LED control system

Abstract

The present disclosure provides an LED control system, belonging to the technical field of LED control. The LED control system comprises a rectification filtering module, a voltage conversion module, a constant voltage module, a constant current module and an LED module; the input end of the rectification filtering module is used for connecting commercial power, the output end of the rectification filtering module is connected with the input end of the voltage conversion module, the output end of the voltage conversion module is connected with the input end of the constant current module, and the output end of the constant current module is connected with the LED module; the input end of the constant voltage module is connected with the output end of the voltage conversion module, and the output end of the constant voltage module is connected with the input end of the voltage conversion module. The present disclosure can improve the working performance of the LED control system.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of LED control, and particularly relates to an LED control system. BACKGROUND

[0002] With the development of lighting technology, LED lighting is widely used due to the advantages of energy saving, environmental protection, long service life and the like. However, there are still many challenges in the field of LED control system. The voltage and current characteristics of the commercial power are unstable, which cannot directly meet the precise driving requirements of the LED module. The traditional control mode cannot effectively solve the problems of voltage adaptation, current stability and system stability, thereby leading to poor performance of the LED control system in the working process. CONTENT OF THE INVENTION

[0003] Embodiments of the present disclosure provide an LED control system to improve the working performance of the LED control system.

[0004] Embodiments of the present disclosure provide an LED control system, comprising a rectification and filtering module, a voltage conversion module, a constant voltage module, a constant current module and an LED module;

[0005] The input end of the rectification and filtering module is used to connect the commercial power, the output end of the rectification and filtering module is connected to the input end of the voltage conversion module, the output end of the voltage conversion module is connected to the input end of the constant current module, and the output end of the constant current module is connected to the LED module.

[0006] The input end of the constant voltage module is connected to the output end of the voltage conversion module, and the output end of the constant voltage module is connected to the input end of the voltage conversion module.

[0007] In an exemplary embodiment of the present disclosure, the rectification and filtering module comprises a rectification bridge U1, a capacitor C1, an inductor L1 and a capacitor C2.

[0008] The input end of the rectification bridge U1 is used to connect the commercial power, the first output end of the rectification bridge U1 is grounded, the second output end of the rectification bridge U1 is grounded through the capacitor C1, the second output end of the rectification bridge U1 is connected to the first end of the inductor L1, the second end of the inductor L1 is grounded through the capacitor C2, and the second end of the inductor L1 is connected to the input end of the voltage conversion module.

[0009] In an exemplary embodiment of the present disclosure, the voltage conversion module comprises a transformer T1, a diode D2 and a capacitor C4.

[0010] The first input end of the transformer T1 is connected to the output end of the rectification and filtering module, and the second input end of the transformer T1 is connected to the output end of the constant voltage module.

[0011] The first output end of the transformer T1 is connected to the anode of the diode D2, the cathode of the diode D2 is grounded through the capacitor C4, the cathode of the diode D2 is connected to the input end of the constant current module, and the second output end of the transformer T1 is grounded.

[0012] In an exemplary embodiment of the present disclosure, the constant voltage module comprises:

[0013] The resistor R2, the resistor R3, the diode D3, the voltage stabilizing tube D4, the driver U2, the resistor R4 and the triode Q1;

[0014] The first end of the resistor R2 is connected to the third output end of the transformer T1, the fourth output end of the transformer T1 is grounded, the second end of the resistor R2 is grounded through the resistor R3, the second end of the resistor R2 is connected to the feedback end of the driver U2, the second end of the resistor R2 is connected to the anode of the diode D3, the cathode of the diode D3 is connected to the power supply end of the driver U2, the cathode of the diode D3 is connected to the cathode of the voltage stabilizing tube D4, and the anode of the voltage stabilizing tube D4 is grounded.

[0015] The output end of the driver U2 is connected to the base of the triode Q1, the collector of the triode Q1 is connected to the second input end of the transformer T1, the emitter of the triode Q1 is grounded through the resistor R4, and the emitter of the triode Q1 is connected to the current detection end of the driver U2.

[0016] In an exemplary embodiment of the present disclosure, the constant current module comprises: a variable resistor RP1 and a triode Q2;

[0017] The first end of the variable resistor RP1 is connected to the output end of the voltage conversion module, the second end of the variable resistor RP2 is connected to the base of the triode Q2, the emitter of the triode Q2 is connected to the output end of the voltage conversion module, and the collector of the triode Q2 is connected to the LED module.

