Current modulation apparatus, method and power supply system
By generating modulated current through the signal acquisition module and the current modulation module, the problem of disordered light emission sequence when the brightness of airport berth guidance lights changes periodically is solved, and synchronous changes in the brightness of the lights and uniform light emission are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- AIRSAFE AIRPORT EQUIP CO LTD
- Filing Date
- 2023-01-10
- Publication Date
- 2026-07-21
AI Technical Summary
The problem of disordered light emission sequence when the brightness of airport parking space guide lights changes periodically.
The system employs a signal acquisition module and a current modulation module to obtain the supply current value of the target load, generate a modulation current, and attach it to the feedback signal of the supply current, so that the supply current changes periodically according to a preset method.
It achieves synchronized changes in lamp brightness, avoids error accumulation caused by long-term use, ensures synchronized flashing of multiple lamps, and solves the problem of disordered light emission sequence.
Smart Images
Figure CN116209114B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of lighting, and in particular to a current modulation device, method and power supply system. Background Technology
[0002] Currently, berth guidance lights, used to guide aircraft to their designated parking positions, typically employ either a constant brightness emission mode or a periodically changing brightness mode. If periodic brightness changes are required, a common method is to use a dimmer to power the lights. This involves using a dimmer to change the supply current, thereby altering the light brightness level. The intelligent lights then periodically change the brightness. The dimmer adjustment method usually involves manually adjusting the dimmer to the target level, where the brightness remains constant until a further manual adjustment is needed.
[0003] If the berth guidance lights have a constant brightness during use, the monotonous brightness will make them less intuitive, causing pilots to be unable to lock onto the designated position in time, which undoubtedly increases the difficulty of flight and creates safety hazards.
[0004] Therefore, a more common approach now is to use a method where the brightness of the lighting fixtures changes periodically. Specifically, the dimmer typically used includes a dimmer control module and a dimmer current monitoring module. During operation, the dimmer current monitoring module obtains the output current from the dimmer's output terminal that supplies power to the load and feeds the result back to the dimmer control module for analysis and processing. Next, the dimmer control module adjusts the output current value to the specified level. Through this continuous feedback and adjustment process from the dimmer current monitoring module to the controller, the brightness level of the berth guide lights can be adjusted. When the power supply current is input into the light fixture, the control chip within the fixture will control its brightness to change periodically according to the preset level.
[0005] The above solutions require lighting fixtures with periodic brightness changes, relying on their own control chips to achieve these changes, making it difficult to achieve zero error. In actual use, any error, even if extremely small for a single fixture, can accumulate over time and become a potential problem affecting the guiding effect of the lighting. This means multiple sets of lights may fail to flash synchronously, resulting in a disordered lighting sequence.
[0006] In response to the above situation, this application proposes a current modulation device, method, and power supply system to solve the problem of disordered light emission sequence when the brightness of airport berth guidance lights changes periodically. Summary of the Invention
[0007] To address the problem of disordered light emission sequence when the brightness of airport berth guidance lights changes periodically, this application provides a current modulation device, method, and power supply system.
[0008] Firstly, the current modulation device provided in this application adopts the following technical solution: A current modulation device includes a signal acquisition module and a current modulation module, wherein the signal acquisition module and the current modulation module are respectively used to couple and connect with the power supply current line of the target load; The signal acquisition module is used to periodically acquire the current value of the power supply current of the target load, and the current modulation module is used to generate a corresponding modulation current based on the current value of the power supply current, and attach the modulation current to the feedback signal of the power supply current so that the power supply current changes periodically in a preset manner.
[0009] By adopting the above technical solution, the feedback signal of the power supply current serves as the basis for adjusting the power supply current. When the signal acquisition module obtains the current value of the power supply current of the target load, the generated modulation current has a phase that matches the power supply current. When the modulation current is added to the feedback signal of the power supply current, the feedback signal can simultaneously include feedback for the power supply current and feedback for the modulation current, thereby causing the power supply current to change periodically in a preset manner.
[0010] This method makes good use of the existing functional modules of common power supply circuits and improves upon them. It not only meets the requirement of periodic changes in lamp brightness while being simple to operate, low in component cost, and easy to wire, but also broadens the range of lamp applications because this solution changes the feedback signal of the power supply current. Users do not need to use lamps with periodic brightness change function, such as ordinary LED and halogen lamps.
