Constant current driving power supply and lamp

Abstract

The utility model relates to power supply technical field provides a kind of constant current drive power supply and lamps and lanterns, the constant current drive power supply includes: including: input rectifier module, constant current output module and voltage compensation module;The constant current output module includes voltage sampling point and switching circuit;The input rectifier module is used to rectifier output DC to the constant current output module;The output end of the voltage compensation module is connected the voltage sampling point, for the DC compensation voltage of configuration is loaded to the voltage sampling point;The constant current output module is used to control the on state of the switching circuit by the voltage signal of the voltage sampling point acquisition.The constant current drive power supply of the utility model can output corresponding size constant current according to different lamps and lanterns specifications.

Description

Technical Field

[0001] This utility model relates to the field of power supply technology, and in particular to a constant current drive power supply and a lamp. Background Technology

[0002] Due to the varying voltage, current, and luminous flux specifications of LEDs, different projects require different LED luminaires with varying series and parallel connection methods, resulting in different output currents from the constant current power supply modules in the LED driver. While the output voltage of a constant current power supply module typically has a certain adaptation range, its output current is fixed, making it impossible to flexibly meet the current requirements of different LED luminaire specifications. This leads to a wide variety of driver power supplies in actual production applications; different LED luminaire specifications require corresponding driver power supplies. Consequently, there are many types of materials, making it impossible to reduce material costs through bulk procurement. This also increases production complexity, preventing cost reduction through large-scale production. Therefore, how to adjust the output current of the constant current power supply module according to different current requirements is a pressing technical problem that needs to be solved. Utility Model Content

[0003] This utility model provides a constant current driving power supply and a lamp to solve the problem that in the prior art, the constant current power supply module can only output a fixed constant current and cannot adjust the constant current according to different specifications of lamps.

[0004] This utility model provides a constant current driving power supply, including: an input rectification module, a constant current output module, and a voltage compensation module; the constant current output module includes a voltage sampling point and a switching circuit;

[0005] The input rectifier module is used to rectify and output DC power to the constant current output module;

[0006] The output terminal of the voltage compensation module is connected to the voltage sampling point, and is used to apply the configured DC compensation voltage to the voltage sampling point;

[0007] The constant current output module is used to control the conduction state of the switching circuit through the voltage signal acquired by the voltage sampling point.

[0008] According to the constant current driving power supply provided by this utility model, the DC power output by the input rectifier module is output to the constant current output module through the main power path. The constant current output module further includes a control element and an energy storage element. The main power path is the path from the output terminal of the input rectifier module through the energy storage element to ground. The voltage sampling point is set on the main power path. The switching circuit is connected in series on the main power path. The control element is connected to the voltage sampling point and the energy storage element.

[0009] According to the constant current driving power supply provided by this utility model, the voltage compensation module includes: a pulse signal generation module and a pulse signal rectification module, wherein the output terminal of the pulse signal rectification module is connected to a voltage sampling point;

[0010] The pulse signal generation module is used to generate a pulse voltage according to the voltage compensation parameters and output the pulse voltage to the pulse signal rectification module;

[0011] The pulse signal rectification module is used to convert the pulse voltage into the DC compensation voltage.

[0012] According to the constant current driving power supply provided by this utility model, the pulse signal generation module is a wireless communication module with the function of generating pulse voltage.

[0013] According to the constant current driving power supply provided by this utility model, the pulse signal rectification module includes: at least one stage of filtering circuit, the input terminal of the filtering circuit is connected to the pulse voltage output terminal of the pulse signal generation module, and the output terminal of the filtering circuit is connected to the voltage sampling point.

[0014] According to the constant current driving power supply provided by this utility model, the pulse signal rectification module includes a two-stage RC filter circuit. The input terminal of the first-stage RC filter circuit is connected to the pulse voltage output terminal of the pulse signal generation module, and the output terminal of the second-stage RC filter circuit is connected to the voltage sampling point.

[0015] According to the constant current driving power supply provided by this utility model, the pulse signal rectification module further includes a current limiting resistor, which is disposed between the filter circuit and the voltage sampling point.

[0016] According to the constant current driving power supply provided by this utility model, the pulse signal rectification module further includes: a voltage divider circuit, which is used to divide the output voltage of the filter circuit and connect it to the voltage sampling point through the current limiting resistor.

