阅读说明：本技术 一种led星星灯电路 (LED star lamp circuit ) 是由 欧阳礼香 于 2021-10-12 设计创作，主要内容包括：本发明涉及电路,尤其涉及一种LED星星灯电路。技术问题：提供一种能够实现通过光转化成电、如此造成投资小和施工工期短的LED星星灯电路。技术方案如下：一种LED星星灯电路,包括有蓄电池、太阳能电池组件、太阳能板充电管理电路、红色LED指示灯、绿色LED指示灯、控制电路、占空比可调方波电路和LED灯板,所述太阳能电池组件输出端和太阳能板充电管理电路输入端连接,所述红色LED指示灯输入端和太阳能板充电管理电路输出端连接。通过温度监测电路,能够检测到电路中的温度,可以防止温度出现过高或者过低的现象,进而导致电路烧坏。(The invention relates to a circuit, in particular to an LED star lamp circuit. The technical problem is as follows: provided is an LED star lamp circuit which can convert light into electricity, and thus has low investment and short construction period. The technical scheme is as follows: the utility model provides a LED star lamp circuit, is including battery, solar module, solar panel charge management circuit, red LED pilot lamp, green LED pilot lamp, control circuit, the adjustable square wave circuit of duty cycle and LED lamp plate, solar module output and solar panel charge management circuit input are connected, red LED pilot lamp input and solar panel charge management circuit output are connected. Through the temperature monitoring circuit, can detect the temperature in the circuit, can prevent that too high or the phenomenon of crossing excessively from appearing in the temperature, and then lead to the circuit to burn out.)

1. An LED star lamp circuit is characterized by comprising a storage battery (1), a solar cell module (3), a solar panel charging management circuit (4), a red LED indicator lamp (5), a green LED indicator lamp (8), a control circuit (9), a duty ratio adjustable square wave circuit (11) and an LED lamp panel (12), wherein the output end of the solar cell module (3) is connected with the input end of the solar panel charging management circuit (4), the input end of the red LED indicator lamp (5) is connected with the output end of the solar panel charging management circuit (4), the output end of the solar panel charging management circuit (4) is connected with the input end of the green LED indicator lamp (8), the output end of the solar panel charging management circuit (4) is connected with the input end of the control circuit (9), the output end of the control circuit (9) is connected with the input end of the duty ratio adjustable square wave circuit (11), the adjustable square wave circuit of duty cycle (11) output and LED lamp plate (12) input are connected, battery (1) is solar module (3), solar panel charge management circuit (4), red LED pilot lamp (5), green LED pilot lamp (8), control circuit (9), the adjustable square wave circuit of duty cycle (11) and LED lamp plate (12) power supply.

2. The LED star lamp circuit according to claim 1, further comprising a thermistor (7) and a temperature monitoring circuit (6), wherein an output end of the thermistor (7) is connected with an input end of the temperature monitoring circuit (6), an output end of the temperature monitoring circuit (6) is connected with an input end of the solar panel charging management circuit (4), and the storage battery (1) supplies power to the thermistor (7) and the temperature monitoring circuit (6).

3. An LED star lamp circuit according to claim 2, characterized in that it further comprises an overshoot voltage suppression circuit (2), the output terminal of the solar cell module (3) is connected with the input terminal of the overshoot voltage suppression circuit (2), the output terminal of the overshoot voltage suppression circuit (2) is connected with the input terminal of the solar panel charging management circuit (4), and the storage battery (1) supplies power to the overshoot voltage suppression circuit (2).

4. An LED star lamp circuit according to claim 3, characterized in that it further comprises a duty-ratio adjustable potentiometer (10), the output end of the duty-ratio adjustable potentiometer (10) is connected with the input end of a duty-ratio adjustable square wave circuit (11), and the storage battery (1) supplies power to the duty-ratio adjustable potentiometer (10).

5. The LED star lamp circuit as claimed in claim 4, wherein the overshoot voltage suppression circuit comprises a diode D1, a capacitor C1 and a resistor R4, wherein the anode of the diode D1 is connected with the solar cell module (3), the cathode of the diode D1 is connected with a capacitor C1, and the capacitor C1 is connected with a resistor R4.

