WRGB dimming LED lamp string driver, LED lamp string and Christmas tree

Abstract

The utility model relates to a WRGB dimming LED lamp string driver, an LED lamp string and a Christmas tree. The driver comprises a shell and a control panel installed in the shell. The two ends of the control panel are provided with a power supply end used for being externally connected with a DC power source and a lamp string connecting end used for being externally connected with the lamp string body. A circuit is arranged on the control panel and comprises a control signal receiving module, a main control chip and an LED driving module; the control signal receiving module is used for receiving a control signal and sending the control signal to the main control chip; the main control chip generates a first PWM signal, a second PWM signal and a third PWM signal for controlling an LED driving module according to the control signal; and the LED driving module respectively drives a red light emitting unit, a green light emitting unit and a blue light emitting unit of the lamp string body according to the first PWM signal, the second PWM signal and the third PWM signal. The LED lamp string has a WRGB stepless dimming and color adjusting function, so that the light emitting effect of the lamp string is more gorgeous, and the user experience is improved.

Description

Technical Field

[0001] The utility model relates to the field of LED lamps, in particular to an LED lamp string driver, an LED lamp string and a Christmas tree. Background Art

[0002] During Christmas, it is a traditional custom in many Western countries to decorate houses or yards with Christmas trees. In modern urban families, people usually use artificial Christmas tree products to replace traditional natural trees as Christmas trees. There is a kind of artificial Christmas tree product sold on the market, which is equipped with an LED lamp string. When in use, the equipped LED lamp string is wound around the Christmas tree, and the LED lamp string is powered on to emit light, achieving the effect of decorating the Christmas tree.

[0003] In some existing LED lamp string products, the LED lamp string body is connected to a power supply through a driver, and the driver can control the LED lamp string to achieve a richer lighting effect. However, the drivers of existing Christmas tree LED lamp strings are usually integrally connected to the lamp string body and the power supply. When a user decorates a Christmas tree, they need to wind the LED lamp string connected to the driver layer by layer around the Christmas tree body; and the driver is relatively heavy, which is inconvenient for the user to wind the LED lamp string and the installation experience is not good. Moreover, the drivers of existing Christmas tree LED lamp strings do not have the function of WRGB stepless dimming and color mixing, and the LED lamp string can only emit light of a fixed color and fixed brightness, resulting in a poor user experience. Summary of the Utility Model

[0004] Based on this, the purpose of the utility model is to provide a WRGB dimming LED lamp string driver, an LED lamp string and a Christmas tree, which have the advantages of convenient installation, capable of realizing WRGB stepless dimming, and better user experience.

[0005] The utility model provides a WRGB dimming LED lamp string driver, including: a housing and a control board installed inside the housing; both ends of the control board are provided with a power supply terminal for externally connecting a DC power supply and a lamp string connection terminal for externally connecting a lamp string body; the control board is provided with a circuit, which includes a control signal receiving module, a main control chip and an LED driving module; the control signal receiving module is used to receive a control signal and send the control signal to the main control chip; the main control chip generates a first PWM signal, a second PMW signal and a third PWM signal for controlling the LED driving module according to the control signal; the LED driving module is provided with a first output terminal for externally connecting a red light emitting unit of the lamp string body, a second output terminal for externally connecting a green light emitting unit of the lamp string body and a third output terminal for externally connecting a blue light emitting unit of the lamp string body; the LED driving module drives the red light emitting unit, the green light emitting unit and the blue light emitting unit of the lamp string body respectively according to the first PWM signal, the second PMW signal and the third PWM signal.

[0006] The utility model has the following technical effects: 1. The driver is separated from the LED light string body and is connected through the wiring terminal when in use. When users decorate the Christmas tree, they can first wrap the lightweight LED light string body around the Christmas tree, and then connect the LED light string body and the driver, thereby improving the installation experience. 2. The driver has the WRGB stepless dimming and color adjustment function, which can drive the LED light string to emit light of any color and brightness, making the light string light effect more gorgeous and improving the user experience.

