage conversion circuit configured to be connected to the rectifier circuit and convert into voltage of driving a load circuit, a switching circuit configured to connect or disconnect the voltage conversion circuit with the load circuit and a second control circuit configured to control the switching circuit, wherein

the second control circuit, after starting to receive power, carries out a control processing to connect the load circuit during a period of time T0, then disconnect the load circuit during a period of time T1 and repeat connection and disconnection; and

the first control circuit carries out a control processing to detect current value during a period of the T1 through the current detection circuit and stop power transmission if the current value is above a current threshold value.

5. The non-contact power transmission apparatus according to claim 3, wherein

enable function of the voltage conversion circuit connects or disconnects the load circuit in the power receiving device as the switching circuit.

6. A power transmission device, comprising:

a power transmission coil;

a power transmission circuit configured to supply current to the power transmission coil;

a current detection circuit configured to detect current supplied to the power transmission circuit; and

a control circuit configured to carry out a control processing to detect power transmission current value during power transmission through the current detection circuit at a specified time interval and stop power transmission if the power transmission current value is above a current threshold value of a specified time.