Pedal type LED lamp string driver, LED lamp string and Christmas tree

Abstract

The utility model relates to a pedal type LED lamp string driver, an LED lamp string and a Christmas tree. The utility model discloses a pedal type LED lamp string driver which comprises a shell and a control panel arranged in the shell. A columnar key is arranged on the control panel; 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 an output end used for being externally connected with the lamp string body. When a user triggers the columnar key, the control panel receives a key signal, generates a PWM signal according to the key signal and outputs the PWM signal to the lamp string body. The driver is separated from the LED lamp string body and is connected with the LED lamp string body through the wiring terminal when the LED lamp string is used. When a user arranges a Christmas tree, the LED lamp string body with light weight can be wound on the Christmas tree, and then the LED lamp string body and the driver are connected, so that the installation experience is improved. A user can control the light-emitting effect of the LED lamp string through the foot switch and the remote controller, and the LED lamp string is suitable for various operation scenes and more convenient to use.

Description

Technical Field

[0001] The utility model relates to the field of LED lights, in particular to a foot-operated LED light string driver, an LED light string and a Christmas tree. Background Art

[0002] During Christmas, decorating houses or yards with Christmas trees is a traditional custom in many Western countries. 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 light string. When in use, the equipped LED light string is wound around the Christmas tree, and the LED light string is powered on and emits light, achieving the effect of decorating the Christmas tree.

[0003] In some existing LED light string products, the LED light string body is connected to a power supply through a driver, and the driver can control the LED light string to achieve richer lighting effects. However, the drivers of existing Christmas tree LED light strings are usually integrally connected to the light string body and the power supply. When a user decorates a Christmas tree, they need to wind the LED light 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 light string and the installation experience is poor. Also, the drivers of existing Christmas tree LED light strings cannot be controlled by both a foot switch and a remote control, and the user experience is poor. Summary of the Utility Model

[0004] Based on this, the purpose of the present utility model is to provide a foot-operated LED light string driver, an LED light string and a Christmas tree, in which the driver is separated from the light string body and is only connected through a terminal when in use, improving the installation experience.

[0005] The present utility model provides a foot-operated LED light string driver, including: a housing and a control board disposed inside the housing; a columnar button is provided on the control board; power supply terminals for externally connecting a DC power supply and output terminals for externally connecting the light string body are provided at both ends of the control board; when a user triggers the columnar button, the control board receives a button signal, generates a PWM signal according to the button signal, and outputs the PWM signal to the light string body.

[0006] The present utility model has the following technical effects: 1. The driver is separated from the LED light string body and is only connected through a terminal when in use. When a user decorates a Christmas tree, they can first wind the relatively light LED light string body around the Christmas tree, and finally connect the LED light string body to the driver, thus improving the installation experience. 2. The user can control the lighting effect of the LED light string through a foot switch, which is convenient to use.

[0007] Further, the pedal - type LED light string driver further includes a spring and a keycap; an installation hole for installing the keycap is provided at the top of the housing; the spring is sleeved on the columnar button of the control board; the keycap covers the top of the columnar button and abuts against the top of the spring, protruding from the installation hole at the top of the housing.

[0008] Further, a circuit is provided on the control board; the circuit includes: a control signal receiving module, a main control chip, and an LED driving module; the control signal receiving module includes a button control unit and a remote control unit connected to the main control chip; the button control unit is connected to the columnar button and is configured to obtain and output a button signal to the main control chip when the user triggers the columnar button; the remote control unit is configured to obtain a radio frequency signal emitted by the remote control when the user operates the remote control, convert the radio frequency signal into a remote control signal, and output it to the main control chip; the main control chip outputs a PWM signal to the LED driving module according to the button signal and / or the remote control signal; the LED driving module drives the external light string body to emit light according to the PWM signal.

[0009] Further, the circuit further includes a power supply voltage stabilization module and a crystal oscillator module; the power supply voltage stabilization module is used to connect to an external DC power supply, convert the DC power supply into a stable first voltage, so as to supply power to other modules of the circuit; the crystal oscillator module provides a clock signal required for the operation of the main control chip.

[0010] Further, the power supply voltage stabilization module includes a first diode, a voltage stabilization chip, and a first capacitor; the anode of the first diode is used to connect to an external DC power supply, and the cathode is connected to the input end of the voltage stabilization chip; the ground end of the voltage stabilization chip is grounded, and the output end is the first voltage output end; one end of the first capacitor is connected to the output end of the voltage stabilization chip, and the other end is grounded.