[0011] In addition, since multiple lamps are connected in series in the load circuit in this solution and are synchronously input with periodically changing power supply current, the brightness changes of the lamps are always synchronized, avoiding the problem of multiple lamps not being able to flash synchronously and the lighting sequence being disordered due to the accumulation of errors caused by long-term use.
[0012] Optionally, the current modulation module adds the modulation current to the feedback signal of the supply current in an inductive manner.
[0013] Optionally, the signal acquisition module includes a first current transformer. The primary side of the first current transformer is connected to the power supply current line of the target load, and the secondary side of the first current transformer serves as the output terminal of the signal acquisition module, used to transmit the current value of the power supply current of the target load to the current modulation module.
[0014] By adopting the above technical solution, a current transformer is an instrument that measures a large primary current by converting a small secondary current into a large primary current based on the principle of electromagnetic induction. It consists of a closed iron core and windings. In this solution, the primary side of the current-modulated current transformer is connected to the power supply current line of the target load, enabling it to obtain the magnitude and phase of the power supply current. Its secondary side can then transmit the obtained power supply current signal to the current modulation module.
[0015] Optionally, the first current transformer is a clamp-on current transformer.
[0016] By adopting the above technical solution, the clamp-on current transformer has no primary conductor and primary insulation, and its magnetic circuit can be opened in a hinge manner. It has the advantages of good low-current characteristics, small variation in the position of the current-carrying conductor, and strong anti-interference ability.
[0017] Optionally, the current modulation module includes: The first processing unit is used to acquire the current value of the power supply current and generate a modulation control signal based on the current value of the power supply current. The second processing unit is used to generate the modulation current based on the modulation control signal.
[0018] Optionally, the first processing unit includes: A digital-to-analog converter is used to acquire the current value of the power supply current and perform digital-to-analog conversion on the current value of the power supply current to generate an initial sampling signal; A logic operator is used to perform logical operations on the initial sampled signal based on preset rules to generate the modulation control signal.
[0019] Optionally, the second processing unit includes a driving circuit and a conversion circuit. The driving circuit is used to generate a driving signal based on the modulation control signal; the conversion circuit is used to convert a constant voltage source into a constant current source according to the driving signal to generate the modulation current.
[0020] By adopting the above technical solution, the target circuit is one that requires constant current power supply, such as the power supply circuit for LED lights. To meet the brightness requirements of the LED light source, based on the volt-ampere characteristics of LEDs, a constant current method is used to drive the LED lights to ensure that the output current remains constant within the output power range. When the number of lamps connected in parallel to the load output terminal changes or the resistance changes, the output current does not change, and the current flowing through each lamp is the same, thus ensuring that the lamp emits light relatively uniformly.
[0021] Therefore, this solution employs a power conversion circuit to convert a constant voltage source into a constant current source, in order to maintain synchronization with the constant current load output of the target power supply line. Additionally, this power conversion circuit requires the aforementioned drive circuit to operate, and the drive circuit must be capable of driving the power conversion circuit to output a periodically varying modulated current.
[0022] Optionally, the current modulation module further includes an induction coil, which is inductively connected to a feedback circuit in the power supply current line used to collect the feedback signal, so as to add the modulation current to the feedback signal of the power supply current.
[0023] Optionally, the feedback circuit is a second current transformer.
[0024] Secondly, this application provides a power supply system, which adopts the following technical solution: A power supply system includes a main power supply circuit and the current modulation device. The main power supply circuit includes a power source, a power supply current line electrically connected to the power source and the load respectively, a feedback circuit for acquiring the feedback signal, and a controller. The feedback circuit is used to feed back the feedback signal, which is superimposed with both the modulation current and the supply current, to the controller. The controller controls the power supply to output a periodically varying supply current on the power supply line according to the preset method, based on the feedback signal.
[0025] Thirdly, this application provides a current modulation method, which adopts the following technical solution: A current modulation method includes the following steps: Periodically collect the current value of the supply current of the target load; A corresponding modulation current is generated based on the current value of the supply current; The modulation current is added to the feedback signal of the power supply current so that the power supply current changes periodically in a preset manner.
