Emergency brake release power supply circuit and equipment

Abstract

The present application relates to an emergency brake release power supply circuit and device. The circuit includes: a control module, a switching component, and a power supply loop; the control module conducts the connection between the power supply loop and the corresponding interface device through the switching component, and then, when the mains power supply is normal, the control module controls the power supply loop to supply power to the standby battery of the device; and when a corresponding signal is detected, the control module controls the power supply loop to provide power to the device control system and controls the power supply loop to supply power to the brake coil; when the mains power supply is abnormal, if a corresponding signal is detected, the standby battery of the device provides power to the device control system through a DC-DC converter, and the control module controls the power supply loop to supply power to the brake coil through the switching component. Thus, the present application simplifies the circuit, realizes cost reduction through the multiplexing and normalization of the circuit, reduces the failure rate of the emergency brake release power supply circuit and device, and further reduces the cost.

Description

Technical Field

[0001] The present application relates to the technical field of electronic circuits, and particularly to an emergency brake release power supply circuit and device. Background Art

[0002] Currently, the emergency brake release power supply uses an independent power supply. The power supply circuit of the power supply and the battery circuit form a 1+1 backup through a combining control (charge and discharge relay), and a power supply is provided for the device control system through a DC-DC converter (Direct Current). At the same time, the brake release power supply circuit adopts a 1+1 backup form of the mains mode and the battery mode. Moreover, the DC-DC part of the mains mode uses a high-cost isolated converter, and according to the brake power characteristics on the market, basically adopts topologies such as double-switch forward, double-switch flyback, half-bridge or full-bridge. In addition, the DC-DC part of the battery mode also uses a high-cost isolated converter, and basically adopts topologies such as push-pull and full-bridge.

[0003] The traditional emergency brake release power supply has problems such as complex circuit, redundant design, and inability to meet the increasingly stringent cost requirements. Summary of the Invention

[0004] Based on this, it is necessary to provide an emergency brake release power supply circuit and device that can streamline the circuit and have a lower cost for the above technical problems.

[0005] In a first aspect, the present application provides an emergency brake release power supply circuit, which includes: a control module, a switching component, and a power supply circuit; the control module is respectively connected to the control end of the switching component and the control end of the power supply circuit; the control module is used to monitor the function power supply start signal and the brake release power supply start signal; wherein, the first end of the power supply circuit is used to connect to the mains power supply interface and to connect to the brake coil, and the second end of the power supply circuit is used to connect to the brake coil through the device backup battery and to connect to the device control system through a DC-DC converter;

[0006] When the mains power supply is normal, the control module conducts the connection between the first end of the power supply circuit and the mains power supply interface through the switching component, and controls the power supply circuit to supply power to the device backup battery; when the control module monitors the function power supply start signal, it starts the DC-DC converter so that the power supply circuit provides power to the device control system through the DC-DC converter; when the control module monitors the brake release power supply start signal, it conducts the connection between the first end of the power supply circuit and the brake coil through the switching component, and controls the power supply circuit to supply power to the brake coil;

[0007] In the case of abnormal mains power supply, if the control module detects a function power start signal, the DC-DC converter is started so that the standby battery of the device supplies power to the device control system through the DC-DC converter; if the control module detects a brake release power start signal, the connection between the first end of the power supply circuit and the brake coil is conducted through the switching component, and the power supply circuit is controlled to supply power to the brake coil.

[0008] In one embodiment, when the mains power supply is normal, the control module controls the power supply circuit to step down the mains bus voltage to supply power to the standby battery of the device; the control module controls the power supply circuit to step up the voltage of the standby battery of the device to supply power to the brake coil;

[0009] In the case of abnormal mains power supply, the control module controls the power supply circuit to step up the voltage of the standby battery of the device to supply power to the brake coil.

[0010] In one embodiment, the switching component includes a switching relay connected to the control module; the control module controls the switching relay to connect the corresponding contacts to turn on and off the connection between the first end of the power supply circuit and the mains power supply interface, and turn on and off the connection between the first end of the power supply circuit and the brake coil.

