LED constant-current light source driver and LED constant-current light source driving method

Abstract

The invention discloses an LED constant-current light source driver and an LED constant-current light source driving method, and relates to the field of LED light source drivers, and the LED constant-current light source driver comprises a numerical control constant-voltage power supply module, a current adjustment sampling module, a light source detection module, an analog-digital conversion module and a regulation and control module. The numerical control constant voltage power supply module is used for providing a stable and adjustable voltage source for the current adjustment sampling module; the current adjusting and sampling module is used for adjusting the conduction degree to keep the current constant, sampling the current of the LED light source and sending a sampling result to the regulation and control module; the light source detection module is used for detecting the voltage of the LED light source and sending a detection result to the analog-digital conversion module; the analog-digital conversion module is used for converting the detection result into a digital detection result and sending the digital detection result to the regulation and control module; the regulation module is used for generating regulation electric signals and sending the regulation electric signals to the numerical control constant-voltage power supply module. The output voltage is automatically adjusted according to the voltage of the LED light source, and the requirement for voltage adjustment in a large range can be met.

Description

Technical Field

[0001] This application relates to the field of LED light source drivers, and particularly to an LED constant current light source driver and an LED constant current light source driving method. Background Art

[0002] When an LED (Light Emitting Diode) light source operates normally, a constant direct current needs to be provided to it. Therefore, an LED light source driver is required to convert the grid voltage into direct current and supply it to the LED light source. In use, the existing LED light source drivers in the prior art need to provide a matching power input voltage according to the LED voltage specifications. However, due to the diverse voltage specifications of LED light sources and the limited adjustment range of existing LED light source drivers, the demand for voltage adjustment within a large range cannot be met. Summary of the Invention

[0003] In view of the above-mentioned defects or deficiencies in the related art, the purpose of this application is to provide an LED constant current light source driver and an LED constant current light source driving method, which can automatically adjust the output voltage according to the LED light source voltage and can meet the voltage adjustment requirements within a large range.

[0004] To achieve the above purpose, this application provides the following solutions:

[0005] In a first aspect, this application provides an LED constant current light source driver, which includes: a numerically controlled constant voltage power supply module, a current adjustment and sampling module, a light source detection module, an analog-to-digital conversion module, and a regulation module; a first input end of the numerically controlled constant voltage power supply module is connected to an external constant voltage power supply, an output end of the numerically controlled constant voltage power supply module is connected to an input end of the current adjustment and sampling module, a first output end of the current adjustment and sampling module is connected to an input end of the light source detection module through an LED light source, a second output end of the current adjustment and sampling module is connected to a first input end of the regulation module, an output end of the light source detection module is connected to an input end of the analog-to-digital conversion module, an output end of the analog-to-digital conversion module is connected to a second input end of the regulation module, and an output end of the regulation module is connected to a second input end of the numerically controlled constant voltage power supply module;

[0006] Among them, the numerically controlled constant voltage power supply module is used to respond to the regulation electrical signal sent by the regulation module and provide a stable and adjustable voltage source for the current adjustment and sampling module; the current adjustment and sampling module is used to adjust the conduction degree based on the target constant current value and the LED light source current value to keep the current constant, so that the LED light source works; and is used to sample the current of the LED light source in the working state and send the sampling result to the regulation module; the light source detection module is used to detect the voltage of the LED light source in the working state and send the detection result to the analog-to-digital conversion module; the analog-to-digital conversion module is used to convert the detection result into a digital detection result and send the digital detection result to the regulation module; the regulation module is used to generate the regulation electrical signal based on the sampling result, the digital detection result and the LED light source voltage, and send the regulation electrical signal to the numerically controlled constant voltage power supply module.

[0007] Optionally, the numerically controlled constant voltage power supply module includes: a first chip and a digital potentiometer; the first chip includes a first input pin, a second input pin and an output pin; the digital potentiometer is connected to the second input pin; the numerically controlled constant voltage power supply module is connected to an external constant voltage power supply through the first input pin; the numerically controlled constant voltage power supply module is connected to the regulation module through the second input pin and the digital potentiometer; the numerically controlled constant voltage power supply module is connected to the current adjustment and sampling module through the output pin; among them, the digital potentiometer and the first chip are combined to dynamically adjust the resistance value of the digital potentiometer based on the regulation electrical signal to offset the voltage of the external constant voltage power supply and provide a stable and adjustable voltage source for the current adjustment and sampling module.

