Intelligent constant-current LED drive circuit

Abstract

The utility model discloses an intelligent constant current LED drive circuit, which relates to the technical field of LEDs, and comprises a power supply module used for power supply control; the power supply control module is used for electric energy transmission and power-off protection; the constant-current driving module is used for carrying out constant-current adjustment processing; the first LED module is used for lighting and current sampling; the second LED module is used for lighting and current sampling; the feedback control module is used for transmitting a signal sampled by the first LED module or the second LED module to the constant current driving module; and the fault detection module is used for carrying out overcurrent detection on the first LED module and the second LED module, controlling the power-off work of the power supply control module, controlling the standby illumination work of the standby LED module, controlling the power-off work of the first LED module and controlling the signal switching work of the feedback control module. The intelligent constant-current LED drive circuit can improve the lighting efficiency and the circuit safety.

Description

Technical Field

[0001] The utility model relates to the technical field of LED, in particular to an intelligent constant-current LED driving circuit. Background Technique

[0002] LED is a non-linear component and is vulnerable to voltage fluctuations and other factors. Therefore, constant-current driving is generally adopted. The constant-current LED driving circuits in the prior art generally use relevant constant-current drivers to complete the driving control of multiple groups of parallel-connected LED components of the same type. However, since only one group of LED components is sampled for feedback, when a fault occurs in the sampled LED components, the constant-current LED driving circuit will be unable to continue driving the LED components, reducing the lighting efficiency and the circuit safety is relatively low. Therefore, it needs to be improved. Content of the Utility Model

[0003] The embodiment of the utility model provides an intelligent constant-current LED driving circuit to solve the problems raised in the above background technique.

[0004] To achieve the above object, the utility model provides the following technical solutions:

[0005] An intelligent constant-current LED driving circuit, comprising: a power supply module, a power supply control module, a constant-current driving module, a first LED module, a second LED module, a feedback control module, a fault detection module, and a standby LED module;

[0006] The power supply module is used for accessing AC electric energy and performing step-down, rectification filtering, and voltage stabilization processing on the AC electric energy;

[0007] The power supply control module is connected to the power supply module and the fault detection module, and is used for transmitting the electric energy output by the power supply module and outputting a first electric energy, and stopping outputting the first electric energy when receiving a first protection signal and a second protection signal output by the fault detection module;

[0008] The constant-current driving module is connected to the power supply control module and the feedback control module, and is used for receiving a first feedback signal or a second feedback signal transmitted by the feedback control module and performing constant-current regulation processing on the first electric energy, and outputting a second electric energy;

[0009] The first LED module is connected to the constant-current driving module, and is used for receiving the second electric energy and performing lighting work, and is used for current sampling and outputting a first feedback signal;

[0010] The second LED module is connected to the constant-current driving module, and is used for receiving the second electric energy and performing lighting work, and is used for current sampling and outputting a second feedback signal;

[0011] A feedback control module, connected to the first LED module, the second LED module and the fault detection module, is configured to transmit a first feedback signal to the constant current drive module, and stop transmitting the first feedback signal and transmit a second feedback signal to the constant current drive module when receiving a first protection signal output by the fault detection module;

[0012] A fault detection module, connected to the first LED module and the second LED module, is configured to set a first voltage threshold and a second voltage threshold, perform current-voltage conversion on the first feedback signal and output a first voltage signal, perform current-voltage conversion on the second feedback signal and output a second voltage signal, perform signal self-locking and output a first protection signal when the first voltage signal is greater than the first voltage threshold, and output a second protection signal when the second voltage signal is greater than the second voltage threshold;

[0013] A spare LED module, connected to the constant current drive module and the fault detection module, is configured to receive a second electric energy and perform lighting work when receiving the first protection signal.

[0014] As a further solution of the present invention: The constant current drive module includes a first inductor, a first diode, a first driver and a second capacitor;

[0015] Preferably, the first end of the first inductor and the LX end of the first driver are both connected to the power control module, the second end of the first inductor is connected to the anode of the first diode, the cathode of the first diode is connected to the CE end of the first driver, the OUT of the first driver, the first LED module, the second LED module and the spare LED module and grounded through the second capacitor, the GND end of the first driver is grounded, and the FB end of the first driver is connected to the feedback control module.

