LED lamp string driver with music playing function, LED lamp string and Christmas tree

Abstract

The utility model relates to an LED lamp string driver with a music playing function, an LED lamp string and a Christmas tree. The driver comprises a shell, a control panel and a loudspeaker, wherein the control panel and the loudspeaker are arranged in the shell. The first surface of the shell is provided with a first hole and a second hole; the power supply end of the control panel is connected with an external DC power source through the first hole, and the output end of the control panel is connected with an external lamp string body through the second hole. The second surface of the shell is provided with a plurality of sound making grooves; the loudspeaker is installed on the side, close to the sound outlet groove, in the shell, and the sound outlet direction of the loudspeaker directly faces the sound outlet groove. And the loudspeaker is electrically connected with the control panel and plays music according to the audio modulation signal output by the control panel. The Christmas tree not only has an LED light-emitting function, but also integrates a music playing function, not only meets the requirement of a user for decorating the Christmas tree, but also can give the user a pleasure of enjoying music, has a better festival atmosphere rendering effect, and is more novel in user experience.

Description

Technical Field

[0001] The utility model relates to the field of LED lamps, in particular to an LED lamp string driver with a music playing function, 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 instead of 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 supporting 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 a music playing function, and the festival atmosphere rendering effect is not good. Summary of the Utility Model

[0004] Based on this, the purpose of the present utility model is to provide an LED lamp string driver with a music playing function, an LED lamp string and a Christmas tree, which not only has the function of the lamp string emitting light, but also integrates the music playing function, which not only meets the user's need to decorate the Christmas tree, but also gives the user the pleasure of enjoying music, has a better festival atmosphere rendering effect, and the user experience is more novel.

[0005] The present utility model provides an LED lamp string driver with a music playing function, comprising: a housing, and a control board and a speaker arranged inside the housing; a first hole and a second hole are provided on a first surface of the housing; a power supply end of the control board is connected to an external DC power supply through the first hole, and an output end of the control board is connected to an external lamp string body through the second hole; a plurality of sound emitting grooves are provided on a second surface of the housing; the speaker is installed inside the housing on a side close to the sound emitting grooves, and its sound emitting direction is directly opposite to the sound emitting grooves; the speaker is electrically connected to the control board and plays music according to an audio modulation signal output by the control board. The LED lamp string driver of the present utility model can not only drive the LED lamp string to emit light, but also has a music playing function, which not only meets the user's need to decorate the Christmas tree, but also gives the user the pleasure of enjoying music, has a better festival atmosphere rendering effect, and the user experience is more novel.

[0006] Further, the LED light string driver with music playback function further includes a keypad; a plurality of key caps are provided on the third side of the housing; the keypad is installed inside the housing on the side close to the key caps, and buttons are provided at positions corresponding to the key caps; the keypad is electrically connected to the control board; the keypad obtains the key signal generated when the button is pressed and transmits it to the control board.

[0007] Further, a circuit is provided on the control board; the circuit includes: a control signal receiving module, a main control chip, an LED driving module, and a power amplifier module; the control signal receiving module includes a key control unit, which is connected to the button on the keypad and is used to obtain and transmit the key signal to the main control chip; the main control chip controls the output of the PWM signal and / or the music modulation signal according to the key signal; the LED driving module is electrically connected to the light string body and drives the light string body to emit light according to the PWM signal; the power amplifier module is electrically connected to the speaker and plays music according to the music modulation signal.

[0008] Further, the circuit further includes: a USB module and a storage module; the USB module is used to connect to an external host computer, obtain the music data transmitted by the host computer, and transmit the music data to the main control chip; the main control chip processes the music data and then stores it in the storage module; when music needs to be played, the main control chip reads the music data in the storage module and generates a music modulation signal according to the music data.

[0009] Further, the circuit further includes a Bluetooth antenna; the Bluetooth antenna is electrically connected to the main control chip and is used to receive the Bluetooth signal sent by the host computer and transmit the Bluetooth signal to the main control chip; the Bluetooth signal includes a Bluetooth control signal and music data; when music needs to be played, the main control chip analyzes the Bluetooth signal to obtain the music data and generates a music modulation signal according to the music data; the main control chip controls the output of the PWM signal and / or the music modulation signal according to the Bluetooth control signal; the control signal receiving module further includes a remote control unit; the remote control unit is electrically connected to the main control chip and is used to receive the remote control signal sent by the remote control and transmit the remote control signal to the main control chip; the main control chip controls the output of the PWM signal and / or the music modulation signal according to the remote control signal.