[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. This solution makes good use of the existing functional modules of common power supply circuits and improves upon them. It not only meets the requirement of periodic changes in lamp brightness while being simple to operate, low in component cost, and easy to wire, but also broadens the application range of lamps because this solution changes the feedback signal of the power supply current. Users do not need to use lamps with periodic brightness change function, such as ordinary LED and halogen lamps.
[0027] 2. Since the lamps are connected in parallel to the load output in this solution and the power supply current is synchronously input in a periodic manner, the brightness changes of the lamps are always synchronized, avoiding the problem of multiple lamps not being able to flash synchronously and the lighting sequence being disordered due to the accumulation of errors caused by long-term use. Attached Figure Description
[0028] Figure 1 This is a circuit connection diagram of a current modulation device according to an embodiment of this application. Detailed Implementation
[0029] The present application will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the application and are not intended to limit the scope of the application.
[0030] In the following description, numerous specific details are set forth for illustrative purposes in order to provide a thorough understanding of the inventive concept. As part of this specification, some of the accompanying drawings of this disclosure are block diagrams illustrating structures and devices to avoid complicating the disclosed principles. For clarity, not all features of the actual embodiment need to be described. References to “an embodiment” or “an embodiment” in this disclosure mean that a particular feature, structure, or characteristic described in connection with that embodiment is included in at least one embodiment, and multiple references to “an embodiment” or “an embodiment” should not be construed as necessarily referring to the same embodiment.
[0031] Unless explicitly defined, the terms “a,” “an,” and “the” are not intended to refer to a singular entity, but rather to include a general category whose specific examples can be used for illustration. Therefore, the use of the terms “a” or “an” can mean any number of at least one, including “a,” “one or more,” “at least one,” and “one or more.” The term “or” means any of the options and any combination of the options, including all options unless explicitly indicated that the options are mutually exclusive. The phrase “at least one of” when combined with a list of items refers to a single item in the list or any combination of items in the list. The phrase does not require all items listed unless explicitly defined as such.
[0032] This application discloses a current modulation device. (Refer to...) Figure 1A current modulation device includes a signal acquisition module and a current modulation module. The signal acquisition module is coupled to the power supply current line of the target load and is used to periodically acquire the current value of the power supply current of the target load. The current modulation module is coupled to the power supply current line of the target load and is used to generate a corresponding modulation current based on the current value of the power supply current, and to attach the modulation current to the feedback signal of the power supply current so that the power supply current changes periodically according to a preset method.
[0033] The feedback signal of the power supply current serves as the basis for adjusting the power supply current. After the signal acquisition module obtains the current value of the power supply current of the target load, the generated modulation current has a phase that matches the power supply current. When the modulation current is added to the feedback signal of the power supply current, the feedback signal can simultaneously include feedback for the power supply current and feedback for the modulation current, thereby causing the power supply current to change periodically in a preset manner.
[0034] This method makes good use of the existing functional modules of common power supply circuits and improves upon them. It not only meets the requirement of periodic changes in lamp brightness while being simple to operate, low in component cost, and easy to wire, but also broadens the range of lamp applications because this solution changes the feedback signal of the power supply current. Users do not need to use lamps with periodic brightness change function, such as ordinary LED and halogen lamps.
[0035] In addition, since multiple lamps are connected in series in the load circuit in this solution and are synchronously input with periodically changing power supply current, the brightness changes of the lamps are always synchronized, avoiding the problem of multiple lamps not being able to flash synchronously and the lighting sequence being disordered due to the accumulation of errors caused by long-term use.
[0036] Specifically, the aforementioned signal acquisition module may include different components for performing the aforementioned signal acquisition. This application specifically, but not in a limiting sense, provides a solution: the signal acquisition module includes a first current transformer, the primary side of which is connected to the power supply current line of the target load, and the secondary side of which serves as the output terminal of the signal acquisition module, used to transmit the current value of the power supply current of the target load to the current modulation module.
[0037] To explain, a current transformer is an instrument that measures a large primary current by converting a small secondary current into a large primary current based on the principle of electromagnetic induction. It consists of a closed iron core and windings. In this scheme, the primary side of the current-modulated current transformer is connected to the power supply current line of the target load, enabling it to obtain the magnitude and phase of the power supply current. Its secondary side can then transmit the obtained power supply current signal to the current modulation module.