[0011] In one embodiment, the power supply circuit includes a switching component and an energy storage unit;

[0012] The control end of the switching component is connected to the control module, and the control module is used to control the on-off sequence of the corresponding switches in the switching component to step down the mains bus voltage and step up the voltage of the standby battery of the device; one end of the energy storage unit is connected to the mains power supply interface through the switching component, and the other end is used to connect to the brake coil through the standby battery of the device and is used to connect to the device control system through the DC-DC converter.

[0013] In one embodiment, the switching component includes a first MOS transistor and a second MOS transistor, and the energy storage unit is an inductor;

[0014] The source electrode of the first MOS transistor is respectively connected to the mains power supply interface and the brake coil through the switching component, the drain electrode of the first MOS transistor is respectively connected to one end of the inductor and the drain electrode of the second MOS transistor, and the gate electrode of the first MOS transistor is connected to the control module; the drain electrode of the second MOS transistor is connected to one end of the inductor, the gate electrode of the second MOS transistor is connected to the control module, and the source electrode of the second MOS transistor is used to connect to one end of the standby battery of the device; the other end of the inductor is used to connect to the other end of the standby battery of the device.

[0015] In one embodiment, the circuit further includes a system auxiliary power source and a mains detection unit; one end of the system auxiliary power source is used to connect to the device backup battery, and the other end is connected to the control module; one end of the mains detection unit is used to connect to the mains power supply interface, and the other end is connected to the control module;

[0016] The control module is used to determine whether the mains power supply is normal or abnormal through the mains detection unit.

[0017] In one embodiment, the circuit further includes a filter circuit and a rectifier circuit;

[0018] The input end of the filter circuit is used to connect to the mains power supply interface, and the output end of the filter circuit is connected to the input end of the rectifier circuit; the output end of the rectifier circuit is connected to the first end of the power supply loop through a switching component.

[0019] In one embodiment, the rectifier circuit is a rectifier bridge; the filter circuit is an EMI filter circuit;

[0020] The input end of the EMI filter circuit is connected to the mains power supply interface, one output end of the EMI filter circuit is connected to the first input pole of the rectifier bridge, and the other output end is connected to the second input pole of the rectifier bridge; the first output pole of the rectifier bridge is connected to the first end of the power supply loop through a switching component, and the second output pole of the rectifier bridge is used to connect to the brake coil and is used to connect to the device control system through a DC-DC converter.

[0021] In a second aspect, the present application further provides an emergency brake release power supply device, and the emergency brake release power supply device includes the above-mentioned emergency brake release power supply circuit; the emergency brake release power supply device further includes a brake coil, a DC-DC converter, a device control system, and a device backup battery;

[0022] The first end of the power supply loop is connected to the mains power supply interface and is connected to the brake coil, and the second end of the power supply loop is connected to the brake coil through the device backup battery and is connected to the device control system through the DC-DC converter.

[0023] In one embodiment, the emergency brake release power supply circuit further includes an electrolytic capacitor; the rectifier circuit is a rectifier bridge;

[0024] The positive electrode of the electrolytic capacitor is connected to the first output pole of the rectifier bridge, and the negative electrode of the electrolytic capacitor is connected to the second output pole of the rectifier bridge.

[0025] For the above-mentioned emergency brake release power supply circuit and equipment, the control module conducts the connection between the power supply loop and the corresponding interface equipment through the switching component. Furthermore, when the mains power supply is normal, the control module controls the power supply loop to supply power to the equipment backup battery, and when the function power supply start signal is detected, the power supply loop provides power to the equipment control system through the DC-DC converter, and when the brake release power supply start signal is detected, the control module controls the power supply loop to supply power to the brake coil; further, when the mains power supply is abnormal, if the function power supply start signal is detected, the control module starts the DC-DC converter so that the equipment backup battery provides power to the equipment control system through the DC-DC converter; if the brake release power supply start signal is detected, the control module controls the power supply loop to supply power to the brake coil through the equipment backup battery. Thus, the present application simplifies the circuit, realizes cost reduction through circuit multiplexing and normalization, saves a lot of analog chips based on the present application, and can achieve digital control with a simpler control logic. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0027] Figure 1 It is a structural block diagram of a traditional emergency brake release power supply circuit;