[0007] Furthermore, the control signal receiving module includes a remote control control unit connected to the main control chip; the control signal includes a remote control signal; the remote control control unit receives a radio frequency signal generated by a user operating a remote control, demodulates the radio frequency signal to obtain a remote control signal, and finally outputs the remote control signal to the main control chip; the main control chip generates a PWM signal for controlling the LED driving module according to the remote control signal.

[0008] Furthermore, the control panel is also provided with a button; the control signal receiving module also includes a button control unit; the control signal also includes a button signal; the button control unit obtains the button signal generated by the user triggering the button, and outputs the button signal to the main control chip; the main control chip generates a PWM signal for controlling the LED driving module according to the button signal.

[0009] Furthermore, the circuit of the control board also includes a power supply voltage stabilizing module; the power supply voltage stabilizing module is used to connect to an external DC power supply and convert the DC power supply into a stable first voltage and a second voltage, thereby supplying power to other modules of the circuit.

[0010] Further, the power supply voltage stabilization module includes a first voltage stabilization unit and a second voltage stabilization unit; the first voltage stabilization unit includes: a voltage stabilization chip, a first capacitor, a first diode, and a second capacitor; the input terminal of the voltage stabilization chip is used to externally connect a DC power supply, the output terminal outputs a first voltage, and the ground terminal is grounded; the first capacitor is connected in parallel between the input terminal and the ground terminal of the voltage stabilization chip; the cathode of the first diode is externally connected to the DC power supply, and the anode is grounded; the second capacitor is connected in parallel between the output terminal and the ground terminal of the voltage stabilization chip; the second voltage stabilization unit includes: a triode, a first resistor, a second resistor, a three-terminal voltage stabilization tube, a third resistor, a fourth resistor, and a third capacitor; the collector of the triode is externally connected to the DC power supply through the first resistor, the base is connected to its own collector through the second resistor, and the emitter is the second voltage output terminal; the first terminal of the three-terminal voltage stabilization tube is connected to the emitter of the triode through the third resistor, the second terminal is connected to the base of the triode, and the third terminal is grounded; the fourth resistor is connected in parallel between the first terminal and the third terminal of the three-terminal voltage stabilization tube; one end of the third capacitor is connected to the emitter of the triode, and the other end is grounded.

[0011] Further, the remote control unit includes: a radio frequency receiving chip, a fourth capacitor, an antenna, a crystal oscillator, a fifth resistor, a fifth capacitor, and a sixth resistor; the radio frequency signal receiving terminal of the radio frequency receiving chip is connected to the antenna through the fourth capacitor for receiving the radio frequency signal sent by the remote controller; the radio frequency receiving chip converts the radio frequency signal into a remote control signal through a preset demodulation program and outputs the remote control signal to the main control chip through its output terminal; one end of the crystal oscillator is connected to the clock input terminal of the radio frequency receiving chip, and the other end is grounded; the power supply input terminal of the radio frequency receiving chip is connected to the first voltage through the fifth resistor; the fifth capacitor is connected in parallel between the ground terminal and the power supply input terminal of the radio frequency receiving chip; one end of the sixth resistor is connected to the radio frequency signal receiving terminal of the radio frequency receiving chip, and the other end is grounded.

[0012] Further, the LED driving module includes a red light driving unit; the red light driving unit includes a first MOS transistor, a seventh resistor, a second diode, an eighth resistor, and a sixth capacitor; the first MOS transistor is a P-channel MOS transistor, its gate is connected to the first PWM signal output by the main control chip through the seventh resistor, the source is externally connected to the DC power supply, and the drain is the first output terminal of the red light emitting unit of the externally connected lamp string body; the anode of the second diode is connected to the second voltage, and the cathode is connected to the drain of the first MOS transistor; the eighth resistor is connected in parallel between the gate and the source of the first MOS transistor; one end of the sixth capacitor is connected to the gate of the first MOS transistor, and the other end is grounded.

