Sleep control architecture and method of energy storage type energy-saving system

Abstract

The invention relates to a dormancy control framework and method of an energy storage type energy-saving system, the dormancy control framework is used for elevator machine room energy control, the dormancy control framework comprises a DC-DC module and an energy storage module, the DC-DC module is of an active driving type, and a strong current part of the DC-DC module absorbs electric energy of a direct current bus of a frequency converter of an elevator and stores the electric energy to the energy storage module; a weak current part of the DC-DC module takes power from the energy storage module, and the DC-DC module is at least provided with an auxiliary unit used for controlling the DC-DC module to be in a dormant state; the system further comprises a dormancy control module, the dormancy control module is at least provided with a first power supply line with energy coming from the direct-current bus, the dormancy control module comprises a controller and a sensing unit, the sensing unit is used for monitoring the power state of the direct-current bus, and the controller is coupled with the sensing unit and the auxiliary unit. And the control module is used for outputting a control signal for controlling the DC-DC module to sleep according to the DC bus power state.

Description

Technical Field

[0001] The present invention relates to the energy control of an elevator machine room, and particularly to a sleep control architecture and method for an energy storage type energy-saving system. Background Art

[0002] Currently, for a supercapacitor energy storage type system or an energy-saving system with other storage media, the DC-DC module needs to be powered by an additional 220Vac connection, which brings two problems: 1. Additional wiring is required, and the elevator machine room needs to provide a socket for 220Vac power supply, resulting in increased costs due to the additional wiring; 2. Taking power from 220Vac will cause additional power grid losses, and this part of the losses cannot be counted into the power savings. Summary of the Invention

[0003] To solve the problems existing in taking power from an external 220Vac, the DC-DC module of the energy storage type energy-saving system is changed to take power from the battery side. When the DC-DC module of the energy-saving system takes power from the battery side, the energy consumed by the DC-DC module itself comes from the battery, which will cause two problems: 1. The battery capacity is limited. When there are no users using the elevator at night, the battery power will be continuously consumed and drop to the lower limit protection voltage of the battery, causing the energy-saving system to stop working. 2. When the customer does not use the elevator, the DC-DC module is also always in the working state. Calculated based on the power consumption of the DC-DC module in the working state being 25W, and the time when the elevator is not used every day being 8 hours, the wasted electric energy is 0.2KWH.

[0004] Based on this, the present invention intends to further solve the problem of idle power consumption of the battery caused while solving the problem of taking power from an external connection of the DC-DC module.

[0005] The sleep control architecture of the energy storage type energy-saving system of the present invention is used for elevator machine room energy control, and includes a DC-DC module and an energy storage module. The DC-DC module is of an active drive type. The strong power part of the DC-DC module absorbs the electric energy of the DC bus of the elevator frequency converter and stores it in the energy storage module. The weak power part of the DC-DC module takes power from the energy storage module. The DC-DC module at least has an auxiliary unit for controlling it to enter the sleep state; it further includes a sleep control module. The sleep control module at least has a first power supply line whose energy comes from the DC bus. The sleep control module includes a controller and a sensing unit. The sensing unit is used to monitor the power state of the DC bus. The controller is respectively coupled to the sensing unit and the auxiliary unit, and is used to output a control signal for controlling the DC-DC module to enter the sleep state according to the power state of the DC bus.

[0006] Further, the DC-DC module is provided with an auxiliary power supply. The auxiliary power supply draws power from the energy storage module via an electronic control switch and converts it to supply the weak-current part of the DC-DC module as a power source. The controller is electrically connected to the controlled end of the electronic control switch to form an auxiliary power supply multiplexed as the auxiliary unit.

[0007] Further, the auxiliary power supply is provided with a second power supply line to supply power to the sleep control module.

[0008] Further, the electronic control switch is a relay. The normally open contact of the relay is connected in series to the line between the input end of the auxiliary power supply and the energy storage module, and the coil of the relay is controlled by the controller.

[0009] Further, the auxiliary power supply is a passive drive type conversion circuit.

[0010] Further, the energy storage module is a battery pack.

[0011] A preferred exemplary sleep control method for the energy storage type energy-saving system is also provided, which is applied to the above sleep control architecture. The sleep control module at least performs the following operation steps: monitoring the power data of the DC bus of the frequency converter, and judging the usage state of the elevator according to the power data; when it is monitored that the elevator has not been used for more than a set time, outputting a control signal to control the DC-DC module to enter the sleep state to the auxiliary unit, and when it is monitored that the elevator is in the usage state, controlling the auxiliary unit to wake up the DC-DC module.

