High-voltage linear constant-power stroboflash-removing LED drive circuit and lamp

Abstract

The utility model discloses a high-voltage linear constant-power stroboflash-removing LED drive circuit, which comprises a capacitive path, a voltage dividing module, a first output module, a second output module, a sampling control module, a first output resistor and a second output resistor, and is characterized in that the capacitive path converts commercial power into direct-current voltage; when the direct-current voltage is larger than the voltage required by the load, the first output module and the second output module are conducted at the same time, and when the direct-current voltage is smaller than the voltage required by the load, the first output module is conducted and the second output module is closed; the voltage dividing module generates a sampling signal according to the direct-current voltage, the sampling control module generates a constant-power control signal according to the sampling signal, and the first output module controls the current input to the load according to the constant-power control signal. Therefore, the stroboscopic problem is solved by adopting the design of the low-voltage reference of the main path and the high-voltage reference of the auxiliary path in the operation process by adjusting the current of the main path and supplementing the auxiliary path; and meanwhile, the constant power requirement of the LED load can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of LED drive circuits, in particular to a high-voltage linear constant-power stroboscopic-removing LED drive circuit and a lamp. Background Art

[0002] LED lighting appliances have been widely used in various places due to their advantages of energy conservation and environmental protection. In use, LED lighting appliances usually use commercial power. To ensure the stability of the light during use and the stability of the chip operation, an LED drive circuit is required between the commercial power and the LED load to convert alternating current into direct current and ensure that the current flowing through the LED load is constant, so as to ensure the constant brightness of the LED lighting. However, during the LED drive control process, the low-frequency ripple contained in the input AC mains is often introduced into the DC output. The low-frequency ripple generates power-frequency flicker that can be perceived by the human eye on the LED lighting device, bringing a bad experience to users.

[0003] Based on this, an LED drive circuit is needed to ensure that power frequency flicker can be removed while providing constant power. Summary of the Utility Model

[0004] The main purpose of the utility model is to provide a high-voltage linear constant-power stroboscopic-removing LED drive circuit.

[0005] To achieve the above purpose, the utility model provides a high-voltage linear constant-power stroboscopic-removing LED drive circuit, which is connected to an LED load and includes a capacitive path, a voltage dividing module, a first output module, a second output module, a sampling control module, a first output resistor R3, and a second output resistor R4. Among them,

[0006] The input end of the capacitive path is connected to the mains, and is used for converting the mains into a DC voltage;

[0007] The input end of the first output module is connected to the first output end of the capacitive path, the input end of the second output module is connected to the second output end of the capacitive path, the output end of the first output module is connected to the LED load via the first output resistor R3, and the output end of the second output module is connected to the LED load via the second output resistor R4 and the first output resistor R3. When the DC voltage is greater than the voltage required by the LED load, the first output module and the second output module are both turned on. When the DC voltage is less than the voltage required by the LED load, the first output module is turned on and the second output module is turned off;

[0008] The input end of the voltage dividing module is connected to the second output end of the capacitive path, and the first output end of the voltage dividing module is connected to the LED load, and is used for generating a sampling signal according to the DC voltage;

[0009] The input end of the sampling control module is connected to the second output end of the voltage dividing module, and is used to generate a constant power control signal according to the sampling signal;

[0010] The control of the first output module is connected to the output end of the sampling control module, and controls the current input to the LED load according to the constant power control signal.

[0011] According to another aspect of the present invention, there is also provided an LED lamp including the high-voltage linear constant-power stroboscopic-removing LED driving circuit as described above.

[0012] The high-voltage linear constant-power stroboscopic-removing LED driving circuit provided by the present invention has the following beneficial effects: The high-voltage linear constant-power stroboscopic-removing LED driving circuit provided by the present invention includes a capacitive path, a voltage dividing module, a first output module, a second output module, a sampling control module, a first output resistor R3 and a second output resistor R4. The capacitive path converts the mains power into a DC voltage; when the DC voltage is greater than the voltage required by the LED load, the first output module and the second output module are both turned on, and when the DC voltage is less than the voltage required by the LED load, the first output module is turned on and the second output module is turned off; the voltage dividing module generates a sampling signal according to the DC voltage, the sampling control module generates a constant power control signal according to the sampling signal, and the first output module controls the current input to the LED load according to the constant power control signal; thus, by adopting the design of a low-voltage reference for the main path and a high-voltage reference for the auxiliary path, the stroboscopic problem is solved by adjusting the main path current and supplementing the auxiliary path during operation; at the same time, through the technology of sampling the peak voltage of the wire network, the corresponding constant power starting point is designed internally, and the constant power range is set externally through a resistor to meet the constant power requirement of the LED load. Description of the Drawings

