JPS5926590B2 - elevator equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates generally to elevator systems, and more particularly to a new and improved hall light circuit for an elevator system.

Elevator equipment that has one or more elevator cars installed in a building for service on floors within a building has a rising landing light provided for each floor where the car ascends and descends. and a descending landing light for each car.

Only an ascending landing light and a descending landing light are required on the bottom floor and the top floor, respectively, where a particular car is in service. Lamps used in hall lights usually draw large rush currents that quickly settle to smaller values when their filaments are heated and reach their normal operating temperature.

The circuit containing the lamp will fail in a low resistance or short circuit mode, causing a very large current to flow through the low resistance or short circuit load. Rush current conditions and short circuit conditions are handled without undue expense when utilizing electromagnetic relays in the lamp drive circuit. However, in at least some applications, it is desirable to use solid state switching devices or semiconductor switching devices in lamp drive circuits. However, since lash currents and short circuits associated with landing light circuits can cause solid-state components to fail, attempting to reduce failure by selecting semiconductor switching elements with current ratings that can withstand lash and short circuit currents can be very expensive. become. The primary object of this invention is to provide an elevator system that uses solid state hall light circuits to eliminate the problems of lash current and short circuits.

With this object in mind, the present invention provides a multi-story building, an elevator car mounted to move within the building for servicing the floors, and an elevator car for servicing at least some of the floors of the building in which the car serves. In an elevator system having disposed hall light lamps and a power supply circuit, a drive circuit is provided that selectively connects the hall light lamp to the power supply circuit in response to a predetermined action of force, and the power supply circuit is Means is provided in the power supply circuit for supplying current to the selected hall light lamp and for limiting the current supplied to the selected hall light lamp to a predetermined maximum value smaller than the normal lash current of the hall light lamp. There is an elevator system characterized in that:

Briefly, this invention relates to a new and improved elevator system that includes one or more cars mounted for service on the floors of a building.

Each car has a landing light associated with the floor it serves. The new and improved hall light circuit can use semiconductor switching devices that are inexpensive and have a long operating life. A landing light circuit for a particular car includes a power supply circuit, a plurality of lamps, and a predetermined function of the force (e.g., deceleration when the car is coming to a stop on a floor requesting ascending or descending service). and a plurality of drive circuits for selectively connecting the lamps to the power supply circuitry in response to the activation of the lamps.

The power supply circuit includes means for limiting the maximum current supplied to the lamp circuit at any time.

This maximum current is less than the normal lash current for a cold lamp. By limiting the lash current, smaller and cheaper semiconductor switching devices can be used in the lamp drive circuit. For example, the transistor may be selected to operate in saturation mode when conducting. The semiconductor switching elements in the lamp drive circuit are protected in the case of short-circuit loads, since the maximum current and therefore the maximum power consumption is limited. Only the semiconductor switching elements in the current limiting part of the power supply circuit need to be chosen to have a large power dissipation capacity in order to withstand the large voltage drop across the semiconductor switching element when the lash current is applied to the cold lamp. .

However, it is impractical to use semiconductor switching devices large enough to withstand the power dissipation resulting from shorted loads. The present invention solves this problem by distinguishing between normal lash current to a cold lamp and a low resistance or short circuit load. A shorted load will cause the power supply circuit to shut down. In a preferred embodiment of this invention,
The current limit instruction signal is supplied from a power supply circuit that is supplying a predetermined maximum current to the drive circuit and lamp circuit.

A protection circuit monitors this current limit indication signal and starts a timer circuit when it is initiated. If the current limit indication signal persists for longer than the normal time for the lash current to the lamp to settle to a value less than the predetermined maximum value, a timer circuit is set to time out. If the timer circuit times out, this indicates an abnormal condition and the protection circuit provides a stop signal that shuts down the power supply circuit. However, since only one lamp circuit out of a large number of lamp circuits is likely to be shorted, the present invention makes available non-shorted hall light circuits.

A driver inhibit circuit is provided that inhibits all drive circuits in response to a stop signal provided by the protection circuit. Note that the driver prohibition signal continues even after the current limit instruction signal stops.
last. The invention will become more easily apparent from the following illustrative description with reference to the accompanying drawings.

"FIG. 1 shows an elevator system 10 that can utilize the present invention.
shows. This elevator device 10 is an elevator car 1
2, the movement of which can be controlled by the system processor 11. Since each car in the force group and its Fbl legs are all identical in construction and operation, only the controls for force group 12 will be illustrated and described. Car 12 is mounted in hoistway 13 and moves relative to building 14 .

The building 14 has, for example, 30 floors, but only the first, second, and 30th floors are shown to simplify the drawing. Force-12 is suspended by rope 16. The rope 16 is hung on a groove wheel 18 mounted on the shaft of the hoist motor 20. The electric motor 20 is a DC motor, such as one used in a Ward-Leonard drive system or a solid state drive system, for example. A counterweight 22 is tied to the other end of the rope 16. A governor rope 24 tied to the top and bottom of the force 12 is hung over a governor car 26 installed above the highest point of car operation in the hoistway 13 and installed at the bottom of the hoistway. It is hung on a pulley 28. The pickup 30 is arranged so that the car 1
2 is arranged to detect the movement of 2. The spacing of the holes 26A is adjusted for each standard increment of force, e.g., 12.
It is designed to emit one pulse for every movement of 7 dragons (0.5 inch). Pickup 30, which may be of any suitable type, such as optical or magnetic, pulses in response to movement of bore 26A in the governor wheel. Pickup 30 is connected to a pulse detector 32 which provides distance pulses for a landing selector 34. The distance pulses can be generated by any other suitable means, for example by a pick-up (mounted on the car) in conjunction with regularly spaced indicia in the hoistway. Car calls, as specified by pushbutton array 36 provided in car 12, are recorded and serialized in power call controller 38.

As a result, the serialized car call information is sent to the hall selector 34.
sent to. Hall calls, such as those designated by pushbuttons provided at the landing, such as the up/down pushbutton 40 for the first floor, the downpush button 42 for the 30th floor, and the up/down pushbutton 44 for the second and other intermediate floors, are It is recorded and serialized in the call controller 46.

As a result, the serialized hall call information is sent to the system processor 11. The system processor 11 sends a landing call to the cars through the interface circuit 15 to ensure that each floor of the building is in service efficiently and that the cars are used effectively. Landing selector 34 processes the distance pulses from pulse detector 32 to generate information regarding the position of car 12 in hoistway 13 and also sends the processed distance pulses to speed pattern generator 48.

