Protection circuit of LED drive circuit and LED drive circuit

By designing an LED driver circuit that integrates multiple modules, the problem of insufficient protection function of traditional LED driver circuits is solved, and higher safety, reliability and energy efficiency are achieved, which is suitable for the needs of intelligent lighting systems.

CN222814627UActive Publication Date: 2025-04-29SUZHOU EUCHIPS IND CO LTD
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Patent Information

Application Number
CN202421765818.8
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-07-24
Publication Date
2025-04-29
Estimated Expiration
2034-07-24

AI Technical Summary

Technical Problem

When traditional LED driver circuits face power fluctuations, environmental overheating or circuit failure, the protection function is insufficient, resulting in damage to LED equipment or shortened life, and their application in intelligent lighting systems is limited.

Method used

An LED driving circuit including a filtering module, a rectifier module, a PFC power factor correction module, a DC/DC conversion module, a current detection and regulation module, a DALI control module and a protection module are designed, and fault detection and protection are realized through optocouplers and complex feedback mechanisms.

Benefits of technology

Improves the safety and reliability of LED driver circuits, improves flexibility and energy efficiency, is suitable for the needs of modern lighting systems, and provides more possibilities in intelligent control and remote management.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of circuits, and discloses a protection circuit of an LED drive circuit and the LED drive circuit, and the LED drive circuit comprises a filtering module, a rectification module, a PFC power factor correction module, a DC / DC conversion module, a current detection and adjustment module, a DALI control module, a dial-up current selection module and a protection module. The filter module, the rectifier module, the PFC power factor correction module, the DC / DC conversion module, the current detection and adjustment module and the DALI control module are connected in sequence, and the DALI control module is further connected with the dial-up current selection module and the protection module. According to the utility model, not only are the safety and reliability of the LED driving circuit improved, but also the flexibility and energy efficiency of the LED driving circuit are improved, so that the LED driving circuit is more suitable for the requirements of a modern lighting system, meanwhile, more possibilities can be provided for the LED lighting equipment in the aspects of intelligent control and remote management, and the development of an intelligent lighting technology can be promoted.
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Description

Technical Field

[0001] The utility model relates to the technical field of circuits, and in particular to a protection circuit of an LED drive circuit and an LED drive circuit. Background Art

[0002] LED (light emitting diode) driver circuits are of irreplaceable importance in the field of contemporary lighting technology. LEDs have been widely used in residential, commercial, industrial and road lighting due to their significant advantages such as high energy efficiency, long life, compact size and fast response. These advantages have led to LED lighting gradually replacing traditional lighting equipment such as incandescent and fluorescent lamps in the market. However, to fully utilize the performance of LEDs and extend their service life, current and voltage must be precisely controlled. Problems such as unstable power supply, voltage fluctuations or overloads can lead to early failure of LED equipment.

[0003] Traditional LED driver circuit designs usually only include basic protection functions, which are inadequate in modern lighting applications. When faced with power fluctuations, environmental overheating, or circuit failures, these basic protection measures often fail to effectively protect LED lamps, resulting in equipment damage or shortened life. In addition, with the rapid development of smart homes and modern building management systems, traditional LED driver technology has obvious limitations in terms of flexibility in brightness control and compatibility with smart lighting systems. These limitations not only reduce the application potential of LED technology in smart control environments, but also affect the optimization of user experience and energy efficiency management.

[0004] Currently, no effective solution has been proposed for the problems in the related technologies. Utility Model Content

[0005] In view of the problems in the related art, the utility model proposes a protection circuit of an LED driving circuit and an LED driving circuit to overcome the above technical problems existing in the existing related art.

[0006] To this end, the specific technical solutions adopted by the utility model are as follows:

