阅读说明：本技术 一种带保护装置的led驱动电路 (LED drive circuit with protection device ) 是由 龙凤英 于 2021-08-23 设计创作，主要内容包括：本发明公开了一种带保护装置的LED驱动电路,包括：主控模块、电源模块、RS485模块、温度检测模块、风扇驱动模块、显示模块和保护驱动模块,所述主控模块包括芯片U1和外围电路,所述电源模块为整个系统提供稳定的12V和3.3V电源,所述RS485模块与所述主控模块的通讯口相连,可外接DMX控制器,所述温度检测模块与所述主控模块的输入口相连,可检测LED的温度状况,所述风扇驱动模块由所述主控模块控制,可驱动风扇,所述显示模块与所述主控的输出口相连,所述保护驱动模块可驱动LED照明工作；本发明具有过压过流保护,并可通过检测温度来调控风扇的散热强度,保证LED不会因为温度过高而损坏,具有良好的市场应用价值。(The invention discloses an LED drive circuit with a protection device, which comprises: the LED lighting system comprises a main control module, a power supply module, an RS485 module, a temperature detection module, a fan driving module, a display module and a protection driving module, wherein the main control module comprises a chip U1 and a peripheral circuit, the power supply module provides stable 12V and 3.3V power for the whole system, the RS485 module is connected with a communication port of the main control module and can be externally connected with a DMX controller, the temperature detection module is connected with an input port of the main control module and can detect the temperature condition of an LED, the fan driving module is controlled by the main control module and can drive a fan, the display module is connected with an output port of the main control module, and the protection driving module can drive the LED to work; the LED lamp has overvoltage and overcurrent protection, can regulate and control the heat dissipation strength of the fan by detecting the temperature, ensures that the LED cannot be damaged due to overhigh temperature, and has good market application value.)

1. An LED drive circuit with a protection device, comprising: host system, power module, RS485 module, temperature detection module, fan drive module, display module and protection drive module, host system includes chip U1 and peripheral circuit, power module provides stable 12V and 3.3V power for entire system, RS485 module with host system's communication port links to each other, can external DMX controller, temperature detection module with host system's input port links to each other, detectable LED's temperature situation, fan drive module by host system control can drive the fan, display module with the delivery outlet of master control links to each other, but display system operating mode and the temperature numerical value of LED device, protection drive module can drive LED work to overflow and overvoltage protection function have.

2. The LED driving circuit with the protection device according to claim 1, wherein a crystal oscillator Y1 is connected between 6 pins and 7 pins of the chip U1, two ends of the crystal oscillator Y1 are grounded through capacitors C3 and C9 respectively, 1, 9, 24, 36 and 48 pins of the chip U1 are connected with a 3.3V power supply, pins 8, 35 and 47 of the chip U1 are grounded, a 44 pin is grounded through a resistor R3, filter capacitors C4, C5, C6 and C7 are arranged between the 3.3V power supply and the ground, and the model of the chip U1 is STM32F334C8T 6.

3. The LED driving circuit with protection device as claimed in claim 1, wherein the peripheral circuit comprises a reset circuit, an interface circuit and a key circuit, the reset circuit comprises a reset key K1, a 1 pin of the reset key K1 is grounded, a first lead of a 2 pin of the reset key K1 is grounded via a capacitor C1, a second lead is connected with a 3.3V power supply via a resistor R2, a third lead is connected with an 8 pin of the chip U1, and a capacitor C2 is connected in parallel at two ends of the reset key K1; the interface circuit comprises a connector J1, pins 1 and 2 of the connector J1 are respectively connected with pins 37 and 34 of the chip U1, pin 3 of the connector J1 is grounded, pin 4 is connected with a 3.3V power supply, the key circuit comprises an adjusting interface K3 and keys K2 and K4, a first lead of pin 1 of the adjusting interface K3 is connected with the 3.3V power supply through a resistor R26, a second lead is grounded through a C39, a third lead is connected with pin 31 of the chip U1, pins 2 and 4 of the adjusting interface K3 are grounded, a first lead of pin 3 of the adjusting interface K3 is connected with the 3.3V power supply through a resistor R25, a second lead is grounded through a capacitor C38, a third lead is connected with pin 32 of the chip U1, a first lead of pin 5 of the adjusting interface K3 is grounded through a lead C37, a second lead is connected with pin 33 of the chip U1, and a pin 1 and a pin 462 of the key K1 of the adjusting interface K3 are connected with the chip U15, the capacitor C36 is connected in parallel at two ends of the key K2, a pin 1 of the key K4 is grounded, a pin 2 is connected with a pin 14 of the chip U1, and the capacitor C41 is connected in parallel at two ends of the key K4.

