JPH1118206A - Non-contacting feeding device for traveling object - Google Patents

Abstract

PROBLEM TO BE SOLVED: To more surely prevent the breakage of a power receiving circuit caused by a voltage rise, which occurs when disconnection, etc., is made. SOLUTION: A monorail-type carrying device is constituted of a monorail and carrying trucks which run on the monorail. A power transmission line is installed to the monorail, and a high-frequency current is made to flow through the transmission line, so that electric power is supplied to power- receiving devices 21 of the trucks in non-contacting states. Each power receiving device 21 is provided with a pickup unit section 25, which generates an electromotive force by electromagnetic induction, a current short-circuiting section 26, a current/voltage converting and regulating section 27 which regulates a prescribed voltage from the electromotive force generated by means of the unit section 25, and a voltage-detecting section 28 which detects the circuit voltage of the power receiving device 21, etc. When the voltage value detected by means of the voltage-detecting section 28 exceeds a prescribed value, the current short-circuiting section 26 is actuated and short-circuits the circuit of the power receiving circuit 21. At the same time, it maintains the short-circuiting state until the power supply to the monorail-type carrying device 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 apparatus for a moving body, which supplies power to a moving body moving on a track such as a monorail by electromagnetic induction.

[0002]

2. Description of the Related Art Conventionally, there have been known various power supply devices for supplying electric power from an external source to a moving body such as a carriage for carrying articles, which travels along an elevated monorail.
In recent years, a non-contact type power supply device has been used as a device capable of preventing generation of dust or sparks due to wear at a sliding contact portion.

In this device, a power transmission line is arranged along a rail track on which a moving body travels, and the power transmission device is connected to the power transmission line so that a high-frequency current flows through the power transmission line. A power receiving device including a pickup unit having a power receiving coil, a rectifying unit connected to the coil, and a power converting unit connected to the rectifying unit and adjusting an output thereof to a predetermined voltage. An induced electromotive force corresponding to the flowing high-frequency current is generated in the pickup coil, and the power is supplied to a load such as a motor for driving the vehicle via a rectifying unit and a power converting unit.

[0004]

In this type of non-contact type power supply device, an induced electromotive force is always generated in the pickup section during operation, and a constant current circuit is provided on the power supply side to flow through the transmission line. The high-frequency current is maintained at a constant current. Therefore, if a break occurs in the power receiving circuit, the voltage in the circuit may rise abnormally and break the circuit.

[0005] By the way, this type of conventional device is generally provided with the above-described power conversion unit and a discharge circuit for performing discharge in accordance with a power consumption state or the like, so that a voltage rise is suppressed. Has become.

However, in the case where the power converter, the discharge circuit, or the like has a disconnection or an open state of the element, the rise in voltage cannot be suppressed, and there is a possibility that the circuit may still be destroyed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and can effectively perform fail-safe operation at the time of disconnection and the like, and can more reliably prevent the power receiving circuit from being damaged due to an abnormal rise in voltage. It is an object of the present invention to provide a non-contact power supply device for a mobile body that can prevent the power supply from being lost.

[0008]

The invention according to claim 1 is
A power transmission line for flowing a constant high-frequency current is arranged along a track, and a moving body moving on the track, a power receiving device for generating an induced electromotive force by the high-frequency current, and connected to an output side of the power receiving device. And a detecting means for detecting a circuit voltage, and outputting a signal when a voltage value detected by the detecting means exceeds a predetermined threshold value. A comparison means and a short-circuit means for short-circuiting a circuit in accordance with an input of an output signal from the comparison means and self-holding the short-circuit state are provided.

According to this device, when the voltage in the circuit of the power receiving device exceeds the threshold value, the short-circuiting means operates to short-circuit the circuit, and this short-circuit state is maintained. This allows
The rise in voltage is effectively suppressed.

According to a second aspect of the present invention, in the device according to the first aspect, the power receiving device has a pickup unit having a power receiving coil, a rectifying unit connected to the coil, and a rectifying unit connected to the rectifying unit. And a power conversion adjusting unit for adjusting the voltage to a predetermined voltage, wherein the short-circuit means is interposed between the rectifying unit and the power conversion adjusting unit.

According to this device, it is possible to reliably protect many parts of the output side circuit of the power receiving device.

Further, the invention according to claim 3 is based on claim 1.
Or in the device according to 2, wherein the comparing means is CP
There are provided software comparing means using U and hardware comparing means comprising an electric circuit whose energization state changes when an input voltage corresponding to a detected voltage value exceeds a predetermined level.