[0007] According to one aspect of the present invention, a protection circuit for an LED driving circuit is provided, including a chip U102, an optocoupler PC101-B, a diode D106, a diode D107, a capacitor CE102, a capacitor C109, a capacitor C110, a capacitor C111, a capacitor C112, a capacitor C113, a capacitor C114, a resistor R104, a resistor R105, a resistor R106, a resistor R112, a resistor R113, a resistor R113A, a resistor R114, a resistor R115, a resistor R118, a resistor R120, a resistor R121, a resistor R123, a resistor R133, a resistor R134, a resistor R135, a resistor R136, and a resistor R137. 37 and resistor R143; wherein the first pin of the chip U102 is connected to one end of the resistor R113A, and the other end of the resistor R113A is connected to one end of the resistor R11; the third pin of the chip U102 is respectively connected to one end of the resistor R143 and one end of the capacitor C109, the other end of the resistor R143 is respectively connected to one end of the resistor R115, one end of the resistor R114 and one end of the resistor R112, the other end of the resistor R112 is connected to one end of the resistor R106, the other end of the resistor R106 is connected to one end of the resistor R105, and the other end of the resistor R105 is connected to the resistor R106. The fourth pin of the chip U102 is connected to one end of the resistor R118 and the capacitor C110 respectively; the fifth pin of the chip U102 is connected to the capacitor C111 and one end of the photoelectric coupler PC101-B respectively; the seventh pin of the chip U102 is connected to the capacitor C112 and one end of the photoelectric coupler PC101-B respectively; the eighth pin of the chip U102 is connected to the capacitor C113 and one end of the photoelectric coupler PC101-B respectively; the eighth pin of the chip U102 is connected to the capacitor C114 and one end of the photoelectric coupler PC101-B respectively; the eighth pin of the chip U102 is connected to the capacitor C115 and one end of the photoelectric coupler PC101-B respectively; the eighth pin of the chip U102 is connected to the capacitor C116 and one end of the photoelectric coupler PC101-B respectively; the eighth pin of the chip U102 is connected to the capacitor C117 and one end of the photoelectric coupler PC101-B respectively; the eighth pin of the chip U102 is connected to the capacitor C118 and one end of the photoelectric coupler PC101-B respectively; the eighth pin of the chip U102 is connected to the capacitor C118 and one end of the photoelectric coupler PC101-B respectively; the eighth pin of the chip U102 is connected to the capacitor C117 ... The eighth pin of the chip U102 is respectively connected to one end of the capacitor C112 and one end of the resistor R121, and the other end of the capacitor C112 is respectively connected to one end of the capacitor CE102, the other end of the resistor R121, the other end of the resistor R120, the other end of the capacitor C111, the other end of the photoelectric coupler PC101-B, the other end of the resistor R118, the other end of the capacitor C110, the other end of the capacitor C109, the other end of the resistor R115, the other end of the resistor R114, the other end of the resistor R137 and the other end of the resistor R136 and grounded;The tenth pin of the chip U102 is connected to one end of the capacitor C113, the cathode of the diode D106 and the anode of the diode D107 respectively, the other end of the capacitor C113 is connected to the eleventh pin of the chip U102 and grounded, the anode of the diode D106 is connected to the other end of the capacitor CE102, and the cathode of the diode D107 is connected to one end of the resistor R123; the fifteenth pin of the chip U102 is connected to one end of the capacitor C114, and the other end of the capacitor C114 is connected to the sixteenth pin of the chip U102 and the other end of the resistor R123 respectively.;

[0008] Furthermore, the capacitor CE102 is a polarized capacitor.

[0009] According to another aspect of the present invention, there is provided an LED driving circuit, comprising a filtering module, a rectifying module, a PFC power factor correction module, a DC / DC conversion module, a current detection and regulation module, a DALI control module, a dial code current selection module and a protection module, and the protection module is a protection circuit of the above-mentioned LED driving circuit; wherein the filtering module, the rectifying module, the PFC power factor correction module, the DC / DC conversion module, the current detection and regulation module and the DALI control module are connected in sequence, and the DALI control module is also respectively connected to the dial code current selection module and the protection module.

