Safety brake control circuit and elevator

Abstract

The utility model relates to a safety braking control circuit and an elevator, and the circuit comprises an isolation rectification circuit which is used for supplying power to a motor braking device; the safety loop power supply control circuit comprises a safety signal conversion circuit and a switching power supply loop, is controlled by a safety loop and is used for outputting a power supply signal; the brake power supply excitation module is controlled by the microprocessor and is used for outputting an excitation signal; and the brake power supply driving module is respectively connected with the output end of the safety loop power supply control circuit and the output end of the brake power supply excitation module, is connected to the input end of the isolation rectification circuit, and is used for receiving the power supply signal and the excitation signal and providing a driving power supply for the isolation rectification circuit. According to the elevator safety circuit, the driving power supply of the isolation rectification circuit can be cut off through the safety circuit power supply control circuit according to on-off of the elevator safety circuit, so that the power supply of the motor braking device is directly cut off to achieve safety braking, and the problem that safety of braking control is not high is solved.

Description

Technical Field

[0001] The present application relates to the technical field of elevator control, and in particular to a safety brake control circuit and an elevator. Background Art

[0002] The motor brake is an electromechanical device that prevents the elevator from moving when the elevator car is stationary and the motor is in a power-off state. During operation, the power supply of the elevator safety circuit to the contactor coil is cut off. After the contactor loses power, the power supply to the motor brake is cut off, the electromagnet of the motor brake loses its magnetic force, the brake shoe is released, and braking force is applied to the elevator car, locking it in the current position to achieve the effect of elevator brake locking.

[0003] The current prior art mainly uses contactors to cut off the power supply to the motor brake. However, when the contactor is disconnected, there is a contact arcing phenomenon, which shortens the service life of the contactor and may cause the contacts to stick or burn, resulting in a high contactor failure rate and easily causing safety hazards such as elevator stoppage and trapping people.

[0004] With regard to the problem of low safety of braking control in related technologies, no effective solution has been proposed so far. Utility Model Content

[0005] Based on this, it is necessary to provide a safety brake control circuit and an elevator that can achieve safety braking in response to the above technical problems.

[0006] In a first aspect, a safety brake control circuit is provided in this embodiment, including:

[0007] An isolated rectifier circuit for supplying power to the motor brake device;

[0008] The safety circuit power control circuit is controlled by the safety circuit and is used to output a power signal;

[0009] The brake power excitation module is controlled by a microprocessor and is used to output an excitation signal;

[0010] A brake power drive module is respectively connected to the output end of the safety loop power control circuit and the output end of the brake power excitation module, and is connected to the input end of the isolation rectifier circuit, and is used to receive the power signal and the excitation signal, and provide a drive power supply for the isolation rectifier circuit;

[0011] Wherein, the safety loop power supply control circuit comprises:

[0012] A safety signal conversion circuit, connected to the safety circuit, for converting an AC signal of a safety circuit power supply into a DC signal;

[0013] The switch power supply circuit is connected between the safety signal conversion circuit and the brake power drive module, and is used to convert the DC signal into the power supply signal.

[0014] In some of the embodiments, the safety signal conversion circuit includes: a rectifier device;

[0015] The switching power supply circuit includes: a first transformer, a driver connected to the primary side of the first transformer, and a plurality of rectifier diodes connected to the secondary side of the first transformer.

[0016] In some of the embodiments, the safety signal conversion circuit further includes a second transformer, the primary side of the second transformer is connected to the safety loop, and the secondary side of the second transformer is connected to the rectifier device;

[0017] The switching power supply circuit also includes a DC-DC module, the input end of the DC-DC module is connected to the output end of the rectifier device, and the output end of the DC-DC module is connected to the input end of the driver.

[0018] In some of the embodiments, the safety signal conversion circuit also includes a capacitor and a DC-DC module, the output end of the rectifier device is connected to the capacitor and the DC-DC module in sequence, and the output end of the DC-DC module is connected to the driver of the switching power supply circuit.

[0019] In some of the embodiments, the end of the safety loop is connected to a first contactor and a second contactor, and the first contactor and the second contactor respond to the on and off of the safety loop;

[0020] The safety signal conversion circuit is connected between the first contactor and the second contactor, and the switch power supply circuit is connected between the second contactor and the brake power drive module.

[0021] In some embodiments, the switching power supply circuit includes one of a flyback conversion topology, a forward conversion topology, a half-bridge conversion topology, and a full-bridge conversion topology.

[0022] In some of the embodiments, the brake power drive module includes: a plurality of drive chips;

[0023] The power supply end of each of the driving chips is connected to the output end of the switching power supply circuit, and the output end of each of the driving chips is connected to the control end of the power semiconductor in the isolation rectifier circuit.

[0024] In some of the embodiments, the brake power excitation module includes: a buffer;

[0025] The input end of the buffer is connected to the microprocessor, and the output end of the buffer is connected to the input end of the brake power drive module through a pull-up resistor and / or a pull-down resistor;

[0026] The buffer is one or a plurality of buffers connected in series.

[0027] In some of the embodiments, the isolated rectifier circuit includes: a third transformer, an inverter circuit or a push-pull circuit connected to the primary side of the third transformer, a rectifier circuit connected to the secondary side of the third transformer, and a second power semiconductor connected in series between the output end of the rectifier circuit and the motor brake device, the inverter circuit or the push-pull circuit including a plurality of first power semiconductors;

[0028] The braking power drive module includes two groups, the two groups of braking power drive modules are respectively connected to the control ends of the first power semiconductor and the second power semiconductor, and each group of braking power drive modules includes one or more driving chips.

[0029] In a second aspect, an elevator is provided in this embodiment, comprising a safety circuit, a motor braking device, and the safety braking control circuit as described in the first aspect.

[0030] Compared with the related art, the safety brake control circuit and elevator provided in this embodiment include: an isolated rectifier circuit for supplying power to the motor brake device; a safety circuit power supply control circuit, which is controlled by the safety circuit and is used to output a power supply signal; a brake power supply excitation module, which is controlled by a microprocessor and is used to output an excitation signal; a brake power supply drive module, which is respectively connected to the output end of the safety circuit power supply control circuit and the output end of the brake power supply excitation module, and is connected to the input end of the isolated rectifier circuit, for receiving the power supply signal and the excitation signal, and providing a drive power supply for the isolated rectifier circuit; wherein the safety circuit power supply control circuit includes: a safety signal conversion circuit, which is connected to the safety circuit and is used to convert the AC signal of the safety circuit power supply into a DC signal; a switch power supply circuit, which is connected between the safety signal conversion circuit and the brake power supply drive module, and is used to convert the DC signal into the power supply signal. Through this embodiment, according to the on-off of the elevator safety circuit, the drive power supply of the isolated rectifier circuit can be cut off through the safety circuit power supply control circuit and the brake power supply drive module, so as to directly cut off the power supply of the motor brake device to achieve safe braking, thereby solving the problem of low safety of brake control.