[0028] Figure 2 It is a schematic diagram of a traditional emergency brake release power supply circuit;

[0029] Figure 3 It is a brake type diagram of a traditional emergency brake release power supply;

[0030] Figure 4 It is a structural block diagram of an emergency brake release power supply circuit in one embodiment;

[0031] Figure 5 It is a structural block diagram of an emergency brake release power supply circuit in another embodiment;

[0032] Figure 6 It is a circuit block diagram of an emergency brake release power supply circuit in one embodiment;

[0033] Figure 7 It is a schematic diagram of a system auxiliary power source and mains power detection unit in an emergency brake release power supply circuit in one embodiment;

[0034] Figure 8Schematic diagram of a filter rectifier circuit in an emergency brake release power supply circuit in an embodiment;

[0035] Figure 9 Circuit block diagram of an emergency brake release power supply device in an embodiment. Detailed implementation manners

[0036] For ease of understanding the present application, the present application will be described more comprehensively below with reference to the relevant drawings. Embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the description of this application herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0038] It can be understood that the terms "first", "second", etc. used in this application can be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first resistor can be called a second resistor, and similarly, a second resistor can be called a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0039] It can be understood that in the following embodiments, "connection", if there is an electrical signal or data transfer between the connected circuits, modules, units, etc., should be understood as "electrical connection", "communication connection", etc.

[0040] As used herein, the singular forms "a", "an" and "the" may also include the plural forms unless the context clearly dictates otherwise. It should also be understood that the terms "comprising", "including" or "having", etc. specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0041] Such as Figure 1As shown in the figure, the traditional emergency brake release power supply adopts an independent power supply. The power supply circuit of the power supply and the battery circuit form a 1+1 backup through a combining control (charge and discharge relay), and provide power for the device control system (for example, the elevator control system) through a DC-DC converter. The DC-DC converter still basically adopts a high-cost isolated converter, and the basic circuit topology still adopts a flyback circuit. The startup of the circuit is triggered by an external control signal RUN1 (the function power startup button is pressed). In addition, the brake release power supply circuit adopts a 1+1 backup form of the mains mode and the battery mode. At present, the DC-DC part of the mains mode still adopts a high-cost isolated converter. According to the brake power characteristics on the market, topologies such as dual-switch forward, dual-switch flyback, half-bridge or full-bridge are basically adopted. The DC-DC part of the battery mode also adopts a high-cost isolated converter, and topologies such as push-pull and full-bridge are basically adopted. The startup of the circuit is triggered by an external control signal RUN2 (the brake release power startup button is pressed). As Figure 2 shown, in the traditional emergency brake release power supply circuit, the cumbersome circuit structure greatly increases the cost of components.

[0042] Furthermore, as Figure 3 shown, the traditional emergency brake release power supply is also limited by the duty cycle of the converter control chip (transformer turns ratio) and the increasing variety of brakes (the variety of brakes is related to the opening current). For the same elevator manufacturer, there are often many types of brake release power supplies, and the material cost and management cost consumption are very large.

[0043] The present application relates to an emergency brake release power supply circuit and device. While fully compatible with all functions of the existing scheme, it realizes the digital control of the brake release power supply, making the control logic simpler; streamlines the circuit, and realizes cost reduction through circuit reuse and normalization. At the same time, based on the present application, a lot of analog chips are saved, and the brake release power supply circuit realizes digital control, and the control logic is simpler.