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings:

[0014] Figure 1 The schematic diagram of the high-voltage linear constant-power stroboscopic-removing LED driving circuit provided by an embodiment of the present invention is shown;

[0015] Figure 2 Shown as Figure 1 The circuit diagram of the first output module shown;

[0016] Figure 3 Shown asFigure 1 The circuit diagram of the second output module shown;

[0017] Figure 4 As shown; Figure 1 The circuit diagram of the sampling control module shown;

[0018] Figure 5 As shown; Figure 4 The circuit diagram of the clock module shown;

[0019] Figure 6 As shown; Figure 4 The circuit diagram of the constant power control module shown;

[0020] Figure 7 The waveform diagram showing the output current varying with the line network voltage;

[0021] Figure 8 The logic waveform diagram of the peak sampling circuit shown;

[0022] Figure 9 It is the waveform diagram of the input power and the LED power varying with Vac. Specific embodiments

[0023] For ease of understanding the present utility model, the present utility model will be described more comprehensively below with reference to the relevant drawings. The typical embodiments of the present utility model are given in the drawings. However, the present utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present utility model more thorough and comprehensive.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present utility model belongs. The terms used in the specification of the present utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model.

[0025] Figure 1 Shown is the schematic diagram of the high-voltage linear constant power stroboscopic-free LED driving circuit provided by an embodiment of the present utility model. As Figure 1As shown, the high-voltage linear constant-power stroboscopic-free LED drive circuit provided by the present utility model includes a capacitive path composed of a rectifier bridge group Z1, a diode D0, and an input capacitor C0, a voltage-dividing module composed of a first voltage-dividing resistor R1 and a second voltage-dividing resistor R2, a first output module 20, a second output module 30, a sampling control module 10, a first output resistor R3, and a second output resistor R4. The input end OUT1 of the first output module 20 is connected to the first output end of the capacitive path, the input end OUT2 of the second output module 30 is connected to the second output end of the capacitive path, the output end of the first output module 20 is connected to the LED load via the first output resistor R3, and the output end of the second output module 30 is connected to the LED load via the second output resistor R4 and the first output resistor R3. When the DC voltage is greater than the voltage required by the LED load, the first output module and the second output module are simultaneously turned on. When the DC voltage is less than the voltage required by the LED load, the first output module is turned on and the second output module is turned off; the input end of the voltage-dividing module is connected to the second output end of the capacitive path, and the first output end of the voltage-dividing module is connected to the LED load for generating a sampling signal according to the DC voltage; the input end of the sampling control module is connected to the second output end of the voltage-dividing module for generating a constant-power control signal according to the sampling signal; the control of the first output module is connected to the output end of the sampling control module for controlling the current input to the LED load according to the constant-power control signal.

[0026] Specifically, in an embodiment of the present utility model, within each half-cycle of the mains voltage, when the line network voltage is lower than the LED lamp voltage, the auxiliary channel where the second output module is located is turned off. At this time, only the main channel where the first output module is located provides the current flowing through the LED load. Among them, the magnitude of the current value is jointly determined by the voltage of the REXT1 port of the first output module and the first output resistor R3. When the line network voltage gradually increases and is greater than the LED lamp voltage, the auxiliary channel where the second output module is located is turned on at this time. Among them, the magnitude of the current flowing through the second output module is (the voltage of the REXT2 port minus the voltage of the REXT1 port) divided by the second output resistor R4. At this time, the magnitude of the current value flowing through the first output module is (the voltage of the REXT1 port divided by the first output resistor R3) minus the current of the second output module. Thus, within each half-cycle of the mains voltage, two different working states can be established, that is, when the line network voltage is greater than the lamp voltage, the first output module and the second output module are simultaneously turned on; when the line network voltage is less than the lamp voltage, the auxiliary path where the second output module is located is turned off, and at the same time, the capacitive path provides the voltage for maintaining the current to the main path where the first output module is located.