6. An LED star lamp circuit according to claim 5, characterized in that the solar panel charge management circuit (4) comprises a resistor R1, a light emitting diode VD1, a light emitting diode VD2, a capacitor C2 and a lithium battery charge management chip HM4251-U1, wherein 2 pins of the lithium battery charge management chip HM4251-U1 are connected with the resistor R4, 3 pins of the lithium battery charge management chip HM4251-U1, a node between the solar cell module (3) and the resistor R4 is grounded, a node between the resistor R1 and a cathode of the diode D1 is connected with 4 pins of the lithium battery charge management chip HM4251-U1, the resistor R1 is connected with the light emitting diode VD1 and the VD2 in series, 5 pins of the lithium battery charge management chip HM4251-U1 are connected with the capacitor C2, the other end of the capacitor C2 is grounded, and a pin of the lithium battery charge management chip HM4251-U1 is connected with a cathode VD2 pin VD2, and the 7 pins of the lithium battery charging management chip HM4251-U1 are connected with the cathode of the light-emitting diode VD 1.

7. The LED starlight circuit as claimed in claim 6, wherein the temperature monitoring circuit (6) comprises a temperature sensor, a resistor R2, a resistor R3, a resistor R5 and a battery BT1, wherein 8 pins of the lithium battery charging management chip HM4251-U1 are connected with the resistor R2, a node between 5 pins of the lithium battery charging management chip HM4251-U1 and the resistor R2 is connected with the battery BT1, the other end of the battery BT1 is connected with the temperature sensor, a node between 1 pin of the lithium battery charging management chip HM4251-U1 and the resistor R5 is connected with the resistor R3, the resistor R3 is connected with the battery BT1, 4 pins of the lithium battery charging management chip HM4251-U1 are connected with the other end of the resistor R3, and the other end of the resistor R5 is grounded.

8. The LED starlight circuit as claimed in claim 7, wherein the control circuit (9) comprises an electrolytic capacitor EC1, an electrolytic capacitor EC2, a capacitor C4, a capacitor C5 and a low-power-consumption voltage detection chip MD7036-U2, wherein a pin 1 of the low-power-consumption voltage detection chip MD7036-U2 is connected in series with an electrolytic capacitor EC1 and a capacitor C5, a pin 2 of the low-power-consumption voltage detection chip MD7036-U2 is connected in series with an electrolytic capacitor EC2 and a capacitor C4, and nodes among a pin 3 of the low-power-consumption voltage detection chip MD7036-U2, the electrolytic capacitor EC1, the electrolytic capacitor EC2, the capacitor C4 and the capacitor C5 are grounded.

9. An LED star lamp circuit according to claim 8, characterized in that the duty-cycle adjustable square wave circuit (11) comprises an oscillation circuit TCL555-U3, a variable resistor VR1, a diode D2, a resistor R7, a diode D3, an electrolytic capacitor EC3, a resistor R6, a capacitor C3, a resistor R8 and a resistor R9, wherein the 1 pin of the oscillation circuit TCL555-U3 is grounded, a node between the 2 pin and the 6 pin of the oscillation circuit TCL555-U3 is connected in series with a diode D2, a diode D3 and an electrolytic capacitor EC3, the other end of the electrolytic capacitor EC3 is grounded, the cathode of the diode D3 is connected with the resistor R7, the other end of the resistor R7 is connected with a variable resistor VR1, the node between the other end of the variable resistor VR1 and the anode of the diode D2 is connected with the 7 pin of the oscillation circuit TCL 555-U2, and the resistor R2 is connected in series with the resistor R36555-U2, the pin 4 of the oscillating circuit TCL555-U3 is connected with a capacitor C5, the other end of the variable resistor VR1 is connected with a resistor R6, the pin 8 of the oscillating circuit TCL555-U3, the other ends of the resistor R6 and the capacitor C4 are connected with a resistor R3, the pin 5 of the oscillating circuit TCL555-U3 is connected with a capacitor C3, and the other end of the capacitor C3 is grounded.

10. An LED star lamp circuit according to claim 9, characterized in that the LED lamp panel (12) comprises light emitting diodes VD3-VD14, the other end of the resistor R9 is connected in parallel with the common anode of the light emitting diodes VD9-VD14, and the other end of the resistor R8 is connected in parallel with the common anode of the light emitting diodes VD3-VD 8.

Technical Field

The invention relates to a circuit, in particular to an LED star lamp circuit.