[0031] Details of one or more embodiments of the present application are set forth in the following drawings and description to make other features, objects, and advantages of the present application more readily apparent. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0033] Figure 1 is a structural block diagram of a safety brake control circuit in one embodiment;

[0034] Figure 2 is a circuit diagram of a safety brake control circuit in an embodiment;

[0035] Figure 3 is a block diagram of a safety brake control circuit in another embodiment;

[0036] Figure 4 is a circuit diagram of a safety brake control circuit in another embodiment;

[0037] Figure 5 is a circuit diagram of a safety brake control circuit in yet another embodiment;

[0038] Figure 6 is a circuit diagram of a safety brake control circuit in yet another embodiment. DETAILED DESCRIPTION

[0039] In order to more clearly understand the purpose, technical solutions and advantages of the present application, the present application is described and illustrated below in conjunction with the accompanying drawings and embodiments.

[0040] Unless otherwise defined, the technical terms or scientific terms involved in this application shall have the general meaning understood by people with ordinary skills in the technical field to which this application belongs. The words "one", "a", "a", "the", "these" and the like in this application do not represent quantitative restrictions, and they can be singular or plural. The terms "include", "comprise", "have" and any variants thereof involved in this application are intended to cover non-exclusive inclusions; for example, a process, method and system, product or device comprising a series of steps or modules (units) is not limited to the listed steps or modules (units), but may include unlisted steps or modules (units), or may include other steps or modules (units) inherent to these processes, methods, products or devices. The words "connect", "connected", "coupled" and the like involved in this application are not limited to physical or mechanical connections, but may include electrical connections, whether directly or indirectly. The "multiple" involved in this application refers to two or more. "And / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, "A and / or B" can mean: A exists alone, A and B exist at the same time, and B exists alone. Usually, the character " / " indicates that the objects associated with each other are in an "or" relationship. The terms "first", "second", "third", etc. involved in this application are only used to distinguish similar objects and do not represent a specific ordering of the objects.

[0041] The motor brake is an electromechanical device that prevents the elevator from moving when the elevator car is stationary and the motor is in a power-off state. During operation, the power supply of the elevator safety circuit to the contactor coil is cut off. After the contactor loses power, the power supply to the motor brake is cut off, the electromagnet of the motor brake loses its magnetic force, the brake shoe is released, and braking force is applied to the elevator car, locking it in the current position to achieve the effect of elevator brake locking.

[0042] The current prior art mainly uses contactors to cut off the power supply to the motor brake. However, when the contactor is disconnected, there is a contact arcing phenomenon, which shortens the service life of the contactor and may cause the contacts to stick or burn, resulting in a high contactor failure rate and easily causing safety hazards such as elevator stoppage and trapping people.

[0043] In this embodiment, a safety brake control circuit is provided. Figure 1 is a block diagram of a safety brake control circuit in one embodiment. Figure 1 As shown, the circuit includes: a safety loop power control circuit, an isolation rectifier circuit, a brake power excitation module, and at least one brake power drive module ( Figure 1 Only one is shown);

[0044] The input end of the safety circuit power supply control circuit is connected to the safety circuit;

[0045] The input end of at least one brake power drive module is connected to the output end of the safety loop power control circuit and the output end of the brake power excitation module respectively;

[0046] The input end of the isolation rectifier circuit is connected to the output end of at least one brake power drive module; the output end of the isolation rectifier circuit is connected to the motor brake device; wherein,

[0047] A safety circuit power control circuit is controlled by the safety circuit and is used to provide a power signal to at least one brake power drive module according to the on / off of the safety circuit;

[0048] A brake power excitation module, controlled by a microprocessor, for providing an excitation signal to at least one brake power drive module according to a control signal of the microprocessor;

[0049] A brake power drive module is used to provide drive power to the isolated rectifier circuit according to a power signal and an excitation signal;

[0050] An isolated rectifier circuit for supplying power to the motor brake device;

[0051] The safety circuit power supply control circuit includes: a safety signal conversion circuit and a switch power supply circuit;

[0052] The input end of the safety signal conversion circuit is connected to the safety loop and is used to convert the AC signal of the safety loop power supply into a DC signal;

[0053] The input end of the switching power supply circuit is connected to the output end of the safety signal conversion circuit, and the output end of the switching power supply circuit is connected to at least one braking power drive module, which is used to convert the DC signal output by the safety signal conversion circuit into a power signal of at least one braking power drive module.

[0054] Specifically, the elevator safety circuit is composed of electrical safety switches of various elevator safety components connected in series, and the ends thereof are connected to the running contactor and the brake contactor, namely the first contactor and the second contactor. Only when all electrical safety switches are turned on, the safety circuit is turned on and the two contactors at the ends are attracted. The safety circuit is turned on, which means that all safety components are working normally. Otherwise, if any safety component fails, its electrical safety switch is disconnected, and then the safety circuit is disconnected, and the two contactors at the ends are also disconnected. Only when the safety circuit is turned on, the safety circuit power supply is output to the safety circuit power supply control circuit connected to it, thereby supplying power to the brake power drive module.

[0055] The input end of the safety circuit power control circuit is connected to the safety circuit of the elevator, and the output end is connected to the input end of at least one brake power drive module. When there are multiple brake power drive modules, the output end of the safety circuit power control circuit is respectively connected to the input end of each brake power drive module. The input end of the safety signal conversion circuit in the safety circuit power control circuit is connected to the safety circuit to convert the AC signal of the safety circuit power supply into a DC signal. The switching power circuit is used to convert the DC signal output by the safety signal conversion circuit into a power signal with a voltage acceptable to the brake power drive module. The safety circuit power control circuit converts the safety circuit power supply into a power signal, and supplies power to the brake power drive module through the power signal.

[0056] For the brake power drive module, its input end is also connected to the output end of the brake power excitation module. Under the control signal of the microprocessor, the brake power excitation module outputs the excitation signal to at least one brake power drive module.

[0057] For at least one brake power drive module, its output end is connected to the input end of the isolation rectifier circuit, receives the excitation signal output by the brake power excitation module and the power signal output by the safety loop power control circuit, and provides driving power for the isolation rectifier circuit according to the excitation signal and power supply conditions.

[0058] It can be understood that only when the brake power drive module is powered can it receive the excitation signal and provide driving power for the isolated rectifier circuit when receiving the excitation signal; if the brake power drive module loses power, that is, the safety circuit power control circuit does not output a power signal to the brake power drive module, then regardless of whether the brake power excitation module has an output excitation signal, the brake power drive module cannot provide driving power for the isolated rectifier circuit, resulting in power loss in the isolated rectifier circuit.