[0017] This utility model also provides a lamp, comprising: a light source and a constant current driving power supply as described in any one of the above claims, wherein the constant current driving power supply is used to drive the light source.

[0018] The constant current drive power supply and lamp provided by this utility model compensate the voltage sampling point through a voltage compensation module. Different compensation values ​​result in different times for the sampling voltage at the voltage sampling point to reach the calibrated voltage. The energy storage capacity of the energy storage element in the constant current output module also varies. Different energy storage capacities result in different output constant current values, thereby realizing the adjustment of the constant current output by the constant current drive power supply. This allows the constant current drive power supply to output a corresponding constant current according to different lamp specifications. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the constant current drive power supply structure provided by this utility model.

[0021] Figure 2 This is one of the specific circuit structure diagrams of the constant current drive power supply provided by this utility model.

[0022] Figure 3 This is the second specific circuit structure diagram of the constant current drive power supply provided by this utility model. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0024] The constant current drive power supply of this utility model embodiment, such as Figure 1 As shown, it includes: an input rectifier module 100, a constant current output module 200, and a voltage compensation module 300; the constant current output module 200 includes a voltage sampling point and a switching circuit.

[0025] The input rectifier module 100 is used to rectify and output DC power to the constant current output module 200. When the DC power passes through the voltage sampling point, a base voltage is generated. The input terminal of the input rectifier module 100 can be connected to the mains power to convert the AC voltage of the mains power into DC power. This DC power is usually high voltage (greater than 48V).

[0026] The output of the voltage compensation module 300 is connected to a voltage sampling point to configure and apply the DC compensation voltage to the voltage sampling point. After the DC compensation voltage is applied, the voltage at the voltage sampling point is the sum of the base voltage and the DC compensation voltage.

[0027] The constant current output module 200 is used to control the conduction state of the switching circuit through the voltage signal collected by the voltage sampling point. Since the energy storage element 202 in the constant current output module 200 is connected to the load (e.g., a lamp), the energy storage element 202 can store electrical energy when the switching circuit is in the conduction state, and output a constant current to the load based on the stored electrical energy when the switching circuit is off.

[0028] In this embodiment, the voltage compensation module 300 compensates the voltage sampling points. Different compensation values ​​result in different times for the sampled voltage to reach the calibrated voltage, and consequently, different amounts of energy stored in the energy storage element 202 of the constant current output module 200. These different energy storage values ​​lead to different amounts of constant current output, thus regulating the constant current output of the constant current drive power supply. This allows the constant current drive power supply to output a corresponding amount of constant current according to different lamp specifications. The constant current drive power supply in this embodiment is more versatile, eliminating the need to adapt different constant current drive power supplies for different lamp specifications, reducing the number of constant current drive power supply types. Material costs can be reduced by increasing the procurement of general-purpose materials, thereby lowering production costs. This method is particularly suitable for the lamp manufacturing stage. Before the lamps leave the factory, the voltage compensation module 300 can be configured to output different DC compensation voltages according to the specifications of different lamps, allowing the constant current drive power supply to match different lamp specifications.

[0029] In some embodiments, the constant current output module 200 is used to disconnect the switching circuit when the voltage signal collected at the voltage sampling point reaches the preset calibration voltage, so as to trigger the energy storage element in the constant current output module 200 to output a constant current.

[0030] For example, such as Figure 1 and 2 As shown, the constant current output module 200 also includes a control element 201 and an energy storage element 202. The DC power output from the input rectifier module 100 is output to the constant current output module 200 through the main power path. The main power path is the path from the output terminal of the input rectifier module 100 through the energy storage element 202 to ground. The voltage sampling point is set on the main power path, and the switching circuit is connected in series on the main power path. The control element 201 connects the voltage sampling point and the energy storage element 202. The control element 201 collects the voltage signal from the voltage sampling point. When the voltage signal collected by the voltage sampling point reaches the preset calibration voltage, the control switching circuit is turned off, and the energy storage element 202 outputs a constant current. The calibration voltage is set in the control element 201, and the energy storage element 202 is used to store electrical energy when the switching circuit is in the on state, and to output a constant current to the load based on the stored electrical energy when the switching circuit is turned off.