This speed pattern generator 48 generates a speed reference signal for a motor controller 50, which in turn provides a drive voltage to the motor 20. Landing selector 34 continues to track force-12, i.e., continues to track the car service call;
An acceleration signal is requested from the speed pattern generator 48. The landing selector 34 also indicates that the force is decelerated according to a predetermined deceleration pattern and that the landing selector 34 selects a predetermined floor (for which the service call has been designated).
provides a deceleration signal for velocity pattern generator 48 at the precise time required to stop. Additionally, the hall selector 34 provides signals to control the door operator 52 and controls the reset of the car call controller 38 and hall call controller 46 when a car or hall call is activated. The hall selector 34 also provides signals for controlling the hall light controller 54, and the present invention is directed to a new and improved hall light circuit for the hall light controller 54. Landing, that is, floor alignment of the car, is performed by a hoistway converter utilizing a guide plate 56 provided at each floor and a transformer 58 provided in the car 12. Motor controller 50 includes a speed regulator that is responsive to a reference pattern provided by speed pattern generator 48 . Speed control may be derived from a comparison of the actual speed of the motor and the speed required by the reference pattern by using known track magnetic regulators. The precision landing device uses a guide plate 56 and a transformer 58 in a known configuration. Overspeed conditions near the lower or lower end point are detected by the pickup 60 and end point vane 62 combination.

It is desirable that the pickup 60 is provided in the car 12.
Termination vanes 62 are provided near each termination point. The end vanes have spaced apart holes, such as toothed edges. The spacing of the teeth is such that a pulse is generated in the pick-up 60 when the teeth and the pick-up 60 move relative to each other. This pulse is processed by pulse detector 64 and sent to velocity pattern generator 48. Note that this pulse is used to detect overspeed. A new and improved landing selector 34 for driving a single car independently of the driving of cars in a fleet is disclosed in U.S. Pat.
No. 50,850. The platform selector 34 is selected by the system processor 11 as used here.
Variations necessary to adapt the to group operation and control (
) of the landing selector 34 is specified in Japanese Patent Application No. 49-27824 (Japanese Patent Publication No. 57-41432). The particular signal obtained from the hall selector 34 and used by the hall light controller 54 is an advanced car position signal AVP which gives the floor of the advanced car position in binary.
O to AVP6, and the set signal PCR (Figures 3 and 4A) becomes low level (true) every time the advancing car position changes floors.
(see figure) and a clock signal S2S.

The advancing car position signals AVPO-AVP6 are generated in a counter, the PCR is generated in a synchronization circuit, and the clock signal S2S is one output of the scan counter. Figure 2 shows floor 0
The advancing car position signals AVPO to AV for each of ~64
P6 and position selection signals PSECO to PSEC3. The position selection signals PSECO-PSEC3 are derived from the fourth bit AVP3 and the fifth bit AVP4 of the advancing car position signals AVPO-AVP6, as will be described later. FIG. 3 is a block diagram of a new and improved hall light circuit 70 that can be used in the hall light controller 54 shown in FIG.

In conventional hall light circuits, an electrical-mechanical relay was provided to turn on each hall light. New elevator equipment that utilizes solid-state components in the landing selector, power station, car controller, system processor, and associated circuitry may be found on various floors of the building in which the power station operates. It is desirable to use solid state drive circuits for lamps in combination with raised and lowered landing lights. Each car in a force group has its own set of landing lights associated with the hoistway in which the car is driven and the particular floor on which it is servicing. The lowest floors where the car is in service are provided with only ascending landing lights, the top floors are provided with only descending landing lights, and intermediate floors are provided with both ascending and descending landing lights. An audible signal, such as a conch, is normally emitted at each floor for each car serving that level, and this signal is initiated when its associated landing light (rising landing light or descending landing light) is turned on, and is then activated by the car. Attracting the attention of the passengers about to board the vehicle to the location of the arriving car and its direction of service. Incandescent lamps commonly used in landing light circuits are
When lit, it draws a large initial current several times its normal operating current.

This large lash current flows because the filament of an incandescent lamp is cold. When an incandescent lamp reaches its normal high operating temperature, the filament resistance decreases. Semiconductor switching devices increase in cost as their current ratings increase, so the cost of the solid-state or semiconductor switching devices required to carry the large lash currents of incandescent lamps is limited to only carry the normal operating current of incandescent lamps. This is significantly higher than the cost of the semiconductor switching device chosen to carry the current. Another problem in applying solid state drive circuits to lamp circuits is the possibility of lamp failure during short circuit mode. This causes short circuit currents to flow which can readily damage the semiconductor switching element, even if the semiconductor switching element is chosen to handle the large lash currents of the lamp. Providing a solid state drive circuit for each landing light would also be very expensive in high rise buildings with power groups.

The reason for this is that each drive circuit not only includes several semiconductor switching elements such as transistors, but also bias resistors, rectifying diodes, and logic elements for turning on and off the lamp in synchronization with the start and stop of the car. Because you need it. In addition to the hall lights, each car includes a plurality of relatively small lamps associated with car position indicators. The power position indicator turns on the lamp associated with the floor of the power car's position. When Rikiichi is stationary, the advancing car position is the floor where the car is located. When the car is in motion, the forward car position is the floor at which the car can come to a normal stop according to the planned deceleration schedule. The force-to-position indicator is normally activated from contacts located on the electro-mechanical landing selector. Preferably, the lamp is provided with a solid state drive circuit driven by a signal from a solid state landing selector. However, the short-circuit problem in the hall light circuit just described is also applicable here. This is because it is the same economic problem that a car used in a high-rise building requires a very large number of drive circuits. The hall light circuit 70 solves the lash current problem and allows each solid state drive circuit to utilize semiconductor switching devices selected to receive a limited value of lash current.

A current limited power supply circuit is provided which allows each semiconductor switching element to operate in saturation mode when normal lamp current is applied. This power supply circuit protects each drive circuit from overcurrents (both rush currents and short circuit currents). Therefore, smaller and cheaper semiconductor switching elements than ever before can be used in the drive circuit. Landing light circuit 7
0 also includes a short circuit detection circuit that quickly removes shorted loads from the current limited power supply circuit to prevent damage to semiconductor switching elements in the power supply circuit.

