JPH11164497A - Non-contact feeder system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-contact feeder system involving a protective circuit which is capable of preventing a pick-up coil or an element from being heated excessively due to the occurrence of some abnormality. SOLUTION: When high frequency current flows through a primary electric supply line 1 during a normal condition, electric power is transmitted with non-contact to a pick-up coil 2 by a generating magnetic field. The output of the coil 2 is rectified at a rectifying circuit 4, stabilized at a constant voltage circuit 5, converted into an alternating current at an inverter 6, so as to be outputted to a linear motor 7. If any abnormality occurs in a non-contact feeder system, overcurrent flows through the pick-up coil 2, the temperature of the coil 2 rises, and the output of a temperature sensor 8 exceeds a fixed level, a signal for alarming an abnormal condition is outputted from a detection circuit 9, and is supplied to a relay Ry. As a result, the relay is driven, and a NO contact (ry) is turned on, so that a section between both ends of the pick-up coil 2 is short circuited, and power supply to circuits on the downstream side of the rectifying circuit 4 is stopped.

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 apparatus for supplying electric power to a motor-driven moving body in a non-contact manner.

[0002]

2. Description of the Related Art FIG. 5 is a block diagram showing a configuration of a conventional wireless power supply. In this device, a voltage is induced in a pickup coil 2 magnetically coupled to the primary feeder line 1 by a magnetic field generated when a high-frequency current flows through the primary feeder line 1, and the pickup coil 2 is not contacted with the primary feeder line 1. 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. The inverter 6 converts the output of the constant voltage circuit 5 into AC and outputs the AC to the linear motor 7.

[0003]

When the load after the rectifying unit 4 is released for any reason in the contactless power supply device, an overcurrent is generated in the pickup coil 2, and
An excessive voltage is applied to the resonance capacitor 3. Alternatively, if an abnormality such as a short circuit occurs in the linear motor 7, the output voltage of the inverter 6 decreases. In the inverter 6, if the voltage decreases to supply a constant power, the current increases, and as a result, Rectifier 4, constant voltage circuit 5,
An excessive current flows through the inverter 6, and when the circuit is released in this state, an excessive current also occurs in the pickup coil 2. As described above, when an overcurrent flows in an overload state or an abnormality such as a failure of an element occurs, each power supply circuit component generates heat.
If the heat is left undisturbed, there is a danger that these components may be overheated, broken or burnt. In addition, it is necessary to stop the power supply from the contactless power supply device due to a failure of another device or device.

To solve this problem, the pickup coil 2
Is a resonance circuit, so if this secondary circuit is short-circuited, it will escape from the resonance state and will be in a state like a CT (current transformer). Therefore, overheating due to an overcurrent flowing through the pickup coil 2 can be prevented. Further, since the input voltage of the constant voltage circuit 5 becomes almost 0 V, heat generation of the control element of the constant voltage circuit 5 can be prevented. That is, when any abnormality occurs in the contactless power supply device,
What is necessary is just to sense the heat generation of the pickup coil 2 and the control element and short-circuit the secondary side. Alternatively, pickup coil 2
It is sufficient to cut off the input from before the resonance capacitor 3.

[0005] However, the non-contact power supply device is used as a power supply, and all the circuit parts operate with the power from the pickup coil 2. Therefore, when the pickup coil 2 is short-circuited, the voltage of the constant voltage circuit 5 becomes almost 0 V, so that the power supply of the control system also becomes 0 V and the control circuit does not function. Therefore, if the pickup coil 2 is short-circuited by an electrical means such as a relay or a switching element (FET, transistor), the power supply of the control circuit is lost, so that the relay,
The switching element changes from the short-circuit state to the release state again, the power is turned on, and the switching element cannot escape from the overheated state.
In addition, since power is supplied again to another failed device or device, a secondary failure may occur.

The present invention has been made in view of such a point, and detects the heat generation of a pickup coil or an element, or a failure of another device or apparatus, and short-circuits the secondary side of the pickup coil or performs secondary operation. Non-contact power supply that shuts off the side input section and maintains the short-circuit state even if the control circuit power supply is lost, eliminating problems associated with the loss of control power supply and preventing overheating of the pickup coil and elements. It is intended to provide a device.