[0044] The emergency brake release power supply circuit provided by the embodiment of the present application can be applied to an elevator system. In one embodiment, an emergency brake release power supply circuit is provided, and the circuit may include: a control module 410, a switching component 420, and a power supply loop 430;

[0045] The control module 410 is respectively connected to the control end of the switching component 420 and the control end of the power supply loop 430; the control module 410 is used to monitor the function power startup signal and the brake release power startup signal; wherein, the first end of the power supply loop 430 is used to connect to the mains power supply interface and to connect to the brake coil, and the second end of the power supply loop 430 is used to connect to the brake coil through the device backup battery and to connect to the device control system through a DC-DC converter;

[0046] When the commercial power supply is normal, the control module 410 controls the connection between the first end of the power supply circuit 430 and the commercial power supply interface to be conducted through the switching component 420, and controls the power supply circuit 430 to supply power to the device backup battery; when the control module 410 monitors the function power start signal, it starts the DC-DC converter so that the power supply circuit 430 supplies power to the device control system through the DC-DC converter; when the control module 410 monitors the brake release power start signal, it controls the connection between the first end of the power supply circuit 430 and the brake coil to be conducted through the switching component 420, and controls the power supply circuit 430 to supply power to the brake coil.

[0047] When the commercial power supply is abnormal, if the control module 410 monitors the function power start signal, it starts the DC-DC converter so that the device backup battery supplies power to the device control system through the DC-DC converter; if the control module 410 monitors the brake release power start signal, it controls the connection between the first end of the power supply circuit 430 and the brake coil to be conducted through the switching component 420, and controls the power supply circuit 430 to supply power to the brake coil.

[0048] Specifically, the commercial power supply interface can refer to the interface for receiving commercial power input. As Figure 4 shown, when the commercial power supply is normal, the power supply circuit 430 is connected to the commercial power supply interface through the switching component 420 to receive commercial power input, so as to supply power to the device backup battery. At the same time, the control module 410 synchronously monitors whether there is a function power start signal and a brake release power start signal. The DC-DC converter starts only when it monitors the function power start signal. When the control module 410 monitors the brake release power start signal, the power supply circuit 430 receives commercial power input through the switching component 420 to supply power to the brake coil; when the commercial power supply is abnormal, there is no commercial power input, and the device backup battery is relied on for power supply. Similarly, the DC-DC converter starts only when it monitors the function power start signal.

[0049] Furthermore, the function power start signal can be understood as being issued when the function power start button (external button) is pressed, such as the control signal RUN1; exemplarily, the brake release power start signal can be understood as being issued when the brake release power start button (external button) is pressed, such as the control signal RUN2.

[0050] Compared with the traditional emergency brake release power supply, this application can save a commercial power brake release circuit and a charger, and it is expected to save more than 40% of the cost; if both the DC-DC converter and the device system power converter are non-isolated types, the cost reduction range will be greater.

[0051] In one embodiment, when the main power supply is normal, the control module controls the power supply circuit to step down the main power bus voltage to supply power to the equipment backup battery; the control module controls the power supply circuit to step up the voltage of the equipment backup battery to supply power to the brake coil.

[0052] When the main power supply is abnormal, the control module controls the power supply circuit to step up the voltage of the equipment backup battery to supply power to the brake coil.

[0053] Specifically, when the main power supply is normal, the control module controls the power supply circuit to step down the main power bus voltage to supply power to the equipment backup battery by switching on the connection between the first end of the power supply circuit and the main power supply interface through the switching component; when the main power supply is normal or abnormal, if the control module detects the signal to start the brake release power supply, it controls the power supply circuit to step up the voltage of the equipment backup battery to supply power to the brake coil by switching on the connection between the first end of the power supply circuit and the brake coil through the switching component.

[0054] In one embodiment, the power supply circuit 430 may include a switching component 510 and an energy storage unit 520;

[0055] The control end of the switching component is connected to the control module, and the control module is used to control the on-off sequence of the corresponding switches in the switching component 510 to step down the main power bus voltage and step up the voltage of the equipment backup battery; one end of the energy storage unit 520 is connected to the main power supply interface through the switching component 510, and the other end is used to be connected to the brake coil through the equipment backup battery and to be connected to the equipment control system through a DC-DC converter.

[0056] Specifically, as Figure 5 shown, the switching component 510 may be a component with a conduction function, such as a MOS transistor or a diode, and the energy storage unit may be a unit with an energy storage function, such as an inductor; further, in this application, the MOS transistor and the inductor are taken as examples for illustration.

