Non-contact power supply device
First Claim
1. A non-contact power supply device in which a primary unit and a secondary unit of a coupling transformer are separated for use and transfers electric power from the primary unit to the secondary unit through electromagnetic induction in a non-contact fashion, wherein:
- said secondary unit of the coupling transformer comprising;
a second rectifying smoothing circuit for rectifying and smoothing a high frequency alternating current flowing through a secondary winding based on a high frequency alternating current flowing through a primary winding of the primary unit in order to produce a DC (direct current) output voltage;
a voltage hold circuit for maintaining the DC output voltage from the second rectifying smoothing circuit for a predetermined time length;
a constant voltage output circuit for producing a constant voltage based on the DC output voltage from the voltage hold circuit;
a control circuit provided with the constant voltage from the constant voltage output circuit as a power source for controlling an operation of a load connected to said secondary unit; and
a drive signal generation circuit for supplying a drive signal to the control circuit when the output voltage from the second rectifying smoothing circuit becomes smaller than a predetermined voltage; and
said primary unit of the coupling transformer comprising;
an operation circuit for either stopping the high frequency alternating current flowing through the primary winding or changing the frequency of the high frequency alternating current flowing through the primary winding to decrease the DC output voltage of the second rectifying smoothing circuit smaller than said predetermined voltage for generating said drive signal by said drive signal generation circuit.
1 Assignment
0 Petitions
Accused Products
Abstract
A non-contact power supply device having a primary unit and a secondary unit of a coupling transformer for driving a load such as decoration lamps. The primary unit is installed inside of premises and the secondary unit is installed outside of the premises and the decoration lamps are connected to the secondary unit. The primary unit and the secondary unit are attached to an intervening body such as a window or a wall in a face-to-face fashion. The non-contact power supply device is able to control and change an output voltage of the secondary unit and lighting patters of the decoration lamps solely from the inside of the premises without need for a user to go outside.
70 Citations
25 Claims
-
1. A non-contact power supply device in which a primary unit and a secondary unit of a coupling transformer are separated for use and transfers electric power from the primary unit to the secondary unit through electromagnetic induction in a non-contact fashion, wherein:
-
said secondary unit of the coupling transformer comprising;
a second rectifying smoothing circuit for rectifying and smoothing a high frequency alternating current flowing through a secondary winding based on a high frequency alternating current flowing through a primary winding of the primary unit in order to produce a DC (direct current) output voltage;
a voltage hold circuit for maintaining the DC output voltage from the second rectifying smoothing circuit for a predetermined time length;
a constant voltage output circuit for producing a constant voltage based on the DC output voltage from the voltage hold circuit;
a control circuit provided with the constant voltage from the constant voltage output circuit as a power source for controlling an operation of a load connected to said secondary unit; and
a drive signal generation circuit for supplying a drive signal to the control circuit when the output voltage from the second rectifying smoothing circuit becomes smaller than a predetermined voltage; and
said primary unit of the coupling transformer comprising;
an operation circuit for either stopping the high frequency alternating current flowing through the primary winding or changing the frequency of the high frequency alternating current flowing through the primary winding to decrease the DC output voltage of the second rectifying smoothing circuit smaller than said predetermined voltage for generating said drive signal by said drive signal generation circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
a first rectifying smoothing circuit for producing a direct current by rectifying and smoothing an alternating current (AC) power supply, and a drive circuit which oscillates for converting the direct current from the first rectifying smoothing circuit to the high frequency alternating current so that the high frequency alternating current flows through the primary winding; and
wherein said operation circuit stops the oscillation or changes the oscillation frequency in the drive circuit so as to stop the oscillation or to change the oscillation frequency of the high frequency alternating current flowing through the primary winding, thereby changing the DC output voltage of the second rectifying smoothing circuit in the secondary unit of the coupling transformer smaller than said predetermined voltage.
-
-
4. A non-contact power supply device as defined in claim 1, wherein said secondary winding in the secondary unit of the coupling transformer includes a resonance circuit so that the oscillation frequency in the primary unit and a resonance frequency in the secondary unit become identical to one another.
-
5. A non-contact power supply device as defined in claim 4, wherein said primary unit includes a frequency compensation circuit for changing the oscillation frequency of the high frequency alternating current flowing through the primary unit to be different from the resonance frequency of the secondary unit when a distance between the primary unit and the secondary unit installed together is small.
-
6. A non-contact power supply device as defined in claim 5, wherein said primary unit of the coupling transformer is comprised of:
-
a first rectifying smoothing circuit for producing a direct current by rectifying and smoothing an alternating current (AC) power supply, and a drive circuit which oscillates for converting a direct current from the first rectifying smoothing circuit to the high frequency alternating current so that the high frequency alternating current flows through the primary winding; and
wherein said frequency compensation circuit changes the oscillation frequency of the high frequency alternating current produced by the drive circuit to be different from the resonance frequency of the secondary unit.
-
-
7. A non-contact power supply device as defined in claim 1, further comprising a switch for either connecting or disconnecting an alternating current (AC) power supply to the primary unit of the coupling transformer.
-
8. A non-contact power supply device as defined in claim 7, wherein said switch disconnects the alternating current (AC) power supply to the primary unit when the primary unit and the secondary unit of the coupling transformer are directly attached together without any intervening body.
-
9. A non-contact power supply device as defined in claim 7, wherein said switch disconnects the alternating current (AC) power supply to the primary unit when the primary unit and the secondary unit of the coupling transformer are not attached face-to-face to one another.