[0018] In an exemplary embodiment of the present disclosure, further comprising: a buffer module;

[0019] The buffer module is connected to the LED module.

[0020] In an exemplary embodiment of the present disclosure, the buffer module comprises: a diode D5, a capacitor C6 and a resistor R6;

[0021] The anode of the diode D5 is connected to the LED module, the cathode of the diode D5 is grounded through the capacitor C6, and the cathode of the diode D5 is grounded through the resistor R6.

[0022] The LED control system provided by the embodiments of the present disclosure has the following advantages: the rectification and filtering module can convert commercial power into relatively stable direct current, providing a suitable power supply basis for subsequent circuits and reducing AC ripple interference. The voltage conversion module can flexibly adjust the voltage to adapt to the voltage requirements of different specifications of LED modules, improving the versatility of the system. The constant current module precisely controls the current to ensure that the LED module operates under constant current, which greatly stabilizes the luminous intensity of the LED, prolongs the service life of the LED, and ensures the consistency of the lighting or display effect. The constant voltage module adjusts the input voltage of the voltage conversion module through feedback, enhancing the stability of the voltage of the entire system, so that the system can still operate reliably when the commercial power fluctuates or the load changes, and the performance, reliability and energy saving of the LED control system are comprehensively improved to meet the needs of various application scenarios. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative labor.

[0024] Figure 1 is a structural block diagram of the LED control system provided by the embodiments of the present disclosure;

[0025] Figure 2 is a circuit diagram of the LED control system provided by the embodiments of the present disclosure. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the present scheme, the technical solutions in the embodiments of the present scheme will be clearly described below in conjunction with the drawings in the embodiments of the present scheme. Obviously, the described embodiments are only a part of the embodiments of the present scheme, not all the embodiments. Based on the embodiments in the present scheme, all other embodiments obtained by those skilled in the art without creative labor should be within the scope of protection of the present scheme.

[0027] The term "comprise" and other any variants thereof in the specification and claims of the present scheme and the above-mentioned drawings means "comprise but not limited to", which is intended to cover non-exclusive inclusion and is not limited to the examples listed in the text. In addition, the terms "first" and "second" are used to distinguish different objects, not to describe a specific order.

[0028] The implementation of the present disclosure will be described in detail below in conjunction with the specific drawings:

[0029] Figure 1A structural schematic diagram of an LED control system is provided for the embodiments of the present disclosure. Refer to Figure 1 The LED control system comprises a rectification and filtering module, a voltage conversion module, a constant voltage module, a constant current module and an LED module. The input end of the rectification and filtering module is used for connecting the mains, the output end of the rectification and filtering module is connected to the input end of the voltage conversion module, the output end of the voltage conversion module is connected to the input end of the constant current module, and the output end of the constant current module is connected to the LED module. The input end of the constant voltage module is connected to the output end of the voltage conversion module, and the output end of the constant voltage module is connected to the input end of the voltage conversion module.

[0030] In the present embodiment, the LED module is powered by direct current, and an LED lamp can be used as the LED module. When the operation starts, the mains is connected to the rectification and filtering module. Since the mains is alternating current, the voltage and current will periodically change in size and direction with time, and cannot directly power the LED module. Therefore, the main function of the rectification and filtering module is to convert alternating current into direct current and filter the direct current.

[0031] The rectification process can be realized by a rectification bridge composed of diodes. For example, a bridge rectification circuit, when the alternating voltage of the mains is in the positive half cycle, a pair of diodes is turned on, and the current flows from one end of the alternating current source to the load through the turned-on diodes; when the alternating voltage is in the negative half cycle, the other pair of diodes is turned on, and the current can still flow to the load in the correct direction. Thus, the alternating current is converted into pulsating direct current. The filtering can be completed by elements such as capacitors and inductors, and a relatively stable direct current voltage output is obtained.

[0032] The voltage conversion module receives the direct current voltage from the rectification and filtering module. The voltage conversion module can boost or step down the input direct current voltage according to actual needs.

[0033] For example, in some LED lighting systems, if the voltage of the mains after rectification and filtering is higher than the driving voltage required by the LED module, the voltage conversion module can reduce the voltage to a suitable value. The voltage conversion module can adopt various topologies, such as a buck circuit, a boost circuit or a buck-boost circuit, etc.