[0059] The isolation rectifier circuit may include a push-pull isolation rectifier circuit or an inverter isolation rectifier circuit, and the output end of the isolation rectifier circuit is connected to the motor brake device to supply power to the motor brake device. When the isolation rectifier circuit supplies power to the motor brake device under the drive of the driving power supply, the motor brake device power supply is powered on, the brake is opened and the elevator runs; when the isolation rectifier circuit has no driving power supply, the motor brake device power supply is disconnected, and the brake is applied to stop the elevator.

[0060] In some of the embodiments, Figure 1 As shown, the above circuit also includes: a rectifier input module;

[0061] The rectifier input module is connected to the input end of the isolated rectifier circuit and is used to provide input voltage for the isolated rectifier circuit.

[0062] Among them, the rectifier input module is connected to the mains, and the mains voltage provides stable input voltage and energy support for the isolated rectifier circuit through the rectifier input module.

[0063] When the elevator's safety circuit is normally connected, the safety circuit power control circuit supplies power to the brake power drive module. When the microprocessor sends a control signal to the brake power excitation module, the brake power excitation module outputs an excitation signal to the brake power drive module. The brake power drive module provides drive power for the isolated rectifier circuit, the motor brake device power is powered on, and the brake opens to start the elevator. When the safety circuit is disconnected, the safety circuit power control circuit stops supplying power to the brake power drive module, and the brake power drive module is powered off. At this time, it is not controlled by the excitation signal, the isolated rectifier circuit has no drive power, the motor brake device power is disconnected, and the brake stops the elevator.

[0064] Through the above circuit, when the elevator safety circuit is turned on, the microprocessor can control the on and off of the isolation rectifier circuit through the brake power drive module, thereby controlling the motor brake device to open or hold the brake; when the elevator safety circuit is disconnected, the power supply of the brake power drive module is disconnected through the safety circuit power control circuit, and then the drive power of the isolation rectifier circuit is cut off, and the motor brake device is powered off to achieve braking. When the elevator safety circuit is disconnected, the power supply of the motor brake device is not controlled by the microprocessor or the excitation signal, but the power supply of the motor brake device is more effectively cut off. Therefore, even when the microprocessor, the brake power excitation module, and the brake power drive module fail, they can be shut down to achieve braking, with faster response speed and higher safety. Compared with the prior art of cutting off the motor brake power supply through a contactor, the problem of low safety of braking control is solved.

[0065] Figure 2 FIG. 1 is a circuit diagram of a safety brake control circuit in this embodiment. Figure 2 As shown, in some embodiments, a first contactor Y1-SW and a second contactor Y2-BY are connected to the end of the safety circuit, and the first contactor Y2-BY and the second contactor Y2-BY respond to the on and off of the safety circuit; the safety signal conversion circuit is connected between the first contactor Y1-SW and the second contactor Y2-BY, and the switching power supply circuit is connected between the second contactor Y2-BY and at least one brake power drive module.

[0066] Specifically, the two contactors Y1-SW and Y2-BY connected at the end of the safety circuit both respond to the on and off of each electrical safety switch in the safety circuit. When an electrical safety switch in the safety circuit is disconnected, the first contactor Y1-SW and the second contactor Y2-BY are disconnected; when the safety circuit is normally connected, the first contactor Y1-SW and the second contactor Y2-BY are closed.

[0067] In some of the embodiments, the safety signal conversion circuit includes: a rectifier device;

[0068] The switch power supply circuit includes: a first transformer, a driver connected to the primary side of the first transformer, and a plurality of rectifier diodes connected to the secondary side of the first transformer.

[0069] The safety signal conversion circuit also includes a capacitor and a DC-DC module. The output end of the rectifier device is connected to the capacitor and the DC-DC module in sequence. The output end of the DC-DC module is connected to the driver of the switching power supply circuit.

[0070] like Figure 2 As shown, the input end of the safety signal conversion circuit is connected to the safety loop. The safety signal conversion circuit includes a soft start resistor NTC, a rectifier device Q7, a capacitor C3 and a DC-DC module IC6. The switching power supply circuit includes a first transformer T2, a driver IC7 connected to the primary side of the first transformer T2, and a plurality of rectifier diodes Q8, Q9, and Q10 connected to the secondary side of the first transformer T2.

[0071] The soft start resistor NTC in the safety signal conversion circuit charges the capacitor C3 through the rectifier device Q7 to convert the AC signal of the safety circuit power supply into a DC signal. Among them, the soft start resistor NTC can be a relay contact parallel resistor or a thyristor parallel resistor. The DC signal is processed by the DC-DC module IC6 for voltage change and converted into a voltage signal. Among them, the converted voltage signal needs to meet any voltage level acceptable to the back-end switching power supply circuit. For example, the voltage signal can be +15V.

[0072] The input end of the switching power supply circuit is connected to the output end of the safety signal conversion circuit. The voltage signal is chopped by the driver IC7 connected to the primary side of the first transformer T2, and the energy of the primary inductance of the first transformer T2 is stored and released to generate the required energy on the secondary side of the first transformer T2. A voltage source is generated through a plurality of rectifier diodes Q8, Q9, and Q10, that is, a power supply signal with high driving capability is used as the power supply for the brake power drive module.

[0073] The output end of the switch power supply circuit is connected to at least one brake power drive module, and the strong electric signal generated by the rectifier diodes Q8, Q9, and Q10 is output to at least one brake power drive module. When the safety brake control circuit includes a brake power drive module, such as Figure 2 As shown, the rectifier diode Q8 is connected to the brake power drive module 1 to output a strong electric signal with high driving capability as a power signal to supply power to the brake power drive module 1 .

[0074] In some of the embodiments, the safety signal conversion circuit includes: a rectifier device;

[0075] The switch power supply circuit includes: a first transformer, a driver connected to the primary side of the first transformer, and a plurality of rectifier diodes connected to the secondary side of the first transformer.

[0076] Among them, the safety signal conversion circuit also includes a second transformer, the primary side of the second transformer is connected to the safety circuit, and the secondary side of the second transformer is connected to the rectifier device; the switching power supply circuit also includes a DC-DC module, the input end of the DC-DC module is connected to the output end of the rectifier device, and the output end of the DC-DC module is connected to the input end of the driver.

[0077] Specifically, the safety signal conversion circuit includes a second transformer and a rectifier device, and the safety loop power supply sequentially converts the AC signal of the safety loop power supply into a DC signal through the second transformer and the rectifier device.

[0078] The DC signal is processed by the DC-DC module in the switching power supply circuit for voltage change and converted into a voltage signal. The converted voltage signal needs to meet any voltage level acceptable to the back-end circuit. The voltage signal is voltage-chopped by the driver connected to the primary side of the first transformer, and the energy of the primary inductance of the first transformer is stored and released to generate the required energy on the secondary side of the first transformer, and a voltage source is generated through a number of rectifier diodes, that is, a power signal with high driving capability as the power supply for the brake power drive module.

