A spatial signal acquisition end LED driving circuit and a monitoring system

Abstract

The application provides a kind of space signal acquisition end LED driving circuit and monitoring system, comprising: space signal receiving and resonance module, rectification filtering module, voltage reduction voltage stabilizing module, multi-channel LED driving module and monitoring test module.Space signal receiving and resonance module is used to receive the energy transmitted by space signal transmitting end;Rectification filtering module is used to convert the alternating current energy obtained by receiving end into direct current electric energy and carry out filtering processing;Voltage reduction voltage stabilizing module is used to convert the voltage after rectification into stable output voltage suitable for LED driving;Multi-channel LED driving module includes a plurality of parallelly arranged LED driving branches;Monitoring test module is used to realize the detection of circuit key node and the working state of each LED driving branch;The advantages of the application are: conducive to reducing the heat of receiving end, conducive to improving the space adaptation ability, conducive to improving the LED brightness consistency, conducive to improving the LED brightness regulation stability, conducive to improving the detection and debugging efficiency.

Description

Technical Field

[0001] This invention relates to the field of space signal reception and LED driving control technology, specifically to an LED driving circuit and monitoring system applied to a space signal acquisition terminal. Background Technology

[0002] In space signal transmission systems, the receiving end typically acquires electrical energy transmitted from the space signal transmitter via a receiving coil, and then supplies power to subsequent loads after rectification, filtering, and voltage regulation. For terminals or functional modules with light-emitting display functions, the receiving end circuit, in addition to performing energy reception and power conversion, also needs to provide stable driving for multiple LED loads.

[0003] Existing LED driving solutions for space signal acquisition typically suffer from the following problems: 1. The receiving end generates a lot of heat. The electrical energy obtained at the space signal acquisition terminal is usually high-frequency induced energy, which needs to be resonated, rectified, and filtered to form a usable voltage for the subsequent stage. If the forward voltage drop of the rectifier device is large, or if the matching between the preceding resonant and rectifier structures is unreasonable, it will cause significant power loss, which in turn will lead to increased temperature rise at the receiver, affecting system stability and device reliability.

[0004] 2. The brightness uniformity of multiple LEDs is poor. In scenarios where multiple LEDs are driven in parallel, if the current control accuracy of each branch is insufficient or the power supply voltage is not stable, it can easily lead to deviations in the operating current between different branches, resulting in uneven LED brightness and affecting the display or lighting effect.

[0005] 3. Insufficient spatial adaptability. Some spatial signal acquisition applications have high requirements for circuit board thickness and device height, especially in miniaturized and thin products, where traditional device selection and layout methods are difficult to balance performance and structural space constraints.

[0006] 4. Inconvenient testing and debugging. When there are many drive branches, if there is a lack of test interfaces for each key node and each LED branch, it will be difficult to quickly determine the location of the problem during production testing, anomaly analysis and fault location, which will increase debugging costs.

[0007] Therefore, it is necessary to propose a new LED driving circuit for spatial signal acquisition, so as to ensure circuit miniaturization while taking into account low heat generation, high brightness consistency and good detectability. Summary of the Invention

[0008] In view of the above problems, the purpose of this invention is to provide an LED driving circuit and monitoring system for a space signal acquisition terminal, in order to solve the problems of excessive heat generation in the space signal acquisition terminal, insufficient brightness consistency of multiple LEDs, poor adaptability to space-constrained scenarios, and inconvenience in testing and debugging in the prior art.

[0009] The present invention provides an LED driving circuit and monitoring system for a space signal acquisition terminal, comprising: a space signal receiving and resonant module, a rectification and filtering module, a step-down and voltage regulation module, a multi-channel LED driving module, and a monitoring and testing module.

