Energy-saving control devices, systems and methods

Abstract

This application relates to an energy-saving control device, system, and method. The energy-saving control device includes: a battery module; a magnetic latching switch module connected to the DC bus of a frequency converter module and the battery module, and used to connect or disconnect the path between the battery module and the frequency converter module; a drive control module connected to both the battery module and the magnetic latching switch module, connected to the DC bus, and used to acquire a first voltage signal from the battery module, a second voltage signal from the DC bus, and a target voltage difference range, and generate a first pulse drive current based on the first voltage signal, the second voltage signal, and the target voltage difference range; the first pulse drive current is used to control the on / off state of the magnetic latching switch module. This energy-saving control device can reduce energy waste.

Description

Technical Field

[0001] This application relates to the field of elevator technology, and in particular to an energy-saving control device, system and method. Background Technology

[0002] In related technologies, elevators are powered by mains electricity. When the mains power fails, the elevator cannot operate stably for an extended period, affecting daily work and life. At the same time, regenerative energy is generated when the elevator drives the main circuit.

[0003] The regenerative energy generated by elevators is currently processed by consuming resistors, resulting in significant energy waste. Summary of the Invention

[0004] Therefore, it is necessary to provide an energy-saving control device, system, and method that can reduce energy waste in response to the above-mentioned technical problems.

[0005] In a first aspect, this application provides an energy-saving control device, comprising:

[0006] Battery module;

[0007] A magnetic latching switch module is connected to the DC bus of the frequency converter module and the battery module, and is used to connect or disconnect the path between the battery module and the frequency converter module.

[0008] The drive control module is connected to the battery module and the magnetic latching switch module respectively. It is used to connect to the DC bus and to acquire the first voltage signal of the battery module, the second voltage signal of the DC bus and the target voltage difference range. Based on the first voltage signal, the second voltage signal and the target voltage difference range, it generates a first pulse drive current. The first pulse drive current is used to control the on / off state of the magnetic latching switch module.

[0009] In one embodiment, the drive control module includes:

[0010] A battery monitoring submodule, connected to the battery module, is used to monitor the first voltage signal of the battery module;

[0011] An energy management submodule, connected to the DC bus and the battery, is used to determine whether the voltage difference between the first voltage signal and the second voltage signal is within the target voltage difference range, and outputs a pulse control signal when the voltage difference between the first voltage signal and the second voltage signal is within the target voltage difference range;

[0012] The drive submodule, connected to the energy management submodule and the magnetic latching switch module, is used to isolate and filter the pulse control signal to generate a first pulse drive current.

[0013] In one embodiment, the drive control module further includes:

[0014] The power supply submodule is connected to the energy management submodule and the drive submodule respectively, and is used to provide power signals to the energy management submodule and the drive submodule respectively;

[0015] The reset submodule is connected to the power supply submodule and the magnetic latching switch module, respectively. It is used to store electrical energy when the power supply signal is received, and to release the stored electrical energy to output a second pulse drive current when the power supply signal is in an abnormal state. The second pulse drive current is used to control the magnetic latching switch module to be in the open state.

[0016] In one embodiment, the reset submodule includes:

[0017] An energy storage unit, wherein a first end of the energy storage unit is connected to the power submodule, and a second end of the energy storage unit is grounded;

[0018] An operational amplifier unit is provided, wherein a first input terminal of the operational amplifier unit is connected to the power supply submodule, and a second input terminal of the operational amplifier unit is connected to a third terminal of the energy storage unit; the operational amplifier unit is used to output a first control signal based on the power supply signal when the power supply signal is in an abnormal state; the operational amplifier unit is also used to output a second control signal based on the electrical energy stored in the energy storage unit when the power supply signal is in an abnormal state.

[0019] A reset unit is provided, wherein the first input terminal of the reset unit is connected to the output terminal of the operational amplifier unit, the second input terminal of the reset unit is connected to the power supply submodule, the third input terminal of the reset unit is grounded, and the output terminal of the reset unit is connected to the magnetic latching switch module; the reset unit is used to output a second pulse drive current when the second control signal is received.

[0020] In one embodiment, the frequency conversion module includes at least one frequency converter; the magnetic latching switch module includes:

[0021] At least one first magnetic latching relay, the first terminal of the first magnetic latching relay is connected to the first DC bus of the frequency converter module, the second terminal of the first magnetic latching relay is connected to the positive terminal of the battery, and the control terminal of the first magnetic latching relay is connected to the drive control module;

[0022] The second DC bus of the frequency converter module is connected to the negative terminal of the battery;

[0023] The drive control module is further configured to output a first A-pulse drive current when the voltage difference between the first voltage signal and the second voltage signal is within the target voltage difference range; the first A-pulse drive current is used to control the first magnetic latching relay to turn on.

[0024] In one embodiment, the magnetic latching switch module further includes at least one second magnetic latching relay, the first terminal of the second magnetic latching relay is connected to the second DC bus of the frequency converter module, the second terminal of the second magnetic latching relay is connected to the negative terminal of the battery, and the control terminal of the second magnetic latching relay is connected to the drive control module.

[0025] The energy-saving control device also includes a unidirectional conduction module, the current input terminal of which is connected to the first DC bus, and the current output terminal of which is connected to the positive terminal of the battery.

[0026] The drive control module is further configured to output a first B-pulse drive current to the first magnetic latching relay and a first A-pulse drive current to the second magnetic latching relay when the second voltage signal at the positive terminal of the battery is less than a preset voltage threshold; the first B-pulse drive current is used to control the first magnetic latching relay to disconnect.

[0027] In one embodiment, the driver submodule includes:

[0028] A signal isolation unit is connected to the energy management submodule and the power supply submodule respectively, and is used to isolate the pulse control signal and the power supply signal, and output a pulse drive signal according to the pulse control signal and the power supply signal;

[0029] A filtering unit, connected to the signal isolation unit, is used to filter the pulse drive signal after amplification and transformation.

[0030] The driving unit is connected to the filtering unit and the magnetic latching switch module respectively, and is used to generate a first pulse driving current according to the filtered pulse driving signal.

[0031] Secondly, this application provides an energy-saving control system, including a load, a frequency converter connected to the load, and the energy-saving control device described in any of the above embodiments.

[0032] Thirdly, this application provides an energy-saving control method, applied to the energy-saving control device described in any of the above embodiments; comprising:

[0033] Acquire the first voltage signal of the battery module, the second voltage signal of the DC bus, and the target differential voltage range;

[0034] A first pulse drive current is generated based on the first voltage signal, the second voltage signal, and the target differential pressure range; the first pulse drive current is used to control the on / off state of the magnetic latching switch module.

[0035] In one embodiment, the method for determining the target pressure differential range includes:

[0036] The maximum differential voltage threshold is determined based on the rated contact resistance and maximum power handling capacity of the magnetic latching switch module.