[0010] Further, the PFC power factor correction module includes a full-bridge rectifier D, a chip U301, an inductor L1, a MOS tube Q1, a diode D301, a diode D302, a diode D303, a capacitor C301, a capacitor C302, a capacitor C303, a capacitor C304, a capacitor C305, a capacitor C306, a resistor R303, a resistor R304, a resistor R305, a resistor R306, a resistor R307, a resistor R308, a resistor R309, a resistor R310, a resistor R311 and a resistor R312; wherein the first pin of the chip U301 is connected to one end of the resistor R307, and the other end of the resistor R307 is connected to the resistor R306 respectively. and the second input end of the inductor L1, the second output end of the inductor L1 is grounded, the other end of the resistor R306 is connected to one end of the capacitor C302, the other end of the capacitor C302 is respectively connected to the positive electrode of the diode D301 and the negative electrode of the diode D302, the positive electrode of the diode D302 is grounded, the negative electrode of the diode D301 is respectively connected to one end of the resistor R305, one end of the capacitor C303 and the eighth pin of the chip U301, the other end of the resistor R305 is respectively connected to one end of the resistor R303, one end of the capacitor C301, the first input end of the inductor L1 and one end of the full-bridge rectifier D The other end of the full-bridge rectifier D is respectively connected to the other end of the capacitor C301, one end of the resistor R304, the other end of the capacitor C303, the sixth pin of the chip U301, one end of the resistor R310, one end of the resistor R312 and one end of the capacitor C306 and grounded, the other end of the resistor R304 is respectively connected to the other end of the resistor R303 and the seventh pin of the chip U301; the second pin of the chip U301 is respectively connected to one end of the capacitor C304 and one end of the capacitor C305, the other end of the capacitor C304 is connected to one end of the resistor R308, and the other end of the resistor R308 is respectively connected to the ground. It is connected to the other end of the capacitor C305, the third pin of the chip U301, one end of the resistor R311 and the other end of the resistor R312. The other end of the resistor R311 is respectively connected to the other end of the capacitor C306 and the cathode of the diode D303. The anode of the diode D303 is respectively connected to the first output end of the inductor L1 and the drain of the MOS tube Q1. The source of the MOS tube Q1 is respectively connected to the other end of the resistor R310 and the fifth pin of the chip U301. The gate of the MOS tube Q1 is connected to one end of the resistor R309. The other end of the resistor R309 is connected to the fourth pin of the chip U301.

[0011] Furthermore, the diode D302 is a voltage-stabilizing diode, and the capacitor C306 is a polarized capacitor.

[0012] Further, the current detection and regulation module includes an operational amplifier U202-A, an operational amplifier U202-B, an operational amplifier U203-A, an operational amplifier U203-B, an interface CN301, an optocoupler PC101-A, a diode D201, a diode D202, a diode D204, a diode D205, a capacitor C207, a capacitor C208, a capacitor C209, a capacitor C213, a capacitor C215, a resistor R207, a resistor R209, a resistor R210, a resistor R211, a resistor R212, a resistor R213, and a resistor R214. 4. resistor R215, resistor R216, resistor R217, resistor R218, resistor R219, resistor R220, resistor R221, resistor R227, resistor R228, resistor RT301; wherein the first pin of the operational amplifier U202-A is respectively connected to one end of the resistor R210, one end of the resistor R215 and one end of the capacitor C205, the other end of the resistor R210 is connected to the cathode of the diode D201, the anode of the diode D201 is respectively connected to one end of the resistor R209, the cathode of the diode D202 The positive electrode is connected to one end of the photoelectric coupler PC101-A, the other end of the photoelectric coupler PC101-A is respectively connected to the other end of the resistor R209 and one end of the resistor R207, the other end of the resistor R207 is connected to one end of the resistor R216; the second pin of the operational amplifier U202-A is respectively connected to one end of the capacitor C204, the other end of the capacitor C205, one end of the resistor R212, one end of the resistor R213 and one end of the resistor R214, the other end of the capacitor C204 is connected to the resistor R21 5; the third pin of the operational amplifier U202-A is connected to one end of the capacitor C215, the other end of the capacitor C215 is respectively connected to the fourth pin of the operational amplifier U202-A, the other end of the resistor R213, the other end of the resistor R214, one end of the capacitor C207 and one end of the resistor R228, the other end of the resistor R228 is connected to the fifth pin of the operational amplifier U203-B, and the sixth pin of the operational amplifier U203-B is connected to the seventh pin of the operational amplifier U203-B;The first pin of the operational amplifier U203-A is respectively connected to one end of the resistor R211 and one end of the resistor R219, the second pin of the operational amplifier U203-A is respectively connected to the other end of the resistor R219 and one end of the resistor R220, the other end of the resistor R220 is respectively connected to the fourth pin of the operational amplifier U203-A, one end of the capacitor C213, one end of the resistor RT301 and the fifth pin of the interface CN301, the third pin of the operational amplifier U203-A is connected to one end of the resistor R221; the fifth pin of the operational amplifier U202-B is connected to the first pin of the operational amplifier U203-A, the second pin of the operational amplifier U203-A is connected to the second end of the resistor R219 and the second end of the resistor R220. The sixth pin of the operational amplifier U203-B is respectively connected to the other end of the resistor R211, one end of the capacitor C208 and one end of the capacitor C209, the other end of the capacitor C209 is connected to one end of the resistor R218, the other end of the resistor R218 is respectively connected to the other end of the capacitor C208, one end of the resistor R217 and the seventh pin of the operational amplifier U203-B, and the other end of the resistor R217 is connected to the cathode of the diode D202.