[0079] In the above two embodiments, the AC signal of the safety circuit power supply is converted into a strong electric signal with high driving capability, i.e., a power signal, through a safety signal conversion circuit and a switching power supply circuit, and output to at least one brake power drive module as a power supply. When the safety circuit is disconnected, the brake power drive module can be powered off and is not controlled by the excitation signal, thereby achieving braking by powering off the brake power drive module through hardware shutdown.

[0080] In some embodiments, the switching power supply circuit includes one of a flyback conversion topology, a forward conversion topology, a half-bridge conversion topology, and a full-bridge conversion topology.

[0081] Specifically, in the switching power supply circuit, any one of a flyback conversion topology, a forward conversion topology, a half-bridge conversion topology and a full-bridge conversion topology can be used. Among them, the prototype of the flyback conversion topology is the BUCK-BOOST circuit, which stores magnetic field energy when the switch is turned on, and converts the magnetic field energy into electric field energy when the switch is turned off and sends it to the load and output filter capacitor, compensating for the consumption of the capacitor when providing the load current alone; in the forward conversion topology, when the switch tube is turned on, the secondary winding of the transformer provides power to the load and charges the capacitor connected in parallel at the output end. When the switch is turned off, the voltage induced by the secondary winding of the transformer is opposite to the polarity of the primary voltage. After superimposed with the output voltage, it will play a reflective role to prevent the circulation formed from the output end through the secondary winding of the transformer, that is, to isolate the secondary winding of the transformer from the output end; the working principle of the half-bridge conversion topology is to work through the midpoints of the two half-bridges. When one of the transistors is turned off, the voltage stress it bears is Vdc (DC input voltage) instead of 2Vdc, which makes it mainly used in small and medium power occasions. The full-bridge conversion topology is more suitable for high power occasions, especially for the needs of high voltage and high power output.

[0082] In this embodiment, different topologies in the switching power supply circuit are provided, and selection can be made according to specific application requirements, such as power, voltage, efficiency, etc.

[0083] In some of the embodiments, Figure 2 As shown, the brake power excitation module includes: a buffer IC5;

[0084] The input end of the buffer IC5 is connected to the microprocessor MCU, and the output end of the buffer IC5 is connected to the input end of at least one brake power drive module through a pull-up resistor and / or a pull-down resistor; the buffer is one or multiple ( Figure 2 Only one is shown).

[0085] Specifically, the microprocessor MCU outputs 4 PWM signals connected to the input end of the buffer IC5, and the output end of IC5 needs to be connected to the input end of the brake power drive module after connecting the pull-up resistor and / or the pull-down resistor, that is, connected to the input end of the driver chip IC1 and IC2, so as to provide the brake power drive module with excitation signals such as PWM signals with weak current and low driving capability. Among them, the buffer IC5 can also be an enabled buffer.

[0086] In some of the embodiments, Figure 2 As shown, the brake power drive module includes: a number of drive chips IC1, IC2;

[0087] The power supply end of each driver chip IC1, IC2 is connected to the output end of the switch power supply circuit, and the output end of each driver chip IC1, IC2 is connected to the control end of the power semiconductor Q2, Q3 in the isolation rectifier circuit.

[0088] Specifically, the power semiconductors Q2 and Q3 can be power semiconductors such as IGBT (Insulated Gate Bipolar Transistor), MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor), SCR (Silicon Controlled Rectifier), etc. The driver chips IC1 and IC2 can be driver chips of power semiconductors, which include isolation type and non-isolation type. The function of the driver chip is to provide a stable and reliable driving power supply for the power semiconductor devices in the isolated rectifier circuit according to the excitation signal output by the brake power excitation module and the power signal output by the rectifier diode in the switching power supply circuit, so as to ensure its normal operation and efficient operation. Among them, the driver chip is also used to convert the excitation signal such as the PWM signal with weak current and low driving capability output by the brake power excitation module into a strong electric signal with high driving capability as the driving power supply.

[0089] The driving chip of the brake power driving module in this embodiment is connected to the power semiconductor in the isolated rectifier circuit to provide driving power for the isolated rectifier circuit.

[0090] In some of the embodiments, Figure 2 As shown, the isolated rectifier circuit includes: a third transformer T1, an inverter circuit or a push-pull circuit connected to the primary side of the third transformer T1, and a rectifier circuit connected to the secondary side of the third transformer T1, and the inverter circuit or the push-pull circuit includes a plurality of first power semiconductors Q2 and Q3.

[0091] The rectifier circuit includes a rectifier device Q4, an inductor L1 and a capacitor C2. The gate of the first power semiconductor Q2 is connected to the output of the driver chip IC1 in the brake power driver module 1, the gate of the first power semiconductor Q3 is connected to the output of the driver chip IC2 in the brake power driver module 1, and the primary side of the third transformer T1 is connected to the collectors of the first power semiconductors Q2 and Q3 respectively. The secondary side of the third transformer T1 is connected to the rectifier device Q4 for full-wave rectification, and after rectification by the rectifier device Q4, it is filtered through the inductor L1 and the capacitor C2 to form a sine wave voltage, which is connected to the motor brake device.

[0092] Figure 2 The isolated rectifier circuit adopts a push-pull isolated rectifier circuit. In other embodiments, the isolated rectifier circuit may also adopt an inverter isolated rectifier circuit, including a full-bridge topology or a half-bridge topology.

[0093] In this embodiment, the isolated rectifier circuit controls the power supply of the motor brake device under the output control of the brake power drive module, and supplies power or cuts off power to the motor brake device to achieve opening or braking.

[0094] In some of the embodiments, Figure 2 As shown, the rectifier input module includes: a rectifier device Q1;

[0095] The rectifier input module further includes a soft-start resistor NTC1 and a capacitor C1, and the capacitor C1 is connected to the primary side of the third transformer T1 in the isolation rectifier circuit.

[0096] Specifically, the AC220V voltage of the mains passes through the soft-start resistor NTC1, charges the capacitor C1 through the rectifier device Q1, and the positive electrode of the capacitor C1 is connected to the primary side of the third transformer T1 in the isolation rectifier circuit. The soft-start resistor NTC1 can be a relay contact parallel resistor or a thyristor parallel resistor.

[0097] The mains is connected to the rectifier input module in this embodiment, and is connected to the isolated rectifier circuit after rectification to provide input voltage for the isolated rectifier circuit.

[0098] In some of the embodiments, the isolated rectifier circuit includes: a third transformer, an inverter circuit or a push-pull circuit connected to the primary side of the third transformer, a rectifier circuit connected to the secondary side of the third transformer, and a second power semiconductor connected in series between an output end of the rectifier circuit and a motor brake device, the inverter circuit or the push-pull circuit including a plurality of first power semiconductors;

[0099] The brake power drive module includes two groups, the two groups of brake power drive modules are respectively connected to the control ends of the first power semiconductor and the second power semiconductor, and each group of brake power drive modules includes one or more drive chips.

