JP5732917B2 - Elevator signal transmission device - Google Patents

Description

  The present invention relates to an elevator signal transmission apparatus.

  In recent years, highly functional elevators are desired. Therefore, a high-performance and inexpensive microprocessor is used for the elevator signal transmission device. Specifically, the elevator control panel is provided with a master station microcomputer. A slave station microcomputer is provided at the hall and car on each floor. Electric power is supplied to these microcomputers from a power supply device.

  The master station microcomputer and the slave station microcomputer transmit and receive various signals via a signal transmission line. At this time, the reception signal of each microcomputer is divided using the voltage supplied from the power supply device. As a result, the received signal has a voltage value that can be normally determined by the microcomputer (see, for example, Patent Document 1).

Japanese Patent No. 2509359

  However, when the output voltage of the power supply device decreases, the value of the voltage of the received signal changes. For this reason, for example, the microcomputer may erroneously determine a HIGH level signal as a LOW level signal.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to transmit an elevator signal that can correctly transmit a signal even when the output voltage of the power supply device is low. Is to provide a device.

An elevator signal transmission device according to the present invention includes a master station provided in an elevator control panel, a slave station provided in a hall or a car of the elevator, and one of the master station and the slave station via an electric wire. a power supply for supplying power Te, the host station and by using the voltage supplied through the wire from the power supply device in proximate one of said slave stations, the other of said master station and said slave station A voltage dividing means for dividing a voltage of a signal transmitted to one side in the vicinity of one of the master station and the slave station; and a voltage supplied from the power supply device to the voltage dividing means. A monitoring unit that monitors the wire near one of the master station and the slave station, and a voltage value when the voltage of the signal is divided based on the voltage value monitored by the monitoring unit is the parent value. Within the range where one of the station and the slave station can be judged normally And control means for controlling the partial pressure means so that is those with.

  According to the present invention, a signal can be correctly transmitted even when the output voltage of the power supply device is low.

1 is a block diagram of an elevator signal transmission apparatus according to Embodiment 1 of the present invention. FIG. 2 is a detailed view of part A in FIG. 1. It is a figure which shows the circuit model of the electric power supply of the signal transmission apparatus of the elevator in Embodiment 1 of this invention. It is a figure which shows the structure of the circuit of the hall operating panel in which the signal transmission apparatus of the elevator in Embodiment 1 of this invention is utilized. FIG. 5 is a block diagram of the power supply monitoring circuit of FIG. 4.

  A mode for carrying out the invention will be described with reference to the accompanying drawings. In addition, in each figure, the same code | symbol is attached | subjected to the part which is the same or it corresponds, The duplication description is simplified or abbreviate | omitted suitably.

Embodiment 1 FIG.
1 is a block diagram of an elevator signal transmission apparatus according to Embodiment 1 of the present invention.

  In FIG. 1, 1 is an elevator control panel. The elevator control panel 1 is provided in an elevator hoistway (not shown) or a machine room (not shown). The elevator control panel 1 incorporates a master station microcomputer 2. The master station microcomputer 2 has a function of managing control of the entire elevator.

  3 is a hall operation panel. The hall operation panel 3 is provided at a hall (not shown) on each floor where an elevator is installed. Each hall operation panel 3 is provided with a digital indicator 4, a hall button 5, and a hall button light 6.

  The digital indicator 4 has a function of displaying the position and traveling direction of an elevator car (not shown). The hall button 5 has a function of registering a floor hall call corresponding to a case where it is pressed. The hall button lamp 6 has a function of turning on when a hall call corresponding to the floor is registered.

  Each hall operation panel 3 incorporates a slave station microcomputer 7. Each slave station microcomputer 7 has a function of controlling the corresponding digital indicator 4, landing button 5, and landing button light 6. Each slave station microcomputer 7 is connected to the master station microcomputer 2 via a first signal transmission line 8 and a second signal transmission line 9.

  The first signal transmission line 8 is used when each control signal is transmitted from the master station microcomputer 2 to the slave station microcomputer 7. The second signal transmission line 9 is used when each signal is transmitted from the slave station microcomputer 7 to the master station microcomputer 2.