[0008] Optionally, the current adjustment and sampling module includes: an adjustment tube and a negative feedback circuit; the current adjustment and sampling module is connected to the numerically controlled constant voltage power supply module through the first input end of the adjustment tube; the current adjustment and sampling module is connected to the LED light source through the output end of the adjustment tube; the input end of the negative feedback circuit is connected to the output end of the adjustment tube; the first output end of the negative feedback circuit is connected to the second input end of the adjustment tube; the current adjustment and sampling module is connected to the first input end of the regulation module through the second output end of the feedback circuit; among them, the negative feedback circuit is used to adjust the conduction degree of the adjustment tube based on the target constant current value and / or the LED light source current value to keep the current constant.

[0009] Optionally, the current adjustment and sampling module further includes: a current sampling circuit; an input end of the current sampling circuit is connected to an output end of the adjustment tube; the current adjustment and sampling module is connected to the LED light source through a first output end of the current sampling circuit; an input end of the negative feedback circuit is connected to the output end of the adjustment tube through a second output end of the current sampling circuit; wherein, the current sampling circuit is configured to sample the current of the LED light source in the working state, and send the sampling result to the regulation module through the negative feedback circuit.

[0010] Optionally, the light source detection module includes: a differential amplifier; a first output end of the current adjustment and sampling module is connected to a first input end of the differential amplifier through a positive electrode of the LED light source; a first output end of the current adjustment and sampling module is connected to a second input end of the differential amplifier through a negative electrode of the LED light source; the light source detection module is connected to an input end of the analog-to-digital conversion module through an output end of the differential amplifier; wherein, the differential amplifier is configured to amplify a differential mode signal of the LED light source, the light source detection module is configured to detect the amplified differential mode signal of the LED light source to obtain a detection result, and send the detection result to the analog-to-digital conversion module; the detection result is an analog signal.

[0011] Optionally, the analog-to-digital conversion module includes: a second chip; the analog-to-digital conversion module is connected to the LED light source through an input pin of the second chip; the analog-to-digital conversion module is connected to a second input end of the regulation module through an output pin of the second chip; wherein, the second chip is configured to convert the detection result from an analog signal into a digital signal, and send the obtained digital detection result after conversion to the regulation module.

[0012] Optionally, the regulation module includes: a controller; the regulation module receives the digital detection result and the sampling result through a receiving end of the controller; the regulation module sends the regulation electrical signal to the numerically controlled constant voltage power supply module through a sending end of the controller.

[0013] Optionally, the regulation module further includes a communication interface or an input interface; the regulation module is further configured to: receive regulation parameters input by a user through the communication interface or the input interface, and send the regulation parameters to the controller; the regulation parameters include the target constant current value and the target constant voltage value; the controller generates the regulation electrical signal in response to the regulation parameters, and sends the regulation electrical signal to the numerically controlled constant voltage power supply module.

[0014] On the other hand, the present application provides an LED constant current light source driving method, which is applied to the LED constant current light source driver described in any one of the above, and the LED constant current light source driving method includes:

[0015] The numerically controlled constant voltage power supply module responds to the regulation electrical signal sent by the regulation module and provides a stable and adjustable voltage source for the current adjustment and sampling module;

[0016] The current adjustment and sampling module adjusts the conduction degree based on the voltage source output by the numerically controlled constant voltage power supply module to keep the current constant, so that the LED light source works; and samples the current of the LED light source in the working state and sends the sampling result to the regulation module;

[0017] The light source detection module detects the voltage of the LED light source in the working state and sends the detection result to the analog-to-digital conversion module;

[0018] The analog-to-digital conversion module converts the detection result into a digital detection result and sends the digital detection result to the regulation module;

[0019] The regulation module generates the regulation electrical signal based on the sampling result, the digital detection result, and the LED light source voltage, and sends the regulation electrical signal to the numerically controlled constant voltage power supply module.