[0013] Further, the LED driving module further includes a green light driving unit and a blue light driving unit; the green light driving unit includes a second MOS transistor, a ninth resistor, a third diode, and a tenth resistor; the second MOS transistor is a P-channel MOS transistor, whose gate is connected to the second PWM signal output by the main control chip through the ninth resistor, the source is externally connected to a DC power supply, and the drain is the second output terminal of the green light emitting unit externally connected to the lamp string body; the anode of the third diode is connected to the second voltage, and the cathode is connected to the drain of the second MOS transistor; the tenth resistor is connected across the gate and the source of the second MOS transistor; the blue light driving unit includes a third MOS transistor, an eleventh resistor, a fourth diode, and a twelfth resistor; the third MOS transistor is also a P-channel MOS transistor, whose gate is connected to the third PWM signal output by the main control chip through the eleventh resistor, the source is externally connected to a DC power supply, and the drain is the third output terminal of the blue light emitting unit externally connected to the lamp string body; the anode of the fourth diode is connected to the second voltage V2, and the cathode is connected to the drain of the third MOS transistor; the twelfth resistor is connected across the gate and the source of the third MOS transistor.

[0014] Based on the same inventive concept, the present utility model further provides an LED lamp string, including: a lamp string body and any one of the above-mentioned WRGB dimming LED lamp string drivers; the input end of the driver is externally connected to a DC power supply, and the output end is connected to the lamp string body to drive the lamp string body to emit light.

[0015] Based on the same inventive concept, the present utility model further provides a Christmas tree, including: a Christmas tree body and an LED lamp string wound around the Christmas tree body; the LED lamp string includes a lamp string body and any one of the above-mentioned WRGB dimming LED lamp string drivers; the input end of the driver is externally connected to a DC power supply, and the output end is connected to the lamp string body to drive the lamp string body to emit light.

[0016] For better understanding and implementation, the present utility model will be described in detail below with reference to the accompanying drawings. Description of the Drawings

[0017] Figure 1 Schematic diagram of the Christmas tree according to Embodiment 1 of the present utility model;

[0018] Figure 2 Schematic diagram of the structure of the WRGB dimming LED lamp string driver according to Embodiment 1 of the present utility model;

[0019] Figure 3 Schematic diagram of the module of the circuit of the control board of the WRGB dimming LED lamp string driver according to Embodiment 1 of the present utility model;

[0020] Figure 4 Schematic diagram of the structure of the WRGB dimming LED lamp string driver according to Embodiment 2 of the present utility model;

[0021] Figure 5 This is a schematic diagram of the specific structure of the circuit of the control board of the LED string driver according to Embodiment 3 of the present utility model. Detailed implementation manners

[0022] It should be clear that the described embodiments are only a part of the embodiments of the present application, rather than all of them. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope protected by the embodiments of the present application.

[0023] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the embodiments of the present application. The singular forms "a", "the", and "said" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0024] When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims. In the description of the present application, it should be understood that the terms "first", "second", "third", etc. are only used to distinguish similar objects, and do not have to be used to describe a specific order or sequence, nor can they be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0025] In addition, in the description of the present application, unless otherwise specified, "a plurality of" and "several" mean two or more. "And / or" describes the associated relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after.

[0026] Example 1

[0027] Please refer to Figure 1 , Figure 1Schematic diagram of the Christmas tree of the present utility model. The Christmas tree of the present utility model includes a Christmas tree body 1 and an LED light string 2 wound around the Christmas tree body 1. The LED light string 2 is the LED light string of the present utility model. The LED light string 2 includes a light string body 21 and a driver 22. The input end of the driver 22 is used to connect to an external DC power supply, and the output end is connected to the light string body 21 through a terminal to drive the light string body 21 to emit light. The driver 22 is the WRGB dimming LED light string driver of the present utility model.

[0028] From Figure 1 It can be seen that the driver 22 of the present utility model is separated from the light string body 21, and the output end of the driver 22 and the input end of the light string body 21 are connected through a terminal only during use. When the user arranges the Christmas tree, the relatively light light string body 21 can be wound around the Christmas tree body 1 first, and finally the light string body 21 and the driver 22 are connected, thus improving the installation experience.

[0029] Please refer to Figure 2 , Figure 2 Schematic diagram of the structure of the WRGB dimming LED light string driver according to Embodiment 1 of the present utility model. The driver 22 includes: a housing 221 and a control board 222.

