KR910006668Y1 - Saving device of elevator in interruption of electric power - Google Patents

Abstract

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Description

Automatic rescue operation device in case of power failure of elevator

1 is a block diagram of a conventional automatic rescue operation apparatus in case of power failure.

2 is a detailed circuit diagram of the battery low voltage detector of FIG.

3 is a conventional safety detection relay drive circuit diagram.

4 is an acceleration completion detection circuit according to the present invention.

5 is a safety detection relay drive circuit diagram according to the present invention.

6 is a discharge curve of the battery.

* Explanation of symbols for main parts of the drawings

1: DC drive motor 2: Battery low voltage detector

3: DC drive motor driving and braking unit 4: power conversion unit

5: control power supply unit 6: control unit

13: buffer 14: comparator

15: absolute amplifier OP ₁ , OP ₁₁ : comparator

BAT: Battery D: Relay for detecting battery low voltage

SR: Acceleration completion detection relay C: Safety detection relay

TM ₁ : Start timer contact

The present invention relates to an automatic rescue operation device in case of a power failure of an elevator, and in particular, an automatic rescue in case of a power failure of an elevator, which makes it possible to effectively perform an automatic rescue operation by preventing the battery low voltage detection relay from being driven by the starting current during acceleration. It relates to a driving device.

As shown in FIG. 1, the automatic rescue operation apparatus in the case of a power failure of the conventional DC drive motor connected to the battery low voltage detection unit 2 is connected to the battery low voltage detection unit 2 as an emergency power source. It is connected to the main brush 1a of the DC drive motor 1 through the driving and braking section 3, and the output side of the battery BAT detects the low voltage of the power converter 4 and the battery low voltage detector 2. Tolerance safety detection relay contact (C _b ), a control power supply unit 5 is connected to the control unit 6, the sensor brush (1b) of the DC drive motor 1 is the control unit (7) through the load detection unit (7). 6 is a sheave, 9 is a cage, 10 is a weight, 11 is a field, and 12 is a brake.

In addition, as shown in FIG. 2, the battery low voltage detection unit 2 is connected to the resistor R ₂ through the resistor R _{1 while} the output side of the battery BAT is connected to the resistor R ₃ again. It is connected to the inverting input terminal of the comparator OP ₁ , the power supply terminal V _cc is connected to the variable resistor VR ₁ through the resistor R ₄ , and the comparator OP ₁ through the resistor R ₅ again. ) for being connected to the non-inverting input terminal, of the comparator (OP _1), the transistor (TR ₁₎ output the resistance (R ₆₎ through a resistance (R _7), and Battery low voltage detection relay (D) is connected to the collector of It is connected to the base and configured.

Then, the contact of the low voltage detection relay (D) (D _a) is a third degree a is connected to the safety detection relay (C) as described, the safety detection relay (C) whose contacts when driven (C _b shown in ) Is supposed to open.

In the conventional apparatus configured as described above, the battery BAT, which is an emergency power source, is used as the driving power source when the power failure is performed and the automatic rescue operation is performed. On the other hand, at the beginning of the rescue operation, a constant field current is applied to the field MF, the brake 12 is released for a predetermined time, the load detection unit 7 determines the load state in the gauge 9, and then the brake 12 is again applied. Close and enter auto rescue operation. At this time, until the DC drive motor 1 reaches the reference speed in the automatic rescue operation in the stopped state, the pillar current flows several times larger than the rated current during the automatic rescue operation. Current will flow.