[0037] Determine N levels of candidate differential pressure intervals; wherein, the candidate differential pressure intervals include a first differential pressure threshold and a second differential pressure threshold, the first differential pressure threshold being less than the second differential pressure threshold; the second differential pressure threshold of the (i+1)th level candidate differential pressure interval is greater than the second differential pressure threshold of the ith level candidate differential pressure interval; the second differential pressure threshold of the Nth level candidate differential pressure interval is the maximum differential pressure threshold; 1≤i<N;

[0038] For a candidate differential pressure range, the on / off state of the magnetic latching switch module is controlled according to the candidate differential pressure range, the first voltage signal, and the second voltage signal to obtain the on / off ratio of the magnetic latching switch module;

[0039] When the on / off ratio is greater than or equal to a preset ratio threshold, the candidate differential pressure range is determined as the target differential pressure range;

[0040] If the on / off ratio is less than the preset ratio threshold, for the next level candidate differential pressure range, return to the step of controlling the on / off state of the magnetic latching switch module based on the candidate differential pressure range, the first voltage signal, and the second voltage signal, and obtaining the on / off ratio of the magnetic latching switch module, and continue execution until the target differential pressure range is determined; or, until the next level candidate differential pressure range is the Nth level candidate differential pressure range, and determine the Nth level candidate differential pressure range as the target differential pressure range;

[0041] The on / off ratio is used to indicate the ratio of a preset number of elevator runs to the number of times the magnetic latching switch module is turned on within the preset number of elevator runs.

[0042] The aforementioned energy-saving control device, system, and method include a battery module, a magnetic latching switch module, and a drive control module. The magnetic latching switch module connects the battery module and the frequency converter module, enabling mutual charging and discharging between the battery module and the frequency converter module. Simultaneously, by setting up the drive control module, a first pulse drive current can be output based on a first voltage signal, a second voltage signal of the DC bus of the frequency converter module, and a target voltage difference range, safely controlling the on / off state of the magnetic latching switch module. This helps to extend the service life of the magnetic latching switch module. Furthermore, since the magnetic latching switch module only needs to provide current at the moment of switching and does not need to be continuously powered, the energy consumption of the magnetic latching switch module is reduced, and energy waste is further avoided. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 This is a structural block diagram of the energy-saving control device and the frequency converter module in one embodiment;

[0045] Figure 2 This is a structural block diagram of the energy-saving control device and the frequency converter module in another embodiment;

[0046] Figure 3 The circuit structure diagram of the driver submodule is shown in one embodiment.

[0047] Figure 4 This is a structural block diagram of the energy-saving control device and the frequency converter module in another embodiment;

[0048] Figure 5 The circuit structure diagram of the driver submodule and reset submodule is shown in one embodiment.

[0049] Figure 6 This is a structural block diagram of the energy-saving control device and the frequency converter module in another embodiment;

[0050] Figure 7 This is a structural block diagram of the energy-saving control device and the frequency converter module in another embodiment;

[0051] Figure 8 The circuit structure diagram of the driver submodule and reset submodule is shown in one embodiment.

[0052] Figure 9 This is a flowchart illustrating an energy-saving control method in one embodiment;

[0053] Figure 10This is a flowchart illustrating a method for determining the target differential pressure range in one embodiment;

[0054] Figure 11 This is a flowchart illustrating an energy-saving control method in another embodiment.

[0055] Explanation of reference numerals in the attached drawings: 100-Energy-saving control device, 200-Variable frequency module, 10-Battery module, 20-Magnetic latching switch module, 21-Magnetic latching switch unit, 30-Drive control module, 41-Energy management sub-module, 42-Drive sub-module, 421-Signal isolation unit, 4211-First isolation sub-unit, 4212-Second isolation sub-unit, 422-Filtering unit, 4221-First filtering sub-unit, 4222-Second filtering sub-unit, 423-Drive unit, 43-Battery monitoring sub-module, 44-Reset sub-module, 441-Energy storage unit, 442-Operating amplifier unit, 443-Reset unit, 4431-First reset sub-unit, 4432-Second reset sub-unit. Detailed Implementation

[0056] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0057] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0058] It is understood that the terms “first,” “second,” etc., used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.

[0059] Spatial relation terms such as “below,” “under,” “below,” “below,” “above,” “above,” etc., are used herein to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, an element or feature described as “below,” “below,” or “below” will be oriented “above” the other element or feature. Therefore, the exemplary terms “below” and “under” can include both above and below orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein will be interpreted accordingly.

[0060] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediary element. Furthermore, in the following embodiments, "connection" should be understood as "electrical connection," "communication connection," etc., if there is transmission of electrical signals or data between the connected objects.

[0061] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates 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 possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Meanwhile, the term “and / or” as used in this specification includes any and all combinations of the associated listed items.

[0062] As described in the background section, this solution mainly concerns everyday elevators. Currently, the energy source for elevators is mainly mains electricity. At the same time, elevators regenerate energy during unloaded operation, but the current common method of handling this is through resistor consumption, which results in a large amount of energy waste.

[0063] Currently, there are various energy-saving systems related to elevators, but most of them rely on contactors for high-voltage circuit control. Ordinary contactors have limited mechanical lifespan, and the inrush current generated when they are connected to the DC bus further reduces their lifespan. Furthermore, when maintaining a closed circuit, the coil of an ordinary contactor needs to be continuously energized, which not only increases power consumption but also generates significant heat.

[0064] In some exemplary embodiments, please refer to Figure 1 This application provides an energy-saving control device 100, comprising:

[0065] Battery module 10;

[0066] The magnetic latching switch module 20 is connected to the DC bus of the frequency converter module 200 and the battery module 10, and is used to connect or disconnect the path between the battery module 10 and the frequency converter module 200.

[0067] The drive control module 30 is connected to the battery module 10 and the magnetic latching switch module 20 respectively. It is used to connect to the DC bus and to acquire the first voltage signal of the battery module, the second voltage signal of the DC bus and the target voltage difference range. Based on the first voltage signal, the second voltage signal and the target voltage difference range, it generates a first pulse drive current. The first pulse drive current is used to control the on / off state of the magnetic latching switch module 20.

[0068] In this embodiment, the frequency converter module 200 is connected to the elevator and used to control the elevator's operation. The frequency converter module 200 has two power supply methods: the first is to draw power from the mains power, and the second is to draw power from the battery module 10 by controlling the path between the magnetic latching switch module 20, the battery module 10, and the frequency converter module 200 through the drive control module 30. At the same time, the frequency converter module 200 can also charge the battery module 10 in reverse.

[0069] The drive control module 30 is used to detect the voltage and current status of the battery module 10. Based on the first voltage signal of the battery module 10, the second voltage signal of the frequency converter module 200, and the target voltage difference range, it determines whether the conditions for controlling the magnetic latching switch module 20 to switch on or off are met, and controls the on / off state of the magnetic latching switch module 20.