[0030] The housing 221 includes an upper housing 2211 and a lower housing 2212. The upper housing 2211 and the lower housing 2212 are fixedly connected by buckles to form a housing 221 with an internal cavity.

[0031] The control board 222 is installed inside the housing 221, and both ends thereof are provided with a power supply terminal 222a for connecting to a DC power supply and a light string connection terminal 222b for connecting to the light string body 21.

[0032] Please refer to Figure 3 , Figure 3 Schematic diagram of the circuit modules of the control board of the WRGB dimming LED light string driver according to Embodiment 1 of the present utility model. The circuit E of the control board 222 of the driver 22 includes: a power supply voltage stabilization module E1, a control signal receiving module E2, a main control chip MCU, and an LED driving module E3.

[0033] The power supply voltage stabilization module E1 is used to convert the DC power supply into a stable first voltage V1 and a second voltage V2 to supply power to other modules.

[0034] The control signal receiving module E2 is used to receive a control signal and send the control signal to the main control chip MCU. The main control chip MCU generates a PWM signal for controlling the LED driving module according to the control signal.

[0035] Specifically, the control signal includes a remote control signal; the control signal receiving module E2 includes a remote control unit E21 connected to the main control chip MCU. The remote control unit E21 receives the radio frequency signal based on radio waves generated by the user operating the remote control, demodulates the radio frequency signal to obtain a remote control signal, and finally outputs the remote control signal to the main control chip MCU. The main control chip MCU generates a PWM signal for controlling the LED driving module according to the remote control signal.

[0036] The input end of the LED driving module E3 is connected to the PWM signal output by the main control chip MCU, and the output end is connected to the lamp string body 21; the LED driving module E3 drives the lamp string body 21 to emit light according to the PWM signal.

[0037] Further, the PWM signal output by the main control chip MCU includes a first PWM signal, a second PWM signal, and a third PWM signal; the output end of the LED driving module E3 includes a first output end OUT1, a second output end OUT2, and a third output end OUT3. The lamp string body 21 includes a red light emitting unit connected to the first output end OUT1 of the LED driving module E3, a green light emitting unit connected to the second output end OUT2 of the LED driving module E3, and a blue light emitting unit connected to the third output end OUT3 of the LED driving module E3.

[0038] The first PWM signal output by the main control chip MCU controls the current output by the first output end OUT1 of the LED driving module E3, and further controls the red light emitted by the red light emitting unit of the lamp string body; the second PWM signal output by the main control chip MCU controls the current output by the second output end OUT2 of the LED driving module E3, and further controls the green light emitted by the green light emitting unit of the lamp string body; the third PWM signal output by the main control chip MCU controls the current output by the third output end OUT3 of the LED driving module E3, and further controls the blue light emitted by the blue light emitting unit of the lamp string body. Since red light, green light, and blue light can synthesize light of any color and any brightness, the main control chip MCU can control the lamp string body to emit light of any color and any brightness by controlling the first PWM signal, the second PWM signal, and the third PWM signal, thereby realizing WRGB stepless dimming and color adjustment.

[0039] In Figure 2In the illustrated embodiment, a driver has three lamp string connection terminals 222b for connecting the lamp string body 21, denoted as the first lamp string connection terminal 222b1, the second lamp string connection terminal 222b2, and the third lamp string connection terminal 222b3 respectively. The number of the LED driving modules E3 is also three, denoted as the first LED driving module, the second LED driving module, and the third LED driving module respectively. The first LED driving module, the second LED driving module, and the third LED driving module are respectively controlled by three PWM signals issued by the main control chip MCU, and respectively drive Figure 1 the first lamp string body 211, the second lamp string body 212, and the third lamp string body 213 shown. That is to say, the main control chip MCU outputs a total of nine PWM signals, and every three PWM signals drive a lamp string body to realize WRGB stepless dimming and color mixing, achieving a richer and more hierarchical light-emitting effect.