[0100] Specifically, Figure 3 is a block diagram of the safety brake control circuit in this embodiment. Figure 3 As shown, the circuit includes: a safety signal conversion circuit, a switching power supply circuit, an isolation rectifier circuit, a rectifier input module, a brake power excitation module, and two sets of brake power drive modules.

[0101] In the above embodiments Figure 1On the basis of, in this embodiment, the input end of each group of brake power drive modules is respectively connected to the output end of the switch power circuit and the output end of the brake power excitation module, and the output ends of the two groups of brake power drive modules are respectively connected to the control ends of the first power semiconductor and the second power semiconductor in the isolated rectifier circuit, providing driving power for the power semiconductor in the isolated rectifier circuit. Among them, each group of brake power drive modules includes one or more drive chips, and in this embodiment, the selection of the drive chip in each group of brake power drive modules is not restricted.

[0102] By setting up multiple groups of brake power drive modules, redundant protection is provided. That is, when the safety circuit is disconnected, if one group of brake power drive modules or the corresponding connected power semiconductors fail, the remaining brake power drive modules and the corresponding connected power semiconductors are used to cut off the drive power of the isolation rectifier circuit, and the motor brake device is powered off to achieve braking. In this way, double redundant protection can be achieved, further improving the safety of the elevator.

[0103] Figure 4 FIG. 1 is a circuit diagram of a safety brake control circuit in this embodiment. Figure 4 As shown, in Figure 2 Based on the circuit schematic diagram in FIG. 1 , the safety brake control circuit includes two groups of brake power drive modules. The brake power drive module 1 and the brake power drive module 2 include drive chips IC1, IC2, IC3, and IC4. The input ends of the drive chips IC1 and IC2 are connected to the rectifier diode Q8 in the switch power supply circuit. The input ends of the drive chips IC3 and IC4 are connected to the rectifier diodes Q9 and Q10 in the switch power supply circuit. In addition, the output end of the buffer IC5 in the brake power excitation module is connected to the input end of the drive chips IC1, IC2, IC3, and IC4 in the brake power drive module after passing through a pull-up resistor and / or a pull-down resistor.

[0104] The isolated rectifier circuit includes a transformer T1, an inverter circuit or a push-pull circuit connected to the primary side of the transformer T1, a rectifier circuit connected to the secondary side of the transformer T1, and second power semiconductors Q5 and Q6 connected in series between the output end of the rectifier circuit and the motor braking device. The inverter circuit or the push-pull circuit includes a plurality of first power semiconductors Q2 and Q3.

[0105] The rectifier circuit includes a rectifier device Q4, an inductor L1 and a capacitor C2. The gate of the first power semiconductor Q2 is connected to the output of the driver chip IC1 in the brake power driver module 1, the gate of the first power semiconductor Q3 is connected to the output of the driver chip IC2 in the brake power driver module 1, and the primary side of the transformer T1 is connected to the collectors of the first power semiconductors Q2 and Q3 respectively. The secondary side of the transformer T1 is connected to the rectifier device Q4 for full-wave rectification, and after rectification by the rectifier device Q4, it is filtered through the inductor L1 and the capacitor C2 to form a sinusoidal voltage, and the sinusoidal voltage is connected to the collectors of the second power semiconductors Q5 and Q6, and the emitters of the second power semiconductors Q5 and Q6 are connected to the motor brake device.

[0106] Figure 4 The isolated rectifier circuit adopts a push-pull isolated rectifier circuit. In other embodiments, the isolated rectifier circuit may also adopt an inverter isolated rectifier circuit, including a full-bridge topology or a half-bridge topology.

[0107] The purpose of using the first power semiconductors Q2, Q3 and the second power semiconductors Q5, Q6 is mainly to achieve dual-channel redundant protection. In the case where the failure of the peripheral circuit of the first power semiconductors Q2, Q3 (the first fault) combined with the subsequent failure of the peripheral circuit of the second power semiconductors Q5, Q6 (the second fault) leads to a failure of the elevator system, the power supply of the motor brake device can be more effectively disconnected to achieve braking when the safety circuit is disconnected through the safety signal conversion circuit and the switching power supply circuit, thereby improving the safety of the elevator system.

[0108] The present embodiment is described and illustrated below through preferred embodiments.

[0109] This embodiment provides a safety brake control circuit, such as Figure 4 As shown, it includes: a safety signal conversion circuit, a switching power supply circuit, a rectifier input module, a push-pull isolation rectifier circuit, a brake power excitation module and two sets of brake power drive modules.

[0110] Among them, the input end of the safety signal conversion circuit is connected to the safety loop, the contactor Y1-SW is connected to the end of the safety loop, the safety signal conversion circuit is connected between the contactor Y1-SW and Y2-BY, and the soft start resistor NTC in the safety signal conversion circuit charges the capacitor C3 through the rectifier device Q7 to convert the AC signal of the safety loop power supply into a DC signal. The DC signal is processed by the DC-DC module IC6 for voltage change and converted into a voltage signal. Among them, the converted voltage signal needs to meet the voltage of any voltage level acceptable to the back-end switching power supply circuit. The switching power supply circuit is connected to the other end of the contactor Y2-BY. The voltage signal is voltage-chopped by the driver IC7 in the switching power supply circuit, and the primary inductance of the transformer T2 is stored and released to generate the required energy on the secondary side of the transformer T2, and a voltage source is generated through a number of rectifier diodes Q8, Q9, and Q10. The strong electric signal with high driving capability, that is, the power signal, is used as the power supply of the brake power drive module.

[0111] The braking power drive module 1 and the braking power drive module 2 include driving chips IC1, IC2, IC3, and IC4. The input ends of the driving chips IC1 and IC2 are connected to the rectifier diodes Q8 in the switching power supply circuit, and the input ends of the driving chips IC3 and IC4 are connected to the rectifier diodes Q9 and Q10 in the switching power supply circuit. In addition, the output end of the buffer IC5 in the braking power excitation module is connected to the input ends of the driving chips IC1, IC2, IC3, and IC4 in the braking power drive module after passing through a pull-up resistor and / or a pull-down resistor.

[0112] In the push-pull isolated rectifier circuit, the gate of the power semiconductor Q2 is connected to the output of the driver chip IC1 in the brake power driver module 1, the gate of the power semiconductor Q3 is connected to the output of the driver chip IC2 in the brake power driver module 1, and the primary side of the transformer T1 is connected to the collectors of the power semiconductors Q2 and Q3 respectively. The secondary side of the transformer T1 is connected to the rectifier device Q4 for full-wave rectification, and after rectification by the rectifier device Q4, it is filtered through the inductor L1 and the capacitor C2 to form a sine wave voltage, and the sine wave voltage is connected to the collectors of the power semiconductors Q5 and Q6, and the emitters of the power semiconductors Q5 and Q6 are connected to the motor brake device.