[0010] Further, it further includes a power supply voltage stabilizing module; the power supply voltage stabilizing module includes a first power output unit, a second power output unit, and an enable voltage maintaining unit; the first power output unit is used to convert a DC power supply into a first power supply; the second power output unit is used to convert the first power supply into a second power supply; the first power supply and the second power supply are used to supply power to other modules of the circuit; the enable voltage maintaining unit is used to convert the DC power supply into an enable voltage; the enable voltage is connected to the enable terminal of the main control chip to prevent the main control chip from resetting; wherein, the first power output unit includes: a first diode, a second diode, a first capacitor, and a second capacitor; the anode of the diode is grounded, and the cathode is connected to the DC power supply; the anode of the second diode is connected to the DC power supply, and the cathode outputs the first power supply; one end of the first capacitor is connected to the DC power supply, and the other end is grounded; one end of the second capacitor is connected to the first power supply, and the other end is grounded; wherein, the second power output unit includes: a voltage stabilizing chip, a third diode, a third capacitor, and a fourth capacitor; the input end of the voltage stabilizing chip is connected to the first power supply, the grounding end is grounded, and the output end outputs the second power supply; the anode of the third diode is connected to the first power supply, and the cathode is connected to the second power supply; one end of the third capacitor is connected to the first power supply, and the other end is grounded; one end of the fourth capacitor is connected to the second power supply, and the other end is grounded; wherein, the enable voltage maintaining unit includes: a first triode, a first resistor, a second resistor, a three-terminal voltage stabilizing tube, and a third resistor; the base of the first triode is connected to the enable terminal of the main control chip and is the enable voltage output terminal; the collector is connected to the DC power supply through the first resistor, and the emitter is connected to the first pin of the three-terminal voltage stabilizing tube through the second resistor; the second pin of the three-terminal voltage stabilizing tube is connected to the base of the first triode, and the third pin is grounded; one end of the third resistor is connected to the first pin of the three-terminal voltage stabilizing tube, and the other end is grounded.

[0011] Further, the number of the LED driving modules is three; the three LED driving modules are respectively denoted as a first LED driving module, a second LED driving module and a third LED driving module; the main control chip outputs a first PWM signal, a second PWM signal and a third PWM signal respectively; the input ends of the first LED driving module, the second LED driving module and the third LED driving module are respectively connected to the first PWM signal, the second PWM signal and the third PWM signal, and the output ends are respectively connected to the red light emitting unit, the green light emitting unit and the blue light emitting unit of the lamp string body; wherein, the first LED driving module includes a fourth diode, a first MOS transistor, a fourth resistor, a fifth capacitor and a fifth diode; the anode of the fourth diode is connected to the first PWM signal, and the cathode is connected to the gate of the first MOS transistor MOS1; the first MOS transistor is an NMOS transistor, its gate is connected to the first PWM signal through the fourth diode; the source is connected to the DC power supply and connected to its own gate through the fourth resistor; the drain is connected to the first lamp string body; one end of the fifth capacitor is connected to the source of the first MOS transistor, and the other end is grounded; the anode of the fifth diode is connected to the second power supply, and the cathode is connected to the drain of the first MOS transistor.

[0012] Further, the storage module includes a storage chip and an eighth resistor; the enable terminal of the storage chip is connected to the storage enable signal output by the main control chip, the clock input terminal is connected to the storage clock signal output by the main control chip, the power supply terminal and the write protection enable terminal are connected to the storage chip power supply voltage output by the main control chip, the serial port input terminal and the serial port output terminal are respectively connected to the storage signal output terminal and the read signal input terminal of the main control chip; when the main control chip needs to store or read music data, it outputs a storage enable signal to the enable terminal of the storage chip and outputs a storage clock signal to the clock input terminal of the storage chip, so that the storage chip enters the working state; when the main control chip needs to store music data, it outputs the music data obtained through the USB module to the serial port input terminal of the main control chip through its storage signal output terminal, so that the storage chip stores the music data; when the main control chip needs to read the music data stored in the storage chip, the storage chip outputs the stored music data to the read signal input terminal of the main control chip through its serial port output terminal; the power amplifier module includes a power amplifier chip, a ninth resistor, a tenth resistor, an eleventh resistor, a ninth capacitor and a twelfth resistor; the power supply terminal of the power amplifier chip is connected to the first power supply, and the ground terminal is grounded; the enable terminal of the power amplifier chip is connected to the first power supply through the ninth resistor and is also connected to the power amplifier enable signal output by the main control chip through the tenth resistor; when music needs to be played, the main control chip outputs a power amplifier enable signal to the enable terminal of the power amplifier chip, so that the enable terminal of the power amplifier chip changes from high level to low level, and the power amplifier chip enters the working state; the input terminal of the power amplifier chip is connected to the music modulation signal output by the main control chip through the eleventh resistor and the ninth capacitor, and the first output terminal and the second output terminal are respectively used to connect the two input terminals of the speaker to drive the speaker to play music; one end of the twelfth resistor is connected to the input terminal of the power amplifier chip, and the other end is connected to the first output terminal of the power amplifier chip.

