CN1079713A - Elevator control gear - Google Patents

Abstract

The present invention has disclosed a kind of elevator control gear, and it comprises: source of AC is transformed into straight-though changer bridge circuit; Become to exchange, provide inverter bridge this DC converting as the driving power of the elevating motor that makes the lift car lifting; Be arranged on battery and charger thereof between described inverter bridge dc supply input; Detect the power cut detection circuit that described source of AC has a power failure; Be arranged between described changer bridge circuit input end, detection signal, by the interchange that the charging valtage of the described battery of described converter bridge route is regenerated, the power export device of deriving as power supply in the car of elevator according to described power cut detection circuit.

Description

Elevator control gear

The present invention relates to elevator control gear, relate in particular to movable elevator control gear when having a power failure.

The summary of existing elevator device is shown in Fig. 4, among Fig. 4, the 1st, the lifting winch of elevator, the 2nd, the deflector wheel of the elevator wire rope position of staggering, the 3rd, the wirerope of suspention lift car 5 and weight equalizer 7, the 4th, the car guide rail of guiding lift car 5, the 5th, lift car, the 6th, the weight equalizer guide rail of guiding weight equalizer 7, the 7th, weight equalizer.

The summary power-supply system of the existing elevator device of above-mentioned formation is shown in Fig. 5.Among Fig. 5, three-phase input power supply R, S, T input to lifting winch control power converter 9 by circuit breaker 8, by wherein changer three phase mains is transformed into predetermined vdc, again by the inverter of interior dress, the direct supply of conversion is transformed to all variable regulation source of AC of voltage, frequency again, control elevating motor 10, drg 12.The 11st, be used to detect the speed of elevating motor 10 and the coder of elevator car position.

Again, as lift car internal circuit 15, have: door drives with changer 16, passes through the door motor 17 that this changer 16 drives, the coder 18 of detecting gate electrical motor 17 speed and door position, car intraoral illumination 19 etc.Usually, the step-down transformer 13 of power line voltage by being connected to above-mentioned circuit breaker 8 through the elevator cable 14 from the building side, powered to cage side more at last.

, in above-mentioned elevator control gear, elevator supply also interrupts during power failure, and the passenger is closed at floor gap, therefore, as the power failure countermeasure, the general method that is shown in Fig. 6 that adopts.Fig. 6 is the scheme drawing that constant frequency power of isopiestic pressure is set at the elevator control gear input end.But as shown in Figure 6, owing to supply with the required whole electric power of elevator control gear by constant frequency power of isopiestic pressure 20, it is very big that the capacity of constant frequency power of isopiestic pressure 20 becomes, thereby uneconomical, for this reason so adopt the mode that is shown in Fig. 7 and Fig. 8.

At first, be illustrated for Fig. 7.Among Fig. 7, need the elevating motor of big electric power to power when having a power failure by the inverter that the dc voltage conversion of battery 36 is become alternating-current voltage/AC voltage, other car intraoral illumination power supply, door power supply etc. are by constant frequency power of isopiestic pressure 20 power supplies.Among Fig. 7, just often, because contactless switch MC3(coil 28, contact 23), contactless switch MC4(coil 29, contact 41) junction closure, direct supply 32 in the power-converting device 9 or car intraoral illumination, door power supply, by input power supply R, S, T, through contact 41 power supplies of step-down transformer 39A, contactless switch MC4.

Again, the battery 36 in the constant frequency power of isopiestic pressure 20 charges by diode bridge 38, constant current charger 35.35A in the constant current charger 35 is the transistor that usefulness is switched in constant current, and 35B detects the DCCT(DC current transformer that charging current is used), 35C is a current-limiting resistance.

So, when the input power supply has a power failure,, make contactless switch MC3(coil 28 by power cut detection device 27, contact 23), contactless switch MC4(coil 29, contact 41) disconnect, make contactless switch MC5(coil 31, contact 40 simultaneously), contactless switch MC6(coil 30, contact 33) closure.Just often, the action of above-mentioned contactless switch is opposite.

Therefore, during power failure, the voltage of battery 36 is through the contact 33 of discharge diode 37, contactless switch MC6, and the lifting winch in power converter 9 drives and provides vdc with inverter 22.This occasion, output voltage is generally fixed than cell pressure height between the PN of changer 21, during power failure, but usually the elevating motor low-speed running near floor because terminal voltage of motor is very low, the voltage of the battery that needn't raise.

Again, the voltage feed-in transistor bridge circuit 34 of battery 36, the output transform of this bridge circuit becomes the alternating-current voltage/AC voltage of constant voltage constant frequency.Because cell pressure is low,,, supply power to direct supply 32 in the power-converting device 9 or car intraoral illumination, door power supply again through the contact 40 of contactless switch MC5 so the voltage after the conversion boosts to AC100V by step-up transformer 39.