The hall light circuit 70 shown in FIG. Significantly reduce the number of state drive circuits.

The binary advancing car position signals AVPO-AVP6 are used to selectively energize predetermined rows and columns, and energize lamp diode circuits connected between the energized rows and columns. do.

Thus, for example, an 8x8 drive utilizing only 16 drivers
The matrix selectively energizes 64 lamps, saving 48 solid state drivers and reducing the number of external connections to the hall light circuit. The matrix configuration includes car position lamps in combination with force-position indicators as well as any other car position lamps such as lamps that may be utilized above car doors on the main floor of a building and lamps that may be utilized in transport command stations. used for.

The force-position indicator matrix can be separated from the hall light matrix. However, in some applications it is advantageous to combine both matrices, since the same column drivers and conductors can be used for both functions. For example, in an eight column matrix, eight car position lamps may be selectively energized for each car position row driver added to the hall light matrix. To explain in detail, the block diagram in Figure 3 is
A new and improved landing light circuit 70 is shown.

The hall light circuit 70 includes a predetermined number of rows, each driven by a solid-state row driver 74, and a predetermined number of columns, each driven by a solid-state row driver 76.
including new and improved landing lights and a car position matrix 72 (driven by the car position matrix 72). A new and improved power supply circuit 78 provides a current limited circuit for the row drivers 74.
Supply driving voltage. As shown in FIG. 3, power supply circuit 78 is connected to a DC power source at terminal 80. The appropriate row driver selects the sixth bit A of position select signals PSECO-PSEC3 and advancing car position signals AVPO-AVP6.
VP5 or AVP5 and the platform light enable signal HLU
and the descending hall light enabling signal HLD. Position selection signal PSECO~PS
EC3 is provided by a decoder 82 which decodes the fourth bit AVP3 and the fifth bit AVP4 of the advancing car position signals AVPO-AVP6. Power supply circuit 7
8 is provided by a current limited delay circuit 84.

When a predetermined current limit is exceeded, power supply circuit 78 provides a current limit indication signal that initiates a timing circuit in delay circuit 84. This timer circuit is timed by clock signal S2S and delays shutting down of power supply circuit 78 long enough for the lamp filament to reach operating temperature and for its current to settle to the normal operating current. If the current limit indication signal persists for more than the time required for the lamp current to settle to its normal value, delay circuit 84 provides a current source stop signal. This stop signal is applied to the power supply circuit 78 to remove the drive power from the power supply circuit and zero power consumption in the row driver. The stop signal is also applied to driver inhibit circuit 86, which in turn provides a row driver inhibit signal. The row driver inhibit signal removes all loads from power supply circuit 78, which removes the current limit indication signal and returns power supply circuit 78 to normal operation. When a row moves to another floor, the reset signal PCR resets the driver inhibit circuit 86 and removes the row driver inhibit signal to the decoder 82. Therefore, a short circuit in combination with a lamp circuit will disable only the power supply circuit 78 for that particular lamp circuit, and when the power source moves to a floor with an unshorted hall light circuit, the power supply circuit 78 and the row, drive device 74 automatically returns to normal operation. Column driver 76 is decoder 88
driven by. This decoder 88 detects the seventh bit AVP6 of the advancing car position signals AVPO to AVP6.
or AVP6, the first bit AVPO, the second bit of the column enable signal and advancing car position signals AVPO to AVP6.
The appropriate column driver is driven in response to bit AVP1 and the third bit AVP2. 4A and 4B are circuit diagrams showing one embodiment of the hall light circuit 70 shown in FIG. 3, and the same parts as those in FIG. 3 are designated by the same reference numerals. The landing light and car position matrix 72 shown in FIG. 4B was chosen to illustrate the 16th floor as an example, and the matrix can be expanded to apply to any number of floors up to 128, as will be described later. can.

The hall light and car position matrix 72 includes first and second sets of conductors, with the first set of conductors referred to as row conductors and the second set of conductors referred to as column conductors.

However, it should be understood that the row and column conductors are interchangeable in function. The landing lights and car position matrix 72 are arranged on row conductors 90, 92, 94, 96, 98, 100.
, 102 and 104 and row conductor 10
6, 108, 110, 112, 114 and 116. All rows can be combined with drivers for ascending landing lights or descending landing lights, but
If desired, the landing light matrix provides an economical arrangement for indicating the advancing car position by car position indicators.
A car position indicator is provided in each car. Additionally, matrices similar to the landing lights and car position matrix 72 may be used at any other location, such as above the car doors on the main floor and/or at the transport control station, other than being directed solely to the function of providing power-position. It can be used to provide a car position indicator. Thus, matrix 72 combines the hall light function and the car position function, illustrating how the force-position function can be easily added to the hall light function, and which is the only one used in the matrix. This is an example of what you can get. Row conductors 106 and 108 are associated with descending landing lights located on all floors for a particular car (except the lowest floor where Rikiichi is in service).

Row conductors 110 and 112 are associated with elevated landing lights located on all floors for a particular car (except the top floor where Rikiichi is in service). Row conductors 114 and 116 are
For example, in combination with a car position lamp located inside the driver's cab of the car. row conductor 106 and seven column conductors 92,
94, 96, 98, 100, 102 and 104 are 1
It is combined with the descending hall lights of the floors to the seventh floor, and the row conductor 10
8 and 8 column conductors 90, 92, 94, 96, 98, 10
0, 102 and 104 are combined with the descending hall lights for the 8th to 15th floors.

The top floor where the force is in service is the 15th floor, so this 15th floor
A floor has only one landing light, a landing light that indicates the proceeding car position of cars arriving at that floor for down service.
The descending hall light on the 15th floor has a lamp 120 and a diode 122.
and a conc 124 or other suitable audible indicator, all connected in series between row conductor 108 and column conductor 104.

The diode 122 is connected in polarity to conduct current through the conc 124 and the lamp 120 from the row conductor to the column conductor; the diode is necessary to prevent one backflow'' and therefore false operation of the other lamps and concs. The lamp/diode conc structure for the descending hall light has the same configuration as the 15th floor.
A connection can be made between each of the two row conductors 106 and 108 and each column conductor.