[0027] Specifically, in an embodiment of the present utility model, as Figure 1As shown, the input end of the capacitive path is connected to the mains power supply, which is used to convert the mains power supply into a DC voltage. Among them, the output end of the rectifier bridge group Z1 is connected to the input end of the voltage dividing module, the positive pole of the diode D0, and the input end OUT2 of the second output module. The negative pole of the diode D0 is connected to the first end of the input capacitor C0 and the input end OUT1 of the first output module. The second end of the input capacitor C0 is grounded. In each mains cycle, after the sinusoidal mains power supply passes through the rectifier bridge Z1, it is shaped into a DC half-wave with a mantou-shaped periodic waveform. The mains power supply is output at the output port of the rectifier bridge Z1 after rectification. Among them, one path of the output voltage is coupled to the OUT1 port of the first output module through the diode D0 and the input capacitor C0, and the other path is directly coupled to the OUT2 port of the second output module. As Figure 7 shown, when the line network voltage is lower than the lamp voltage, the first output module is powered by the input capacitor C0, and the conduction current I OUT1 is in a large current state; when the line network voltage is higher than the lamp voltage, the rectifier bridge Z1 charges the input capacitor C0, and the conduction current I OUT1 of the first output module is in a small current state, and the two states are periodically adjusted as the line network voltage changes. Further, as Figure 1 shown, the second output module is directly powered by the rectifier bridge Z1. Therefore, as Figure 7 shown, only when the line network voltage is greater than the lamp voltage, the conduction current I OUT2 of the second output module is not 0. When the line network voltage is less than the lamp voltage, the conduction current I OUT2 of the second output module drops to 0. The current I led flowing through the LED load is the sum of the conduction current I OUT of the first output module and the conduction current I OUT2 of the second output module, and remains unchanged throughout the cycle of the line network voltage change.

[0028] Specifically, in an embodiment of the present invention, as Figure 1 shown, the voltage dividing module includes a first voltage dividing resistor R1 and a second voltage dividing resistor R2. The first end of the first voltage dividing resistor R1 is connected to the output end of the rectifier bridge group Z1. The second end of the first voltage dividing resistor R1 is connected to the first end of the second voltage dividing resistor R2 and the input end of the sampling control module 10. The second end of the second voltage dividing resistor R2 is connected to the LED load. The first voltage dividing resistor R1 and the second voltage dividing resistor R2 sample the line network voltage formed after the rectification of the rectifier bridge group Z1 according to a certain ratio and input the sampling signal VT into the sampling control module.

[0029] Figure 2 Shown is Figure 1 the circuit diagram of the first output module shown as Figure 2As shown in the figure, the first output module 20 includes a first operational amplifier AMP1, a first output transistor M1, and a first constant-power regulating resistor R5. The non-inverting input terminal of the first operational amplifier AMP1 is connected to a first reference signal VREF1. The inverting input terminal of the first operational amplifier AMP1 is connected to the output terminal of the sampling control module and the first terminal of the first constant-power regulating resistor R5. The output terminal of the first operational amplifier AMP1 is connected to the base of the first output transistor M1. The collector of the first output transistor M1 is the input terminal OUT1 of the first output module. The emitter of the first output transistor M1 is connected to the second terminal of the first constant-power regulating resistor R5 and serves as the output terminal REXT1 of the first output module. Among them, a suitable port voltage is set for the output port REXT1 through the first reference signal VREF1. A constant-power control signal IVT is provided by the sampling control module. The constant-power control signal generates a corresponding voltage drop across the first constant-power regulating resistor R5 according to the magnitude of the line network peak voltage, thereby reducing the port voltage of REXT1.

[0030] Figure 3 As shown in Figure 1 the circuit diagram of the second output module shown in the figure; the second output module 30 includes a second operational amplifier AMP2, a second output transistor M2, and a second constant-power regulating resistor R6. The non-inverting input terminal of the second operational amplifier AMP2 is connected to a second reference signal VREF2. The inverting input terminal of the second operational amplifier AMP2 is connected to the first terminal of the second constant-power regulating resistor R6. The output terminal of the second operational amplifier AMP2 is connected to the base of the second output transistor M2. The collector of the second output transistor M2 is the input terminal OUT2 of the second output module. The emitter of the second output transistor M2 is connected to the second terminal of the second constant-power regulating resistor R6 and serves as the output terminal REXT2 of the second output module. Among them, a suitable port voltage is set for the output port REXT2 through the second reference signal VREF2.

