JP2009298566A - Control device of transfer device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control device of a transfer device having a detection device of which the size is decreased by reducing electric power consumed by a device for detecting the operation state of a switch element and reducing heat leakage. <P>SOLUTION: The control device of the transfer device is provided with the switch element 2a connected with one of terminals of a power source 1, a serial connection body connected with the switch element 2 composed of current limit resistances 4a, 5a and an LED 6a of a photocoupler to which a voltage is supplied from the power source 1 by the conduction of the switch element 2a, a transistor 10a of the photocoupler for conducting in accordance with the electric current through the LED 6a of the photocoupler and a voltage control device 14 connected between the other terminal of the power source 1 and the serial connection body for controlling the intermittent application of the voltage supplied to the serial connection body. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a control device for a transfer device, and more particularly to a control device for a transfer device that controls a transfer device such as an elevator or an escalator.

  In general, elevators, escalators, and man-made conveyors such as moving walkways detect the operating state of each device to ensure safety. Provided. For example, in the case of an elevator, various operation states such as an elevator car position state, a brake operation state, and a door operation state are detected.

  By the way, as a failure detection device for man conveyors, a safety switch element can be used to check whether any of a number of safety switch elements have failed such as poor contact, broken wiring, or poor connection contact. An apparatus has been proposed in which the operation state is detected by a photocoupler and the signal is taken into a microcomputer for determination (see, for example, Patent Document 1).

JP 2005-89072 A (summary column, FIG. 1)

  However, in the technique disclosed in Patent Document 1, current is always supplied to the LED of the photocoupler at the normal time when the failure of the safety switch element is not confirmed. Therefore, for example, when the voltage of the power source connected to one end of the safety switch element to be detected is 125 V and the current to be passed between the contacts of the safety switch element is about 10 mA, the safety switch element The primary side of the device that detects the operating state consumes 1.25 W of power. Therefore, when many devices of the same type are arranged, a large amount of power is consumed by the detection device of the operating state of the safety switch element, and the detection device is used to dissipate the heat generated based on the power consumption. There is a problem that the size must be increased.

  The present invention has been made to solve the above-described problems, and reduces the power consumed by the device for detecting the operating state of the switch element and reduces the heat dissipation, thereby reducing the size of the detection device. A control device for the apparatus is provided.

  The control device of the transfer device according to the present invention includes a switch element connected to one terminal of a power supply, a current limiting resistor connected to the switch element, and supplied with a voltage from the power supply by conduction of the switch element, and a photo Connected between the series connection body of the LED of the coupler, the transistor of the photocoupler that conducts according to the current flowing through the LED of the photocoupler, the other terminal of the power source and the series connection body, and the series connection body. And a voltage control device that intermittently controls the voltage supplied to the connection body.

  According to the control device of the transfer device according to the present invention, it is possible to reduce the power consumed to detect the operation state of the switch element, to reduce heat dissipation, and to reduce the size of the detection device. .

  Preferred embodiments of a control device for a transfer device according to the present invention will be described below with reference to the accompanying drawings. In the following embodiments, an elevator control device will be described as an example, but the present invention is not limited to this.

Embodiment 1 FIG.
FIG. 1 is a diagram illustrating an elevator control apparatus according to Embodiment 1 of the present invention. In the description, first, the configuration of the car position state detection device will be described.
In FIG. 1, one end of a switch element (hereinafter referred to as a first safety switch) 2a for detecting the elevator car position state is connected to the anode of the power source 1, and the other end of the first safety switch 2a is connected to the anode. A detection circuit (hereinafter referred to as a first detection circuit) 3a for detecting the operating state of the first safety switch 2a is connected.

  The primary side of the first detection circuit 3a includes a first current limiting resistor 4a connected to the first safety switch 2a, and a second current limiting resistor 5a connected in series with the first current limiting resistor 4a. A first photocoupler LED (hereinafter referred to as a first LED) 6a having one end connected to the second current limiting resistor 5a and the other end connected to a drain terminal of a MOSFET 19 to be described later. . The first LED 6 a has an anode connected to the second current limiting resistor 5 a and a cathode connected to the drain terminal of the MOSFET 19.