According to this device, as long as all the comparison means are not damaged, the short-circuit means operates in response to a signal output from any of the comparison means. Therefore, it is possible to more reliably operate the short circuit means.

According to a fourth aspect of the present invention, in the device according to any one of the first to third aspects, the short-circuit means is constituted by a thyristor for short-circuiting a current source circuit in response to a signal input from the comparison means. It was done.

According to this device, it is possible to configure the fail safe with a simple circuit.

[0016]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 and FIG. 2 schematically show a monorail type transfer device to which a non-contact type power supply device according to the present invention is applied. In these figures, reference numeral 1 denotes a monorail, which is disposed in an elevated state in a factory or the like and supported on a ceiling portion via a bracket 2.

A transmission line 4 is arranged on one side of the monorail 1. The transmission line 4 is connected to the power supply device 5 at one end of the monorail 1 and is attached to the side surface of the monorail 1 via a hanger 1a in a state of being folded at the other end of the monorail 1 to form a loop.

On the monorail 1, a carrier 3 is movably supported. The transport vehicle 3 includes a traveling wheel 6 that rolls on the monorail 1, guide rollers 7 that abut on upper side surfaces, lower side surfaces and a lower surface of the monorail 1.
8 and a motor 9 for driving the traveling wheels 6 and the like, and a pickup unit 10 as a power-supplied body to which power is supplied from the transmission line 4 by electromagnetic induction. The pickup unit 10 is one of the components of a power receiving device 21 described later, and has a cross section E made of a magnetic material.
It has a U-shaped core member 11, and a pickup coil 12 wound around a central protruding portion 11a of the core member 11, and is disposed so as to correspond to the transmission line 4 disposed on the monorail 1. I have. When an alternating current flows through the transmission line 4, a magnetic flux is formed using the core member 11 as a magnetic path, and an electromotive force is generated in the pickup coil 12 by electromagnetic induction, and this is generated by the power receiving device 21 and the bogie control unit 20 described below. Through the motor 9.

FIG. 3 is a block diagram showing a control system of the carrier 3.

As shown in FIG. 1, the carriage 3 has a carriage control unit 20, a power receiving device 21, and the motor 9
And a driving unit 22 such as a chuck device for holding other members, and the power receiving device 21 and the driving unit 22 are electrically connected to the bogie control unit 20, respectively. Is controlled.

The power receiving device 21 includes the pickup unit 25 for generating electromotive force due to electromagnetic induction, and a current short-circuiting portion 2 for grounding a power supply line of the power receiving device 21.
6 (short circuit means), a current / voltage conversion adjustment unit 27 (power conversion adjustment unit) for adjusting the electromotive force generated by the pickup unit unit 25 to a predetermined voltage, a voltage detection unit 28 for detecting the circuit voltage of the power receiving device 21, and A discharge circuit unit 29 and the like are provided, and the adjusted power is supplied to the bogie control unit 20. Then, while the current is further supplied to the driving unit 22 via the truck control unit 20, a part of the current supplied from the power receiving device 21 to the truck control unit 20 is supplied to the power receiving device 21 as a control power. ing.

The power receiving device 21 is provided with a voltage adjustment control unit 30, and the current / voltage conversion adjustment unit 27 and the voltage detection unit 28 are connected to the voltage adjustment control unit 30. The voltage adjustment control unit 30 is configured to output a command signal to the current / voltage conversion adjustment unit 27 so that a predetermined voltage is obtained according to the voltage detected by the voltage detection unit 28. Therefore, in the power receiving device 21, the pickup unit side functions as a constant current circuit (current source circuit), while the current / voltage conversion adjustment unit 27 functions as a constant voltage circuit.

The power receiving device 21 further includes a hardware overvoltage detection unit 31 and a CPU 32, and a gate trigger circuit unit 3 connected to the hardware overvoltage detection unit 31, the CPU 32, and the current short circuit unit 26, respectively.
3 are provided. The hardware overvoltage detection unit 31 and the CPU 32 are connected to the voltage detection unit 28, respectively, and the CPU 32 is further connected to the discharge circuit unit 29 and the bogie control unit 20.

Hardware Overvoltage Detector 31 and CP
U32 constitutes hardware comparing means and software comparing means, each of which has a comparison value (threshold) of the voltage value detected by the voltage detecting section 28, and the detected voltage value exceeds this threshold value. And outputs a signal to the gate trigger circuit unit 33.
In particular, the CPU 32 has three types of thresholds (V ₀ <V ₁ <V ₂ ) as the above-mentioned thresholds: an adjustment level (V ₀ ), a dangerous voltage level (V ₁ ), and an overvoltage level (V ₂ ). When the detected voltage value exceeds the overvoltage level (V ₂ ), a signal is output to the gate trigger circuit unit 33. In other cases, that is, when the detected voltage value exceeds the adjustment level (V ₀ ), discharge is performed. Dangerous voltage level (V ₁ )
When the number exceeds the limit, a signal is output to the carriage control unit 20, respectively.