4. The LED driving circuit with protection device as claimed in claim 1, wherein the power module comprises a first power conversion circuit and a second power conversion circuit, the first power conversion circuit comprises a chip U3, the 1 pin of the chip U3 is connected to the 10 pin of the chip U3 through a capacitor C21, the first lead of the 2 pin of the chip U3 is connected to the first end of a resistor R16, the second lead is connected to a 24V power supply through a diode D2, capacitors C26, C29 and C30 are connected in parallel and are disposed between the 2 pin of the chip U3 and ground, the second end of the resistor R16 is connected to ground through a resistor R22, the first lead of the 4 pin of the chip U3 is connected to the second end of the resistor R16, the second lead is connected to ground through a capacitor C27, the 5 pin of the chip U3 is connected to ground through a resistor R20, the 9 and 11 pins are connected to ground, the 6 pin of the U1 is connected to the first lead of the chip U368, and the first lead of the chip U3 is connected to ground through a capacitor C28 pin of the capacitor C493, the second lead is grounded through a resistor R18 and a capacitor C31, the first lead of the 10 pins of the chip U3 is grounded through a diode D3, the second lead is connected with the 1 pin of an inductor L3, the first lead of the 2 pins of the inductor L3 is connected with a 12 power supply, the second lead is connected with the first end of a resistor R17, the first lead of the second end of the resistor R17 is connected with the 7 pin of the chip U3, the second lead is grounded through a resistor R21, capacitors C25, C22, C23 and C24 are connected in parallel and then arranged between the 12V power supply and the ground, the resistor R19 and a light emitting diode LED1 are connected in series and then arranged between the 12V power supply and the ground, the model of the chip U3 is TPS54160, the second power conversion circuit comprises a chip U4, the 1 pin of the chip U4 is grounded, the 5 pins are connected with the 12V power supply, the first lead of the 3 pins of the chip U4 is connected with the 12V power supply, the second lead is connected with the ground through a capacitor C8656, the first lead of the chip U82 32 of the chip U2 pin of the capacitor C862, the second lead is connected with the first end of an inductor L4, the first lead of the second end of the inductor L4 is connected with a 3.3V power supply, the second lead is connected with the first end of a resistor R23, the first lead of the second end of the resistor R23 is connected with a 4-pin of the chip U4, the second lead is grounded through a resistor R24, capacitors C33 and C34 are connected in parallel and then are arranged between the 3.3V power supply and the ground, and the model of the chip U4 is TPS 562200.

5. The LED driving circuit with protection device as claimed in claim 1, wherein said RS485 module comprises a chip U5, a connector RS1 and an inductor L5, wherein 1 pin of said inductor L5 is connected to 3.3V power supply, 3 and 2 pins of said chip U5 are connected, 1, 2 and 4 pins of said chip U5 are respectively connected to 43, 42 and 41 pins of said chip U1, a first pin of 5 pins of said chip U5 is connected to 3 pins of said connector RS1, a second pin is connected to ground, a first pin of 6 pins of said chip U5 is connected to 2 pins of said connector RS1 through a resistor R28, a second pin is connected to 2 pins of said inductor L5 through a resistor R27, a first pin of 7 pins of said chip U5 is connected to 1 pin of said connector RS1 through a resistor R29, a second pin is connected to ground through a resistor R30, and a first pin of 8 pins of said chip U5 is connected to 2 pins of said inductor L5 pins of said inductor L1, the second lead is grounded through a capacitor C40, and the model of the chip U5 is RS 485.

6. The LED driving circuit with protection device as claimed in claim 1, wherein the temperature detection module comprises a connector J4 and a thermistor R36, a first lead of 1 pin of the connector J4 is connected to 3.3V power supply via a resistor R31, a second lead is connected to ground via a capacitor C47, a third lead is connected to 13 pins of the chip U1 via a resistor R32, a 2 pin of the connector J4 is connected to ground, a first lead of a first end of the thermistor R36 is connected to 3.3V power supply via a resistor R34, a second lead is connected to ground via a capacitor C49, a third lead is connected to 12 pins of the chip U1 via a resistor R35, and a second end of the thermistor R36 is connected to ground.

7. The LED driving circuit with protection device as claimed in claim 1, wherein said fan driving module comprises MOS transistors Q3 and Q4, a first pin of 1 pin of said MOS transistor Q3 is grounded via a resistor R33, a second pin is connected to 26 pin of said chip U1, a 2 pin of said MOS transistor Q3 is grounded, a 3 pin is connected to 1 pin of a connector J3, a 2 pin of said connector J3 is connected to 12V power supply, a capacitor C46 is disposed between 1 and 2 pins of said connector J3, a first pin of 1 pin of said MOS transistor Q4 is grounded via a resistor R37, a second pin is connected to 27 pin of said chip U1, a 2 pin of said MOS transistor Q4 is grounded, a 3 pin is connected to 1 pin of a connector J5, a 2 pin of said connector J5 is connected to 12V power supply, and a capacitor C48 is disposed between 1 and 2 pins of said connector J5.