  Further, the primary side of the first detection circuit 3a is connected in parallel to the first LED 6a, and a first diode 7a for preventing a reverse voltage from being applied to the first LED 6a, and a first diode 7a A first dark current prevention resistor 8a that is connected in parallel and prevents the first LED 6a from being lit by dark current, and one end connected to a connection point between the first current limiting resistor 4a and the second current limiting resistor 5a. And a first capacitor 9 a having the other end connected to the drain terminal of the MOSFET 19. The first capacitor 9a forms a low-pass filter that exhibits a noise reduction effect by a combination of the first current limiting resistor 4a and the second current limiting resistor 5a.

  The secondary side of the first detection circuit 3a is a first photocoupler transistor (hereinafter referred to as a first phototransistor) 10a that is turned on and off in response to light from the first LED 6a, and a power source. And a first pull-up resistor 11a having one end connected to Vcc and the other end connected to the collector of the first phototransistor 10a. The emitter terminal of the first phototransistor 10a is connected to the ground side (negative electrode side) of the power supply Vcc, and the collector terminal is connected to the first signal line 13a for transmitting a signal to the control device 12 including the CPU. ing.

  As described above, the elevator car position state detection device is constituted by the first safety switch 2a and the first detection circuit 3a.

Next, the configuration of the operating state detection device for the brake drive device will be described.
One end of a switch element (hereinafter referred to as a second safety switch) 2b for detecting the operation state of the elevator brake drive device is connected to the anode of the power source 1, and the other end of the second safety switch 2b. Further, a detection circuit (hereinafter referred to as a second detection circuit) 3b for detecting the operating state of the second safety switch 2b is connected. The second safety switch 2b and the second detection circuit 3b constitute an operation state detection device for an elevator brake drive device.

The primary side and secondary side of the second detection circuit 3b are configured in the same manner as the primary side and secondary side of the first detection circuit 3a.
That is, the primary side of the second detection circuit 3b includes a third current limiting resistor 4b connected to the second safety switch 2b and a fourth current limiting resistor connected in series with the third current limiting resistor 4b. 5b and a second photocoupler LED (hereinafter referred to as a second LED) 6b having one end connected to the fourth current limiting resistor 5b and the other end connected to the drain terminal of the MOSFET 19. . The second LED 6 b has an anode connected to the fourth current limiting resistor 5 b and a cathode connected to the drain terminal of the MOSFET 19.

  Further, the primary side of the second detection circuit 3b is connected in parallel to the second LED 6b, and a second diode 7b for preventing a reverse voltage from being applied to the second LED 6b, and a second diode 7b A second dark current prevention resistor 8b which is connected in parallel and prevents the second LED diode 6b from being lit by dark current, and one end of the third current limiting resistor 4b and the fourth current limiting resistor 5b. And a second capacitor 9b connected to the connection point and having the other end connected to the drain terminal of the MOSFET 19. The second capacitor 9b forms a low-pass filter that exhibits a noise reduction effect by a combination of the third current limiting resistor 4b and the fourth current limiting resistor 5b.

  The secondary side of the second detection circuit 3b is a second photocoupler transistor (hereinafter referred to as a second phototransistor) 10b that is turned on and off in response to the light from the second LED 6b, and a power source. And a second pull-up resistor 11b having one end connected to Vcc and the other end connected to the collector of the second phototransistor 10b. The emitter terminal of the second phototransistor 10b is connected to the ground side (negative electrode side) of the power source Vcc, and the second signal line 13b for transmitting a signal to the control device 12 is connected to the collector terminal.

  As described above, the second safety switch 2b and the second detection circuit 3b constitute an operation state detection device for an elevator brake drive device.