[0034] The input end of the constant current module is connected to the output end of the voltage conversion module. The LED lamp is a current-type device, and its luminous intensity mainly depends on the current size passing through, rather than the voltage size. Therefore, the constant current module is needed to accurately control the current passing through the LED module. The constant current module can compare the detected current flowing through the LED module with the set reference current. If the detected current is greater than the reference current, the output voltage is adjusted or the equivalent resistance in the circuit is changed, etc., so that the current is reduced; on the contrary, if the detected current is less than the reference current, appropriate measures are taken to increase the current.

[0035] The constant voltage module is used to stabilize the input voltage of the voltage conversion module. When the output voltage of the voltage conversion module changes due to load variations or other factors (such as mains power fluctuations), the constant voltage module can detect this change. If the output voltage increases, the constant voltage module can take measures (such as adjusting the on-time of the internal switching transistor) to reduce the voltage input to the voltage conversion module, thereby indirectly stabilizing the output voltage of the voltage conversion module. Conversely, if the output voltage decreases, the constant voltage module can take the opposite measure to increase the voltage input to the voltage conversion module. The constant voltage module forms a feedback loop, which contributes to the voltage stability of the entire system, ensuring that the system voltage remains within a reasonable range under various operating conditions. This allows the constant current module to operate better, providing stable driving conditions for the LED module.

[0036] As can be seen from the above, the rectifier and filter module in this embodiment can convert mains power into relatively stable DC power, providing a suitable power foundation for subsequent circuits and reducing AC ripple interference. The voltage conversion module can flexibly adjust the voltage to adapt to the voltage requirements of LED modules of different specifications, improving system versatility. The constant current module precisely controls the current, ensuring that the LED module operates under a constant current, which greatly stabilizes the LED's brightness, extends its lifespan, and ensures consistency in lighting or display effects. The constant voltage module, through feedback adjustment of the input voltage of the voltage conversion module, enhances the stability of the entire system voltage, enabling it to operate reliably even when mains power fluctuates or load changes. This comprehensively improves the performance, reliability, and energy efficiency of the LED control system, meeting the needs of various application scenarios.

[0037] like Figure 2 As shown, in one embodiment of this disclosure, the rectifier filter module includes: a rectifier bridge U1, a capacitor C1, an inductor L1, and a capacitor C2; the input terminal of the rectifier bridge U1 is connected to the mains power, the first output terminal of the rectifier bridge U1 is grounded, the second output terminal of the rectifier bridge U1 is grounded through the capacitor C1, the second output terminal of the rectifier bridge U1 is connected to the first terminal of the inductor L1, the second terminal of the inductor L1 is grounded through the capacitor C2, and the second terminal of the inductor L1 is connected to the input terminal of the voltage conversion module.

[0038] In this embodiment, when the mains power is connected to the rectifier bridge U1, the rectifier bridge U1 uses the unidirectional conductivity of its internal diodes to convert the alternating current into pulsating direct current. During the positive half-cycle, the current flows to the load side (i.e., the direction of inductor L1) through a specific diode path; during the negative half-cycle, the current is rectified through another set of diode paths, thereby obtaining a unidirectional pulsating DC output.

[0039] Capacitor C1 acts as a preliminary filter, charging at the peak of the pulsating DC voltage and discharging when the voltage drops, thus smoothing the voltage waveform to some extent. Inductor L1, utilizing the principle of self-inductance, impedes changes in current, further reducing current fluctuations and making the current smoother. Capacitor C2 further filters the voltage after passing through inductor L1, further reducing voltage ripple. This converts the mains power into a relatively stable DC voltage output to the voltage conversion module, providing a stable DC power supply foundation for subsequent circuits and ensuring the stable and efficient operation of the entire LED control system.

[0040] like Figure 2 As shown, in one embodiment of this disclosure, the voltage conversion module includes: a transformer T1, a diode D2, and a capacitor C4; the first input terminal of the transformer T1 is connected to the output terminal of the rectifier filter module, and the second input terminal of the transformer T1 is connected to the output terminal of the constant voltage module; the first output terminal of the transformer T1 is connected to the anode of the diode D2, the cathode of the diode D2 is grounded through the capacitor C4, the cathode of the diode D2 is connected to the input terminal of the constant current module, and the second output terminal of the transformer T1 is grounded.

