JP2677672B2 - Elevator position detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to an elevator position detection device.

(Prior Art) With the rapid progress and widespread use of microcomputer technology in recent years, a microcomputer has been widely applied to a control device of a simple elevator.

When applying a microcomputer to an elevator control device, a semiconductor circuit is used to detect the position in place of the selector (mechanical detector that detects the position by reducing the movement of the elevator) that has been used for position detection in the past. In this way, the counter circuit counts the pulse input signal from the pulse generator that generates the pulse signal synchronized with the movement of the elevator, and the count data is transmitted and input to the microcomputer as the position data of the elevator. , The structure that serves as the basis of elevator operation has been adopted.

FIG. 3 shows a circuit configuration of such a conventional elevator position detecting device. 1 is an elevator car, 2 is a hoisting machine, 3 is a hoisting drive motor, 4 is a pulse generator which rotates in synchronization with the electric motor 3, 5a and 5b are pulse signals generated from the pulse generator 4, and 6 are these pulses Input circuits for signals 5a and 5b, 7a and 7b are pulse input signals, 8 is a counter circuit, 9 is a normal power source, 10 is a battery for memory backup, 11 is a battery / power source switching circuit, and 12 is a battery backup power source.

Further, 13 is a counter data output signal, 14 is a counter data input bus buffer, 15 is a microcomputer bus line, 16 is a data set bus buffer, and 17 is a count data set signal.

In this conventional elevator position detection device, an elevator car 1 is suspended by a hoisting machine 2 and is lifted and lowered by a hoisting machine 2 directly connected to an electric motor 3 so that the car 1 reaches a predetermined floor. The electric motor 3 is controlled.

A pulse generator 4 is directly connected to the electric motor 3,
A pulse signal is generated in synchronization with the movement of the electric motor 3. That is, when the rotation of the electric motor 3 is fast, a large number of pulses are generated within a fixed time, and when the rotation is slow, the number of pulses is small.

The pulse signals 5a and 5b thus generated are given to the pulse input circuit 6 via the transmission line, where noise removal and waveform shaping are performed, and the pulse input signals 7a and 7b are given to the counter circuit 8. .

The counter circuit 8 is configured as a 16-bit counter by connecting a plurality of 4-bit counters in series. Further, the counter circuit 8 detects the driving direction based on the positional relationship of the pulse input signals 7a and 7b, and outputs the pulse input. By performing up-counting and down-counting of signals, the position of the elevator car 1 can be relatively determined.

The data counted by the counter circuit 8 is output as a counter data output signal 13, and is input to a bus line 15 to a host microcomputer (not shown) via a counter data input bus buffer 14 and various data is output to the host microcomputer. The calculation processing of is performed.

Further, in order to initialize the counter data at the time of position adjustment, the data setting bus buffer 16 is connected to the microcomputer bus line 15, and the counter circuit is set to set the predetermined data on a predetermined floor such as the bottom floor. The counter data set signal 17 is connected to the 8 set terminal. That is, at the beginning of the adjustment, the data of the counter circuit is indefinite, and by setting the data for the reference floor such as the lowest floor, the position of the elevator car 1 can be compared with the count value of the pulse input signal in comparison with this reference data. Should be determined.

In such an elevator position detecting device, it is necessary to retain the data of the counter circuit 8 even during a power failure, and normally the normal power source 9 is used as the battery / power source switching circuit.
Although it is applied to the counter circuit 8 via 11,
When the voltage of the normal power source 9 becomes lower than a predetermined value,
Backup of the data memory is performed by switching the battery / power supply switching circuit 11 so that the memory backup battery 10 supplies the counter circuit 8 as the battery backup power supply 12.

For example, the normal power supply 9 has a voltage of about 5V, but in the event of a power failure, a voltage power of about 2 to 3V is supplied from the memory backup battery 10 to the counter circuit 8 to retain the data of the counter circuit 8. Do it.