[0020] Optionally, the method further includes: a communication interface or an input interface receives the regulation parameters input by the user and sends the regulation parameters to the controller; the controller responds to the regulation parameters to generate the regulation electrical signal and sends the regulation electrical signal to the numerically controlled constant voltage power supply module.

[0021] According to the specific embodiments provided by the present application, the present application discloses the following technical effects:

[0022] The present application provides an LED constant-current light source driver and an LED constant-current light source driving method. The LED constant-current light source driver includes a numerically controlled constant-voltage power supply module, a current adjustment and sampling module, a light source detection module, an analog-to-digital conversion module, and a regulation module. The numerically controlled constant-voltage power supply module receives and responds to the regulation electrical signal sent by the regulation module, and provides a stable and adjustable voltage source for the current adjustment and sampling module. The current adjustment and sampling module adjusts the conduction degree through the target constant current value and the LED light source current value to keep the current constant, so that the LED light source works, and samples the current of the LED light source in the working state and sends the sampling result to the regulation module. The analog-to-digital conversion module receives the detection result, converts the detection result into a digital detection result and sends the digital detection result to the regulation module. The regulation module generates a regulation electrical signal through the received sampling result, digital detection result, and LED light source voltage, and sends the regulation electrical signal to the numerically controlled constant-voltage power supply module. Compared with the prior art, it no longer relies on an externally provided matching constant-voltage power supply, can automatically adjust the output voltage according to the voltage of the LED light source to adapt to the voltage requirements of different LED light sources, effectively meets the voltage adjustment requirements in a large range, and realizes the closed-loop regulation of the LED light source voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0024] Figure 1 FIG. is a schematic structural diagram of an LED constant-current light source driver provided by an embodiment of the present application;

[0025] Figure 2 FIG. is a schematic structural diagram of the numerically controlled constant-voltage power supply module provided by an embodiment of the present application;

[0026] Figure 3 FIG. is a schematic structural diagram of the light source detection module provided by an embodiment of the present application;

[0027] Figure 4 FIG. is a schematic structural diagram of the analog-to-digital conversion module provided by an embodiment of the present application;

[0028] Figure 5 FIG. is a schematic flow chart of the LED constant-current light source driving method provided by an embodiment of the present application.

[0029] Description of reference numerals: 100, LED constant current light source driver; 200, external constant voltage power supply; 300, LED light source; 10, digital control constant voltage power supply module; 20, current adjustment and sampling module; 21, adjustment tube; 22, negative feedback circuit; 23, current sampling circuit; 30, light source detection module; 40, analog-to-digital conversion module; 50, regulation module; 51, controller; 52, communication interface or input interface. Detailed implementation manners

[0030] Next, the technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0031] To make the above objects, features, and advantages of the present application more obvious and understandable, the present application will be further described in detail below with reference to the drawings and specific implementation manners.

[0032] In an exemplary embodiment, an LED constant current light source driver is provided, as Figure 1 shown. The LED constant current light source driver 100 includes: a digital control constant voltage power supply module 10, a current adjustment and sampling module 20, a light source detection module 30, an analog-to-digital conversion module 40, and a regulation module 50. Among them, the digital control constant voltage power supply module 10 is connected to the external constant voltage power supply 200 to supply power to the current adjustment and sampling module 20, the LED light source 300, the light source detection module 30, the analog-to-digital conversion module 40, and the regulation module 50. Specifically:

[0033] The first input end of the digital control constant voltage power supply module 10 is connected to the external constant voltage power supply 200, the output end of the digital control constant voltage power supply module 10 is connected to the input end of the current adjustment and sampling module 20, the first output end of the current adjustment and sampling module 20 is connected to the input end of the light source detection module 30 through the LED light source 300, the second output end of the current adjustment and sampling module 20 is connected to the first input end of the regulation module 50, the output end of the light source detection module 30 is connected to the input end of the analog-to-digital conversion module 40, the output end of the analog-to-digital conversion module 40 is connected to the second input end of the regulation module 50, and the output end of the regulation module 50 is connected to the second input end of the digital control constant voltage power supply module 10;