[0038] Furthermore, in this embodiment, the first current transformer is a clamp-on current transformer. In other embodiments, the first current transformer may be of different types. A clamp-on current transformer has no primary conductor and primary insulation, and its magnetic circuit can be opened in a hinged manner. It has advantages such as good low-current characteristics, low variation in the position of the current-carrying conductor, and strong anti-interference capability.
[0039] The current modulation module is used to couple with the power supply current line of the target load and to generate a corresponding modulation current based on the current value of the power supply current. This modulation current is then added to the feedback signal of the power supply current to cause the power supply current to change periodically according to a preset pattern. Specifically, in different embodiments, the current modulation module can add the modulation current to the feedback signal of the power supply current in different ways. As an example, the current modulation module adds the modulation current to the feedback signal of the power supply current in an inductive manner.
[0040] In different embodiments, the current modulation module may include different components to achieve the above functions. This application specifically, but not in a limited way, provides one solution: The current modulation module includes a first processing unit and a second processing unit. The first processing unit is used to acquire the current value of the supply current and generate a modulation control signal based on the current value of the supply current. The second processing unit is used to generate a modulated current based on the modulation control signal.
[0041] Specifically, the first processing unit includes a digital-to-analog converter (DAC) and a logic unit. The DAC is used to acquire the current value of the supply current and perform digital-to-analog conversion on the current value to generate an initial sampling signal. The logic unit is used to perform logical operations on the initial sampling signal based on preset rules to generate a modulation control signal.
[0042] Furthermore, the above-mentioned logical operation on the initial sampled signal based on the preset rules is specifically as follows: the logic unit stores preset values. When the initial sampled signal is input into the logic unit, the logic unit will calculate the difference between the current value carried by the initial sampled signal and the preset value, and use the difference as the input data value of the PID algorithm. The PID algorithm outputs the above-mentioned logical operation result.
[0043] Furthermore, the aforementioned preset values can be determined based on the usage scenario. For example, in the usage scenario of airport navigation lights, users usually choose to use a dimmer as the power supply line. Common dimmers have five preset output current levels, namely 2.8 amps, 3.4 amps, 4.1 amps, 5.2 amps and 6.6 amps. Correspondingly, the aforementioned preset value can be in the range of 0-2.8 amps, specifically 2 amps.
[0044] Furthermore, in different embodiments, the aforementioned periodic changes can be within different ranges, as long as the range of power supply current variation is sufficient to ensure that the brightness of the lamp meets the requirements for being recognizable by the pilot. As an example, in this embodiment, the range is between the aforementioned preset value and the preset current value of the corresponding dimmer setting, and the output current value changes in a sinusoidal pattern, with the peak being the preset current value of the corresponding dimmer setting, the trough being the aforementioned preset value, and the frequency being 0.5 Hz.
[0045] Specifically, the second processing unit includes a driving circuit and a conversion circuit. The driving circuit is used to generate a driving signal based on the modulation control signal; the conversion circuit is used to convert the constant voltage source into a constant current source according to the driving signal to generate a modulation current.
[0046] To illustrate, the target circuit is one that requires a constant current source, such as the power supply circuit for LED lights. To meet the brightness requirements of the LED light source, a constant current method is used to drive the LED lights based on the volt-ampere characteristics of LEDs, ensuring that the output current remains constant within the output power range. When the number of lamps connected in parallel to the load output terminal changes or their resistance changes, the output current does not change; the current flowing through each lamp is the same, thus ensuring relatively uniform light emission from the lamps.
[0047] Therefore, this solution employs a power conversion circuit to convert a constant voltage source into a constant current source, in order to maintain synchronization with the constant current load output of the target power supply line. Additionally, this power conversion circuit requires the aforementioned drive circuit to operate, and the drive circuit must be capable of driving the power conversion circuit to output a periodically varying modulated current.
[0048] Furthermore, the current modulation module also includes an induction coil, which is inductively connected to a feedback circuit in the power supply current line used to collect feedback signals, so as to add the modulation current to the feedback signal of the power supply current. The feedback circuit is a second current transformer.