[0113] The rectifier input module is connected to the mains, including soft-start resistor NTC1, rectifier device Q1 and capacitor C1. The AC220V voltage of the mains passes through the soft-start resistor NTC1, and charges capacitor C1 through rectifier device Q1. The positive electrode of capacitor C1 is connected to the primary side of transformer T1 in the push-pull isolation rectifier circuit, providing input voltage for the push-pull isolation rectifier circuit.

[0114] The safety circuit end contactors Y1-SW and Y2-BY both respond to the on and off of each electrical safety switch in the safety circuit. When the elevator's safety circuit is normally turned on, contactors Y1-SW and Y2-BY are closed, the power supply end of the brake power drive module is powered on, and the microprocessor sends a control signal to the brake power excitation module. The brake power drive module controls the power semiconductors Q2, Q3, Q5, and Q6 to turn on according to the excitation signal output by the brake power excitation module and the power signal output by the switch power circuit, providing driving power for the push-pull isolation rectifier circuit, the motor brake device power is powered on, and the brake opens the gate to run the elevator; when the safety circuit is disconnected, contactors Y1-SW and Y2-BY are disconnected, the brake power drive module is powered off, and it is not controlled by the excitation signal at this time. The power semiconductors Q2, Q3, Q5, and Q6 are all disconnected and disconnected, the push-pull isolation rectifier circuit has no driving power, the motor brake device power is disconnected, and the brake stops the elevator. In addition, when power semiconductors Q2, Q3 or Q5, Q6 fail, a group of power semiconductors that have not failed can still be effectively switched on and off. When the safety circuit is disconnected, the power supply of the motor brake device is disconnected and the brake is applied to stop the elevator.

[0115] Through the safety brake control circuit provided in this embodiment, according to the on-off of the elevator safety circuit, when braking is required, the power supply of the brake power drive module is disconnected through the safety signal conversion circuit and the switch power supply circuit, and then the drive power supply of the push-pull isolation rectifier circuit is cut off, and the motor brake device is powered off to achieve braking. Braking can be achieved through hardware shutdown, with faster response speed and higher safety, solving the problem of low safety of brake control. At the same time, power semiconductors Q2, Q3, Q5, and Q6 are used to achieve dual-channel redundant protection. In the case where the peripheral circuit failure of power semiconductors Q2 and Q3 (first fault) and the subsequent peripheral circuit failure of power semiconductors Q5 and Q6 (second fault) combine to cause an elevator system failure, the safety signal conversion circuit and the switch power supply circuit can be used to more effectively disconnect the power supply of the motor brake device when the safety circuit is disconnected to achieve braking, thereby improving the safety of the elevator system.

[0116] Figure 5 is a circuit diagram of a safety brake control circuit in this embodiment. In this embodiment, a safety brake control circuit is provided, such as Figure 5 As shown, the circuit includes: a safety signal conversion circuit, a switching power supply circuit, a rectifier input module, an inverter isolation rectifier circuit, a brake power excitation module and two sets of brake power drive modules.

[0117] Among them, the input end of the safety signal conversion circuit is connected to the safety loop, the contactor Y1-SW is connected to the end of the safety loop, the safety signal conversion circuit is connected between the contactors Y1-SW and Y2-BY, and includes a transformer T3 and a rectifier device Q7. The safety loop power supply converts the AC signal of the safety loop power supply into a DC signal through the transformer T3 and the rectifier device Q7 in turn.

[0118] The switching power supply circuit is connected to the other end of the contactor Y2-BY. The switching power supply circuit includes a DC-DC module IC6, a transformer T2, a driver IC7 connected to the primary side of the transformer T2, and several rectifier diodes Q8, Q9, and Q10 connected to the secondary side of the transformer T2. The DC signal output by the safety signal conversion circuit is processed by the DC-DC module IC6 in the switching power supply circuit for voltage change and converted into a voltage signal. Among them, the converted voltage signal needs to meet any voltage level acceptable to the back-end circuit. The voltage signal is voltage-chopped by the driver IC7, and the energy of the primary inductance of the transformer T2 is stored and released to generate the required energy on the secondary side of the transformer T2, and a voltage source is generated through several rectifier diodes Q8, Q9, and Q10. The strong electric signal with high driving capability, that is, the power signal, is used as the power supply for the brake power drive module.

[0119] The braking power drive module 1 and the braking power drive module 2 include driving chips IC1, IC2, IC3, and IC4. The input ends of the driving chips IC1 and IC2 are connected to the rectifier diodes Q8 in the switching power supply circuit, and the input ends of the driving chips IC3 and IC4 are connected to the rectifier diodes Q9 and Q10 in the switching power supply circuit. In addition, the output end of the buffer IC5 in the braking power excitation module is connected to the input ends of the driving chips IC1, IC2, IC3, and IC4 in the braking power drive module after passing through a pull-up resistor and / or a pull-down resistor.

[0120] In the inverter isolation rectifier circuit, the gates of power semiconductors Q2 and Q3 are connected to the output of driver chip IC1 in brake power driver module 1, the gates of power semiconductors Q4 and Q5 are connected to the output of driver chip IC2 in brake power driver module 1, and the primary side of transformer T1 is connected to the collectors of power semiconductors Q2, Q3, Q4, and Q5 respectively. The secondary side of transformer T1 is connected to rectifier devices D1 and D2 to limit the output amplitude and improve the output waveform. After rectification by rectifier devices D1 and D2, the sine wave voltage is connected to the collectors of power semiconductors Q11 and Q12, and the emitters of power semiconductors Q11 and Q12 are connected to the motor brake device.

[0121] The rectifier input module is connected to the mains, including the rectifier device Q1. The AC220V voltage of the mains is connected to the primary side of the transformer T1 in the inverter isolation rectifier circuit through the rectifier device Q1, providing input voltage for the inverter isolation rectifier circuit.

[0122] The safety circuit end contactors Y1-SW and Y2-BY both respond to the on and off of each electrical safety switch in the safety circuit. When the elevator's safety circuit is normally turned on, contactors Y1-SW and Y2-BY are closed, the power supply end of the brake power drive module is powered on, and the microprocessor sends a control signal to the brake power excitation module. The brake power drive module controls the power semiconductors Q2, Q3, Q4, Q5, Q11, and Q12 to turn on according to the excitation signal output by the brake power excitation module and the power signal output by the switch power circuit, providing driving power for the inverter isolation rectifier circuit, the motor brake device power is powered on, and the brake opens the gate to run the elevator. When the safety circuit is disconnected, contactors Y1-SW and Y2-BY are disconnected, the brake power drive module is powered off, and it is not controlled by the excitation signal at this time. The power semiconductors Q2, Q3, Q4, Q5, Q11, and Q12 are disconnected, the inverter isolation rectifier circuit has no driving power, the motor brake device power is disconnected, and the brake stops the elevator. In addition, when power semiconductors Q2, Q3, Q4, Q5 or Q11, Q12 fail, a group of power semiconductors that have not failed can still be effectively switched on and off. When the safety circuit is disconnected, the power supply of the motor brake device is disconnected and the brake is applied to stop the elevator.