Moreover, among Fig. 7, the 24th, AC reactor; The 25th, the changer received current detects uses DCCT; The 21st, have the transistor converter bridge circuit of power of regeneration, make output voltage (voltage between PN) keep constant, received current is consistent with input voltage phase, and promptly power factor ontrol is 1; 56 to 61 is 6 transistors of transistor formed changer bridge circuit.

Again, Fig. 8 represents the control block diagram that existing elevating motor 10 drives with power-converting device.Among the figure, because of power circuit illustrates in Fig. 7, so omitted.Below, the action of simple declaration Fig. 8 block diagram.According to lifting or halt instruction, in position control section 47, according to the output of coder 11, the surplus that proceeds to predetermined floor detects, and according to this surplus, is produced the speed command of elevator by the speed command generating unit of interior dress.The speed command that produces is counted the pulse train of coder 11, and its result subtracts each other with the present speed of speed test section 46 gained of calculating present speed in subtracter 47A, thus the deviation of calculating and speed command.

The velocity deviation that calculates after compensating computing in velocity-variation amplifier 45, amplifying, produces torque instruction T.Torque instruction calculates in vector calculus portion 44, and produce excitation branch current i d, torque divides current i q, instruct as motor current.In current control division 43, according to motor current instruction id, iq, by being included in the PWM control part (pulse-width modulation circuit) in the current control division 43, control inverter bridge circuit 22, thereby control motor terminal voltage are so that actual motor current I _R, I _S, I _TFlow.

On the other hand, in convertor controls portion 42, by the virtual voltage V between a PN of output _DCWith reference voltage V _DcrefRelatively, make converter voltage keep certain, simultaneously, make received current I _R, I _S, I _TConsistent with input voltage phase, promptly input power factor is controlled to be 1, said reference voltage V _DcrefEqual the voltage instruction value that the converter voltage instruction is produced, be generally constant.Again, converter voltage V _DCThan voltage instruction value V _DcrefWhen high, changer bridge circuit 21 is controlled, and makes this bridge circuit play the regeneration changer.

As mentioned above, in existing elevator control gear, prevent that the passenger is in closed condition in order to have a power failure, as shown in Figure 7, must use the power-converting device 9 except that the driving of elevating motor 10, the constant frequency power of isopiestic pressure 20 that also has charged pool 36 is as a car intraoral illumination and a door driving power supply.

The present invention is in view of above-mentioned deficiency, it is a kind of when power failure provides the driving power of cab interior circuit that its purpose is to provide, needn't have special constant frequency power of isopiestic pressure, utilize original elevating motor to drive and use power-converting device, the elevator control gear of the uninterrupted control of just powering.

Relating to elevator control gear of the present invention has: source of AC is transformed into straight-though changer bridge circuit; Become to exchange, provide inverter bridge this DC converting as the driving power of the elevating motor that makes the lift car lifting; Be arranged on battery and charger thereof between this inverter bridge dc supply input; Detect the power cut detection circuit that above-mentioned source of AC has a power failure; Be arranged between above-mentioned changer bridge circuit input end, the interchange of the charging valtage regeneration by the described battery of described converter bridge route, the power export device of being derived as the lift car internal electric source detection signal according to above-mentioned power cut detection circuit.

In the present invention, when detecting the source of AC power failure by power cut detection circuit, the vdc of battery is made exchange conversion by the changer bridge circuit, through let-off gear(stand), this alternating-current voltage/AC voltage is derived as the cab interior power supply, thus, also can guarantee the cab interior power supply during power failure.

Fig. 1 is the power circuit block diagram of one embodiment of the invention.

Fig. 2 is the control block diagram of one embodiment of the invention.

Fig. 3 is a control program composition diagram of the present invention.

Fig. 4 is the composition diagram of elevator device.

Fig. 5 is the power-supply system block diagram of common elevator device.

Fig. 6 is the composition diagram that constant frequency power of isopiestic pressure is inserted common elevator device main power source input end.

Fig. 7 is the power circuit block diagram that power interruption compensation circuit is set in the existing elevator control circuit.

Fig. 8 is the control block diagram of existing elevator.

Below, according to Fig. 1 to Fig. 3 embodiments of the invention are described.

Embodiment shown in Figure 1, from the elevator control gear that is shown in Fig. 7, remove AC100V constant frequency power of isopiestic pressure 20, battery charger 35 and battery 36 are set between the power output end PN of the changer bridge circuit 21 in power-converting device 9, provide input by battery 36 for inverter control power supply DC-DC changer 55, simultaneously, when having a power failure, make exchange conversion by the vdc of 21 pairs of batteries 36 of changer bridge circuit, and, this alternating-current voltage/AC voltage is used as the cab interior power supply through voltage transformer 54.