On the other hand, when the brake 12 is opened, the most torque is required to operate at the reference speed required for the automatic rescue operation in an equilibrium state where there is almost no weight difference between the cage 9 side and the weight 10 side. The rated capacity of the battery (BAT) is set in consideration of the required current of. That is, in Fig. 6, the discharge curve 1c (where c is the rated current) is set to set the battery low voltage detection voltage to V _R , and the current is 4-6 times the rated current when the DC drive motor 1 is started. If is passed, that is, it is assumed that the discharge to the discharge curve 5c, the actual capacity of the battery (BAT) can be used up to the point (Q) when discharged to the discharge curve 5c, that is, the point that becomes the discharge end voltage (V ₀ ) It becomes possible to use until Q), but the use time becomes t ₁ , but the high potential signal is output from the comparator OP ₁ at the moment when the voltage of the battery V _b falls below the point P. That is, when the battery low voltage detection voltage VS ₂ set by the resistor R ₄ and the variable resistor VR ₁ is set to V _R , the resistor R ₂ is set by the output voltage V _b of the battery BAT. When the voltage VS ₁ applied to the voltage becomes lower than the battery low voltage detection voltage VS ₂ , the high potential signal is output from the comparator OP ₁ , and the high potential signal is transmitted through the resistor R ₆ . _{Since 1} ) is turned on, the battery low voltage detection relay D is driven.

Thus, when the battery low voltage detection relay (D) is driven and its contact (D _a ) is shorted, the safety detection relay (C) is driven to open the contact (C _b ) so that the input power is cut off to the control power supply unit (5). The control power is not applied to the control unit 6, and accordingly, the driving and braking unit 3 of the DC driving motor is not driven so that the rescue operation is not performed.

However, in such a conventional apparatus, since the battery undervoltage detection voltage is set based on the discharge end voltage and the discharge time of the battery when the rated current flows during the automatic rescue operation, the starting current is 4-6 times higher than the rated current during acceleration. When the battery flows in a short time, the battery low voltage detection relay is driven even though the capacity of the battery is sufficient, and the safety detection relay is driven by the battery low voltage detection relay to cut off the power supply to the control power supply unit, thereby automatically saving operation. There was a defect that could not be carried out.

In order to solve the above-mentioned drawbacks, the present invention is designed to use the discharge characteristics of the battery as much as possible without shortening the life of the battery by using it longer than the time to reach the discharge end voltage at the rated current. When described in detail with reference to the accompanying drawings as follows.

4 is a schematic diagram of an accelerated raw material detection circuit according to the present invention. As shown therein, the sensor brush 1 _b of the DC drive motor 1 is connected to the bidirectional capacitor SC, and the buffer 13 and the comparator ( 14), the absolute amplifier 15, the resistor (R ₁₁ ) is connected to the non-inverting input terminal of the comparator (OP ₁₁ ), the power supply terminal (V _cc ) through the resistor (R ₁₂ ) variable resistor (VR ₁₁ ) a junction box and addition back through a resistor (R ₁₃₎ and connected to the inverting input terminal of the comparator (OP _11), a comparator (OP ₁₁₎ the output resistance (R ₁₅₎ via a resistor (R ₁₄₎ a, and the configuration connected to the base of the transistor (TR ₁₁₎ accelerate completion detecting relay (SR) is connected to the collector.

On the other hand, the driving circuit of the safety detection relay (C), as shown in Figure 5, the contact SR _a of the acceleration completion detection relay SR to the contact of the relay (D) (D _a ) is connected to the safety detection relay (C), and the start timer contact (TM ₁ ) is connected to the contact point SR _a of the acceleration completion detection relay (SR), and configured as described above, The effect will be described in detail as follows.

In the DC lift configured as shown in FIG. 1, the weight 10 is set to be equal to the sum of the weight corresponding to 50% of the garden to the weight of the cage 9. Therefore, the capacity of the battery (BAT), which is an emergency power source for automatic rescue operation in case of power failure, is similar to the weight of the cage (9) side and the weight (10) side, leading to the required speed in the automatic rescue operation in a balanced state. It should be set up to provide the energy needed to raise it.

On the other hand, assuming that the discharge curve 1c of FIG. 6 is taken as the current required for driving in the equilibrium state as described above, the discharge end voltage (V _R ) for the protection of the battery BAT when driving the load with the discharge curve 1c. In the following, the use of the battery (BAT) should be prohibited for a predetermined time (t ₂ ).