[0007]

According to the first aspect of the present invention,
A primary-side electric wire to which a high-frequency current is supplied, a secondary-side pickup coil that takes out power by electromagnetic coupling in resonance with the primary-side electric wire, and rectifies the secondary-side pickup coil output, via a stabilized power supply circuit, In a non-contact power supply device that outputs a DC power, a mechanical latch type relay that is turned on in response to an abnormal signal generated outside the device or inside the device is inserted between both ends of the pickup coil or between output ends of the rectifier circuit. It is a non-contact power supply device characterized by the following. According to a second aspect of the present invention, a primary-side electric wire supplied with a high-frequency current, a secondary-side pickup coil for extracting electric power by electromagnetic coupling in resonance with the primary-side electric wire, and rectifying the secondary-side pickup coil output. ,
In a non-contact power supply device that outputs as a DC power supply through a stabilized power supply circuit, a mechanical latch relay that is turned off upon receiving an abnormal signal generated outside or inside the device on a series path between the pickup coil and a resonance capacitor. Is a non-contact power supply device characterized by inserting a. According to a third aspect of the present invention, in the wireless power supply device according to any one of the first to third aspects, the abnormal signal is a signal generated when the temperature of the pickup coil exceeds a predetermined value. There is a feature.

[0008]

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 block diagram illustrating a configuration of a non-contact power supply device according to an embodiment of the present invention, and FIG. 2 is a schematic cross-sectional view illustrating a configuration of a linear motor-type transfer device equipped with the non-contact power supply device. First, in FIG.
Reference numeral 21 denotes a ceiling frame.
Support frames 22, 22 extending vertically downward are attached, and a long plate-shaped track plate 23 is attached to lower ends of these support frames 22, 22. A guide frame 24 is mounted on the upper surface of the track plate 23. The guide frame 24 movably supports a linear motor type transfer device disposed therein, and has a bottom plate portion 24 in which a long plate-shaped permanent magnet 26 is attached at the center.
a and a vertical leg 2 connected to both ends of the bottom plate 24a.
4b, 24b, and substantially U-shaped guides 24c, 24c connected to the vertical legs 24b, 24b.

In the linear motor type transfer device provided inside the guide frame 24, reference numeral 27 denotes a horizontal frame, and a linear motor coil 28 faces the permanent magnet 26 at the center of the lower surface of the horizontal frame 27 in the left-right direction. The universal wheels 29 are mounted on the lower surface of the horizontal frame 27 with the linear motor coil 28 interposed therebetween. At the center of the upper surface of the horizontal frame 27, a block 30 in which a power supply for non-contact power supply and the like are housed is mounted, and branch mechanisms 31, 31 are mounted on side surfaces of the block 30.
Guide rollers 32, 32 are attached to the distal end portions of the guide rollers 1, 31. Guide rollers 33, 33 are also attached to both sides of the upper surface of the horizontal frame 27.

On the upper surfaces of the above-mentioned branch mechanisms 31, 31, E
Character-shaped magnetic cores 34, 34 are attached. FIG. 3 is an enlarged view of the magnetic core 34, and primary feeder lines 1 and 1 are arranged above and below the magnetic core 34. The primary power supply lines 1 and 1 are attached to one ends of the support members 35 and 35, and the other ends of the support members 35 and 35 are attached to the guide portion 24c of the guide frame 24. A mounting member 38 is mounted on the upper portion of the block 30, and a storage box 39 for storing the transported member is mounted on the mounting member 38.

Next, in FIG. 1, 1 is a primary power supply line (see FIGS. 2 and 3), 2 is a pickup coil (FIG. 3), 3
Is a resonance capacitor, 4 is a rectifier circuit, 5 is a constant voltage circuit,
Reference numeral 6 denotes an inverter, and reference numeral 7 denotes a linear motor including the coil 28 and the permanent magnet 26 shown in FIG. 2, and their configurations are the same as those shown in FIG. Next, differences from FIG. 5 will be described. In FIG. 1, 8 is a pickup coil 2
Is a temperature sensor for detecting the temperature of the sensor, and is connected to the detection circuit 9. The detection circuit 9 outputs an abnormal signal to the relay Ry when the output of the temperature sensor 8 exceeds a fixed value set inside. The relay Ry is a mechanical latch type relay. Once the contact is driven, the on / off state of the contact is maintained even if the power is turned off thereafter. N of this relay Ry
An O (normally open) contact ry is connected between both ends of the pickup coil 2.