Background

In the present society, star lamps are widely applied to mountain lightening and city beautification, but most of the star lamps used at present use municipal power as a power supply, which not only consumes a large amount of municipal power, but also needs to erect a power supply pipeline for a long distance, thus causing large investment, long construction period and large consumption of manpower and material resources.

With the increasing shortage of energy and the continuous development of science and technology, solar energy is gradually mastered and utilized by people, electricity can be directly converted into light, and with the increasing maturity of LED technology, an LED light source becomes an ideal light source to replace a traditional light source, so that an LED star lamp circuit which can convert light into electricity, and is low in investment and short in construction period is developed.

Disclosure of Invention

In order to overcome the defects that the prior LED star lamp not only consumes a large amount of municipal electricity, causes large investment and has long construction period, the technical problem is as follows: provided is an LED star lamp circuit which can convert light into electricity, and thus has low investment and short construction period.

The technical scheme is as follows: the utility model provides a LED star lamp circuit, is including battery, solar module, solar panel charge management circuit, red LED pilot lamp, green LED pilot lamp, control circuit, the adjustable square wave circuit of duty cycle and LED lamp plate, solar module output and solar panel charge management circuit input are connected, red LED pilot lamp input and solar panel charge management circuit output are connected, solar panel charge management circuit output and green LED pilot lamp input are connected, solar panel charge management circuit output and control circuit input are connected, control circuit output and the adjustable square wave circuit input of duty cycle are connected, the adjustable square wave circuit output of duty cycle and LED lamp plate input are connected, the battery is solar module, solar panel charge management circuit, red LED pilot lamp, LED lamp, The LED lamp comprises a green LED indicator lamp, a control circuit, a duty ratio adjustable square wave circuit and an LED lamp panel.

Preferably, the solar battery charging management system further comprises a thermistor and a temperature monitoring circuit, the output end of the thermistor is connected with the input end of the temperature monitoring circuit, the output end of the temperature monitoring circuit is connected with the input end of the solar panel charging management circuit, and the storage battery supplies power to the thermistor and the temperature monitoring circuit.

Preferably, the solar cell module further comprises an overshoot voltage suppression circuit, the output end of the solar cell module is connected with the input end of the overshoot voltage suppression circuit, the output end of the overshoot voltage suppression circuit is connected with the input end of the solar panel charging management circuit, and the storage battery supplies power to the overshoot voltage suppression circuit.

Preferably, the intelligent power supply further comprises a duty ratio adjustable potentiometer, the output end of the duty ratio adjustable potentiometer is connected with the input end of the duty ratio adjustable square wave circuit, and the storage battery supplies power to the duty ratio adjustable potentiometer.

Preferably, the overshoot voltage suppression circuit comprises a diode D1, a capacitor C1 and a resistor R4, wherein the anode of the diode D1 is connected with the solar cell module, the cathode of the diode D1 is connected with the capacitor C1, and the capacitor C1 is connected with the resistor R4.

Preferably, the solar panel charging management circuit comprises a resistor R1, a light emitting diode VD1, a light emitting diode VD2, a capacitor C2 and a lithium battery charging management chip HM4251-U1, the pin 2 of the lithium battery charging management chip HM4251-U1 is connected with the resistor R4, the node among the pin 3 of the lithium battery charging management chip HM4251-U1, the solar battery module and the resistor R4 is grounded, the node between the resistor R1 and the cathode of the diode D1 is connected with the 4 pins of the lithium battery charging management chip HM4251-U1, the resistor R1 is connected in series with the light emitting diodes VD1 and VD2, the 5 pins of the lithium battery charging management chip HM4251-U1 are connected with the capacitor C2, the other end of the capacitor C2 is grounded, the 6 pins of the lithium battery charging management chip HM4251-U1 are connected with the cathode of the light-emitting diode VD2, and the 7 pins of the lithium battery charging management chip HM4251-U1 are connected with the cathode of the light-emitting diode VD 1.

Preferably, the temperature monitoring circuit comprises a temperature sensor, a resistor R2, a resistor R3, a resistor R5 and a battery BT1, wherein 8 pins of the lithium battery charging management chip HM4251-U1 are connected with the resistor R2, a node between 5 pins of the lithium battery charging management chip HM4251-U1 and the resistor R2 is connected with the battery BT1, the other end of the battery BT1 is connected with the temperature sensor, a node between 1 pin of the lithium battery charging management chip HM4251-U1 and the resistor R5 is connected with the resistor R3, the resistor R3 is connected with the battery BT1, 4 pins of the lithium battery charging management chip HM4251-U1 are connected with the other end of the resistor R3, and the other end of the resistor R5 is grounded.

