# US 2026/0095992 A1 · Led light string driver, led light string and christmas tree with music playing function

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- Number: US 2026/0095992 A1
- Document ID: US20260095992A1
- Status: Published application
- Kind: A1
- Application number: 19/015,177
- Filed: 2025-01-09
- Published: 2026-04-02
- Earliest claimed: 2024-09-27
- Assignees: Winner Industry Company Limited; Winners Group Industries Company Limited
- Applicants: Winner Industry Company Limited; Winners Group Industries Company Limited
- Inventors: Junhao CAI
- Web page: https://patentgrep.com/patent/US20260095992A1

## CPC

- H05B 47/105: in response to determined parameters
- F21S 4/10: with light sources attached to loose electric cables, e.g. Christmas tree lights
- F21V 23/008: {the casing being outside the housing of the lighting device}
- F21V 23/023: {Power supplies in a casing (F21V23/003 takes precedence)}
- F21V 23/0435: {activated by remote control means}
- F21V 23/06: the elements being coupling devices {, e.g. connectors}
- F21V 33/0056: {Audio equipment, e.g. music instruments, radios or speakers}
- H05B 45/20: Controlling the colour of the light
- H05B 45/325: Pulse-width modulation [PWM]
- H05B 47/155: Coordinated control of two or more light sources
- H05B 47/19: via wireless transmission
- F21Y 2115/10: Light-emitting diodes [LED]
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- F21S: NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21Y: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED

## Abstract

The present application discloses a LED light string driver, a LED light string and a Christmas tree with music playing function. The driver includes a housing, a control board provided in the housing and a speaker; wherein, a power supply terminal of the control board is connected to an external DC power supply, a first output terminal of the control board is connected to a light string body provided externally, a second output terminal of the control board is connected to the speaker; a circuit is provided on the control board; the circuit includes: a master control chip, a LED driving module and a power amplification module electrically connected to the master control chip.

## Claims

### Claim 1

A LED light string driver with music playing function, comprising:
a housing, a control board provided in the housing and a speaker; wherein, a power supply terminal of the control board is connected to an external DC power supply, a first output terminal of the control board is connected to a light string body provided externally, a second output terminal of the control board is connected to the speaker;
a circuit is provided on the control board; the circuit includes: a master control chip, a LED driving module and a power amplification module electrically connected to the master control chip; the master control chip generates a PWM signal and/or a music modulated signal; the LED driving module is electrically connected to the light string body provided externally and drives the light string body to light up according to the PWM signal; the power amplification module is electrically connected to the speaker and drives the speaker to play music according to the music modulated signal;
wherein, the master control chip generates the music modulated signal according to music data;
a music data analysis module is provided in the master control chip, the music data analysis module is configured to obtain an attribute of the music data, then generate a corresponding PWM signal according to the attribute of the music data, so that an effect of a light emitted by the light string body is matched with the attribute of the music data.

### Claim 2 (depends on 1)

The LED light string driver with music playing function of claim 1, wherein,
the attribute of the music data includes a music speed;
the effect of the light emitted by the light string body is matched with the attribute of the music data, specifically including: a flicker frequency of the light emitted by the light string body is matched with the music speed, or a color of the light emitted by the light string body is matched with the music speed.

### Claim 3 (depends on 2)

The LED light string driver with music playing function of claim 2, wherein,
the music data analysis module further includes a music speed calculating unit;
the music speed calculating unit is configured to calculate the music speed according to the music data, and the music speed calculating unit specifically is configured to perform the following steps:
S1, preprocessing the music data to obtain a preprocessed music signal;
S2, detecting beat points of the preprocessed music signal to obtain a plurality of the beat points;
S3, counting the number of the beat points in a preset time period to calculate the music speed according to a length T of the preset time period and the number N of the beat points; wherein a calculation formula of the music speed is:
BPM
=
N
T
,
wherein, BPM represents the music speed, T represents the length of the preset time period, N represents the number of the beat points in the preset time period.