[0013] The beneficial effects of the utility model are:

[0014] 1) The utility model not only improves the safety and reliability of the LED driving circuit, but also enhances its flexibility and energy efficiency, making it more suitable for the needs of modern lighting systems. At the same time, it can provide more possibilities for the intelligent control and remote management of LED lighting equipment, and help promote the development of intelligent lighting technology.

[0015] 2) The utility model can use accurate current detection and instant feedback adjustment. When overvoltage or overcurrent occurs in the circuit, the protection module can respond quickly to protect the LED from damage.

[0016] 3) The utility model enables the system to detect specific fault points through photoelectric couplers and complex feedback mechanisms, and informs the user through the control system, thereby improving maintenance efficiency and system reliability.

[0017] 4) The utility model allows users to adjust the brightness through a standard digital interface through an integrated DALI control module, and can accurately control from full brightness to extremely low brightness to meet the lighting needs of different scenes.

[0018] 5) The PFC power factor correction module and the efficient DC / DC conversion module of the utility model ensure that the energy efficiency of the circuit is maximized, and energy consumption and heat generation are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 is a circuit diagram of a protection circuit of an LED drive circuit according to an embodiment of the utility model;

[0021] Figure 2 is a circuit diagram of an LED driving circuit according to an embodiment of the utility model;

[0022] Figure 3 It is a circuit diagram of a PFC power factor correction module in an LED drive circuit according to an embodiment of the utility model;

[0023] Figure 4 It is a circuit diagram of a current detection and regulation module in an LED driving circuit according to an embodiment of the utility model.

[0024] In the figure:

[0025] 1. Filter module; 2. Rectification module; 3. PFC power factor correction module; 4. DC / DC conversion module; 5. Current detection and regulation module; 6. DALI control module; 7. DIP switch current selection module; 8. Protection module. DETAILED DESCRIPTION

[0026] To further illustrate each embodiment, the present invention provides drawings, which are part of the disclosure of the present invention and are mainly used to illustrate the embodiments. They can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, ordinary technicians in the field should be able to understand other possible implementation methods and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0027] According to an embodiment of the utility model, a protection circuit of an LED driving circuit and an LED driving circuit are provided.

[0028] The present invention is now further described in conjunction with the accompanying drawings and specific implementation methods. Figure 1As shown, according to an embodiment of the utility model, a protection circuit for an LED driving circuit is provided, including a chip U102, a photocoupler PC101-B, a diode D106, a diode D107, a capacitor CE102 (capacitor CE102 is a polarized capacitor), a capacitor C109, a capacitor C110, a capacitor C111, a capacitor C112, a capacitor C113, a capacitor C114, a resistor R104, a resistor R105, a resistor R106, a resistor R112, a resistor R113, a resistor R113A, a resistor R114, a resistor R115, a resistor R118, a resistor R120, a resistor R121, a resistor R123, a resistor R133, a resistor R134, a resistor R135, a resistor R136, a resistor R137 and a resistor R143;

[0029] The first pin of the chip U102 is connected to one end of the resistor R113A, and the other end of the resistor R113A is connected to one end of the resistor R11;

[0030] The third pin of the chip U102 is respectively connected to one end of the resistor R143 and one end of the capacitor C109, the other end of the resistor R143 is respectively connected to one end of the resistor R115, one end of the resistor R114 and one end of the resistor R112, the other end of the resistor R112 is connected to one end of the resistor R106, the other end of the resistor R106 is connected to one end of the resistor R105, the other end of the resistor R105 is connected to one end of the resistor R104, the other end of the resistor R104 is connected to one end of the resistor R133, the other end of the resistor R133 is connected to one end of the resistor R134, the other end of the resistor R134 is connected to one end of the resistor R135, and the other end of the resistor R135 is respectively connected to one end of the resistor R136 and one end of the resistor R137;

[0031] The fourth pin of the chip U102 is connected to one end of the resistor R118 and the capacitor C110 respectively; the fifth pin of the chip U102 is connected to the capacitor C111 and one end of the photocoupler PC101-B respectively;