[0031] Specifically, such as Figure 2As shown, the constant current output module 200 is a flyback architecture. The control element 201 may include a flyback architecture control chip and a MOS switch Q1. For example, the flyback architecture control chip can be a BP3179F chip, which is an isolated low-PF (power factor) LED constant current drive controller suitable for flyback circuits. The energy storage element 202 mainly includes an energy storage transformer T1. The input terminal of the energy storage transformer T1 is connected to the output terminal of the input rectifier module 100 (i.e.,...). Figure 2 (The positive terminal of the electrolytic capacitor EC1). The main power path is from the positive terminal of EC1 to the energy storage transformer T1, and then to ground. The switching circuit is a MOS switch Q1, which is connected in series in the main power path. A sampling resistor R8 is also provided in the main power path. The gate of the MOS switch Q1 is connected to a control terminal of the control chip (e.g., the GATE terminal of the BP3179F chip), the drain is connected to the primary winding of the energy storage transformer T1, and the source is connected to the first terminal of the sampling resistor R8. The second terminal of the sampling resistor R8 is grounded. That is, the energy storage transformer T1 is grounded after passing through the MOS switch Q1 and the sampling resistor R8.

[0032] The sampling terminal of the control chip (e.g., the CS terminal of the BP3179F chip) is connected to the first end of the sampling resistor R8 to detect the current in the main power path, or in other words, to detect the voltage across the sampling resistor R8. The first end of the sampling resistor R8 is the voltage sampling point. When the voltage across the sampling resistor R8 does not reach the internal calibration voltage of the control chip (different control chips have different calibration voltages), the current in the main power path flows to ground through the energy storage transformer T1. The energy storage transformer T1 stores electrical energy, and as more energy is stored, the current in the main power path increases, and the sampling voltage across the sampling resistor R8 also gradually increases. When the sampling voltage across the sampling resistor R8 reaches the internal calibration voltage of the control chip, the control chip controls the MOS switch Q1 to turn off through the control terminal (e.g., the GATE terminal of the BP3179F chip). After the MOS switch Q1 turns off, the current in the main power path can no longer flow to ground through the energy storage transformer T1. The energy storage transformer T1 no longer stores electrical energy, but instead outputs a constant current to the load terminal through the secondary winding based on the currently stored electrical energy.

[0033] The magnitude of the constant current depends on the amount of stored electrical energy; the more stored energy, the larger the constant current. The amount of stored energy depends on the time it takes for the sampled voltage to reach the calibrated voltage, which can be determined by adjusting the sampling resistor R8. In existing related technologies, the size of the sampling resistor R8 is usually determined based on the required constant current for different specifications of lamps. However, once the sampling resistor R8 is determined, the magnitude of the constant current cannot be adjusted and can only be adapted to the corresponding lamp specifications. In this embodiment, the voltage compensation module 300 configures a DC compensation voltage to compensate the voltage sampling point, i.e., compensation... Figure 2The sampling voltage sampled by the CS terminal of the control chip is the sum of the voltage of the sampling resistor R8 (i.e., the base voltage) and the DC compensation voltage output by the voltage compensation module 300. The larger the voltage output by the voltage compensation module 300, the shorter the time for the sampling voltage to reach the calibrated voltage, the less electrical energy stored in the energy storage transformer T1, and the smaller the constant current output by its secondary winding to the load end, thereby realizing the adjustment of the constant current magnitude.

[0034] In some embodiments, the voltage compensation module 300 includes a pulse signal generation module 301 and a pulse signal rectification module 302.

[0035] The pulse signal generation module 301 is used to generate a pulse voltage according to the voltage compensation parameters and output the pulse voltage to the pulse signal rectification module 302. The voltage compensation parameters are externally input parameters that can be set by the user; different voltage compensation parameters result in different generated pulse voltages.

[0036] The pulse signal rectifier module 302 is used to convert the pulse voltage into a DC compensation voltage; different pulse voltages will be converted into different DC compensation voltages. The output terminal of the pulse signal rectifier module 302 is connected to a voltage sampling point, and the DC compensation voltage is output to the voltage sampling point for voltage compensation.

[0037] Specifically, the pulse signal generation module 301 can be a functional module that can generate pulse voltage. Different voltage compensation parameters can generate different pulse voltages. The pulse signal rectification module 302 can convert different pulse voltages into DC compensation voltages of different magnitudes, thereby achieving compensation for different voltages at the voltage sampling point, and thus enabling the energy storage element 202 to output a constant current of the corresponding magnitude.