Here, the above-mentioned adjustment level (V ₀ ) is a voltage value of a level at which it is necessary to consume the surplus power when the power supplied to the transport vehicle 3 exceeds the required power of the drive unit 22 or the like. The dangerous voltage level (V ₁ ) is a voltage value serving as a safety limit, and the overvoltage level (V ₂ ) is, for example, a design limit value of the circuit voltage, that is, a voltage value causing a circuit breakdown. The threshold value in the hardware overvoltage detection unit 31 is set to a voltage value slightly higher than the overvoltage level (V ₂ ) of the CPU 32.

The gate trigger circuit section 33 outputs a command signal to the current short-circuit section 26 in response to signals from the hardware overvoltage detection section 31, the CPU 32 and an emergency stop switch 34 described later.

The current shorting section 26 is provided in the gate trigger circuit section 3
3 in response to a signal input from the power receiving device 3 to short-circuit the current source circuit of the power receiving device 21. The current short-circuit section 26 is configured to maintain the short-circuit state once a signal is input, and recovers only when the main power supply of the monorail type conveyance device is turned off, that is, releases the short-circuit state. It is configured as follows.

The discharge circuit section 29 operates in response to the input of a signal from the CPU 32, and discharges by short-circuiting a power supply line (voltage source line) described later and a common line via a resistor. It is. This discharge circuit section 2
Numeral 9 operates in response to a control signal and returns to a discharge stopped state after a predetermined discharge. In this point, the configuration is different from that of the current short circuit section 26 for maintaining a short circuit state.

In the figure, reference numeral 34 denotes an emergency switch operated by radio, for example.
When the switch 4 is turned on, a signal is output to the gate trigger circuit 33.

FIG. 4 shows a specific circuit configuration of the power receiving device 21.

As shown in FIG. 3, the pickup unit 25 includes the pickup coil 12 for receiving power,
The coil 41 includes a capacitor 41, a rectifier 42, and a choke coil 43 connected in parallel with the coil.
Is rectified by the rectifier 42.

The current short-circuit section 26 comprises a thyristor 44 interposed between the power supply line 39a and the common line 39b. The power supply line 39a is a current source line on the pickup unit side, and a voltage source line after the current / voltage conversion adjustment unit 27. The thyristor 44 is connected to the current source line 39a and the common line 3.
9b.

The gate terminal of the thyristor 44 has a gate trigger circuit 53 constituting the gate trigger circuit 33.
Is connected, and the thyristor 44 is turned on (a state in which the lines 39a and 39b are short-circuited) when a command signal output from the gate trigger circuit 53 is input to the gate terminal. Once activated, the thyristor 44 operates until the voltage of the power supply line 39a becomes 0 (V). Therefore, the main power supply of the monorail conveyor is turned off, and the line 39 is supplied until the current supply to the transmission line 4 is cut off.
a, 39b is kept short-circuited.

The current / voltage conversion adjusting section 27 comprises a field effect transistor 45 provided between the power supply line 39a and the common line 39b, and a capacitor 46 connected in parallel with the field effect transistor 45. Is connected to a voltage adjustment circuit 51 that constitutes the voltage adjustment control unit 30. The voltage adjustment circuit 51 is configured to output a gate signal corresponding to the duty ratio to the field effect transistor 45 while changing the duty ratio in accordance with the voltage value detected by the voltage detection unit 28. 21 is adjusted.

The voltage detecting section 28 includes a power supply line 39a
And voltage dividing resistors 48 and 49 which are arranged in series between the common line 39b and the common line 39b. The midpoint between these resistors is grounded via a capacitor 50 (shown in FIG. 5), and the voltage adjusting circuit 51 and the CPU 32 And the hardware overvoltage detection unit 3
1 is connected to the overvoltage detection circuit 52 which constitutes the circuit 1.

The overvoltage detection circuit 52 is provided, for example, in FIG.
As shown in FIG.
9 and connected to the gate trigger circuit 53 via a resistor 53 (hereinafter referred to as a PUT 52).
). Further, a resistor 54 and a Zener diode 55 are provided in series between the power supply line 39a and the common line 39b, and the resistor 54 and the Zener diode 55 are connected to the common line 39b via a capacitor 56. And the above PUT 52
It is configured to be connected to The program voltage of the PUT 57 is set so that the PUT 52 is turned on when the voltage exceeds the voltage corresponding to the threshold value.