[0011] Further, the remote control unit includes a radio frequency receiving chip, a fourth capacitor, a first inductor, a second crystal oscillator, and a fifth capacitor; the radio frequency receiving end of the radio frequency receiving chip is externally connected to a signal receiving antenna through the fourth capacitor; one end of the first inductor is connected to the signal receiving end of the radio frequency receiving chip, and the other end is grounded; the remote control signal output end of the radio frequency receiving chip is connected to the remote control signal input end of the main control chip; the radio frequency receiving chip obtains a radio frequency signal generated by a user operating a remote control through its radio frequency receiving end, then demodulates the radio frequency signal to obtain a remote control signal, and outputs the remote control signal to the main control chip through its remote control signal output end; the crystal oscillator connection end of the radio frequency receiving chip is connected to the second crystal oscillator; one end of the second crystal oscillator is connected to the crystal oscillator connection end of the radio frequency receiving chip, and the other end is grounded; the power supply end of the radio frequency receiving chip is connected to the first voltage; one end of the fifth capacitor is connected to the power supply end of the radio frequency receiving chip, and the other end is grounded.

[0012] Further, the LED driving module includes a first triode, a second triode, a first resistor, a second resistor, a third resistor, a second diode, a fourth resistor, a fifth resistor, a third triode, a fourth triode, a sixth resistor, and a seventh resistor; both the first triode and the second triode are NPN-type triodes; the collector of the first triode is externally connected to a DC power supply, the base is connected to its collector through the first resistor, and the emitter is the first output end externally connected to the lamp string body; the collector of the second triode is connected to the DC power supply, the base is connected to its collector through the second resistor, and the emitter is the second output end externally connected to the lamp string body; the third resistor is connected across the first output end and the second output end; the cathode of the second diode is connected to the base of the first triode, and the anode is connected to the emitter of the second triode through the fourth resistor; the cathode of the third diode is connected to the base of the second triode, and the anode is connected to the emitter of the first diode through the fifth resistor; both the third triode and the fourth triode are PNP-type triodes; the emitter of the third triode is connected to the first output end, the collector is grounded, and the base is connected to the first PMW signal output end of the main control chip through the sixth resistor; the emitter of the fourth triode is connected to the second output end, the collector is grounded, and the base is connected to the second PWM signal output end of the main control chip MCU through the seventh resistor.

[0013] Further, the crystal oscillator module includes a first crystal oscillator, a second capacitor, and a third capacitor; both ends of the first crystal oscillator are respectively connected to the first crystal oscillator connection end and the second crystal oscillator connection end of the main control chip; one end of the second capacitor is connected to the first crystal oscillator connection end of the main control chip, and the other end is grounded; one end of the third capacitor is connected to the second crystal oscillator connection end of the main control chip, and the other end is grounded.

[0014] Based on the same inventive concept, the present utility model further provides an LED light string, comprising: a light string body and any one of the above-mentioned foot-operated LED light string drivers; 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.

[0015] Based on the same inventive concept, the present utility model further provides a Christmas tree, comprising: a Christmas tree body and an LED light string wound around the Christmas tree body; the LED light string comprises: a light string body and any one of the above-mentioned foot-operated LED light string drivers; 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.

[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 It is a schematic diagram of the Christmas tree of the present utility model;

[0018] Figure 2 It is a schematic structural diagram of the foot-operated LED light string driver of the present utility model;

[0019] Figure 3 It is a schematic diagram of the circuit module of the control board of the foot-operated LED light string driver in Embodiment 1 of the present utility model;

[0020] Figure 4 It is a schematic diagram of the circuit structure of the control board of the foot-operated LED light string driver in Embodiment 4 of the present utility model. Detailed Embodiments

[0021] 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope protected by the embodiments of the present application.

[0022] 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.

[0023] 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.

[0024] 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 and indicates 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.

[0025] Example 1

[0026] 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 foot-operated LED light string driver of the present utility model.

[0027] As can be seen from Figure 1 , 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.

[0028] Please refer to Figure 2 , Figure 2 , which is a schematic structural diagram of the foot-operated LED light string driver of the present utility model. The driver 22 includes: a housing 221, a control board 222, a spring 223, a key cap 224, and a limiting plate 225.