Next, the configuration of the elevator door operation state detection device will be described.
One end of a switch element (hereinafter referred to as a third safety switch) 2c for detecting the operation state of the elevator door is connected to the anode of the power source 1, and a third terminal is connected to the other end of the third safety switch 2c. A detection circuit (hereinafter referred to as a third detection circuit) 3c for detecting the operating state of the safety switch 2c is connected. The third safety switch 2c and the third detection circuit 3c constitute an elevator door operation state detection device.

The primary side and secondary side of the third detection circuit 3c are configured in the same manner as the primary side and secondary side of the first detection circuit 3a.
That is, the primary side of the third detection circuit 3c includes a fifth current limiting resistor 4c connected to the third safety switch 2c and a sixth current limiting resistor connected in series with the fifth current limiting resistor 4c. 5c, and a third photocoupler LED (hereinafter referred to as a third LED) 6c having one end connected to the sixth current limiting resistor 5c and the other end connected to the drain terminal of the MOSFET 19. . The third LED 6 c has an anode connected to the sixth current limiting resistor 5 c and a cathode connected to the drain terminal of the MOSFET 19.

  Further, the primary side of the third detection circuit 3c is connected in parallel to the third LED 6c, and a third diode 7c for preventing a reverse voltage from being applied to the third LED 6c, and a third diode 7c. A third dark current prevention resistor 8c that is connected in parallel and prevents the third LED 6c from being lit by dark current, and one end connected to the connection point of the fifth current limiting resistor 4c and the sixth current limiting resistor 5c. And a third capacitor 9c having the other end connected to the drain terminal of the MOSFET 19. The third capacitor 9c forms a low-pass filter that exhibits a noise reduction effect by a combination of the fifth current limiting resistor 4c and the sixth current limiting resistor 5c.

  The secondary side of the third detection circuit 3c is a third photocoupler transistor (hereinafter referred to as a third phototransistor) 10c that is turned on and off in response to light from the third LED 6c, and a power source. And a pull-up resistor 11c having one end connected to Vcc and the other end connected to the collector of the third phototransistor 10c. The emitter terminal of the third phototransistor 10c is connected to the ground side (negative electrode side) of the power supply Vcc, and the third signal line 13c for transmitting a signal to the control device 12 is connected to the collector terminal.

  As described above, the third safety switch 2c and the third detection circuit 3c constitute an elevator door operation state detection device.

  The elevator car position state detection device, the brake drive device operation state detection device, and the door operation state detection device are configured as described above. Next, voltage control is performed to control voltage supply to each of the detection devices. The configuration of the apparatus will be described.

  In FIG. 1, the code | symbol 14 has shown the voltage control apparatus. The voltage control device 14 is an LED of a detection circuit driving photocoupler (hereinafter referred to as a fourth LED) that is turned on when the power supply signal output from the control device 12 to the power supply signal line 15 becomes L level. 16, a fourth current transistor connected to the fourth LED 16, a seventh current limiting resistor 17 for limiting the current from the power supply Vcc to the fourth LED 16, and a fourth phototransistor that operates ON and OFF according to the light emission of the fourth LED 16. 18 and a switch for controlling power feeding to each of the detection circuits of the first detection circuit 3a, the second detection circuit 3b, and the third detection circuit 3c, for example, the MOSFET 19 and the fourth phototransistor 18 are turned off. And a pull-down resistor 20 for setting the voltage applied between the control terminals of the MOSFET 19 to L level. The power supply signal output from the control device 12 to the power supply signal line 15 is output from the control device 12 to the first detection circuit 3a, the second detection circuit 3b, or the third detection circuit 3c. Power supply signal.

  As described above, the voltage control device 14 is configured. In the above configuration, the voltage control device 14 is used as a switch for controlling power supply to the first detection circuit 3a, the second detection circuit 3b, or the third detection circuit 3c. Alternatively, the MOSFET 19 may be a bipolar transistor or a relay as long as it is a switch that can be turned on and off.

  The elevator control apparatus according to Embodiment 1 of the present invention is configured as described above, and the operation thereof will be described next. First, the operation of the car position state detection device will be described.