[0013] Based on the same inventive concept, the present utility model further provides an LED light string, including: a light string body and any one of the above LED light string drivers with music playing function; the input terminal of the driver is connected to an external DC power supply, and the output terminal is connected to the light string body to drive the light string body to emit light.

[0014] Based on the same inventive concept, the present utility model further provides a Christmas tree, including: a Christmas tree body and an LED light string wound around the Christmas tree body; the LED light string includes: a light string body and any one of the above LED light string drivers with music playing function; the input terminal of the driver is connected to an external DC power supply, and the output terminal is connected to the light string body to drive the light string body to emit light.

[0015] 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

[0016] Figure 1 Schematic diagram of the Christmas tree of the present utility model;

[0017] Figure 2 Schematic diagram of the structure of the LED string driver with music playing function of the present utility model;

[0018] Figure 3 Schematic diagram of the circuit module of the control board of the LED string driver with music playing function in Embodiment 1 of the present utility model;

[0019] Figure 4 Schematic diagram of the circuit structure of the control board of the LED string driver with music playing function in Embodiment 2 of the present utility model. Detailed Description of the Embodiments

[0020] It should be clear that the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. 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.

[0021] 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 of "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.

[0022] When the following description refers to the 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 only 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.

[0023] 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 association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: 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.

[0024] It should be understood that the embodiments of the present application are not limited to the exact structures already described and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the embodiments of the present application is only limited by the appended claims.

[0025] Please refer to Figure 1 , Figure 1 , which is a schematic 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 LED light string driver with a music playing function of the present utility model.

[0026] It can be seen from Figure 1 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 light string body 21 with a lighter weight 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.

[0027] Please refer to Figure 2 , Figure 2 , which is a schematic diagram of the structure of the LED light string driver with a music playing function of the present utility model. The driver 22 includes: a housing 221, a key board 222, a control board E, and a speaker 223. The key board 222, the control board E, and the speaker 223 are all installed inside the housing 221.

[0028] A first hole 221h1 and a second hole 221h2 are provided on the first surface of the housing 221. The power supply end of the control board E is connected to the DC power supply through the first hole 221h1, and the output end of the control board E is connected to the light string body 21 through the second hole.

[0029] On the second side of the housing 221, there are a number of sound-emitting slots 221g. The speaker 223 is installed inside the housing on the side close to the sound-emitting slots 221g, and its sound-emitting direction is directly opposite to the sound-emitting slots 221g. The speaker 223 is electrically connected to the control board E and plays music according to the audio modulation signal output by the control board E.

[0030] On the third side of the housing 221, there are a number of keycaps. The keypad 222 is installed inside the housing on the side close to the keycaps, and buttons are provided at positions corresponding to the keycaps. A plastic pad 221p is provided on the button. The keypad 222 is electrically connected to the control board E. When the user presses the keycaps on the housing 221, the corresponding buttons on the keypad 222 are triggered, enabling the keypad 222 to obtain a key signal and transmit the key signal to the control board E.

[0031] On the fourth side of the housing 221, there are feet pads 221m. During use, the fourth side of the housing with the feet pads 221m is made to contact the ground or the tabletop, thereby preventing the housing from being worn or soiled.

[0032] In this embodiment, the housing 221 includes an upper shell 221a and a lower shell 221b. The upper shell 221a and the lower shell 221b are closed by snap fasteners to form the housing 221 that encloses the keypad, the control board, and the speaker.

[0033] Example 1

[0034] Please refer to Figure 3 , Figure 3 which is a schematic diagram of the circuit module of the control board of the LED lamp string driver with a music playback function in Embodiment 1 of the present utility model. There are circuits provided on the control board E, including: a power supply voltage stabilization module E1, a crystal oscillator module E2, a main control chip MCU, a control signal receiving module E3, an LED driving module E4, a Bluetooth antenna E5, a USB module E6, a storage module E7, and a power amplifier module E8.

[0035] The power supply voltage stabilization module E1 is connected to an external DC power supply and is used to convert the DC power supply into the supply voltage required by other modules.

[0036] The crystal oscillator module E2 is used to form a crystal oscillator circuit and provide the clock signal required for the operation of the main control chip MCU.

[0037] The control signal receiving module E3 includes a key control unit and a remote control unit connected to the main control chip MCU. The key control unit is connected to the buttons on the key board 222. When the user triggers the buttons, the key control unit acquires and outputs key signals to the main control chip MCU. The remote control unit receives the radio wave-based remote control signals generated by the user operating the remote control, and outputs the remote control signals to the main control chip MCU. The main control chip MCU generates a PWM signal for controlling the LED driving module E4 according to the key signals and / or remote control signals.