-
10. A non-contact power supply device as defined in claim 9, wherein said switch disconnects the alternating current (AC) power supply to the primary unit when the primary unit and the secondary unit of the coupling transformer are directly attached together without any intervening body.
-
11. A non-contact power supply device as defined in claim 1, wherein a side surface of each of a primary core of said primary unit and a secondary core of said secondary unit has a C-shape where end surfaces of the primary core and the secondary core are positioned face-to-face with one another.
-
12. A non-contact power supply device as defined in claim 1, said primary unit is provided with a casing made of high conductive non-magnetic metal which covers an overall primary core other than end surfaces thereof facing the secondary unit.
-
13. A non-contact power supply device as defined in claim 1, wherein said coupling transformer is comprised of:
-
a first coupling transformer whose primary winding is formed in the primary unit and whose secondary winding is formed in the secondary unit;
a second coupling transformer where one end of its primary winding is connected to one end of the secondary winding of the first coupling transformer and other end of its primary winding is connected to one end of a secondary winding; and
a resonance circuit formed in the primary where one end of the resonance circuit is connected to the primary winding and the secondary winding of the second coupling transformer and the other end of the resonance circuit is connected to the other end of the secondary winding of the first coupling transformer;
wherein the high frequency alternating current is produced between the other end of the secondary winding of the second coupling transformer and the other end of the secondary winding of the first coupling transformer.
-
-
14. A non-contact power supply device in which a primary unit and a secondary unit of a coupling transformer are separated for use and transfers electric power from the primary unit to the secondary unit through electromagnetic induction in a non-contact fashion, comprising:
-
a first coupling transformer whose primary winding is formed in the primary unit and whose secondary winding is formed in the secondary unit;
a second coupling transformer where one end of its primary winding is connected to one end of the secondary winding of the first coupling transformer and other end of its primary winding is connected to one end of a secondary winding; and
a resonance circuit formed in the secondary unit where one end of the resonance circuit is connected to both the primary winding and the secondary winding of the second coupling transformer and the other end of the resonance circuit is connected to the other end of the secondary winding of the first coupling transformer;
wherein the high frequency alternating current is produced between the other end of the secondary winding of the second coupling transformer and the other end of the secondary winding of the first coupling transformer. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
an inverter circuit having two sets of parallel connected switching circuits where each switching circuit has two serially connected switching elements, said inverter circuit receiving the DC output voltage from said rectifying smoothing circuit;
an oscillation circuit which oscillates at a predetermined frequency; and
an inverter drive circuit for turning the switching elements in the inverter circuit on and off in response to an output signal of the oscillation circuit thereby producing an alternating voltage with a frequency corresponding to the predetermined frequency at an output of the inverter circuit.
-
-
18. A non-contact power supply device as defined in claim 14, wherein said primary unit of said coupling transformer comprising:
-
a first rectifying circuit for rectifying an AC voltage from a commercial AC power supply; and
a drive circuit for chopper controlling an output voltage from that first rectifying circuit and flowing an alternating current of high frequency to the primary winding of the first coupling transformer;
and said secondary unit of said coupling transformer comprising;
a second rectifying circuit for rectifying an alternating voltage output between one end of the secondary winding of the first coupling transformer and one end of the secondary winding of the second coupling transformer;
a low pass filter circuit for removing high frequency components from an output voltage of the second rectifying circuit;
a zero-crossing detection circuit for generating a zero-crossing detection signal every time when the output voltage from the low pass filter circuit becomes approximately zero volt;
an inverter circuit having two sets of parallel connected switching circuits where each switching circuit has two serially connected switching elements and receiving the output voltage from the low pass filter circuit; and
an inverter drive circuit for turning the switching elements in the inverter circuit on and off in response to the zero-crossing detection signal from said zero-crossing detection circuit thereby producing an alternating voltage with a frequency equal to the commercial AC power supply at an output of the inverter circuit.
-
-
19. A non-contact power supply device as defined in claim 18, further comprising a double pulse prevention circuit between said zero-crossing detection circuit and said inverter drive circuit for producing one zero-crossing detection signal and preventing two or more zero-crossing detection signals from being transmitted to said inverter drive circuit within a predetermined time length.
-
20. A non-contact power supply device as defined in claim 14, further comprising a switch for either connecting or disconnecting an alternating current (AC) power supply to the primary unit of the coupling transformer.
-
21. A non-contact power supply device as defined in claim 20, wherein said switch disconnects the alternating current (AC) power supply to the primary unit when the primary unit and the secondary unit of the coupling transformer are directly attached together without any intervening body.
-
22. A non-contact power supply device as defined in claim 20, wherein said switch disconnects the alternating current (AC) power supply to the primary unit when the primary unit and the secondary unit of the coupling transformer are not attached face-to-face to one another.
-
23. A non-contact power supply device as defined in claim 22, wherein said switch disconnects the alternating current (AC) power supply to the primary unit when the primary unit and the secondary unit of the coupling transformer are directly attached together without any intervening body.
-
24. A non-contact power supply device as defined in claim 14, wherein a side surface of each of a primary core of said primary unit and a secondary core of said secondary unit has a C-shape where end surfaces of the primary core and the secondary core are positioned face-to-face with one another.
-
25. A non-contact power supply device as defined in claim 14, said primary unit is provided with a casing made of high conductive non-magnetic metal, which covers a primary core other than end surfaces thereof facing the secondary unit.
Specification