[0016] As a further solution of the present invention: The first LED module includes a second resistor, a first power transistor, a first switch transistor, a first LED module group and a fourth resistor; The second LED module includes a first resistor, a second LED module group and a fifth resistor;

[0017] Preferably, the drain of the first power transistor is connected to the OUT end of the first driver and one end of the first resistor and connected to the gate of the first power transistor and the collector of the first switch transistor through the second resistor, the emitter of the first switch transistor is grounded, the source of the first power transistor is connected to the first end of the first LED module group, the second end of the first LED module group is grounded through the fourth resistor, the other end of the first resistor is connected to the first end of the second LED module group, the second end of the second LED module group is grounded through the fifth resistor, and the base of the first switch transistor is connected to the fault detection module.

[0018] As a further solution of the present invention: The feedback control module includes a first power supply, a third resistor, a second switch transistor and a first analog switch;

[0019] Preferably, the first power supply is connected to the collector of the second switching transistor and the fifth terminal of the first analog switch through a third resistor. The third terminal and the eighth terminal of the first analog switch are both connected to the FB terminal of the first driver. The fourth terminal of the first analog switch is connected to the second terminal of the first LED module. The ninth terminal of the first analog switch is connected to the second terminal of the first LED module. The sixth terminal of the first analog switch is connected to the base of the second switching transistor, and the emitter of the second switching transistor is grounded.

[0020] As a further solution of the present invention: The fault detection module includes a sixth resistor, a third diode, a first potentiometer, a second diode, a third switching transistor, a second power supply, a seventh resistor, a fourth diode, a second potentiometer, and a fifth diode;

[0021] Preferably, the anode of the third diode is connected to the second terminal of the first LED module through a sixth resistor. The cathode of the third diode is connected to one end of the first potentiometer. The other end and the sliding terminal of the first potentiometer are both connected to the cathode of the second diode and the emitter of the third switching transistor. The base of the third switching transistor is connected to the anode of the second diode, the base of the first switching transistor, the base of the second switching transistor, and the spare LED module. The anode of the fourth diode is connected to the second terminal of the second LED module through a seventh resistor. The cathode of the fourth diode is connected to the sliding terminal of the second potentiometer and the cathode of the fifth diode through the second potentiometer. The anode of the fifth diode is connected to the power supply control module.

[0022] As a further solution of the present invention: The spare LED module includes a second power transistor, a spare LED module, and an eighth resistor;

[0023] Preferably, the drain of the second power transistor is connected to the OUT terminal of the first driver. The source of the second power transistor is connected to one end of the spare LED module. The other end of the spare LED module is grounded through an eighth resistor.

[0024] As a further solution of the present invention: The power supply module includes a power supply interface, a power supply processing device, and a first capacitor; The power supply control module includes a ninth resistor, a third power transistor, a seventh diode, a sixth diode, a first logic chip, and a fourth switching transistor;

[0025] Preferably, the first end and the second end of the power interface are respectively connected to the first end and the second end of the power processing device. The third end of the power processing device is connected to one end of the first capacitor and the drain of the third power transistor, and is connected to the gate of the third power transistor and the collector of the fourth switching transistor through the ninth resistor. The base of the fourth switching transistor is connected to the anode of the seventh diode and the F terminal of the first logic chip. The emitter of the fourth switching transistor is grounded. The source of the third power transistor is connected to the LX terminal of the first driver. The cathode of the seventh diode is connected to the cathode of the sixth diode and the A terminal of the first logic chip. The B terminal of the first logic chip is connected to the anode of the second diode. The anode of the sixth diode is connected to the anode of the fifth diode. The emitter of the fourth switching transistor is grounded. The other end of the first capacitor and the other end of the power processing device are both grounded.