  Reference numeral 10 denotes a DC power supply device. Each DC power supply device 10 is provided in a hoistway, for example. Each DC power supply 10 is supplied with electric power from the elevator control panel 1 via a power supply bus 11. The DC power supply device 10 on the elevator control panel 1 side supplies power to the master station microcomputer 2 through the power supply line 12 and the ground line 13. Each DC power supply 10 supplies power to the hall operation panel 3 for the third floor via the power line 12 and the ground line 13. The number of hall operating panels 3 corresponding to each DC power supply device 10 is changed as necessary.

Next, the basic configuration of the receiving circuit of the hall operating panel 3 will be described with reference to FIG.
FIG. 2 is a detailed view of part A of FIG.

  As shown in FIG. 2, a DC voltage V <b> 12 is supplied to the hall operating panel 3 through the power line 12. The DC voltage V12 is used to operate the control circuit (interface circuit) of the signal transmission circuit, the digital indicator 4, the hall button 5, and the hall button lamp 6.

  The DC voltage V12 is stepped down to a DC voltage V5 via a DC power supply regulator IC14. The DC voltage V5 is used to operate the slave station microcomputer 7 and the buffer IC around the slave station microcomputer 7.

  Various control signals from the master station microcomputer 2 are input to the hall operating panel 3 via the first signal transmission line 8. The control signal is divided by resistors R1, R2, and R3 using a DC voltage V12. That is, the resistors R1, R2, and R3 function as voltage dividing means that divides the control signal. The resistance values of the resistors R1, R2, and R3 are set so that the control signal is converted into a range in which logical determination can be normally made by the slave station microcomputer 7 and the buffer IC.

Next, power supply from the DC power supply device 10 will be described with reference to FIG.
FIG. 3 is a diagram showing a circuit model of power supply in the elevator signal transmission apparatus according to Embodiment 1 of the present invention.

  In FIG. 3, the master station microcomputer 2 is shown as a current source. The hall operating panel 3 is also shown as a current source.

The resistance values of the power supply line 12 between the hall operation panels 3 are Ra ₍₁₎ to Ra _(n-1) . The resistance values of the ground wire 13 between the hall operation panels 3 are Ra ₍₁₎ to Ra _(n-1) . The resistance value of the electric wire between each hall operating panel 3 and the power supply line 12 is Rb ₍₁₎ to Rb _(n) . The resistance value of the electric wire between each hall operating panel 3 and the ground wire 13 is defined as Rb ₍₁₎ to Rb _(n) .

  Let Rc be the resistance value of the power supply line 12 closer to the master station microcomputer 2 than the DC power supply 10. Let Rc be the resistance value of the ground line 13 closer to the master station microcomputer 2 than the DC power supply 10. The resistance value of the electric wire between the DC power supply device 10 and the power supply line 12 is Rd. The resistance value of the electric wire between the DC power supply device 10 and the ground line 13 is Rd.

Let the output voltage of the DC power supply 10 be Vo. The load current flowing through the master station microcomputer 2 is Ic. The load currents flowing through the hall operating panels 3 are defined as IH _{(1) to} IH _(n) .

  In this case, the input voltage Vin (n) at the An point on the n-th floor hall operation panel 3 is approximated by the following equation.

Vin (n) = Vo-2 * (Ra _(n-1) + Rb _(n) ) * _{IH (n)}
−2 × Ra _(n−2) × (I _{H (n)} + I _{H (n−1)} ) −.
−2 × Ra ₍₁₎ × (I _{H (n)} + I _{H (n−1)} +... + I _{H (2)} )
−2 × Rd × (I _{H (n)} + I _{H (n−1)} +... I _{H (2)} + I _{H (1)} + Ic)

That is, the larger the load current Ic of the master station microcomputer 2 and the load currents IH _{(1) to} IH _(n-1) of the hall operation panel 3 on the _{1st to (n-1)} th floor, the larger the input voltage Vin (n). Go down. The input voltage Vin (n) decreases as the resistance values Ra _{(1) to} Ra _{(n-1) and the} like of the power supply line 12 between the hall operation panels 3 increase.