[0034] Among them, the numerically controlled constant voltage power supply module 10 is used to respond to the regulation electrical signal sent by the regulation module 50 and provide a stable and adjustable voltage source for the current adjustment and sampling module 20; the current adjustment and sampling module 20 is used to adjust the conduction degree based on the target constant current value and the current value of the LED light source 300 to keep the current constant, so that the LED light source 300 works; and is used to sample the current of the LED light source 300 in the working state and send the sampling result to the regulation module 50; the source detection module is used to detect the voltage of the LED light source 300 in the working state and send the detection result to the analog-to-digital conversion module 40; the analog-to-digital conversion module 40 is used to convert the detection result into a digital detection result and send the digital detection result to the regulation module 50; the regulation module 50 is used to generate a regulation electrical signal based on the sampling result, the digital detection result and the voltage of the LED light source 300, and send the regulation electrical signal to the numerically controlled constant voltage power supply module 10.

[0035] In the embodiment provided by the present application, the LED constant current light source driver 100 includes a numerically controlled constant voltage power supply module 10, a current adjustment and sampling module 20, a light source detection module 30, an analog-to-digital conversion module 40, and a regulation module 50; the numerically controlled constant voltage power supply module 10 receives and responds to the regulation electrical signal sent by the regulation module 50 and provides a stable and adjustable voltage source for the current adjustment and sampling module 20; the current adjustment and sampling module 20 adjusts the conduction degree through the target constant current value and the current value of the LED light source 300 to keep the current constant, so that the LED light source 300 works, and samples the current of the LED light source 300 in the working state and sends the sampling result to the regulation module 50; the analog-to-digital conversion module 40 receives the detection result, converts the detection result into a digital detection result and sends the digital detection result to the regulation module 50; the regulation module 50 generates a regulation electrical signal through the received sampling result, digital detection result and the voltage of the LED light source 300, and sends the regulation electrical signal to the numerically controlled constant voltage power supply module 10. Compared with the prior art, it no longer relies on an externally provided matching constant voltage power supply, can automatically adjust the output voltage according to the voltage of the LED light source to adapt to the voltage requirements of different LED light sources 300, effectively meets the voltage adjustment requirements in a large range, and realizes the closed-loop regulation of the voltage of the LED light source 300.

[0036] Further, as Figure 2As shown in the figure, the numerically controlled constant voltage power supply module 10 includes: a first chip and a digital potentiometer; an external constant voltage power supply 200 is connected to the pin EN of the first chip through the first input end of the numerically controlled constant voltage power supply module 10; the regulation module 50 is connected to the digital potentiometer through the second output end of the numerically controlled constant voltage power supply module 10. The first output end of the numerically controlled constant voltage power supply module 10 is connected to a capacitor filter circuit composed of capacitor C22, capacitor C15, and capacitor C23 to filter out high-frequency and low-frequency noise in the external constant voltage power supply 200, making the input power supply purer. Resistors R2, R3, and capacitor C4 form a voltage division or filter network to provide a suitable input voltage monitoring signal for the first chip. The second input end of the numerically controlled constant voltage power supply module 10 is connected to the digital potentiometer, and the digital potentiometer can change the voltage signal input to the VOUT pin of the first chip by adjusting its own resistance value. The pin FB of the first chip is connected to a feedback network composed of resistors R1, R4, capacitor C1, capacitor C3, etc., which can feedback the output voltage signal of the digital potentiometer back to the first chip. The first chip adjusts the internal control signal according to the feedback signal to stabilize the output voltage.

[0037] It should be noted that by combining the digital potentiometer and the first chip, the numerically controlled constant voltage power supply module 10 can receive the control of the regulation module 50 and output a voltage suitable for the LED light source 30. The digital potentiometer in the embodiment of the present application can adopt MCP4017 of MICROCHIP Company, and the first chip can adopt LM5116 produced by TI Company. The regulation module 50 transmits the regulation electrical signal to the digital potentiometer, and the digital potentiometer changes its own resistance value according to the regulation electrical signal, so that the voltage of the feedback network of the numerically controlled constant voltage power supply module 10 changes. The first chip adjusts the output voltage according to the voltage change, so as to adjust the output voltage of the numerically controlled constant voltage power supply module 10 to a voltage suitable for the LED light source 30 according to the regulation electrical signal of the regulation module 50. That is, the resistance value of the digital potentiometer is dynamically adjusted according to the regulation electrical signal to offset the voltage of the external constant voltage power supply 200 to provide a stable and adjustable voltage source for the LED light source 30.

