Energy-saving structure of elevator

Abstract

The utility model provides an energy-saving structure of an elevator, which can solve the problem of voltage imbalance, improve the operation efficiency of the elevator and save electric energy. Comprising a super capacitor bank, a plurality of single voltage balancing modules, a resistor R1, an MOS tube Q1 and a controller, the super capacitor bank comprises super capacitors C1-Cn, the super capacitors C1-Cn are sequentially connected in series, the number of the single voltage balancing modules corresponds to the number of the super capacitors, the single voltage balancing modules adopt bidirectional DCDC converters, and the single voltage balancing modules are connected with the MOS tube Q1. The output ends of the single voltage balancing modules are sequentially and correspondingly connected to the two ends of the super capacitors C1-Cn, the input ends of the multiple single voltage balancing modules are connected in parallel and then connected to the input end IN1 of the controller, one end of the resistor R1 is connected with one end of the super capacitor bank and the controller, the other end of the resistor R1 is connected with the controller and the drain electrode of the MOS tube Q1, and the other end of the resistor R1 is connected with the drain electrode of the MOS tube Q1. The grid electrode of the MOS tube Q1 is connected to the controller, the source electrode of the MOS tube Q1 is connected to the positive electrode end of the direct current bus, and the other end of the super capacitor bank is connected to the negative electrode end of the direct current bus.

Description

Technical Field

[0001] This utility model relates to the field of elevator equipment technology, specifically to an energy-saving elevator structure. Background Technology

[0002] With the increasing use of elevators, surveys of electricity consumption in hotels, office buildings, and other establishments show that elevators account for 17%-25% of total electricity consumption, second only to air conditioning and exceeding that of lighting and water supply. As modern production scales continue to expand and people's living standards improve, the contradiction between electricity supply and demand is becoming increasingly prominent, and the call for energy conservation is growing louder. Therefore, saving electricity has particularly important social significance and economic benefits, and the elevator industry is actively exploring energy-saving technologies.

[0003] Capacitor-based elevator energy-saving technology has seen some development in recent years. It works by storing and reusing electrical energy in capacitors during elevator operation, and then releasing this energy when needed to reduce elevator energy consumption. However, due to the low voltage of a single capacitor, multiple capacitors are usually connected in series to form a capacitor bank. But due to limitations in the manufacturing process, it is difficult to make the capacitance of each capacitor completely consistent. Even if they are strictly matched at the factory, the capacitance will change during use, resulting in voltage imbalance between different individual capacitors. This not only shortens the lifespan of individual capacitors but also fails to improve elevator operating efficiency, thus failing to achieve the goal of energy saving. Utility Model Content

[0004] Based on the above, this utility model provides an energy-saving elevator structure that can solve the problems mentioned in the background art, overcome the shortcomings of the existing technology, solve the problem of voltage imbalance, improve elevator operating efficiency, and save energy.

[0005] This utility model adopts the following technical solution: an elevator energy-saving structure, comprising a supercapacitor bank, several individual voltage equalization modules, a resistor R1, a MOSFET Q1, and a controller. The supercapacitor bank includes supercapacitors C1 to Cn, which are connected in series. The number of individual voltage equalization modules corresponds to the number of supercapacitors. Each individual voltage equalization module uses a bidirectional DC-DC converter. The output terminals of several individual voltage equalization modules are sequentially connected to the two ends of the supercapacitors C1 to Cn. The input terminals are connected in parallel to the input terminal IN1 of the controller. One end of the resistor R1 is connected to one end of the supercapacitor bank and the input terminal IN2 of the controller. The other end of the resistor R1 is connected to the input terminal IN3 of the controller and the drain of the MOSFET Q1. The gate of the MOSFET Q1 is connected to the input terminal IN4 of the controller. The source of the MOSFET Q1 is connected to the positive terminal of the DC bus of the elevator inverter. The other end of the supercapacitor bank is connected to the negative terminal of the DC bus of the elevator inverter. The controller is connected to the elevator inverter through a communication interface.

[0006] Furthermore, it also includes a power supply module and a temperature sampling module, wherein the power supply module is connected to the controller and is used to provide a 5V power supply voltage;

[0007] The temperature sampling module is connected to the controller and is installed in the elevator car. It is used to monitor the ambient temperature inside and outside the elevator car and transmit the data to the controller in real time.

[0008] Furthermore, the temperature sampling module uses an NTC temperature sensor, specifically the NTC104-F-3950 model temperature sensor.

[0009] Furthermore, the elevator frequency converter is connected to the power grid via a contactor. The elevator frequency converter includes a rectifier circuit and an inverter circuit connected in series. The output terminal of the inverter circuit is connected to the motor M. The source of the MOSFET Q1 is connected to the positive terminal of the DC bus between the rectifier circuit and the inverter circuit. The other end of the supercapacitor group is connected to the negative terminal of the DC bus between the rectifier circuit and the inverter circuit.