Of course, assuming that the time t ₂ when using the rated current at the discharge curve 1c is 60 minutes, the discharge time at the load (discharge curve of 0.1c) that uses only 10% of the rated current is t ₃ . It can be used for 10-20 hours, which is 10-20 times the time t ₂ , and conversely, the discharge time at a load (discharge curve of 10c) requiring a current about 10 times the rated current is t ₁ , and the time ( It can only be used for 6-12 minutes, which is 0.1-0.2 times t ₂ ).

Here, the change of time is changed to a logarithmic function.

As described above, when the capacity of the battery BAT is before the rescue operation is performed by driving the DC drive motor 1 in a state where automatic rescue operation is possible in the event of power failure, the battery BAT is described as in the description of FIG. Since the voltage VS ₁ by the output voltage V _b of the voltage is higher than the voltage VS ₂ set as the battery low voltage detection voltage V _R by the resistor R ₄ and the variable resistor VR ₁ . Since the low potential signal is output from the OP ₁ , the transistor TR ₁ is turned off. Accordingly, the battery low voltage detection relay D is not driven, and thus the contact D _a remains open. C) is also not driven so that its contact C _b is kept short.

At this time, since the DC drive motor 1 is not rotated and no voltage is generated in the brush 1b for the sensor, the voltage applied to the non-inverting input terminal side of the comparator OP ₁₁ becomes 0, and the low potential signal is outputted to the output side thereof. Is outputted so that the transistor TR ₁₁ is turned off, and accordingly, the acceleration completion detection relay SR is not driven so that its contact SR _a remains open.

Therefore, at this time, the output voltage V _b of the battery BAT is received by the power converter 4 and applied to the control power supply 5 through the contact C _b of the safety detection relay C, and accordingly the control power supply Since the control power is output from (5) and applied to the control unit 6, it is possible to control the driving and braking unit 3 of the DC drive motor by the control of the control unit 6.

In this state, when the field current is applied to the field 11 and the brake 12 is opened to perform the automatic rescue operation, the starting current of the initial start of the DC drive motor 1 follows the discharge curve 5c in FIG. In this case, the discharge end voltage when the starting current of the discharge curve 5c flows at the instant of the set time (t ₁ ) of the start timer is lower than the battery low voltage detection voltage (V _R ), but the discharge end voltage at the discharge curve 5c. It is higher than (V ₀ ) so that there is no problem in the battery (BAT).

However, when the time to complete the acceleration, that is, the time when the acceleration completion detection relay SR is driven is longer than the set time t ₁ of the start timer, the discharge end voltage V ₀ at the discharge curve 5c is lowered. It will have a fatal effect on the life of the battery (BAT).

Therefore, in this case, the connection point voltage VS ₁ of the resistors R ₁ and R ₂ is equal to or lower than the discharge end voltage V _R according to the output voltage V _b of the battery BAT and thus the comparator OP _1. A high potential signal is outputted, and the high potential signal turns on the transistor TR ₁ through a resistor R ₆ , so that the battery low voltage detection relay D is driven to short-circuit its contact C. At this time, since the start timer contact TM ₁ is short-circuited, the safety detection relay C is driven to open the contact C _b , thereby stopping the automatic rescue operation.

However, if the acceleration is completed within the set time t ₁ of the starting timer at the start, the start timer contact TM ₁ remains open and accelerates before the acceleration is completed and the automatic rescue operation reference speed is reached. Since the completion detection relay SR is not driven and its contact SR _a is kept open, the safety detection relay is operated even when the battery low voltage detection relay D is driven and its contact D _a is shorted. (C) is not driven.