[0070] The magnetic latching switch module 20 may include a magnetic latching relay, a novel type of relay that uses permanent magnets to maintain the contact state, belonging to automatic switching devices. Its structure includes a base, a magnetic circuit section, a push block, and a contact section. The base is divided into upper and lower cavities by a first baffle, with the magnetic circuit section and contact section respectively installed within them. The magnetic circuit section consists of an iron core, a yoke, and magnets forming an E-shaped magnetic conductive structure with a 90-degree side rotation. The armature is rotatably supported in the middle, with both ends corresponding to the top of the yoke, achieving a seesaw-like action. The push block connects the armature to the moving spring, completing the contact switching. Compared to ordinary relays, the magnetic latching relay has superior characteristics such as power saving, fast action, long life, small size, stable performance, and strong load-bearing capacity. In this application, by selecting a magnetic latching relay to control the on / off state of the current loop between the battery module 10 and the frequency converter module 200, it is not necessary for the drive control module 30 to continuously output control signals to the magnetic latching switch module 20. Instead, only a pulse drive current is needed when it is necessary to control the on / off state of the magnetic latching switch module 20 to achieve control of its on / off state.

[0071] This application avoids the problems of increased overall energy consumption and coil overheating caused by the continuous power supply required for traditional relay coils, which reduces the relay's lifespan due to the continuous current and the resulting heat. This application only needs to provide current during the on / off state switching of the magnetically latching relay, reducing the relay's energy consumption. Furthermore, since a continuous current supply is not required, the overheating problem of the relay coil is effectively solved, thus improving the relay's lifespan.

[0072] The aforementioned energy-saving control device 100 includes a battery module 10, a magnetic latching switch module 20, and a drive control module 30. The magnetic latching switch module 20 connects the battery module 10 and the frequency converter module 200, enabling mutual charging and discharging between the battery module 10 and the frequency converter module 200. Simultaneously, by setting the drive control module 30, it can output a first pulse drive current based on a first voltage signal, a second voltage signal of the DC bus of the frequency converter module 200, and a target voltage difference range, safely controlling the on / off state of the magnetic latching switch module 20. This helps to extend the service life of the magnetic latching switch module 20. Furthermore, since the magnetic latching switch module 20 only needs to provide current at the moment of switching and does not need to be continuously powered, the energy consumption of the magnetic latching switch module 20 is reduced, and energy waste is further avoided.

[0073] In some exemplary embodiments, please refer to Figure 2 The drive control module 30 includes:

[0074] The energy management submodule 41 is connected to the DC bus and the battery. It is used to determine whether the voltage difference between the first voltage signal and the second voltage signal is within the target voltage difference range, and outputs a pulse control signal when the voltage difference between the first voltage signal and the second voltage signal is within the target voltage difference range.

[0075] The drive submodule 42 is connected to the energy management submodule 41 and the magnetic latching switch module 20. It is used to amplify and filter the pulse control signal to generate the first pulse drive current.

[0076] The battery monitoring submodule 43 is connected to the battery module 10 and is used to monitor the first voltage signal of the battery module 10.

[0077] The battery monitoring submodule 43 is mainly responsible for monitoring and collecting information such as voltage, temperature, and current of each cell in the battery module 10. The battery monitoring submodule 43 can establish a connection with the energy management submodule 41 using communication methods such as CAN, RS485, daisy chain, wired network, or PLC.

[0078] It is understood that the magnetic latching switch module 20 includes a magnetic latching relay, which includes an induction coil. The direction of current flow on the induction coil can control the on / off state of the magnetic latching relay.

[0079] In this embodiment, when the energy management submodule 41 does not experience overcurrent, overtemperature, or overvoltage faults, and the elevator is not under maintenance, the energy management submodule 41 can monitor in real time whether the voltage difference between the first and second voltage signals is within the target voltage difference range. When it determines that the voltage difference between the first and second voltage signals is within the target voltage difference range, it outputs a pulse control signal to control the drive submodule 42 to output a first pulse drive current. When the drive submodule 42 receives the pulse control signal, it amplifies and filters the pulse control signal to ensure that the pulse has sufficient voltage / current amplitude to reliably drive the switch and to avoid short-time pulses and spike interference, thus ensuring the accuracy of the on / off state of the magnetic latching switch module 20.

[0080] Specifically, the pulse control signal may include a first pulse signal and a second pulse signal, and the first pulse drive current may include a first A pulse drive current and a first B pulse drive current. When the energy management submodule 41 outputs the first pulse signal to the drive submodule 42, the drive submodule 42 outputs the first A pulse drive current to the induction coil to control the magnetic latching relay to turn on; when the energy management submodule 41 outputs the second pulse signal to the drive submodule 42, the drive submodule 42 outputs the first B pulse drive current to the induction coil to control the magnetic latching relay to turn off.

[0081] In one example, the energy management submodule 41, the drive submodule 42, and the battery monitoring submodule 43 may be an integrated circuit module; or, the energy management submodule 41, the drive submodule 42, and the battery monitoring submodule 43 may be independent circuit modules; or, some submodules of the energy management submodule 41, the drive submodule 42, and the battery monitoring submodule 43 may be integrated together, for example, the energy management submodule 41 and the drive submodule 42 may be an integrated circuit module, while the battery monitoring submodule 43 may be a circuit module independent of the energy management submodule 41 and the drive submodule 42.

[0082] In this embodiment, the drive control module 30 is divided into a battery monitoring submodule 43 for monitoring the battery module status, an energy management submodule 41 for deciding whether to control the magnetic latching switch module 20, and a drive submodule 42 for controlling the magnetic latching switch module 20, thus separating the "control logic" from the "power drive". The energy management submodule 41 can implement complex algorithms using a low-power MCU or a dedicated chip, while the drive submodule 42 provides sufficient current to drive the magnetic latching switch. The drive control module 30 of this application has good maintainability and replaceability.

[0083] In some exemplary embodiments, please refer to Figure 3 The driver submodule 42 includes:

[0084] The signal isolation unit 421 is connected to the energy management submodule 41 and the power supply submodule respectively, and is used to output a pulse drive signal according to the isolation pulse control signal and the power supply signal.

[0085] The filtering unit 422 is connected to the signal isolation unit 421 and is used to filter the pulse drive signal after amplification and transformation.

[0086] The drive unit 423 is connected to the filter unit 422 and the magnetic latching switch module 20 respectively, and is used to generate a first pulse drive current according to the filtered pulse drive signal.

[0087] The pulse control signal can include control signal IN1 and control signal IN2. In one example, when control signal IN1 is high and control signal IN2 is low, the pulse control signal is a first pulse signal, the drive unit 423 outputs a first pulse A drive current, and the magnetic latching switch module 20 is turned on; when control signal IN2 is high and control signal IN1 is low, the pulse control signal is a second pulse signal, the drive unit 423 outputs a first pulse B drive current, and the magnetic latching switch module 20 is turned off. In another example, when control signal IN2 is high and control signal IN1 is low, the pulse control signal is a first pulse signal, the drive unit 423 outputs a first pulse A drive current, and the magnetic latching switch module 20 is turned on; when control signal IN1 is high and control signal IN2 is low, the pulse control signal is a second pulse signal, the drive unit 423 outputs a first pulse B drive current, and the magnetic latching switch module 20 is turned off.