However, the area between the row conductor 106 and the column conductor 90 is excluded. This is because there is no descending landing light on the lowest floor where the Riki- is in service. However, it is desirable for floors with both ascending and descending landing lights to utilize a common conch or audible signal. Therefore, the descending hall light on the first floor can utilize the diode 126, the lamp 128, and the conc 130 connected in series between the row conductor 106 and the column conductor 92, and the ascending hall light on the first floor can utilize the same diode 126, lamp 128, and conc 130 as described below. You can use conch. The remaining descending landing lights, along with the diodes and concs, were not shown in Figure 4B. This is because it is now clear how these are connected to the hall lights and car position matrix 72. Row conductor 110 and eight column conductors 90, 92, 94, 96, 9
The row conductor 112 and the seven column conductors 90, 92, 94, 96, 98, 100 and 102 are combined with the rising hall lights from the 0th floor to the 7th floor, and the row conductor 112 and the seven column conductors 90, 92, 94, 96, 98, 100 and 102 are the lights from the 8th floor to the 7th floor. Combined with the 14th floor ascending landing light.

The lowest floor on which Rikiichi enters service is the O floor, so the O floor has only one landing light, that is, the landing light that signals the proceeding car position of cars arriving at that floor for ascending service. The 0th floor ascending hall light requires a lamp 132, a diode 134 and a conc 136, which are connected to the row conductor 110 and column conductor 90.
connected in series between.

The first floor rising hall light is constructed by connecting a diode 138 and a lamp 140 in series between the row conductor 110 and one side of the conch 130 (that is, the side not connected directly to the column conductor 92). The first floor conch 130 already described for the descending landing light can be used.

A car position lamp for a running car position indicator provided in a car or otherwise may be readily provided by utilizing two row conductors 114 and 116 to indicate force-position. .

For example, lamp 142 and diode 144 can be connected in series between row conductor 114 and column conductor 90 to indicate the leading car position on the O floor, and lamp 146 and diode 148 to indicate the leading car position on the 8th floor. can be connected in series between row conductor 116 and column conductor 90. A similar diode-lamp combination is shown on row conductor 114.
and 116 and each of the remaining column conductors to complete the car position indicator. The selected lamp connects the associated row conductor to the DC power source and the associated column conductor to earth, allowing current to flow from the row conductor through the associated diode and lamp and, if the lamp is combined with a hall light, through the conc. is assisted by establishing a path.

Row and column conductors are selected by energizing row and column drivers, respectively. These then energize one of the up or down landing lights and the car position lamp depending on whether the up or down landing lights are enabled. Power-position lamps are enabled for both up and down landing lights. Row drive circuits A-F each have row conductors 106, 108, 110, 112, 114.
, 116, and column 1 drive circuits A-H respectively connect column conductors 90, 92, 94, 96, 98, 100,
102 and 104.

Since all the row drive circuits have the same configuration, only the row drive circuit F will be illustrated in detail, and since the column drive circuits have the same configuration, only the column drive circuit A will be illustrated in detail.
Specifically, the row driver F includes a three-input NAND gate 160, an inverter or not gate 162,
First, second and third semiconductor switching elements 164, 166 and 168 such as transistors, rectifying diodes 170, 172 and a resistor 176,
178, 180, 182, 184, 186 and 188
including.

NAND gate 160 has three input terminals A, B and C. Input terminal A is connected to terminal 190 via resistor 1r6.
It is permanently enabled for the force-position row driver F by being connected to a direct current power supply represented by . This input terminal A for the row driver for the ascending landing light and descending landing light.
are connected to receive a rising hall light enable signal HLU and a descending hall light enable signal HLD received at input terminals 192 and 194, respectively, from the call selection circuit in the hall selector of the associated car. The ascending hall light enable signal HLU and the descending hall light enable signal HLD are supplied when the driver attempts to stop at a predetermined floor and is enabled for an ascending call and a descending call, respectively. Once initiated, this signal lasts until the power stops at the floor, opens the door, and the door open time expires. Input terminal B of row drive circuit F
receives a position selection signal PSEC1 as shown in FIG.

This position selection signal PSEC1 operates the row drive circuit F for the 8th to 15th floors. Row drive circuits B and D (these are also 8
The input terminal B of the NAND gate in the row drive circuit for floors to floors 15 also receives the position selection signal PSEC1. O
Position selection signal SPE that activates the row drive circuit for floors to floors 7
CO (as shown in Figure 2) is connected to the row, drive circuits A and C.
and is applied to input terminal B of E. Position selection signal SP
EC2 and SPEC3 are not used in this example because they are used in buildings with higher storeys than those used in this example. For example, if the building is O
If it is a 32-story building from the 31st floor to the 31st floor, the position selection signal SPEC2
operates the row drive circuit for the 16th to 23rd floors, and the position selection signal SPEC3 operates the row drive circuit for the 24th to 31st floors. The decoder 82 includes, for example, four AND gates 1
91, 193, 195 and 197 and four inverters 199, 201, 203 and 205 to output the fourth bit A of the advancing car position signals AVPO to AVP6.
Position selection signals PSECO to PSEC3 are provided by decoding VP3 and the fifth bit AVP4.

The fourth bit AVP3 is applied to inverters 199 and 201.
is applied to each one input terminal of AND gates 193 and 197 through AVP3, and from the connection point of inverters 199 and 201 as bit AVP3.
95 input terminals. 5th bit AVP4
is applied to the other terminal of AND gates 195 and 197 through inverters 203 and 205, and bit AVP is applied from the connection point of inverters 203 and 205.
4 to the other input terminals of AND gates 191 and 193. Therefore, when both AVP3 and AVP4 are at a high level (this means that the advancing car position is from floor O to
(occurs when on a certain floor in a group of seven floors), the position selection signal SPECO is high or true. Position selection signal PSEC1 is true when AVP3 and AVP4 are both at a high level (this occurs when the proceeding car position is at a floor in the group of floors 8-15). Position selection signal PSEC2 is activated when AVP3 and AVP4 are both true (this occurs for the 16th to 23rd floors)
, is true. True when position select signals PSEC3 and AVP4 are both high (this occurs for floors 24-31). The position selection signals then repeat in the same order as described above for floors higher than the 32nd floor.
The output terminal of NAND gate 160 is connected to the input terminal of inverter 162, and the output terminal of inverter 162 is connected to terminal 190 through resistor 178 and connected to diode 1.
It is connected to the semiconductor switching element 164 via 70.