[0038] The input end of the LED driving module E4 is connected to the PWM signal output end of the main control chip MCU, and the output end is connected to the lamp string body 21; the LED driving module drives the lamp string body 21 to emit light according to the PWM signal.

[0039] The Bluetooth antenna E5 is electrically connected to the main control chip MCU and is used for receiving Bluetooth signals sent by a host computer (such as a mobile phone, a tablet computer, a PC). The Bluetooth signals include both Bluetooth control signals and music data.

[0040] One end of the USB module E6 is used for connecting to a host computer, and the other end is connected to the main control chip MCU to transmit music data to the main control chip MCU. The main control module MCU processes the music data and then transmits it to the storage module E7 for storage. When the main control module MCU needs to play music, it obtains music data by parsing the Bluetooth signals or by reading the storage module E7, and then generates a music modulation signal according to the music data.

[0041] One end of the power amplifier module E8 is connected to the music modulation signal output end of the main control module MCU, and the other end is used for connecting to the speaker 223; the power amplifier module E8 drives the speaker 223 to play music according to the music modulation signal.

[0042] Example 2

[0043] The modules of the LED lamp string driver with a music playing function in Embodiment 2 of the present utility model are basically the same as those in Embodiment 1, and the differences are as follows: The main control chip MCU outputs 3 PWM signals, which are respectively denoted as the first PWM signal PWM1, the second PWM signal PWM2, and the third PWM signal PWM3. The number of the LED driving modules E4 is 3, and the 3 LED driving modules are respectively denoted as the first LED driving module, the second LED driving module, and the third LED driving module. Each LED lamp bead on the lamp string body 21 includes a red light emitting unit, a green light emitting unit, and a blue light emitting unit.

[0044] The first PWM signal PWM1, the second PWM signal PWM2, and the third PWM signal PWM3 respectively control the first LED driving module, the second LED driving module, and the third LED driving module. The first LED driving module, the second LED driving module, and the third LED driving module respectively control the red light-emitting unit, the green light-emitting unit, and the blue light-emitting unit of the LED lamp beads on the lamp string body 21. Therefore, the three PWM signals output by the main control chip MCU can respectively control the brightness of the red light, green light, and blue light emitted by the red light-emitting unit, the green light-emitting unit, and the blue light-emitting unit of the LED lamp beads. The red light, green light, and blue light of the LED lamp beads can be combined into light of any color and any brightness, that is: the three PWM signals output by the main control chip MCU can control the color and brightness of the light emitted by the LED lamp beads on the lamp string body.

[0045] Specifically, please refer to Figure 4 , Figure 4 which is a schematic circuit diagram of the control board of the LED lamp string driver with music playing function in Embodiment 2 of the present invention.

[0046] The power supply voltage stabilization module E1 includes a first power output unit E11, a second power output unit E12, and an enable voltage maintaining unit E13. The first power output unit E11 is used to convert the DC power supply into a first power supply V1. The first power supply V1 supplies power to the power amplifier module and the USB module. The second power output unit is used to convert the first power supply V1 into a second power supply V2. The second power supply V2 is used to supply power to the LED driving module, the main control chip, and the storage module. The enable voltage maintaining unit is used to convert the DC power supply into an enable voltage EN. The enable voltage EN is connected to the enable terminal of the main control chip to prevent the main control chip from resetting.

[0047] Specifically, the first power output unit includes: a first diode D1, a second diode D2, a first capacitor C1, and a second capacitor C2. The anode of the diode D1 is grounded, and the cathode is connected to the DC power supply. The anode of the second diode is connected to the DC power supply, and the cathode outputs the first power supply V1. One end of the first capacitor C1 is connected to the DC power supply, and the other end is grounded. One end of the second capacitor C2 is connected to the first power supply V1, and the other end is grounded.

[0048] Specifically, the second power output unit includes: a voltage regulator chip U1, a third diode D3, a third capacitor C3, and a fourth capacitor C4. The input terminal of the voltage regulator chip U1 is connected to the first power supply V1, the ground terminal is grounded, and the output terminal outputs the second power supply V2. The anode of the third diode D3 is connected to the first power supply V1, and the cathode is connected to the second power supply V2. One end of the third capacitor C3 is connected to the first power supply V1, and the other end is grounded. One end of the fourth capacitor C4 is connected to the second power supply V2, and the other end is grounded.