8. The LED driving circuit with protection device of claim 1, wherein the display module comprises a display interface LCD1, pins 1 and 7 of the display interface LCD1 are connected with a 3.3V power supply, capacitors C43 and C45 are respectively arranged between the 3.3V power supply and the ground, pins 2 and 6 of the display interface LCD1 are connected with the ground, pin 3 is connected with the ground through a capacitor C42, and pins 8, 9, 10, 11 and 12 of the display interface LCD1 are respectively connected with pins 46, 45, 22, 21 and 20 of the chip U1.

9. The LED driving circuit with protection device according to claim 1, wherein the protection driving module comprises a chip U2, a first lead of 8 pins of the chip U2 is connected to 25 pins of the chip U1 through a resistor R1, a second lead is connected to ground through a resistor R13, 6 and 7 pins of the chip U2 are connected, 5 pins are connected to ground through a resistor R10 and a capacitor C19, 11 pins are connected to ground through a resistor R9, 10 pins are connected to ground through a capacitor C18, a first lead of 12 pins of the chip U2 is connected to ground through a resistor R6, a second lead is connected to a first end of a fuse F1 through a resistor R4, a second end of the fuse F1 is connected to a 24V power supply, a first lead of 14 pins of the chip U2 is connected to a first end of the fuse F1, a second lead is connected to a first end of an inductor L2, and capacitors C10, C11, C12 and C13 are connected in parallel to a first end of the chip U368747, a first end of the inductor L1 and a first end of the inductor L2 pin 1, a second lead is connected with a drain of a MOS transistor Q1, a second terminal of the diode D1 is connected with a first terminal of a resistor R5, capacitors C14, C15, C16 and C17 are connected in parallel and then are arranged between a second terminal of the diode D1 and the ground, a gate of the MOS transistor Q1 is connected with a 16-pin of the chip U2, a first lead of a source of the MOS transistor Q1 is connected with a 15-pin of the chip U2, a second lead is connected with the ground through a resistor R8, a first lead of a 2-pin of the chip U2 is connected with a second terminal of the diode D1 through a resistor R7, a second lead is connected with the ground through a resistor R1, a 4-pin of the chip U1 is connected with a first terminal of the resistor R1, a first lead of a 3-pin of the chip U1 is connected with a second terminal of the resistor R1, a second lead is connected with a 1-pin of the J1, a 1-pin of the chip U1 is connected with a gate of the MOS transistor Q1 through a resistor R1, a gate of the MOS transistor Q1, and a gate of the transistor Q1, the drain electrode of the MOS tube Q2 is connected with the 2 pin of the connector J2, the 9 pin of the chip U2 is connected with the 13 pin of the chip U2 through a resistor R11, the 13 pin of the chip U2 is grounded through a capacitor C20, and the model of the chip U2 is LT 3756.

Technical Field

The invention relates to the technical field of LED lighting, in particular to an LED driving circuit with a protection device.

Background

The LED is a light emitting diode, is a solid semiconductor device capable of converting electric energy into visible light, can directly convert electricity into light, and has the advantages of environmental protection, energy conservation, long service life, convenient transportation and the like.

Disclosure of Invention

The invention provides an LED drive circuit with a protection device, aiming at the defects of the existing LED drive circuit.

The technical scheme adopted by the invention for solving the technical problems is as follows:

provided is an LED drive circuit with a protection device, comprising: host system, power module, RS485 module, temperature detection module, fan drive module, display module and protection drive module, host system includes chip U1 and peripheral circuit, power module provides stable 12V and 3.3V power for entire system, RS485 module with host system's communication port links to each other, can external DMX controller, temperature detection module with host system's input port links to each other, detectable LED's temperature situation, fan drive module by host system control can drive the fan, display module with the delivery outlet of master control links to each other, but display system operating mode and the temperature numerical value of LED device, protection drive module can drive LED work to overflow and overvoltage protection function have.

Further, a crystal oscillator Y1 is connected between 6 pins and 7 pins of the chip U1, two ends of the crystal oscillator Y1 are grounded through capacitors C3 and C9, pins 1, 9, 24, 36 and 48 of the chip U1 are connected to a 3.3V power supply, pins 8, 35 and 47 of the chip U1 are grounded, a pin 44 is grounded through a resistor R3, filter capacitors C4, C5, C6 and C7 are arranged between the 3.3V power supply and the ground, and the model of the chip U1 is STM32F334C8T 6.