[0057] In one embodiment, the switching component includes a first MOS transistor (Q1) and a second MOS transistor (Q2), and the energy storage unit is an inductor (L1);

[0058] The source electrode of the first MOS transistor (Q1) is respectively connected to the mains power supply interface and the brake coil through a switching component. The drain electrode of the first MOS transistor (Q1) is respectively connected to one end of an inductor (L1) and the drain electrode of a second MOS transistor (Q2). The gate electrode of the first MOS transistor (Q1) is connected to a control module. The drain electrode of the second MOS transistor (Q2) is connected to one end of the inductor (L1). The gate electrode of the second MOS transistor (Q2) is connected to the control module. The source electrode of the second MOS transistor (Q2) is used to connect to one end of a device backup battery. The other end of the inductor (L1) is used to connect to the other end of the device backup battery.

[0059] Specifically, as Figure 6 shown, when the mains power supply is normal, the connection between the first end of the power supply circuit and the mains power supply interface is conducted through the switching component, and the emergency brake release power supply circuit enters the mains power supply mode. The control module controls the first MOS transistor (Q1) to conduct first. After the first MOS transistor (Q1) is turned off, the freewheeling second MOS transistor (Q2) conducts, so as to control the power supply circuit to step down the mains bus voltage and supply power to the device backup battery. When the control module detects the function power supply start signal (RUN1), it starts the DC-DC converter. The control module controls the power supply circuit to step down the mains bus voltage and supply power to the device backup battery while supplying power to the DC-DC converter. When the control module detects the brake release power supply start signal (RUN2), it conducts the connection between the first end of the power supply circuit and the brake coil through the switching component, and the emergency brake release power supply circuit enters the battery mode. The control module controls the second MOS transistor (Q2) to conduct first, and then conducts the first MOS transistor (Q1), so as to control the first power supply circuit to step up the voltage of the device backup battery and supply power to the brake coil. When the mains power supply is abnormal, if the control module detects the function power supply start signal (RUN1), it starts the DC-DC converter so that the power supply circuit provides power to the device control system through the DC-DC converter. If the control module detects the brake release power supply start signal (RUN2), it conducts the connection between the first end of the power supply circuit and the brake coil through the switching component, and the emergency brake release power supply circuit enters the battery mode. The control module controls the second MOS transistor (Q2) to conduct first, and then conducts the first MOS transistor (Q1), so as to control the power supply circuit to step up the voltage of the device backup battery and supply power to the brake coil. Among them, the control module is signal-connected to the switching component (as shown by the arrow in the figure), and the gate electrodes of the first MOS transistor and the second MOS transistor are both connected to the control module (not shown in the figure).

[0060] Furthermore, both the first MOS transistor and the second MOS transistor are NMOS transistors. The control module can be a chip with control functions, such as a CPU or an MCU. In this application, the MCU is taken as an example for illustration.

[0061] It should be noted that the MCU (Microcontroller Unit), also known as a single-chip microcomputer or a microcontroller, is a computer-on-a-chip that appropriately reduces the frequency and specifications of the central processing unit and integrates peripheral interfaces such as memory, counters, USB (Universal Serial Bus), A / D conversion (analog-to-digital conversion), UART (Universal Asynchronous Receiver / Transmitter), PLC (Programmable Logic Controller), DMA (Direct Memory Access), and even the LCD (Liquid Crystal Display) driver circuit on a single chip to perform different combined controls for different application scenarios.

[0062] Thanks to the application of digital power supplies, this application uses an MCU for sampling and closed-loop control. The MCU can achieve a duty cycle of 0 to 100%, greatly increasing the one-to-many characteristics of the brake release power supply, and realizing automatic adjustment over a wide current range and a wide voltage range. In addition, this application greatly simplifies the brake release power supply circuit. A streamlined circuit is used to meet the specific circuit requirements. Through this application, the charger circuit and the brake release circuit are shared, and the mains mode and the battery mode architectures are normalized, reducing costs.