  Here, the longer the electric wire such as the power supply line 12, the greater the resistance value of the electric wire. For this reason, when a voltage is supplied from the remote DC power supply 10 to the n-th floor hall operating panel 3 via the power line 12 or the like, the input voltage Vin (n) decreases.

  When the input voltage Vin (n) decreases, the voltage value of the control signal divided by the resistors R1, R2, and R3 also decreases. In this case, the slave station microcomputer 7 and the buffer IC may not normally logically determine the control signal. In this case, a transmission error occurs.

  In order to prevent this transmission abnormality, a method of correctly supplying the DC voltage V12 by the DC power supply device 10 can be considered. For example, a DC power supply 10 is provided for each floor, or a DC power supply 10 is provided for each floor so that a voltage drop due to connection wiring between the DC power supply 10 and a control device such as a hall operating panel 3 is within an allowable range. 10 may be provided.

  However, in these methods, it is necessary to increase the number of DC power supply devices 10 as the number of elevator stops increases. For this reason, a signal transmission apparatus becomes expensive.

  Therefore, in the present embodiment, even when the output voltage of the DC power supply device 10 is not stable or when power is supplied from the DC power supply device 10 at a remote location, the control signal or the like is normally output. It was configured to transmit. As a result, the signal transmission device becomes inexpensive. Hereinafter, the signal transmission apparatus according to the present embodiment will be described in detail.

First, the circuit of the hall operating panel 3 unique to the present embodiment will be described with reference to FIG.
FIG. 4 is a diagram showing a circuit configuration of a hall operating panel in which the elevator signal transmission apparatus according to Embodiment 1 of the present invention is used.

  In FIG. 4, the resistor R2a and the FET element 15 are connected in parallel between the resistor R2 and the ground line 13. The control terminal of the FET element 15 is connected to the output terminal Out of the slave station microcomputer 7.

  An input terminal of a power supply monitoring circuit 16 is connected to the power supply line 12. The output terminal of the power monitoring circuit 16 is connected to the input terminal In of the slave station microcomputer 7.

  The power supply monitoring circuit 16 monitors the voltage value of the DC voltage V12 in the vicinity of the slave station microcomputer 7 as monitoring means. The power supply monitoring circuit 16 converts the monitored voltage value into a digital value and transmits it to the input terminal In of the slave station microcomputer 7. At this time, the slave station microcomputer 7 functions as a control unit that controls the operation of the FET element 15 based on the voltage value input from the power supply monitoring circuit 16.

  Specifically, when the voltage value input from the power supply monitoring circuit 16 is larger than a predetermined determination value, the slave station microcomputer 7 turns on the FET element 15. In this case, the control signal from the master station microcomputer 2 is divided by the resistors R3, R1, and R2, as in the circuit of FIG. This voltage division determines the voltage level of the signal input to the slave station microcomputer 7.

  When the voltage value input from the power supply monitoring circuit 16 is smaller than a predetermined determination value, the slave station microcomputer 7 turns off the FET element 15. In this case, the control signal from the master station microcomputer 2 is divided by the resistors R3, R1, R2, and R2a. As a result, the voltage level of the signal input to the slave station microcomputer 7 is determined.

  Therefore, if the value of the resistor R2a is appropriately selected for R3, R2, and R1, the control signal from the master station microcomputer 2 is transmitted by the slave station microcomputer 7 regardless of the voltage value of the DC voltage V12. The voltage level can be determined normally.

  Similar control is performed in other circuits using the DC voltage V12. As a result, each circuit operates normally even when the DC voltage V12 decreases. As an example, lighting of the hall button lamp 6 will be described.

  The hall button lamp 6 in FIG. 4 is formed of a light emitting diode. When the output terminal Lout of the slave station microcomputer 7 is turned on, the hall button lamp 6 is turned on. The DC voltage V12 is used for this lighting.

  The landing button lamp 6 is lit even when a pulse signal is output from the output terminal Lout of the slave station microcomputer 7. The resistance value that determines the forward current flowing through the landing button lamp 6, the output period of the pulse signal from the slave microcomputer 7, and the width of the pulse signal are the brightness of the landing button lamp 6 when the DC voltage V12 is not low. Is determined to be optimal.