[0049] The specific voltage value of the DC power supply is between 3V and 36V, and the specific voltage values of the first power supply V1 and the second power supply V2 are set according to actual needs. In this embodiment, the DC power supply is 6V, the first power supply V1 is 5V, and the second power supply V2 is 2V.

[0050] Specifically, the enable voltage maintaining unit includes: a first triode Q1, a first resistor R1, a second resistor R2, a three-terminal voltage regulator Z1, and a third resistor R3. The base of the first triode Q1 is connected to the enable terminal EN of the main control chip, which is the output terminal of the enable voltage EN; the collector is connected to the DC power supply through the first resistor R1, and the emitter is connected to the first terminal of the three-terminal voltage regulator Z1 through the second resistor R2. The second terminal (cathode) of the three-terminal voltage regulator Z1 is connected to the base of the first triode Q1, and the third terminal (anode) is grounded. One end of the third resistor R3 is connected to the first terminal of the three-terminal voltage regulator Z1, and the other end is grounded.

[0051] The crystal oscillator module includes a crystal oscillator chip U2. The first terminal XO_N and the third terminal XO_P of the crystal oscillator chip are respectively connected to two crystal oscillator connection terminals of the main control chip MCU, and the second terminal and the fourth terminal are both grounded. The crystal oscillator chip U2 and the components inside the main control chip MCU jointly form a crystal oscillator circuit to generate a clock signal.

[0052] The control signal receiving module E3 includes a key control unit E31 and a remote control unit E32 connected to the main control chip MCU. The key control unit E31 is connected to the buttons on the key board 222. When the user triggers the button, the key control unit E31 obtains and outputs a key signal PWRKEY to the main control chip MCU. The remote control unit E32 receives the remote control signal IR based on radio waves generated by the user operating the remote control, and outputs the remote control signal IR to the main control chip MCU. The main control chip MCU outputs a first PWM signal PWM1, a second PWM signal PWM2, and a third PWM signal PWM3 according to the key signal PWRKEY and / or the remote control signal IR.

[0053] The first LED driving module includes a fourth diode D4, a first MOS transistor MOS1, a fourth resistor R4, a fifth capacitor C5, and a fifth diode D5. The anode of the fourth diode D4 is connected to the first PWM signal PWM1, and the cathode is connected to the gate of the first MOS transistor MOS1. The first MOS transistor MOS1 is an NMOS transistor, whose gate is connected to the first PWM signal PWM1 through the fourth diode D4; the source is connected to the DC power supply and is connected to its own gate through the fourth resistor R4; the drain is the first output terminal OUT1 for connecting the red light emitting unit. One end of the fifth capacitor C5 is connected to the source of the first MOS transistor MOS1, and the other end is grounded. The anode of the fifth diode D5 is connected to the second power supply V2, and the cathode is connected to the drain of the first MOS transistor MOS1.

[0054] The second LED driving module includes a sixth diode D6, a second MOS transistor MOS2, a fifth resistor R5, a sixth capacitor C6, and a seventh diode D7. The anode of the sixth diode D6 is connected to the second PWM signal PWM2, and the cathode is connected to the gate of the second MOS transistor MOS2. The second MOS transistor MOS2 is an NMOS transistor, whose gate is connected to the second PWM signal PWM2 through the sixth diode D6; the source is connected to the DC power supply and is connected to its own gate through the fifth resistor R5; the drain is the second output terminal OUT2 for connecting the green light emitting unit. One end of the sixth capacitor C6 is connected to the source of the second MOS transistor MOS2, and the other end is grounded. The anode of the seventh diode D7 is connected to the second power supply V2, and the cathode is connected to the drain of the first MOS transistor MOS1.

[0055] The third LED driving module includes an eighth diode D8, a third MOS transistor MOS3, a sixth resistor R6, a seventh capacitor C7, and a ninth diode D9. The anode of the eighth diode D8 is connected to the third PWM signal PWM3, and the cathode is connected to the gate of the third MOS transistor MOS3. The third MOS transistor MOS3 is an NMOS transistor, whose gate is connected to the third PWM signal PWM3 through the eighth diode D8; the source is connected to the DC power supply and is connected to its own gate through the sixth resistor R6; the drain is the third output terminal OUT3 for connecting the blue light emitting unit. One end of the seventh capacitor C7 is connected to the source of the third PWM signal PWM3, and the other end is grounded. The anode of the ninth diode D9 is connected to the second power supply V2, and the cathode is connected to the drain of the third MOS transistor MOS3.