[0040] Example 2

[0041] Please refer to Figure 4 , Figure 4 which is a schematic structural diagram of the WRGB dimming LED lamp string driver according to Embodiment 2 of the present utility model. In this embodiment, an installation hole for installing the button 222c is provided on the upper shell 2211 of the outer shell 221; the control board 222 is provided with the button 222c; the button 222c protrudes from the installation hole of the outer shell. The control signal further includes a button signal. The control signal receiving module E2 of the circuit E on the control board 222 further includes: a button control unit E22 connected to the main control chip MCU. The button control unit E22 is connected to the button 222c on the control board 222. When the user triggers the button 222c, the button control unit E22 acquires and outputs a button signal to the main control chip MCU. The main control chip MCU generates a PWM signal for controlling the LED driving module according to the button signal.

[0042] Example 3

[0043] Please refer to Figure 5 , Figure 5 which is a specific schematic structural diagram of the circuit of the control board of the LED lamp string driver according to Embodiment 3 of the present utility model.

[0044] Specifically, the power supply voltage stabilization module E1 includes: a first voltage stabilization unit E11 and a second voltage stabilization unit E12. The first voltage stabilization unit E11 is used to convert the external DC power supply VCC into a first voltage V1. The second voltage stabilization unit E12 is used to convert the external DC power supply VCC into a second voltage V2.

[0045] The specific voltage value of the external DC power supply VCC is between 3V and 36V; the specific voltage values of the first voltage V1 and the second voltage V2 are set according to actual needs. In this embodiment, the external DC power supply VCC is a +5.5V power supply, the first voltage V1 is +5V, and the second voltage V2 is +2V.

[0046] The first voltage stabilization unit E11 includes: a voltage stabilization chip U1, a first capacitor C1, a first diode D1, and a second capacitor C2. The input terminal VIN of the voltage stabilization chip U1 is used to connect to the external DC power supply VCC (+5.5V power supply), the output terminal VOUT outputs the first voltage V1 (+5V power supply), and the ground terminal GND is grounded. The first capacitor C1 is connected across the input terminal and the ground terminal of the voltage stabilization chip U1. The cathode of the first diode D1 is connected to the external DC power supply VCC (+5.5V power supply), and the anode is grounded. The second capacitor C2 is connected across the output terminal VOUT and the ground terminal GND of the voltage stabilization chip U1. The first capacitor C1, the first diode D1, and the second capacitor C2 all play a role in voltage stabilization and circuit protection.

[0047] The second voltage stabilization unit E12 includes: a triode Q1, a first resistor R1, a second resistor R2, a three-terminal voltage regulator Z1, a third resistor R3, a fourth resistor R4, and a third capacitor C3. The collector of the triode Q1 is connected to the external DC power supply VCC (+5.5V power supply) through the first resistor R1, the base is connected to its own collector through the second resistor R2, and the emitter is the output terminal of the second voltage V2 (+2V power supply). The first terminal of the three-terminal voltage regulator Z1 is connected to the emitter of the triode Q1 through the third resistor R3, the second terminal (cathode) is connected to the base of the triode Q1, and the third terminal (anode) is grounded. The fourth resistor R4 is connected across the first terminal and the third terminal of the three-terminal voltage regulator Z1. One end of the third capacitor C3 is connected to the emitter of the triode Q1, and the other end is grounded.

[0048] Specifically, the control signal receiving module E2 includes a remote control unit E21 and a key control unit E22.

[0049] The key control unit E22 is used to receive the key signal KEY generated by the user triggering the key 222c and output the key signal KEY to the main control chip MCU.

[0050] The remote control unit E21 includes: a radio frequency receiving chip U2, a fourth capacitor C4, an antenna ANT, a crystal oscillator Y1, a fifth resistor R5, a fifth capacitor C5, and a sixth resistor R6. The radio frequency signal receiving end RFIN of the radio frequency receiving chip U2 is connected to the antenna ANT through the fourth capacitor C4 for receiving the radio frequency signal sent by the remote controller. The radio frequency receiving chip U2 converts the radio frequency signal into a remote control signal through a preset demodulation program, and outputs the remote control signal to the main control chip MCU through its output end DOUT.