Furthermore, the peripheral circuit comprises a reset circuit, an interface circuit and a key circuit, the reset circuit comprises a reset key K1, a 1 pin of the reset key K1 is grounded, a first lead of a 2 pin of the reset key K1 is grounded through a capacitor C1, a second lead is connected with a 3.3V power supply through a resistor R2, a third lead is connected with an 8 pin of the chip U1, and a capacitor C2 is connected in parallel at two ends of the reset key K1; the interface circuit comprises a connector J1, pins 1 and 2 of the connector J1 are respectively connected with pins 37 and 34 of the chip U1, pin 3 of the connector J1 is grounded, pin 4 is connected with a 3.3V power supply, the key circuit comprises an adjusting interface K3 and keys K2 and K4, a first lead of pin 1 of the adjusting interface K3 is connected with the 3.3V power supply through a resistor R26, a second lead is grounded through a C39, a third lead is connected with pin 31 of the chip U1, pins 2 and 4 of the adjusting interface K3 are grounded, a first lead of pin 3 of the adjusting interface K3 is connected with the 3.3V power supply through a resistor R25, a second lead is grounded through a capacitor C38, a third lead is connected with pin 32 of the chip U1, a first lead of pin 5 of the adjusting interface K3 is grounded through a lead C37, a second lead is connected with pin 33 of the chip U1, and a pin 1 and a pin 462 of the key K1 of the adjusting interface K3 are connected with the chip U15, the capacitor C36 is connected in parallel at two ends of the key K2, a pin 1 of the key K4 is grounded, a pin 2 is connected with a pin 14 of the chip U1, and the capacitor C41 is connected in parallel at two ends of the key K4.

Further, the power module comprises a first power conversion circuit and a second power conversion circuit, the first power conversion circuit comprises a chip U3, a 1 pin of the chip U3 is connected with a 10 pin of the chip U3 through a capacitor C21, a 2 pin first lead of the chip U3 is connected with a first end of a resistor R16, a second lead is connected with a 24V power supply through a diode D2, capacitors C26, C29 and C30 are connected in parallel and then arranged between the 2 pin of the chip U3 and the ground, a second end of the resistor R16 is connected with the ground through a resistor R22, a 4 pin first lead of the chip U3 is connected with a second end of the resistor R16, a second lead is connected with the ground through a capacitor C27, a 5 pin of the chip U3 is connected with the ground through a resistor R20, pins 9 and 11 are connected with the ground, a 6 pin is connected with a 11 pin of the chip U1, a 8 pin first lead of the chip U3 is connected with the ground through a capacitor C42, a second lead is connected with the ground through a capacitor C5928 and a resistor C599, the first lead of the 10 pins of the chip U3 is grounded through a diode D3, the second lead is connected with the 1 pin of an inductor L3, the first lead of the 2 pins of the inductor L3 is connected with a 12 power supply, the second lead is connected with the first end of a resistor R17, the first lead of the second end of the resistor R17 is connected with the 7 pin of the chip U3, the second lead is grounded through a resistor R21, capacitors C25, C22, C23 and C24 are connected in parallel and then arranged between the 12V power supply and the ground, the resistor R19 and the light emitting diode LED1 are connected in series and then arranged between the 12V power supply and the ground, the model of the chip U3 is 54160, the second power conversion circuit comprises a chip U4, the 1 pin of the chip U4 is grounded, the 5 pin is connected with the 12V power supply, the first lead of the 3 pin of the chip U4 is connected with the 12V power supply, the second lead is grounded through a capacitor C35, the first lead 5732 pin of the chip U32 is connected with the chip U4, the second lead is connected with the first end of an inductor L4, the first lead of the second end of the inductor L4 is connected with a 3.3V power supply, the second lead is connected with the first end of a resistor R23, the first lead of the second end of the resistor R23 is connected with a 4-pin of the chip U4, the second lead is grounded through a resistor R24, capacitors C33 and C34 are connected in parallel and then are arranged between the 3.3V power supply and the ground, and the model of the chip U4 is TPS 562200.

Further, the RS485 module includes a chip U5, a connector RS1 and an inductor L5, wherein 1 pin of the inductor L5 is connected to a 3.3V power supply, 3 and 2 pins of the chip U5 are connected, 1, 2 and 4 pins of the chip U5 are respectively connected to 43, 42 and 41 pins of the chip U1, a first lead of 5 pins of the chip U5 is connected to 3 pins of the connector RS1, a second lead is grounded, a first lead of 6 pins of the chip U5 is connected to 2 pins of the connector RS1 through a resistor R28, a second lead is connected to 2 pins of the inductor L27 through a resistor R27, a first lead of 7 pins of the chip U5 is connected to 1 pin of the RS connector 1 through a resistor R29, a second lead is grounded through a resistor R30, and a first lead of 8 pins of the chip 5 is connected to 2 pins of the inductor L5, a second lead is connected to the ground through a capacitor C40, and the chip is connected to the model number of the chip RS 57324.