[0056] The USB module E6 includes a USB chip USB1, a seventh resistor R7, and an eighth capacitor C8. The power supply terminal of the USB chip is connected to a first power supply V1 through the seventh resistor R7. A first differential output terminal DP and a second differential output terminal DM are respectively connected to a first music data input terminal DP and a second music data input terminal DM of the main control chip. The ground terminal is grounded. The eighth capacitor C8 is connected in parallel between the power supply terminal and the ground terminal of the USB chip. During use, the input port of the USB chip USB1 is connected to a host computer to obtain music data transmitted by the host computer, and then the music data is differentially transmitted to the main control chip through its first differential output terminal DP and second differential output terminal DM.

[0057] The storage module E7 includes a storage chip U3 and an eighth resistor R8. The enable terminal CS of the storage chip U3 is connected to a storage enable signal CS output by the main control chip MCU. The clock input terminal SCK is connected to a storage clock signal CLK output by the main control chip MCU. The power supply terminal VCC and the write protection enable terminal WP are connected to a storage chip power supply voltage VDDIO output by the main control chip MCU. A serial input terminal SI and a serial output terminal SO are respectively connected to a storage signal output terminal DI and a read signal input terminal DO of the main control chip. When the main control chip MCU needs to store or read music data, it outputs a storage enable signal CS to the enable terminal CS of the storage chip U3 and outputs a storage clock signal CLK to the clock input terminal SCK of the storage chip U3, so that the storage chip U3 enters a working state. When the main control chip MCU needs to store music data, the music data obtained through the USB module E6 is output to the serial input terminal SI of the storage chip U3 through its storage signal output terminal DI, so that the storage chip U3 stores the music data. When the main control chip MCU needs to read the music data stored in the storage chip U3, the stored music data is output from the serial output terminal SO of the storage chip U3 to the read signal input terminal DO of the main control chip MCU.

[0058] The power amplifier module E8 includes a power amplifier chip U4, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a ninth capacitor C9, and a twelfth resistor R12. The power supply terminal VCC of the power amplifier chip U4 is connected to the first power supply V1, and the ground terminal GND is grounded. The enable terminal SD of the power amplifier chip U4 is connected to the first power supply V1 through a ninth resistor R9 with a relatively large resistance value (e.g., 100 kΩ), and at the same time is connected to the power amplifier enable signal MUTE output by the main control chip MCU through a tenth resistor R10 with a relatively small resistance value (e.g., 1 kΩ). When music needs to be played, the main control chip MCU outputs the power amplifier enable signal MUTE to the enable terminal SD of the power amplifier chip U4, so that the enable terminal SD of the power amplifier chip U4 changes from a high level to a low level, and the power amplifier chip U4 enters the working state. The input terminal VIN of the power amplifier chip U4 is connected to the music modulation signal DACL output by the main control chip through an eleventh resistor R11 and a ninth capacitor C9. The first output terminal SPTP and the second output terminal SPTN are respectively used to connect the two input terminals of the speaker 223 to drive the speaker 223 to play music. One end of the twelfth resistor R13 is connected to the input terminal of the power amplifier chip U4, and the other end is connected to the first output terminal SPTP of the power amplifier chip U4.

[0059] In this embodiment, the model of the main control chip MCU is AB5356A; the model of the voltage regulator chip U1 is XC6206 - 4.2V; the model of the three - terminal voltage regulator Z1 is ME432; the model of the crystal oscillator chip U2 is 26MHz / 9PF / 10PPM; the model of the storage chip U3 is EN25Q128; the model of the power amplifier chip U4 is XA8002DC; the model of the USB chip USB1 is USB_AM_02; the models of the first MOS transistor MOS1, the second MOS transistor MOS2, and the third MOS transistor MOS3 are all 40P07; the model of the triode Q1 is D882. For the specific parameters of other capacitors and resistors, those skilled in the art can adjust them according to needs, and the present utility model does not make specific limitations.

[0060] The LED string driver of the present utility model provides two music playing methods: 1. The main control chip establishes a wireless connection with the host computer through the Bluetooth antenna, obtains the music data transmitted by the host computer in real time, and then converts the music data into a music modulation signal DACL and transmits it to the power amplifier module; the power amplifier module drives the speaker to play music. 2. The main control chip pre - obtains the music data in the host computer through the USB module and saves the music data in the storage module; when music needs to be played, the main control chip reads the music data in the storage module, converts the music data into a music modulation signal, and transmits it to the power amplifier module; the power amplifier module drives the speaker to play music.

[0061] Users can control the music playback and LED string driving of the LED string driver of the present utility model in the following three ways: 1. Output a key signal PWRKEY to the main control chip by operating the button provided on the housing, and the main control chip controls the storage module, power amplifier module, and / or LED driving module according to the key signal PWRKEY. 2. Generate a remote control signal IR based on radio waves by operating a remote control, and the main control chip controls the storage module, power amplifier module, and / or LED driving module according to the remote control signal IR. 3. Generate a Bluetooth signal by operating a host computer Bluetooth-connected to the main control chip, and the main control chip controls the storage module, power amplifier module, and / or LED driving module according to the Bluetooth signal.

