JPH09312902A - Non-contact power supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cancel electromagnetic force appearing in each section in an adjacent section and lessen the emission of electromagnetic noise by partitioning two feeders which are located parallel along a movement path of a moving body into unit sections of a small length and locating a going line and a coming line alternately in the unit sections along the movement path. SOLUTION: In a non-contact power supply device which supplies power to a moving body non-contact, two feeders which are located parallelly along a movement path of the moving body from a high-frequency power supply 11 are partitioned into unit sections of a specified length. And, the unit sections are so connected that going current may flow in the two feeders 12, 13 alternately by a route of going lines 21a, 21c, 21e, 21g,... and coming current may flow in the two feeders 12, 13 alternately by a route of coming lines... 22g, 22e, 22c, and 22a. By this method, the emission of electromagnetic noise appearing in the two feeders can be lessened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-contact type power feeding device for a moving body.

[0002]

2. Description of the Related Art Prior arts are disclosed in JP-A-5-207603, JP-A-5-207604, and JP-A-5-20.
As in Japanese Patent No. 7605 and Japanese Patent Laid-Open No. 5-207606, a pair of power supply lines that circulate the primary side current are provided, and a high frequency sine current is passed through the power supply lines to generate an AC magnetic field centered on the power supply lines. There is a system in which a pickup coil provided in a moving body induces a current from the alternating magnetic field to take in power to the moving body.

[0003]

Relatively large electric power is applied to the high frequency voltage and current applied over the entire length of the power supply line. Therefore, it is desired to develop a system in which a high level of electromagnetic noise is emitted from the power supply line and adversely affects electronic devices installed in the vicinity, without causing an abnormality.

More specifically, referring to FIG. 4, the power supply line 1 and the power supply line 3 of the power supply source 1 are a forward current 4 and a return current 5.
To generate an AC magnetic field 6 generated in the power supply line 2 or the power supply line 3, and a pickup coil 8 provided in the moving body 7 causes the AC magnetic field 6 in the vicinity of the pickup coil 8 to flow. Detected, pickup coil 8
It is an electromagnetic coupling system that induces electric power to the mobile body 7 and takes it into the moving body 7.

In this way, since the forward current and the backward current are separately supplied to the power supply lines 2 and 3, when viewed from the point 9 in FIG. 4, for example, the power is transferred to the power supply line 2 and the power supply line 3 at different distances from the point 9. The current 4 and the return current 5 flow in opposite directions. At this time, the electric field and magnetic field induced by the forward current 4 and the returning current 5 at the point 9 are proportional to the reciprocal of the square of the distance between the point 9 and the returning current 4 and the returning current 5, and therefore the forward current 4 , Even if the directions of the return currents 5 are opposite, they do not cancel each other and a difference occurs,
This portion appears as induced noise at the point 9.

An object of the present invention is to provide a power supply device which emits less electromagnetic noise.

[0007]

DISCLOSURE OF THE INVENTION The present invention is a feeder line arranged in two rows along a moving path, wherein the feeding lines in each row alternate forward and backward lines in the longitudinal direction of the moving path. It is characterized by arranging along.

Since the forward line and the backward line are alternately arranged,
The feeder line is divided into small length units, and the electromagnetic force generated in each section is canceled in the adjacent sections, so that noise can be reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIG. Substantially, there are two rows of feeder lines 12 and 13 along the moving direction of the moving body 7 as in the conventional case. High frequency power supply 11
If one electric wire connected to is a forward wire 21 and the other electric wire is a return wire 22, the power supply wires 12 of one row are 21a and 22a.
c, 21e, 22g ... The power supply line 13 in the other row is composed of 22a, 21c, 22e, 21g .... Forward line 21 and return line 2 of power supply lines 12 and 13 in each row
The two lines are connected by forward lines 21b, 21d, 21f, 21g ... And return lines 22b, 22d, 22f, 22g. It can be configured by bending and arranging the outgoing line 21 and the returning line 22 as shown. Forward lines 21a, 21c,
21e ..., The return lines 22a, 22c, 22e ... are predetermined lengths and are relatively short. That is, the power supply lines 12 and 13 are divided (that is, divided) into a predetermined length by the forward line 21 and the backward line 22. The forward line of one row is the forward line of the other row, and the return line of the one row is the return line of the other row. The intervals between the respective dividing positions are made small. The dividing position of one row and the dividing position of the other row are substantially the same position in the moving direction of the moving body.