[0038] Furthermore, the current adjustment and sampling module 20 includes: an adjustment transistor 21 and a negative feedback circuit 22; the current adjustment and sampling module 20 is connected to the output end of the numerically controlled constant voltage power supply module 10 through the first input end of the adjustment transistor 21; the current adjustment and sampling module 20 is connected to the LED light source 300 through the output end of the adjustment transistor 21; the input end of the negative feedback circuit 22 is connected to the output end of the adjustment transistor 21; the first output end of the negative feedback circuit 22 is connected to the second input end of the adjustment transistor 21; the current adjustment and sampling module 20 is connected to the first input end of the regulation module 50 through the second output end of the feedback circuit.

[0039] Further, the above-mentioned current adjustment and sampling module 20 further includes: a current sampling circuit 23; the input end of the current sampling circuit 23 is connected to the output end of the adjustment transistor 21; the current adjustment and sampling module 20 is connected to the LED light source 300 through the first output end of the current sampling circuit 23; the input end of the negative feedback circuit 22 is connected to the output end of the adjustment transistor 21 through the second output end of the current sampling circuit 23.

[0040] As can be understood from the above embodiments, the negative feedback circuit 22 in the current adjustment and sampling module 20 can be composed of an operational amplifier. The negative feedback circuit 22 can adjust the conduction degree of the adjustment transistor 21 based on the target constant current value and / or the current value of the LED light source 300 to keep the current constant. In the embodiments of the present application, the conduction degree of the adjustment transistor 21 is adjusted by using the target constant current value and the current value of the LED light source 300 to keep the current constant. Among them, the target constant current value can be the current value input by the user through the communication interface or the input interface 52 of the control module 50 to perform constant current setting on the current in the negative feedback circuit 22, or it can be the current value flowing into the adjustment transistor 21 after the controller 51 adjusts the digital control constant voltage power supply module 10.

[0041] It should be noted that the adjustment transistor 21 in the embodiments of the present application can be a bipolar transistor or a MOS transistor. And in the embodiments of the present application, the current of the LED light source 300 in the working state is sampled by the current sampling circuit 23, and the sampling result is sent to the control module 50 through the negative feedback circuit 22. Among them, the current sampling circuit 23 generally uses a non-inductive sampling resistor or a Hall current sensor.

[0042] Further, as Figure 3 shown, the light source detection module 30 includes: a differential amplifier; the first output end of the current adjustment and sampling module 20 is connected to the first input end of the differential amplifier through the positive electrode of the LED light source 300; the first output end of the current adjustment and sampling module 20 is connected to the second input end of the differential amplifier through the negative electrode of the LED light source 300; the light source detection module 30 is connected to the input end of the analog-to-digital conversion module 40 through the output end of the differential amplifier;

[0043] The differential amplifier is used to amplify the differential mode signal of the LED light source 300. The light source detection module 30 is used to detect the amplified differential mode signal of the LED light source 300 to obtain a detection result, and send the detection result to the analog-to-digital conversion module 40; the detection result is an analog signal.

[0044] Further, as Figure 4 shown, the analog-to-digital conversion module 40 includes: a second chip; the analog-to-digital conversion module 40 is connected to the LED light source 300 through the input pin of the second chip; the analog-to-digital conversion module 40 is connected to the second input end of the control module 50 through the output pin of the second chip.

[0045] The second chip is used to convert the detection result from an analog signal into a digital signal, and send the obtained digital detection result after conversion to the regulation module 50.

[0046] Furthermore, the regulation module 50 includes: a controller 51; the regulation module 50 receives the digital detection result and the sampling result through the receiving end of the controller 51; the regulation module 50 sends a regulation electrical signal to the numerically controlled constant voltage power supply module 10 through the sending end of the controller 51.