[0032] The seventh pin of the chip U102 is connected to one end of the resistor R120, the eighth pin of the chip U102 is respectively connected to one end of the capacitor C112 and one end of the resistor R121, the other end of the capacitor C112 is respectively connected to one end of the capacitor CE102, the other end of the resistor R121, the other end of the resistor R120, the other end of the capacitor C111, the other end of the photocoupler PC101-B, the other end of the resistor R118, the other end of the capacitor C110, the other end of the capacitor C109, the other end of the resistor R115, the other end of the resistor R114, the other end of the resistor R137 and the other end of the resistor R136 and are grounded;

[0033] The tenth pin of the chip U102 is respectively connected to one end of the capacitor C113, the cathode of the diode D106 and the anode of the diode D107, the other end of the capacitor C113 is connected to the eleventh pin of the chip U102 and grounded, the anode of the diode D106 is connected to the other end of the capacitor CE102, and the cathode of the diode D107 is connected to one end of the resistor R123;

[0034] The fifteenth pin of the chip U102 is connected to one end of the capacitor C114, and the other end of the capacitor C114 is connected to the sixteenth pin of the chip U102 and the other end of the resistor R123 respectively.

[0035] According to another embodiment of the present invention, Figure 2-Figure 4 As shown, an LED driving circuit is provided, including a filtering module 1, a rectifying module 2, a PFC power factor correction module 3, a DC / DC conversion module 4, a current detection and adjustment module 5, a DALI control module 6, a dial code current selection module 7 and a protection module 8, and the protection module 8 is a protection circuit of the above-mentioned LED driving circuit;

[0036] Among them, the filtering module 1, the rectifying module 2, the PFC power factor correction module 3, the DC / DC conversion module 4, the current detection and regulation module 5 and the DALI control module 6 are connected in sequence, and the DALI control module 6 is also connected to the dial code current selection module 7 and the protection module 8 respectively.

[0037] Specifically, the PFC power factor correction module 3 includes a full-bridge rectifier D, a chip U301, an inductor L1, a MOS tube Q1, a diode D301, a diode D302 (diode D302 is a voltage-stabilizing diode), a diode D303, a capacitor C301, a capacitor C302, a capacitor C303, a capacitor C304, a capacitor C305, a capacitor C306 (capacitor C306 is a polarized capacitor), a resistor R303, a resistor R304, a resistor R305, a resistor R306, a resistor R307, a resistor R308, a resistor R309, a resistor R310, a resistor R311 and a resistor R312;

[0038] The first pin of the chip U301 is connected to one end of the resistor R307, the other end of the resistor R307 is respectively connected to one end of the resistor R306 and the second input end of the inductor L1, the second output end of the inductor L1 is grounded, the other end of the resistor R306 is connected to one end of the capacitor C302, the other end of the capacitor C302 is respectively connected to the positive electrode of the diode D301 and the negative electrode of the diode D302, the positive electrode of the diode D302 is grounded, the negative electrode of the diode D301 is respectively connected to one end of the resistor R305, one end of the capacitor C303 and the eighth terminal of the chip U301. The other end of the resistor R305 is respectively connected to one end of the resistor R303, one end of the capacitor C301, the first input end of the inductor L1 and one end of the full-bridge rectifier D; the other end of the full-bridge rectifier D is respectively connected to the other end of the capacitor C301, one end of the resistor R304, the other end of the capacitor C303, the sixth pin of the chip U301, one end of the resistor R310, one end of the resistor R312 and one end of the capacitor C306 and grounded; the other end of the resistor R304 is respectively connected to the other end of the resistor R303 and the seventh pin of the chip U301;

[0039] The second pin of the chip U301 is respectively connected to one end of the capacitor C304 and one end of the capacitor C305, the other end of the capacitor C304 is connected to one end of the resistor R308, the other end of the resistor R308 is respectively connected to the other end of the capacitor C305, the third pin of the chip U301, one end of the resistor R311 and the other end of the resistor R312, the other end of the resistor R311 is respectively connected to the other end of the capacitor C306 and the negative electrode of the diode D303, the positive electrode of the diode D303 is respectively connected to the first output end of the inductor L1 and the drain of the MOS tube Q1, the source of the MOS tube Q1 is respectively connected to the other end of the resistor R310 and the fifth pin of the chip U301, the gate of the MOS tube Q1 is connected to one end of the resistor R309, and the other end of the resistor R309 is connected to the fourth pin of the chip U301.