[0012] Further, based on whether the auxiliary unit supplies power to the DC-DC module, it is used as a control method for controlling whether the DC-DC module works or not.

[0013] The judging the usage state of the elevator according to the power data further includes: judging that the elevator is not in use when the DC bus voltage of the frequency converter maintains a stable state based on the climbing rate and / or the descending rate of the DC bus voltage; and / or judging that the elevator is not in use when the DC bus voltage of the frequency converter is zero.

[0014] Further, when the power supply line supplies power to the sleep control module, control the sleep control module to be in the working state, otherwise control the sleep control module itself to enter the sleep state, and configure the sleep control module to use the voltage on the DC bus of the frequency converter as the wake-up signal.

[0015] By adding a sleep architecture to the energy-saving system, the loss of the system is 0.01W, and it can support standby for 50,000 - 100,000 hours. If the sleep function is not added, the loss of the DC-DC module during idle time is about 30W. The battery capacity of the energy-saving system is generally 0.5KWH - 1KWH, and the battery power will be exhausted in 13 hours to 30 hours. Description of the Drawings

[0016] Figure 1 Fig. shows the schematic diagram of the sleep control of the elevator energy storage energy-saving system of the present invention; Figure 2 Fig. shows the topology of the sleep control architecture. Specific embodiments

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. For the sake of clarity, many practical details will be described together in the following description. However, it should be understood that these practical details are not used to limit the present application. That is to say, in some embodiments of the present application, these practical details are not necessary. In addition, for the sake of simplifying the drawings, some conventional structures and components will be shown in the drawings in a simple schematic manner.

[0018] It should be noted that all directional indications such as up, down, left, right, front, back... in the embodiments of the present application are only used to explain the relative position relationship and movement conditions between components in a specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indications will also change accordingly.

[0019] In addition, in the present application, the descriptions such as "first" and "second" are only for descriptive purposes, and do not particularly refer to the order or sequence, nor are they used to limit the present application. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present application.

[0020] In order to further understand the inventive content, features and effects of the present application, the following embodiments are exemplified and described in detail with reference to the accompanying drawings.

[0021] Figure 1 Fig. shows the schematic diagram of the sleep control of the elevator energy storage energy-saving system of the present invention, Figure 2 Fig. shows the topology of the sleep control architecture. Refer to Figure 1 and Figure 2 , as an exemplary illustration, the energy-saving system with a sleep function includes three parts: DC-DC module 10, energy storage module 20, and sleep control module 30.

[0022] The DC-DC module 10 is of the active drive type and realizes high-efficiency and accurate voltage DC-DC conversion based on a control signal or an auxiliary power supply (such as a PWM signal, a dedicated drive IC, independent power supply). The high-power part of the DC-DC module 10 absorbs the electrical energy of the DC bus of the frequency converter and stores it in the energy storage module 20. The energy storage module 20 can adopt battery-type and / or capacitor-type energy storage devices. The low-power part of the DC-DC module 10 takes power from the energy storage module 20 to solve the problem of taking power from the external 220Vac. Since the power is taken from the battery side, the problem of using the limited power on the battery side needs to be studied and designed. To solve the above-mentioned extended problems, the DC-DC module 10 is at least provided with an auxiliary unit 11 for controlling it to enter the sleep state. The sleep control module 30 at least includes a controller 31 and a sensing unit 32. The controller 31 is implemented by an MCU to operate with low power supply. The first power supply line b of the sleep control module 30 takes power from the DC bus of the frequency converter. The sensing unit 32 is used to monitor the power state c of the DC bus, including: monitoring the magnitude of the DC bus voltage of the frequency converter, the rising rate of the DC bus voltage of the frequency converter, and the falling rate of the DC bus voltage of the frequency converter. The controller 31 is respectively coupled to the sensing unit 32 and the auxiliary unit 11, and is used to output a control signal for controlling the DC-DC module 10 to enter the sleep state according to the power state of the DC bus.

[0023] The sleep control module 30 determines whether there is someone using the elevator by monitoring the state of the bus voltage of the frequency converter. When it is monitored that the elevator has no one using it for more than 20 minutes, the sleep control module 30 makes a decision to let the DC-DC module 10 enter the sleep state, and sends it to the auxiliary unit 11 through the control signal d. After receiving the signal, the auxiliary unit 11 turns off the DC-DC module 10, and the DC-DC module 10 enters the sleep state. After the DC-DC module 10 enters the sleep state, the sleep control module 30 is powered by the DC bus of the frequency converter. When the sleep control module 30 monitors that the DC-DC module needs to be woken up, it issues a command through the control signal d to make the auxiliary unit 11 of the DC-DC module 10 enter the normal working state, and the DC-DC module is in the wake-up state.