[0038] In some embodiments, the voltage compensation parameters include the target constant current I to be output, and the pulse signal generation module 301 is used to determine the duty cycle D according to the target constant current I to be output according to the following formula, and generate the pulse voltage based on the duty cycle D.

[0039] I = K·D + Imax;

[0040] K = Imin - Imax.

[0041] Where I is the target constant current to be output, that is, the constant current output by the energy storage element 202; Imax and Imin represent the maximum and minimum constant currents that the energy storage element 202 can output, respectively; and D represents the duty cycle. The pulse voltage can be a pulse width modulation (PWM) signal, and the pulse signal generation module 301 only needs to be a functional module capable of generating PWM signals. Furthermore, the duty cycle of the PWM signal also determines the magnitude of the DC compensation voltage after rectification by the pulse signal rectification module 302.

[0042] Specifically, the larger the duty cycle D of the pulse voltage, the larger the DC voltage signal value after rectification by the pulse signal rectifier module 302, i.e., the larger the compensated voltage, the smaller the constant current output by the energy storage element 202. Therefore, the duty cycle D and the constant current have an inverse linear relationship. Imax is the constant current corresponding to a duty cycle D of 0, and Imin is the constant current corresponding to a duty cycle D of 100%. After the pulse signal generation module 301 is selected, the high-level voltage value of the pulse voltage signal it generates is determined. Therefore, Imax and Imin are known quantities, i.e., the coefficient K is a known quantity, thus obtaining the linear formula for I and D.

[0043] In this embodiment, the above linear formula is written into the pulse signal generation module 301 in the form of a program. The user only needs to input the final required constant current value into the pulse signal generation module 301, making the user operation more convenient and faster.

[0044] In some embodiments, the pulse signal generation module 301 is a wireless communication module with the function of generating pulse voltage signals. It can not only generate pulse voltage, but also facilitate users to write voltage compensation parameters to the pulse signal generation module 301 wirelessly.

[0045] Specifically, the pulse signal generation module 301 can be a Near Field Communication (NFC) module (including an NFC chip and an NFC antenna). Users can interact with this NFC module using a handheld terminal with NFC functionality (such as a mobile phone) to write voltage compensation parameters into the NFC module. For example, the pulse signal generation module 301 can be an FM11NP04NP04, which is an NFC dual-interface smart tag chip conforming to the ISO / IEC 14443-A protocol. Figure 2As shown, this NFC module generates a 13.56MHz resonant frequency through the NFC antenna on the circuit board and capacitors C5 and C6. External NFC readers / writers can communicate with the NFC chip via the NFC antenna. After establishing communication, the external NFC reader / writer can configure parameters such as the frequency and duty cycle of the NFC chip's output PWM signal. This configured data is stored in the NFC chip's internal EEPROM memory and is retained even after power loss. Subsequent power-ups will always output the configured PWM signal unless reconfigured by the NFC reader / writer. Furthermore, this NFC chip integrates a high-efficiency MCU and EEPROM memory, eliminating the need for an additional MCU, resulting in a high degree of integration of the constant current drive power supply and saving on component costs.

[0046] In some embodiments, the pulse signal rectification module 302 includes at least one stage of filtering circuit, wherein the input terminal of the filtering circuit is connected to the pulse voltage output terminal of the pulse signal generation module 301, and the output terminal of the filtering circuit is connected to the voltage sampling point, and the filtering circuit is used to filter the pulse voltage into a DC compensation voltage.

[0047] Specifically, the filter circuit can be an RC filter circuit. The pulse voltage is filtered according to its duty cycle to obtain a DC compensation voltage. Different duty cycles result in different magnitudes of DC compensation voltage, thereby achieving voltage compensation for different voltage sampling points, which in turn enables the energy storage element 202 to output a constant current of the corresponding magnitude.

[0048] like Figure 2 As shown, in some embodiments, the pulse signal rectification module 302 includes a two-stage RC filter circuit. The input terminal of the first-stage RC filter circuit is connected to the pulse voltage output terminal of the pulse signal generation module 301, and the output terminal of the second-stage RC filter circuit is connected to the voltage sampling point.