[0063] In one embodiment, the switching component includes a switching relay connected to the control module; the control module controls the switching relay to connect the corresponding contacts to switch the connection between the first end of the power supply circuit and the mains power supply interface (S2), and to switch the connection between the first end of the power supply circuit and the brake coil (S1).

[0064] Specifically, a relay can refer to an automatic switching element with isolation function. Further, a relay includes an electromagnetic system and a contact system. The electromagnetic system consists of a coil, a fixed iron core, and a movable armature, and the contact system consists of a moving contact and a stationary contact. When the input of the coil of the relay electromagnetic system reaches the threshold, under the electromagnetic action, the iron core generates a magnetic force to attract the armature, and the armature drives the moving contact of the contact system to move, closing or opening the contacts, thereby changing the on / off state of the circuit connected by the contact system. According to the change of the input of the electromagnetic system coil, the on / off of the contacts is controlled. When the coil input reaches the threshold, the normally open contacts will close and the normally closed contacts will open, thus changing the working state of the circuit connected by the contacts. In this application, a switching relay is taken as an example for illustration, where S1 and S2 can be implemented using corresponding contact types.

[0065] Further, as Figure 6 shown, when the mains power supply is normal, the control module controls the power supply circuit to step down the mains bus voltage through the switching component to conduct S2 to supply power to the standby battery of the device; when the control module detects the function power start signal, the DC-DC converter is started so that the power supply circuit provides power to the device control system through the DC-DC converter, that is, while the control module supplies power to the standby battery of the device through the switching component, the control module controls the power supply circuit to step down the mains bus voltage through the switching component to conduct S2 to supply power to the DC-DC converter; when the control module detects the brake release power start signal, S1 is conducted through the switching component, and the control power supply circuit supplies power to the brake coil through the standby battery of the device.

[0066] In the case of abnormal mains power supply, if the control module detects the function power start signal (RUN1), the DC-DC converter is started so that the standby battery of the device provides power to the device control system through the DC-DC converter. When the control module detects the brake release power start signal (RUN2), S1 is conducted through the switching component, and the control power supply circuit supplies power to the brake coil through the standby battery of the device.

[0067] In one embodiment, the circuit further includes a system auxiliary power source and a mains power detection unit; one end of the system auxiliary power source is used to connect to the standby battery of the device, and the other end is connected to the control module; one end of the mains power detection unit is used to connect to the mains power supply interface, and the other end is connected to the control module;

[0068] The control module is used to judge whether the mains power supply is normal or abnormal through the mains power detection unit.

[0069] Specifically, as Figure 7 shown, the system auxiliary power source draws power from the standby battery of the device and outputs 12V and 5V through a linear IC (Integrated Circuit Chip, microelectronic device). The 12V powers the conventional chip and other ICs, and the 5V flows into the MCU. The system auxiliary power source is signal-connected to the MCU (the arrow in the figure indicates) to supply power to the MCU. Among them, a suitable linear IC needs to be selected according to the actual situation; the mains power detection unit can also be used to detect the mains power supply situation, and the MCU can judge whether the mains power supply is normal or abnormal through the mains power detection unit.

[0070] In one embodiment, the circuit further includes a filter circuit and a rectifier circuit;

[0071] The input end of the filter circuit is used to connect to the mains power supply interface, and the output end of the filter circuit is connected to the input end of the rectifier circuit; the output end of the rectifier circuit is connected to the first end of the power supply circuit through the switching component.

[0072] Specifically, a filter circuit may refer to a circuit that only allows signal components within a certain frequency range to pass through normally while blocking other frequency components. For example, an EMI filter circuit; a rectifier circuit may refer to a circuit that converts alternating current electrical energy into direct current electrical energy. For example, a rectifier bridge, a half-wave rectifier circuit. This application will be described by taking an EMI filter circuit and a rectifier bridge as examples.