[0062] The present utility model has the following technical effects: 1. The driver is separated from the LED string body and is connected through a wiring terminal only during use. When a user arranges a Christmas tree, the user can first wind the relatively light LED string body around the Christmas tree and finally connect the LED string body to the driver, thus improving the installation experience. 2. The driver has a music playback function, which not only meets the user's need to decorate the Christmas tree but also gives the user a sense of pleasure in enjoying music, has a better effect of rendering the festival atmosphere, and the user experience is more novel. 3. Users can control the LED string lighting and / or music playback effect through multiple ways such as buttons, remote control, and Bluetooth, which is applicable to various operation scenarios and is more convenient to use.

[0063] The above embodiments only represent several implementation manners of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and the present utility model also intends to include these modifications and deformations.

Claims

1. An LED string driver with a music playing function, characterized in that, Comprising: a housing, a control board and a speaker disposed inside the housing; a first hole and a second hole are provided on a first surface of the housing; a power supply terminal of the control board is connected to an external DC power supply through the first hole, and an output terminal of the control board is connected to an external lamp string body through the second hole; a plurality of sound emitting grooves are provided on a second surface of the housing; the speaker is installed on one side inside the housing close to the sound emitting grooves, and its sound emitting direction faces the sound emitting grooves; the speaker is electrically connected to the control board and plays music according to an audio modulation signal output by the control board.

2. The LED lamp string driver with music playing function according to claim 1, wherein: it further includes a key board; a plurality of key caps are provided on a third surface of the housing; the key board is installed on one side inside the housing close to the key caps, and buttons are provided at positions corresponding to the key caps; the key board is electrically connected to the control board; the key board obtains a key signal generated when a button is pressed and transmits it to the control board.

3. The LED lamp string driver with music playing function according to claim 2, wherein: a circuit is provided on the control board; the circuit includes: a control signal receiving module, a main control chip, an LED driving module and a power amplifier module; the control signal receiving module includes a key control unit, which is connected to the buttons on the key board and is used to obtain and transmit the key signal to the main control chip; the main control chip controls the output of PWM signals and / or music modulation signals according to the key signal; the LED driving module is electrically connected to the lamp string body and drives the lamp string body to emit light according to the PWM signal; the power amplifier module is electrically connected to the speaker and plays music according to the music modulation signal.

4. The LED lamp string driver with music playing function according to claim 3, wherein: the circuit further includes: a USB module and a storage module; the USB module is used to connect to an external host computer, obtain music data transmitted by the host computer, and transmit the music data to the main control chip; the main control chip processes the music data and then transmits it to the storage module for storage; when the main control chip needs to play music, it reads the music data in the storage module and generates a music modulation signal according to the music data.

5. The LED lamp string driver with music playing function according to claim 4, wherein: the circuit further includes a Bluetooth antenna; the Bluetooth antenna is electrically connected to the main control chip and is used to receive a Bluetooth signal sent by the host computer and transmit the Bluetooth signal to the main control chip; the Bluetooth signal includes a Bluetooth control signal and music data; when the main control chip needs to play music, it analyzes the Bluetooth signal to obtain music data and generates a music modulation signal according to the music data; the main control chip controls the output of PWM signals and / or music modulation signals according to the Bluetooth control signal; The control signal receiving module further includes a remote control unit; the remote control unit is electrically connected to the main control chip, and is configured to receive a remote control signal sent by a remote controller and transmit the remote control signal to the main control chip; the main control chip controls the output of a PWM signal and / or a music modulation signal according to the remote control signal.

6. The LED string driver with a music playing function according to claim 5, wherein: It further includes a power supply voltage stabilization module; The power supply voltage stabilization module includes a first power output unit, a second power output unit, and an enable voltage maintaining unit; the first power output unit is configured to convert a DC power supply into a first power supply; the second power output unit is configured to convert the first power supply into a second power supply; the first power supply and the second power supply are used to supply power to other modules of the circuit; the enable voltage maintaining unit is configured to convert the DC power supply into an enable voltage; the enable voltage is connected to the enable terminal of the main control chip to prevent the main control chip from resetting; Wherein, the first power output unit includes: a first diode, a second diode, a first capacitor, and a second capacitor; the anode of the diode is grounded, and the cathode is connected to the DC power supply; the anode of the second diode is connected to the DC power supply, and the cathode outputs the first power supply; one end of the first capacitor is connected to the DC power supply, and the other end is grounded; one end of the second capacitor is connected to the first power supply, and the other end is grounded; Wherein, the second power output unit includes: a voltage regulator chip, a third diode, a third capacitor, and a fourth capacitor; the input end of the voltage regulator chip is connected to the first power supply, the grounding end is grounded, and the output end outputs the second power supply; the anode of the third diode is connected to the first power supply, and the cathode is connected to the second power supply; one end of the third capacitor is connected to the first power supply, and the other end is grounded; one end of the fourth capacitor is connected to the second power supply, and the other end is grounded; Wherein, the enable voltage maintaining unit includes: a first triode, a first resistor, a second resistor, a three-terminal voltage regulator tube, and a third resistor; the base of the first triode is connected to the enable terminal of the main control chip, which is the enable voltage output terminal; the collector is connected to the DC power supply through the first resistor, and the emitter is connected to the first pin of the three-terminal voltage regulator tube through the second resistor; the second pin of the three-terminal voltage regulator tube is connected to the base of the first triode, and the third pin is grounded; one end of the third resistor is connected to the first pin of the three-terminal voltage regulator tube, and the other end is grounded.