[0047] Furthermore, the regulation module 50 further includes a communication interface or an input interface 52; the regulation module 50 is further configured to: the communication interface or the input interface 52 receives the regulation parameters input by the user and sends the regulation parameters to the controller 51; the regulation parameters include a target constant current value and a target constant voltage value; the controller 51 generates a regulation electrical signal in response to the regulation parameters and sends the regulation electrical signal to the numerically controlled constant voltage power supply module 10.

[0048] Combined with the above embodiments, it can be understood that a closed-loop constant voltage regulation mechanism for the LED light source 300 is formed by the numerically controlled constant voltage power supply module 10, the current adjustment and sampling module 20, the light source detection module 30, the analog-to-digital conversion module 40, and the regulation module 50, ensuring that a constant current can be provided for the LED light source 300 under any working conditions, avoiding the risk of brightness change or damage of the LED light source 300 caused by current fluctuation, thereby prolonging the service life of the LED light source 300 and ensuring the consistent light output quality of the LED light source 300; through the closed-loop constant voltage regulation mechanism of the LED light source 300, the utilization efficiency of the external constant voltage power supply 200 by the LED light source 300 can be precisely controlled and optimized, reducing unnecessary energy loss and maintaining the efficient operation of the LED light source 300; and the closed-loop constant voltage regulation mechanism of the LED light source 300 enables users to adapt to different specifications of the LED light source 300 without manual adjustment, improving the user experience.

[0049] On the other hand, based on the same inventive concept, the embodiments of the present application further provide an LED constant current light source driving method for implementing the above-mentioned LED constant current light source driver. The solution provided by the LED constant current light source driving method to solve the problem is similar to the solution described in the above method. Therefore, the specific limitations in the embodiments of the LED constant current light source driving method provided below can refer to the limitations on the LED constant current light source driver in the above text, and will not be repeated here.

[0050] In an exemplary embodiment, as Figure 5 shown, an LED constant current light source driving method is provided. The LED constant current light source driving method includes the following steps S510 to step S550, specifically:

[0051] Step S510: The numerically controlled constant voltage power supply module responds to the regulation electrical signal sent by the regulation module and provides a stable and adjustable voltage source for the current adjustment and sampling module.

[0052] Step S520: The current adjustment and sampling module adjusts the conduction degree based on the voltage source output by the numerically controlled constant voltage power supply module to keep the current constant, so that the LED light source works; and samples the current of the LED light source in the working state and sends the sampling result to the regulation module.

[0053] Step S530: The light source detection module detects the voltage of the LED light source in the working state and sends the detection result to the analog-to-digital conversion module.

[0054] Step S540: The analog-to-digital conversion module converts the detection result into a digital detection result and sends the digital detection result to the regulation module.

[0055] Step S550: The regulation module generates a regulation electrical signal based on the sampling result, the digital detection result, and the LED light source voltage, and sends the regulation electrical signal to the numerically controlled constant voltage power supply module.

[0056] As an optional implementation manner, the above-mentioned step S510 specifically includes: The digital potentiometer and the first chip combine to dynamically adjust the resistance value of the digital potentiometer based on the regulation electrical signal to offset the voltage of the external constant voltage power supply and provide a stable and adjustable voltage source for the current adjustment and sampling module.

[0057] As an optional implementation manner, the above-mentioned step S520 specifically includes: The negative feedback circuit adjusts the conduction degree of the adjustment tube based on the target constant current value and / or the LED light source current value to keep the current constant.

[0058] As an optional implementation manner, the above-mentioned step S520 also specifically includes: The current sampling circuit samples the current of the LED light source in the working state and sends the sampling result to the regulation module through the negative feedback circuit.

[0059] As an optional implementation manner, the above-mentioned step S530 specifically includes: The differential amplifier amplifies the differential mode signal of the LED light source, the light source detection module detects the amplified differential mode signal of the LED light source to obtain the detection result, and sends the detection result to the analog-to-digital conversion module; the detection result is an analog signal.

[0060] As an optional implementation manner, the above-mentioned step S540 specifically includes: The second chip converts the detection result from an analog signal into a digital signal and sends the obtained digital detection result after conversion to the regulation module.

