JP2001238371A - Non-contact feeder system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-contact feeder system, capable of turning off the power for a carrier vehicle on a track without having to the power supply to the primary feeder. SOLUTION: When a magnetic field is generated around the primary feeder 1 by a high-frequency power supply, voltage is induced at a secondary pickup coil 2. The induced voltage is rectified by a rectifier circuit 4 to generate desired DC power in constant-voltage circuit 5 and output it as the power for the carrier vehicle. To the output of the rectifier circuit 4, a thyristor 60 is connected. When the thyristor 60 is turned on, the output of the rectifier circuit 4 is short- circuited. As a result, the output voltage of the constant-voltage circuit 5 becomes 0 V, and the power for the carrier vehicle is turned off.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art FIG. 6 is a block diagram showing an example of a conventional wireless power supply. In this device, a voltage is induced in a pickup coil 2 magnetically coupled to the power supply line 1 by a magnetic field generated when a high-frequency current flows through the power supply line 1 on the primary side. Is configured to transmit power. The pickup coil 2 and the capacitor 3 constitute a resonance circuit, which reduces reactive power and increases power transmission efficiency. The output of the pickup coil 2 is rectified by the rectifier circuit 4, stabilized by the constant voltage circuit 5, and supplied to the inverter 6 and the like. The inverter 6 is a power supply circuit of the linear motor 7 in this case,
The output of the constant voltage circuit 5 is converted into an AC having an appropriate frequency.

[0003]

When a failure occurs in a carrier, it is necessary to turn off the power of the carrier on the track. However, in the case of the prior art, in order to turn off the power of the carrier, the carrier is removed from the track or the power supply to the power supply line 1 on the primary side is stopped, and no power is induced on the secondary side. I have to do it.

The present invention has been made in view of the above circumstances, and provides a non-contact power supply device capable of turning off the power of a carrier on a track without stopping power supply to a primary power supply line. The purpose is to provide.

[0005]

In order to solve the above-mentioned problems, the present invention has the following arrangement. The invention according to claim 1 includes a primary power supply line to which a high-frequency current is supplied, a secondary pickup coil provided on a moving body and taking out power by electromagnetic coupling in resonance with the primary power supply line, In a non-contact power supply device that rectifies the output of the secondary-side pickup coil and temporarily converts it to DC power through a stabilized power supply circuit, the output side of the rectification circuit that rectifies the output of the secondary-side pickup coil is turned on when an abnormality occurs. A thyristor is inserted. According to a second aspect of the present invention, in the non-contact power supply device, a normally closed contact type switch is connected in series to the thyristor.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram illustrating a configuration of a wireless power supply device according to an embodiment of the present invention. In FIG. 1, 1 is a primary-side feeder line, 2 is a pickup coil, 3 is a resonance capacitor, 4 is a rectifier circuit, 5 is a constant voltage circuit, 6 is an inverter, and 7 is a linear motor. 6 is the same as that shown in FIG. According to the present invention, in the conventional circuit shown in FIG. 6, a thyristor 60 is inserted on the output side of the rectifier circuit 4 to turn on the thyristor 60 and short-circuit the secondary side to cut off the power supply circuit.

FIG. 2 shows a configuration of a firing circuit 620 for controlling conduction of the thyristor 60. In FIG. 2, 622 and 623 are resistors for dividing the voltage rectified by the rectifier circuit 4, and are connected in series between the anode and the cathode of the thyristor 60. 625 is a Zener diode having a predetermined breakdown voltage, and its cathode is connected to a connection point 624 between the resistors 622 and 623.

The diode 626 is useful when controlling the conduction of the thyristor 60 by applying a signal from another circuit (not shown) to the gate terminal 61 of the thyristor, and the signal does not flow backward to the zener diode 625 side. It is for taking measures. This diode 626
May be provided as needed. Reference numeral 627 denotes a resistor connected between the gate terminal 61 of the thyristor 60 and the cathode, for maintaining the thyristor 60 in an off state during normal operation (when power is established). 628 is the gate terminal 61 of the thyristor 60
And a noise absorbing capacitor connected between the capacitor and the cathode.

Next, the operation of the first embodiment will be described. For example, consider a case where the switching operation of the constant voltage circuit 5 is not performed normally and an overvoltage occurs between the anode and the cathode of the thyristor 60. The voltage at the node 624 increases due to the overvoltage, and when the voltage exceeds the breakdown voltage, the Zener diode 625 conducts. As a result, the voltage at the connection point 624 is applied to the gate terminal 61, and the thyristor 60 is turned on. Therefore, the output voltage of the constant voltage circuit 5 becomes 0 V, and the power is turned off.

According to the first embodiment, when an overvoltage occurs in the secondary side device due to, for example, a failure in the switching function of the constant voltage circuit 5, the thyristor 60 is turned on, and the power supply of the carrier is automatically turned on. Off. Therefore, it is possible to effectively avoid a secondary failure due to an overvoltage in the device.

FIG. 3 shows another configuration example 1 of the ignition circuit.
The ignition circuit 630 shown in FIG. 3 is configured to detect an abnormal voltage outside the apparatus (output voltage of the non-contact power supply apparatus) and automatically turn off the power of the carrier. In FIG.
Reference numeral 101 denotes a ground wiring inside the carrier, to which a cathode of the thyristor 60 and the like are connected. Power supply wiring 102
Is connected to the output terminal of the constant voltage circuit 5, and is supplied with the output voltage of the contactless power supply device.