[0049] Specifically, the first-stage RC filter circuit includes a first resistor R1 and a first capacitor C1, and the second-stage RC filter circuit includes a second resistor R2 and a second capacitor C2. The first end of the first resistor R1 is connected to a pulse voltage output terminal of the NFC module, for example, to a PWM signal output terminal of the FM11NP04NP04. The second end of the first resistor R1 is connected to the first end of the first capacitor C1, and the second end of the first capacitor C1 is grounded. The first end of the second resistor R2 is connected to the second end of the first resistor R1, and the second end of the second resistor R2 is connected to the first end of the second capacitor C2, and the second end of the second capacitor C2 is grounded. The voltage at the first end of the second capacitor C2 is the filtered DC compensation voltage.

[0050] In this embodiment, the first-stage RC filter circuit flattens the pulse voltage signal into a DC compensation voltage, and the second-stage RC filter circuit is used to flatten the voltage fluctuations on the DC compensation voltage, making the filtered DC compensation voltage more stable, thereby making the constant current output by the energy storage element 202 more accurate.

[0051] In some embodiments, the pulse signal rectification module 302 further includes a current-limiting resistor, which is disposed between the filter circuit and the voltage sampling point. Specifically, as shown... Figure 2 As shown, the fifth resistor R5 is a current-limiting resistor, placed between the filter circuit and the voltage sampling point. The first end of the fifth resistor R5 is connected to the filter circuit, and the second end is connected to the voltage sampling point. The voltage across the fifth resistor R5 is the filtered DC compensation voltage. The fifth resistor R5 is a current-limiting resistor used to limit the current flowing into the control chip (i.e., control element 201) to protect the control chip from damage.

[0052] In some embodiments, the pulse signal rectification module 302 further includes a voltage divider circuit, which is used to divide the output voltage of the filter circuit and connect it to the voltage sampling point through the current-limiting resistor. Specifically, as shown in the figure... Figure 2 As shown, the voltage divider circuit includes a third resistor R3 and a fourth resistor R4. Resistors R3 and R4 are positioned between the two-stage RC filter circuit and the voltage sampling point. The first terminal of the third resistor R3 is connected to the first terminal of the second capacitor C2, and the second terminal of the third resistor R3 is connected to the first terminal of the fourth resistor R3. The second terminal of the fourth resistor R4 is grounded, and the first terminal of the fourth resistor R4 is connected to a current-limiting resistor, i.e., the fifth resistor R5. The voltage at the first terminal of the fourth resistor R4 is the filtered DC compensation voltage. Both the third resistor R3 and the fourth resistor R4 are voltage divider resistors used to divide the DC voltage across the second capacitor C2, reducing it to a suitable voltage range so that when the voltage in this range is used to compensate the voltage sampling point, the required constant current can be obtained.

[0053] Of course, if the first-stage filter is sufficient to flatten the PWM signal to meet design requirements, the second-stage filter can be omitted.

[0054] by Figure 2 Taking the circuit structure in the example above, the working scenario and principle of the constant current drive power supply in the above embodiment are explained as follows:

[0055] During the manufacturing process of the lamps, for lamps of different specifications, the user writes the corresponding voltage compensation parameters into the pulse signal generation module 301. Specifically, the NFC terminal device interacts with the NFC chip through the NFC antenna of the NFC module to write the voltage compensation parameters into the NFC chip. The voltage compensation parameters can be the constant current I corresponding to the lamp specification. The NFC chip calculates the duty cycle D according to the constant current using the formula mentioned above (of course, the duty cycle D can also be set directly). Then, it generates a PWM signal based on the duty cycle. For example, for FM11NP04NP04, the high level of the generated PWM signal is 3.3V and the low level is 0V.

[0056] The NFC chip outputs the generated PWM signal to the pulse signal rectification module 302. Specifically, the NFC chip outputs the generated PWM signal to the RC filter circuit. Figure 2 The circuit consists of two stages of RD filtering and two stages of RC filtering. The final voltage across the second capacitor C2 is the filtered DC voltage. When the PWM signal duty cycle is 100%, the voltage across the second capacitor C2 is a maximum of 3.3V; when the PWM signal duty cycle is 0%, the voltage across the second capacitor C2 is a minimum of 0V; and when the PWM signal duty cycle is 50%, the voltage across the second capacitor C2 is 1.5V. That is, the DC voltage across the second capacitor C2 is directly proportional to the PWM signal duty cycle, satisfying the following formula: V c2 =3.3·D, where 3.3V is the maximum voltage of the PWM signal, and the voltage on the second capacitor C2 is between 0 and 3.3V.

