JP3339421B2 - Contactless power supply system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply system for supplying electric power to a moving body in a non-contact manner.

[0002]

2. Description of the Related Art Heretofore, it has been practiced to transport parts and luggage using a transport vehicle that travels on a predetermined transport path in a factory or a warehouse. As a method for supplying electric power to such a transport vehicle, a non-contact power supply system for supplying electric power to the transport vehicle from a power supply via a power supply line without contact has been realized.
In a non-contact power supply system, AC power is supplied from a power supply to a power receiving core of a transport vehicle via a power supply line. The power supply line is composed of two power supply lines, and a power receiving core is inserted between the two power supply lines to receive power supply.

[0003]

In the above-described non-contact power supply system, if the power supply line is lengthened in order to extend the moving distance of the carrier, the impedance of the power supply line increases, the reactive power increases, and the efficiency of the power supply increases. However, there is a problem that the temperature is reduced.

An object of the present invention is to increase the efficiency of a power supply in a wireless power supply system.

[0005]

According to the first aspect of the present invention,
In a non-contact power supply system for supplying power to a mobile unit in a non-contact manner from a power supply via a power supply line, a plurality of first switch means for separating or connecting adjacent sections when the power supply line is divided into a plurality of sections. And a plurality of capacitors for compensating for the inductance of the feeder line, a plurality of second switch means for short-circuiting one end of the feeder line in the plurality of sections for each section, and a closed section from the power supply to the section where the moving object exists. Control means for controlling the first and second switch means so that

According to the first aspect of the present invention, power can be supplied only in a closed section from a power source to a section in which a moving body is present. The reactive power due to the inductance of the feeder line in the previous section can be reduced, and the efficiency of the power supply can be increased. Furthermore, by canceling the inductance of the power supply line in the closed section by the capacitor, the reactive power due to the inductance in the closed section can be reduced.

Further, the control means specifies, for example, in which section of the plurality of sections the moving body transmitted from the moving body is located based on position information indicating which section of the plurality of sections is present. Then, the first and second switch means are controlled so that the section from the power source to the section where the moving object is present is a closed section, and power is supplied only to the closed section.

Alternatively, the position of the moving body is detected by a contact sensor, a non-contact sensor, or the like, a detection signal from the sensor is received by the control means, and the control means controls the first and second switch means based on the detection signal. It can also be configured to control.

Thus, there is no need to supply power,
Since power is not supplied to the section (as viewed from the power source) beyond the section in which the moving object exists, the reactive power due to the inductance of the power supply line other than the closed section can be reduced.

Further, when transmitting the position information from the moving body to the control means on the power supply side, a communication line for transmitting the position information is provided by superimposing the position information on the current flowing through the power supply line and transmitting the position information. There is no need.

Further, a capacitor for compensating for the inductance in the closed section of the power supply line may be arranged for each section. This makes it possible to cancel the inductance of the power supply line in the closed section for each section, regardless of the section from the power source to any section.

According to a sixth aspect of the present invention, in the non-contact power supply system for supplying power to a moving body from a power supply via a power supply line in a non-contact manner, when the power supply line is divided into a plurality of sections,
A plurality of first switch means for separating or connecting adjacent sections; a plurality of second switch means for short-circuiting one end of the feed line for each section; and a plurality of switch means connected between the power supply and the feed line;
A plurality of capacitors connected in parallel with each other, a plurality of third switch means for determining which of the plurality of capacitors is to be connected to the power supply line, and a section from the power supply to a section where the moving object exists; Control means for controlling the first and second switch means so as to form a section.

According to the present invention, electric power can be supplied only in a closed section from the power supply to the section where the moving body is present. The power can be reduced and the efficiency of the power supply can be increased. Further, by controlling the third switch means to change the capacitance of the capacitor, the inductance of the feed line in the closed section can be compensated, so that the reactive power due to the inductance of the feed line in the closed section can be reduced. Can be.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. This embodiment relates to a non-contact power supply system in which power is supplied from a power supply line to a carrier (moving body) used in a factory, a warehouse, or the like, and the carrier travels by receiving the power in a non-contact manner. is there.