  When the DC voltage V12 becomes low, the slave station microcomputer 7 expands the width of the pulse signal in accordance with the voltage value so that the brightness of the hall button lamp 6 is maintained in an optimum state. By changing the width of the pulse signal, the brightness of the hall button lamp 6 is maintained even when the DC voltage V12 is lowered.

Next, an abnormality detection method for the DC voltage V12 using the power supply monitoring circuit 16 will be described with reference to FIG.
FIG. 5 is a block diagram of the power supply monitoring circuit of FIG.

  In FIG. 5, reference numeral 17 denotes a low-pass filter circuit. The low-pass filter circuit 17 has a function of removing high-frequency ripple noise included in the input DC voltage V12. Reference numeral 18 denotes a sample and hold circuit. The sample and hold circuit 18 has a function of holding the voltage that has passed through the low-pass filter circuit 17 at an arbitrary measurement timing. Reference numeral 19 denotes an A / D conversion circuit. The A / D conversion circuit 19 has a function of converting the voltage that has passed through the sample and hold circuit 18 into a digital signal.

  With this configuration, the power supply monitoring circuit 16 suppresses the measurement error of the DC voltage V12 due to harmonic ripple noise. Further, by outputting a hold command from the slave station microcomputer 7, the power supply monitoring circuit 16 monitors the DC voltage V12 at an arbitrary measurement timing.

  Here, the DC power supply device 10 uses components that deteriorate over time, such as electrolytic capacitors. Electrolytic capacitors gradually decrease in capacitance due to aging. When the capacitance decreases, the power supply capability of the DC power supply device 10 decreases. At this time, if the load current of the hall operating panel 3 or the like is large, the output voltage of the DC power supply device 10 decreases.

  As described above, in a system that is used for a long period of time such as an elevator, the performance of the DC power supply device 10 deteriorates during the operation period. If the DC power supply 10 to be replaced due to aging is left for maintenance and inspection, the output voltage of the DC power supply 10 becomes unstable. As a result, the device supplied with power from the DC power supply device 10 does not operate normally.

  Therefore, the master station microcomputer 2 is prepared in advance with measurement operation conditions in which the current flowing through each device such as the hall operating panel 3 is larger than that during normal operation. The master station microcomputer 2 transmits a control signal corresponding to the measurement operation condition to the slave station microcomputer 7. When the slave station microcomputer 7 receives the control signal, the slave station microcomputer 7 controls the digital indicator 4, the landing button lamp 6 and the like so that the current value becomes maximum.

  At this timing, the slave station microcomputer 7 transmits a hold command to the power supply monitoring circuit 16. When the power monitoring circuit 16 receives the hold command, the power monitoring circuit 16 monitors the DC voltage V12. The slave station microcomputer 7 transmits the monitoring result and the determination result based on the monitoring result to the master station microcomputer 2 and displays the result on a display device such as the digital indicator 4 controlled by itself.

  According to the first embodiment described above, the connection state of the resistor is switched based on the voltage value monitored by the power supply monitoring circuit 16. As a result, the received signal is divided so that it can be normally determined. For this reason, even when the output voltage of the DC power supply device 10 becomes low, the signal can be correctly transmitted. Thereby, the cheap DC power supply device 10 can be applied, or the DC power supply device 10 can be provided for more floors. As a result, the signal transmission device can be made inexpensive.

  Further, if the circuit constants of the control circuit of each device are switched based on the voltage value monitored by the power supply monitoring circuit 16 so that each device can operate normally, each device can be operated normally with an inexpensive system. be able to.

  Further, when the output voltage of the DC power supply device 10 is monitored in an operation state in which the power consumption of each device is maximized, the deterioration status of the DC power supply device 10 can be confirmed more quickly and more remarkably.

  Further, when the voltage value monitored by the power supply monitoring circuit 16 is abnormal, the slave station microcomputer 7 displays on the display device such as the digital indicator 4 or notifies the master station microcomputer 2 that the voltage is abnormal. To do. For this reason, the occurrence of an abnormality can be recognized immediately, and it is not necessary to investigate the cause of the abnormality. Furthermore, if the threshold value for determining an abnormality is set to a value before each device becomes inoperable, the state of the output voltage of the DC power supply device 10 is confirmed before a malfunction that makes each device inoperable occurs. be able to. Thereby, the maintenance of the DC power supply device 10 can be planned in advance.