[0073] In one embodiment, the rectifier circuit is a rectifier bridge; the filter circuit is an EMI filter circuit;

[0074] The input end of the EMI filter circuit is connected to the mains power supply interface. One output end of the EMI filter circuit is connected to the first input pole of the rectifier bridge, and the other output end is connected to the second input pole of the rectifier bridge; the first output pole of the rectifier bridge is connected to the first end of the power supply loop through a switching component, and the second output pole of the rectifier bridge is used to connect to the brake coil and to connect to the equipment control system through a DC-DC converter.

[0075] Specifically, as Figure 8 shown, the EMI filter circuit is provided with two input ends and two output ends, and has the function of effectively suppressing power grid noise, improving the anti-interference ability of electronic equipment and the reliability of the system; the rectifier bridge is provided with a first input pole and a second input pole for connecting to an AC input power supply, and a first output pole and a second output pole for outputting direct current. The rectifier bridge is used to convert alternating current into direct current.

[0076] In one embodiment, this application also provides an emergency brake release power supply device. The emergency brake release power supply device includes the above-mentioned emergency brake release power supply circuit; the emergency brake release power supply device further includes a brake coil, a DC-DC converter, an equipment control system, and an equipment backup battery;

[0077] The first end of the power supply loop is connected to the mains power supply interface and to the brake coil. The second end of the power supply loop is connected to the brake coil through the equipment backup battery and to the equipment control system through the DC-DC converter.

[0078] Specifically, the emergency brake release power supply device may refer to a machine-roomless elevator, which is equipped with an emergency brake release power supply for leveling and releasing passengers in case of elevator abnormalities; furthermore, based on the embodiments of this application, an emergency brake release power supply circuit can be configured for this machine-roomless elevator;

[0079] Exemplarily, the equipment control system may refer to an elevator control system. Furthermore, the emergency brake release power supply circuit in the embodiments of this application can supply power to the power supply of the elevator control system.

[0080] In one embodiment, the emergency brake release power supply circuit further includes an electrolytic capacitor; the rectifier circuit is a rectifier bridge;

[0081] The positive electrode of the electrolytic capacitor is connected to the first output terminal of the rectifier bridge, and the negative electrode of the electrolytic capacitor is connected to the second output terminal of the rectifier bridge.

[0082] As described above, as Figure 9 shown, in the embodiments of the present application and the previous embodiment, the circuit is applied to the emergency brake release power supply device for illustration. While the present application is fully compatible with all the functions of the existing solutions, it realizes the digital control of the brake release power supply, making the control logic simpler; simplifies the circuit, and through the reuse and normalization of the circuit, the cost is reduced. Based on the present application, a lot of analog chips are saved. At the same time, due to the full coverage of the duty cycle of the MCU, the possibility of one-to-many brakes can be realized, thereby reducing the management cost of the brake release power supply. The brake release power supply circuit realizes digital control, and the control logic is simpler.

[0083] In the description of this specification, the descriptions referring to terms such as "some embodiments", "other embodiments", "ideal embodiments", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0084] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0085] The above-described embodiments only represent several implementation manners of the present invention. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent should be subject to the appended claims.

Claims

1. An emergency power-off brake power circuit, characterized in that, The circuit includes: a control module, a switching component, and a power supply loop; the control module is respectively connected to the control end of the switching component and the control end of the power supply loop; the control module is used to monitor the function power supply start signal and the brake release power supply start signal; wherein, the first end of the power supply loop is used to connect to the mains power supply interface or the brake coil, and the second end of the power supply loop is used to connect to the equipment backup battery and a DC-DC converter. When the mains power supply is normal, the control module conducts the connection between the first end of the power supply loop and the mains power supply interface through the switching component, and controls the power supply loop to step down the mains bus voltage to supply power to the equipment backup battery; when the control module monitors the function power supply start signal, it starts the DC-DC converter so that the power supply loop provides power to the equipment control system through the DC-DC converter; when the control module monitors the brake release power supply start signal, it conducts the connection between the first end of the power supply loop and the brake coil through the switching component, and controls the power supply loop to step up the voltage of the equipment backup battery to supply power to the brake coil. When the mains power supply is abnormal, if the control module monitors the function power supply start signal, it starts the DC-DC converter so that the equipment backup battery provides power to the equipment control system through the DC-DC converter; if the control module monitors the brake release power supply start signal, it conducts the connection between the first end of the power supply loop and the brake coil through the switching component, and controls the power supply loop to step up the voltage of the equipment backup battery to supply power to the brake coil.