FIG. 1 is a system configuration diagram of a wireless power supply system according to a first embodiment of the present invention.

The high-frequency power supply 11 is a circuit for converting a commercial frequency AC voltage into a high-frequency AC voltage and supplying the AC voltage to a power supply line 16. A modem 13 for modulating and demodulating the transmitted data, and switches 21, 22,.
... CPU (control means) 14 for controlling ON and OFF of m
And an antenna 15 for transmitting and receiving wireless signals to and from the carrier 12.

A power supply line 16 for supplying electric power to the transport vehicle 12 is divided into a plurality of sections, and switches 21, 22... N for separating adjacent sections for each section, and a power supply for each section. Switches 31 and 32 for short-circuiting the ends of electric wires
.. M and capacitors 41, 42, 43... K for compensating for the inductance of the feeder line 16 in each section. Note that switches 21, 22,... N for separating adjacent sections are provided for the two power supply lines 16, respectively.

The transport vehicle 12 receives electric power from a power receiving core (not shown) in a non-contact manner and travels on rails 20 by a motor. The carrier 12 includes a modem 18 for modulating and demodulating data.
And an antenna 19 for transmitting and receiving wireless signals to and from the high-frequency power supply 11 and a CPU 17 for controlling a motor in accordance with a command from the CPU 14 of the high-frequency power supply 11. The CPU 17 of the transport vehicle 12 calculates its own position from information such as the number of rotations and the rotation direction of the motor, and transmits the calculated position information by superimposing the calculated position information on the current flowing through the power supply line 16.

Next, the operation of the contactless power supply system having the above-described configuration will be described. The transport vehicle 12 counts the number of rotations of the motor using an encoder or the like, and calculates the position of the transport vehicle 12. Then, the calculated position information is modulated by the modem 18 and superimposed on the current flowing through the power supply line 16 and transmitted.

The CPU 14 of the high-frequency power supply 11
6 is received via the modem 13 and transmitted in a manner superimposed on the current flowing in the current flowing through the switch 6, the section where the carrier 12 is located is specified based on the location information, and a switch to the section where the carrier 12 is located is specified. , N are turned on,
Switches 21, 22,... Connecting the section and an adjacent section
Or n is turned off, and switches 31, 32,... Or m at the end of the section where the transport vehicle 12 is present are turned on to form a closed section.

For example, when the transport vehicle 12 exists in the second section L2 of the feeder line 16 as shown in FIG.
The PU 14 turns on the switch 21 and turns off the switch 22, and feeds the power supply lines 16 in the sections L3 to Ln earlier than the section L2.
Is disconnected from the high frequency power supply 11, and at the same time, the switch 31 is turned off and the switch 32 is turned on to form a closed section including the sections L1 and L2. Then, power is supplied from the high-frequency power supply 11 only in the closed section.

As a result, power is not supplied to sections that are not related to the driving of the transport vehicle 12, so that reactive power due to the inductance of the feeder line 16 in those sections can be reduced. Further, since the inductance of the feeder line 16 in each section constituting the closed section is canceled by the capacitors 41, 42, or k provided for each section, the feeder line connected to the high-frequency power supply 11 16 can also reduce the reactive power. In addition, since the transmission of the position information from the carrier 12 to the CPU 14 of the high-frequency power supply 11 is performed using the power supply line 16, there is no need to provide a signal line separately from the power supply line 16, and the system configuration can be simplified.

Next, FIG. 2 shows the high-frequency power supply 11 and the power supply line 1.
6, a plurality of capacitors 51, 52, 53,.
Are connected in parallel, and the capacitors 51, 52, 53,.
A plurality of switches 61, 62, 63 for switching the connection of k
.. N is a system configuration diagram of a second embodiment of the present invention provided with n.