[0040] Specifically, the current detection and regulation module 5 includes an operational amplifier U202-A, an operational amplifier U202-B, an operational amplifier U203-A, an operational amplifier U203-B, an interface CN301, an optocoupler PC101-A, a diode D201, a diode D202, a diode D204, a diode D205, a capacitor C207, a capacitor C208, a capacitor C209, a capacitor C213, a capacitor C215, a resistor R207, a resistor R209, a resistor R210, a resistor R211, a resistor R212, a resistor R213, a resistor R214, a resistor R215, a resistor R216, a resistor R217, a resistor R218, a resistor R219, a resistor R220, a resistor R221, a resistor R227, a resistor R228, and a resistor RT301;

[0041] Wherein, the first pin of the operational amplifier U202-A is respectively connected to one end of the resistor R210, one end of the resistor R215 and one end of the capacitor C205, the other end of the resistor R210 is connected to the cathode of the diode D201, the anode of the diode D201 is respectively connected to one end of the resistor R209, the anode of the diode D202 and one end of the photoelectric coupler PC101-A, the other end of the photoelectric coupler PC101-A is respectively connected to the other end of the resistor R209 and one end of the resistor R207, and the other end of the resistor R207 is connected to one end of the resistor R216;

[0042] The second pin of the operational amplifier U202-A is respectively connected to one end of the capacitor C204, the other end of the capacitor C205, one end of the resistor R212, one end of the resistor R213 and one end of the resistor R214, and the other end of the capacitor C204 is connected to the other end of the resistor R215;

[0043] The third pin of the operational amplifier U202-A is connected to one end of the capacitor C215, the other end of the capacitor C215 is respectively connected to the fourth pin of the operational amplifier U202-A, the other end of the resistor R213, the other end of the resistor R214, one end of the capacitor C207 and one end of the resistor R228, the other end of the resistor R228 is connected to the fifth pin of the operational amplifier U203-B, and the sixth pin of the operational amplifier U203-B is connected to the seventh pin of the operational amplifier U203-B;

[0044] The first pin of the operational amplifier U203-A is respectively connected to one end of the resistor R211 and one end of the resistor R219, the second pin of the operational amplifier U203-A is respectively connected to the other end of the resistor R219 and one end of the resistor R220, the other end of the resistor R220 is respectively connected to the fourth pin of the operational amplifier U203-A, one end of the capacitor C213, one end of the resistor RT301 and the fifth pin of the interface CN301, and the third pin of the operational amplifier U203-A is connected to one end of the resistor R221;

[0045] The fifth pin of the operational amplifier U202-B is respectively connected to the other end of the capacitor C213, the other end of the resistor RT301 and the third pin of the interface CN301, the sixth pin of the operational amplifier U203-B is respectively connected to the other end of the resistor R211, one end of the capacitor C208 and one end of the capacitor C209, the other end of the capacitor C209 is connected to one end of the resistor R218, the other end of the resistor R218 is respectively connected to the other end of the capacitor C208, one end of the resistor R217 and the seventh pin of the operational amplifier U203-B, the other end of the resistor R217 is connected to the negative electrode of the diode D202