[0061] As an alternative implementation manner, the above step S550 specifically includes: the regulation module receives the digital detection result and the sampling result through the receiving end of the controller; the regulation module sends a regulation electrical signal to the numerically controlled constant voltage power supply module through the sending end of the controller.

[0062] As an alternative implementation manner, the above step S550 further specifically includes: the communication interface or the input interface receives the regulation parameter input by the user and sends the regulation parameter to the controller; the controller generates a regulation electrical signal in response to the regulation parameter and sends the regulation electrical signal to the numerically controlled constant voltage power supply module.

[0063] When the present application implements the above step S510 to step S550, the numerically controlled constant voltage power supply module receives and responds to the regulation electrical signal sent by the regulation module, and provides a stable and voltage-adjustable voltage source for the current adjustment and sampling module; the current adjustment and sampling module adjusts the conduction degree through the target constant current value and the LED light source current value to keep the current constant, so that the LED light source works, and samples the current of the LED light source in the working state and sends the sampling result to the regulation module; the analog-to-digital conversion module receives the detection result, converts the detection result into a digital detection result and sends the digital detection result to the regulation module; the regulation module generates a regulation electrical signal according to the received sampling result, digital detection result and the LED light source voltage, and sends the regulation electrical signal to the numerically controlled constant voltage power supply module. Compared with the prior art, it no longer depends on an externally provided matching constant voltage power supply, and can automatically adjust the output voltage according to the voltage of the LED light source to adapt to the voltage requirements of different LED light sources, effectively meeting the voltage regulation requirements in a large range and realizing the closed-loop regulation of the voltage of the LED light source.

[0064] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0065] In this article, specific examples are used to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those of ordinary skill in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A LED constant current light source driver, characterized in that: The LED constant current light source driver comprises: a digitally controlled constant voltage power supply module, a current adjustment sampling module, a light source detection module, an analog digital conversion module, and a control module; The first input end of the digitally controlled constant voltage power supply module is connected to an external constant voltage power supply, the output end of the digitally controlled constant voltage power supply module is connected to the input end of the current adjustment sampling module, the first output end of the current adjustment sampling module is connected to the input end of the light source detection module through an LED light source, the second output end of the current adjustment sampling module is connected to the first input end of the control module, the output end of the light source detection module is connected to the input end of the analog-to-digital conversion module, the output end of the analog-to-digital conversion module is connected to the second input end of the control module, and the output end of the control module is connected to the second input end of the digitally controlled constant voltage power supply module; Wherein, the digitally controlled constant voltage power supply module is used to respond to the control electrical signal sent by the control module to provide a stable and adjustable voltage source for the current adjustment sampling module; The current adjustment sampling module is used to adjust the conduction degree based on the target constant current value and the current value of the LED light source to keep the current constant so that the LED light source works; and is used to sample the current of the LED light source in the working state and send the sampling result to the control module; The light source detection module is used to detect the voltage of the LED light source in a working state, and send the detection result to the analog-to-digital conversion module; The analog-to-digital conversion module is used to convert the detection result into a digital detection result, and send the digital detection result to the control module; The control module is used to generate the control electrical signal based on the sampling result, the digital detection result and the LED light source voltage, and send the control electrical signal to the digital control constant voltage power supply module.

2. The LED constant current light source driver according to claim 1, characterized in that: The digital controlled constant voltage power supply module comprises: a first chip and a digital potentiometer; The first chip includes a first input pin, a second input pin and an output pin; The digital potentiometer is connected to the second input pin; The digital controlled constant voltage power supply module is connected to an external constant voltage power supply via the first input pin; The digitally controlled constant voltage power supply module is connected to the control module via the second input pin and the digital potentiometer; The digital controlled constant voltage power supply module is connected to the current adjustment sampling module via the output pin; The digital potentiometer and the first chip are combined to dynamically adjust the resistance value of the digital potentiometer based on the control electrical signal to offset the voltage of the external constant voltage power supply and provide a stable and adjustable voltage source for the current adjustment sampling module.