[0024] By adding a sleep architecture to the energy-saving system, the loss of the system is 0.01W, and it can support standby for 50,000 - 100,000 hours. If the sleep function is not added, the loss of the DC-DC module during idle time is about 30W. The battery capacity of the energy-saving system is generally 0.5KWH - 1KWH, and the battery power will be exhausted in 13 to 30 hours.

[0025] As an improved solution, the DC-DC module 10 is provided with an auxiliary power supply. The auxiliary power supply is a passive drive type conversion circuit, which draws power from the energy storage module 20 via an electric control switch and converts it to supply the weak power part of the DC-DC module 10 as a power supply. The controller 31 is electrically connected to the controlled end of the electric control switch to form an auxiliary power supply multiplexing as the auxiliary unit 11. The DC-DC module 10 is powered by the auxiliary power supply on its board. When the auxiliary power supply is working, the DC-DC module 10 is in the wake-up state. When the auxiliary power supply is not working, the DC-DC module 10 is in the sleep state. The energy of the auxiliary power supply comes from the energy storage module and is controlled by the electric control switch. Through the above structural design, the auxiliary power supply of the active DC is multiplexed as the auxiliary power supply 11 to control the DC-DC module 10 to enter the sleep state, realizing simplified structure, reliable control and instant shutdown.

[0026] Furthermore, the auxiliary power supply is provided with a second power supply line. The power supply of the sleep control module comes from the auxiliary power supply a of the DC-DC module and the DC bus b of the frequency converter. When the auxiliary power supply of the DC-DC module is working or the DC bus of the frequency converter is powered, the sleep control module is in the working state. At this time, the MCU of the sleep control module will continuously monitor the voltage of the DC bus of the frequency converter. After the sleep control module 30 is woken up by the DC bus voltage, the power supply of the auxiliary power supply takes over and supplements to ensure the stable operating environment of the controller 31 and the sensing unit 32.

[0027] Furthermore, the electric control switch is a relay K. The normally open contact of the relay K is connected in series to the line between the input end of the auxiliary power supply and the energy storage module 20. The coil of the relay K is controlled by the controller 31. By controlling the opening and closing of the relay K, the working state of the auxiliary power supply of the DC-DC module is controlled. When the relay K is turned on, the auxiliary power supply of the DC-DC module is in the working state, and the DC-DC module is in the wake-up state, and the energy of the elevator can be absorbed normally. At this time, the auxiliary power supply will consume the energy on the battery pack; when the relay K is turned off, the auxiliary power supply of the DC-DC module is in the non-working state, and the DC-DC module enters the sleep state. At this time, the auxiliary power supply does not consume the energy of the battery pack. Through the anti-interference and electrical isolation of the relay, voltage intrusion is avoided from damaging the control components. At the same time, the sleep control module 30 automatically opens the circuit when powered off to ensure the reliability of sleep control.

[0028] In this embodiment, the energy storage module 20 preferably uses a battery pack to expand the selection space of the auxiliary power supply and facilitate the formation of the power supply output to the sleep control module 30.

[0029] Based on the above sleep control architecture, the sleep control module 30 can execute the following preferred special control methods, including: monitoring the power data of the DC bus of the frequency converter, and judging the usage status of the elevator according to the power data; when it is monitored that the elevator has not been used for longer than the set duration, outputting a control signal to the auxiliary unit 11 to control the DC-DC module 10 to enter the sleep state, and when it is monitored that the elevator is in the usage state, controlling the auxiliary unit 11 to wake up the DC-DC module 10. Among them, to simplify the circuit and control logic and save resources, the presence or absence of power supply to the DC-DC module 10 based on the auxiliary unit 11 is configured as the operation mode for controlling whether the DC-DC module 10 works or not.

[0030] For the operation of the sleep control module to put the DC-DC module into sleep, as an example, it can be judged whether there is someone using the elevator by monitoring the state of the bus voltage of the frequency converter: 1) Based on the rising rate and / or falling rate of the DC bus voltage of the frequency converter, when the DC bus voltage of the frequency converter has been in a stable state, such as always being at a voltage of 570V, it is considered that there is no one using the elevator at this time; 2) When the DC bus voltage of the frequency converter is 0 (at this time, the power supply of the sleep control module comes from the auxiliary power supply of the DC-DC module), it is considered that there is no one using the elevator at this time. Among them, the judgment logic preferably adopts the AND method to avoid misjudgment and ensure accuracy.