[0046] In summary, with the help of the above technical solutions of the utility model, the utility model not only improves the safety and reliability of the LED drive circuit, but also improves its flexibility and energy efficiency, making it more suitable for the needs of modern lighting systems. At the same time, it can provide more possibilities for LED lighting equipment in intelligent control and remote management, which is helpful to promote the development of intelligent lighting technology. In addition, the utility model can be adjusted through precise current detection and instant feedback. When the circuit is overvoltage or overcurrent, the protection module can respond quickly to protect the LED from damage. In addition, the utility model enables the system to detect specific fault points through photoelectric couplers and complex feedback mechanisms, and notify the user through the control system, thereby improving maintenance efficiency and system reliability. In addition, the utility model allows users to adjust the brightness through a standard digital interface through an integrated DALI control module, which can be accurately controlled from full brightness to extremely low brightness to meet the lighting needs of different scenes. In addition, the PFC power factor correction module and the efficient DC / DC conversion module of the utility model ensure that the energy efficiency of the circuit is maximized, reducing energy consumption and heat generation.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A protection circuit for an LED driving circuit, characterized in that: Including chip U102, photocoupler PC101-B, diode D106, diode D107, capacitor CE102, capacitor C109, capacitor C110, capacitor C111, capacitor C112, capacitor C113, capacitor C114, resistor R104, resistor R105, resistor R106, resistor R112, resistor R113, resistor R113A, resistor R114, resistor R115, resistor R118, resistor R120, resistor R121, resistor R123, resistor R133, resistor R134, resistor R135, resistor R136, resistor R137 and resistor R143; The first pin of the chip U102 is connected to one end of the resistor R113A, and the other end of the resistor R113A is connected to one end of the resistor R11; The third pin of the chip U102 is respectively connected to one end of the resistor R143 and one end of the capacitor C109, the other end of the resistor R143 is respectively connected to one end of the resistor R115, one end of the resistor R114 and one end of the resistor R112, the other end of the resistor R112 is connected to one end of the resistor R106, the other end of the resistor R106 is connected to one end of the resistor R105, the other end of the resistor R105 is connected to one end of the resistor R104, the other end of the resistor R104 is connected to one end of the resistor R133, the other end of the resistor R133 is connected to one end of the resistor R134, the other end of the resistor R134 is connected to one end of the resistor R135, and the other end of the resistor R135 is respectively connected to one end of the resistor R136 and one end of the resistor R137; The fourth pin of the chip U102 is connected to one end of the resistor R118 and the capacitor C110 respectively; the fifth pin of the chip U102 is connected to the capacitor C111 and one end of the photocoupler PC101-B respectively; The seventh pin of the chip U102 is connected to one end of the resistor R120, the eighth pin of the chip U102 is respectively connected to one end of the capacitor C112 and one end of the resistor R121, the other end of the capacitor C112 is respectively connected to one end of the capacitor CE102, the other end of the resistor R121, the other end of the resistor R120, the other end of the capacitor C111, the other end of the photocoupler PC101-B, the other end of the resistor R118, the other end of the capacitor C110, the other end of the capacitor C109, the other end of the resistor R115, the other end of the resistor R114, the other end of the resistor R137 and the other end of the resistor R136 and are grounded; The tenth pin of the chip U102 is respectively connected to one end of the capacitor C113, the cathode of the diode D106 and the anode of the diode D107, the other end of the capacitor C113 is connected to the eleventh pin of the chip U102 and grounded, the anode of the diode D106 is connected to the other end of the capacitor CE102, and the cathode of the diode D107 is connected to one end of the resistor R123; The fifteenth pin of the chip U102 is connected to one end of the capacitor C114, and the other end of the capacitor C114 is connected to the sixteenth pin of the chip U102 and the other end of the resistor R123 respectively.

2. The protection circuit of the LED driving circuit according to claim 1, characterized in that: The capacitor CE102 is a polarized capacitor.

3. An LED driving circuit, characterized in that: The invention comprises a filtering module (1), a rectifying module (2), a PFC power factor correction module (3), a DC / DC conversion module (4), a current detection and regulation module (5), a DALI control module (6), a dial current selection module (7) and a protection module (8), wherein the protection module (8) is a protection circuit of the LED driving circuit according to any one of claims 1 to 2; The filter module (1), the rectifier module (2), the PFC power factor correction module (3), the DC / DC conversion module (4), the current detection and regulation module (5) and the DALI control module (6) are connected in sequence, and the DALI control module (6) is also respectively connected to the dial current selection module (7) and the protection module (8).

4. The LED driving circuit according to claim 3, characterized in that: The PFC power factor correction module (3) comprises a full-bridge rectifier D, a chip U301, an inductor L1, a MOS tube Q1, a diode D301, a diode D302, a diode D303, a capacitor C301, a capacitor C302, a capacitor C303, a capacitor C304, a capacitor C305, a capacitor C306, a resistor R303, a resistor R304, a resistor R305, a resistor R306, a resistor R307, a resistor R308, a resistor R309, a resistor R310, a resistor R311 and a resistor R312; The first pin of the chip U301 is connected to one end of the resistor R307, the other end of the resistor R307 is respectively connected to one end of the resistor R306 and the second input end of the inductor L1, the second output end of the inductor L1 is grounded, the other end of the resistor R306 is connected to one end of the capacitor C302, the other end of the capacitor C302 is respectively connected to the positive electrode of the diode D301 and the negative electrode of the diode D302, the positive electrode of the diode D302 is grounded, the negative electrode of the diode D301 is respectively connected to one end of the resistor R305, one end of the capacitor C303 and the eighth terminal of the chip U301. The other end of the resistor R305 is respectively connected to one end of the resistor R303, one end of the capacitor C301, the first input end of the inductor L1 and one end of the full-bridge rectifier D; the other end of the full-bridge rectifier D is respectively connected to the other end of the capacitor C301, one end of the resistor R304, the other end of the capacitor C303, the sixth pin of the chip U301, one end of the resistor R310, one end of the resistor R312 and one end of the capacitor C306 and grounded; the other end of the resistor R304 is respectively connected to the other end of the resistor R303 and the seventh pin of the chip U301; The second pin of the chip U301 is respectively connected to one end of the capacitor C304 and one end of the capacitor C305, the other end of the capacitor C304 is connected to one end of the resistor R308, the other end of the resistor R308 is respectively connected to the other end of the capacitor C305, the third pin of the chip U301, one end of the resistor R311 and the other end of the resistor R312, the other end of the resistor R311 is respectively connected to the other end of the capacitor C306 and the negative electrode of the diode D303, the positive electrode of the diode D303 is respectively connected to the first output end of the inductor L1 and the drain of the MOS tube Q1, the source of the MOS tube Q1 is respectively connected to the other end of the resistor R310 and the fifth pin of the chip U301, the gate of the MOS tube Q1 is connected to one end of the resistor R309, and the other end of the resistor R309 is connected to the fourth pin of the chip U301.