[0049] Specifically, the primary side of the second current transformer is connected to the output terminal of the power supply line, and the secondary side is connected to the controller of the power supply line for adjusting the power supply current. The induction coil is sleeved on the primary side of the second current transformer, so that the modulation current and the feedback signal added to the power supply current can be combined. The second current transformer then sends the additional feedback signal to the controller of the power supply line to complete the current modulation.
[0050] This application provides a power supply system, including a main power supply circuit and a current modulation device. The main power supply circuit includes a power source, a power supply current line electrically connected to the power source and a load, a feedback circuit for acquiring feedback signals, and a controller. The feedback circuit feeds back a feedback signal, which is a superposition of the modulation current and the power supply current, to the controller. Based on the feedback signal, the controller controls the power source to output a power supply current that changes periodically in a preset manner on the power supply current line.
[0051] This application provides a current modulation method, including the following steps: Periodically collect the current value of the supply current of the target load; The corresponding modulation current is generated based on the current value of the supply current; A modulated current is added to the feedback signal of the supply current so that the supply current changes periodically in a preset manner.
[0052] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A current modulation device, characterized in that, The current modulation device includes a signal acquisition module and a current modulation module, which are respectively used to couple and connect with the power supply current line of the target load. The signal acquisition module is used to periodically acquire the current value of the power supply current of the target load, and the current modulation module is used to generate a corresponding modulation current based on the current value of the power supply current, and attach the modulation current to the feedback signal of the power supply current so that the power supply current changes periodically in a preset manner. The current modulation module includes: The first processing unit is used to acquire the current value of the power supply current and generate a modulation control signal based on the current value of the power supply current. The second processing unit is used to generate the modulation current based on the modulation control signal; The feedback signal of the power supply current serves as the basis for adjusting the power supply current. After the signal acquisition module obtains the current value of the power supply current of the target load, the generated modulation current has a phase that matches the power supply current. When the modulation current is added to the feedback signal of the power supply current, the feedback signal includes feedback for the power supply current and feedback for the modulation current, so that the power supply current changes periodically in a preset manner.
2. The current modulation device according to claim 1, characterized in that, The current modulation module adds the modulation current to the feedback signal of the supply current in an inductive manner.
3. The current modulation device according to claim 2, characterized in that, The signal acquisition module includes a first current transformer. The primary side of the first current transformer is connected to the power supply current line of the target load, and the secondary side of the first current transformer serves as the output terminal of the signal acquisition module, used to transmit the current value of the power supply current of the target load to the current modulation module.
4. The current modulation device according to claim 3, characterized in that, The first current transformer is a clamp-on current transformer.
5. The current modulation device according to claim 1, characterized in that, The first processing unit includes: A digital-to-analog converter is used to acquire the current value of the power supply current and perform digital-to-analog conversion on the current value of the power supply current to generate an initial sampling signal; A logic operator is used to perform logical operations on the initial sampled signal based on preset rules to generate the modulation control signal.
6. The current modulation device according to claim 1, characterized in that, The second processing unit includes a driving circuit and a conversion circuit. The driving circuit is used to generate a driving signal based on the modulation control signal. The conversion circuit is used to convert a constant voltage source into a constant current source according to the driving signal to generate the modulation current.
7. The current modulation device according to any one of claims 1, 5, and 6, characterized in that, The current modulation module further includes an induction coil, which is inductively connected to a feedback circuit in the power supply current line used to collect the feedback signal, so as to add the modulation current to the feedback signal of the power supply current.
8. The current modulation device according to claim 7, characterized in that, The feedback circuit is the second current transformer.
9. A power supply system, characterized in that, The device includes a main power supply circuit and a current modulation device as described in any one of claims 1-7. The main power supply circuit includes a power source, a power supply current line electrically connected to the power source and the load respectively, a feedback circuit for acquiring the feedback signal, and a controller. The feedback circuit is used to feed back the feedback signal, which is superimposed with both the modulation current and the supply current, to the controller. The controller controls the power supply to output a periodically varying supply current on the power supply line according to the preset method, based on the feedback signal.
10. A current modulation method applied to the current modulation device as described in any one of claims 1-7, characterized in that, Includes the following steps: Periodically collect the current value of the supply current of the target load; A corresponding modulation current is generated based on the current value of the supply current; The modulation current is added to the feedback signal of the power supply current so that the power supply current changes periodically in a preset manner.