This semiconductor switching element 164 may be an NPN transistor. Diode 170 connects this transistor 16
4 and is connected to the polarity that causes current to flow into this base and switches transistor 164 to its saturation state when the output of inverter 162 is high. The base of transistor 164 is also connected to resistor 180.
is connected to ground 198 via. transistor 164
The collector c of is connected to the input terminal D via a voltage divider consisting of resistors 182 and 184. The input terminal D of the row drive circuit F and this same human power terminal D of the remaining row drive circuits are connected to a power supply circuit 78, which will be described later. This power supply circuit 78 limits the amount of current that can be drawn by the semiconductor switching elements in the row drive circuit. Therefore, the semiconductor switching elements in the row drive circuits need not be chosen to withstand the maximum current supplied by the power supply circuit 78 and to receive the normal large lash currents of a cold lamp. None. The semiconductor switching elements in the row drive circuits can therefore operate in saturated mode when conducting, resulting in a current rating lower than that which would have flowed if the current in the power supply circuit had not been limited. can be selected. Semiconductor switching elements are protected in the event of a short circuit in the load, since their power consumption is limited. As discussed below, if the maximum current in the power supply circuit continues to flow for longer than the time required for the lamp filament to reach its normal operating temperature and the current drawn by the lamp to settle to its normal value, the power supply The power supply circuit 78 is turned off to protect the semiconductor switching elements in the circuit. Emitter e of transistor 164 is connected to ground 198 and to anode a of diode 172.
A semiconductor switching element 166, which may be a PNP transistor, has its base b connected to the junction of resistors 182 and 184.

Its emitter e is connected to input terminal D, and its collector c is connected to negative pole b of diode 172 and output terminal E via resistor 186. Therefore, transistor 164
provides base drive to transistor 166 when turned on, switching transistor 166 into its saturated state. The collector c of transistor 166 is also N
Semiconductor switching element 168 which is a PN transistor
The base b of this transistor 168 is connected to the collector c of the transistor 166. The collector c of the transistor 168 is connected to the input terminal D via the resistor 188.
The emitter e is connected to the output terminal E. Output terminal E is also connected to a DC power supply represented by terminal 202 via diode 174 (the anode a of which is connected to output terminal E). This clamps the output voltage at output terminal E to the highest level set by the DC power supply connected to terminal 202. Transistor 166, when conducting, provides base drive to transistor 168, saturating it and connecting input terminal D to output terminal E. Output terminal E
is the row conductor 11 of the hall light and car position matrix 72
Connected to 6. During operation of the row drive circuit F, when any input to the NAND gate 160 is low, the NAND gate 160
The output of is high, which is inverted to a logic zero by inverter 162, causing transistor 164 to be in its non-conducting state. When transistor 164 is non-conducting, transistors 166 and 168 are also non-conducting and row conductor 116 of hall light and car position matrix 72 is not energized. If all inputs to NAND gate 160 are high, the output of NAND gate 160 will be driven low and inverter 162 will now provide a logic 1 output to turn on transistors 164, 166 and 168 and turn on the hall lights and Row conductors 116 of car position matrix 72 are connected to the output of power supply circuit 78 .
When one row drive circuit is turned on to energize one row conductor of the hall light and car position matrix, one column drive circuit is also turned on to connect a given column conductor to ground and thus energize a lamp connected between the energized row conductor and the grounded column conductor;

A specific column. The drive circuit selects the lower three bits of the advancing car position signal, namely AVPO, AVPl and AV
Activated by decoder 88 which decodes P2. The low level column enable signal AVP6 activates decoder 88;
Therefore, the decoder 88 for floors 0 to 63 is activated.
Bit AVP6 is used for floors 64 through 127, as will be seen when describing other embodiments of the invention. For example, Texas Instruments' 3-6 line
Decoder 88, which may be decoder SN74l55, has different low outputs for eight possible combinations of the bottom three bits of the advancing car position signal AVPO-AVP6. When the advancing car position is on floor O or floor 8, output conductor 210 of decoder 88 (which is connected to column 1 drive circuit A) is at a low level, but the other output conductors of decoder 88 are at a high level. Be at the level. Therefore, the lamp associated with floor 0 or floor 8 will be energized depending on which row conductor is energized. Similarly, the output conductor 212 connected to the time series 1 drive circuit B when the advancing car position is on the 1st floor or the 9th floor is driven to low level 1, and when the advancing car position is on the 2nd floor or the 10th floor.
The output conductor 214 connected to the time series drive circuit C located on the floor is driven to a low level, and the output conductor 216 connected to the time series drive circuit D whose advancing car position is on the 3rd or 11th floor is driven to a low level. When the traveling car position is on the 4th or 12th floor, the output conductor 218 connected to drive circuit E is driven to a low level, and when the traveling car position is on the 5th or 13th floor, the output conductor 218 is driven to a low level. The output conductor 220 connected to the drive circuit F is driven to a low level, and the output conductor 222 connected to the time series drive circuit G whose traveling car position is on the 6th or 14th floor is driven to a low level, and the car position is on the 7th or 14th floor
The output conductor 224 connected to the serial drive circuit H on the floor is driven low. Column 1 drive circuit A includes an inverter 230 and rectifier diodes 232, 234, and 23.
6, semiconductor switching elements 238 and 240 such as NPN transistors, and resistors 242, 244, 24.
6 and 248.

Decoder 88 is connected to inverter 23 by output conductor 210.
The output terminal of inverter 230 is connected to the base b of transistor 238 through a diode 232 (connected with a polarity that conducts current to base b). The DC power supply is represented by terminal 250 and is connected to resistor 24.
2 and transistor 238 through diode 232
is also connected to the base b of. This base b is connected to ground 252 through series connected resistors 244 and 246. The collector c of the transistor 238 is connected to the output terminal F and thus to the column conductor 9 of the hall light and car position matrix 2.
0 and its emitter e is connected to resistors 244 and 24
Connected to connection point 6. This connection point is also connected to the base b of transistor 240. transistor 240
The collector c of is connected to the output terminal F via a resistor 248, and the emitter e thereof is connected to ground 252. Diode 234 has its cathode connected to output terminal F and its anode connected to ground 252;
36 has its cathode c connected to a DC power supply represented by terminal 254, and its anode a connected to output terminal F. Diode 236 clamps the highest voltage that column conductor 90 can rise to. During operation of column 1 drive circuit A, decoder 8
When the output on the output conductor 210 of 8 goes to a low level,
Inverter 230 provides base drive to transistor 238 to turn it on.