  In FIG. 1, an operation when an L level power supply signal is output from the control device 12 to the power supply signal line 15 will be described.

  When an L level power supply signal is output to the power supply signal line 15, the cathode potential of the fourth LED 16 is equivalent to the negative potential of the power supply Vcc, and is configured by the fourth LED 16 and the seventh current limiting resistor 17. A voltage is applied to the series circuit, and the fourth LED 16 emits light. The fourth phototransistor 18 that has received the light from the fourth LED 16 is turned on, the power supply voltage of the power supply Vcc2 is applied between the pull-down resistor 20 and the gate and source of the MOSFET 19, and the MOSFET 19 is also turned on.

  In this case, when the contact of the first safety switch 2a is turned on, the voltage of the power source 1 is changed to the series of the first current limiting resistor 4a, the second current limiting resistor 5a, and the first dark current preventing resistor 8a. The voltage is applied to the circuit and the first LED 6a and the first diode 7a connected in parallel to the first dark current prevention resistor 8a. When the voltage is applied to the first LED 6a, the first LED 6a is turned on, and accordingly, the first phototransistor 10a is turned on, and the first signal line 13a sends an L level signal to the control device 12. Is transmitted.

  On the contrary, when the contact of the first safety switch 2a is interrupted, the series circuit of the first current limiting resistor 4a, the second current limiting resistor 5a, and the first dark current preventing resistor 8a, The voltage applied to the first LED 6a and the first diode 7a connected in parallel to the dark current prevention resistor 8a is cut off. When the voltage application to the first LED 6a is cut off, the first phototransistor 10a is turned off, and the collector voltage of the phototransistor 10a, that is, the signal from the first signal line 13a is supplied to the power supply Vcc by the pull-up resistor 11a. Is transmitted to the control device 12 as an H level signal.

  When the signal from the first signal line 13a is an L level signal, the control device 12 turns on the first safety switch 2a, and the signal from the first signal line 13a is an H level signal. If there is, it is determined that the first safety switch 2a is in an OFF operation, and the operating state of the first safety switch 2a is detected. Thereby, the operating state of the first safety switch 2a can be detected.

  Next, with regard to the operation of the operation state detection device of the brake drive device, when the contact of the second safety switch 2b is turned on, the second phototransistor 10b is turned on in the same operation as when the car position state is detected. Then, an L level signal is transmitted to the control device 12 through the second signal line 13b. Further, when the contact of the second safety switch 2b is cut off, the second phototransistor 10b shifts to the OFF operation in the same operation as the case of detecting the car position state, and the second signal line 13b is used for the control device 12. An H level signal is transmitted.

  If the signal on the second signal line 13b is an L level signal, the control device 12 turns on the second safety switch 2b, and if the signal on the second signal line 13b is an H level signal. Then, it is determined that the second safety switch 2b is in the OFF operation, and the operating state of the second safety switch 2b is detected. Thereby, the operating state of the second safety switch 2b can be detected.

  Further, regarding the operation of the elevator door operation state detection device, when the contact of the third safety switch 2c is turned on, the third phototransistor 10c shifts to the ON operation in the same operation as when the car position state is detected. The L level signal is transmitted to the control device 12 through the third signal line 13c. Further, when the contact of the third safety switch 2c is cut off, the third phototransistor 10c shifts to an OFF operation, and an H level signal is transmitted to the control device 12.

  If the signal from the third signal line 13c is an L level signal, the control device 12 turns on the third safety switch 2c, and the signal from the third signal line 13c is an H level signal. If there is, it is determined that the third safety switch 2c is in an OFF operation, and the operating state of the third safety switch 2c is detected. Thereby, the operating state of the third safety switch 2c can be detected.

  As described above, when the control device 12 supplies the L level signal to the power supply signal line 15, the control device 12 detects the operation state of the car position state detection device based on the signal from the first signal line 13a, and The operation state of the operation state detection device of the brake drive device is detected by a signal from the second signal line 13b, and the operation state of the operation state detection device of the elevator door is detected by a signal from the third signal line 13c.