According to this structure, the outgoing wire 36 is
For example, a → 21c → 21e → 21g ... Alternately flows in the rows 12 and 13 for each division. Similarly, return wire 37 ... 22
g → 22e → 22c → 22a ... Alternately flows through the columns 12 and 13 for each division.

According to this structure, when viewed at the point 38, the electric field and the magnetic field generated at the point 38 have a forward current and a backward current, which are adjacent to each other, which flow in the order.
It is possible to cancel out the noise components induced by the power supply line and prevent the influence on electronic devices around the power supply line. For example, the electromagnetic effect can be suppressed to 1/100 or less. Therefore, the alternating current applied to the power supply line can have a higher frequency, and a system with higher power supply efficiency can be obtained.

In the above embodiment, the dividing position of one row and the dividing position of the other row are substantially the same in the moving direction of the moving body, but they may be greatly different. .

When the power supply lines 12 and 13 are applied to the electromagnetic coupling system shown in FIG. 4, the power supply lines 12 and 13 are used.
Closing the end 39 of the.

When applied to the electrostatic coupling system described below, the terminal 39 is opened. In FIG. 2A, the moving body 7
In addition, collecting electrodes 45 and 46 are provided at a predetermined distance from the feeder lines 12 and 13. In this way, the impedances of the capacitances 48 and 49 are electrically coupled between 12 and 45 and between 13 and 46. An inductive load 47 that resonates with the capacitances of the capacitances 48 and 49 is connected between the fixed electrode 45 and the fixed electrode 46, and the series resonance of 47, 48, and 49 reduces the impedance to facilitate the flow of current, and A method of supplying electric power will be used. In this way, the fixed electrode 45
The electric power collected between the power supply circuit 46 and the power supply circuit 46 is supplied to the power supply circuit and the control circuit 50 built in the moving body 7.

That is, the current supplied from the high frequency power supply 11 becomes a current via the electrostatic capacity 48 and is taken into the moving body 7, and its return path becomes a current via the electrostatic capacity 49, and becomes a return current to the high frequency power supply 11. Become. The electric power taken into the control circuit 50 is used by the drive motor 5 for moving the moving body 7.
It is used as a power source for driving the mechanical unit 52 in the moving body 7 and an operating power source for the control circuit 50.

In FIG. 2A, electrostatic capacitances 48, 49
The impedance and C _1, the impedance of the inductive load 47 and L _1, the control circuit 50 from the high frequency circuit
If the impedance seen is Z ₁ , then the equivalent circuit is as shown in FIG. Where C ₁ -L ₁ -C ₁
By setting a resonance condition between them, a large resonance current IR ₁ flows through L ₁ and C ₁ , and a high voltage can be obtained across L ₁ . This value is taken into the impedance and the control circuit 5
Power is supplied to the inside at 0.

According to this, the collector electrode 45 of the moving body 7,
This is a method in which a current is concentratedly supplied to 46, and therefore, the feeding current and the moving body uptake current are approximately 1: 1. Comparing the uptake current into the moving body with a fixed amount, the feeding current from the power source is Can be realized with a small value of about 1/50.
As a result, the current capacity of each part is significantly reduced, and the system can be made compact and low loss. In addition, since the current rating of the component can be significantly reduced, the component can be downsized and the heat radiation process for heat generation can be omitted, resulting in an economical system.

In the structure shown in FIG. 3A, the inductive load 47 shown in FIG. 2 is connected between the collector electrodes 45 and 46, but the inductive impedance L ₁ corresponding to the inductive load 47 is connected in series. The equivalent circuit is as shown in FIG. 3B, and C ₂ −L ₂ −
By making C _{2 a} resonance condition similarly, those impedances are canceled out, and the output terminal voltage of the high frequency power supply 11 is
It is taken into impedance Z _{2 as} it is, and the control circuit 50
Power. In this method, the output voltage of the high frequency power supply 11 can be directly obtained as the impedance Z ₂ .

[0019]

According to the present invention, the noise generated by the power supply line can be reduced.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a power supply line according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a power supply system according to an embodiment of the present invention.

FIG. 3 is a configuration diagram of a power supply system according to another embodiment of the present invention.

FIG. 4 is a configuration diagram of a conventional electromagnetic coupling type non-contact power feeding system.

[Explanation of symbols]

11 ... High frequency power source, 12, 13 ... Power supply power source 21, 21
a to 21 g ... Forward line, 22, 22a to 22 g ... Return line.

Claims (1)

[Claims] 1. A feeder line arranged in two rows along a moving path, wherein the feeding lines in each row have forward lines and backward lines alternately arranged along a longitudinal direction of the moving path. Non-contact type power supply device characterized by