Preferably, the control circuit comprises an electrolytic capacitor EC1, an electrolytic capacitor EC2, a capacitor C4, a capacitor C5 and a low-power consumption voltage detection chip MD7036-U2, wherein a pin 1 of the low-power consumption voltage detection chip MD7036-U2 is connected in series with an electrolytic capacitor EC1 and a capacitor C5, a pin 2 of the low-power consumption voltage detection chip MD7036-U2 is connected in series with an electrolytic capacitor EC2 and a capacitor C4, and nodes among a pin 3 of the low-power consumption voltage detection chip MD7036-U2, the electrolytic capacitor EC1, the electrolytic capacitor EC2, the capacitor C4 and the capacitor C5 are grounded.

Preferably, the square wave circuit with the adjustable duty ratio comprises an oscillating circuit TCL555-U3, a variable resistor VR1, a diode D2, a resistor R7, a diode D3, an electrolytic capacitor EC3, a resistor R6, a capacitor C3, a resistor R8 and a resistor R9, wherein the pin 1 of the oscillating circuit TCL555-U3 is grounded, a node between the pin 2 and the pin 6 of the oscillating circuit TCL555-U3 is connected with a diode D2, a diode D3 and an electrolytic capacitor EC3 in series, the other end of the electrolytic capacitor EC3 is grounded, the cathode of the diode D3 is connected with the resistor R3, the other end of the resistor R3 is connected with the variable resistor VR 3, the node between the other end of the variable resistor VR 3 and the anode of the diode D3 is connected with the pin 7 of the oscillating circuit TCL555-U3, the pin 3 of the oscillating circuit TCL555-U3 is connected with the resistor R3 and the capacitor C3, the other end of the variable resistor VR1 is connected with a resistor R6, the other ends of the 8 pins of the oscillating circuit TCL555-U3, the resistor R6 and the capacitor C4 are connected with a resistor R3, the 5 pins of the oscillating circuit TCL555-U3 are connected with a capacitor C3, and the other end of the capacitor C3 is grounded.

Preferably, the LED lamp panel comprises a light emitting diode VD3-VD14, the other end of the resistor R9 is connected with the common anode of the light emitting diode VD9-VD14 in parallel, and the other end of the resistor R8 is connected with the common anode of the light emitting diode VD3-VD8 in parallel.

The beneficial effects are that: 1. through the temperature monitoring circuit, can detect the temperature in the circuit, can prevent that too high or the phenomenon of crossing excessively from appearing in the temperature, and then lead to the circuit to burn out.

2. The red LED indicating lamp is turned on, so that people can be reminded that the storage battery is being charged, and the green LED indicating lamp is turned on to remind people of finishing charging the storage battery.

Drawings

FIG. 1 is a block diagram of the circuit of the present invention.

Fig. 2 is a schematic circuit diagram of the present invention.

Reference numerals: 1_ battery, 2_ voltage suppression circuit that overshoots, 3_ solar module, 4_ solar panel charge management circuit, 5_ red LED pilot lamp, 6_ temperature monitoring circuit, 7_ thermistor, 8_ green LED pilot lamp, 9_ control circuit, 10_ adjustable potentiometer of duty cycle, 11_ adjustable square wave circuit of duty cycle, 12_ LED lamp plate.

Detailed Description

The invention is further described with reference to the following figures and detailed description.

Example 1

An LED star lamp circuit is shown in figures 1-2 and comprises a storage battery 1, a solar cell module 3, a solar panel charging management circuit 4, a red LED indicator lamp 5, a green LED indicator lamp 8, a control circuit 9, a duty ratio adjustable square wave circuit 11 and an LED lamp panel 12, wherein the output end of the solar cell module 3 is connected with the input end of the solar panel charging management circuit 4, the input end of the red LED indicator lamp 5 is connected with the output end of the solar panel charging management circuit 4, the output end of the solar panel charging management circuit 4 is connected with the input end of the green LED indicator lamp 8, the output end of the solar panel charging management circuit 4 is connected with the input end of the control circuit 9, the output end of the control circuit 9 is connected with the input end of the duty ratio adjustable square wave circuit 11, the output end of the duty ratio adjustable square wave circuit 11 is connected with the input end of the LED lamp panel 12, the storage battery 1 supplies power for the solar battery assembly 3, the solar panel charging management circuit 4, the red LED indicator lamp 5, the green LED indicator lamp 8, the control circuit 9, the duty ratio adjustable square wave circuit 11 and the LED lamp panel 12.