That is, a voltage proportional to the rotation of the DC drive motor 1 is generated in the sensor brush 1b at the time of acceleration driving and charged in the capacitor SC, and the charging voltage of the capacitor SC is stored in the buffer 13 and the comparator. 14 is applied to the non-inverting input terminal side of the comparator OP ₁₁ through the absolute amplifier 15, but is applied to the non-inverting input terminal side of the comparator OP ₁₁ before reaching the automatic rescue operation reference speed. Since the acceleration completion reference voltage V _Q by the resistor R ₁₂ and the variable resistor VR ₁₁ is set higher than the voltage, the low potential signal is output from the comparator OP ₁₁ so that the transistor TR ₁₁ is turned off. Accordingly, the acceleration completion detection relay SR is not driven so that its contact SR _a remains open, and within the set time t ₁ of the start timer, the start timer contact TM ₁ is closed. Retaining battery low voltage detection relay as above Even if this D is driven, the safety detection relay C is not driven so that its contact C _b remains shorted. Therefore, the automatic rescue operation at the time of power failure is continued.

Then, the acceleration when the completion is reached, the rescue operation based on the speed comparator (OP ₁₁₎ the non-inverting input the voltage applied to the terminal is higher than the acceleration complete reference voltage (V _Q) the comparator (OP ₁₁₎ a high potential signal at the The high potential signal turns on the transistor TR ₁₁ , so that the acceleration completion detection relay SR is driven to short the contact SR _a .

However, at this time, since the rated current flows instead of the starting current, the discharge of the battery BAT follows the discharge curve 1c of FIG. 6, and accordingly, the voltage applied to the inverting input terminal of the comparator OP ₁₁ until the time t ₂ . Since the discharge end voltage V _R is higher than the discharge end voltage V _R , a low potential signal is output to the output terminal thereof, and the low potential signal turns off the transistor TR ₁ so that the battery low voltage detection relay D is not driven.

As a result, when the acceleration is completed, the battery low voltage detection relay D is not driven so that its contact point D _a is kept open, and thus the safety detection relay C is not driven. _b ) will remain short-circuited to perform normal rescue operation. In this way, the normal rescue operation can be performed at the time t ₂ until the discharge end voltage V _R of the discharge curve 1c of the battery BAT is reached, and then the time t ₂ is reached and the battery low voltage is reached. When the detection relay D is driven to short the contact D _a , the acceleration completion detection relay SR is driven and the contact SR _a is shorted, so the safety detection relay C is driven to The contact C _b is opened, and accordingly the input power of the control power supply 5 is interrupted to stop the rescue operation.

On the other hand, when the starting current flows until the usable time due to the starting current has elapsed in the state where the acceleration completion is not reached, the starting timer contact TM ₁ is shorted, and the battery low voltage detection relay D is driven. Since the contact (D _a ) is short-circuited, the safety detection relay (C) is driven to stop the rescue operation. Accordingly, the battery (BAT) can be protected by preventing the battery (BAT) from being over discharged. .

As described in detail above, the present invention enables the rescue operation to be performed until the discharge termination voltage at the rated current is reached at the time of starting, so that the battery is discharged without shortening the life of the battery. The characteristics can be utilized to the maximum, and thus there is an advantage that the rescue operation can be performed at the time of power failure until the low voltage of the battery is detected by the rated current without increasing the capacity of the battery.

Claims (1)

Soon as the output side of the batteries (BAT) connected to Battery low voltage detector (2) as well as the power conversion unit 4 and the safety detecting a DC drive motor through a contact (C _b), the control power supply section (6) of the relay (C) driving and In the automatic power failure operation apparatus of the elevator connected to the control part 6 which controls the brake part 3, the sensor brush 1b of the DC drive motor 1 is connected to the bidirectional condenser SC, and In addition, it is connected to the non-inverting input terminal side of the comparator OP ₁₁ to which the acceleration completion reference voltage V _Q is applied to the inverting input terminal side through the buffer 13, the comparator 14 and the absolute amplifier 15, and outputs the same. The terminal is connected to the base side of the transistor TR ₁₁ connected to the collector and the acceleration completion detection relay SR, and the contact SR _a of the acceleration completion detection relay SR is parallel to the start timer contact TM ₁ . After connecting, connect the connection point of the battery low voltage detection relay (D) Automatic rescue operation apparatus in case of power failure of the elevator, characterized in that configured to connect to the safety detection relay (C) through the point (D _a ).