### Claim 4 (depends on 3)

The LED light string driver with music playing function of claim 3, wherein,
S2 specifically includes:
S21, performing a short-time Fourier transform on the preprocessed music signal to obtain a spectrum Xn of a music signal, wherein a calculation formula of the short-time Fourier transform is:
X
n
(
e
j
⁢
ω
)
=
∑
m
=
-
∞
∞
x
⁡
(
m
)
⁢
ω
⁡
(
n
-
m
)
⁢
e
-
j
⁢
ω
⁢
m
,
wherein, Xn(ejω) is the spectrum obtained by the short-time Fourier transform of the music signal x(n), ω(n) is a window function, n is a time scalar;
S22, performing logarithm processing on an amplitude |X| of the spectrum Xn of the music signal to obtain a compressed spectrum Y; wherein a calculation formula of the compressed spectrum is: Y=lg(1+C·|X|),
wherein, Y represents the compressed spectrum, |X| represents the amplitude of the spectrum of the music signal, C is a constant;
S23, calculating a discrete derivative of the compressed spectrum Y to obtain an endpoint intensity curve; wherein a calculation formula of the endpoint intensity curve is:
Δ
⁡
(
t
)
=
∑
k
=
1
K
❘
"\[LeftBracketingBar]"
Y
⁡
(
t
+
1
,
k
)
-
Y
⁡
(
t
,
k
)
❘
"\[RightBracketingBar]"
≥
0
,
t
∈
Z
❘
"\[LeftBracketingBar]"
x
❘
"\[RightBracketingBar]"
≥
0
=
{
x
,
x
≥
0
0
,
x
<
0
,
wherein, Δ(t) represents the endpoint intensity curve, Y represents the compressed spectrum;
S24, extracting peak values of the endpoint intensity curve through calculating an autocorrelation function of the endpoint intensity curve A (t); wherein, points corresponding to the peak values are the beat points.

### Claim 5 (depends on 4)

The LED light string driver with music playing function of claim 4, wherein,
a relationship between the flicker frequency of the light emitted by the light string body and the music speed is represented by the following formula:
f
=
{
a
·
BPM
,
BPM
≤
f
max
a
f
max
,
BPM
>
f
max
,
wherein, f represents the flicker frequency of the light emitted by the light string body, BPM represents the music speed, a represents a preset frequency-speed relation constant, fmax represents a preset maximum value of the flicker frequency of the light emitted by the light string body.

### Claim 6 (depends on 5)

The LED light string driver with music playing function of claim 5, wherein,
a relationship between the color of the light emitted by the light string body and the music speed is represented by the following formula:
H
=
{
0
⁢
°
,
BPM
<
BPM
min
360
⁢
°
·
BPM
-
BPM
min
BPM
max
-
BPM
min
,
BPM
∈
[
BPM
min
,
BPM
max
]
360
⁢
°
,
BPM
>
BPM
max
,
wherein, H represents a hue degree of the color of the light emitted by the light string body in a HSV color space, BPM represents the music speed, BPMmin represents a preset minimum value of an effective range of the music speed, BPMmax represents a preset maximum value of the effective range of the music speed.

### Claim 7 (depends on 1)

The LED light string driver with music playing function of claim 1, further comprising:
a key board provided in the housing; wherein, the key board is electrically connected to the master control chip of the control board;
when a user presses a keycap provided on the housing, the key board obtains a key signal and transmits the key signal to the master control chip;
the master control chip modulates an output of the PWM signal and/or the music modulated signal according to the key signal.

### Claim 8 (depends on 7)

The LED light string driver with music playing function of claim 7, wherein,
the circuit further includes a USB module and a storage module;
the USB module is configured to be connected to an external host computer to obtain the music data transmitted by the external host computer and transmit the music data to the master control chip;
the master control chip processes the music data, then transmits the music data to the storage module for storage;
when playing music is required, the master control chip reads the music data in the storage module and generates the music modulated signal according to the music data.

### Claim 9 (depends on 8)

The LED light string driver with music playing function of claim 8, wherein,
the circuit further includes a Bluetooth antenna;
the Bluetooth antenna is electrically connected to the master control chip and configured to receive a Bluetooth signal sent by the external host computer and transmit the Bluetooth signal to the master control chip;
the Bluetooth signal includes a Bluetooth control signal and the music data;
when playing music is required, the master control chip analyzes the Bluetooth signal to obtain the music data, and generates the music modulated signal according to the music data;
the master control chip modulates the output of the PWM signal and/or the music modulated signal according to the Bluetooth control signal.

### Claim 10 (depends on 9)

The LED light string driver with music playing function of claim 9, wherein,
the circuit further includes a remote control unit;
the remote control unit is electrically connected to the master control chip and configured to receive a remote control signal sent by an external remote controller and transmit the remote control signal to the master control chip;
the master control chip modulates the output of the PWM signal and/or the music modulated signal according to the remote control signal.