[0123] Through the safety brake control circuit provided in this embodiment, according to the on-off of the elevator safety circuit, when braking is required, the power supply of the brake power drive module is disconnected through the safety signal conversion circuit and the switch power supply circuit, and then the drive power supply of the inverter isolation rectifier circuit is cut off, and the motor brake device is powered off to achieve braking. Braking can be achieved through hardware shutdown, with faster response speed and higher safety, solving the problem of low safety of brake control. At the same time, the role of power semiconductors Q2, Q3, Q4, Q5, Q11, and Q12 is mainly to achieve dual-channel redundant protection. In the case where the peripheral circuit failure (first fault) of power semiconductors Q2, Q3, Q4, and Q5 and the subsequent peripheral circuit failure (second fault) of power semiconductors Q11 and Q12 combine to cause an elevator system failure, the safety signal conversion circuit and the switch power supply circuit can be used to more effectively disconnect the power supply of the motor brake device when the safety circuit is disconnected to achieve braking, thereby improving the safety of the elevator system.

[0124] Figure 6 is a circuit diagram of a safety brake control circuit in this embodiment. In this embodiment, a safety brake control circuit is provided, such as Figure 6As shown, the circuit includes: a safety signal conversion circuit, a switching power supply circuit, a rectifier input module, an inverter isolation rectifier circuit, a brake power excitation module and two sets of brake power drive modules.

[0125] Among them, the input end of the safety signal conversion circuit is connected to the safety loop, the contactor Y1-SW is connected to the end of the safety loop, the safety signal conversion circuit is connected between the contactors Y1-SW and Y2-BY, and includes a transformer T4 and a rectifier Q7. The safety loop power supply converts the AC signal of the safety loop into a DC signal through the transformer T4 and the rectifier Q7 in turn.

[0126] The switching power supply circuit is connected to the other end of the contactor Y2-BY. The switching power supply circuit includes two transformers T2 and T3, which are respectively connected to the rectifier diodes Q8, Q9, Q10, and Q11 on the secondary sides of the two transformers T2 and T3. The primary side of the transformer T2 is connected to the driver IC7 and the DC-DC module IC6 in series, and the primary side of the transformer T3 is connected to the driver IC9 and the DC-DC module IC8 in series.

[0127] The DC signal output by the safety signal conversion circuit is processed by two DC-DC modules IC6 and IC8 for voltage change and converted into a voltage signal. The converted voltage signal needs to meet any voltage level acceptable to the back-end circuit. The voltage signal is chopped by drivers IC7 and IC9 respectively, and the energy of the primary inductance of transformers T2 and T3 is stored and released respectively, so as to generate the required energy on the secondary side of transformers T2 and T3 respectively, and a voltage source is generated through several rectifier diodes Q8, Q9, Q10, and Q11. The strong electric signal with high driving capability, i.e., the power signal, is used as the power supply for the brake power drive module.

[0128] The braking power drive module 1 and the braking power drive module 2 include driving chips IC1, IC2, IC3, and IC4. The input ends of the driving chips IC1 and IC2 are connected to the rectifier diodes Q8 and Q9 in the switching power supply circuit. The input ends of the driving chips IC3 and IC4 are connected to the rectifier diodes Q10 and Q11 in the switching power supply circuit. In addition, the braking power excitation module includes two buffers IC5 and IC10 connected in series. The output ends of the buffers IC5 and IC10 are connected to the input ends of the driving chips IC1, IC2, IC3, and IC4 in the braking power drive module after passing through pull-up resistors and / or pull-down resistors.

[0129] In the inverter isolation rectifier circuit, the gates of power semiconductors Q2 and Q3 are connected to the output of driver chip IC1 in brake power driver module 1, the gates of power semiconductors Q4 and Q5 are connected to the output of driver chip IC2 in brake power driver module 1, and the primary side of transformer T1 is connected to the collectors of power semiconductors Q2, Q3, Q4, and Q5 respectively. The secondary side of transformer T1 is connected to rectifier devices D1 and D2 to limit the output amplitude and improve the output waveform. After rectification by rectifier devices D1 and D2, the sine wave voltage is connected to the collectors of power semiconductors Q11 and Q12, and the emitters of power semiconductors Q11 and Q12 are connected to the motor brake device.

[0130] The rectifier input module is connected to the mains, including thyristor SCR1 and rectifier device Q1. The AC220V mains voltage is connected to the primary side of transformer T1 in the inverter isolation rectifier circuit through thyristor SCR1 and rectifier device Q1, providing input voltage for the inverter isolation rectifier circuit.

[0131] Contactors Y1-SW and Y2-BY respond to the on and off of the electrical safety switch in the safety circuit. When the elevator's safety circuit is normally turned on, contactors Y1-SW and Y2-BY are closed, the power supply end of the brake power drive module is powered on, and the main control board controls the microprocessor (full-bridge PWM control module) to send a control signal to the brake power excitation module. The brake power drive module controls the power semiconductors Q2, Q3, Q4, Q5, Q11, and Q12 to turn on according to the excitation signal output by the brake power excitation module and the power signal output by the safety circuit power control circuit, providing driving power for the inverter isolation rectifier circuit, and the motor brake device power is powered on, and the brake opens the gate to run the elevator. When the safety circuit is disconnected, contactors Y1-SW and Y2-BY are disconnected, the brake power drive module is powered off, and it is not controlled by the excitation signal at this time. The power semiconductors Q2, Q3, Q4, Q5, Q11, and Q12 are disconnected, the inverter isolation rectifier circuit has no driving power, the motor brake device power is disconnected, and the brake stops the elevator. In addition, when power semiconductors Q2, Q3, Q4, Q5 or Q11, Q12 fail, a group of power semiconductors that have not failed can still be effectively switched on and off. When the safety circuit is disconnected, the power supply of the motor brake device is disconnected and the brake is applied to stop the elevator.