Transistor 238 then provides base drive to transistor 240, turning it on. The column conductor 90 of the hall light and car position matrix 72 is therefore connected to the resistor 248 and transistor 2.
Connected to earth via 40. When the output from decoder 88 to column drive circuit A is high, the inverter provides a logic zero value to the base of transistor 238, turning transistor 238 off. This transistor 238 then turns off transistor 240 and the hall lights and associated column conductors of the car position matrix are disconnected from ground. As will be discussed below, the power supply circuit 78 connected to the row drive circuits is limited in the maximum current it will supply and provides a limited rush current through the transistors in the row drive circuits and column drive circuits. Accordingly, the transistors and any other semiconductor switching elements in the row and column drive circuits can be chosen on this basis, significantly reducing the cost of the semiconductor switching elements. The semiconductor switching elements in the power supply circuit 78 are selected to have a significant power dissipation capacity since the voltage drop during lash current conduction when the lamp is energized is very large. However, even if the semiconductor switching elements are selected in this way, economic efficiency is not hindered. This is because the semiconductor switching elements do not have to be chosen to continuously supply current to the shorted load. The power supply circuit 78 is automatically shut down when a load current of a predetermined magnitude persists for a predetermined period of time. Specifically, current limiting and short circuit protection functions are performed by power supply circuit 78, delay circuit 84, and driver inhibit circuit 86. The power supply circuit 78 includes semiconductor switching devices 260, 26 such as transistors.
2,264, 266, 268 and 270, an inverter 272, constant voltage diodes 274 and 276 such as Zener diodes, and a rectifier diode 278,
280 and 282, and resistors 284, 286, 288,
290,292,294,296,298,30030
2,304, 306, 308 and 310. Transistors 260 and 262 (which may be PNP and NPN transistors, respectively) are interconnected between a DC power supply, represented by terminal 80, and output terminal BP.

The base b of transistor 260 is connected to resistors 284 and 2
88 to terminal 80 and also to terminal 80 via Zener diode 274 . The emitter e of the transistor 260 is connected to the terminal 8 via a resistor 288.
Connected to 0. The collector c of the transistor 260 is
It is connected directly to the base b of transistor 262 and to the emitter e of transistor 262 via bias resistor 286. The Zener diode 274, together with the resistance value of the resistor 288,
60 and 262 to provide a predetermined maximum current output to output terminal BP. In other words, Zener diode 274 limits the base drive voltage that can be applied to toranogistor 260. Collector c of transistor 262 is connected to terminal 80 through resistors 290 and 288.
and its emitter e is connected to the output terminal BP. Transistors 264 and 266 (each of which is P
NP transistors (which can be NPN transistors) are interconnected between the DC power supply and the output terminal F in the same way as transistors 260 and 262.

Base drive to transistor 264 is also limited by the voltage at the terminals of Zener diode 274. If a 1N959 Zener diode is used for Zener diode 274 and approximately 20 ohm resistors are used for resistors 288 and 296 in the emitter circuits of transistors 260 and 264, respectively, each pair of transistors will
The maximum current flowing to the terminal is approximately 375mA. The ratings of other Zener diodes and the resistance values of the resistors are, of course,
A different maximum current can be chosen as desired.
The short circuit protection function of the power supply circuit 78 is provided by the transistor 26
8 and 270.

Transistor 268, which may be an NPN transistor, is
Its collector c is connected to Zener diode 274 via resistor 304, its emitter e is connected to ground 312, and its base b is connected to receive a signal from delay circuit 84 through inverter 272 and diode 278. Inverter 272 has input terminal 313
and the anode a of the diode 278. The cathode c of the diode 278 is connected to the base b of the transistor 268.
connected to. The anode of the diode 278 is connected to a resistor 300
to a DC power supply represented by terminal 314. The base b of transistor 268 is connected to bias resistor 302.
is connected to ground 312 via. Transistor 270, which may be an NPN transistor, has its base b connected to ground 312 through resistor 308 and is also connected to the emitter e of transistor 266 through diode 282, Zener diode 276, and diode 280. The diode 282 has its cathode c connected to the base b of the transistor 270, and its cathode a connected to the anode a of the Zener diode 276. The cathode c of the Zener diode 276 is the anode a of the diode 280.
connected to. The cathode c of diode 280 is connected to the emitter e of transistor 266. A connection point between Zener diode 276 and diode 280 is connected to terminal 80 via resistor 306. The collector c of transistor 270 is connected via a resistor 310 to a DC power supply represented as terminal 316 and also to an output terminal 318 that provides a signal to delay circuit 84 . Emitter e of transistor 270 is connected to ground 312. As long as the signal applied from delay circuit 84 to input terminal 313 of power supply circuit 78 is a logic zero, the output of inverter 272 is high and transistor 268 is turned on to connect Zener diode 274 to ground 312 through resistor 304. connection and operate the power supply circuit 78 normally.

When the power supply circuit 78 is operating with a normal load current, the transistor that supplies current to the output terminal BP is saturated and its power consumption is low. zener diode 2
The value of 76 is chosen as follows. That is, when transistors 262 and 266 are supplying normal load current, the voltage at the emitters of these transistors is high enough to exceed the breaker down voltage of the Zener diode, and transistor 270 is turned on to provide a logic value at output terminal 318. 0 signal is supplied. During lamp operation and under short-circuit conditions, the transistor supplying current to output terminal BP is taken out of saturation and its power dissipation increases, bringing the voltage at the emitters of transistors 262 and 266 below the breaker down voltage of Zener diode 276. descend to. Transistor 270 is therefore turned off and the signal at output terminal 318 becomes a logic one indicating a current limit condition. Delay circuit 84 receives this current limit instruction signal and times its duration to distinguish between normal lash current during lamp operation and a short circuit condition. If the large current limit indication signal ceases before delay circuit 84 times out, no protection is provided by delay circuit 84. Delay circuit 84
If the large current limit indication signal continues from power supply circuit 78 until timeout, delay circuit 84 provides a logic one signal to the input terminal of inverter 272 of power supply circuit 78, thereby turning off transistor 268. Moreover, the power supply circuit 78 is stopped. delay circuit 8
4 also excludes shorted loads from power supply circuit 78 by providing a signal to driver inhibit circuit 86 .