[0088] In this embodiment, the signal isolation unit 421 may include a first isolation subunit 4211 and a second isolation subunit 4212, and the filtering unit 422 may include a first filtering subunit 4221 and a second filtering subunit 4222. The pulse drive signal includes a drive signal S1 and a drive signal S2. Specifically, the first isolation subunit 4211 isolates the control signal IN1 and outputs the drive signal S1, while the first filtering subunit 4221 filters the drive signal S1. The second isolation subunit 4212 isolates the control signal IN2 and outputs the drive signal S2, while the second filtering subunit 4222 filters the drive signal S2. The first output terminal OUT1 of the drive unit 423 is connected to the first end of the induction coil of the magnetic latching relay, and the second output terminal OUT2 of the drive unit 423 is connected to the second end of the induction coil of the magnetic latching relay.

[0089] In one example, see Figure 3The first isolation subunit 4211 includes a first switch Q1, and the second isolation subunit 4212 includes a second switch Q2. Both the first switch Q1 and the second switch Q2 can be either high-level or low-level. The control terminal of the first switch Q1 receives the control signal IN1, its first terminal receives the power signal VIN+, and its second terminal outputs the drive signal S1. The second terminal of the first switch Q1 is connected to the first input terminal of the drive unit 423. Similarly, the control terminal of the second switch Q2 receives the control signal IN2, its first terminal receives the power signal VIN+, and its second terminal outputs the drive signal S2. The second terminal of the second switch Q2 is connected to the second input terminal of the drive unit 423.

[0090] Taking the example where both the first switch Q1 and the second switch Q2 are low-level and conducting, when the energy management submodule 41 outputs the first pulse signal, i.e., when the control signal IN1 is low-level and the control signal IN2 is high-level, the first switch Q1 turns on in response to the control signal IN1, the first isolation subunit 4211 outputs a high-level drive signal S1, the second switch Q2 is cut off in response to the control signal IN2, the second isolation subunit 4212 outputs a low-level drive signal S2, and then the drive unit 423 outputs a first pulse drive current with the current flow direction from OUT2 to OUT1. When the magnetic latching switch module 20 is turned on, and the energy management submodule 41 outputs the second pulse signal (i.e., when the control signal IN2 is low and the control signal IN1 is high), the second switch Q2 turns on in response to the control signal IN2, the second isolation subunit 4212 outputs a high-level drive signal S2, the first switch Q1 is cut off in response to the control signal IN1, the first isolation subunit 4211 outputs a low-level drive signal S1, and then the drive unit 423 outputs a first pulse drive current with the current flow direction from OUT1 to OUT2, and the magnetic latching switch module 20 is turned off.

[0091] In this embodiment, the signal isolation unit 421 can prevent the spikes at both ends of the switching transistor from affecting each other, and can also prevent large currents from being injected into the energy management submodule in the reverse direction.

[0092] In the above examples, when drive signal S1 is high and drive signal S2 is low, drive unit 423 outputs a first pulse A drive current; when drive signal S1 is low and drive signal S2 is high, drive unit 423 outputs a first pulse B drive current; when drive signals S1 and S2 are both high or both low, drive unit 423 does not output drive current. In other examples, drive unit 423 can also be set to output a first pulse A drive current when drive signal S1 is low and drive signal S2 is high; and output a first pulse B drive current when drive signal S1 is high and drive signal S2 is low. This application does not limit this.

[0093] The first isolation subunit 4211 may further include protection resistors R1, R2 and R3, and the second isolation subunit 4212 may further include protection resistors R4, R5 and R6.

[0094] The first filtering subunit 4221 may include a current-limiting resistor R7 and a first filtering capacitor C1. The first terminals of both the current-limiting resistor R7 and the first filtering capacitor C1 are connected to the first input terminal of the driving unit 423, and the second terminals of both the current-limiting resistor R7 and the first filtering capacitor C1 are grounded. The second filtering subunit 4222 may include a current-limiting resistor R8 and a second filtering capacitor C2. The first terminals of both the current-limiting resistor R8 and the second filtering capacitor C2 are connected to the second input terminal of the driving unit 423, and the second terminals of both the current-limiting resistor R8 and the second filtering capacitor C2 are grounded.

[0095] The first filter capacitor C1 and the second filter capacitor C2 achieve the filtering effect of pulse signals. Utilizing the charging and discharging characteristics of the capacitors, a time constant is established. Only pulse signals with a certain time width can control the magnetic latching relay. This effectively protects against short-duration interference signals such as pulse spikes. Taking the filtering of the drive signal S1 as an example, the specific implementation and time constant calculation method are as follows: Assume the on-resistance of the first switching transistor Q1 is R. DS Then the charging time constant τ of the first filter capacitor C1 is τ = [R7 / / (R3+R DS )]*C1, R48 / / (R51+R DS Let R be the voltage across the capacitor. The voltage V at which the capacitor is fully charged can be calculated using the voltage divider effect of the resistors. C At this point, according to the capacitor charging formula VC(t)=V C *(1-e -t / τ According to the formula, the parameter values ​​of R and C1 can be selected to achieve the time length corresponding to the specific voltage of the input IN1 of the drive unit 423, so as to meet the requirements of the pulse signal length and prevent short-time pulse interference from causing false triggering. At the same time, due to the existence of the pull-up resistor, the pulse spike interference will not change the conduction state of the switch, and the operation of the subsequent circuit will not be affected.

[0096] In this embodiment, a stable and reliable drive circuit is provided, which can receive control signals IN1 and IN2 to control the opening and closing of the magnetic latching relay, thereby improving the flexibility of the magnetic latching relay control and enabling real-time switching of the magnetic latching relay's state. At the same time, a pulse filter circuit is added to avoid the impact of short-time pulses and spikes on the circuit operation, thereby improving the stability of the control circuit and enabling accurate application of control signals to the magnetic latching relay.

[0097] In some exemplary embodiments, please refer to Figure 4 The drive control module 30 also includes:

[0098] Power submodule ( Figure 4 (not shown in the diagram) is connected to the energy management submodule 41 and the drive submodule 42 respectively, and is used to provide power signals to the energy management submodule 41 and the drive submodule 42 respectively;

[0099] The reset submodule 44 is connected to the power supply submodule and the magnetic latching switch module 20 respectively. It is used to store electrical energy when a power signal is received, and to release the stored electrical energy when the power signal is in an abnormal state, so as to output a second pulse drive current. The second pulse drive current is used to control the magnetic latching switch module 20 to be in the open state.

[0100] It is understood that in the energy-saving control device 100 of this application, a power supply submodule is required to provide a power signal VIN+ to the energy management submodule 41, drive submodule 42, battery monitoring submodule 43, etc., to ensure the normal operation of the energy-saving control device 100. The power supply submodule can be an independent low-voltage power supply, or it can be connected to the battery module 10 to convert the high-voltage electrical energy of the battery module 10 into low-voltage electrical energy and output the power signal VIN+.

[0101] In applications, an abnormal power signal refers to situations such as the power supply submodule losing power or the power signal output by the power supply submodule being attenuated. When the power supply submodule loses power or the power signal is attenuated, the energy-saving control device 100 will not function properly. That is, the energy management submodule 41 cannot determine whether the magnetic latching switch module 20 should be turned on or off, and cannot control the drive submodule 42 to drive the magnetic latching switch module 20 to be turned on or off. In this case, if the magnetic latching switch module 20 is in the on state, the battery module 10 will remain in an uncontrolled connection state with the frequency converter module 200, which may cause safety hazards, such as battery over-discharge, inability to isolate faults, etc., thereby endangering the safety of the battery module 10 and / or the magnetic latching switch module 20.