That is, the voltage divided by the resistors 48 and 49 becomes PU
When the program voltage of T52 is exceeded, the PUT 52 is turned on and the current stored in the capacitor 56 is reduced.
And the input to the gate trigger circuit 53 via a resistor 53.

Although not shown in detail, the discharge circuit section 29 is configured to discharge in response to a signal input from the CPU 32 as described above.

Next, an example of control of the monorail type transport device configured as described above will be described with reference to the flowchart of FIG.

In this control, first, it is determined whether or not the CPU 32 is abnormal. If there is no abnormality, it is determined whether or not the main switch is turned on (steps S1 and S1).
2). If it is determined in step S1 that there is an abnormality or if it is determined in step S2 that the main switch is off, the process proceeds to step S14.

If the main switch is on, then it is determined whether the circuit voltage of the power receiving device 21 has exceeded the soft overvoltage level (V ₂ ), and if it has, the process proceeds to step S14. If not, the process proceeds to step S4 (step S3).

In step S4, it is determined whether or not the circuit voltage of the power receiving device 21 has reached the dangerous voltage level (V ₁ ). Here, when the dangerous voltage level (V ₁ ) has been reached, an abnormal signal is output to the carriage control unit 21 to stop the driving unit 22 and, for example, an LED
Is turned on to notify the operator (steps S6, S
7).

If NO in step S4, step S5
Then, it is determined whether or not the circuit voltage of the power receiving device 21 has exceeded the adjustment level (V ₀ ). If not, the process returns to step S1. On the other hand, if it exceeds the adjustment level (V ₀ ), processing for discharging is performed.

That is, in step S8, the CPU 3
2 outputs a command signal based on a duty signal to the discharge circuit unit 29. Then, it is determined whether or not the duty signal is in the ON period. If the duty signal is ON, it is determined whether or not the discharge is completed based on whether or not the voltage value has become lower than the threshold value. If it is lower than ₀ ), the output of the command signal is stopped, and the process returns to step S1 (steps S9, S12, S13).

On the other hand, if the duty signal is in the OFF period in step S8, the output of the command signal is stopped, and it is determined whether the duty signal exceeds a preset number of cycles. In this case, the process returns to step S8, and when the voltage exceeds the value (when the voltage does not decrease even if the discharge processing is repeated for the set number of cycles or more).
To step S14 (steps S9 to S1).
1).

In step S14, a signal is output from the CPU 32 to the gate trigger circuit section 33, thereby activating the current short-circuit section 26 to cause discharge, and, for example, turning on an LED to notify the operator. Thereby, this flowchart ends.

According to the above-described monorail type transport device, when the circuit voltage of the power receiving device 21 exceeds the overvoltage level (V ₂ ), the current short-circuit portion 26 incorporated in the power receiving device 21 operates as described above. Specifically, when the thyristor 44 operates, the lines 39a and 39b of the current source portion are short-circuited. In addition, this short-circuit state is maintained until the main power supply of the monorail type transfer device is turned off. Therefore, even in the case where disconnection of the circuit of the power receiving device 21 or open failure of the element or the like occurs, the voltage in the circuit is reliably prevented from being abnormally high due to the continuation of the short circuit state as described above.
Therefore, it is possible to effectively prevent the occurrence of a situation in which the circuit voltage is abnormally increased and the circuit is destroyed as in this type of conventional device.

In particular, in the above-described apparatus, in addition to performing the above-described processing when an overvoltage is detected by the CPU 32, a hardware overvoltage detection section 31 and an emergency stop switch 34 are provided. Since the command signal is output from the circuit section 33 to the current short-circuit section 26, there is also a feature that the destruction of the circuit can be more reliably prevented.

That is, if the current short-circuit section 26 is operated only by the signal output from the CPU 32,
For example, when the CPU 32 runs away, the current short circuit 26
May not operate properly. However, since the hardware overvoltage detection unit 31 is provided as described above, even if the CPU 32 goes out of control, the hardware overvoltage detection unit 31 outputs the gate trigger circuit. When a signal is output to the unit 33, the current short-circuit unit 26 operates. Also,
The current short-circuit section 26 can also be operated by operating the emergency stop switch 34 as determined by the operator. Therefore, it is possible to reliably operate the current short-circuit unit 26 and prevent a rise in voltage.

Note that FIGS. 3 and 5 described in the above embodiment
Is an example of a circuit applied to the power supply device according to the present invention, and the specific configuration can be appropriately changed without departing from the gist of the present invention.