[0026] Compared with the prior art, the beneficial effects of the present utility model are as follows: The intelligent constant-current LED driving circuit of the present utility model can perform constant-current regulation processing on the electric energy processed by the power supply module transmitted by the constant-current driving module to the power supply control module, and complete the driving control of the first LED module and the second LED module. The fault detection module can perform overcurrent detection on the first LED module, and when an overcurrent occurs, disconnect the operation of the first LED module and control the standby lighting control of the standby LED module. At the same time, the feedback control module will control the constant-current driving module to perform constant-current regulation according to the current state of the second LED module. When the second LED module also appears in an overcurrent state, it will control the power supply control module to perform power-off protection, improving the lighting efficiency and the circuit safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments of the present utility model. Obviously, the following-described drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0028] Figure 1 It is a schematic block diagram of the principle of an intelligent constant-current LED driving circuit provided by an embodiment of the present utility model.

[0029] Figure 2 It is a circuit diagram of an intelligent constant-current LED driving circuit provided by an embodiment of the present utility model.

[0030] Figure 3 It is a connection circuit diagram of the power supply control module provided by an embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] In one embodiment, please refer to Figure 1 , an intelligent constant-current LED driving circuit, comprising: a power supply module 1, a power supply control module 2, a constant-current driving module 3, a first LED module 4, a second LED module 5, a feedback control module 6, a fault detection module 7, and a standby LED module 8;

[0033] Specifically, the power supply module 1 is used to access AC electric energy and perform step-down, rectification filtering, and voltage regulation on the AC electric energy;

[0034] The power supply control module 2 is connected to the power supply module 1 and the fault detection module 7, and is used to transmit the electric energy output by the power supply module 1 and output first electric energy, and stop outputting the first electric energy when receiving the first protection signal and the second protection signal output by the fault detection module 7;

[0035] The constant-current driving module 3 is connected to the power supply control module 2 and the feedback control module 6, and is used to receive the first feedback signal or the second feedback signal transmitted by the feedback control module 6 and perform constant-current regulation on the first electric energy, and output second electric energy;

[0036] The first LED module 4 is connected to the constant-current driving module 3, and is used to receive the second electric energy and perform lighting work, and is used to perform current sampling and output a first feedback signal;

[0037] The second LED module 5 is connected to the constant-current driving module 3, and is used to receive the second electric energy and perform lighting work, and is used to perform current sampling and output a second feedback signal;

[0038] The feedback control module 6 is connected to the first LED module 4, the second LED module 5, and the fault detection module 7, and is used to transmit the first feedback signal to the constant-current driving module 3, and stop transmitting the first feedback signal and transmit the second feedback signal to the constant-current driving module 3 when receiving the first protection signal output by the fault detection module 7;

[0039] A fault detection module 7, connected to the first LED module 4 and the second LED module 5, is configured to set a first voltage threshold and a second voltage threshold, perform current-voltage conversion on the first feedback signal and output a first voltage signal, perform current-voltage conversion on the second feedback signal and output a second voltage signal, perform signal self-locking and output a first protection signal when the first voltage signal is greater than the first voltage threshold, and output a second protection signal when the second voltage signal is greater than the second voltage threshold;

[0040] A standby LED module 8, connected to the constant current driving module and the fault detection module 7, is configured to receive the second electric energy and perform lighting work when receiving the first protection signal.