  Next, the operation when the H level power supply signal is output from the control device 12 to the power supply signal line 15 will be described.

  The output of the H level power supply signal from the power supply signal line 15 means that a voltage equivalent to the power supply Vcc is output, and no voltage is applied between the terminals of the fourth LED 16. . In this state, the fourth LED 16 does not emit light, and the fourth phototransistor 18 is also turned off. In this state, the pull-down resistor 20 causes the gate-source voltage of the MOSFET 19 to become almost zero, and the MOSFET 19 is turned off.

  The MOSFET 19 forms a series circuit with the power source 1, and when it is turned off, the first detection is performed regardless of the operating state of the first safety switch 2a, the second safety switch 2b, or the third safety switch 2c. The voltage of the power source 1 is not supplied to the primary side of the circuit 3a, the second detection circuit 3b, or the third detection circuit 3c. Therefore, no current flows to the primary side of the first detection circuit 3a, the second detection circuit 3b, or the third detection circuit 3c, and during this time, the first detection circuit 3a, the second detection circuit 3b, The power consumption in the third detection circuit 3c is almost zero.

  As described so far, when the control device 12 outputs an L level signal to the power supply signal line 15, the control device 12 can detect the state of the safety switches 2a to 2c. During this time, the first detection circuit Power is consumed on the primary side of 3a to 3rd detection circuit 3c, but when an H level signal is output to power supply signal line 15, the primary of 1st detection circuit 3a to 3rd detection circuit 3c The power consumed on the side can be made zero. In other words, only when it is necessary to detect the state of the safety switch, the L level signal is supplied to the power supply signal line 15 and the H level signal is supplied during the other periods, whereby the first detection circuit 3a to the third detection circuit 3a. The average power consumption of the detection circuit 3c can be greatly reduced.

  As described above, according to the elevator control device according to the first embodiment, the operation state of the car position state detection device, the operation state of the brake drive device operation state detection device, or the operation of the elevator door operation state detection device. The power consumed to detect the state can be reduced, heat dissipation can be reduced, and the area of the circuit board can be reduced at the same time, thereby reducing the size of the detection device.

Embodiment 2. FIG.
Next, an elevator control apparatus according to Embodiment 2 will be described. FIG. 2 is a diagram for explaining an elevator control apparatus according to Embodiment 2 of the present invention. The same parts as those in Embodiment 1 are denoted by the same reference numerals and description thereof is omitted.

  In the elevator control apparatus according to the first embodiment, power consumption on the primary side of the first detection circuit 3a, the second detection circuit 3b, or the third detection circuit 3c can be significantly reduced, and a circuit board can be used. Can be reduced at the same time, and the apparatus can be miniaturized.

  However, by downsizing the primary side of the first detection circuit 3a, the second detection circuit 3b, or the third detection circuit 3c in accordance with the average power consumption, processing abnormality of the control device occurs, and the MOSFET 19 When the ON state is longer than expected, the temperature of components constituting the primary side of the first detection circuit 3a, the second detection circuit 3b, or the third detection circuit 3c rises more than expected, There is a possibility of inducing a failure of the detection circuit.

  Therefore, in the second embodiment, as shown in FIG. 2, in addition to the first capacitor 9a for noise reduction, the first low frequency current removing means, for example, the first low frequency removing capacitor 21a is used for noise reduction. In addition to the second capacitor 9b, the second low-frequency current removing means, for example, the second low-frequency removing capacitor 21b is added, and the third low-frequency current removing is added to the third capacitor 9c for noise reduction. Means, for example, by providing the third low-frequency rejection capacitor 21c, even if a long-time voltage is applied to the primary side of the first detection circuit 3a, the second detection circuit 3b, or the third detection circuit 3c, This prevents the average power consumption from being excessively applied.

  Further, the MOSFET 19 is turned on, and the first safety switch 2a, the second safety switch 2b, or the contact of the third safety switch 2c is accumulated in the low frequency elimination capacitors 21a, 21b, and 21c of the circuit. Capacitor discharge resistors 22a, 22b, and 22c are provided for discharging the generated charges and returning the detection circuit to the initial state.