[0041] In this embodiment, the first input terminal of the transformer T1 of the voltage conversion module receives a relatively stable DC input voltage from the rectifier and filter module. Simultaneously, the second input terminal of the transformer T1 is connected to the output terminal of the constant voltage module, indicating that the output of the constant voltage module can affect the operating state of the transformer T1.

[0042] Diode D2 acts as a rectifier. When the induced voltage causes the anode potential of diode D2 to be higher than the cathode potential, diode D2 conducts, and current flows through diode D2 to charge capacitor C4. When the anode potential is lower than the cathode potential, diode D2 is cut off, and capacitor C4 can discharge through the current module, thereby converting the AC voltage induced in the secondary winding of transformer T1 into DC voltage. The voltage rectified by diode D2 is filtered by capacitor C4. Capacitor C4 can store charge, charging when the voltage rises and discharging when the voltage falls, smoothing the voltage waveform, thus obtaining a relatively stable DC output voltage at the cathode of diode D2.

[0043] like Figure 2As shown, in an embodiment of the present disclosure, the constant voltage module comprises: a resistor R2, a resistor R3, a diode D3, a voltage stabilizing tube D4, a driver U2, a resistor R4 and a triode Q1; a first end of the resistor R2 is connected to a third output end of a transformer T1, a fourth output end of the transformer T1 is grounded, a second end of the resistor R2 is grounded through the resistor R3, the second end of the resistor R2 is connected to a feedback end of the driver U2, the second end of the resistor R2 is connected to an anode of the diode D3, a cathode of the diode D3 is connected to a power supply end of the driver U2, the cathode of the diode D3 is connected to a cathode of the voltage stabilizing tube D4, an anode of the voltage stabilizing tube D4 is grounded; an output end of the driver U2 is connected to a base of the triode Q1, a collector of the triode Q1 is connected to a second input end of the transformer T1, an emitter of the triode Q1 is grounded through the resistor R4, and the emitter of the triode Q1 is connected to a current detection end of the driver U2.

[0044] In the embodiment, a feedback coil composed of the third output end and the fourth output end of the transformer T1 generates an induced voltage when the voltage conversion module is working. The induced voltage is divided by the resistor R2 and the resistor R3, and the voltage on the resistor R3 is taken as a sampling voltage and added to the feedback end (FB pin) of the driver U2. Through such a voltage dividing operation, the voltage of the feedback coil can be converted by a certain ratio to provide a suitable reference signal for subsequent voltage regulation. At the same time, the voltage on the resistor R3 is added to the power supply end (VCC pin) of the driver U2 through the diode D3, thereby providing operating voltage for the driver U2. Here, the diode D3 functions as a unidirectional conduction device to ensure that the current flows into the driver U2 in the correct direction, and the anode of the voltage stabilizing tube D4 is grounded to utilize its voltage stabilizing property to ensure that the driver U2 can work under stable voltage and avoid the influence of power supply voltage fluctuation on its normal operation.

[0045] In the embodiment, the driver U2 can output PWM (pulse width modulation) control signals with different duty cycles according to the sampling voltage received by the feedback end (FB pin), and add the signals to the base of the triode Q1. Different duty cycles mean that the proportion of time occupied by high level and low level in a period is different. When the PWM control signal is at high level, the triode Q1 is turned on. At this time, a voltage signal is generated between the first input end and the second input end (constituting a primary coil) of the transformer T1, and the electric energy establishes a magnetic field through the primary coil to prepare for the generation of an induced voltage on the secondary coil (output coil). When the PWM control signal is at low level, the triode Q1 is turned off, and the voltage on the primary coil of the transformer T1 disappears, and the magnetic field changes accordingly. This periodic on-off change cooperates with the electromagnetic induction principle of the transformer to realize the conversion and regulation of voltage.