(Problems to be Solved by the Invention) However, in such a conventional elevator position detecting device, normally, the number of pulses generated from the pulse generator is about 1 pulse for a traveling length of 1 to 10 mm,
Since a large number of pulses are input during the entire lifting process, a counter device of 16 bits or more is usually required as the counter circuit 8, and circuits such as a counter data input bus buffer and a data set bus buffer are required. A large number of signal lines are required to connect between the two, and the counter circuit calculates only the counter data and outputs it to the upper microcomputer to calculate the operating floor and stop floors of the upper microcomputer. Since the calculation process and the calculation process regarding the display of the operating floor are performed, there is a problem that a high-order microcomputer that performs various processes necessary for elevator operation control such as data transmission imposes a heavy load. . In addition, a simple counter circuit cannot sufficiently determine the positional relationship of pulses and the rationality of count data, and there is a problem that sufficient backup cannot be performed for an important function of detecting the position of an elevator. .

The present invention has been made in view of the above conventional problems, and applies a microcomputer for pulse counting so that a lot of data processing related to position detection can be performed, and a high-order micro computer correspondingly. A position detecting device for an elevator that can reduce the circuit component configuration for transmitting and receiving data to and from a computer and also reduce the load on the host microcomputer, and can perform sufficient backup for the position detecting function of the elevator. The purpose is to provide.

[Configuration of the Invention] (Means for Solving the Problems) An elevator position detecting device according to the present invention includes a pulse generator that generates a pulse synchronized with the movement of the elevator, and an input circuit for a pulse signal generated by the pulse generator. , A pulse count microcomputer for detecting the position of the elevator by a pulse input signal from this input circuit and storing data in the memory, and a normal power supply as a power supply circuit for the pulse count microcomputer and data stored in the memory A memory backup battery for giving a memory backup voltage required only for holding; a battery / power supply switching circuit for switching to the memory backup battery side when the voltage of the normal power supply drops; and a circuit for outputting the same voltage as the normal power supply. 2 battery circuit, in front In which the normal power supply voltage and a microcomputer power supply switching circuit for applying a predetermined period of time, the battery power source switching circuit the second battery circuit to the microcomputer for the pulse count to switch the output from when reduced.

(Operation) In the elevator position detecting device of the present invention, the pulse counting microcomputer performs arithmetic processing on the pulse signal from the pulse generator that generates the pulse synchronized with the movement of the elevator, thereby performing the elevator position detection. You can

Then, the position detection data obtained by the calculation result of the pulse counting microcomputer is transmitted to the host operation control microcomputer and can be used for necessary elevator operation control.

As the power supply circuit for the pulse counting microcomputer, normal power is supplied from the normal power supply through the battery / power supply switching circuit and the microcomputer power supply switching circuit during normal operation. The computer power supply switching circuit supplies power from the second battery circuit to the pulse counting microcomputer, and performs arithmetic processing on the pulse input signal from the pulse generator for a certain period of time until the elevator stops at a predetermined floor. The result of the position detection processing is stored in the memory.

After the elevator is completely stopped and the position detection data corresponding to the stop floor of the elevator is stored in the memory, the microcomputer power supply switching circuit is switched to the memory backup battery side in the battery / power supply switching circuit. Power from the backup battery is supplied to the pulse counting microcomputer to back up this memory data.

Therefore, when the power failure is restored, the pulse counting microcomputer secures the position data for the floor where the elevator is stopped, and the smooth position detecting operation can be restarted even when the elevator is restarted.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, and the same parts as those of the conventional circuit shown in FIG. 3 are designated by the same reference numerals.

That is, 1 is an elevator car, 2 is a hoist, 3 is a hoist drive motor, 4 is a pulse generator, and a pulse signal is generated in synchronization with the rotation of the hoist drive motor 3,
The pulse input circuit 6 removes noise from the pulse signals 5a and 5b from the pulse generator 4 and shapes the waveform to generate pulse input signals 7a and 7b and apply them to the pulse counting microcomputer 18.

The microcomputer 18 is provided with an oscillator 19, operates according to the frequency of the oscillator 19, performs counter processing of the elevator position based on the pulse input signals 7a, 7b by a counter provided inside, and further performs various arithmetic processing. By doing so, calculation of elevator floors, floors that can be stopped, etc., and hexadecimal conversion for displaying position data are performed, and arithmetic processing data is bidirectionally written to the output memory 21 via the data input / output bus line 20. It is like this.