To this end, driver inhibit circuit 86 provides a row driver inhibit signal to decoder 82 and removes the position select signal from the row driver. Excluding the shorted load from the power supply circuit 78 includes
The power supply circuit 78 can be brought back to normal to await a change in car position to another floor (which probably does not have a shorted lamp circuit). A single advance car position change resets the driver inhibit circuit 86, thereby reactivating the correct row drive circuit with the position select signal.
Delay circuit 84, shown in block diagram form in FIG. 3, is shown in detail in FIG. 4A.

The delay circuit 84 is a retriggerable monostable multivibrator SN74l2 manufactured by Texas Instruments.
A delay device 330 such as 2 and NAND gates 332 and 33
4, 336 and 338, a cross-coupled NAND gate type flip-flop 340 consisting of NAND gates 342 and 344, inverters 346 and 348, a DC power supply represented by terminal 350, a resistor 352, and a capacitor 354. Terminal 350, resistor 352 and capacitor 354 to monostable multivibrator 330;
Connect and establish the required delay time. The lamp filament heats up and settles to its steady state current within 200 milliseconds. Therefore, the monostable multivibrator and its external timed capacitor and timed resistor can be chosen to provide a 200 millisecond delay before timing out. Unless monostable multivibrator 330 times out, its output terminal o is held low.

If the current limit indication signal persists for more than 200 milliseconds, output terminal Q goes high. The NAND gate 332 has its first input terminal connected to the output terminal 318 of the power supply circuit 78 via an inverter 346, and its second input terminal connected to the output terminal of the NAND gate 344 (this is referred to as the output terminal of the flip-flop 340). , and its third input terminal receives the clock signal S2S.
connected to receive. The output terminal of the NAND gate 332 is the input terminal A1 of the monostable multivibrator 330.
connected to. The NAND gate 334 has its first input terminal connected to receive the clock signal S2S, its second input terminal connected to the output terminal B of the flip-flop 340, and its output terminal connected to the monostable multivibrator 3.
30 input terminal A2.

The NAND gate 336 has its first input terminal connected to the output terminal 318 of the flip-flop 340, its second input terminal connected to the output terminal 318 of the power supply circuit 78, and its third input terminal connected to the output terminal 318 of the monostable multivibrator 330. The output terminal Q is connected to the set input terminal of flip-flop 340, that is, one input terminal of NAND gate 342. NAND gate 338 has its first input terminal connected to output terminal 318 of power supply circuit 78 via inverter 348, its second input terminal connected to output terminal B of flip-flop 340, and its output terminal connected to output terminal B of flip-flop 340. The set input terminal is connected to one input terminal of the NAND gate 344.

Flip-flop 340 has its output terminal B further connected to input terminal 313 of power supply circuit 78 and its output terminal B further connected to one driver inhibit circuit 86.

Driver inhibit circuit 86 includes NAND gates 362 and 36.
4, a cross-coupled NAND gate type flip-flop 360, and inverters 366 and 368.

The set input terminal of flip-flop 360, ie, one input terminal of NAND gate 362, is connected to the output terminal B of flip-flop 340 in delay circuit 84, and the reset input terminal of flip-flop 360, ie, one input terminal of NAND gate Z 364, is connected to output terminal B of flip-flop 340 in delay circuit 84. connected to receive.

This reset signal PCR is the advancing car position signal AVPO.
~Every time AVP6 changes the floor number, it becomes lower level. The set output terminal of flip-flop 360, that is, the output terminal of NAND gate 362, is connected to the AVP4 input terminals of AND gates 195 and 197 via inverter 366, and to the AVP4 input terminal of AND gates 195 and 197 via inverter 368.
It is connected to the AVP4 input terminals of 91 and 193. Therefore, when flip-flop 360 is reset, the row driver inhibit signals from inverters 366 and 368 are at a logic one level and have no effect on circuit operation. However, when flip-flop 360 is set, all AND gates 191, 193, 195 and 197 are inhibited and therefore all row drive circuits are also inhibited. Next, the operation of power supply circuit 78, delay circuit 84, and driver inhibit circuit 86 will be explained.

When the row and column drivers are energized to provide voltage to operate the hall lights and car position lamps, there is no normal rush to the lamps if the car position lamps are included in the matrix. The current is limited by the action of Zener diode 274 in power supply circuit 78, but this rush current is
6 are driven out of saturation to reduce the voltage at their respective emitters below the pre-down voltage of the Zener diode 276. Transistor 270 is therefore cut off and output terminal 318 becomes a logic one. The output of NAND gate 332, which had been toggling high and low at the frequency of clock signal S2S, is now held high due to inverter 346 applying a logic zero to the first input terminal of NAND gate 332. . The seven outputs of flip-flop 340 are at a high level at this time. The high output of NAND gate 332 is monostable multivibrator 3
30 timed intervals, such as the 200 milliseconds mentioned above. If the large current limit indication signal is due to the normal lash current of a cold lamp, the current will settle to a certain value before the monostable multivibrator 330 times out. That is, this value reduces the voltage at the emitters of transistors 262 and 266 to Zener diode 2.
76 to turn on transistor 270 and set a logic 0 to inverter 3.
46. The inverter 346 then applies a logical 1 to the first input terminal of the NAND gate 332, and the NAND gate 332 once again begins switching at the clock signal frequency.
Prevent 0 from timing out. Therefore, a large current limit indication signal at output terminal 318 will not cause any protection by delay circuit 84 as long as it disappears before monostable multivibrator 330 times out. Now suppose that the filament of the connected lamp fails in a short-circuit mode, ie the energized lamp circuit is short-circuited.