[0031] Figure 4 As shown in Figure 1 the circuit diagram of the sampling control module shown in the figure. As Figure 4As shown, the sampling control module 10 includes an RC filter circuit, a peak sampling circuit, a clock module 120, and a constant power control module 110. Among them, the input end of the RC filter circuit and the input end of the clock module are connected to the second output end of the voltage division module. The output end of the RC filter circuit and the output end of the clock module are connected to the input end of the peak sampling circuit. The output end of the peak sampling circuit is connected to the input end of the constant power control module. The output end of the constant power control module is connected to the control end of the first output module. Specifically, the sampling signal from the voltage division module is filtered by the RC filter circuit and then input to the peak sampling circuit. The peak sampling circuit processes the sampling signal under the control of the clock module and inputs the generated constant power sampling signal to the constant power control module. The constant power control module generates a constant power control signal according to the constant power sampling signal and outputs it to the first output module.

[0032] In this embodiment, the line network voltage is divided by a certain ratio through the first voltage division resistor R1 and the second voltage division resistor R2 and then input to the RC filter circuit of the sampling control module for filtering. After being filtered by the RC filter circuit, it enters the peak sampling circuit. The peak sampling circuit processes the sampling signal of the line network voltage and sends a constant power sampling signal to the constant power control module. The constant power generation circuit injects a certain amount of current into the first output module according to the constant power sampling signal output by the peak sampling circuit. The magnitude of the current is automatically adjusted according to the line network voltage. Thus, the real-time peak voltage of the line network voltage can be sampled and saved through the sampling control module, and then after being processed by the constant power control module, it acts on the output circuit, thereby realizing the dynamic adjustment of the output signal in real time according to the change of the line network voltage.

[0033] Furthermore, in an embodiment of the present utility model, as Figure 4As shown, the peak sampling circuit includes a third operational amplifier AMP3, a first mirror transistor N1, a second mirror transistor N2, and a third mirror transistor N3, a first capacitor C1, a second capacitor C2, a first switch CLK, and a second switch CKB_delay. The positive input terminal of the third operational amplifier AMP3 is connected to the output terminal of the RC filter circuit. The output terminal of the third operational amplifier AMP3 is connected to the base of the first mirror transistor N1. The collector of the first mirror transistor N1 is connected to the collector of the second mirror transistor N2. The base of the second mirror transistor N2 is connected to the base of the third mirror transistor N3. The negative input terminal of the third operational amplifier AMP3 is connected to the first terminal of the second switch CKB_delay, the collector of the third mirror transistor N3, the first terminal of the first capacitor C1, and the first terminal of the first switch CLK. The emitter of the first mirror transistor N1 is grounded. The emitters of the third mirror transistor N3 and the second mirror transistor N2 are externally connected to a voltage. The first terminal of the first switch CLK is connected to the first terminal of the second capacitor C2 and the input terminal of the constant power control module. The second terminal of the second switch CKB_delay, the second terminal of the first capacitor C1, and the second terminal of the second capacitor C2 are grounded. The clock module controls the turning off of the first switch CLK and the second switch CKB_delay.

[0034] In this embodiment, the line network voltage is divided by the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 and enters the sampling control module. After being filtered by the RC filter circuit, it is processed by the pre-stage circuit composed of the third operational amplifier AMP3 and the mirror transistors M1, M2, and M3, and a periodically changing voltage signal is generated on the first C1 capacitor (as Figure 8 shown). The first switch CLK controlled by the clock signal CLK is turned on once within each half-wave of the commercial power. The turn-on width is approximately 1e-7S. This process connects the first C1 capacitor and the second C2 capacitor, and the charge will flow from the high-potential side to the low-potential side. After the first switch CLK is turned off and after approximately 2e-8S, the voltage on the first C1 capacitor is discharged and reset by the second switch CKB_delay controlled by the CKB_delay signal (as Figure 8 shown).