3. The LED constant current light source driver according to claim 1, characterized in that: The current adjustment sampling module comprises: an adjustment tube and a negative feedback circuit; The current adjustment sampling module is connected to the digital control constant voltage power supply module through the first input end of the adjustment tube; The current adjustment sampling module is connected to the LED light source through the output end of the adjustment tube; The input end of the negative feedback circuit is connected to the output end of the adjustment tube; The first output terminal of the negative feedback circuit is connected to the second input terminal of the adjustment tube; The current adjustment sampling module is connected to the first input end of the control module through the second output end of the feedback circuit; Wherein, the negative feedback circuit is used to adjust the conduction degree of the adjustment tube based on the target constant current value and / or the LED light source current value to keep the current constant.

4. The LED constant current light source driver according to claim 3, characterized in that: The current adjustment sampling module also includes: a current sampling circuit; The input end of the current sampling circuit is connected to the output end of the adjustment tube; The current adjustment sampling module is connected to the LED light source through the first output end of the current sampling circuit; The input end of the negative feedback circuit is connected to the output end of the adjustment tube through the second output end of the current sampling circuit; The current sampling circuit is used to sample the current of the LED light source in a working state, and send the sampling result to the control module through the negative feedback circuit.

5. The LED constant current light source driver according to claim 4, characterized in that: The light source detection module includes: a differential amplifier; The first output end of the current adjustment sampling module is connected to the first input end of the differential amplifier through the positive electrode of the LED light source; the first output end of the current adjustment sampling module is connected to the second input end of the differential amplifier through the negative electrode of the LED light source; the light source detection module is connected to the input end of the analog-to-digital conversion module through the output end of the differential amplifier; Among them, the differential amplifier is used to amplify the differential signal of the LED light source, and the light source detection module is used to detect the amplified differential signal of the LED light source to obtain a detection result, and send the detection result to the analog-to-digital conversion module; the detection result is an analog signal.

6. The LED constant current light source driver according to claim 1, characterized in that: The analog-to-digital conversion module includes: a second chip; The analog-to-digital conversion module is connected to the LED light source via the input pin of the second chip; the analog-to-digital conversion module is connected to the second input end of the control module via the output pin of the second chip; The second chip is used to convert the detection result from an analog signal into a digital signal, and send the digital detection result obtained after the conversion to the control module.

7. The LED constant current light source driver according to claim 1, characterized in that: The control module includes: a controller; The control module receives the digital detection result and the sampling result through the receiving end of the controller; the control module sends the control electrical signal to the digital control constant voltage power supply module through the sending end of the controller.

8. The LED constant current light source driver according to claim 7, characterized in that: The control module also includes a communication interface or an input interface; The control module is also used for: The communication interface or the input interface receives the control parameters input by the user, and sends the control parameters to the controller; the control parameters include the target constant current value and the target constant voltage value; The controller generates the control electrical signal in response to the control parameter, and sends the control electrical signal to the digitally controlled constant voltage power supply module.

9. A method for driving a LED constant current light source, characterized in that: Applicable to the LED constant current light source driver according to any one of claims 1 to 8, the LED constant current light source driving method comprising: The digitally controlled constant voltage power supply module responds to the control electrical signal sent by the control module to provide a stable and adjustable voltage source for the current adjustment sampling module; The current adjustment sampling module adjusts the conduction degree based on the voltage source output by the digital control constant voltage power supply module to keep the current constant so that the LED light source works; and samples the current of the LED light source in the working state and sends the sampling result to the control module; The light source detection module detects the voltage of the LED light source in a working state, and sends the detection result to the analog-to-digital conversion module; The analog-to-digital conversion module converts the detection result into a digital detection result, and sends the digital detection result to the control module; The control module generates the control electrical signal based on the sampling result, the digital detection result and the LED light source voltage, and sends the control electrical signal to the digital control constant voltage power supply module.

10. The LED constant current light source driving method according to claim 9, characterized in that: The method further comprises: The communication interface or the input interface receives the control parameters input by the user and sends the control parameters to the controller; The controller generates the control electrical signal in response to the control parameter, and sends the control electrical signal to the digitally controlled constant voltage power supply module.

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