In being shown in the composition of Fig. 1, because three-phase input power supply RST is identical with the existing mode that is shown in Fig. 7 in the fashionable action of normal field, so omit its explanation here.When three-phase input power supply RST takes place to have a power failure, detect power failure by power cut detection circuit 27, owing to be the auxiliary contact 53 of unlatching when when contactless switch MC1(excitation coil 50, main contact 51, excitation be closed auxiliary contact 52, excitation) coil 50 not by excitation, so contact 51,52 is opened contact 53 closures.

Voltage transformer 54 is just often as the step-down transformer work from AC200V/220V to 100V; Conduct boosts to the step-up transformer work of 100V during power failure.Need this step-up transformer to be because if the voltage height of battery 36, then this battery 36 becomes very huge, so cell pressure is lower than the voltage between converter voltage mouth PN usually.Again, as mentioned above, during owing to power failure, near floor, it is very low that terminal voltage of motor becomes, so the cell pressure that needn't raise with low-speed running for elevating motor usually.

And, during power failure,, make 4 transistors, 56,58,59,61 actions in the changer bridge circuit 21 because cell pressure gives the changer bridge circuit 21 power supplies by discharge diode 37, between R1, the T1 of changer bridge circuit, produce the constant voltage constant frequency PWM alternating-current voltage/AC voltage of regulation.By the constant voltage constant frequency PWM alternating-current voltage/AC voltage of changer bridge circuit 21 regeneration,, become the AC100V electric consumption on lighting source of using by step-up transformer 54 at aspects such as car intraoral illuminations by AC reactor 24 and contact 53.This occasion uses that the AC reactor 24 as necessary element plays the smooth transformation device bridge circuit 21 constant voltage constant frequency PWM alternating-current voltage/AC voltages that produce in the transistorized changer bridge circuit.

Again, Fig. 2 is in order to carry out above-mentioned present embodiment action, with respect to existing control block diagram Fig. 8, and an embodiment of the change-over switch 57 when adding, electric voltage frequency benchmark 56A, constant voltage constant frequency control part 56 just often with power failure.During power failure, in constant voltage constant frequency control part 56, control by feedback voltage R2, T2 and the electric voltage frequency benchmark 56A that relatively exports, making voltage, the frequency of R2, T2 is predetermined value.

At this moment,, make 4 transistors, 56,58,59,61 actions of changer bridge circuit 21, carry out the PWM(pulse duration modulation because change-over switch 57 switches to constant voltage constant frequency control part 56) control.

Because the convertor controls portion of above explanation etc. turn round by the software of common microcomputer etc., control power supply 55 carries out work with the vdc of battery 36 again, so can constitute the program that is shown in Fig. 3.That is, just often, can make control program 71 actions,, input power factor is controlled to 1 so that the output voltage of changer bridge circuit 21 is controlled to steady state value; During power failure, control program 71 actions needn't be made, thereby 52 actions of constant frequency power of isopiestic pressure program can be made.

The program of above-mentioned Fig. 3 must make its action in each predetermined sample period usually, even but increase constant frequency power of isopiestic pressure control program 52 as mentioned above, the processing time is also constant, thereby this mode is not difficult to enroll in original system.

Though in the above description, the constant frequency power of isopiestic pressure that produces when having a power failure, the output that also can easily produce three-phase, 200V level are described with single-phase 100V again.Again, though illustrate with transistor and also can constitute on-off element in the converter bridge road 21, inverter bridge 22 with other elements such as GOT, IGBT.

As mentioned above, the present invention is constructed as follows: when power cut detection circuit detects the source of AC power failure, by the changer bridge circuit vdc of battery is made exchange conversion, derive this interchange as the cab interior power supply through let-off gear(stand), because only by increasing battery, utilize original elevating motor to drive and just can obtain the elevator control gear of compensation that has a power failure, thereby seek the raising of economic effects and reliability easily with power-converting device.

Claims (1)

1, a kind of elevator control gear is characterized in that comprising: source of AC is transformed into straight-though changer bridge circuit; Become to exchange, provide inverter bridge this DC converting as the driving power of the elevating motor that makes the lift car lifting; Be arranged on battery and charger thereof between described inverter bridge dc supply input; Detect the power cut detection circuit that described source of AC has a power failure; Be arranged between described changer bridge circuit input end,, by the interchange that the charging valtage of the described battery of described converter bridge route is regenerated, the power export device of deriving as power supply in the car of elevator detection signal according to described power cut detection circuit.

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