[0010] The space signal receiving and resonant module is used to receive energy transmitted from the space signal transmitter; it includes a receiving coil input terminal and a resonant capacitor network module connected to the receiving coil. The receiving coil and the resonant capacitor network module form a resonant circuit to improve the energy reception efficiency of space signals. The rectifier and filter module is connected after the space signal receiving and resonant module, and is used to convert the AC energy obtained by the receiving end into DC power and perform filtering. The step-down voltage regulator module is connected after the rectifier and filter module and is used to convert the rectified voltage into a stable output voltage suitable for LED driving. The multi-channel LED driver module is connected to the output of the buck regulator module and includes multiple parallel LED driver branches. Each LED driver branch includes at least one LED device and a current-limiting resistor connected in series with the LED device. Each LED driver branch is connected in parallel between the output voltage bus and the reference ground, so that each branch can operate independently under the same power supply conditions. The current-limiting resistors in the LED driver branches are high-precision resistors. By improving the consistency of the resistance values ​​of the current-limiting components in each branch, the deviation of the operating current between branches can be reduced, thereby improving the brightness consistency of the multi-channel LEDs. High-precision devices are preferably used for key resistors and capacitors in the circuit, thereby improving the overall parameter consistency of the circuit and making the LED brightness adjustment process more stable and smooth.

[0011] The monitoring and testing module is used to detect the operating status of key circuit nodes and each LED driver branch; it includes test points set at multiple preset nodes (key nodes), wherein the preset nodes include at least: rectifier output nodes, The output node of the buck regulator module, the reference ground node, the functional pin nodes of the buck regulator chip, and the branch detection nodes in each LED driver branch.

[0012] As a preferred embodiment of the present invention, the resonant capacitor network module uses a 1206 packaged resonant capacitor. This type of device, while meeting electrical parameter requirements, also considers device stability and engineering feasibility, which is beneficial for the stable operation of the receiving end resonant circuit.

[0013] As a preferred embodiment of the present invention, the rectifier-filter module includes eight Schottky diodes, which together form a rectifier circuit. By employing Schottky diodes, their low forward voltage drop characteristics can be utilized to reduce rectification losses, and their fast switching characteristics can be used to improve energy conversion efficiency during rectification. A filter capacitor network is provided at the rectifier output terminal to reduce output ripple and improve the input stability of subsequent stages.

[0014] As a preferred embodiment of the present invention, the buck regulator module adopts a Buck buck structure, including a switch control chip, an inductor, an output filter capacitor, and a feedback voltage divider network; the output voltage is adjusted in a closed loop through the feedback voltage divider network to obtain the set drive bus voltage.

[0015] As a preferred embodiment of the present invention, the feedback voltage divider network employs high-precision resistors and a voltage regulation branch module. The resistors are used to improve the setting accuracy and stability of the output voltage; the voltage regulation branch module is used to adjust the output voltage according to the actual LED load requirements.

[0016] As a preferred embodiment of the present invention, each of the branch detection nodes is set at the connection node between the current limiting resistor and the LED; by measuring at the connection node, the conduction status, voltage status and current operation of the corresponding branch can be determined, thereby facilitating branch consistency analysis and fault location.

[0017] The advantages and positive effects of this invention are: 1. This design helps reduce heat generation at the receiver. Eight Schottky diodes are used in the rectifier section, and a 1206-packaged resonant capacitor network is incorporated at the receiver. Because Schottky diodes have a low forward voltage drop, rectification losses are reduced; the resonant capacitor network contributes to stable operation of the front-end energy receiving circuit. Therefore, this structural combination helps reduce heat generation during the operation of the spatial signal acquisition unit.

[0018] 2. It helps improve spatial adaptability, enabling spatial signal reception, voltage regulation, and multi-channel LED driving functions within a smaller installation space, making it suitable for product designs with thickness requirements.

[0019] 3. It helps improve the consistency of LED brightness. It adopts multiple parallel independent LED driver branches and sets high-precision current-limiting resistors in each branch. At the same time, high-precision devices are used in the key voltage regulation and control network, which helps to reduce the dispersion of branch current and improve the consistency of LED brightness.

[0020] 4. It helps improve the stability of LED brightness adjustment. Because the circuit uses high-precision components and the output voltage is controlled by a feedback network in a closed loop, it helps improve the precision and stability of brightness adjustment and reduce brightness fluctuations.