[0102] To address the above issues and improve the safety of the energy-saving control device 100, this application includes a reset submodule 44. When the power supply submodule is working normally, the reset submodule 44 can store electrical energy. When the power supply submodule loses power or the power signal weakens, the reset submodule 44 can output a pulse current to the magnetic latching switch module 20 based on the previously stored electrical energy. This pulse current is used to control the magnetic latching switch module 20 to turn off, ensuring that the magnetic latching switch module 20 can be safely turned off, isolating the frequency converter module 200 from the battery module 10, and ensuring the safety of the energy-saving control device 100.

[0103] In this embodiment, by setting the reset submodule 44 as a "watchdog" circuit, when the power signal is detected to be lost or attenuated, it actively and quickly issues a disconnect command using its stored electrical energy, thereby realizing the fault-safe mode of "automatic disconnection in case of abnormality" and ensuring that the system can return to a certain safe state in extreme cases.

[0104] In some exemplary embodiments, please refer to Figure 5 The reset submodule 44 includes:

[0105] Energy storage unit 441, the first end of energy storage unit 441 is connected to the power submodule, and the second end of energy storage unit 441 is grounded;

[0106] Operational amplifier unit 442 has its first input terminal connected to the power supply submodule and its second input terminal connected to the third terminal of energy storage unit 441. Operational amplifier unit 442 is used to output a first control signal based on the power supply signal when a power supply signal is received. Operational amplifier unit 442 is also used to output a second control signal based on the stored energy in energy storage unit 441 when the power supply signal is in an abnormal state.

[0107] The reset unit 443 has a first input terminal connected to the output terminal of the operational amplifier unit 442, a second input terminal connected to the power supply submodule, a third input terminal grounded, and an output terminal connected to the magnetic latching switch module 20. The reset unit 443 is used to output a second pulse drive current when a second control signal is received.

[0108] Specifically, the energy storage unit 441 includes an energy storage capacitor C3, a protection resistor C9, and a diode D1; the operational amplifier unit 442 includes an operational amplifier A1; the reset unit 443 includes a first reset subunit 4431 and a second reset subunit 4432, the first reset subunit 4431 includes a third switch Q3 and an inverter U1A, and the second reset subunit 4432 includes a fourth switch Q4. In this configuration, the negative input terminal of operational amplifier A1 is used to receive the power signal VIN+. The positive input terminal of operational amplifier A1 is connected to the first terminal of energy storage capacitor C3 and protection resistor C9, and the output terminal of diode D1. The input terminal of diode D1 is used to receive the power signal VIN+. The output terminal of operational amplifier A1 is connected to the input terminal of inverter U1A and the control terminal of fourth switch Q4. The output terminal of inverter U1A is connected to the control terminal of third switch Q3. The first terminal of third switch Q3 is used to receive the power signal VIN+. The second terminal of third switch Q3 is connected to the first output terminal of drive unit 423, that is, the second terminal of third switch Q3 is connected to the first terminal of induction coil. The first terminal of fourth switch Q4 is grounded. The second terminal of fourth switch Q4 is connected to the second output terminal of drive unit 423, that is, the second terminal of fourth switch Q4 is connected to the second terminal of induction coil.

[0109] In one example, we will use a switch where the third switch Q3 is turned on at a low level and the fourth switch Q4 is turned on at a high level.

[0110] When the power supply submodule normally outputs the power signal VIN+, the energy storage capacitor C3 stores the energy of the power signal VIN+. The potential at the negative input terminal of operational amplifier A1 is higher than the potential at the positive input terminal of operational amplifier A1, resulting in operational amplifier A1 outputting a low-level signal. The third switch Q3 and the fourth switch Q4 are turned off, and the reset unit 443 does not output current. When the power supply submodule loses power, the energy storage capacitor C3 releases the stored energy. The potential at the negative input terminal of operational amplifier A1 is lower than the potential at the positive input terminal of operational amplifier A1, resulting in operational amplifier A1 outputting a high-level signal. The third switch Q3 and the fourth switch Q4 are turned on, the reset unit 443 outputs a second pulse drive current, OUT1 becomes high, OUT2 becomes low, and the magnetic latching relay is turned off. During the power supply submodule power failure, diode D1 prevents the energy storage capacitor C3 from reversing its power supply to the power supply submodule, ensuring that the energy storage capacitor C3 only discharges to the positive input terminal of operational amplifier A1, thus guaranteeing operational amplifier output reversal during power failure.

[0111] It is understandable that when the power supply submodule loses power, the power supply submodule does not drop directly from VIN+ to 0, but rather it is a process. During this power-down process, the first terminal of the fourth switch Q4 remains at a high potential, and the operational amplifier A1 can continue to operate normally.

[0112] In another example, this application may also provide an energy storage unit for the first terminal of the fourth switch Q4 and the power supply terminal of the operational amplifier A1, respectively. The energy storage unit corresponding to the first terminal of the fourth switch Q4 and the energy storage unit corresponding to the power supply terminal of the operational amplifier A1 can store electrical energy when the power supply submodule is working normally, and supply power to the first terminal of the fourth switch Q4 and the operational amplifier A1 respectively when the power supply submodule is powered off or the power signal is attenuated, so as to further ensure the normal operation of the reset submodule 44.

[0113] In this embodiment, a circuit structure for a reset submodule 44 is designed that does not affect the output of the drive submodule 42 when the power submodule is normal, and controls the magnetic latching switch module 20 to disconnect when the power submodule is powered off. The reset submodule 44 based on analog circuit has a fast response speed, ensuring that the path between the battery module 10 and the frequency converter module 200 can be quickly cut off when the power submodule is powered off, thus ensuring the safe operation of the energy-saving control device.

[0114] In some exemplary embodiments, please refer to Figure 6 and Figure 7 The frequency converter module 200 includes at least one frequency converter; the magnetic latching switch module 20 includes:

[0115] At least one first magnetic latching relay K1, the first terminal of the first magnetic latching relay K1 is connected to the first DC bus of the frequency converter module 200, the second terminal of the first magnetic latching relay K1 is connected to the positive terminal of the battery, and the control terminal of the first magnetic latching relay K1 is connected to the drive control module 30.

[0116] At least one second magnetic latching relay K2, the first terminal of the second magnetic latching relay K2 is connected to the second DC bus of the frequency converter module 200, the second terminal of the second magnetic latching relay K2 is connected to the negative terminal of the battery, and the control terminal of the second magnetic latching relay K2 is connected to the drive control module 30.

[0117] The second DC bus of the inverter module 200 is connected to the negative terminal of the battery;

[0118] The drive control module 30 is further configured to output a first A-pulse drive current when the voltage difference between the first voltage signal and the second voltage signal is within the target voltage difference range; the first A-pulse drive current is used to control the first magnetic latching relay K1 to turn on.