  As described above, according to the elevator control device of the second embodiment, in addition to the effects of the first embodiment, the first detection circuit 3a, the second detection circuit 3b, or the third detection circuit 3c. By providing the first low-frequency rejection capacitor 21a, the second low-frequency rejection capacitor 21b, and the third low-frequency rejection capacitor 21c on the primary side, even if a processing abnormality of the control device 12 occurs, the first The detection circuit 3a, the second detection circuit 3b, or the third detection circuit 3c has an effect of preventing the average power consumption from being excessively increased.

  In the above-described embodiment, the MOSFET 19 that controls power feeding to the detection circuits of the first detection circuit 3a, the second detection circuit 3b, and the third detection circuit 3c and the drive circuit thereof are only one circuit. Alternatively, the power consumption may be minimized by providing a plurality and performing state detection at different periods.

  In the above-described embodiment, the contact of the first safety switch 2a, the second safety switch 2b, or the third safety switch 2c to be detected is one circuit for each primary side. Alternatively, it may be constituted by a series or parallel circuit of a plurality of contacts.

  In the above-described embodiment, the control device 12 is a CPU. However, it prevents the detection circuit primary side from being supplied with power exceeding the average power consumption assumed by the hardware due to software runaway. Therefore, a circuit that prevents a drive signal from being applied with a hardware logic over a certain period of time or a drive signal with a frequency exceeding a certain period is provided in the middle of the power supply signal line 15 that outputs a power supply signal from the control device 12. May be interrupted.

  Furthermore, in the above embodiment, the elevator control device is taken as an example, the operation state of the car position state detection device, the operation state of the brake drive device operation state detection device, or the operation state of the elevator door operation state detection device. Although the case of three detection circuits for detecting the state has been described, it is needless to say that the present invention can also be applied to an operation state detection device for other control devices in an elevator.

  Furthermore, in the above embodiment, an elevator control device has been described as an example, but it can also be applied to an operation state detection device of a control device in a man conveyor such as an escalator or a moving walkway, and in an industrial plant. The present invention can be applied in many fields such as an operating state detection device for an electric valve used for controlling fluid transfer such as water and air.

  The control device for the transfer device according to the present invention can be used as a control device for elevators, man conveyors such as escalators or moving walkways, and fluid transfer devices in industrial plants.

It is a figure explaining the control apparatus of the elevator which concerns on Embodiment 1 of this invention. It is a figure explaining the control apparatus of the elevator which concerns on Embodiment 2 of this invention.

Explanation of symbols

1: Power supply 2a, 2b, 2c: Safety switch 3a, 3b, 3c: Detection circuit 4a, 4b, 4c, 5a, 5b, 5c, 17: Current limiting resistor 6a, 6b, 6c, 16: LED
7a, 7b, 7c: Reverse voltage application preventing diodes 8a, 8b, 8c: Dark current countermeasure resistors 9a, 9b, 9c: Noise reducing capacitors 10a, 10b, 10c, 18: Phototransistors 11a, 11b, 11c: Pull Up resistor 12: Control devices 13a, 13b, 13c: Signal line 14: Voltage control device 15: Power supply signal line 19: MOSFET
20: Pull-down resistor 21: Low frequency rejection capacitor 22: Capacitor discharge resistance

Claims (2)

A switch element connected to one terminal of the power source;
A series connection body of a current limiting resistor connected to the switch element and supplied with a voltage from the power source by conduction of the switch element and an LED of a photocoupler;
A transistor of the photocoupler that conducts according to a current flowing through the LED of the photocoupler;
A voltage control device that is connected between the other terminal of the power source and the series connection body and intermittently controls the voltage supplied to the series connection body;
The control apparatus of the transfer apparatus characterized by the above-mentioned.   2. The control device for a transfer device according to claim 1, wherein a low-frequency current removing means is connected to a series connection body of the current limiting resistor and the photocoupler LED.

Images