Under the action of the solar cell module 3, sunlight is converted into electric power, the electric power is input into the storage battery 1, the storage battery 1 is charged, the red LED indicator lamp 5 is turned on at the moment, if the storage battery 1 is charged, the red LED indicator lamp 5 is automatically turned off, the green LED indicator lamp 8 is turned on, and if the red LED indicator lamp 5 and the green LED indicator lamp 8 are both turned off, the charging circuit is abnormal; at night, the storage battery 1 starts to work, the solar panel charging management circuit 4 is controlled to work, the solar panel charging management circuit 4 controls the control circuit 9 to work, the control circuit 9 controls the duty ratio adjustable square wave circuit 11 to work, the duty ratio adjustable square wave circuit 11 controls the LED lamp panel 12 to work, so that the LED lamp panel 12 is lighted, the LED lamp panel 12 intermittently flickers, and when the storage battery 1 is electrified or in the daytime, the storage battery 1 is being charged, the LED lamp panel 12 automatically extinguishes.

Still including thermistor 7 and temperature monitoring circuit 6, thermistor 7 output and temperature monitoring circuit 6 input are connected, 6 outputs of temperature monitoring circuit and the input of solar panel charging management circuit 4 are connected, battery 1 is the power supply of thermistor 7 and temperature monitoring circuit 6.

Under the action of the thermistor 7 and the temperature monitoring circuit 6, if the temperature is detected to exceed the rated value, the charging is suspended, and if the temperature is detected to be kept between the rated values, the charging is continued, so that the phenomenon that the temperature is too high or too low can be prevented, and the circuit is burnt out.

The solar battery pack charging management circuit further comprises an overshoot voltage suppression circuit 2, the output end of the solar battery pack 3 is connected with the input end of the overshoot voltage suppression circuit 2, the output end of the overshoot voltage suppression circuit 2 is connected with the input end of the solar panel charging management circuit 4, and the storage battery 1 supplies power for the overshoot voltage suppression circuit 2.

The overshoot voltage suppression circuit 2 can prevent the voltage of the solar cell module 3 from being overcharged, and avoid the phenomenon of circuit burnout.

The adjustable potentiometer with the duty ratio further comprises a duty ratio adjustable potentiometer 10, the output end of the duty ratio adjustable potentiometer 10 is connected with the input end of a duty ratio adjustable square wave circuit 11, and the storage battery 1 supplies power to the duty ratio adjustable potentiometer 10.

By adjusting the duty ratio adjustable potentiometer 10, the flicker frequency of the LED lamp panel 12 can be adjusted.

The overshoot voltage suppression circuit comprises a diode D1, a capacitor C1 and a resistor R4, wherein the anode of the diode D1 is connected with the solar cell module 3, the cathode of the diode D1 is connected with a capacitor C1, and the capacitor C1 is connected with a resistor R4.

Through the cooperation between diode D1, electric capacity C1 and resistance R4, can prevent that solar module 3 voltage from overcharging, the phenomenon of avoiding the circuit to burn out appears.

The solar panel charging management circuit 4 comprises a resistor R1, a light emitting diode VD1, a light emitting diode VD2, a capacitor C2 and a lithium battery charging management chip HM4251-U1, the pin 2 of the lithium battery charging management chip HM4251-U1 is connected with the resistor R4, the node between the pin 3 of the lithium battery charging management chip HM4251-U1, the solar cell module 3 and the resistor R4 is grounded, the node between the resistor R1 and the cathode of the diode D1 is connected with the 4 pins of the lithium battery charging management chip HM4251-U1, the resistor R1 is connected in series with the light emitting diodes VD1 and VD2, the 5 pins of the lithium battery charging management chip HM4251-U1 are connected with the capacitor C2, the other end of the capacitor C2 is grounded, the 6 pins of the lithium battery charging management chip HM4251-U1 are connected with the cathode of the light-emitting diode VD2, and the 7 pins of the lithium battery charging management chip HM4251-U1 are connected with the cathode of the light-emitting diode VD 1.