[0021] 5. It helps improve testing and debugging efficiency. By setting test points at key nodes in the circuit and internal nodes of each LED branch, especially between the current limiting resistor and the LED, the working status of each branch can be measured without damaging the original circuit structure, thereby improving the efficiency of production testing, fault analysis and consistency verification. Attached Figure Description

[0022] Figure 1 This is a block diagram of the overall circuit principle of the LED driving circuit and monitoring system for the spatial signal acquisition terminal in this embodiment.

[0023] Figure 2 This is a schematic diagram of the spatial signal receiving front-end and rectifier filter circuit in this embodiment.

[0024] Figure 3 This is a schematic diagram of the step-down voltage regulation and output voltage adjustment circuit in this embodiment.

[0025] Figure 4 This is a schematic diagram of the distribution of multi-channel LED driver branches and test points in this embodiment.

[0026] Figure 5 This is a schematic diagram of the circuit board layout and device thinning in this embodiment. Detailed Implementation

[0027] In the following description, numerous specific details are set forth for illustrative purposes and to provide a thorough understanding of one or more embodiments. However, it will be apparent that these embodiments may also be implemented without these specific details. In other instances, well-known structures and devices are shown in block diagram form for ease of description of one or more embodiments.

[0028] See Figure 1-5 This embodiment provides a space signal acquisition terminal LED driving circuit and monitoring system, including: a space signal receiving and resonant module, a rectification and filtering module, a step-down voltage regulation module, a multi-channel LED driving module, and a monitoring and testing module.

[0029] The space signal receiving and resonant module is used to receive energy transmitted from the space signal transmitter. It includes a receiving coil input and a resonant capacitor network module connected to the receiving coil. The receiving coil and the resonant capacitor network module form a resonant circuit to improve the energy reception efficiency of the space signal. The resonant capacitor network module uses 1206 packaged resonant capacitors. This type of device, while meeting electrical parameter requirements, also considers device stability and engineering feasibility, which is beneficial for the stable operation of the receiving end resonant circuit.

[0030] The rectifier and filter module is connected after the space signal receiving and resonant module. It converts the AC energy received at the receiving end into DC power and performs filtering. The rectifier and filter module includes eight Schottky diodes, which form a rectifier circuit. By using Schottky diodes, their low forward voltage drop characteristics can be utilized to reduce rectification losses, and their fast switching characteristics can be used to improve the energy conversion efficiency during rectification. A filter capacitor network is set at the rectified output terminal to reduce output ripple and improve the input stability of subsequent stages.

[0031] The buck regulator module is connected after the rectifier and filter module to convert the rectified voltage into a stable output voltage suitable for LED driving. The buck regulator module employs a Buck converter structure and includes a switch control chip, inductor, output filter capacitor, and feedback voltage divider network. The feedback voltage divider network performs closed-loop regulation of the output voltage to obtain the set drive bus voltage. The feedback voltage divider network uses high-precision resistors and a voltage regulation branch module. The resistors improve the setting accuracy and stability of the output voltage; the voltage regulation branch module adjusts the output voltage according to the actual LED load requirements.

[0032] The multi-channel LED driver module is connected to the output of the step-down voltage regulator module and includes multiple parallel LED driver branches. Each LED driver branch includes at least one LED device and a current-limiting resistor connected in series with the LED device. Each LED driver branch is connected in parallel between the output voltage bus and the reference ground, so that each branch can operate independently under the same power supply conditions. The current-limiting resistors in the LED driver branches are high-precision resistors. By improving the consistency of the resistance values ​​of the current-limiting components in each branch, the deviation of the operating current between branches can be reduced, thereby improving the brightness consistency of the multi-channel LEDs. High-precision devices are preferably used for key resistors and capacitors in the circuit to improve the overall parameter consistency of the circuit, making the LED brightness adjustment process more stable and smooth. Each branch detection node is set at the connection node between the current-limiting resistor and the LED. By measuring at the connection node, the conduction state, voltage state, and current operation of the corresponding branch can be determined, facilitating branch consistency analysis and fault location.