The large current limit indication signal at output terminal 318 remains high, causing monostable multivibrator 330 to time out, and the Q output, which was held low, goes high. The total power to NAND gate 336 is now high, the output of NAND gate 336 is low, and flip-flop 340 is set to set its B output to a logic 1.
and changes its L output to logic 0. The B output of flip-flop 340 is connected to input terminal 31 of power supply circuit 78.
3, is inverted by an inverter 272, and is then applied to a transistor 268.
is turned off and the power supply circuit 78 is stopped. High B input to NAND gate 334 is NAND gate 334
The output O of the monostable multivibrator 330 is maintained at a high level by switching the output O at the tarok signal frequency. The L output of flip-flop 340 goes low, setting flip-flop 360 in 1 driver disable circuit 86 to provide a logic 1 to inverters 366 and 368, which invert the logic 0 to all outputs in decoder 82. Supply to ANDGATE. All row drive circuits are then disabled, disconnecting the shorted load from the power supply circuit 78. As soon as this shorted load is disconnected from the power supply circuit 78, the Zener diode 276 is connected to the resistor 306.
, the terminal voltage exceeds the rated pre-breakdown voltage. When the Zener diode 276 breaks down, the transistor 27
0, and the current limit instruction signal becomes a logic 0. When the level at output terminal 318 goes low, NAND gate 338 switches its output to a logic zero value and resets flip-flop 340. Therefore, output B goes low, turning on transistor 268 and starting power supply circuit 78. Output B goes high, enabling flip-flop 360 (Snabl
s) and also enable NAND gate 332. This causes the output of NAND gate 332 to begin switching at the clock signal frequency, causing monostable multivibrator 33
0 output Q is returned to logical value 0. The power supply circuit 78 is thus returned to operation, but with no load connected at this point. When a force changes its advancing car position,
Reset signal PCR goes low to reset flip-flop 360, thereby removing the row driver inhibit signal to the AND gate in decoder 82. Therefore, the entire circuit is brought back to normal when the force advancement car position changes.
The matrix 72 shown in Figure 4B can be used for buildings up to 128 stories when used solely for up and down landing lights, or proportionally reduced when used in conjunction with car position indicators. A new and improved matrix 380 illustrating how it can be expanded is shown in part schematic diagram and part block diagram in FIG.

In FIG. 5, the same parts as in FIGS. 4A and 4B are designated by the same reference numerals. As shown in Figure 5B, the hall light matrix up to the 31st floor is transferred to the matrix shown in Figure 4B.
This can be constructed by adding additional row conductors 382 and 384 and two additional row 1 drive circuits G and H.

Row conductors 106, 108, 110, and 112 are for the 1st to 7th floors, the 8th to 15th floors, the 16th to 23rd floors, and the 24th to 31st floors, respectively.
It is applied to the descending hall light of the floor, but the row conductors 114, 116
, 382, and 384 are applied to the rising hall lights of the 0th to 7th floors, the 8th to 15th floors, the 16th to 23rd floors, and the 24th to 30th floors, respectively. Row drive circuits A and E use position selection signal PSEC
row drive circuits B and F are activated by position selection signal P
SEC1, row drive circuits C and G are operated with position selection signal PSEC2, and row drive circuits D and H are operated with position selection signal PSEC3.

The column driver does not require any changes to its circuitry. The matrix has eight additional row drive circuits N-T and eight additional row conductors I', 108', 11σ, 117, 1
By adding 14', 116', 382' and 384', it can be expanded to 64 floors.

No separate column conductors or column drive circuits are required to extend the matritas up to 64 floors. The position selection signal is applied to the same row drive circuit as described above. The only change required is to replace row drive circuit X-H' with column enable signal AVP5.
It is to operate with. As can be seen from FIG. 2, the column enabling signal AVP5 is for the O to 31st floors, while the column enabling signal AVP5 is for the 32nd to 63rd floors. The number of floors that can be accommodated can be expanded from 64 to 128 by adding eight additional column drive circuits X-H' and decoders 88'.

No separate row 1 drive circuit is required to extend the matrix from the 64th floor to the 128th floor. The only change required is to operate decoder 88' with AVP6 instead of column enable signal AVP6. As can be seen in FIG. 2, the column enable signal AVP6 has only two states for up to floor 128, so one set of column 1 drives when the advancing car position changes from floor 63 to floor 64. It can be conveniently used to switch from one circuit to another set of column drive circuits. Regardless of which set of column drive circuits is activated, the position select signal is also repeated to automatically activate the appropriate row drive circuit. For example, the position selection signal PSECO is for floors 0 to 7.
In addition to activating the floors, floors 64 through 71 associated with the same row conductor 106 of the matrix are activated. Therefore, a total of 7 bits of advancing car position signals AVPO to AVP
6 is utilized to selectively activate the correct rows and columns of the matrix to illuminate the lamps associated with the advancing car position of the car. In summary, a new and improved elevator installation has now been demonstrated that includes a hall light circuit configured to allow economical use of semiconductor switching elements in a current limited and protected manner that ensures a long operating life.

A power supply circuit is provided that limits the rush current to a hall light lamp and causes semiconductor switching elements in a lamp drive circuit to operate at maximum current. Limited power consumption
It also protects the semiconductor switching elements in the event of short-circuit loads. The semiconductor switching elements are selected to withstand rush currents to the lamp, but are protected against short circuit currents that flow for periods longer than about 20 milliseconds as described below.

That is, the power supply circuit is shut down when the load draws a predetermined maximum current for longer than the time required for the rush current to the lamp to settle to a value less than the predetermined maximum value. However, rather than shutting down the entire hall light circuit, the present invention shuts down only the power supply circuit connected to the particular hall circuit containing the shorted load.

As soon as the power supply leaves the floor associated with the short-circuited hall light, the power supply circuit and the drive circuit are returned to the normal state. According to the present invention, a smaller and cheaper solid state switching element can be used in one drive circuit, so that control over a certain range can be performed extremely accurately.

[Brief explanation of the drawing]

Claims (1)

[Claims] 1. An elevator car that is movably mounted in a multi-story building and is placed in service to a floor, and a landing light lamp that is arranged on at least some floors of the building in which the car is placed in service;
A building elevator system equipped with a power supply circuit includes a drive circuit that selectively connects a hall light lamp to the power supply circuit in response to a predetermined action of a car, and the power supply circuit connects the selected hall light lamp to the power supply circuit. means for supplying current and controlling the current supplied to the selected hall light lamp to a predetermined maximum value that is less than the normal rush current of the hall light lamp but greater than the normal operating current of the hall light lamp; Control signal means is included in the power supply circuit and responsive to the current supplied by the power supply circuit, the current limit signal means being configured to control the power supply circuit to supply a predetermined maximum current to the landing lamp. A protection means is further provided for supplying a current limit signal for a period of time and is responsive to said current limit signal, said protection means providing said current limit signal for a period of time greater than the time required to supply normal rush current to the landing lamp. An elevator characterized in that when the current limit signal continues, a stop signal is supplied to fix the normal operating current, and the power supply circuit is responsive to the stop signal to terminate the supply of current to the hall light lamp. Device.