[0041] In a specific embodiment, the above power supply module 1 can adopt a power supply circuit composed of a power supply interface, a power supply processing device, and a capacitor, which can access AC electric energy and perform step-down, rectification filtering, and voltage regulation processing on the AC electric energy; the above power supply control module 2 can select a power supply control circuit composed of a power transistor, a logic chip, a diode, etc., which can perform electric energy transmission control and perform power-off protection when the fault detection module 7 detects that both the first LED module 4 and the second LED module 5 are overcurrent; the above constant current driving module 3 can adopt a constant current driving circuit composed of a constant current driver, an inductor, a diode, etc., which can perform constant current regulation processing on the electric energy transmitted by the power supply control module 2 according to the signal fed back by the feedback control module 6; the above first LED module 4 can adopt a first LED circuit composed of a power transistor, an LED module, a triode, etc., which can perform lighting control and sample the current during the lighting work; the above second LED module 5 can adopt a second LED circuit composed of a resistor and an LED module, which can perform lighting control and sample the current during the lighting work; the above feedback control module 6 can adopt a feedback control circuit composed of an analog switch, a triode, a resistor, etc., which can feed back the signal sampled by the first LED module 4 to the constant current driving module 3, and feed back the signal sampled by the second LED module 5 to the constant current driving module 3 after receiving the signal output by the fault detection module 7; the above fault detection module 7 can adopt a fault detection circuit composed of a diode, a triode, a potentiometer, etc., which can respectively judge overcurrent of the first LED module 4 and the second LED module 5; the above standby LED module 8 can select a standby LED circuit composed of a standby LED module, a power transistor, and a resistor to perform standby lighting work.

[0042] In another embodiment, please refer to Figure 1 、 Figure 2 and Figure 3 The constant current driving module 3 includes a first inductor L1, a first diode D1, a first driver IC1, and a second capacitor C2;

[0043] Specifically, the first end of the first inductor L1 and the LX terminal of the first driver IC1 are both connected to the power control module 2. The second end of the first inductor L1 is connected to the anode of the first diode D1. The cathode of the first diode D1 is connected to the CE terminal of the first driver IC1, the OUT of the first driver IC1, the first LED module 4, the second LED module 5, and the standby LED module 8 and grounded through the second capacitor C2. The GND terminal of the first driver IC1 is grounded. The FB terminal of the first driver IC1 is connected to the feedback control module 6.

[0044] In a specific embodiment, the above-mentioned first driver IC1 can be selected as the LY2106 driver.

[0045] Further, the first LED module 4 includes a second resistor R2, a first power transistor Q1, a first switching transistor V1, a first LED module group, and a fourth resistor R4; the second LED module 5 includes a first resistor R1, a second LED module group, and a fifth resistor R5.

[0046] Specifically, the drain of the first power transistor Q1 is connected to the OUT terminal of the first driver IC1 and one end of the first resistor R1 and is connected to the gate of the first power transistor Q1 and the collector of the first switching transistor V1 through the second resistor R2. The emitter of the first switching transistor V1 is grounded. The source of the first power transistor Q1 is connected to the first end of the first LED module group. The second end of the first LED module group is grounded through the fourth resistor R4. The other end of the first resistor R1 is connected to the first end of the second LED module group. The second end of the second LED module group is grounded through the fifth resistor R5. The base of the first switching transistor V1 is connected to the fault detection module 7.

[0047] In a specific embodiment, the above-mentioned first power transistor Q1 can be selected as an N-channel field effect transistor; the above-mentioned first switching transistor V1 can be selected as an NPN type triode; the above-mentioned fourth resistor R4 and fifth resistor R5 both perform current sampling; the number of series-connected LEDs and the LED models of the first LED module group are the same as those of the second LED module group.

[0048] Further, the feedback control module 6 includes a first power supply VCC1, a third resistor R3, a second switching transistor V2, and a first analog switch IC2.

[0049] Specifically, the first power supply VCC1 is connected to the collector of the second switching transistor V2 and the fifth terminal of the first analog switch IC2 through the third resistor R3. The third terminal and the eighth terminal of the first analog switch IC2 are both connected to the FB terminal of the first driver IC1. The fourth terminal of the first analog switch IC2 is connected to the second end of the first LED module group. The ninth terminal of the first analog switch IC2 is connected to the second end of the first LED module group. The sixth terminal of the first analog switch IC2 is connected to the base of the second switching transistor V2. The emitter of the second switching transistor V2 is grounded.

[0050] In a specific embodiment, the first analog switch IC2 can be selected as the CD4066 chip, and the fifth terminal of the first analog switch IC2 is controlled by the first power supply VCC1 and the third resistor R3 to maintain a high-level state; the second switching transistor V2 can be selected as an NPN-type triode.