Furthermore, the temperature detection module comprises a connector J4 and a thermistor R36, wherein a first lead of a 1 pin of the connector J4 is connected with a 3.3V power supply through a resistor R31, a second lead is grounded through a capacitor C47, a third lead is connected with a 13 pin of the chip U1 through a resistor R32, a 2 pin of the connector J4 is grounded, a first lead of a first end of the thermistor R36 is connected with a 3.3V power supply through a resistor R34, a second lead is grounded through a capacitor C49, a third lead is connected with a 12 pin of the chip U1 through a resistor R35, and a second end of the thermistor R36 is grounded.

Further, the fan driving module comprises MOS transistors Q3 and Q4, a first lead of a 1 pin of MOS transistor Q3 is grounded through a resistor R33, a second lead is connected with a 26 pin of the chip U1, a 2 pin of MOS transistor Q3 is grounded, a 3 pin is connected with a 1 pin of a connector J3, a 2 pin of the connector J3 is connected with a 12V power supply, a capacitor C46 is arranged between the 1 and 2 pins of the connector J3, a first lead of a 1 pin of MOS transistor Q4 is grounded through a resistor R37, a second lead is connected with a 27 pin of the chip U1, a 2 pin of MOS transistor Q4 is grounded, a 3 pin is connected with a 1 pin of the connector J5, a 2 pin of the connector J5 is connected with a 12V power supply, and a capacitor C48 is arranged between the 1 and 2 pins of the connector J5.

Further, the display module comprises a display interface LCD1, pins 1 and 7 of the display interface LCD1 are connected with a 3.3V power supply, capacitors C43 and C45 are respectively arranged between the 3.3V power supply and the ground, pins 2 and 6 of the display interface LCD1 are connected with the ground, a pin 3 is connected with the ground through a capacitor C42, and pins 8, 9, 10, 11 and 12 of the display interface LCD1 are respectively connected with pins 46, 45, 22, 21 and 20 of the chip U1.

Further, the protection driving module includes a chip U2, a first lead of an 8-pin of the chip U2 is connected to a 25-pin of the chip U1 through a resistor R1, a second lead is connected to ground through a resistor R13, pins 6 and 7 of the chip U2 are connected, a 5-pin is connected to ground through a resistor R10 and a capacitor C19, a 11-pin is connected to ground through a resistor R9, a 10-pin is connected to ground through a capacitor C18, a first lead of a 12-pin of the chip U2 is connected to ground through a resistor R6, a second lead is connected to a first end of a fuse F1 through a resistor R4, a second end of the fuse F1 is connected to a 24V power supply, a first lead of a 14-pin of the chip U2 is connected to a first end of the fuse F1, a second lead is connected to a first end of an inductor L2, capacitors C10, C11, C12 and C13 are connected in parallel and then disposed between a 14-pin of the chip U13 and a second end of the inductor L13, a drain of a second lead of the MOS 13, the second end of the diode D1 is connected with the first end of a resistor R5, capacitors C14, C15, C16 and C17 are connected in parallel and then are arranged between the second end of the diode D1 and the ground, the gate of the MOS transistor Q1 is connected with the 16 pin of the chip U2, the first lead of the source of the MOS transistor Q1 is connected with the 15 pin of the chip U2, the second lead is connected with the ground through a resistor R8, the first lead of the 2 pin of the chip U2 is connected with the second end of the diode D1 through a resistor R7, the second lead is connected with the ground through a resistor R12, the 4 pin of the chip U2 is connected with the first end of the resistor R5, the first lead of the 3 pin of the chip U2 is connected with the second end of the resistor R2, the second lead is connected with the 1 pin of the connector J2, the 1 pin of the chip U2 is connected with the gate of the MOS transistor Q2 through a resistor R2, the source of the MOS transistor Q2, and the gate of the second lead 2 are connected with the gate of the transistor Q2, the drain electrode of the MOS tube Q2 is connected with the 2 pin of the connector J2, the 9 pin of the chip U2 is connected with the 13 pin of the chip U2 through a resistor R11, the 13 pin of the chip U2 is grounded through a capacitor C20, and the model of the chip U2 is LT 3756.

Compared with the prior art, the invention has the beneficial effects that:

1. the temperature detection module can detect the temperature conditions of the LED and the protection driving module in real time to adjust the heat dissipation strength of the fan, so that a good heat dissipation effect is achieved, and the LED and the protection driving module work at proper temperature;

2. the protection driving module has an overvoltage and overcurrent protection function and can protect the LED from running stably in real time;

3. the RS485 module can be externally connected with a DMX controller, and networking control can be realized through the DMX controller, so that large-scale deployment and centralized control of the LED device are facilitated;

4. the equipment can be controlled in various modes, not only can be controlled by a key module in the circuit, but also can be controlled by external equipment;

5. the LED lamp is provided with the display module, and the display screen can display the working mode of the system and the temperature value of the lamp, so that a user can know the working state of the LED conveniently.