For example, in the power receiving device 21, the thyristor 44 is applied as a specific configuration of the current shorting section 26, but the current shorting section 26 may be configured by a latching relay circuit or the like. However, once activated, the latching relay circuit cannot return on its own, that is, it cannot release the discharge state, and it is necessary to drive the relay using an external power supply in order to return. On the other hand, the thyristor 44 is advantageous in this point because the main power supply of the monorail type transfer device can be turned off, and the voltage of the power supply line 39a can be reset to 0 (V) by itself.

In the power receiving device 21, the rectifier 42
The current short-circuiting section 26 is interposed between the current / voltage conversion adjusting section 27 and the current / voltage conversion adjusting section 27. It may be between the detection unit 28 and the discharge circuit unit 29. However, it is advantageous to provide the current short-circuit portion 26 at a position close to the pickup unit portion 25 because many portions of the power receiving device 21 can be protected.

[0054]

As described above, the present invention relates to a non-contact type power supply device provided with a power receiving device for generating an induced electromotive force in accordance with a constant high-frequency current in a moving body moving in a track. Detecting means for detecting the voltage value of the detecting means, comparing means for outputting a signal when the voltage value detected by the detecting means exceeds a predetermined threshold value, and short-circuiting the circuit according to the signal from the comparing means. A short-circuit means for self-holding the short-circuit state is provided, and in the event of a disconnection or the like in the circuit, the short-circuit state is maintained to suppress an increase in the circuit voltage. Then, it is possible to more reliably prevent circuit destruction caused by an abnormal rise in circuit voltage.

In particular, the power receiving device includes a pickup unit having a power receiving coil, a rectifying unit connected to the coil,
In the case of having a power conversion adjustment unit connected to the rectification unit and adjusting the voltage, if the short-circuit means is provided between the rectification unit and the power conversion adjustment unit, Many parts of the output side circuit can be protected.

Further, if each comparing means of software and hardware is provided, the short-circuit means operates according to a signal output from one of the comparing means unless all the comparing means are damaged. Thus, the short-circuit means can be operated more reliably.

Further, if the short-circuit means is constituted by a thyristor for short-circuiting the current source circuit in accordance with the input of the signal from the comparison means, the short-circuit means can be obtained with a simple circuit configuration.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a monorail type transfer device to which a non-contact power supply device according to the present invention is applied.

FIG. 2 is a cross-sectional view of a main part of the monorail transfer device.

FIG. 3 is a block diagram showing a control system mounted on a transport cart of the monorail transport device.

FIG. 4 is a circuit diagram showing a specific configuration (main part) of a control system mounted on a transport trolley of the monorail transport device.

FIG. 5 is a circuit diagram illustrating an example of a specific configuration of a voltage detection unit and a discharge circuit unit.

FIG. 6 is a flowchart illustrating an example of control of the monorail transport device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Monorail 2 Conveying trolley 20 Cart control part 21 Power receiving device 22 Drive part 25 Pickup unit part 26 Current short circuit part 27 Current / voltage conversion adjustment part 28 Voltage detection part 29 Discharge circuit part 30 Voltage adjustment control part 31 Hardware overvoltage detection part 32 CPU 33 gate trigger circuit

Claims (4)

[Claims] 1. A power receiving device for arranging a transmission line through which a constant high-frequency current flows along a track, and causing a moving body moving on the track to generate an induced electromotive force by the high-frequency current; In a mobile non-contact power supply device having a load connected to an output side, a detection unit for detecting a circuit voltage in the power receiving device, and a detection voltage value detected by the detection unit exceeds a predetermined threshold value A non-contact moving object, comprising: a comparing means for outputting a signal to the moving body; and a short-circuit means for short-circuiting the circuit in accordance with the input of the output signal from the comparing means and for self-holding the short-circuit state. Power supply. 2. The power receiving device includes a pickup unit having a coil for receiving power, a rectifying unit connected to the coil, and a power conversion adjusting unit connected to the rectifying unit and adjusting the voltage to a predetermined voltage. The non-contact power supply device for a moving body according to claim 1, wherein the short-circuit means is interposed between the rectifying unit and the power conversion adjusting unit. And a hardware comparing means comprising an electric circuit whose energization state changes when an input voltage corresponding to a detected voltage value exceeds a predetermined level. The non-contact power supply device for a moving body according to claim 1 or 2, further comprising: 4. The non-moving body according to claim 1, wherein said short-circuit means comprises a thyristor for short-circuiting a current source circuit in response to a signal input from said comparing means. Contact type power supply.