[0119] In this embodiment, for each frequency converter, a first magnetic latching relay K1 and a second magnetic latching relay K2 can be provided. That is, each frequency converter is connected to a magnetic latching switch unit 21, and the magnetic latching switch unit 21 includes a first magnetic latching relay K1 and a second magnetic latching relay K2. The energy management submodule 41 can monitor the first voltage signal of the battery module 10 and the second voltage signal of the first DC bus of each frequency converter in real time. When it detects that the difference between the first voltage signal and the second voltage signal is within the target voltage difference range, it controls the corresponding first magnetic latching relay K1 and second magnetic latching relay K2 to close.

[0120] In one example, for inverter x, assuming that the first magnetic latching relay K1 and the second magnetic latching relay K2 corresponding to inverter x are in the open state, when the energy management submodule 41 detects that the difference between the first voltage signal of the battery module 10 and the second voltage signal of the first DC bus of inverter x is within the target differential voltage range, it can control the first magnetic latching relay K1 and the second magnetic latching relay K2 corresponding to inverter x to close.

[0121] In some exemplary embodiments, the magnetic latching switch module 20 further includes:

[0122] The energy-saving control device also includes a unidirectional conduction module, the current input terminal of which is connected to the first DC bus, and the current output terminal of which is connected to the positive terminal of the battery.

[0123] The drive control module 30 is also used to output a first B pulse drive current to the first magnetic latching relay K1 and a first A pulse drive current to the second magnetic latching relay K2 when the second voltage signal of the battery positive terminal is less than a preset voltage threshold; the first B pulse drive current is used to control the first magnetic latching relay K1 to disconnect.

[0124] In this embodiment, the unidirectional conduction module includes at least one unidirectional conduction unit, and the unidirectional conduction unit includes a diode D2. The number of unidirectional conduction units, the number of frequency converters, and the number of first magnetic latching relays K1 are the same. That is, a diode D2 is connected between the first DC bus of each frequency converter and the positive terminal of the battery module 10.

[0125] In one example, see Figure 7Taking inverter x as an example, when the battery monitoring submodule 43 detects that the battery module 10 is undervoltage, it can report the undervoltage information of the battery module 10 to the energy management submodule 41. Then, if the first magnetic latching relay K1 and the second magnetic latching relay K2 corresponding to inverter x are both in the closed state, the energy management submodule 41 controls the drive submodule 42 to output a first B pulse drive current to the first magnetic latching relay K1 corresponding to inverter x, so that the first magnetic latching relay K1 is opened. At the same time, it outputs a first A pulse drive current to the second magnetic latching relay K2 corresponding to inverter x, or does not output current to the second magnetic latching relay K2 corresponding to inverter x. Then, inverter x and battery module 10 can form a current loop through diode D2 and second magnetic latching relay K2. Due to the unidirectional conduction characteristic of diode D2, battery module 10 will not discharge to inverter x, but will only receive the electrical energy released by inverter x, thereby avoiding the deterioration of the undervoltage situation of battery module 10, while ensuring that inverter charges battery module 10.

[0126] Similarly, when the battery module 10 is undervoltage, if both the first magnetic latching relay K1 and the second magnetic latching relay K2 corresponding to the inverter x are in the open state, the energy management submodule 41 controls the drive submodule 42 to output the first pulse A drive current to the second magnetic latching relay K2 corresponding to the inverter x, while not outputting current to the first magnetic latching relay K1 corresponding to the inverter x, or outputting the first pulse B drive current to the first magnetic latching relay K1 corresponding to the inverter x, so that the inverter x and the battery module 10 can form a current loop through the diode D2 and the second magnetic latching relay K2.

[0127] In one embodiment, the drive submodule 42 and the reset submodule 44 can be integrated on the same circuit board. Furthermore, for each magnetic latching relay, a separate configuration can be provided. Figure 5 The control circuit shown; or, at least part of the control circuitry of the magnetic latching relay is integrated onto a circuit board, for example, as shown. Figure 8 As shown, the control circuits of the first magnetic latching relay K1 and the second magnetic latching relay K2 in a magnetic latching switch module 20 are integrated. OUT1 is connected to the first end of the induction coil of the first magnetic latching relay K1, OUT2 is connected to the second end of the induction coil of the first magnetic latching relay K1, OUT3 is connected to the first end of the induction coil of the second magnetic latching relay K2, and OUT4 is connected to the second end of the induction coil of the second magnetic latching relay K2.

[0128] In some exemplary embodiments, this application provides an energy-saving control system, including a load, a frequency converter 200 connected to the load, and an energy-saving control device 100 as described in any of the above embodiments.

[0129] The load may include elevators, or loads with similar operating characteristics to elevators, such as elevators, oil pumps, etc., which can generate regenerative energy and recycle it while consuming electricity.

[0130] In some exemplary embodiments, please refer to Figure 9 This application provides an energy-saving control method, applied to the energy-saving control device 100 in any of the above embodiments; including steps S901 and S902.

[0131] S901: Acquire the first voltage signal of the battery module, the second voltage signal of the DC bus, and the target differential voltage range.

[0132] S902: Generate a first pulse drive current based on the first voltage signal, the second voltage signal, and the target differential voltage range; the first pulse drive current is used to control the on / off state of the magnetic latching switch module.

[0133] The aforementioned energy-saving control method includes a battery module 10, a magnetic latching switch module 20, a battery monitoring submodule 43, and a drive control module 30. The magnetic latching switch module 20 connects the battery module 10 and the frequency converter module 200, enabling mutual charging and discharging between the battery module 10 and the frequency converter module 200. Simultaneously, by setting up the drive control module 30 and the battery detection module, a first pulse drive current can be output based on a first voltage signal, a second voltage signal of the DC bus of the frequency converter module 200, and a target voltage difference range, safely controlling the on / off state of the magnetic latching switch module 20. This helps to extend the service life of the magnetic latching switch module 20. Furthermore, since the magnetic latching switch module 20 only needs to provide current at the moment of switching and does not need to be continuously powered, the energy consumption of the magnetic latching switch module 20 is reduced, and energy waste is further avoided.

[0134] In some exemplary embodiments, please refer to Figure 10 The method for determining the target pressure differential range includes steps S1001 to S1005.

[0135] S1001: Determine the maximum differential voltage threshold based on the rated contact resistance and maximum power handling capacity of the magnetic latching switch module.

[0136] In this embodiment, it is assumed that all magnetic latching relays used in the energy-saving control device 100 are of the same model and specification, and therefore, the rated contact resistance and maximum power handling capacity of each magnetic latching relay are the same. Thus, a uniform maximum differential voltage threshold can be calculated for each magnetic latching relay. In one example, the rated contact resistance of the magnetic latching relay is R, and the maximum power handling capacity is P; therefore, the maximum differential voltage threshold can be calculated. .

[0137] S1002: Determine the N-level candidate pressure difference range.