In the second embodiment, the capacitors 51, 52, 53... K and the switches 61, 62,
The parts other than 63... N are the same as those in the first embodiment of FIG. 1, and the power supply line 16 is divided into a plurality of sections, and switches 21, 22. , Short-circuiting the ends of the sections to form closed sections.

The switches 61, 62, 63... N are connected in series to the capacitors 51, 52, 53... K, respectively, and the capacitors 51, 52, 53. N are connected in parallel with each other as one set. These switches 61, 62, 63
.. N is turned on by the CPU 14 in the high frequency power supply 11,
Controlled off. The capacitors 51, 52, 53,... K and the switches 61, 62, 63,.

The capacitor 51 is connected to the first section L
The capacitor 62 has a capacity to cancel the inductance of the feed line 16 of the first feed line 16 in the second section.
The capacitance is set so as to cancel the inductance of No. 6. Similarly, the capacitors 53... K are set to have a capacity for canceling the inductance of the feeder line 16 in the section L3.

For example, when it is detected that the transport vehicle 12 exists in the first section L1 as viewed from the high frequency power supply 11, the CPU 14 of the high frequency power supply 11
1 is turned off and the switch 31 is turned on to form a closed section consisting of only the section L1. At the same time, the switch 61 is turned on, the capacitor 51 is connected in series to the power supply line 16, and the inductance of the power supply line 16 in the section L1 is reduced by the capacitor 61.
To cancel.

If it is detected that the transport vehicle 12 is present in the second section L2, the CPU 14 turns on the switch 21, turns off the switch 22, and turns off the switch 31.
Is turned off and the switch 32 is turned on to form a closed section including the sections L1 and L2. At the same time, the switches 61 and 62 are turned on, the capacitors 51 and 52 are connected in parallel, and a pair of capacitors connected in parallel are connected in series to the feed line 16 to reduce the inductance of the feed line 16 in the sections L1 and L2. Cancel.

According to the second embodiment, similarly to the first embodiment, the high-frequency power supply 11 supplies
Power is supplied only in the closed section up to the section where 2 exists,
Since power is not supplied to a section where the transport vehicle 12 does not exist, even when the power supply line 16 is long, it is possible to reduce reactive power due to inductance of the power supply line 16 and the like. Furthermore, since the capacitors 51, 52, 53,... K for canceling the inductance of the feeder line 16 in the closed section are arranged together, the wiring of the feeder line 16 is simpler than that in which a capacitor is arranged for each section. become.

In the above-described first embodiment, the capacitors 41, 42, 43,... K are provided in units of sections, but one capacitor is used not for each section but for a plurality of sections. Is also good. Switches 21, 22
As n, 31, 32... M, an electromagnetic switch, a semiconductor switch, or the like can be used.

Further, in the above-described first embodiment,
The transport vehicle 12 detects its own position and transmits the detected position information to the CPU 14 of the high-frequency power supply 11 by superimposed communication. However, a contact-type sensor that detects the position of the transport vehicle 12 on the transport path or an optical sensor A large number of non-contact sensors such as sensors are arranged, and signals from the sensors
The PU 14 may receive the information to specify the position of the carrier 12. Alternatively, the CPU 14 of the high-frequency power supply 11
A power supply section necessary for the travel may be calculated from a travel command signal transmitted from the vehicle to the transport vehicle 12, and a switch may be turned on and off so that power is supplied only to the calculated section.

The capacitors 51, 52, 53... K
The connection method of the switches 61, 62, 63,... N is not limited to the method described in the second embodiment, but may be another connection method.

[0033]

According to the present invention, by forming a closed section from the power supply to the section where the moving object is present and supplying power only to the power supply line in the closed section, the reactive power is reduced and the efficiency of the power supply is reduced. Can be improved. In addition, since the inductance in an arbitrary closed section of the power supply line can be canceled by the capacitor, the reactive power due to the inductance of the power supply line can be reduced.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of a wireless power supply system according to a first embodiment.