[0051] In this embodiment, the model of the radio frequency receiving chip is CMT2210LB. Its pin 1 and pin 2 are floating, pin 3 is the output end DOUT connected to the main control chip MCU, pin 4 is the clock input end XIN connected to the crystal oscillator Y1, pin 5 is the radio frequency signal receiving end RFIN connected to the antenna ANT, pin 6 is the grounding end GND, pin 7 is the power supply input end VDD, and pin 8 is floating. One end of the crystal oscillator Y1 is connected to the clock input end XIN of the radio frequency receiving chip, and the other end is grounded. The power supply input end VDD of the radio frequency receiving chip U2 is connected to the first voltage V1 (+5V power supply) through the fifth resistor R5. The fifth capacitor C5 is connected across the grounding end GND and the power supply input end VDD of the radio frequency receiving chip. One end of the sixth resistor R6 is connected to the radio frequency signal receiving end RFIN of the radio frequency receiving chip, and the other end is grounded.

[0052] Specifically, the main control chip MCU is provided with a program burning end, a power supply input end, a key signal input end, a remote control signal input end, and a PWM signal output end. The program burning end is used to connect to an external upper computer to burn a preset program. The power supply input end is connected to the first voltage V1 output by the power supply voltage stabilization module E1. The key signal input end is connected to the key signal KEY output by the key control unit E22. The remote control signal input end is connected to the remote control signal output by the radio frequency receiving chip U2 of the remote control unit E21. The main control chip MCU generates a PWM signal for controlling the LED driving module E3 according to the key signal and / or the remote control signal through a preset program inside it.

[0053] Specifically, the structures of the first LED driving module, the second LED driving module, and the third LED driving module are the same, and each includes a red light driving unit, a green light driving unit, and a blue light driving unit.

[0054] The red light driving unit includes a first MOS transistor MOS1, a seventh resistor R7, a second diode D2, an eighth resistor R8, and a sixth capacitor C6. The first MOS transistor MOS1 is a P-channel MOS transistor. Its gate is connected to the first PWM signal PWM1 output by the main control chip MCU through the seventh resistor R7. Its source is connected to an external DC power supply VCC (+5.5V power supply). Its drain is connected to the first output terminal OUT1 of the red light emitting unit of the lamp string body. The anode of the second diode D2 is connected to the second voltage V2 output by the second voltage stabilizing unit E12, and the cathode is connected to the drain of the first MOS transistor MOS1. The eighth resistor R8 is connected across the gate and the source of the first MOS transistor MOS1. One end of the sixth capacitor C6 is connected to the gate of the first MOS transistor MOS1, and the other end is grounded.

[0055] The green light driving unit includes a second MOS transistor MOS2, a ninth resistor R9, a third diode D3, and a tenth resistor R10. The second MOS transistor MOS2 is also a P-channel MOS transistor. Its gate is connected to the second PWM signal PWM2 output by the main control chip MCU through the ninth resistor R9. Its source is connected to an external DC power supply VCC (+5.5V power supply). Its drain is connected to the second output terminal OUT2 of the green light emitting unit of the lamp string body. The anode of the third diode D3 is connected to the second voltage V2 output by the second voltage stabilizing unit E12, and the cathode is connected to the drain of the second MOS transistor MOS2. The tenth resistor R10 is connected across the gate and the source of the second MOS transistor MOS2.

[0056] The blue light driving unit includes a third MOS transistor MOS3, an eleventh resistor R11, a fourth diode D4, and a twelfth resistor R12. The third MOS transistor MOS3 is also a P-channel MOS transistor. Its gate is connected to the third PWM signal PWM3 output by the main control chip MCU through the eleventh resistor R11. Its source is connected to an external DC power supply VCC (+5.5V power supply). Its drain is connected to the third output terminal OUT3 of the blue light emitting unit of the lamp string body. The anode of the fourth diode D4 is connected to the second voltage V2 output by the second voltage stabilizing unit, and the cathode is connected to the drain of the third MOS transistor MOS3. The twelfth resistor R12 is connected across the gate and the source of the third MOS transistor MOS3.