[0029] The housing 221 includes an upper housing 221a and a lower housing 221b, and the upper housing 221a and the lower housing 221b are fixedly connected by screws 221c. An installation hole for installing the keycap is provided in the middle of the upper housing 221a.

[0030] The control board 222 is installed inside the housing 221, and has columnar buttons 222a thereon. Power supply terminals 222b for connecting to a DC power supply and output terminals 222c for connecting to the lamp string body are provided at both ends of the control board 222.

[0031] The spring 223 is sleeved on the columnar button 222a.

[0032] The keycap 224 covers the top of the columnar button 222a, abuts against the top of the spring 223, and protrudes from the installation hole in the middle of the upper housing 221a. The spring 223 is used to support the keycap 224 so that the keycap 224 remains in a protruding state. When the user steps on the keycap 224, the spring 223 is compressed, the columnar button 222a is triggered, so that the control board 222 receives a key signal. The control board 222 generates a PWM signal according to the key signal and outputs the PWM signal to the lamp string body 21, thereby controlling the lighting of the LED lamp string 2.

[0033] A hole matching the columnar button 222a is provided in the middle of the limiting plate 225. The limiting plate 225 is sleeved on the bottom of the columnar button 222a to fix the columnar button 222a and prevent the columnar button 222a from shifting.

[0034] Please refer to Figure 3 , Figure 3 , which is a schematic diagram of the circuit module of the control board of the pedal type LED lamp string driver according to Embodiment 1 of the present invention. A circuit E is provided on the control board 222, which includes: a power supply voltage stabilization module E1, a crystal oscillator module E2, a main control chip MCU, a control signal receiving module E3, and an LED driving module E4.

[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 a stable first voltage V1 to supply power to other modules.

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

[0037] The control signal receiving module E3 includes a button control unit E31 and a remote control unit E32 connected to the main control chip MCU. The button control unit E31 is connected to the columnar button 222a. When the user triggers the columnar button 222a, the button control unit E31 acquires and outputs a button signal PA0 to the main control chip MCU. The remote control unit E32 receives a 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 PC5 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 PA0 and / or the remote control signal PC5.

[0038] The input end of the LED driving module E4 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 E4 drives the lamp string body 21 to emit light according to the PWM signal.

[0039] Example 2

[0040] In this embodiment, the PWM signal output by the main control chip MCU includes a first PWM signal PA4 and a second PWM signal PA2. The output end of the LED driving module E4 includes a first output end Lo1 and a second output end Lo2. The lamp string body 21 includes a white light emitting unit connected to the first output end Lo1 and a colored light emitting unit connected to the second output end Lo2.

[0041] The first PWM signal PA4 output by the main control chip MCU controls the current output by the first output end Lo1 of the LED driving module E4, thereby controlling the white light emitted by the white light emitting unit of the lamp string body 21; the second PWM signal PA2 output by the main control chip MCU controls the current output by the second output end Lo2 of the LED driving module E4, thereby controlling the colored light emitted by the colored light emitting unit of the lamp string body 21.

[0042] For example, when the main control chip MCU only outputs the first PWM signal PA4 and does not output the second PWM signal PA2, the lamp string body 21 only emits white light; when the main control chip MCU only outputs the second PWM signal PA2 and does not output the first PWM signal PA4, the lamp string body 21 only emits colored light; when the main control chip MCU outputs both the first PWM signal PA4 and the second PWM signal PA2, the lamp string body 21 emits both white light and colored light.

[0043] Example 3

[0044] In this embodiment, both the white light emitting unit and the colored light emitting unit of the lamp string body 21 are composed of a plurality of LED lamp beads and breathing bulbs. When powered on, the LED lamp beads are constantly on; the breathing bulbs are constantly on when the current is less than the preset threshold, and flash when the current is greater than the preset threshold. Specifically, a driving chip is built into the breathing bulb. The driving chip built into the breathing bulb can detect whether the current reaches the preset threshold. When the current does not reach the preset threshold, the driving chip controls the breathing bulb to be constantly on and controls the brightness of the breathing bulb according to the magnitude of the current; when the current reaches the preset threshold, the driving chip controls the breathing bulb to perform breathing flashing, that is, controls the breathing bulb to repeat the cycle of "gradually brightening → brightest → gradually dimming → darkest" according to a preset period.