[0138] Among them, the candidate pressure difference interval includes a first pressure difference threshold and a second pressure difference threshold, the first pressure difference threshold is less than the second pressure difference threshold; the second pressure difference threshold of the (i+1)th level candidate pressure difference interval is greater than the second pressure difference threshold of the ith level candidate pressure difference interval; the second pressure difference threshold of the Nth level candidate pressure difference interval is the maximum pressure difference threshold; 1≤i<N.

[0139] It is understood that the maximum differential pressure threshold Vs is the peak value of the closure threshold. In order to better protect the magnetic latching relay, this application further determines the N-level candidate differential pressure range based on the maximum differential pressure threshold Vs, so as to select the target differential pressure range that can meet the operation requirements of the energy-saving control system and protect the magnetic latching relay from the N-level candidate differential pressure range.

[0140] S1003: For a candidate differential pressure range, based on the candidate differential pressure range, the first voltage signal, and the second voltage signal, control the on / off state of the magnetic latching switch module to obtain the on / off ratio of the magnetic latching switch module.

[0141] Taking the first-level candidate voltage difference range as [0, 5V] as an example, the energy management subunit is set to activate the corresponding magnetic latching relay when the difference between the first voltage signal and the second voltage signal falls within the first-level candidate voltage difference range [0, 5V]. The drive control module 30 detects the first DC bus voltage to confirm the number of elevator runs and the number of times the difference between the first DC bus voltage and the battery voltage is [0, 5V], and calculates the on / off ratio corresponding to the first-level candidate voltage difference range. The on / off ratio indicates the ratio of the preset number of elevator runs to the number of times the magnetic latching switch module 20 is activated within that preset number of elevator runs. That is, when the drive control module 30 controls the magnetic latching relay to activate according to the first-level candidate voltage difference range [0, 5V], if the elevator runs 10 times and the voltage difference between the first DC bus voltage and the battery voltage is within [0, 5V] twice, then the on / off ratio corresponding to the first-level candidate voltage difference range [0, 5V] can be determined to be 20%.

[0142] S1004: When the on / off ratio is greater than or equal to the preset ratio threshold, the candidate differential pressure range is determined as the target differential pressure range.

[0143] If the on / off ratio is greater than or equal to the preset ratio threshold, the candidate differential pressure range can be directly determined as the target differential pressure range.

[0144] S1005: If the on / off ratio is less than the preset ratio threshold, for the next level candidate differential pressure range, return to the step of controlling the on / off state of the magnetic latching switch module according to the candidate differential pressure range, the first voltage signal and the second voltage signal, and obtaining the on / off ratio of the magnetic latching switch module to continue execution until the target differential pressure range is determined; or, until the next level candidate differential pressure range is the Nth level candidate differential pressure range, and the Nth level candidate differential pressure range is determined as the target differential pressure range;

[0145] Following the example above, if the on / off ratio corresponding to the first-level candidate differential pressure range [0, 5V] is 20%, while the preset ratio threshold is 90%, then the first-level candidate differential pressure range is excluded, and testing of the second-level candidate differential pressure range begins to obtain the on / off ratio corresponding to the second-level candidate differential pressure range. This iterative testing continues until the target differential pressure range is determined, or until testing of all N candidate differential pressure ranges is completed.

[0146] After determining the target differential pressure range, the magnetic latching switch module 20 can be turned on according to the target differential pressure range; or, the second differential pressure threshold in the target differential pressure range can be determined as the target closing threshold. When the difference between the second voltage signal of the inverter and the first voltage signal of the battery module 10 is less than the target closing threshold, the corresponding first magnetic latching relay K1 and second magnetic latching relay K2 can be turned on.

[0147] In one exemplary embodiment, please refer to Figure 11 First, the energy-saving control device 100 is powered on. After power-on, it checks whether the energy-saving control system has faults such as overcurrent, overtemperature, and overvoltage, and whether the elevator is under maintenance. If there are no serious faults such as overcurrent, overtemperature, and overvoltage, and the elevator is not under maintenance, then it enters the control link of the magnetic latching switch module 20.

[0148] When the difference between the second voltage signal of the frequency converter and the first voltage signal of the battery module 10 is detected to be within the target differential voltage range, the drive control module 30 can activate the corresponding first magnetic latching relay K1 and second magnetic latching relay K2. If the target differential voltage range has not yet been determined, the activation of the first magnetic latching relay K1 and the second magnetic latching relay K2 is determined based on the current candidate differential voltage range.

[0149] The drive control module 30 can detect whether the battery module 10 is undervoltage through the battery monitoring submodule 43. In one example, if the voltage of the battery module 10 is less than w*Vm, it can be determined that the battery module 10 is undervoltage, where w can be 0.8 and Vm is the normal voltage of the battery module 10. When the battery module 10 is detected to be undervoltage, the drive control module 30 controls the first magnetic latching relay K1 to disconnect, so that the inverter and the battery module 10 can form a current loop through the diode D2 and the second magnetic latching relay K2 to charge the battery module 10. Afterwards, the drive control module 30 continues to calculate the battery capacity of the battery module 10 through the battery voltage and current information detected by the battery monitoring submodule 43 to determine whether the battery module 10 is fully charged. When the battery is fully charged, the first magnetic latching relay K1 is turned on.

[0150] When a relay ages or is damaged, its contact resistance increases. To avoid increased power consumption, heat generation, and voltage drop caused by increased relay resistance, the energy-saving control device 100 of this application can also incorporate a contact resistance detection circuit. During the conduction of the first magnetic latching relay K1 and / or the second magnetic latching relay K2, the drive control module 30 detects the voltage across the relays through the contact resistance detection circuit and calculates the relay contact resistance at this time. If it exceeds the preset increase range of the rated contact resistance of the magnetic latching relay (e.g., 35%), the relay is determined to be abnormal, the relay is disconnected, and a fault is reported; if it is within the range, the relay remains closed.

[0151] In summary, the energy-saving control device of this application can reduce the overall energy consumption and heat generation during relay closure, thereby extending the relay's lifespan. This invention abandons the use of traditional ordinary relays and instead uses magnetically latched relays. Traditional relays require continuous power supply to the coil, leading to increased overall energy consumption and coil overheating. The continuous current-induced heat generation reduces the relay's lifespan. Magnetically latched relays solve these two problems: they only require current during switching, reducing energy consumption, and the lack of continuous current supply effectively addresses coil overheating, thus extending the relay's lifespan.

[0152] Meanwhile, this application also improves the driving control method of the magnetic latching relay, ensuring the stability and reliability of the magnetic latching relay in use. This invention provides a stable and reliable magnetic latching relay control circuit capable of receiving control signals to control the relay's opening and closing, improving the flexibility of relay control and enabling real-time switching of the relay's state. A pulse filtering circuit is also added to avoid short-term pulse and spike interference affecting circuit operation, improving the stability of the control circuit and accurately applying control signals to the magnetic latching relay. Finally, a power-off reset circuit is added to ensure that the relay resets to the open state after a power failure. Through the hierarchical design of the circuit, the stability and reliability of the magnetic latching relay control are ensured.