FIG. 2 is a system configuration diagram of a wireless power supply system according to a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 High frequency power supply 12 Carrier 14 CPU of high frequency power supply 18 CPU of carrier 16 Power supply line 21,22 ... n, 31,32 ... m Switch 41,42 ... k Capacitor

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B60M 7/00 B60L 5/00 H02J 17/00

Claims (8)

(57) [Claims] 1. A non-contact power supply system for supplying electric power from a power source to a moving body in a non-contact manner via a power supply line, wherein when the power supply line is divided into a plurality of sections, adjacent sections are separated or connected. A first switch means, a plurality of second switch means for short-circuiting one end of a feed line of the plurality of sections for each section, a plurality of capacitors for compensating for an inductance of the feed line, and Control means for controlling the first and second switch means so that the section where the moving object is present is a closed section. 2. The method according to claim 1, wherein the control unit is configured to determine a section in which the moving body is located based on position information indicating in which of the plurality of sections the moving body transmitted from the moving body is located. The second switch means connected to one end of the power supply line is turned on, and the corresponding first switch means from the power supply to the section where the moving body is present is turned on. Turning off the corresponding first switch means so as to separate the power supply line in the previous section, forming a closed section from the power supply to the section in which the moving body is present, and supplying power only from the power supply to the closed section. The wireless power supply system according to claim 1, wherein 3. The control means detects in which of the plurality of sections the mobile unit is located, and short-circuits one end of a power supply line in the section in which the mobile unit is located. The second switch means is turned on, and the corresponding first switch means from the power supply to the section where the moving object is present is turned on, so that the section earlier than the section where the moving object is present is separated. 2. The power supply system according to claim 1, wherein the first switch is turned off to form a closed section from the power supply to a section where the moving body is present, and power is supplied only from the power supply to the closed section. Contactless power supply system. 4. The non-contact power supply system according to claim 2, wherein the transmission of the position information from the mobile body to the control means is performed by superimposed communication using the power supply line. 5. The non-contact power supply system according to claim 1, wherein the capacitors are arranged for each section. 6. A non-contact power supply system for supplying electric power from a power source to a moving body in a non-contact manner via a power supply line, wherein when the power supply line is divided into a plurality of sections, adjacent sections are separated or connected. A first switch means, a plurality of second switch means for short-circuiting one end of the power supply line for each section, and a plurality of capacitors connected between the power supply and the power supply line and connected in parallel with each other. A plurality of third switch means for determining which one of the plurality of capacitors is to be connected to a power supply line; and the first and second switch means so that a section from the power source to a section where the moving body is present is a closed section. Control means for controlling the second switch means and controlling the third switch means so as to compensate for the inductance in the closed section by the plurality of capacitors. Contactless power supply system according to. 7. The section, in which the mobile unit is located, based on position information indicating in which of the plurality of sections the mobile unit transmitted from the mobile unit is located. The corresponding second switch means is turned on so as to short-circuit one end of the power supply line, and the corresponding first switch means is turned on from the power supply to a section where the moving body exists, and the moving body is present. Turning off the corresponding first switch means so as to separate the power supply line in a section ahead of the section to be formed, forming a closed section from the power supply to the section in which the moving object is present, and providing a power supply line in the closed section. 7. The method according to claim 6, wherein the third switch means is turned on or off so as to compensate for the inductance of the capacitor, and the capacitor having a desired capacitance is connected between the power supply and the power supply line. Touch the power supply system. 8. The control means detects in which section of the plurality of sections the moving body is located, and detects one end of a feeder line of the section in which the moving body is detected by the detecting means. Is turned on, the corresponding second switch means is turned on, and the corresponding first switch means is turned on until the section in which the moving body is present, and the section ahead of the section in which the moving body is present is turned on. The corresponding first switch means is turned off so as to be separated, a closed section is formed from the power supply to a section where the moving body is present, and the first section is so compensated for an inductance of a feeder line in the closed section. 7. The wireless power supply system according to claim 6, wherein said switch means is turned on or off to connect said capacitor having a desired capacity between said power supply and a power supply line.