2. The emergency brake release power supply circuit according to claim 1, characterized in that, The switching component includes a switching relay connected to the control module; the control module controls the switching relay to connect the corresponding contacts to switch on and off the connection between the first end of the power supply loop and the mains power supply interface, and to switch on and off the connection between the first end of the power supply loop and the brake coil.

3. The emergency brake release power supply circuit according to claim 1 or 2, characterized in that The power supply loop includes a switch component and an energy storage unit. The control end of the switch component is connected to the control module, and the control module is used to control the on-off sequence of the corresponding switch in the switch component to step down the mains bus voltage and to step up the voltage of the equipment backup battery; one end of the energy storage unit is connected to the mains power supply interface through the switch component, and the other end is used to connect to the brake coil through the equipment backup battery and to connect to the equipment control system through the DC-DC converter.

4. The emergency brake release power supply circuit according to claim 3, wherein, The switch component includes a first MOS transistor and a second MOS transistor, and the energy storage unit is an inductor. The source electrode of the first MOS transistor is respectively connected to the mains power supply interface and the brake coil through the switching component. The drain electrode of the first MOS transistor is respectively connected to one end of the inductor and the drain electrode of the second MOS transistor. The gate electrode of the first MOS transistor is connected to the control module. The drain electrode of the second MOS transistor is connected to one end of the inductor. The gate electrode of the second MOS transistor is connected to the control module. The source electrode of the second MOS transistor is used to connect to one end of the device backup battery. The other end of the inductor is used to connect to the other end of the device backup battery.

5. The emergency brake release power supply circuit according to claim 1, characterized in that, The circuit further includes a system auxiliary power source and a mains power detection unit. One end of the system auxiliary power source is used to connect to the device backup battery, and the other end is connected to the control module. One end of the mains power detection unit is used to connect to the mains power supply interface, and the other end is connected to the control module. The control module is used to judge whether the mains power supply is normal or abnormal through the mains power detection unit.

6. The emergency brake release power supply circuit according to claim 1, characterized in that, The circuit further includes a filter circuit and a rectifier circuit. The input end of the filter circuit is used to connect to the mains power supply interface, and the output end of the filter circuit is connected to the input end of the rectifier circuit. The output end of the rectifier circuit is connected to the first end of the power supply circuit through the switching component.

7. The emergency brake release power circuit according to claim 6, wherein The rectifier circuit is a rectifier bridge. The filter circuit is an EMI filter circuit. The input end of the EMI filter circuit is connected to the mains power supply interface. One output end of the EMI filter circuit is connected to the first input pole of the rectifier bridge, and the other output end is connected to the second input pole of the rectifier bridge. The first output pole of the rectifier bridge is connected to the first end of the power supply circuit through the switching component. The second output pole of the rectifier bridge is used to connect to the brake coil and is used to connect to the device control system through a DC-DC converter.

8. An emergency power supply device for releasing brakes, characterized in that, It includes the emergency brake release power circuit according to any one of claims 1 to 7. It further includes a brake coil, a DC-DC converter, a device control system and a device backup battery. The first end of the power supply circuit is connected to the mains power supply interface and is connected to the brake coil. The second end of the power supply circuit is connected to the brake coil through the device backup battery and is connected to the device control system through the DC-DC converter.

9. The emergency brake release power supply device according to claim 8, wherein The emergency brake release power circuit further includes an electrolytic capacitor and a rectifier circuit. The rectifier circuit is a rectifier bridge. The positive electrode of the electrolytic capacitor is connected to the first output pole of the rectifier bridge, and the negative electrode of the electrolytic capacitor is connected to the second output pole of the rectifier bridge.

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