[0045] In this embodiment, the preset threshold refers to 80% of the maximum rated current. When the duty cycle of the first PWM signal or the second PWM signal output by the main control chip MCU is greater than 80%, the current output by the first output terminal Lo1 or the second output terminal Lo2 is greater than 80% of the maximum rated current. At this time, the LED lamp beads are constantly on and the breathing bulbs flash. When the duty cycles of the first PWM signal and the second PWM signal output by the main control chip MCU are less than or equal to 80%, the current output to the lamp string body 21 is less than or equal to 80% of the maximum rated current. At this time, both the LED lamp beads and the breathing bulbs are constantly on.

[0046] Example 4

[0047] Please refer to Figure 4 , Figure 4 which is a schematic circuit diagram of the control board of the foot-operated LED lamp string driver according to Embodiment 4 of the present utility model.

[0048] Specifically, the power supply voltage stabilizing module E1 includes a first diode D1, a voltage stabilizing chip U1, and a first capacitor C1. The anode of the first diode D1 is connected to the DC power supply, and the cathode is connected to the input terminal of the voltage stabilizing chip U1. The grounding terminal of the voltage stabilizing chip U1 is grounded, and the output terminal is the first voltage V1 output terminal. One end of the first capacitor C1 is connected to the output terminal of the voltage stabilizing chip U1, and the other end is grounded. The voltage of the DC power supply is between 3V and 36V, and the value of the first voltage V1 can be set as needed. In this embodiment, the voltage of the DC power supply is 29V, and the first voltage V1 is 3.3V.

[0049] Specifically, the crystal oscillator module E2 includes a first crystal oscillator Y1, a second capacitor C2, and a third capacitor C3. Both ends of the first crystal oscillator Y1 are respectively connected to the first crystal oscillator connection terminal PA6 and the second crystal oscillator connection terminal PA7 of the main control chip MCU. One end of the second capacitor C2 is connected to the first crystal oscillator connection terminal PA6 of the main control chip MCU, and the other end is grounded. One end of the third capacitor C3 is connected to the second crystal oscillator connection terminal PA7 of the main control chip MCU, and the other end is grounded. The first crystal oscillator Y1 and the components inside the main control chip MCU together form an oscillation circuit, thereby generating the clock signal required for the operation of the main control chip MCU.

[0050] Specifically, the control signal receiving module E3 includes a key control unit E31 and a remote control unit E32. The key control unit E31 is connected to the key signal input terminal PA0 of the main control chip MCU. When the user triggers the columnar key 222a, the key control unit E31 acquires and outputs a key signal PA0 to the main control chip MCU.

[0051] The remote control unit E32 includes a radio frequency receiving chip U2, a fourth capacitor C4, a first inductor L1, a second crystal oscillator Y2, and a fifth capacitor C5. The radio frequency receiving end RFIN of the radio frequency receiving chip U2 is connected to an external signal receiving antenna through the fourth capacitor C4. One end of the first inductor L1 is connected to the signal receiving end RFIN of the radio frequency receiving chip U2, and the other end is grounded. The remote control signal output terminal VOUT of the radio frequency receiving chip U2 is connected to the remote control signal input terminal PC5 of the main control chip MCU. The radio frequency receiving chip U2 acquires the radio frequency signal generated by the user operating the remote control through its radio frequency receiving end RFIN, then demodulates the radio frequency signal to obtain a remote control signal, and outputs the remote control signal to the main control chip MCU through its remote control signal output terminal VOUT. The crystal oscillator connection terminal XIN of the radio frequency receiving chip U2 is connected to the second crystal oscillator Y2. One end of the second crystal oscillator Y2 is connected to the crystal oscillator connection terminal XIN of the radio frequency receiving chip U2, and the other end is grounded. The power supply terminal VDD of the radio frequency receiving chip U2 is connected to the first voltage V1. One end of the fifth capacitor C5 is connected to the power supply terminal VDD of the radio frequency receiving chip U2, and the other end is grounded.

[0052] Specifically, the LED driving module E4 includes a first triode TR1, a second triode TR2, a first resistor R1, a second resistor R2, a third resistor R3, a second diode D2, a fourth resistor R4, a fifth resistor R5, a third triode TR3, a fourth triode TR4, a sixth resistor R6, and a seventh resistor R7.