[0132] Through the safety brake control circuit provided in this embodiment, according to the on-off of the elevator safety circuit, when braking is required, the power supply of the brake power drive module is disconnected through the safety signal conversion circuit and the switch power supply circuit, and then the drive power supply of the inverter isolation rectifier circuit is cut off, and the motor brake device is powered off to achieve braking. Braking can be achieved through hardware shutdown, with faster response speed and higher safety, solving the problem of low safety of brake control. At the same time, the role of power semiconductors Q2, Q3, Q4, Q5, Q11, and Q12 is mainly to achieve dual-channel redundant protection. In the case where the peripheral circuit failure (first fault) of power semiconductors Q2, Q3, Q4, and Q5 and the subsequent peripheral circuit failure (second fault) of power semiconductors Q11 and Q12 combine to cause an elevator system failure, the safety signal conversion circuit and the switch power supply circuit can be used to more effectively disconnect the power supply of the motor brake device when the safety circuit is disconnected to achieve braking, thereby improving the safety of the elevator system.

[0133] In this embodiment, an elevator is provided, including a safety circuit, a motor brake device, and the safety brake control circuit in the above embodiments;

[0134] A safety circuit connected to the input end of the safety brake control circuit, including a safety circuit power supply and a plurality of electrical safety switches;

[0135] The motor brake device is connected to the output end of the safety brake control circuit, and is powered on / off under the control of the safety brake control circuit to release / brake the elevator.

[0136] Specifically, the elevator's safety circuit is composed of electrical safety switches of various elevator safety components connected in series, with the operating contactor and brake contactor connected at the end. Only when all electrical safety switches are turned on, the safety circuit is turned on and the two contactors at the end are energized. The safety circuit is turned on, which means that all safety components are working normally. Otherwise, if any safety component fails, its electrical safety switch will be disconnected, and then the safety circuit will be disconnected, and the two contactors at the end will also be disconnected. The safety brake control circuit is connected to the safety circuit. According to the on and off of the safety circuit, the motor brake device is controlled to be powered on / off through the isolation rectifier circuit to release / brake the elevator.

[0137] When the safety circuit is turned on, the power supply of the motor brake device is energized, the brake is opened and the elevator runs; when the safety circuit is disconnected, the safety brake control circuit has no drive on the electrode brake device, the power supply of the motor brake device is disconnected, the brake stops the elevator, and then the brake can be shut down to achieve braking, with faster response speed and higher safety. Compared with the prior art of cutting off the power supply of the motor brake through a contactor, this solves the problem of low safety of brake control and improves the safety of the elevator.

[0138] It should be understood that the specific embodiments described herein are only used to explain the application, rather than to limit it. Based on the embodiments provided in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of this application.

[0139] Obviously, the drawings are only some examples or embodiments of the present application. For ordinary technicians in the field, the present application can also be applied to other similar situations based on these drawings without creative work. In addition, it is understandable that although the work done in this development process may be complicated and lengthy, for ordinary technicians in the field, certain changes in design, manufacturing or production based on the technical content disclosed in this application are only conventional technical means and should not be regarded as insufficient content disclosed in this application.

[0140] The term "embodiment" in this application refers to a specific feature, structure or characteristic described in conjunction with the embodiment that can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily mean the same embodiment, nor does it mean that it is mutually exclusive with other embodiments and is independent or optional. It is clearly or implicitly understood by those of ordinary skill in the art that the embodiments described in this application can be combined with other embodiments without conflict.

[0141] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of patent protection. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the scope of protection of the present application. Therefore, the scope of protection of the present application shall be subject to the attached claims.

Claims

1. A safety brake control circuit, characterized in that: include: An isolated rectifier circuit for supplying power to the motor brake device; The safety circuit power control circuit is controlled by the safety circuit and is used to output a power signal; The brake power excitation module is controlled by a microprocessor and is used to output an excitation signal; A brake power drive module is respectively connected to the output end of the safety loop power control circuit and the output end of the brake power excitation module, and is connected to the input end of the isolation rectifier circuit, and is used to receive the power signal and the excitation signal, and provide a drive power supply for the isolation rectifier circuit; Wherein, the safety loop power supply control circuit comprises: A safety signal conversion circuit, connected to the safety circuit, for converting an AC signal of a safety circuit power supply into a DC signal; The switch power supply circuit is connected between the safety signal conversion circuit and the brake power drive module, and is used to convert the DC signal into the power supply signal.

2. The safety brake control circuit according to claim 1, characterized in that: The safety signal conversion circuit includes: a rectifier device; The switching power supply circuit includes: a first transformer, a driver connected to the primary side of the first transformer, and a plurality of rectifier diodes connected to the secondary side of the first transformer.

3. The safety brake control circuit according to claim 2, characterized in that: The safety signal conversion circuit further includes a second transformer, the primary side of the second transformer is connected to the safety loop, and the secondary side of the second transformer is connected to the rectifier device; The switching power supply circuit also includes a DC-DC module, the input end of the DC-DC module is connected to the output end of the rectifier device, and the output end of the DC-DC module is connected to the input end of the driver.

4. The safety brake control circuit according to claim 2, characterized in that: The safety signal conversion circuit also includes a capacitor and a DC-DC module. The output end of the rectifier device is connected to the capacitor and the DC-DC module in sequence, and the output end of the DC-DC module is connected to the driver of the switching power supply circuit.

5. The safety brake control circuit according to claim 1, characterized in that: The end of the safety circuit is connected to a first contactor and a second contactor, and the first contactor and the second contactor respond to the on and off of the safety circuit; The safety signal conversion circuit is connected between the first contactor and the second contactor, and the switch power supply circuit is connected between the second contactor and the brake power drive module.

6. The safety brake control circuit according to claim 1, characterized in that: The switching power supply circuit includes one of a flyback conversion topology, a forward conversion topology, a half-bridge conversion topology and a full-bridge conversion topology.

7. The safety brake control circuit according to claim 1, characterized in that: The brake power drive module includes: a plurality of drive chips; The power supply end of each of the driving chips is connected to the output end of the switching power supply circuit, and the output end of each of the driving chips is connected to the control end of the power semiconductor in the isolation rectifier circuit.

8. The safety brake control circuit according to claim 1, characterized in that: The brake power excitation module includes: a buffer; The input end of the buffer is connected to the microprocessor, and the output end of the buffer is connected to the input end of the brake power drive module through a pull-up resistor and / or a pull-down resistor; The buffer is one or a plurality of buffers connected in series.

9. The safety brake control circuit according to claim 7, characterized in that: The isolated rectifier circuit comprises: a third transformer, an inverter circuit or a push-pull circuit connected to the primary side of the third transformer, a rectifier circuit connected to the secondary side of the third transformer, and a second power semiconductor connected in series between the output end of the rectifier circuit and the motor brake device, wherein the inverter circuit or the push-pull circuit comprises a plurality of first power semiconductors; The braking power drive module includes two groups, the two groups of braking power drive modules are respectively connected to the control ends of the first power semiconductor and the second power semiconductor, and each group of braking power drive modules includes one or more driving chips.

10. An elevator, characterized in that: It comprises a safety circuit, a motor braking device, and a safety braking control circuit as claimed in any one of claims 1 to 9.

Images