The microcomputer bus line 15 for a higher-level elevator operation control microcomputer (not shown) is connected to this bidirectional input / output memory 21 so that the upper-level microcomputer can access and write necessary data. You can do it.

As a power supply circuit for the pulse counting microcomputer 18, a battery / power supply switching circuit 11 for the normal power supply 9 and the memory backup battery 10, a battery backup power supply 12 from the battery / power supply switching circuit 11 and a time limit battery backup circuit 22 are provided. A microcomputer power supply switching circuit 24 for switching between the time limit battery power source 23 and a second battery 25 connected to the time limit battery backup circuit 22 and capable of giving a voltage equal to that of the normal power source 9 are provided. Then, the microcomputer power supply 26 from the microcomputer power supply switching circuit 24 is input to the pulse counting microcomputer 18.

Next, the operation of the elevator position detecting device having the above configuration will be described.

A pulse signal is output from the pulse generator 4 in synchronization with the raising / lowering operation of the car 1, noise is removed and the waveform is shaped through the pulse input circuit 6, and the pulse input signals 7a and 7b are input to the pulse counting microcomputer 18. .

Pulse count microcomputer 18 is an oscillator
It operates according to the frequency of 19 and counts the position by the counter provided inside. In addition, after performing various arithmetic processing, calculating elevator floors, floors that can be stopped, etc., and performing hexadecimal variables etc. to display position data, both are sent via the data input / output bus line 20. The data of the arithmetic processing result is written in the input / output memory 21.

Higher-level operation control microcomputer (not shown)
At any time, the bidirectional input / output memory 21 is accessed to take out necessary data and write data.

The operation of the power supply circuit of the pulse counting microcomputer 18 will be described below. In order to prevent the position data from shifting when the normal power supply 9 is cut off or when the power is cut off, the power supply is switched by the following control method.

That is, when the voltage of the normal power supply 9 drops and becomes equal to or lower than a predetermined voltage, the battery backup circuit 22 operates at any time to supply power from the second battery 25, and a voltage substantially the same as that in the normal power supply 9 is supplied to the micro Microcomputer for pulse counting via computer power supply switching circuit 24
Give to 18.

Then, the time limit battery backup circuit 22 cuts off the power supply from the second battery 25 after allowing a certain margin after the elevator stops at a predetermined floor, and the voltage of the time limit battery power supply 23 decreases.

When the voltage of the time limited battery backup power supply 23 drops, the microcomputer power supply switching circuit 24
Is switched to the battery / power supply switching circuit 11 side, and this battery / power supply switching circuit 11 is switching from the normal power supply 9 to the memory backup battery 10 The backup power supply 12 from the memory backup battery 10 is pulsed as the microcomputer power supply 26. This is given to the counting microcomputer 18, and the memory of the pulse counting microcomputer 18 is backed up.

The backup operation of the power supply circuit for the pulse counting microcomputer 18 will be described in more detail. As shown in the time chart of FIG. 2, the power supply waveform a of the normal power supply 9 has a power failure or power cutoff at a certain timing t ₀ . And the battery backup power supply
The waveform b of 12 has the same voltage while the normal power supply 9 is being supplied, but after the power failure occurrence timing t ₀ , the voltage drops and switches to the voltage V ₁ of the memory backup battery 10.

Next, the voltage waveform c of the time limit battery backup circuit 22
Holds the normal voltage V ₂ for a certain period T even after the voltage drop timing t ₀ of the normal power supply 9, and after the elevator is completely stopped and the data of the counter of the pulse counting microcomputer 18 is fixed. Backup is stopped at timing t ₁ .

Therefore, the microcomputer power supply switching circuit 24
As for the voltage waveform d of the microcomputer power supply 26 from the above, the normal power supply voltage V ₂ is held until the timing t ₁ , and then the voltage is switched to the voltage V ₁ of the memory backup battery 10 and the memory backup operation is started.