[0053] The first triode TR1 and the second triode TR2 are both NPN-type triodes. The collector of the first triode TR1 is connected to the DC power supply, the base is connected to its collector through the first resistor R1, and the emitter is the first output terminal Lo1. The collector of the second triode TR2 is connected to the DC power supply, the base is connected to its collector through the second resistor R2, and the emitter is the second output terminal Lo2. The first output terminal Lo1 and the second output terminal Lo2 are used to connect to the lamp string body 21. The third resistor R3 is connected across the first output terminal Lo1 and the second output terminal Lo2.

[0054] The cathode of the second diode D2 is connected to the base of the first triode TR1, and the anode is connected to the emitter of the second triode TR2 through the fourth resistor R4. The cathode of the third diode D3 is connected to the base of the second triode TR2, and the anode is connected to the emitter of the first diode TR1 through the fifth resistor R5.

[0055] The third triode TR3 and the fourth triode TR4 are both PNP-type triodes. The emitter of the third triode TR3 is connected to the first output terminal Lo1, the collector is grounded, and the base is connected to the first PMW signal output terminal PA4 of the main control chip MCU through the sixth resistor R6. The emitter of the fourth triode TR4 is connected to the second output terminal Lo2, the collector is grounded, and the base is connected to the second PWM signal output terminal PA2 of the main control chip MCU through the seventh resistor R7. The main control chip MCU controls the current output by the first output terminal Lo1 and the second output terminal Lo2 by controlling the duty cycles of the first PWM signal and the second PWM signal, thereby controlling the lighting effect of the lamp string body 21 connected to the first output terminal Lo1 and the second output terminal Lo2.

[0056] Further, the short-circuit detection pin PC1 of the main control chip MCU is grounded through the eighth resistor R8. The main control chip MCU detects the current of the eighth resistor R8 through the short-circuit detection pin PC1. When the current of the eighth resistor R8 detected is greater than the set short-circuit threshold, it indicates that the circuit may have a short circuit. At this time, the main control chip MCU cuts off the output of the first PWM signal PA4 and the second PWM signal PA2. The power supply terminal VDD of the main control chip MCU is connected to the first voltage V1; one end of the sixth capacitor C6 is connected to the power supply terminal of the main control chip MCU, and the other end is grounded. The main control chip MCU is provided with a first programming terminal PA0 and a second programming terminal PA1 for connecting to the upper computer when programming. The port PA0 serves as the first programming terminal during programming and serves as the key signal input terminal during normal operation.

[0057] In this embodiment, the model of the voltage regulator chip U1 is SE8533, the model of the first diode D1 is SS34, the model of the RF receiving chip U2 is CMT2210LB, the model of the first transistor TR1 and the second transistor TR2 are both B772, the model of the third transistor TR3 and the fourth transistor TR4 are both D882, the model of the second diode D2 and the third diode D3 are both ZMM6V2, and the model of the main control chip MCU is 60s022.

[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 and the driver, thereby improving the installation experience. 2. The user can control the lighting effect of the LED light string through two methods: the foot switch and the remote control, which is suitable for a variety of operating scenarios and more convenient to use. 3. The driver can drive the LED light string to emit white light or colored light, and can drive the breathing flash bubble in the LED light string to achieve breathing flashing, providing a richer and more gorgeous lighting effect and improving the user experience.

[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. A pedal - type LED light string driver, characterized in that, Comprising: A housing and a control board disposed within the housing; A columnar button is provided on the control board; power supply terminals for externally connecting a DC power supply and output terminals for externally connecting the main body of the lamp string are provided at both ends of the control board; When the user triggers the columnar button, the control board receives a button signal, generates a PWM signal according to the button signal, and outputs the PWM signal to the main body of the lamp string.

2. The foot-operated LED lamp string driver according to claim 1, wherein: It further includes a spring and a key cap; an installation hole for installing the key cap is provided at the top of the housing; The spring is sleeved on the columnar button of the control board; the key cap covers the top of the columnar button, abuts against the top of the spring, and protrudes from the installation hole at the top of the housing.