[0153] Finally, this application also optimizes the relay control strategy, reducing the impact on relay closure and enhancing relay monitoring. This invention provides a control logic for a magnetic latching relay. Through an adaptive threshold determination method, it selects the minimum closure threshold for the application scenario, reducing the impact on the magnetic latching relay during closure and extending its service life. Simultaneously, a relay detection method is added, determining whether the relay can continue to be used by detecting its contact resistance, reducing the impact of relay aging or damage on the energy-saving system and ensuring system safety and reliability. These strategies ensure more stable and reliable use of the magnetic latching relay, and allow for fault reporting and timely relay replacement in case of problems.

[0154] In the description of this specification, references to terms such as "some embodiments," "other embodiments," and "ideal embodiments" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0155] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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, they should be considered to be within the scope of this specification.

[0156] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An energy-saving control device, characterized in that, include: Battery module; A magnetic latching switch module includes at least one first magnetic latching relay and at least one second magnetic latching relay; a first terminal of the first magnetic latching relay is connected to a first DC bus of the frequency converter module, a second terminal of the first magnetic latching relay is connected to the positive terminal of the battery module, and a control terminal of the first magnetic latching relay is connected to a drive control module; a first terminal of the second magnetic latching relay is connected to a second DC bus of the frequency converter module, a second terminal of the second magnetic latching relay is connected to the negative terminal of the battery module, and a control terminal of the second magnetic latching relay is connected to the drive control module. The drive control module is used to acquire a first voltage signal of the battery module, a second voltage signal of the first DC bus, and a target differential voltage range; when the differential voltage between the first voltage signal and the second voltage signal is within the target differential voltage range, it outputs a first A-pulse drive current to the first magnetic latching relay and the second magnetic latching relay; when the second voltage signal at the positive terminal of the battery module is less than a preset voltage threshold, it outputs a first B-pulse drive current to the first magnetic latching relay and a first A-pulse drive current to the second magnetic latching relay; the first A-pulse drive current is used to control the magnetic latching relay to turn on, and the first B-pulse drive current is used to control the magnetic latching relay to turn off.

2. The energy-saving control device according to claim 1, characterized in that, The drive control module includes: A battery monitoring submodule, connected to the battery module, is used to monitor the first voltage signal of the battery module; An energy management submodule, connected to the DC bus and the battery module, is used to determine whether the voltage difference between the first voltage signal and the second voltage signal is within the target voltage difference range, and outputs a pulse control signal when the voltage difference between the first voltage signal and the second voltage signal is within the target voltage difference range; The drive submodule, connected to the energy management submodule and the magnetic latching switch module, is used to isolate and filter the pulse control signal to generate a first pulse drive current.

3. The energy-saving control device according to claim 2, characterized in that, The drive control module also includes: The power supply submodule is connected to the energy management submodule and the drive submodule respectively, and is used to provide power signals to the energy management submodule and the drive submodule respectively; The reset submodule is connected to the power supply submodule and the magnetic latching switch module, respectively. It is used to store electrical energy when the power supply signal is received, and to release the stored electrical energy to output a second pulse drive current when the power supply signal is in an abnormal state. The second pulse drive current is used to control the magnetic latching switch module to be in the open state.

4. The energy-saving control device according to claim 3, characterized in that, The reset submodule includes: An energy storage unit, wherein a first end of the energy storage unit is connected to the power submodule, and a second end of the energy storage unit is grounded; An operational amplifier unit is provided, wherein a first input terminal of the operational amplifier unit is connected to the power supply submodule, and a second input terminal of the operational amplifier unit is connected to a third terminal of the energy storage unit; the operational amplifier unit is used to output a first control signal based on the power supply signal when the power supply signal is in an abnormal state; the operational amplifier unit is also used to output a second control signal based on the electrical energy stored in the energy storage unit when the power supply signal is in an abnormal state. A reset unit is provided, wherein the first input terminal of the reset unit is connected to the output terminal of the operational amplifier unit, the second input terminal of the reset unit is connected to the power supply submodule, the third input terminal of the reset unit is grounded, and the output terminal of the reset unit is connected to the magnetic latching switch module; the reset unit is used to output a second pulse drive current when the second control signal is received.

5. The energy-saving control device according to claim 1, characterized in that, The frequency conversion module includes at least one frequency converter; The second DC bus of the frequency converter module is connected to the negative terminal of the battery module.

6. The energy-saving control device according to claim 5, characterized in that, The energy-saving control device also includes a unidirectional conduction module, the current input terminal of which is connected to the first DC bus, and the current output terminal of which is connected to the positive terminal of the battery module.

7. The energy-saving control device according to claim 3, characterized in that, The driver submodule includes: A signal isolation unit is connected to the energy management submodule and the power supply submodule respectively, and is used to isolate the pulse control signal and the power supply signal, and output a pulse drive signal according to the pulse control signal and the power supply signal; A filtering unit, connected to the signal isolation unit, is used to filter the pulse drive signal; The driving unit is connected to the filtering unit and the magnetic latching switch module respectively, and is used to generate a first pulse driving current according to the filtered pulse driving signal.

8. An energy-saving control system, characterized in that, It includes a load, a frequency converter connected to the load, and an energy-saving control device as described in any one of claims 1-7.

9. An energy-saving control method, applied to the energy-saving control device according to any one of claims 1-7; characterized in that, include: Acquire the first voltage signal of the battery module, the second voltage signal of the DC bus, and the target differential voltage range; A first pulse drive current is generated based on the first voltage signal, the second voltage signal, and the target differential pressure range; the first pulse drive current is used to control the on / off state of the magnetic latching switch module.

10. The energy-saving control method according to claim 9, characterized in that, The method for determining the target pressure differential range includes: The maximum differential voltage threshold is determined based on the rated contact resistance and maximum power handling capacity of the magnetic latching switch module. Determine N levels of candidate differential pressure intervals; wherein, the candidate differential pressure intervals include a first differential pressure threshold and a second differential pressure threshold, the first differential pressure threshold being less than the second differential pressure threshold; the second differential pressure threshold of the (i+1)th level candidate differential pressure interval is greater than the second differential pressure threshold of the ith level candidate differential pressure interval; the second differential pressure threshold of the Nth level candidate differential pressure interval is the maximum differential pressure threshold; 1≤i<N; For a candidate differential pressure range, the on / off state of the magnetic latching switch module is controlled according to the candidate differential pressure range, the first voltage signal, and the second voltage signal to obtain the on / off ratio of the magnetic latching switch module; When the on / off ratio is greater than or equal to a preset ratio threshold, the candidate differential pressure range is determined as the target differential pressure range; If the on / off ratio is less than the preset ratio threshold, for the next level candidate differential pressure range, return to the step of controlling the on / off state of the magnetic latching switch module according to the candidate differential pressure range, the first voltage signal, and the second voltage signal, and obtaining the on / off ratio of the magnetic latching switch module, and continue to execute until the target differential pressure range is determined; or, until the next level candidate differential pressure range is the Nth level candidate differential pressure range, and determine the Nth level candidate differential pressure range as the target differential pressure range; The on / off ratio is used to indicate the ratio of a preset number of elevator runs to the number of times the magnetic latching switch module is turned on within the preset number of elevator runs.

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