7. The LED string driver with a music playing function according to claim 6, wherein: The number of the LED driving modules is three; the three LED driving modules are respectively denoted as a first LED driving module, a second LED driving module, and a third LED driving module; the main control chip respectively outputs a first PWM signal, a second PWM signal, and a third PWM signal; the input ends of the first LED driving module, the second LED driving module, and the third LED driving module are respectively connected to the first PWM signal, the second PWM signal, and the third PWM signal, and the output ends are respectively connected to the red light emitting unit, the green light emitting unit, and the blue light emitting unit of the lamp string body; Among them, the first LED driving module includes a fourth diode, a first MOS transistor, a fourth resistor, a fifth capacitor, and a fifth diode; the anode of the fourth diode is connected to the first PWM signal, and the cathode is connected to the gate of the first MOS transistor MOS1; the first MOS transistor is an NMOS transistor, whose gate is connected to the first PWM signal through the fourth diode; the source is connected to the DC power supply and connected to its own gate through the fourth resistor; the drain is connected to the first lamp string body; one end of the fifth capacitor is connected to the source of the first MOS transistor, and the other end is grounded; the anode of the fifth diode is connected to the second power supply, and the cathode is connected to the drain of the first MOS transistor.

8. The LED lamp string driver with music playing function according to claim 7, wherein: The storage module includes a storage chip and an eighth resistor; the enable terminal of the storage chip is connected to the storage enable signal output by the main control chip, the clock input terminal is connected to the storage clock signal output by the main control chip, the power supply terminal and the write protection enable terminal are connected to the storage chip power supply voltage output by the main control chip, and the serial port input terminal and the serial port output terminal are respectively connected to the storage signal output terminal and the read signal input terminal of the main control chip; When the main control chip needs to store or read music data, it outputs a storage enable signal to the enable terminal of the storage chip and outputs a storage clock signal to the clock input terminal of the storage chip, so that the storage chip enters the working state; when the main control chip needs to store music data, it outputs the music data obtained through the USB module to the serial port input terminal of the main control chip through its storage signal output terminal, so that the storage chip stores the music data; when the main control chip needs to read the music data stored in the storage chip, the storage chip outputs the stored music data to the read signal input terminal of the main control chip through its serial port output terminal; The power amplifier module includes a power amplifier chip, a ninth resistor, a tenth resistor, an eleventh resistor, a ninth capacitor, and a twelfth resistor; the power supply terminal of the power amplifier chip is connected to the first power supply, and the ground terminal is grounded; the enable terminal of the power amplifier chip is connected to the first power supply through the ninth resistor and is also connected to the power amplifier enable signal output by the main control chip through the tenth resistor; When music needs to be played, the main control chip outputs a power amplifier enable signal to the enable terminal of the power amplifier chip, so that the enable terminal of the power amplifier chip changes from high level to low level, and the power amplifier chip enters the working state; the input terminal of the power amplifier chip is connected to the music modulation signal output by the main control chip through the eleventh resistor and the ninth capacitor, and the first output terminal and the second output terminal are respectively used to connect the two input terminals of the speaker to drive the speaker to play music; One end of the twelfth resistor is connected to the input terminal of the power amplifier chip, and the other end is connected to the first output terminal of the power amplifier chip.

9. An LED light string, characterized in that, Comprising: A lamp string body and the LED lamp string driver with music playing function according to any one of claims 1-8; The input terminal of the driver is connected to an external DC power supply, and the output terminal 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 light string wound around the Christmas tree body; The LED light string includes: a light string body and an LED light string driver with a music playing function as described in any one of claims 1-8; The input end of the driver is connected to an external DC power supply, and the output end is connected to the light string body to drive the light string body to emit light.

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