[0051] Further, the fault detection module 7 includes a sixth resistor R6, a third diode D3, a first potentiometer RP1, a second diode D2, a third switching transistor V3, a second power supply VCC2, a seventh resistor R7, a fourth diode D4, a second potentiometer RP2, and a fifth diode D5;

[0052] Specifically, the anode of the third diode D3 is connected to the second terminal of the first LED module through the sixth resistor R6, the cathode of the third diode D3 is connected to one end of the first potentiometer RP1, the other end and the sliding terminal of the first potentiometer RP1 are both connected to the cathode of the second diode D2 and the emitter of the third switching transistor V3, the base of the third switching transistor V3 is connected to the anode of the second diode D2, the base of the first switching transistor V1, the base of the second switching transistor V2, and the standby LED module 8, the anode of the fourth diode D4 is connected to the second terminal of the second LED module through the seventh resistor R7, the cathode of the fourth diode D4 is connected to the sliding terminal of the second potentiometer RP2 and the cathode of the fifth diode D5 through the second potentiometer RP2, and the anode of the fifth diode D5 is connected to the power supply control module 2.

[0053] In a specific embodiment, both the seventh resistor R7 and the sixth resistor R6 convert the sampled signal into a voltage signal; the second voltage threshold set by the second potentiometer RP2 and the fifth resistor R5, the first voltage threshold set by the second diode D2 and the first potentiometer RP1, and the first voltage threshold and the second voltage threshold are equal and both serve as the overcurrent detection limit; the third switching transistor V3 can be selected as an NPN-type triode to cooperate with the second power supply VCC2 to maintain the breakdown state of the second diode D2.

[0054] Further, the standby LED module 8 includes a second power transistor Q2, a standby LED module, and an eighth resistor R8;

[0055] Specifically, the drain of the second power transistor Q2 is connected to the OUT terminal of the first driver IC1, the source of the second power transistor Q2 is connected to one end of the standby LED module 8, and the other end of the standby LED module is grounded through the eighth resistor R8.

[0056] In a specific embodiment, the second power transistor Q2 can be selected as an N-channel field effect transistor; the number of LEDs in series and the LED model of the standby LED module are the same as those of the second LED module.

[0057] Further, the power supply module 1 includes a power supply interface, a power supply processing device, and a first capacitor C1; the power supply control module 2 includes a ninth resistor R9, a third power transistor Q3, a seventh diode D7, a sixth diode D6, a first logic chip IC3, and a fourth switching transistor V4;

[0058] Specifically, the first end and the second end of the power supply interface are respectively connected to the first end and the second end of the power supply processing device. The third end of the power supply processing device is connected to one end of the first capacitor C1 and the drain of the third power transistor Q3, and is connected to the gate of the third power transistor Q3 and the collector of the fourth switching transistor V4 through the ninth resistor R9. The base of the fourth switching transistor V4 is connected to the anode of the seventh diode D7 and the F terminal of the first logic chip IC3. The emitter of the fourth switching transistor V4 is grounded. The source of the third power transistor Q3 is connected to the LX terminal of the first driver IC1. The cathode of the seventh diode D7 is connected to the cathode of the sixth diode D6 and the A terminal of the first logic chip IC3. The B terminal of the first logic chip IC3 is connected to the anode of the second diode D2. The anode of the sixth diode D6 is connected to the anode of the fifth diode D5. The emitter of the fourth switching transistor V4 is grounded. The other end of the first capacitor C1 and the other end of the power supply processing device are both grounded.

[0059] In a specific embodiment, the above-mentioned power supply processing device may be composed of a transformer, a rectifier, a capacitor, and a voltage regulator; the above-mentioned third power transistor Q3 may be an N-channel field effect transistor; the above-mentioned fourth switching transistor V4 may be an NPN type triode; the above-mentioned first logic chip IC3 may be an AND gate chip. Cooperating with the seventh diode D7 and the sixth diode D6, when the B terminal of the first logic chip IC3 is in a high level state, the signal with a high level input to the A terminal of the first logic chip IC3 can be self-locked.