Drawings

FIG. 1 is a schematic diagram of a principle structure of a main control module according to the present invention;

FIG. 2 is a schematic diagram of the principle structure of the reset circuit of the present invention;

FIG. 3 is a schematic diagram of the interface circuit of the present invention;

FIG. 4 is a schematic diagram of the key circuit of the present invention;

FIG. 5 is a schematic diagram of the schematic structure of the power module of the present invention;

FIG. 6 is a schematic diagram of the principle structure of the RS485 module of the present invention;

FIG. 7 is a schematic structural diagram of a display module according to the present invention;

FIG. 8 is a schematic structural diagram of a temperature detection module according to the present invention;

FIG. 9 is a schematic structural diagram of a fan driving module according to the present invention;

fig. 10 is a schematic structural diagram of a protection driving module according to the present invention.

Detailed Description

In order to facilitate an understanding of the invention, the invention is described in more detail below with reference to the accompanying drawings and specific examples. The preferred embodiments of the present invention are shown in the drawings, but the present invention may be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

The present invention will be described in detail below with reference to the accompanying drawings.

Embodiment 1, as shown in fig. 1 to 10, there is provided an LED driving circuit with a protection device, including: host system, power module, RS485 module, temperature detection module, fan drive module, display module and protection drive module, host system includes chip U1 and peripheral circuit, power module provides stable 12V and 3.3V power for entire system, RS485 module with host system's communication mouth links to each other, can external DMX controller, temperature detection module with host system's input port links to each other, detectable LED's temperature situation, fan drive module by host system control can drive the fan, display module with the delivery outlet of master control links to each other, but the temperature numerical value of display system operating mode and LED lamps and lanterns, protection drive module can drive LED illumination work to overflow and overvoltage protection function have.

Embodiment 2, as shown in fig. 1, a crystal oscillator Y1 is connected between 6 and 7 pins of the chip U1, two ends of the crystal oscillator Y1 are grounded through capacitors C3 and C9, 1, 9, 24, 36 and 48 pins of the chip U1 are connected to a 3.3V power supply, 8, 35 and 47 pins of the chip U1 are grounded, 44 pins are grounded through a resistor R3, filter capacitors C4, C5, C6 and C7 are disposed between the 3.3V power supply and the ground, and the model of the chip U1 is STM32F334C8T 6.

Embodiment 3, as shown in fig. 2 to 4, the peripheral circuit includes a reset circuit, an interface circuit and a key circuit, the reset circuit includes a reset key K1, pin 1 of the reset key K1 is grounded, a first pin 2 of the reset key K1 is grounded via a capacitor C1, a second pin is connected to a 3.3V power supply via a resistor R2, a third pin is connected to pin 8 of the chip U1, and a capacitor C2 is connected in parallel to two ends of the reset key K1; the interface circuit comprises a connector J1, pins 1 and 2 of the connector J1 are respectively connected with pins 37 and 34 of the chip U1, pin 3 of the connector J1 is grounded, pin 4 is connected with a 3.3V power supply, the key circuit comprises an adjusting interface K3 and keys K2 and K4, a first lead of pin 1 of the adjusting interface K3 is connected with the 3.3V power supply through a resistor R26, a second lead is grounded through a C39, a third lead is connected with pin 31 of the chip U1, pins 2 and 4 of the adjusting interface K3 are grounded, a first lead of pin 3 of the adjusting interface K3 is connected with the 3.3V power supply through a resistor R25, a second lead is grounded through a capacitor C38, a third lead is connected with pin 32 of the chip U1, a first lead of pin 5 of the adjusting interface K3 is grounded through a lead C37, a second lead is connected with pin 33 of the chip U1, and a pin 1 and a pin 462 of the key K1 of the adjusting interface K3 are connected with the chip U15, the capacitor C36 is connected in parallel at two ends of the key K2, a pin 1 of the key K4 is grounded, a pin 2 is connected with a pin 14 of the chip U1, and the capacitor C41 is connected in parallel at two ends of the key K4.

In this embodiment, the reset circuit is used for resetting of chip U1, and connector J1 is the debugging interface, can burn the program of chip U1 through connector J1, and button K2, K4 are the selection button, and optional display screen display information and LED mode are adjusted to interface K3 external rotary encoder, through the adjustable LED luminance of rotary encoder.