A comparator 631 compares the voltage of the power supply wiring 102 with the reference voltage of the reference voltage source 632.
3 is an output part of the comparator 631 and the ground wiring 10
1, a resistor 634 is connected between the power supply line 102 and the collector of the transistor 634, and a transistor 634 is connected between the power supply line 102 and the collector of the transistor 634. The load resistance. 636, 637, 638
Are the diode 626, the resistor 627,
They correspond to the capacitors 628, respectively.

FIG. 4 shows another configuration example 2 of the ignition circuit.
The ignition circuit 610 shown in FIG. 4 is configured to manually turn off the power of the carrier when an abnormality occurs. In FIG.
11 is a DC power supply. Reference numeral 612 denotes a normally open contact type switch which is normally off, and one end is connected to the DC power supply 611 and the other end is connected to the gate terminal 61 of the thyristor 60 via the diode 613. The switch 612 can be manually turned on / off, and an operator turns on the switch 612 when an abnormality occurs. 613, 614, and 615 correspond to the diode 626, the resistor 627, and the capacitor 628 shown in FIG.

<Second Embodiment> A non-contact power supply device according to a second embodiment of the present invention will be described below. As shown in FIG. 5, the contactless power supply device according to the second embodiment is a device in which a normally closed contact switch 80 is further connected in series to the thyristor 60 in the device configuration of the first embodiment. , So that the power of the carrier can be turned on again.
That is, in FIG. 5, the thyristor 60 and the switch 80 are connected in series with the surge noise blocking diode 90 on the output side of the rectifier circuit 4.

Reference numeral 91 is used to stabilize the anode potential of the thyristor 60 when the switch 80 is turned off, thereby preventing the thyristor 60 from malfunctioning. Reference numeral 92 denotes a component for bypassing a current component caused by the inductance component of the switch 80, and for causing the thyristor 60 to quickly transition to the off state. 93 is a resistor, and 94 is a capacitor. The resistor 93 and the capacitor 94 function as a noise absorber for stabilizing the potential between the anode and the cathode of the thyristor 60. Diode 90, resistors 91 and 93, diode 92, capacitor 9
4 may be provided as needed.

Next, the operation of the non-contact power feeding device will be described by taking as an example a case where the thyristor 60 is turned off and the power is turned on again from an off state. Embodiment 1
As described above, when the power supply of the transport vehicle is turned off and thereafter the power supply is turned on again, the switch 80 is turned off to prevent conduction of the thyristor 60. As a result, the pickup coil comes out of the short-circuit state, a voltage is generated on the secondary side,
An output is also generated on the output side of the rectifier circuit 4, and the power of the carrier is turned on.

According to the second embodiment, the thyristor 6
No large voltage is applied to the switch 80 whether 0 is in the on state or the off state. That is, when the thyristor 60 is on, the switch 80 is also on. In this case, the voltage between both terminals of the switch 80 is 0V. When the thyristor 60 is off, one terminal of the switch 80 (the anode-side terminal of the thyristor 60) is in a floating state and an absorber is provided. No voltage is applied. Therefore, the switch 80 does not need to be a switch with a high withstand voltage specification, and a relatively small switch is sufficient.

[0018]

As described above, according to the present invention, the output of the rectifier circuit can be short-circuited, and this state can be maintained even when the power is off. Therefore, it is possible to turn off the power of the carrier on the track without stopping the power supply to the primary power supply line.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a wireless power supply device according to Embodiment 1 of the present invention.

FIG. 2 is a circuit diagram showing a configuration of a firing circuit according to Embodiment 1 of the present invention.

FIG. 3 is a circuit diagram showing another configuration example 1 of the ignition circuit according to the first embodiment of the present invention;

FIG. 4 is a circuit diagram showing another configuration example 2 of the ignition circuit according to the first embodiment of the present invention;

FIG. 5 is a circuit diagram showing a characteristic portion of the wireless power supply device according to Embodiment 2 of the present invention.

FIG. 6 is a block diagram illustrating an example of a non-contact power supply device according to the related art.

[Explanation of symbols]

 1; power supply line 2; pickup coil (secondary side) 3: capacitor (for resonance) 4: rectifier circuit 5; constant voltage circuit 6; inverter 7; linear motor 60; thyristor 80; switch (normally closed contact type) 610; 620, 630; ignition circuit

Claims (2)

[Claims] 1. A primary-side power supply line to which a high-frequency current is supplied, a secondary-side pickup coil provided on a moving body and taking out electric power by electromagnetic coupling in resonance with the primary-side power supply line, and the secondary-side pickup In a non-contact power supply device that rectifies the coil output and temporarily converts it to DC power through a stabilized power supply circuit, a thyristor that is turned on when an abnormality occurs is inserted into the output side of the rectifier circuit that rectifies the output of the secondary pickup coil. A non-contact power supply device characterized by the following. 2. The non-contact power supply device according to claim 1, wherein a normally closed contact type switch is connected in series to the thyristor.