Construction elevator frequency converter brake power supply system and control method

Abstract

The application relates to a novel construction hoist frequency converter brake holding power supply system and a control method, which comprises a power supply circuit and a brake holding power detection circuit; an input port of the power supply circuit is connected with a three-phase power supply; an output port of the power supply circuit is used as a motor brake holding power supply interface; the output port of the power supply circuit is connected with an input port of the brake holding power detection circuit; the power supply circuit comprises a transformer, an air circuit breaker, a relay and a first rectifier circuit; an input port of the transformer is connected with the three-phase power supply; a first output port of the transformer is connected with a first air circuit breaker switch and a first group of relay switches in sequence and then connected with a first input port of the rectifier circuit after being connected in series, and a second output port of the transformer is connected with a second input port of the rectifier circuit; an output port of the rectifier circuit is connected with a second group of relay switches in series and then used as the motor brake holding power supply interface. The application is used for safe power supply and detection feedback circuit of the motor brake holding, so as to control normal operation of the construction hoist.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electronic circuits, in particular to a construction elevator frequency converter brake holding power supply system and control method. BACKGROUND

[0002] Today's frequency converter has been widely used in construction elevators, and its excellent electrical performance is increasingly recognized by the majority of users. Construction elevator frequency converters have developed towards miniaturization and functional integration. From the original single frequency converter, it has developed into a multifunctional frequency converter integrated machine integrating position protection, lifting capacity limitation, fingerprint face recognition, automatic leveling, etc. It greatly simplifies the frequency converter peripheral circuit and volume, reduces the volume of the original control electrical box, and reduces the cost, facilitating customer production, installation and equipment maintenance.

[0003] Construction elevators belong to special industries, and industry safety regulations also have high requirements for the safety and reliability of equipment. The brake holding power supply system of the elevator hoisting motor is a very important functional link system, and the action timing of the brake will directly affect the safety and reliability of the elevator.

[0004] When the elevator is in normal state, when the elevator hoisting motor starts to work, the motor brake must be powered off to release. When the elevator hoisting motor is not working, the motor brake is powered to engage and hold the motor shaft to prevent the elevator from sliding or sliding.

[0005] The elevator hoisting motor may have the following faults:

[0006] Fault state 1: When the motor is working, the brake is not powered off due to circuit reasons, which will cause the motor load to increase, on the one hand, causing the motor to heat up and damage the motor insulation, and on the other hand, causing the brake pad to wear out and damage the brake.

[0007] Fault state 2: When the motor is not working, the brake is powered off due to circuit reasons, which will cause the elevator to malfunction and slide, eventually causing a safety accident

[0008] Therefore, these two fault states are unacceptable I-level faults and must be detected. SUMMARY

[0009] In view of the deficiencies of the prior art, the present application discloses a construction elevator frequency converter brake holding power supply system and control method.

[0010] The technical solution adopted by the present application is as follows:

[0011] The application discloses a novel construction hoist frequency converter brake holding power supply system, which comprises a power supply circuit and a brake holding power detection circuit; an input port of the power supply circuit is connected with a three-phase power supply; an output port of the power supply circuit is used as a motor brake holding power supply interface; the output port of the power supply circuit is connected with an input port of the brake holding power detection circuit; the power supply circuit comprises a transformer, an air circuit breaker, a relay and a first rectifier circuit; an input port of the transformer is connected with the three-phase power supply; a first output port of the transformer is connected with a first air circuit breaker switch and a first group of relay switches in sequence and then connected with a first input port of the first rectifier circuit after being connected in series, and a second output port of the transformer is connected with a second input port of the first rectifier circuit; an output port of the first rectifier circuit is connected with a second group of relay switches in sequence and then used as the motor brake holding power supply interface.

[0012] Further, the brake holding power detection circuit comprises a second rectifier circuit, a current limiting circuit, a voltage dividing circuit and an isolation circuit; an input port of the second rectifier circuit is connected with an output port of the power supply circuit; a first output port of the second rectifier circuit is connected with a first end of the current limiting circuit, a second end of the current limiting circuit is connected with a first end of the voltage dividing circuit, a second end of the voltage dividing circuit is connected with a first input port of the isolation circuit, and a second output port of the second rectifier circuit is connected with a second input port of the isolation circuit; an output port of the isolation circuit outputs a detection signal.

[0013] Further, the second rectifier circuit is a bridge rectifier circuit.

[0014] Further, the current limiting circuit comprises three groups of parallel circuits; the first group of parallel circuits comprises a first resistor, a second resistor and a third resistor which are connected in parallel with each other; the second group of parallel circuits comprises a fourth resistor, a fifth resistor and a sixth resistor which are connected in parallel with each other; the third group of parallel circuits comprises a seventh resistor, an eighth resistor and a ninth resistor which are connected in parallel with each other; the first group of parallel circuits, the second group of parallel circuits and the third group of parallel circuits are connected in series to form the current limiting circuit.