Embodiment 4, as shown in fig. 5, the power module includes a first power conversion circuit and a second power conversion circuit, the first power conversion circuit includes a chip U3, the 1 pin of the chip U3 is connected to the 10 pin of the chip U3 through a capacitor C21, the 2 pin of the chip U3 is connected to the first terminal of a resistor R16, the second pin is connected to a 24V power supply through a diode D2, capacitors C26, C29 and C30 are connected in parallel and disposed between the 2 pin of the chip U3 and ground, the second terminal of the resistor R16 is connected to ground through a resistor R22, the 4 pin of the chip U3 is connected to the second terminal of the resistor R16, the second pin is connected to ground through a capacitor C27, the 5 pin of the chip U3 is connected to ground through a resistor R20, the 9 and 11 pins are connected to ground, the 6 pin is connected to the 11 pin of the chip U1, the first pin of the chip U3 is connected to ground through a capacitor C68642, the second pin of the capacitor C5928 and the resistor R5928, the first lead of the 10 pins of the chip U3 is grounded through a diode D3, the second lead is connected with the 1 pin of an inductor L3, the first lead of the 2 pins of the inductor L3 is connected with a 12 power supply, the second lead is connected with the first end of a resistor R17, the first lead of the second end of the resistor R17 is connected with the 7 pin of the chip U3, the second lead is grounded through a resistor R21, capacitors C25, C22, C23 and C24 are connected in parallel and then arranged between the 12V power supply and the ground, the resistor R19 and the light emitting diode LED1 are connected in series and then arranged between the 12V power supply and the ground, the model of the chip U3 is 54160, the second power conversion circuit comprises a chip U4, the 1 pin of the chip U4 is grounded, the 5 pin is connected with the 12V power supply, the first lead of the 3 pin of the chip U4 is connected with the 12V power supply, the second lead is grounded through a capacitor C35, the first lead 5732 pin of the chip U32 is connected with the chip U4, the second lead is connected with the first end of an inductor L4, the first lead of the second end of the inductor L4 is connected with a 3.3V power supply, the second lead is connected with the first end of a resistor R23, the first lead of the second end of the resistor R23 is connected with a 4-pin of the chip U4, the second lead is grounded through a resistor R24, capacitors C33 and C34 are connected in parallel and then are arranged between the 3.3V power supply and the ground, and the model of the chip U4 is TPS 562200.

In this embodiment, the first power conversion circuit can convert 24V power into 12V power for the fan, and the second power conversion circuit converts 12V power into 3.3V power for the chip.

Example 5, as shown in fig. 6, the RS485 module includes a chip U5, a connector RS1, and an inductor L5, the 1 pin of the inductor L5 is connected with a 3.3V power supply, the 3 and 2 pins of the chip U5 are connected, pins 1, 2 and 4 of the chip U5 are connected to pins 43, 42 and 41 of the chip U1, the first lead of the 5 pins of the chip U5 is connected with the 3 pins of the connector RS1, the second lead is grounded, the first lead of the 6 pins of the chip U5 is connected with the 2 pins of the connector RS1 through a resistor R28, the second lead is connected with the 2 pins of the inductor L5 through a resistor R27, the first lead of the 7 pins of the chip U5 is connected with the 1 pin of the connector RS1 through a resistor R29, the second lead is grounded through a resistor R30, the first lead of the 8 pins of the chip U5 is connected with the 2 pins of the inductor L5, the second lead is grounded through a capacitor C40, and the model of the chip U5 is RS 485.

In this embodiment, connector RS1 is used to interface with a DMX controller, which is a desktop electronic system for controlling lighting that allows an operator to customize lighting effects. Through the DMX controller, many different brands of lighting equipment can be networked, so that all lighting is placed under one master control, and large-scale deployment and centralized control of a lighting system are facilitated.

Embodiment 6, as shown in fig. 8, the temperature detecting module includes a connector J4 and a thermistor R36, a first lead of a 1 pin of the connector J4 is connected to a 3.3V power supply through a resistor R31, a second lead is connected to ground through a capacitor C47, a third lead is connected to a 13 pin of the chip U1 through a resistor R32, a 2 pin of the connector J4 is connected to ground, a first lead of a first end of the thermistor R36 is connected to a 3.3V power supply through a resistor R34, a second lead is connected to ground through a capacitor C49, a third lead is connected to a 12 pin of the chip U1 through a resistor R35, and a second end of the thermistor R36 is connected to ground.

In this embodiment, the connector J4 may be externally connected with a temperature sensor, the temperature sensor may detect temperature information of the LED lamp and send the temperature information to the main control module, and the thermistor R36 may be used to detect temperature information of the circuit board of the protection driving module.

Embodiment 7, as shown in fig. 9, the fan driving module includes MOS transistors Q3 and Q4, a first pin of 1 pin of the MOS transistor Q3 is grounded via a resistor R33, a second pin is connected to the 26 pin of the chip U1, a pin 2 of the MOS transistor Q3 is grounded, a pin 3 is connected to the pin 1 of the connector J3, a pin 2 of the connector J3 is connected to a 12V power supply, a capacitor C46 is disposed between the pins 1 and 2 of the connector J3, a first pin of 1 pin of the MOS transistor Q4 is grounded via a resistor R37, a second pin is connected to the pin 27 of the chip U1, a pin 2 of the MOS transistor Q4 is grounded, a pin 3 is connected to the pin 1 of the connector J5, a pin 2 of the connector J5 is connected to a 12V power supply, and a capacitor C48 is disposed between the pins 1 and 2 of the connector J5.