[0057] In this embodiment, the model of the main control chip MCU is 8S1K; the model of the voltage regulator chip U1 is 7550; the crystal oscillator Y1 is a 27M crystal oscillator; the model of the first diode D1, the second diode D2, the third diode D3 and the fourth diode D4 are all SS34; the model of the triode Q1 is D882; the model of the three-pin voltage regulator Z1 is TL432; the model of the first MOS tube MOS1, the second MOS tube MOS2, the third MOS tube MOS3 and the fourth MOS tube MOS4 are all 4435P channel MOS tubes. The specific parameters of other capacitors and resistors can be adjusted by those skilled in the art as needed, and the utility model does not specifically limit them.

[0058] The utility model has the following technical effects: 1. The driver is separated from the LED light string body and is connected through the wiring terminal when in use. When the user arranges the Christmas tree, the user can first wrap the lightweight LED light string body around the Christmas tree, and then connect the LED light string body to the driver, thereby improving the installation experience. 2. The driver has the WRGB stepless dimming and color adjustment function, which can drive the LED light string to emit light of any color and brightness, making the light string light effect more gorgeous and improving the user experience. 3. Users can control the light effect of the LED light string through two methods: button switch and remote control. It is suitable for a variety of operating scenarios and is more convenient to use.

[0059] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, and the utility model is also intended to include these modifications and modifications.

Claims

1. An LED string driver for WRGB dimming, characterized in that Comprising: A housing and a control board installed inside the housing; Both ends of the control board are provided with a power supply terminal for externally connecting a DC power supply and a lamp string connection terminal for externally connecting a lamp string body; A circuit is provided on the control board, which includes a control signal receiving module, a main control chip, and an LED driving module; The control signal receiving module is used to receive a control signal and send the control signal to the main control chip; The main control chip generates a first PWM signal, a second PMW signal, and a third PWM signal for controlling the LED driving module according to the control signal; The LED driving module is provided with a first output terminal for externally connecting a red light emitting unit of the lamp string body, a second output terminal for externally connecting a green light emitting unit of the lamp string body, and a third output terminal for externally connecting a blue light emitting unit of the lamp string body; The LED driving module drives the red light emitting unit, the green light emitting unit, and the blue light emitting unit of the lamp string body respectively according to the first PWM signal, the second PMW signal, and the third PWM signal.

2. The WRGB dimming LED lamp string driver according to claim 1, characterized in that: The control signal receiving module includes a remote control unit connected to the main control chip; the control signal includes a remote control signal; the remote control unit receives the radio frequency signal generated by the user operating the remote control, demodulates the radio frequency signal to obtain the remote control signal, and finally outputs the remote control signal to the main control chip; the main control chip generates a PWM signal for controlling the LED driving module according to the remote control signal.

3. The WRGB dimming LED lamp string driver according to claim 2, characterized in that: A key is further provided on the control board; the control signal receiving module further includes a key control unit; the control signal further includes a key signal; the key control unit obtains the key signal generated by the user triggering the key and outputs the key signal to the main control chip; the main control chip generates a PWM signal for controlling the LED driving module according to the key signal.

4. The WRGB dimming LED lamp string driver according to claim 3, characterized in that: The circuit of the control board further includes a power supply voltage stabilization module; the power supply voltage stabilization module is used to externally connect a DC power supply, convert the DC power supply into a stable first voltage and a second voltage, so as to supply power to other modules of the circuit.

5. The WRGB dimming LED lamp string driver according to claim 4, characterized in that: The power supply voltage stabilization module includes a first voltage stabilization unit and a second voltage stabilization unit; The first voltage stabilization unit includes: a voltage stabilization chip, a first capacitor, a first diode, and a second capacitor; the input terminal of the voltage stabilization chip is used to externally connect a DC power supply, the output terminal outputs a first voltage, and the grounding terminal is grounded; the first capacitor is connected in parallel between the input terminal and the grounding terminal of the voltage stabilization chip; the cathode of the first diode is externally connected to the DC power supply, and the anode is grounded; the second capacitor is connected in parallel between the output terminal and the grounding terminal of the voltage stabilization chip; The second voltage stabilizing unit includes: a triode, a first resistor, a second resistor, a three-terminal voltage regulator diode, a third resistor, a fourth resistor, and a third capacitor; the collector of the triode is externally connected to a DC power supply through the first resistor, the base is connected to its own collector through the second resistor, and the emitter is the second voltage output terminal; the first terminal of the three-terminal voltage regulator diode is connected to the emitter of the triode through the third resistor, the second terminal is connected to the base of the triode, and the third terminal is grounded; the fourth resistor is connected across the first terminal and the third terminal of the three-terminal voltage regulator diode; one end of the third capacitor is connected to the emitter of the triode, and the other end is grounded.