[0015] Further, the voltage dividing circuit comprises a tenth resistor and an eleventh resistor which are connected in parallel with each other.

[0016] Further, the isolation circuit comprises an optical coupler.

[0017] Further, a DC support capacitor is connected in parallel between the second end of the current limiting circuit and the second output port of the second rectifier circuit.

[0018] Further, a TVS tube is connected in parallel with the output port of the isolation circuit.

[0019] Further technical solutions are: a signal indicator lamp is connected in series between the first input end of the isolation circuit and the second end of the voltage dividing circuit.

[0020] A control method of the novel construction hoist variable frequency converter brake holding power supply system, comprising:

[0021] When any one of the first air circuit breaker switch, the first relay switch, the second relay switch and the third relay switch has contact sticking, break other contacts;

[0022] When any one of the first air circuit breaker switch, the first relay switch, the second relay switch and the third relay switch has a fault open circuit, the brake holding power supply detection circuit detects no brake holding power supply signal, the output end of the isolation circuit outputs a low level signal to the central control MCU, the central control MCU cuts off the motor operation instruction, and simultaneously cuts off the brake holding opening instruction to prevent the motor from wearing the brake pad;

[0023] When the rear end circuit of the first air circuit breaker switch has a short circuit, the first air circuit breaker switch is controlled to open to break the rear end circuit, and simultaneously the second air circuit breaker switch breaks the +24V power supply of the central control MCU, and the motor will lose the running signal and stop running;

[0024] When the central control MCU does not issue a motor operation instruction, and the brake holding power supply detection circuit detects a brake holding power supply signal, that is, the central control MCU obtains a high level signal, at this time, the first relay switch, the second relay switch and the third relay switch are all disconnected, and the brake holding power supply is cut off to prevent the brake holding from being loosened to cause the hoist to slide and cause a safety accident.

[0025] The beneficial effects of the present application are as follows:

[0026] The present application discloses a high-reliability brake holding power supply system and brake holding power supply detection circuit, which is used for safe power supply and detection feedback circuit of the motor brake, so as to control the normal operation of the construction hoist.

[0027] The present application can detect and process multiple faults related to the brake holding power supply system, for example, multiple contacts in the power supply circuit are stuck, multiple contacts in the power supply circuit are open, part of the circuit structure in the power supply circuit is short-circuited, the brake holding power supply is wrong, etc., which has strong practicability. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 The present application is a circuit structure schematic diagram. DETAILED DESCRIPTION

[0029] The specific embodiment of the present application will be described below in conjunction with the drawings.

[0030] Figure 1The figure is a schematic diagram of the circuit structure of the present application. As shown in the figure, the power supply system comprises a power supply circuit and a brake clutch power detection circuit. Figure 1

[0031] The input port of the power supply circuit is connected to a three-phase power supply. Specifically, the power supply circuit takes power from the L1 and L3 phases of a 380V AC three-phase power supply. The output port of the power supply circuit serves as a motor brake clutch power interface. The input port of the brake clutch power detection circuit is connected to the output port of the power supply circuit.

[0032] The power supply circuit comprises a transformer T1, a first air circuit breaker switch QF1-1, a relay, and a first rectifier circuit BR1.

[0033] The transformer T1 converts 380V AC power into 220V AC power. The input port of the transformer T1 is connected to the L1 and L3 phases of a three-phase power supply. The first output port of the transformer T1 is connected to the first input port of the first rectifier circuit BR1 after being connected in series with the first air circuit breaker switch QF1-1 and the first group of relay switches. The second output port of the transformer T1 is connected to the second input port of the first rectifier circuit BR1. The output port of the first rectifier circuit BR1 is connected in series with the second group of relay switches, serving as a motor brake clutch power interface.

[0034] In this embodiment, the first group of relay switches comprises the first relay switch K1 and the second relay switch K2 connected in series, and the second group of relay switches comprises the third relay switch KM1.

[0035] The first rectifier circuit BR1 is used for AC-DC rectification. After rectification, the first rectifier circuit BR1 outputs a direct current voltage of 195V, serving as a brake clutch power supply.

[0036] The brake clutch power detection circuit comprises a second rectifier circuit, a current limiting circuit, a voltage dividing circuit, and an isolation circuit. The input port of the second rectifier circuit is connected to the output port of the power supply circuit. The first output port of the second rectifier circuit is connected to the first end of the current limiting circuit, the second end of the current limiting circuit is connected to the first end of the voltage dividing circuit, the second end of the voltage dividing circuit is connected to the first input port of the isolation circuit, and the second output port of the second rectifier circuit is connected to the second input port of the isolation circuit. The output port of the isolation circuit outputs a detection signal.