[0035] Figure 5 As shown in Figure 4 is the circuit diagram of the clock module shown in Figure 5As shown in the figure, the clock module 120 includes a comparator COMP, an inverter INV1, a third switch Vsin_L, a fourth switch Vsin_H, and a clock signal generation unit 1201. The first terminal of the third switch Vsin_L is connected to the first reference voltage VREF_H, and the first terminal of the fourth switch Vsin_H is connected to the second reference voltage VREF_L. The second terminals of the third switch and the fourth switch are connected to the positive input terminal of the comparator COMP. The negative input terminal of the comparator COMP is connected to the sampling signal VT. The output terminal of the comparator COMP is connected to the input terminal of the clock signal generation unit via the inverter INV1. The first output terminal of the clock signal generation unit is connected to the first switch CLK, and the second output terminal of the clock signal generation unit is connected to the second switch CKB_delay. The VT signal is obtained by dividing the line network voltage by the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2. The comparator COMP detects the VT signal and generates a periodic signal following the mains cycle. Thus, the clock module 120 can provide a clock signal following the mains cycle for the sampling control module.

[0036] Figure 6 As shown Figure 4 The circuit diagram of the constant power control module shown in the figure. As Figure 6 As shown in the figure, the constant power control module includes a fourth operational amplifier AMP4, a driving transistor P1, a seventh resistor R7, a fourth mirror transistor P2, a fifth mirror transistor P3, and a constant current source. The positive input terminal of the fourth operational amplifier AMP4 is connected to the first terminal of the first switch CLK. The negative input terminal of the fourth operational amplifier AMP4 is connected to the first terminal of the seventh resistor R7 and the emitter of the driving transistor P1. The output terminal of the fourth operational amplifier AMP4 is connected to the base of the driving transistor P1. The collector of the driving transistor P1 is connected to the constant current source and the collector of the fourth mirror transistor P2. The base of the fourth mirror transistor P2 is connected to the base of the fifth mirror transistor P3. The collector of the fifth mirror transistor P3 is connected to the control terminal of the first output module. The emitters of the fourth mirror transistor P2 and the fifth mirror transistor P3 are externally connected to a voltage.

[0037] In this embodiment, the peak sampling circuit outputs the constant power sampling signal sample to the constant power control module 110 and generates a corresponding current on the resistor R7. After subtracting this current from the constant current in the current source, it is output to control IVT to the first output module 20 in a certain proportion through the mirror transistors composed of P2 and P3.

[0038] As Figure 6As shown, the current in the current source is the designed constant value. When the sample signal is at the voltage of the set constant power starting point (for example, 1.2V), all the current in the current source flows through the R7 resistor. When the sample signal is at a voltage less than the set constant power starting point (for example, 1.2V), the current in the current source is greater than the current flowing through R7, and the IVT current is 0. When the sample signal is at a voltage greater than the set constant power starting point (for example, 1.2V), the current in the current source is less than the current flowing through R7, and P3 outputs a constant power control signal IVT to the first output module 20.

[0039] Further, the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 are used to set the corresponding power grid voltage-dividing ratio to configure the constant power working range of the constant power control module. As Figure 9 shown, when the line network voltage reaches the configured constant power protection point (for example, it can be set to 1.2V), the constant power function is started, and at this time, the LED power begins to linearly decrease with the line network voltage. At the same time, the circuit input power changes from linear increase to being constant with the line network voltage.

[0040] The high-voltage linear constant power stroboscopic elimination LED driver circuit provided by the present utility model adopts two current paths of a main path and an auxiliary path, and the REXT port reference of the main path and the auxiliary path adopts the design of a low voltage reference for the main path and a high voltage reference for the auxiliary path. During operation, the stroboscopic problem is solved by adjusting the main path current and supplementing the auxiliary path. At the same time, through the technology of sampling the peak voltage of the line network, the corresponding constant power starting point is designed internally, and the constant power range is set externally through resistors to meet the constant power requirements of the LED load.

[0041] In the specification provided here, a large number of specific details are described. However, it can be understood that the embodiments of the present utility model can be practiced without these specific details. In some instances, well-known methods, structures, and technologies are not shown in detail so as not to obscure the understanding of this specification.

[0042] Similarly, it should be understood that, in order to streamline this disclosure and help understand one or more of the various aspects of the utility model, in the above description of the exemplary embodiments of the utility model, the various features of the utility model are sometimes grouped together into a single embodiment, figure, or description thereof. However, the disclosed method should not be interpreted as reflecting the intention that the claimed utility model requires more features than those expressly recited in each claim. Rather, as reflected in the following claims, the aspects of the utility model lie in less than all the features of the single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into the detailed description, where each claim stands on its own as a separate embodiment of the present utility model.