[0010] The beneficial effect of this utility model is that, through the elevator energy-saving structure composed of supercapacitor groups, the two ends of the supercapacitors C1 to Cn are connected to individual voltage equalization modules in sequence. During the operation of the elevator, these supercapacitors can be charged and discharged in a bidirectional conversion manner through the individual voltage equalization modules, thereby ensuring voltage balance. This not only solves the problem of voltage imbalance, but also improves the elevator operating efficiency and saves energy, thus having good application value. Attached Figure Description

[0011] Figure 1 This is a structural block diagram of the present invention;

[0012] Figure 2 This is the circuit schematic diagram of this utility model. Detailed Implementation

[0013] like Figure 1 , Figure 2 As shown, this utility model discloses an elevator energy-saving structure, which includes a supercapacitor bank, several individual voltage equalization modules, a resistor R1, a MOSFET Q1, and a controller. The supercapacitor bank includes supercapacitors C1 to Cn, which are connected in series. The number of individual voltage equalization modules corresponds to the number of supercapacitors. Each individual voltage equalization module uses a bidirectional DC-DC converter. The output terminals of several individual voltage equalization modules are connected sequentially to the two ends of supercapacitors C1 to Cn. The input terminals of several individual voltage equalization modules are connected in parallel and then connected to the input terminal IN1 of the controller to realize the overvoltage detection function. One end of the resistor R1 is connected to one end of the supercapacitor bank and the input terminal IN2 of the controller, and the other end of the resistor R1 is connected to the controller's input terminal IN2. The input terminal IN3 and the drain of MOSFET Q1 are connected together. The two ends of resistor R1 are connected to the controller to achieve current sampling. The gate of MOSFET Q1 is connected to the input terminal IN4 of the controller, and the source of MOSFET Q1 is connected to the positive terminal DC bus DC+ of the elevator inverter. The other end of the supercapacitor bank is connected to the negative terminal DC bus DC- of the elevator inverter. The controller is connected to the elevator inverter through a communication interface (i.e., CAN or 485 interface). Therefore, the controller can read the actual current of the elevator inverter, calculate the actual output torque of the motor, and calculate the actual load weight of the elevator, thereby controlling the elevator more reasonably. The controller's calculation and control of the elevator is existing technology. The controller can use existing CMS or STM32 microcontroller.

[0014] It also includes a power supply module and a temperature sampling module. The power supply module is connected to the controller and is used to provide a 5V power supply voltage.

[0015] The temperature sampling module, connected to the controller and installed inside the elevator car, monitors the ambient temperature inside and outside the elevator car and transmits the data to the controller in real time. The temperature sampling module uses an NTC temperature sensor, specifically an NTC104-F-3950 model. Four NTC temperature sensors are provided. Figure 2 The NTCs are located in different positions inside and outside the car.

[0016] The elevator frequency converter is connected to the power grid via a contactor. The elevator frequency converter includes a rectifier circuit and an inverter circuit connected together. The output terminal of the inverter circuit is connected to the motor M. The controller is connected to the inverter circuit. The motor M is connected to the elevator car drive. The source of the MOSFET Q1 is connected to the positive terminal of the DC bus between the rectifier circuit and the inverter circuit. The other end of the supercapacitor group is connected to the negative terminal of the DC bus between the rectifier circuit and the inverter circuit. The power supply module, rectifier circuit, and inverter circuit all use existing circuit modules.

[0017] In this invention, when the elevator inverter is in braking mode, the DC bus voltage of the inverter increases. At this time, the individual voltage balancing module will charge the corresponding supercapacitor according to the settings, thus recovering braking energy. The individual voltage balancing module also performs bidirectional switching. When the voltage of a supercapacitor is unbalanced, the module charges and discharges the corresponding supercapacitor in a bidirectional manner, transferring energy from the supercapacitor with excess energy to the supercapacitor with insufficient energy. When the elevator inverter is in energy-consuming mode, the DC bus voltage decreases. At this time, the individual voltage balancing module will operate according to the settings, discharging the inverter and releasing the energy stored in the supercapacitor. In summary, this invention enables more rational utilization of the energy stored in the supercapacitor during elevator operation, thus not only solving the problem of voltage imbalance but also improving elevator operating efficiency and saving energy.

[0018] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0019] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An energy-saving structure for elevators, characterized in that: It includes a supercapacitor bank, several individual voltage equalization modules, a resistor R1, a MOSFET Q1, and a controller. The supercapacitor bank includes supercapacitors C1 to Cn, which are connected in series. The number of individual voltage equalization modules corresponds to the number of supercapacitors. Each individual voltage equalization module uses a bidirectional DC-DC converter. The output terminals of several individual voltage equalization modules are connected sequentially to the two ends of supercapacitors C1 to Cn. The input terminals of several individual voltage equalization modules are connected in parallel and then connected to the input terminal IN1 of the controller. One end of the resistor R1 is connected to one end of the supercapacitor bank and one input terminal IN2 of the controller. The other end of the resistor R1 is connected to the input terminal IN3 of the controller and the drain of MOSFET Q1. The gate of MOSFET Q1 is connected to the input terminal IN4 of the controller. The source of MOSFET Q1 is connected to the positive terminal of the DC bus of the elevator inverter. The other end of the supercapacitor bank is connected to the negative terminal of the DC bus of the elevator inverter. The controller is connected to the elevator inverter through a communication interface.

2. The elevator energy-saving structure according to claim 1, characterized in that: It also includes a power supply module and a temperature sampling module, wherein the power supply module is connected to the controller and is used to provide a 5V power supply voltage; The temperature sampling module is connected to the controller and is installed in the elevator car. It is used to monitor the ambient temperature inside and outside the elevator car and transmit the data to the controller in real time.

3. The elevator energy-saving structure according to claim 2, characterized in that: The temperature sampling module uses an NTC temperature sensor, specifically the NTC104-F-3950 model.

4. The elevator energy-saving structure according to claim 1, characterized in that: The elevator frequency converter is connected to the power grid via a contactor. The elevator frequency converter includes a rectifier circuit and an inverter circuit connected together. The output terminal of the inverter circuit is connected to the motor M. The source of the MOS transistor Q1 is connected to the positive terminal of the DC bus between the rectifier circuit and the inverter circuit. The other end of the supercapacitor group is connected to the negative terminal of the DC bus between the rectifier circuit and the inverter circuit.

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