[0033] The monitoring and testing module is used to detect the operating status of key circuit nodes and each LED driver branch; it includes test points set at multiple preset nodes (key nodes), wherein the preset nodes include at least: rectifier output nodes, The output node of the buck regulator module, the reference ground node, the functional pin nodes of the buck regulator chip, and the branch detection nodes in each LED driver branch.

[0034] The electronic components used in the circuit have a maximum thickness of no more than 1.1 mm. By controlling the height of the components and optimizing the circuit layout, the circuit can be made suitable for applications with limited installation space.

[0035] Furthermore, the receiver circuit in this embodiment can be divided into two parts, which will be described in detail below: The first part mainly constitutes an AC energy receiving and rectification network, used to capture energy from the magnetic field of the space signal transmitter and convert it into an unregulated DC voltage. The space signal receiving coil L1, together with resonant capacitors C1, C12, C16, and C17 (connected in parallel), forms a resonant circuit responsible for inducing the alternating magnetic field and converting electrical energy into AC. J1, J2, TP3, and TP56 serve as test points or connection points, facilitating the measurement and connection of the resonant signal. A bridge rectifier, composed of Schottky diodes D1, D3, D51, and D54 and D2, D4, D52, and D53 (connected in parallel to form a bridge), is responsible for converting the received AC into a pulsating DC voltage. The low forward voltage drop of the Schottky diodes contributes to improved energy efficiency.

[0036] The pulsating DC voltage enters the input terminal of the second section, where it is filtered and decoupled by an input filter capacitor bank (C2, C13, C3, TP1, C14, C5, TP2, etc., with different capacitance and voltage ratings). This is located adjacent to the chip's VIN1 / VIN2 pins (pins 1 and 2) and VIN pin (pin 10) to absorb voltage ripple from the rectifier and provide a source of instantaneous pulse current. The combination of multiple capacitors of varying sizes effectively suppresses wideband noise. This unregulated DC source is ultimately connected to the core control element U1, a synchronous buck DC / DC converter integrating control circuitry and a power MOSFET. The VIN pin is connected to the EN (enable) pin via a high level, meaning that U1 automatically starts operating whenever VIN input is detected. Pull-up resistor R1 (connected between the open-drain output PG pin (pin 8) and VIN) and the test points TP4, TP55, and the PG pin itself above it provide feedback on the output voltage status: the chip's PG pin is in a high-impedance state when the power supply is normal. The key node of this circuit is SW (pin 12), where a square wave signal with amplitude switching between VIN and GND is output. This is also where the core switching voltage measurement points TP5 and TP57 are located. The bootstrap capacitor C6, connected between BOOT (pin 4) and SW, provides the drive voltage required for the high-side N-channel MOSFET (upper transistor) inside U1 to turn on. The bootstrap resistor R2, connected in series between C6 and the BOOT pin, is mainly used to limit the voltage rise rate at the SW node, thereby suppressing EMI (electromagnetic interference). It is usually set to 0R (reserved position). The SW pin is directly connected to one end of the power inductor L1. L1 acts as the core energy storage element of the synchronous buck circuit: storing magnetic field energy and suppressing sudden current changes when the upper transistor is on, and releasing magnetic field energy to maintain the load current supply when the upper transistor is off and the lower transistor is on. The square wave signal output from pin SW, with its amplitude rapidly switching between VIN and GND, passes through L1 and forms a low-pass filter with the output filter capacitor group, including C7, C8, C9, C10, C11, and C15 (multiple 10uF-10V capacitors connected in parallel). This smooths the voltage ripple generated by the current pulses output from inductor L1, resulting in a clean and stable DC output voltage of +4V. The feedback loop control chip's pin FB (pin 7) continuously monitors the voltage Vfb at the midpoint (measuring point TP8) of the feedback voltage divider network composed of precision resistors R3, R4 (upper resistors -62kΩ, 4.7kΩ) and R5 (lower resistor -24.9kΩ), comparing it with its internal precise reference voltage to maintain a constant output voltage. The control chip then adjusts its internal high-frequency switching action to achieve a stable output current of + / -18-20mA (based on the annotation above, this is likely a current-limiting instruction for indicating LED operating status and not directly related to the constant voltage feedback setting).