  The control for dividing the signal may be applied to a master station microcomputer 2 or a slave station microcomputer (not shown) provided in an elevator car (not shown).

  In addition, when the control signal from the master station microcomputer 2 is divided, a plurality of resistors that can be individually ON / OFF controlled by the slave station microcomputer 7 may be used. In this case, the voltage dividing circuit constant can be set to an appropriate value over a wide range with respect to the DC voltage V12. Further, when the control signal is divided, a diode element or the like may be used instead of the resistor. Furthermore, when switching the voltage dividing circuit constant, ON / OFF control may be performed by another switching element (for example, a relay, a photocoupler, a transistor, etc.) instead of the FET element 15.

DESCRIPTION OF SYMBOLS 1 Elevator control panel 2 Master station microcomputer 3 Landing operation panel 4 Digital indicator 5 Landing button 6 Landing button light 7 Slave station microcomputer 8 1st signal transmission line 9 2nd signal transmission line 10 DC power supply device 11 Power supply bus line 12 Power supply line 13 Ground line 14 DC power supply regulator IC
15 FET element 16 Power supply monitoring circuit 17 Low pass filter circuit 18 Sample & hold circuit 19 A / D conversion circuit

Claims (6)

A master station installed in the elevator control panel;
A slave station provided in the elevator hall or car;
A power supply device for supplying power to the one of the master station and the slave station via an electric wire;
By using the voltage supplied through the wire from the power supply device in proximate one of said master station and said slave station, via the signal line toward one from the other of said master station and said slave station Voltage dividing means for dividing the voltage of the transmitted signal in the vicinity of one of the master station and the slave station;
Monitoring means for monitoring the voltage supplied from the power supply device to the voltage dividing means with the electric wire in the vicinity of one of the master station and the slave station;
Based on the voltage value monitored by the monitoring means, the dividing value is such that the voltage value when the voltage of the signal is divided is within a range that can be normally determined by one of the master station and the slave station. Control means for controlling the pressure means;
An elevator signal transmission device comprising: The voltage dividing means comprises a plurality of resistors,
The control means, based on the voltage value monitored by the monitoring means, the voltage value when the voltage of the signal is divided falls within a range that can be determined by one of the master station and the slave station. The elevator signal transmission device according to claim 1, wherein connection states of the plurality of resistors are switched to each other. The power supply device supplies power to a device provided near one of the master station and the slave station,
2. The control unit according to claim 1, wherein the control unit switches a circuit constant of a control circuit of the device so that the device can operate normally based on a voltage value monitored by the monitoring unit. The elevator signal transmission device according to claim 2. The power supply device supplies power to the slave station and supplies power to equipment provided in the vicinity of the slave station,
The monitoring means, when the power consumption of the device is maximized by the slave station receiving a signal corresponding to the measurement operating condition from the master station, from the power supply device to the slave station and the device. The elevator signal transmission device according to claim 1 or 2, wherein the supplied voltage is monitored by the electric wire in the vicinity of the slave station. The power supply device supplies power to the slave station,
The voltage dividing means divides the voltage of the signal transmitted from the master station to the slave station,
The monitoring means monitors the voltage supplied from the power supply device to the voltage dividing means with the electric wire in the vicinity of the slave station,
The slave station, when the voltage value monitored by the monitoring means is abnormal, causes an indicator provided in the vicinity of the slave station to display an abnormality. The elevator signal transmission device according to any one of claims 4 to 4. The power supply device supplies power to the slave station,
The voltage dividing means divides the voltage of the signal transmitted from the master station to the slave station,
The monitoring means monitors the voltage supplied from the power supply device to the voltage dividing means with the electric wire in the vicinity of the slave station,
The said slave station notifies that it is abnormal to the said master station, when the value of the voltage monitored by the said monitoring means is abnormal. Elevator signal transmission device.

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