Under the action of the solar cell module 3, sunlight is converted into electric power, the electric power is input into the storage battery 1, the storage battery 1 is charged, the light-emitting diode VD2 is lightened, if the storage battery 1 is charged, the light-emitting diode VD2 is automatically extinguished, the light-emitting diode VD1 is lightened, and if the light-emitting diode VD1 and the light-emitting diode VD2 are both extinguished, the charging circuit is abnormal.

The temperature monitoring circuit 6 comprises a temperature sensor, a resistor R2, a resistor R3, a resistor R5 and a battery BT1, wherein 8 pins of the lithium battery charging management chips HM4251-U1 are connected with the resistor R2, a node between 5 pins of the lithium battery charging management chips HM4251-U1 and the resistor R2 is connected with the battery BT1, the other end of the battery BT1 is connected with the temperature sensor, a node between 1 pin of the lithium battery charging management chips HM4251-U1 and the resistor R5 is connected with the resistor R3, the resistor R3 is connected with the battery BT1, 4 pins of the lithium battery charging management chips HM4251-U1 are connected with the other end of the resistor R3, and the other end of the resistor R5 is grounded.

Through resistance R3, resistance R5 and temperature sensor, if detect the temperature and be less than 45% input voltage, when being higher than 80% input voltage, charge and suspend, if detect when between 45% input voltage and 80% input voltage, charge and continue, so can prevent that the temperature from appearing too high or too low phenomenon, and then lead to the circuit to burn out.

The control circuit 9 comprises an electrolytic capacitor EC1, an electrolytic capacitor EC2, a capacitor C4, a capacitor C5 and a low-power consumption voltage detection chip MD7036-U2, wherein a pin 1 of the low-power consumption voltage detection chip MD7036-U2 is connected in series with an electrolytic capacitor EC1 and a capacitor C5, a pin 2 of the low-power consumption voltage detection chip MD7036-U2 is connected in series with an electrolytic capacitor EC2 and a capacitor C4, and nodes among a pin 3 of the low-power consumption voltage detection chip MD7036-U2, the electrolytic capacitor EC1, the electrolytic capacitor EC2, the capacitor C4 and the capacitor C5 are grounded.

The square wave circuit 11 with the adjustable duty ratio comprises an oscillating circuit TCL555-U3, a variable resistor VR1, a diode D2, a resistor R7, a diode D3, an electrolytic capacitor EC3, a resistor R6, a capacitor C3, a resistor R8 and a resistor R9, wherein a pin 1 of the oscillating circuit TCL 555-U9 is grounded, a node between a pin 2 and a pin 6 of the oscillating circuit TCL 555-U9 is connected in series with the diode D9, the diode D9 and the electrolytic capacitor EC 9, the other end of the electrolytic capacitor EC 9 is grounded, a cathode of the diode D9 is connected with the resistor R9, the other end of the resistor R9 is connected with the variable resistor VR 9, a node between the other end of the variable resistor VR 9 and an anode of the diode D9 is connected with a pin 7 of the oscillating circuit TCL 555-U9, a pin 3 of the oscillating circuit TCL 555-U9 is connected with the resistor VR 9 and the variable resistor VR 9, the other end of the oscillating circuit VR 9 is connected with the variable resistor VR 9 and the variable resistor VR 9, the other ends of the 8 pins, the resistor R6 and the capacitor C4 of the oscillating circuit TCL555-U3 are connected with the resistor R3, the 5 pins of the oscillating circuit TCL555-U3 are connected with the capacitor C3, and the other end of the capacitor C3 is grounded.

The LED lamp panel 12 comprises a light emitting diode VD3-VD14, the other end of the resistor R9 is connected with the common anode of the light emitting diode VD9-VD14 in parallel, and the other end of the resistor R8 is connected with the common anode of the light emitting diode VD3-VD8 in parallel.

If the voltage is higher than 3.6V, the light-emitting diodes VD3-VD14 are in a working state, the duty ratio can be adjusted to be 8.3 at the top, 91.7 at the bottom and 90% from 8%, and therefore the flicker of the light-emitting diodes VD3-VD14 can be adjusted.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.