In this way, using the pulse counting microcomputer, the data processing conventionally performed by the higher-level elevator operation control microcomputer, that is, the position detection of the elevator, the determination of the stoppable floor, the creation of the elevator position display signal, etc. In order to perform high-level data processing on the side of the pulse counting microcomputer 18, the arithmetic processing operation of the pulse counting microcomputer 18 is performed while the elevator car 1 is in operation and the pulse signal is input from the pulse generator 4. The second battery is held by the timed battery backup circuit 22 for the purpose of holding it.
A power supply of the same voltage as the normal power supply 9 is supplied from 25, and a memory backup battery is used to back up the memory of the fixed data after the data is fixed.
When the elevator is restarted, the pulse count microcomputer 18 immediately executes the arithmetic processing according to the input pulse signal from the pulse generator 4 based on the data stored in the memory 21 when the elevator is restarted. Can be restarted, and the complicated procedure for restarting can be eliminated.

As described above, according to the present invention, in the conventional circuit, the pulse count circuit performs pulse counting on the pulse input signal from the pulse generator, and the pulse count data is transmitted to the host microcomputer. Therefore, the upper microcomputer side performs arithmetic processing to perform elevator position, stop floor, stoppable floor, and other indexing,
By using the pulse counting microcomputer, the pulse counting microcomputer can be performed, and the burden on the host microcomputer can be reduced.

In addition, since most of the arithmetic processing for the pulse signal from the pulse generator is performed on the side of the pulse counting microcomputer, there is no need for a bus buffer for data set input, count data input, etc. from the upper microcomputer side. The circuit configuration can be simplified.

Further, as a power supply circuit of the pulse counting microcomputer, a battery / power supply switching circuit between a normal power supply and a memory backup battery, and a second battery circuit for applying the same voltage as the normal power supply are provided to stop or cut off the normal power supply. Even when the elevator car moves to a predetermined stop floor and stops, that is, when there is an input signal from the pulse generator, arithmetic processing is performed on the pulse input signal, and when the data is confirmed, the memory is stored. Since the battery power for memory backup is switched to keep the data recorded in the memory, the pulse count micro-counter can be based on the data stored in the memory without performing many procedures when restarting. The computer immediately responds to the pulse input signal from the pulse generator. Can resume the calculation processing, it is possible to prevent the occurrence of inconvenience at the time of a power failure or interruption of the normal power supply.

[Brief description of the drawings]

FIG. 1 is a circuit configuration diagram of an embodiment of the present invention, FIG. 2 is a time chart for explaining the operation of the above embodiment, and FIG. 3 is a circuit configuration diagram of a conventional example. 1 …… Car 2 …… Hoisting machine 3 …… Drive motor 4 …… Pulse generator 6 …… Pulse input circuit 9 …… Normal power supply 10 …… Memory backup battery 11 …… Battery / power supply switching circuit 12 …… Battery backup power supply 15 …… Microcomputer bus line 18 …… Pulse count microcomputer 21 …… Bidirectional input / output memory 22 …… Timed battery backup circuit 23 …… Timed battery power supply 24 …… Microcomputer power supply switching circuit 25 …… Second battery 26 …… Microcomputer power supply

Claims (1)

(57) [Claims] 1. A pulse generator for generating a pulse synchronized with the movement of an elevator, an input circuit for a pulse signal generated by the pulse generator, and a pulse input signal from the input circuit for detecting the position of the elevator and storing it in a memory. A pulse counting microcomputer for storing data; a normal power supply as a power supply circuit for the pulse counting microcomputer; and a memory backup battery for giving a memory backup voltage required only for holding the stored data of the memory, A battery / power supply switching circuit that switches to the battery side for memory backup when the voltage of the normal power supply drops, a second battery circuit that outputs the same voltage as the normal power supply, and a predetermined time when the normal power supply voltage drops. Battery / power supply switching Position detecting device for an elevator comprising a microcomputer power source switching circuit switches the output from the road to the second battery circuit provided to the microcomputer for the pulse count.