In this embodiment, the connectors J3 and J5 are external heat dissipation fan interfaces, and the main control module adjusts the heat dissipation intensity of the fan through the PWM control signal, so as to achieve the effect of protecting the lamp and the circuit board of the driving module.

Embodiment 8, as shown in fig. 7, the display module includes a display interface LCD1, pins 1 and 7 of the display interface LCD1 are connected to a 3.3V power supply, capacitors C43 and C45 are respectively disposed between the 3.3V power supply and ground, pins 2 and 6 of the display interface LCD1 are connected to ground, pin 3 is connected to ground through a capacitor C42, and pins 8, 9, 10, 11 and 12 of the display interface LCD1 are connected to pins 46, 45, 22, 21 and 20 of the chip U1, respectively.

In the display module, a display screen can display the working mode of the system and the temperature value of the lamp, so that a worker can know the condition of the lamp in real time.

Embodiment 9, as shown in fig. 10, the protection driving module includes a chip U2, a first lead of an 8-pin of the chip U2 is connected to a 25-pin of the chip U1 through a resistor R1, a second lead is connected to ground through a resistor R13, pins 6 and 7 of the chip U2 are connected to ground, a 5-pin is connected to ground through a resistor R10 and a capacitor C19, a 11-pin is connected to ground through a resistor R9, a 10-pin is connected to ground through a capacitor C18, a first lead of a 12-pin of the chip U2 is connected to ground through a resistor R6, a second lead is connected to a first end of a fuse F1 through a resistor R4, a second end of the fuse F1 is connected to a 24V power supply, a first lead of a 14-pin of the chip U2 is connected to a first end of the fuse F1, a second lead is connected to a first end of an inductor L2, capacitors C10, C11, C12 and C13 are connected in parallel and then arranged between a first end of the inductor L1, a second lead is connected with a drain of a MOS transistor Q1, a second terminal of the diode D1 is connected with a first terminal of a resistor R5, capacitors C14, C15, C16 and C17 are connected in parallel and then are arranged between a second terminal of the diode D1 and the ground, a gate of the MOS transistor Q1 is connected with a 16-pin of the chip U2, a first lead of a source of the MOS transistor Q1 is connected with a 15-pin of the chip U2, a second lead is connected with the ground through a resistor R8, a first lead of a 2-pin of the chip U2 is connected with a second terminal of the diode D1 through a resistor R7, a second lead is connected with the ground through a resistor R1, a 4-pin of the chip U1 is connected with a first terminal of the resistor R1, a first lead of a 3-pin of the chip U1 is connected with a second terminal of the resistor R1, a second lead is connected with a 1-pin of the J1, a 1-pin of the chip U1 is connected with a gate of the MOS transistor Q1 through a resistor R1, a gate of the MOS transistor Q1, and a gate of the transistor Q1, the drain electrode of the MOS tube Q2 is connected with the 2 pin of the connector J2, the 9 pin of the chip U2 is connected with the 13 pin of the chip U2 through a resistor R11, the 13 pin of the chip U2 is grounded through a capacitor C20, and the model of the chip U2 is LT 3756.

In this embodiment, a chip U2 receives a PWM signal from a main control module to control the operation and dimming of an LED, a fuse F1 prevents an overvoltage/overcurrent burnout circuit, a chip U2 is an LT3756, the chip LT3756 is a light emitting diode driver and can achieve constant current regulation of the LED, the PWM input provides an LED dimming ratio of up to 3000:1, the chip LT3756 drives a low-side external N-channel power MOSFET from an internal regulated 7.15V power supply to ensure the stability of an output voltage, and the LT3756 detects an output current at the high end of the LED, and when the output current is higher than a set value, the inside of the chip is automatically turned off to cut off a loop and protect a rear-stage circuit.

The working principle of the invention is as follows:

the LED lamp protection system comprises a main control module, a protection driving module, a power supply module, a temperature detection module, a power supply module and a display screen, wherein the power supply module is used for power supply conversion for a subsequent circuit, the main control module outputs PWM signals, the protection driving module controls the LED to light up, when the LED is in overcurrent, the protection driving module can cut off the output, the temperature detection module detects the temperature of the lamp and the protection driving module in real time and feeds the temperature back to the main control module, the main control module controls the on-off and the heat dissipation intensity of a heat dissipation fan according to the collected temperature information, protection is provided for an LED device and the protection driving module, and the display screen can display the temperature information and the system working mode in real time.

The technical features mentioned above are combined with each other to form various embodiments which are not listed above, and all of them are regarded as the scope of the present invention described in the specification; also, modifications and variations may be suggested to those skilled in the art in light of the above teachings, and it is intended to cover all such modifications and variations as fall within the true spirit and scope of the invention as defined by the appended claims.