[0037] Specifically, the second rectifier circuit comprises a bridge rectifier circuit formed by the first diode D1, the second diode D2, the third diode D3, and the fourth diode D4, used to prevent reverse current at the output port of the power supply circuit.

[0038] ​The current limiting circuit comprises three groups of parallel circuits. The first group of parallel circuits comprises a first resistor R1, a second resistor R2 and a third resistor R3 connected in parallel with each other. The second group of parallel circuits comprises a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6 connected in parallel with each other. The third group of parallel circuits comprises a seventh resistor R7, an eighth resistor R8 and a ninth resistor R9 connected in parallel with each other. The first group of parallel circuits, the second group of parallel circuits and the third group of parallel circuits are connected in series to form the current limiting circuit. The current limiting circuit is used to limit the current of the power supply detection circuit. The current limiting circuit is composed of multiple resistors, and the current limiting range can be adjusted.

[0039] Further, a DC support capacitor is connected in parallel between the second end of the current limiting circuit and the second output end of the second rectifier circuit, and specifically comprises a first capacitor EC1 and a second capacitor EC2 connected in parallel with each other, which is used to improve the circuit fluctuation and maintain the stability of the output.

[0040] The voltage dividing circuit comprises a tenth resistor R10 and an eleventh resistor R11 connected in parallel with each other. The voltage dividing circuit divides the 195V DC voltage at the input port of the holding brake power supply detection circuit.

[0041] The isolation circuit comprises an optical coupler ISO1. A TVS (TRANSIENT VOLTAGE SUPPRESSOR) tube EDS1 is connected in parallel at the output port of the optical coupler ISO1 as an anti-static tube. Further, a signal indicator lamp LED1 can be connected in series between the first input end of the isolation circuit and the second end of the voltage dividing circuit, which is used to visually indicate the on-off of the holding brake circuit power supply detection circuit.

[0042] The output port of the holding brake power supply detection circuit outputs a detection signal. Whether the power supply circuit is running normally is reflected by the detection signal. The detection signal output by the holding brake power supply detection circuit is generally a high-low level, and the corresponding fault is judged by the change of the high-low level.

[0043] In actual application, the detection signal can be input to the central control MCU. The central control MCU is a MCU provided with a general IO port, which can receive high-low level signals and output high-low level signals. As shown in the embodiment, the detection signal is input to the port PA1 of the central control MCU. Figure 1

[0044] In Figure 1 ​The shown embodiment works normally, the first air circuit breaker switch QF1-1 is closed, when the external sends the brake motor operation instruction, the power supply circuit of each relay coil is electrified, the first relay switch K1, the second relay switch K2, the third relay switch KM1 are all closed, the output port of the power supply circuit is 195V, at the same time, this DC voltage is also input to the input port of the brake power detection circuit, after rectification by the second rectifier circuit, current limiting by the current limiting circuit and voltage division by the voltage division circuit, the output port of the optocoupler ISO1 outputs high level. If the central control MCU gets high level signal, it means that the work is normal.

[0045] Figure 1 The shown embodiment, possible faults and corresponding processing methods are as follows:

[0046] 1. The first air circuit breaker switch QF1-1, the first relay switch K1, the second relay switch K2 and the third relay switch KM1 may have contact sticking. Since the first air circuit breaker switch QF1-1, the first relay switch K1, the second relay switch K2 and the third relay switch KM1 are in series in the power supply circuit, if any of the contacts is stuck, the other contacts can be broken;

[0047] 2. Any one of the first air circuit breaker switch QF1-1, the first relay switch K1, the second relay switch K2 and the third relay switch KM1 is open, the brake power detection circuit detects no brake power signal, the output end of the isolation circuit outputs low level signal to the central control MCU, the central control MCU can cut off the motor operation instruction, and cut off the brake opening instruction to prevent the motor from wearing the brake pad;

[0048] 3. The rear circuit of the first air circuit breaker switch QF1-1 is short-circuited, that is, the first rectifier circuit BR1 and the motor brake are short-circuited, the first air circuit breaker switch QF1-1 is opened to break the rear circuit, and at the same time, as shown in the figure, the second air circuit breaker switch QF1-2 breaks the +24V power supply of the central control MCU, and the motor will stop running because of losing the running signal; Figure 1

[0049] 4. When the central control MCU does not send the motor operation instruction, and the brake power detection circuit detects the brake power signal, that is, the central control MCU gets high level signal, at this time, the first relay switch K1, the second relay switch K2 and the third relay switch KM1 are all disconnected, and the brake power is cut off to prevent the brake from loosening and causing the elevator to slide down and cause safety accidents.

[0050] ​The above lists one embodiment of the present application, and the clutch power supply fault can also be judged and processed by other embodiments according to the detection signal output by the output port of the clutch power supply detection circuit.