[0057] The third resistor R3 and the fourth resistor R4 are voltage divider resistors, which divide the DC voltage on the second capacitor C2 to reduce the DC voltage to a suitable voltage range. The voltage after voltage division is then sampled at the voltage sampling point after current limiting by the fifth resistor R5, which is the CS pin of the control chip. At this time, the sampling voltage of the CS pin is the sum of the voltage on R5 and the voltage on R8.

[0058] By setting a constant current I in the NFC chip, the duty cycle D is calculated based on the constant current I, or the duty cycle D is set directly. Different duty cycles D result in different DC voltage signals after passing through the pulse signal rectification module 302, thereby enabling the energy storage element 202 to output a constant current of corresponding magnitude.

[0059] It should be noted that: Figure 2 In the flyback architecture, the MOS switch Q1 can also be integrated inside the control chip, and the topology of the constant current output module 200 is not limited to the flyback architecture of the above embodiments; it can also be a BUCK architecture, such as... Figure 3As shown, for example, the control chip is BP2878K, and the output terminal of the pulse signal rectification module 302 of the voltage compensation module 300 is connected to the CS terminal of the chip. The working principle is basically the same as the above embodiments, and will not be described again here.

[0060] This utility model embodiment also provides a lamp, including: a light source and a constant current driving power supply as described in any of the above embodiments, wherein the light source can be an LED light source, and the constant current driving power supply is used to drive the light source. Because this lamp has the aforementioned constant current driving power supply, it also possesses the corresponding technical effects.

[0061] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A constant current drive power supply, characterized in that, include: The system includes an input rectifier module, a constant current output module, and a voltage compensation module; the constant current output module includes a voltage sampling point and a switching circuit. The input rectifier module is used to rectify and output DC power to the constant current output module; The output terminal of the voltage compensation module is connected to the voltage sampling point, and is used to apply the configured DC compensation voltage to the voltage sampling point; The constant current output module is used to control the conduction state of the switching circuit through the voltage signal acquired by the voltage sampling point.

2. The constant current drive power supply according to claim 1, characterized in that, The DC power output from the input rectifier module is output to the constant current output module through the main power path. The constant current output module further includes a control element and an energy storage element. The main power path is the path from the output terminal of the input rectifier module through the energy storage element to ground. The voltage sampling point is set on the main power path. The switching circuit is connected in series on the main power path. The control element is connected to the voltage sampling point and the energy storage element.

3. The constant current drive power supply according to claim 1, characterized in that, The voltage compensation module includes a pulse signal generation module and a pulse signal rectification module, wherein the output terminal of the pulse signal rectification module is connected to a voltage sampling point; The pulse signal generation module is used to generate a pulse voltage according to the voltage compensation parameters and output the pulse voltage to the pulse signal rectification module; The pulse signal rectification module is used to convert the pulse voltage into the DC compensation voltage.

4. The constant current drive power supply according to claim 3, characterized in that, The pulse signal generation module is a wireless communication module with the function of generating pulse voltage.

5. The constant current drive power supply according to claim 3, characterized in that, The pulse signal rectification module includes at least one stage of filtering circuit, the input terminal of which is connected to the pulse voltage output terminal of the pulse signal generation module, and the output terminal of which is connected to the voltage sampling point.

6. The constant current drive power supply according to claim 5, characterized in that, The pulse signal rectification module includes a two-stage RC filter circuit. The input of the first-stage RC filter circuit is connected to the pulse voltage output of the pulse signal generation module, and the output of the second-stage RC filter circuit is connected to the voltage sampling point.

7. The constant current drive power supply according to claim 5, characterized in that, The pulse signal rectification module further includes a current-limiting resistor, which is disposed between the filter circuit and the voltage sampling point.

8. The constant current drive power supply according to claim 7, characterized in that, The pulse signal rectification module further includes a voltage divider circuit, which is used to divide the output voltage of the filter circuit and connect it to the voltage sampling point through the current limiting resistor.

9. A lamp, characterized in that, include: The light source and the constant current driving power supply according to any one of claims 1 to 8, wherein the constant current driving power supply is used to drive the light source.

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