### Claim 11 (depends on 10)

The LED light string driver with music playing function of claim 10, wherein,
the number of the LED driving module is three, which are a first LED driving module, a second LED driving module and a third LED driving module;
the master control chip outputs a first PWM signal, a second PWM signal and a third PWM signal to the first LED driving module, the second LED driving module and the third LED driving module, respectively;
the first LED driving module, the second LED driving module and the third LED driving module drive a red light emitting unit, a green light emitting unit and a blue light emitting unit of the light string body according to the first PWM signal, the second PWM signal and the third PWM signal, respectively;
wherein, the first LED driving module includes a fourth diode, a first MOS transistor, a fourth resistor, a fifth capacitor and a fifth diode; an anode of the fourth diode is connected to the first PWM signal, a cathode of the fourth diode is connected to a gate of the first MOS transistor; the first MOS transistor is a NMOS transistor, the gate of the first MOS transistor is connected to the first PWM signal through the fourth diode; a source of the first MOS transistor is connected to the external DC power supply and connected to the gate of the first MOS transistor through the fourth resistor; a drain of the first MOS transistor is connected to the red light emitting unit of the light string body; one end of the fifth capacitor is connected to the source of the first MOS transistor, the other end of the fifth capacitor is grounded; an anode of the fifth diode is connected to a second power supply; a cathode of the fifth diode is connected to the drain of the first MOS transistor.

### Claim 12 (depends on 11)

The LED light string driver with music playing function of claim 11, wherein,
the circuit further includes a power supply voltage stabilizing module;
the power supply voltage stabilizing module includes an enable voltage maintenance unit;
the enable voltage maintenance unit is configured to convert the external DC power supply into an enable voltage; the enable voltage is connected to an enable terminal of the master control chip to prevent the master control chip from resetting;
the enable voltage maintenance unit includes: a first triode, a first resistor, a second resistor, a three-pins voltage regulating tube and a third resistor; a base of the first triode is connected to the enable terminal of the master control chip and serves as an enable voltage output terminal; a collector of the first triode is connected to the external DC power supply through the first resistor, an emitter of the first triode is connected to a first pin of the three-pins voltage regulating tube through the second resistor; a second pin of the three-pins voltage regulating tube is connected to the base of the first triode; a third pin of the three-pins voltage regulating tube is grounded; one end of the third resistor is connected to the first pin of the three-pins voltage regulating tube, the other end of the third resistor is grounded.

### Claim 13 (depends on 12)

The LED light string driver with music playing function of claim 12, wherein,
the power supply voltage stabilizing module includes a first power supply output unit;
the first power supply output unit converts the external DC power supply into a first power supply to supply power to the power amplification module;
the first power supply output unit includes: a first diode, a second diode, a first capacitor and a second capacitor; an anode of the first diode is grounded, a cathode of the first diode is connected to the external DC power supply; an anode of the second diode is connected to the external DC power supply, a cathode of the second diode outputs the first power supply; one end of the first capacitor is connected to the external DC power supply, the other end of the first capacitor is grounded; one end of the second capacitor is connected to the first power supply, the other end is grounded.

### Claim 14 (depends on 13)

The LED light string driver with music playing function of claim 13, wherein,
the power amplification module includes: a power amplification chip, a ninth resistor, a tenth resistor, an eleventh resistor, a ninth capacitor and a twelfth resistor;
a power supply terminal of the power amplification chip is connected to the first power supply, a ground terminal of the power amplification chip is grounded; an enable terminal of the power amplification chip is connected to the first power supply through the ninth resistor and a power amplification enable signal output by the master control chip through the tenth resistor simultaneously;
when playing music is required, the master control chip outputs the power amplification enable signal to the enable terminal of the power amplification chip, so that the power amplification chip enters a working state;
an input terminal of the power amplification chip is connected to the music modulated signal output by the master control chip through the eleventh resistor and the ninth capacitor, a first output terminal and a second output terminal of the power amplification chip are connected to two input terminals of the speaker respectively to drive the speaker to play music;
one end of the twelfth resistor is connected to the input terminal of the power amplification chip, the other end of the twelfth resistor is connected to the first output terminal of the power amplification chip.

### Claim 15 (depends on 1)

A LED light string, comprising: a light string body and the LED light string driver with music playing function of claim 1; wherein, an input terminal of the LED light string driver with music playing function is connected to an external DC power supply, an output terminal of the LED light string driver with music playing function is connected to the light string body to drive the light string body to light up.

### Claim 16 (depends on 1)

A Christmas tree, comprising:
a Christmas tree body and a LED light string wrapped on the Christmas tree body;
wherein, the LED light string includes: a light string body and the LED light string driver with music playing function of claim 1; an input terminal of the LED light string driver with music playing function is connected to an external DC power supply, an output terminal of the LED light string driver with music playing function is connected to the light string body to drive the light string body to light up.