6. The WRGB dimming LED string driver according to claim 5, characterized in that: The remote control unit includes: a radio frequency receiving chip, a fourth capacitor, an antenna, a crystal oscillator, a fifth resistor, a fifth capacitor, and a sixth resistor; the radio frequency signal receiving end of the radio frequency receiving chip is connected to the antenna through the fourth capacitor for receiving the radio frequency signal sent by the remote control; the radio frequency receiving chip converts the radio frequency signal into a remote control signal through a preset demodulation program and outputs the remote control signal to the main control chip through its output end; one end of the crystal oscillator is connected to the clock input end of the radio frequency receiving chip, and the other end is grounded; the power supply input end of the radio frequency receiving chip is connected to the first voltage through the fifth resistor; the fifth capacitor is connected across the ground end and the power supply input end of the radio frequency receiving chip; one end of the sixth resistor is connected to the radio frequency signal receiving end of the radio frequency receiving chip, and the other end is grounded.

7. The WRGB dimming LED string driver according to claim 6, characterized in that: The LED driving module includes a red light driving unit; the red light driving unit includes a first MOS transistor, a seventh resistor, a second diode, an eighth resistor, and a sixth capacitor; the first MOS transistor is a P-channel MOS transistor, its gate is connected to the first PWM signal output by the main control chip through the seventh resistor, the source is externally connected to a DC power supply, and the drain is the first output end of the red light emitting unit of the externally connected lamp string body; the anode of the second diode is connected to the second voltage, and the cathode is connected to the drain of the first MOS transistor; the eighth resistor is connected across the gate and the source of the first MOS transistor; One end of the sixth capacitor is connected to the gate of the first MOS transistor, and the other end is grounded.

8. The WRGB dimming LED string driver according to claim 7, characterized in that: The LED driving module further includes a green light driving unit and a blue light driving unit; The green light driving unit includes a second MOS transistor, a ninth resistor, a third diode, and a tenth resistor; the second MOS transistor is a P-channel MOS transistor, its gate is connected to the second PWM signal output by the main control chip through the ninth resistor, the source is externally connected to a DC power supply, and the drain is the second output end of the green light emitting unit of the externally connected lamp string body; the anode of the third diode is connected to the second voltage, and the cathode is connected to the drain of the second MOS transistor; The tenth resistor is connected across the gate and the source of the second MOS transistor; The blue light driving unit includes a third MOS transistor, an eleventh resistor, a fourth diode, and a twelfth resistor; the third MOS transistor is also a P-channel MOS transistor, whose gate is connected to the third PWM signal output by the main control chip through the eleventh resistor, the source is externally connected to a DC power supply, and the drain is the third output terminal of the blue light emitting unit externally connected to the lamp string body; the anode of the fourth diode is connected to the second voltage V2, and the cathode is connected to the drain of the third MOS transistor; the twelfth resistor is connected across the gate and the source of the third MOS transistor.

9. An LED lamp string, characterized in that, Comprising: A lamp string body and the WRGB dimming LED lamp string driver according to any one of claims 1-8; The input end of the driver is externally connected to a DC power supply, and the output end is connected to the lamp string body to drive the lamp string body to emit light.

10. A Christmas tree, characterized in that, Comprising: A Christmas tree body and an LED lamp string wound around the Christmas tree body; The LED lamp string includes a lamp string body and the WRGB dimming LED lamp string driver according to any one of claims 1-8; the input end of the driver is externally connected to a DC power supply, and the output end is connected to the lamp string body to drive the lamp string body to emit light.

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