[0051] The above description is an explanation of the present application, not a limitation of the application, and the scope of the present application is defined in the claims. The present application can be modified in any form without departing from the basic structure of the present application.

Claims

1. A power supply system for the operating brake of a construction hoist frequency converter, characterized in that: The power supply system includes a power supply circuit and a brake power detection circuit. The input port of the power supply circuit is connected to a three-phase power supply. The output port of the power supply circuit serves as the motor brake power interface. The output port of the power supply circuit is connected to the input port of the brake power detection circuit. The power supply circuit includes a transformer, an air circuit breaker, a relay, and a first rectifier circuit. The input port of the transformer is connected to a three-phase power supply. The first output terminal of the transformer is connected in series with the first air circuit breaker switch and the first set of relay switches, and then connected to the first input terminal of the first rectifier circuit. The second output terminal of the transformer is connected to the second input terminal of the first rectifier circuit. The output terminal of the first rectifier circuit is connected in series with the second set of relay switches, and then serves as the motor brake power interface. The brake power detection circuit includes a second rectifier circuit, a current limiting circuit, a voltage divider circuit, and an isolation circuit. The output port of the brake power detection circuit outputs a detection signal, which is input to the central control MCU. The brake power detection circuit also includes a second air circuit breaker switch, which is used to disconnect the +24V power supply to the central control MCU.

2. The power supply system for the inverter brake of the construction hoist as described in claim 1, characterized in that: The brake power supply detection circuit includes a second rectifier circuit, a current limiting circuit, a voltage divider circuit, and an isolation circuit. The input port of the second rectifier circuit is connected to the output port of the power supply circuit. The first output terminal of the second rectifier circuit is connected to the first terminal of the current limiting circuit, the second terminal of the current limiting circuit is connected to the first terminal of the voltage divider circuit, the second terminal of the voltage divider circuit is connected to the first input terminal of the isolation circuit, and the second output terminal of the second rectifier circuit is connected to the second input terminal of the isolation circuit. The output terminal of the isolation circuit outputs a detection signal.

3. The construction hoist frequency converter brake power supply system according to claim 2, characterized in that: The second rectifier circuit is a bridge rectifier circuit.

4. The construction hoist frequency converter brake power supply system according to claim 2, characterized in that: The current limiting circuit includes three sets of parallel circuits; the first set of parallel circuits includes a first resistor, a second resistor, and a third resistor connected in parallel; the second set of parallel circuits includes a fourth resistor, a fifth resistor, and a sixth resistor connected in parallel; the third set of parallel circuits includes a seventh resistor, an eighth resistor, and a ninth resistor connected in parallel; the first set of parallel circuits, the second set of parallel circuits, and the third set of parallel circuits are connected in series to form the current limiting circuit.

5. The power supply system for the inverter brake of the construction hoist as described in claim 2, characterized in that: The voltage divider circuit includes a tenth resistor and an eleventh resistor connected in parallel.

6. The construction hoist frequency converter brake power supply system according to claim 2, characterized in that: The isolation circuit includes an optocoupler.

7. The power supply system for the inverter brake of the construction hoist as described in claim 2, characterized in that: A DC support capacitor is connected in parallel between the second terminal of the current limiting circuit and the second output terminal of the second rectifier circuit.

8. The power supply system for the inverter brake of the construction hoist as described in claim 2, characterized in that: A TVS diode is connected in parallel at the output port of the isolation circuit.

9. The power supply system for the inverter brake of the construction hoist as described in claim 2, characterized in that: A signal indicator light is connected in series between the first input terminal of the isolation circuit and the second terminal of the voltage divider circuit.

10. A control method for a construction hoist frequency converter brake power supply system as described in any one of claims 1 to 9, characterized in that, include: If any one of the first air circuit breaker switch, the first relay switch, the second relay switch, and the third relay switch experiences contact sticking, the other contacts will be disconnected. When any one of the first air circuit breaker switch, the first relay switch, the second relay switch, and the third relay switch fails to open, the brake power supply detection circuit detects no brake power supply signal. The output of the isolation circuit outputs a low-level signal to the central control MCU. The central control MCU cuts off the motor running command and simultaneously cuts off the brake release command to prevent the motor from wearing the brake pads. When a short circuit occurs in the back-end circuit of the first air circuit breaker, the first air circuit breaker is opened to disconnect the back-end circuit. At the same time, the second air circuit breaker disconnects the +24V power supply to the central control MCU, and the motor will lose its running signal and stop running. When the central control MCU does not issue a motor running command, but the brake power detection circuit detects the brake power signal, that is, the central control MCU receives a high-level signal, the first relay switch, the second relay switch and the third relay switch are all disconnected to cut off the brake power supply and prevent the elevator from sliding down due to the release of the brake.

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