[0031] When the MCU monitors that the elevator has not been used for more than 20 minutes, the sleep control module makes a decision to let the DC-DC module enter the sleep state, turns off the relay K. At this time, the auxiliary power supply of the DC-DC module does not work, and the DC-DC module enters the sleep state. When the DC bus voltage of the frequency converter has no power and the DC-DC module enters the sleep state, neither of the two power supply lines supplies power to the sleep control module, and the sleep control module itself enters the sleep state and does not consume energy.

[0032] For the operation of the sleep control module to wake up the DC-DC module, as an example, the sleep control module uses the voltage on the DC bus of the frequency converter as the wake-up signal. When someone uses the elevator, there is voltage on the DC bus of the frequency converter. At this time, the sleep control module is woken up and in the working state. The MUC continuously monitors the state of the bus voltage. When it is found that the voltage fluctuation of the bus voltage is greater than ΔV, usually ΔV = 6V / 300ms, it is considered that someone is using the elevator, controls K to turn on, the auxiliary power supply supplies power stably, and the DC-DC module is woken up.

[0033] The above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent replacements or changes, and should be covered by the protection scope of the present invention.

Claims

1. A dormant control architecture of an energy storage energy-saving system, used for energy control in an elevator room, comprising a DC-DC module and an energy storage module, wherein the DC-DC module is an actively driven type, and the strong current part of the DC-DC module absorbs the electric energy of the DC bus of the elevator inverter and stores it in the energy storage module, characterized in that: The weak current part of the DC-DC module draws power from the energy storage module, and the DC-DC module has at least an auxiliary unit for controlling it to enter a dormant state; It also includes a sleep control module, which has at least a first power supply line whose energy comes from the DC bus. The sleep control module includes a controller and a sensor unit. The sensor unit is used to monitor the power state of the DC bus. The controller is respectively coupled to the sensor unit and the auxiliary unit, and is used to output a control signal for controlling the sleep state of the DC-DC module according to the power state of the DC bus.

2. The sleep control architecture according to claim 1, wherein: The DC-DC module is provided with an auxiliary power supply, which takes power from the energy storage module via an electrically controlled switch and converts it to supply the weak current part of the DC-DC module as a power supply. The controller is electrically connected to the controlled end of the electrically controlled switch to form an auxiliary power supply multiplexing as the auxiliary unit.

3. The sleep control architecture according to claim 2, wherein: The auxiliary power supply is provided with a second power supply circuit output to supply power to the sleep control module.

4. The sleep control architecture according to claim 2, wherein: The electric control switch is a relay, the normally open contact of the relay is connected in series to the line between the auxiliary power input terminal and the energy storage module, and the coil of the relay is controlled by the controller.

5. The sleep control architecture according to claim 2, wherein: The auxiliary power supply is a passive drive type conversion circuit.

6. The sleep control architecture according to claim 5, characterized in that: The energy storage module is a battery pack.

7. A sleep control method for an energy storage energy-saving system, applied to the sleep control architecture according to any one of claims 1 to 6, characterized in that: The sleep control module at least performs the following steps: Monitor the power data of the inverter DC bus and determine the elevator usage status based on the power data; When it is monitored that the elevator has not been used for more than a set time, a control signal is output to the auxiliary unit to control the DC-DC module to enter sleep mode; and when it is monitored that the elevator is in use, the auxiliary unit is controlled to wake up the DC-DC module.

8. The sleep control method according to claim 7, characterized in that: Based on whether the auxiliary unit supplies power to the DC-DC module, it is used as a control method to control whether the DC-DC module works or not.

9. The sleep control method according to claim 7, characterized in that: The method of judging the use status of the elevator according to the power data further includes: Based on the climbing rate and / or falling rate of the inverter DC bus voltage, it is determined that the elevator is not in use when the DC bus voltage maintains a stable state; and / or When the inverter DC bus voltage is zero, it is determined that the elevator is not in use.

10. The sleep control method according to claim 7, characterized in that: When the power supply line supplies power to the sleep control module, the sleep control module is controlled to be in a working state, otherwise the sleep control module itself is controlled to enter sleep mode, and the sleep control module is configured to use the voltage on the DC bus of the inverter as a wake-up signal.

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