Noncontact power supply facility and branch box for used therein

• US 20040119340A1
• Filed: 04/07/2003
• Published: 06/24/2004
• Est. Priority Date: 11/06/2000
• Status: Active Grant

• Current Assignee: Daifuku Company Limited
• Original Assignee: Daifuku Company Limited
• Inventors: Nishino, Shuzo
• Granted Patent: US 7,109,602 B2
• Time in Patent Office: Days
• US Class Current: 307/31
• CPC Class Codes: B60L 5/005 without mechanical contact between the collector and the power supply line
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/40 using two or more transmitting or receiving devices H02J50/50 takes precedence

Abstract

An arrangement comprising a magnetic body (12) having a hole portion (11) for passage of a primary-side first induction line (2), a primary-side second induction line (5) for electrically feeding a load in a contactless manner, an added line (17) passing through the hole portion (11) of the magnetic body, and 1a-th contact (19) for short-circuiting the added line 17. According to this arrangement, short-circuiting provided by the 1a-th contact (19) can cut off electric feeding to the primary-side second induction line (5), thereby isolating the load (second-side power receiving circuit) without mechanically switching the power supply line.

Claims

1. A contactless power supply system for feeding electric power from a primary-side induction line providing high frequency current to a secondary-side load in a contactless manner, characterized in that

the primary-side induction line comprises:

a first induction line connected to a power supply device;

at least one second induction line; and

a magnetic body for inductively coupling the first induction line and the second induction line,

the contactless power supply system including;

an added line wound on the magnetic body; and

a switch means for short-circuiting the added line.

2. A contactless power supply system as set forth in claim 1, characterized by further including a start circuit connected together with the switch means in parallel to the added line and adapted to raise current flowing in the second induction line with a predetermined time constant when the switch means is turned off.

3. A contactless power supply system for feeding electric power from a primary-side induction line providing high frequency current to a secondary-side load in a contactless manner, characterized in that

the primary-side induction line comprises:

a first induction line connected to a power supply device;

at least one second induction line; and

a magnetic body for inductively coupling the first induction line and the second induction line,

the contactless power supply system including;

an added line wound on the magnetic body;

a first switch means for short-circuiting the added line;

a second switch means for short-circuiting the second induction line; and

a start circuit connected together with the first switch means in parallel to the added line and adapted to raise current flowing in the second induction line with a predetermined time constant when the first and second switch means are turned off.

4. A contactless power supply system for feeding electric power from a primary-side induction line providing high frequency current to a secondary-side load in a contactless manner, characterized in that

the primary-side induction line comprises:

a first induction line connected to a power supply device;

at least one second induction line; and

a magnetic body for inductively coupling the first induction line and the second induction line,

the contactless power supply system including

an added line wound on the magnetic body;

a resistor connected to the added line;

a switch means for short-circuiting the second induction line; and

a start circuit connected together with the resistor in parallel to the added line and adapted to raise current flowing in the second induction line with a predetermined time constant when the switch means is turned off.

5. A contactless power supply system for feeding electric power from a primary-side induction line providing high frequency current to a secondary-side load in a contactless manner, characterized in that

the primary-side induction line comprises:

a first induction line connected to a power supply device;

at least one second induction line; and

a magnetic body for inductively coupling the first induction line and the second induction line,

the contactless power supply system including;

an added line wound on the magnetic body;

a plurality of series circuits connected in parallel to the added line, each circuit comprising a first switch means and a resistor; and

a second switch means for short-circuiting the second induction line,

wherein when the second switch means is turned off, the first switch means in the series circuits are turned off successively at time intervals.

6. A branch box in which a primary-side induction line providing high frequency current comprises a first induction line connected to a power supply device and at least one second induction line for electrically feeding a secondary-side load in a contactless manner, the branch box being used when the second induction line branches off from the first induction line, characterized in that

the branch box includes:

a pair of first terminals to which the first induction line is connected;

a pair of second terminals to which the second induction line is connected;

a magnetic body;

a first line wound on the magnetic body and connected to both ends of the first terminals;

a second line wound on the magnetic body and connected to both ends of the second terminals;

an added line wound on the magnetic body; and

a switch means for short-circuiting the added line.

7. A branch box as set forth in claim 6, characterized in that the switch means comprises a first switch means, that the branch box includes a second switch means for short-circuiting the second line, a pair of third terminals, and an electromagnetic contactor in which an exciting coil is connected to the third terminals, and that the first and second switch means are composed of contacts of the electromagnetic contactor.

8. A branch box as set forth in claim 7, characterized in that the third terminals are connected to the power supply device for feeding electric power to the first induction line, and the electromagnetic contactor is excited by the power supply device through the third terminals.