[0043] In addition, those skilled in the art can understand that although some embodiments herein include certain features included in other embodiments rather than other features, the combination of features of different embodiments means that it is within the scope of the present utility model and forms different embodiments. For example, in the following claims, any one of the claimed embodiments can be used in any combination.

[0044] It should be noted that the above embodiments illustrate the present utility model rather than limit the present utility model, and those skilled in the art can design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in the claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present utility model can be implemented by means of hardware including several different elements and by means of a suitably programmed computer. In a unit claim listing several devices, several of these devices can be embodied by the same item of hardware. The use of the words first, second, and third, etc. does not denote any order. These words can be interpreted as names.

Claims

1. A high-voltage linear constant-power stroboscopic elimination LED driving circuit, connected to an LED load, characterized in that, It includes a capacitive path, a voltage dividing module, a first output module, a second output module, a sampling control module, a first output resistor R3, and a second output resistor R4. Among them, The input end of the capacitive path is connected to the mains power supply and is used to convert the mains power supply into a DC voltage; The input end of the first output module is connected to the first output end of the capacitive path, the input end of the second output module is connected to the second output end of the capacitive path, the output end of the first output module is connected to the LED load via the first output resistor R3, and the output end of the second output module is connected to the LED load via the second output resistor R4 and the first output resistor R3. When the DC voltage is greater than the voltage required by the LED load, the first output module and the second output module are turned on simultaneously. When the DC voltage is less than the voltage required by the LED load, the first output module is turned on and the second output module is turned off; The input end of the voltage dividing module is connected to the second output end of the capacitive path, and the first output end of the voltage dividing module is connected to the LED load and is used to generate a sampling signal according to the DC voltage; The input end of the sampling control module is connected to the second output end of the voltage dividing module and is used to generate a constant power control signal according to the sampling signal; The control end of the first output module is connected to the output end of the sampling control module and controls the current input to the LED load according to the constant power control signal.

2. The high-voltage linear constant-power stroboscopic-free LED driving circuit according to claim 1, wherein The capacitive path includes a rectifier bridge group Z1, a diode D0, and an input capacitor C0. The input end of the rectifier bridge group Z1 is connected to the mains power supply, the output end of the rectifier bridge group Z1 is connected to the input end of the voltage dividing module, the positive electrode of the diode D0, and the input end of the second output module. The negative electrode of the diode D0 is connected to the first end of the input capacitor C0 and the input end of the first output module. The second end of the input capacitor C0 is grounded.

3. The high-voltage linear constant-power stroboscopic-free LED driving circuit according to claim 2, wherein The voltage dividing module includes a first voltage dividing resistor R1 and a second voltage dividing resistor R2. The first end of the first voltage dividing resistor R1 is connected to the output end of the rectifier bridge group Z1. The second end of the first voltage dividing resistor R1 is connected to the first end of the second voltage dividing resistor R2 and the input end of the sampling control module. The second end of the second voltage dividing resistor R2 is connected to the LED load.

4. The high-voltage linear constant-power stroboscopic-free LED driving circuit according to claim 3, characterized in that The sampling control module includes an RC filter circuit, a peak sampling circuit, a clock module, and a constant power control module. The input end of the RC filter circuit and the input end of the clock module are connected to the second output end of the voltage dividing module. The output end of the RC filter circuit and the output end of the clock module are connected to the input end of the peak sampling circuit. The output end of the peak sampling circuit is connected to the input end of the constant power control module. The output end of the constant power control module is connected to the control end of the first output module. Among them, the sampling signal from the voltage dividing module is filtered by the RC filter circuit and then input into the peak sampling circuit. The peak sampling circuit processes the sampling signal under the control of the clock module and inputs the generated constant power sampling signal into the constant power control module. The constant power control module generates the constant power control signal according to the constant power sampling signal and outputs it to the first output module.