[0037] In this embodiment, the optional implementation methods and variations are as follows: the specific connection method of the Schottky diode in the rectifier structure can be adjusted according to the input power level and thermal design requirements, as long as low-loss rectification can be achieved.

[0038] The number, capacity, and connection method of capacitors in the resonant capacitor network can be adjusted according to the receiving coil parameters and operating frequency.

[0039] The buck regulator module is not limited to using a specific type of Buck chip; other switching power supply structures capable of buck regulation can also be used. The number of LED driver branches can be adjusted according to the application scenario and is not limited to a fixed number.

[0040] The number of LEDs connected in each LED driver branch can be one or more, and the current limiting resistor parameters can also be adjusted according to the target current.

[0041] The specific number and location of test points can be adjusted according to the PCB layout design requirements, but it is preferable to reserve at least one test node inside each LED branch that can be used to detect the branch status.

[0042] The specific value of the output voltage can be set according to the forward voltage drop of the LED device, the target brightness, and the system power consumption requirements, and is not limited to a single fixed value.

[0043] The device selection scheme with a maximum thickness of no more than 1.1 mm can be further optimized according to product space constraints.

[0044] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A spatial signal acquisition terminal LED driving circuit and monitoring system, characterized in that, include: The system includes a space signal receiving and resonant module, a rectification and filtering module, a step-down and voltage regulation module, a multi-channel LED driver module, and a monitoring and testing module.

2. The space signal receiving and resonant module is used to receive energy transmitted from the space signal transmitter; it includes a receiving coil input terminal and a resonant capacitor network module connected to the receiving coil. The receiving coil and the resonant capacitor network module form a resonant circuit to improve the energy reception efficiency of space signals. The rectifier and filter module is connected after the space signal receiving and resonant module, and is used to convert the AC energy obtained by the receiving end into DC power and perform filtering. The step-down voltage regulator module is connected after the rectifier and filter module and is used to convert the rectified voltage into a stable output voltage suitable for LED driving. The multi-channel LED driver module is connected to the output terminal of the step-down voltage regulator module and includes multiple LED driver branches arranged in parallel. Each LED driver branch includes at least one LED device and a current-limiting resistor connected in series with the LED device. Each LED driver branch is connected in parallel between the output voltage bus and the reference ground so that each branch can work independently under the same power supply conditions. The monitoring and testing module is used to detect the working status of key circuit nodes and each LED driver branch; This includes test points set at multiple preset nodes, wherein the preset nodes include at least: rectifier output nodes, The output node of the buck regulator module, the reference ground node, the functional pin nodes of the buck regulator chip, and the branch detection nodes in each LED driver branch.

3. The LED driving circuit and monitoring system for a space signal acquisition terminal according to claim 1, characterized in that, The resonant capacitor network module uses a 1206 packaged resonant capacitor.

4. The LED driving circuit and monitoring system for a space signal acquisition terminal according to claim 1, characterized in that, The rectifier and filter module includes eight Schottky diodes, which together form a rectifier circuit.

5. The LED driving circuit and monitoring system for a space signal acquisition terminal according to claim 1, characterized in that, The buck regulator module adopts a buck structure, including a switch control chip, an inductor, an output filter capacitor, and a feedback voltage divider network; the output voltage is adjusted in a closed loop through the feedback voltage divider network to obtain the set drive bus voltage.

6. The LED driving circuit and monitoring system for a space signal acquisition terminal according to claim 4, characterized in that, The feedback voltage divider network employs resistive devices and a voltage regulation branch module. The resistive devices are used to improve the setting accuracy and stability of the output voltage; the voltage regulation branch module is used to adjust the output voltage according to the actual LED load requirements.

7. The LED driving circuit and monitoring system for a space signal acquisition terminal according to claim 1, characterized in that, Each of the aforementioned branch detection nodes is set at the connection node between the current-limiting resistor and the LED; by measuring at the connection node, the conduction status, voltage status and current operation of the corresponding branch can be determined, thereby facilitating branch consistency analysis and fault location.

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