5. The LED driving circuit according to claim 4, characterized in that: The diode D302 is a voltage stabilizing diode, and the capacitor C306 is a polarized capacitor.

6. The LED driving circuit according to claim 3, characterized in that: The current detection and regulation module (5) comprises an operational amplifier U202-A, an operational amplifier U202-B, an operational amplifier U203-A, an operational amplifier U203-B, an interface CN301, a photoelectric coupler PC101-A, a diode D201, a diode D202, a diode D204, a diode D205, a capacitor C207, a capacitor C208, a capacitor C209, a capacitor C213, a capacitor C215, a resistor R207, a resistor R209, a resistor R210, a resistor R211, a resistor R212, a resistor R213, a resistor R214, a resistor R215, a resistor R216, a resistor R217, a resistor R218, a resistor R219, a resistor R220, a resistor R221, a resistor R227, a resistor R228, and a resistor RT301; The first pin of the operational amplifier U202-A is respectively connected to one end of the resistor R210, one end of the resistor R215 and one end of the capacitor C205, the other end of the resistor R210 is connected to the cathode of the diode D201, the anode of the diode D201 is respectively connected to one end of the resistor R209, the anode of the diode D202 and one end of the photoelectric coupler PC101-A, the other end of the photoelectric coupler PC101-A is respectively connected to the other end of the resistor R209 and one end of the resistor R207, the other end of the resistor R207 is connected to one end of the resistor R216. The second pin of the operational amplifier U202-A is respectively connected to one end of the capacitor C204, the other end of the capacitor C205, one end of the resistor R212, one end of the resistor R213 and one end of the resistor R214, and the other end of the capacitor C204 is connected to the other end of the resistor R215; The third pin of the operational amplifier U202-A is connected to one end of the capacitor C215, the other end of the capacitor C215 is respectively connected to the fourth pin of the operational amplifier U202-A, the other end of the resistor R213, the other end of the resistor R214, one end of the capacitor C207 and one end of the resistor R228, the other end of the resistor R228 is connected to the fifth pin of the operational amplifier U203-B, and the sixth pin of the operational amplifier U203-B is connected to the seventh pin of the operational amplifier U203-B; The first pin of the operational amplifier U203-A is respectively connected to one end of the resistor R211 and one end of the resistor R219, the second pin of the operational amplifier U203-A is respectively connected to the other end of the resistor R219 and one end of the resistor R220, the other end of the resistor R220 is respectively connected to the fourth pin of the operational amplifier U203-A, one end of the capacitor C213, one end of the resistor RT301 and the fifth pin of the interface CN301, and the third pin of the operational amplifier U203-A is connected to one end of the resistor R221; The fifth pin of the operational amplifier U202-B is respectively connected to the other end of the capacitor C213, the other end of the resistor RT301 and the third pin of the interface CN301, the sixth pin of the operational amplifier U203-B is respectively connected to the other end of the resistor R211, one end of the capacitor C208 and one end of the capacitor C209, the other end of the capacitor C209 is connected to one end of the resistor R218, the other end of the resistor R218 is respectively connected to the other end of the capacitor C208, one end of the resistor R217 and the seventh pin of the operational amplifier U203-B, and the other end of the resistor R217 is connected to the negative electrode of the diode D202.