5. The high-voltage linear constant-power stroboscopic-free LED driving circuit according to claim 4, wherein, The peak sampling circuit includes a third operational amplifier AMP3, a first mirror tube N1, a second mirror tube N2, and a third mirror tube N3, a first capacitor C1, a second capacitor C2, a first switch CLK, and a second switch CKB_delay. The positive input end of the third operational amplifier AMP3 is connected to the output end of the RC filter circuit. The output end of the third operational amplifier AMP3 is connected to the base of the first mirror tube N1. The collector of the first mirror tube N1 is connected to the collector of the second mirror tube N2. The base of the second mirror tube N2 is connected to the base of the third mirror tube N3. The negative input end of the third operational amplifier AMP3 is connected to the first end of the second switch CKB_delay, the collector of the third mirror tube N3, the first end of the first capacitor C1, and the first end of the first switch CLK. The emitter of the first mirror tube N1 is grounded. The emitters of the third mirror tube N3 and the second mirror tube N2 are externally connected to a voltage. The first end of the first switch CLK is connected to the first end of the second capacitor C2 and the input end of the constant power control module. The second end of the second switch CKB_delay, the second end of the first capacitor C1, and the second end of the second capacitor C2 are grounded. The clock module controls the turn-off of the first switch CLK and the second switch CKB_delay.

6. The high-voltage linear constant-power stroboscopic-free LED driving circuit according to claim 4, wherein, The clock module includes a comparator COMP, an inverter INV1, a third switch, a fourth switch, and a clock signal generation unit. The first end of the third switch is connected to a first reference voltage. The first end of the fourth switch is connected to a second reference voltage. The second ends of the third switch and the fourth switch are connected to the positive input terminal of the comparator COMP. The negative input terminal of the comparator COMP is connected to the sampling signal. The output terminal of the comparator COMP is connected to the input terminal of the clock signal generation unit via the inverter INV1. The first output terminal of the clock signal generation unit is connected to the first switch. The second output terminal of the clock signal generation unit is connected to the second switch.

7. The high-voltage linear constant-power stroboscopic-free LED driving circuit according to claim 4, wherein The constant power control module includes a fourth operational amplifier AMP4, a driving transistor P1, a seventh resistor R7, a fourth mirror transistor P2, a fifth mirror transistor P3, and a constant current source. The positive input terminal of the fourth operational amplifier AMP4 is connected to the first end of the first switch CLK. The negative input terminal of the fourth operational amplifier AMP4 is connected to the first end of the seventh resistor R7 and the emitter of the driving transistor P1. The output terminal of the fourth operational amplifier AMP4 is connected to the base of the driving transistor P1. The collector of the driving transistor P1 is connected to the constant current source and the collector of the fourth mirror transistor P2. The base of the fourth mirror transistor P2 is connected to the base of the fifth mirror transistor P3. The collector of the fifth mirror transistor P3 is connected to the control terminal of the first output module. The emitters of the fourth mirror transistor P2 and the fifth mirror transistor P3 are externally connected to a voltage.

8. The high-voltage linear constant-power stroboscopic-free LED driving circuit according to claim 1, wherein, The first output module includes a first operational amplifier AMP1, a first output transistor M1, and a first constant power adjustment resistor R5. The positive input terminal of the first operational amplifier AMP1 is connected to a first reference signal. The negative input terminal of the first operational amplifier AMP1 is connected to the output terminal of the sampling control module and the first end of the first constant power adjustment resistor R5. The output terminal of the first operational amplifier AMP1 is connected to the base of the first output transistor M1. The collector of the first output transistor M1 is the input terminal of the first output module. The emitter of the first output transistor M1 is connected to the second end of the first constant power adjustment resistor R5 and serves as the output terminal of the first output module.

9. The high-voltage linear constant-power stroboscopic-free LED driving circuit according to claim 1, wherein The second output module includes a second operational amplifier AMP2, a second output transistor M2, and a second constant power adjustment resistor R6. The positive input terminal of the second operational amplifier AMP2 is connected to a second reference signal. The negative input terminal of the second operational amplifier AMP2 is connected to the first end of the constant power adjustment resistor R6. The output terminal of the second operational amplifier AMP2 is connected to the base of the second output transistor M2. The collector of the second output transistor M2 is the input terminal of the second output module. The emitter of the second output transistor M2 is connected to the second end of the second constant power adjustment resistor R6 and serves as the output terminal of the second output module.

10. An LED lamp, characterized in that, It includes the high-voltage linear constant power stroboscopic-free LED driving circuit according to any one of claims 1-9.

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