[0046] When the voltage on the output coil of transformer T1 (comprising the first and second output terminals) fluctuates, the voltage on the feedback coil will also fluctuate due to the electromagnetic coupling between the coils of transformer T1. Driver U2 can monitor this voltage change on the feedback coil in real time and adjust the duty cycle of the output PWM control signal accordingly. For example, if the output voltage increases, driver U2 can adjust the PWM signal duty cycle to shorten the conduction time of transistor Q1, reducing the energy input to the primary coil and thus regulating the voltage on the output coil of transformer T1. Conversely, if the output voltage decreases, the conduction time of transistor Q1 is increased to increase the energy input, thereby ensuring that the output voltage of transformer T1 remains stable, forming an effective closed-loop feedback regulation system to maintain the stability of the entire circuit voltage.

[0047] The current sensing terminal (CS pin) of driver U2 can acquire the voltage across resistor R4. Since resistor R4 is connected in series in the emitter circuit of transistor Q1, the voltage across resistor R4 is proportional to the operating current flowing through transistor Q1. Therefore, driver U2 can accurately determine the magnitude of the operating current flowing through transistor Q1 based on the voltage across resistor R4. When the operating current of transistor Q1 exceeds the set value, driver U2 stops outputting the PWM control signal, causing transistor Q1 to turn off. This prevents transistor Q1 from overheating and burning out due to excessive current, providing effective protection and ensuring the safe and stable operation of the entire constant voltage module and its connected circuits.

[0048] like Figure 2 As shown, in one embodiment of this disclosure, the constant current module includes: a variable resistor RP1 and a transistor Q2; the first end of the variable resistor RP1 is connected to the output end of the voltage conversion module, the second end of the variable resistor RP2 is connected to the base of the transistor Q2, the emitter of the transistor Q2 is connected to the output end of the voltage conversion module, and the collector of the transistor Q2 is connected to the LED module.

[0049] In this embodiment, a PNP transistor can be used as transistor Q2. In this embodiment, transistor Q2 operates in the amplification state.

[0050] The emitter of transistor Q2 is connected to the output of the voltage conversion module, which makes the potential of the emitter of transistor Q2 related to the input voltage (from the voltage conversion module). When transistor Q2 is turned on, current flows from the emitter to the collector and finally to the LED module.

[0051] The voltage between the base and emitter of transistor Q2 is related to the current flowing through the LED module and is regulated by the variable resistor RP1. When the current through the LED module increases, a corresponding voltage change occurs between RP1 and the base-emitter of transistor Q2, reducing the conduction level of transistor Q2 and thus limiting further current increases. Conversely, when the current through the LED module decreases, the conduction level of transistor Q2 increases, causing the current to increase. This achieves stable current control of the LED module, avoiding unstable luminous intensity or LED module damage caused by current fluctuations, thereby extending the lifespan of the LED module and ensuring stable lighting or display effects.

[0052] In one embodiment of this disclosure, it further includes: a buffer module; and an LED module for connecting the buffer module.

[0053] In this embodiment, during the operation of the LED module, instantaneous high-voltage or high-current pulses may be generated due to circuit switching, sudden current changes, or other electrical interference factors. The buffer module is connected to the LED module primarily to protect it from damage caused by these transient pulses. When instantaneous voltage spikes occur, the buffer module can absorb or dissipate this excess energy.

[0054] For example, suppose the buffer module is an RC buffer circuit composed of a capacitor and a resistor. The capacitor can charge when the voltage spikes instantaneously, storing the excess energy as electric field energy. At the same time, the resistor limits the charging current, preventing the capacitor from charging too quickly and being damaged. After the voltage spike passes, the capacitor slowly discharges, releasing the stored energy back into the circuit, making the voltage change across the LED module relatively gradual and preventing the LED module from being damaged by excessively high voltage.

[0055] like Figure 2 As shown, in one embodiment of this disclosure, the buffer module includes: diode D5, capacitor C6 and resistor R6; the anode of diode D5 is connected to the LED module, the cathode of diode D5 is grounded through capacitor C6, and the cathode of diode D5 is grounded through resistor R6.

[0056] In this embodiment, diode D5, capacitor C6, and resistor R6 constitute a buffer circuit. The function of diode D5 is to prevent reverse voltage from damaging the LED module. An LED is a unidirectional conducting device; when a reverse voltage occurs in the circuit, diode D5 provides a path for the reverse current, allowing it to bypass the LED module and preventing reverse breakdown. For example, diode D5 can provide protection during the instant the circuit is powered off or when a reverse electromotive force is generated by external electromagnetic interference.