Next, the operation of the above-described non-contact power feeding device will be described. First, if each part of the device is operating normally,
The operation is exactly the same as that of the device shown in FIG. Next, when an abnormality occurs in any of the rectifier circuit 4, the constant voltage circuit 5, the inverter 6, and the linear motor 7, and an overcurrent flows through the pickup coil 2, the temperature of the pickup coil 2 increases. When the temperature of the pickup coil 2 rises and the output of the temperature sensor 8 exceeds the above-mentioned fixed value, an abnormal signal is output from the detection circuit 9 and supplied to the relay Ry. As a result, the relay Ry is driven, the NO contact ry is turned on, and both ends of the pickup coil 2 are short-circuited. As a result, the output voltage of the rectifier circuit 4 becomes 0, and thus the output voltage of the constant voltage circuit 5 also becomes 0. However, the contact state of the relay Ry does not change, and the contact ry remains on.

As described above, according to the above-described embodiment, since the mechanical latch type relay Ry is used, the short-circuit state at both ends of the pickup coil 2 can be maintained even when there is no power supply in an abnormal state. According to the above-described embodiment, the NO contact ry of the relay Ry is inserted between both ends of the pickup coil 2, but may be inserted between the output terminals of the rectifier circuit 4 instead (see FIG. 1). Dashed line).

FIG. 4 is a diagram showing a configuration of a wireless power supply device according to another embodiment of the present invention. According to this embodiment, the mechanical latch type relay Ry is inserted in series with the NC (normally closed) contact rb pickup coil 2. As a result, when the temperature of the pickup coil 2 rises and the output of the temperature sensor 8 exceeds a certain value, the relay Ry
NC contact rb is turned off. As a result, the circuit of the pickup coil 2 is cut off, and the power supply to the circuits after the rectifier circuit 4 is stopped. In the embodiments of FIGS. 1 and 4 described above, the temperature of the pickup coil 2 is detected by the temperature sensor 8 and the abnormality of the circuit operation is detected by the result. Abnormality detection may be performed based on the temperature of an element that generates heat when an abnormality occurs, such as a rectifying element (such as a diode) and a control element (such as a transistor) in the constant voltage circuit 5. Further, the relay Ry may be driven by detecting any abnormality or failure other than the temperature, and furthermore, the relay Ry may be driven based on an abnormality signal from outside the device.
y may be driven.

[0015]

As described above, according to the present invention,
The pickup coil can be short-circuited or released at the time of abnormality, and the state can be maintained even without power.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a wireless power supply device according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view showing a configuration of a linear motor-type transfer device equipped with the contactless power supply device.

FIG. 3 is an enlarged view of the magnetic core of FIG. 2;

FIG. 4 is a diagram illustrating a configuration of a wireless power supply device according to another embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a non-contact power supply device mounted on a conventional linear motor type carrier.

[Explanation of symbols]

 Ry. Relay coil ry. Relay contact 2. Pickup coil 3. Capacitor 4. Rectifier circuit 5. Constant voltage circuit section 6. Inverter 7. Linear motor 8. Temperature sensor 9. Detection circuit

Claims (3)

[Claims] 1. A primary electric wire supplied with a high-frequency current,
In the non-contact power feeding device that rectifies the output of the secondary-side pickup coil, rectifies the output of the secondary-side pickup coil, and outputs the DC power as a DC power, A non-contact power supply device, wherein a mechanical latch type relay which is turned on in response to an abnormal signal generated outside or inside the device is inserted between both ends of the pickup coil or between output ends of the rectifier circuit. 2. A primary-side electric wire supplied with a high-frequency current,
In the non-contact power feeding device that rectifies the output of the secondary-side pickup coil, rectifies the output of the secondary-side pickup coil, and outputs the DC power as a DC power, A non-contact power feeding device, wherein a mechanical latch type relay that is turned off in response to an abnormal signal generated outside or inside the device is inserted into a series path between the pickup coil and the resonance capacitor. 3. The wireless power supply according to claim 1, wherein the abnormal signal is a signal generated when the temperature of the pickup coil exceeds a predetermined value. apparatus.