3. The foot-operated LED lamp string driver 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, and an LED driving module; The control signal receiving module includes a button control unit and a remote control unit connected to the main control chip; The button control unit is connected to the columnar button and is used to obtain and output a button signal to the main control chip when the user triggers the columnar button; The remote control unit is used to obtain a radio frequency signal emitted by the remote control when the user operates the remote control, convert the radio frequency signal into a remote control signal, and output it to the main control chip; The main control chip outputs a PWM signal to the LED driving module according to the button signal and / or the remote control signal; The LED driving module drives the externally connected main body of the lamp string to emit light according to the PWM signal.

4. The foot-operated LED lamp string driver according to claim 3, wherein: The circuit further includes a power supply voltage stabilization module and a crystal oscillator 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, so as to supply power to other modules of the circuit; the crystal oscillator module provides a clock signal required for the operation of the main control chip.

5. The foot-operated LED lamp string driver according to claim 4, wherein: The power supply voltage stabilization module includes a first diode, a voltage stabilization chip, and a first capacitor; the anode of the first diode is used to externally connect a DC power supply, and the cathode is connected to the input terminal of the voltage stabilization chip; the grounding terminal of the voltage stabilization chip is grounded, and the output terminal is a first voltage output terminal; one end of the first capacitor is connected to the output terminal of the voltage stabilization chip, and the other end is grounded.

6. The foot-operated LED lamp string driver according to claim 5, wherein: The remote control unit includes a radio frequency receiving chip, a fourth capacitor, a first inductor, a second crystal oscillator, and a fifth capacitor; the radio frequency receiving end of the radio frequency receiving chip is externally connected to a signal receiving antenna through the fourth capacitor; one end of the first inductor is connected to the signal receiving end of the radio frequency receiving chip, and the other end is grounded; the remote control signal output end of the radio frequency receiving chip is connected to the remote control signal input end of the main control chip; the radio frequency receiving chip obtains a radio frequency signal generated by a user operating a remote control through its radio frequency receiving end, then demodulates the radio frequency signal to obtain a remote control signal, and outputs the remote control signal to the main control chip through its remote control signal output end; the crystal oscillator connection end of the radio frequency receiving chip is connected to the second crystal oscillator; one end of the second crystal oscillator is connected to the crystal oscillator connection end of the radio frequency receiving chip, and the other end is grounded; the power supply end of the radio frequency receiving chip is connected to the first voltage; one end of the fifth capacitor is connected to the power supply end of the radio frequency receiving chip, and the other end is grounded.

7. The foot-operated LED light string driver according to claim 6, wherein: The LED driving module includes a first triode, a second triode, a first resistor, a second resistor, a third resistor, a second diode, a fourth resistor, a third diode, a fifth resistor, a third triode, a fourth triode, a sixth resistor, and a seventh resistor; both the first triode and the second triode are NPN-type triodes; the collector of the first triode is externally connected to a DC power supply, the base is connected to its collector through the first resistor, and the emitter is the first output end externally connected to the lamp string body; the collector of the second triode is connected to the DC power supply, the base is connected to its collector through the second resistor, and the emitter is the second output end externally connected to the lamp string body; the third resistor is connected across the first output end and the second output end; the cathode of the second diode is connected to the base of the first triode, and the anode is connected to the emitter of the second triode through the fourth resistor; the cathode of the third diode is connected to the base of the second triode, and the anode is connected to the emitter of the first diode through the fifth resistor; both the third triode and the fourth triode are PNP-type triodes; the emitter of the third triode is connected to the first output end, the collector is grounded, and the base is connected to the first PMW signal output end of the main control chip through the sixth resistor; the emitter of the fourth triode is connected to the second output end, the collector is grounded, and the base is connected to the second PWM signal output end of the main control chip MCU through the seventh resistor.

8. The foot-operated LED light string driver according to claim 7, wherein: The crystal oscillator module includes a first crystal oscillator, a second capacitor, and a third capacitor; both ends of the first crystal oscillator are respectively connected to the first crystal oscillator connection end and the second crystal oscillator connection end of the main control chip; one end of the second capacitor is connected to the first crystal oscillator connection end of the main control chip, and the other end is grounded; one end of the third capacitor is connected to the second crystal oscillator connection end of the main control chip, and the other end is grounded.

9. An LED light string, characterized in that, Comprising: A lamp string body and the foot-operated LED light string driver according to 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 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 foot-operated LED lamp string driver according to 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 lamp string body to drive the lamp string body to emit light.

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