[0057] The capacitor C6 can play a role of filtering and energy storage. In a normal working state, the capacitor C6 can filter high-frequency noise in the circuit. When a voltage spike occurs in the circuit, the capacitor C6 can absorb part of the energy and store the electrical energy in the form of an electric field. Since the voltage across the capacitor cannot change abruptly, it can smooth the voltage fluctuations, making the voltage across the LED module more stable. For example, when the power supply voltage suddenly rises, the capacitor C6 charges, thereby slowing down the impact of the voltage rise on the LED module.

[0058] The resistor R6 is mainly used to limit the current. When the capacitor C6 charges or discharges, the resistor R6 can control the size of the current to avoid excessive current during the charging or discharging of the capacitor C6.

[0059] The above examples are only used to illustrate the technical solutions of the present disclosure, but not to limit it; although the foregoing disclosure has been described in detail with reference to the foregoing examples, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacements for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. An LED control system, characterized in that, include: Rectifier and filter module, voltage conversion module, constant voltage module, constant current module, and LED module; The input terminal of the rectifier and filter module is connected to the mains power, the output terminal of the rectifier and filter module is connected to the input terminal of the voltage conversion module, the output terminal of the voltage conversion module is connected to the input terminal of the constant current module, and the output terminal of the constant current module is connected to the LED module. The input terminal of the constant voltage module is connected to the output terminal of the voltage conversion module, and the output terminal of the constant voltage module is connected to the input terminal of the voltage conversion module.

2. The LED control system as described in claim 1, characterized in that, The rectifier and filter module includes: a rectifier bridge U1, a capacitor C1, an inductor L1, and a capacitor C2; The input terminal of the rectifier bridge U1 is used to connect to the mains power. The first output terminal of the rectifier bridge U1 is grounded. The second output terminal of the rectifier bridge U1 is grounded through the capacitor C1. The second output terminal of the rectifier bridge U1 is connected to the first terminal of the inductor L1. The second terminal of the inductor L1 is grounded through the capacitor C2. The second terminal of the inductor L1 is connected to the input terminal of the voltage conversion module.

3. The LED control system as described in claim 1, characterized in that, The voltage conversion module includes: transformer T1, diode D2, and capacitor C4; The first input terminal of the transformer T1 is connected to the output terminal of the rectifier and filter module, and the second input terminal of the transformer T1 is connected to the output terminal of the constant voltage module. The first output terminal of the transformer T1 is connected to the anode of the diode D2, the cathode of the diode D2 is grounded through the capacitor C4, the cathode of the diode D2 is connected to the input terminal of the constant current module, and the second output terminal of the transformer T1 is grounded.

4. The LED control system as described in claim 3, characterized in that, The constant pressure module includes: Resistor R2, resistor R3, diode D3, Zener diode D4, driver U2, resistor R4, and transistor Q1; The first end of resistor R2 is connected to the third output terminal of transformer T1, the fourth output terminal of transformer T1 is grounded, the second end of resistor R2 is grounded through resistor R3, the second end of resistor R2 is connected to the feedback terminal of driver U2, the second end of resistor R2 is connected to the anode of diode D3, the cathode of diode D3 is connected to the power supply terminal of driver U2, the cathode of diode D3 is connected to the cathode of Zener diode D4, and the anode of Zener diode D4 is grounded. The output terminal of the driver U2 is connected to the base of the transistor Q1, the collector of the transistor Q1 is connected to the second input terminal of the transformer T1, the emitter of the transistor Q1 is grounded through the resistor R4, and the emitter of the transistor Q1 is connected to the current detection terminal of the driver U2.

5. The LED control system as described in claim 1, characterized in that, The constant current module includes: a variable resistor RP1 and a transistor Q2; The first end of the variable resistor RP1 is connected to the output end of the voltage conversion module, the second end of the variable resistor RP2 is connected to the base of the transistor Q2, the emitter of the transistor Q2 is connected to the output end of the voltage conversion module, and the collector of the transistor Q2 is connected to the LED module.

6. The LED control system as described in claim 1, characterized in that, Also includes: Buffer module; The buffer module is connected to the LED module.

7. The LED control system as described in claim 6, characterized in that, The buffer module includes: diode D5, capacitor C6 and resistor R6; The anode of diode D5 is connected to the LED module, the cathode of diode D5 is grounded through capacitor C6, and the cathode of diode D5 is grounded through resistor R6.

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