[0060] In an intelligent constant-current LED driving circuit according to this embodiment, AC electrical energy is accessed through a power supply interface. The power supply processing device steps down, rectifies, filters, and stabilizes the AC electrical energy, and transmits it to the first driver IC1 through the third power transistor Q3. At this time, the first power supply VCC1 provides a high level to the fifth terminal of the first analog switch IC2 through the third resistor R3. The first analog switch IC2 transmits the current signal sampled by the fourth resistor R4 to the FB terminal of the first driver IC1, so that the first driver IC1 cooperates with the first inductor L1, the first diode D1, and the second capacitor C2 to perform constant-current regulation processing on the input electrical energy, so as to provide the same constant-current electrical energy to the first LED module and the second LED module through the first power transistor Q1 and the first resistor R1. The first voltage threshold is set by the first potentiometer RP1 and the second diode D2. The signal sampled by the fourth resistor R4 is converted by the sixth diode D6 and transmitted through the third diode D3. When the transmitted signal is greater than the first voltage threshold, the second power transistor Q2, the third switch transistor V3, the second switch transistor V2, and the first switch transistor V1 are turned on, and the second power supply VCC2 continuously breaks down the second diode D2, so that the B terminal of the first logic chip IC3 becomes high level, and the standby LED module starts to illuminate. At the same time, the first analog switch IC2 transmits the signal sampled by the fifth resistor R5 to the FB terminal of the first driver IC1 to maintain the constant-current regulation operation. If the signal sampled by the fifth resistor R5 is greater than the second voltage threshold set by the second potentiometer RP2 and the fifth resistor R5 after being processed by the seventh resistor R7 and the fourth diode D4 at this time, the F terminal of the first logic chip IC3 will output a high level and control the fourth switch transistor V4 to turn on, and the third power transistor Q3 will turn off to perform power-off protection work.

[0061] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0062] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An intelligent constant current LED driving circuit, characterized in that: The intelligent constant current LED driving circuit comprises: a power module, a power control module, a constant current driving module, a first LED module, a second LED module, a feedback control module, a fault detection module and a spare LED module; The power supply module is used to receive AC power and perform voltage reduction, rectification, filtering and voltage stabilization on the AC power; The power control module is connected to the power module and the fault detection module, and is used to transmit the power output by the power module and output the first power, and stop outputting the first power when receiving the first protection signal and the second protection signal output by the fault detection module; The constant current driving module is connected to the power control module and the feedback control module, and is used to receive the first feedback signal or the second feedback signal transmitted by the feedback control module and perform constant current regulation processing on the first electric energy to output the second electric energy; The first LED module is connected to the constant current driving module, and is used to receive the second electric energy and perform lighting work, and is used to perform current sampling and output a first feedback signal; The second LED module is connected to the constant current driving module, and is used to receive the second electric energy and perform lighting work, and is used to perform current sampling and output a second feedback signal; The feedback control module is connected to the first LED module, the second LED module and the fault detection module, and is used to transmit the first feedback signal to the constant current driving module, and when receiving the first protection signal output by the fault detection module, stops transmitting the first feedback signal and transmits the second feedback signal to the constant current driving module; The fault detection module is connected to the first LED module and the second LED module, and is used to set a first voltage threshold and a second voltage threshold, perform current-voltage conversion on the first feedback signal and output the first voltage signal, perform current-voltage conversion on the second feedback signal and output the second voltage signal, perform signal self-locking and output the first protection signal when the first voltage signal is greater than the first voltage threshold, and output the second protection signal when the second voltage signal is greater than the second voltage threshold; The standby LED module is connected to the constant current driving module and the fault detection module, and is used to receive the second electric energy and perform lighting work when receiving the first protection signal.

2. The intelligent constant current LED driving circuit according to claim 1, characterized in that: The constant current driving module includes a first inductor, a first diode, a first driver and a second capacitor; The first end of the first inductor and the LX end of the first driver are both connected to the power control module, the second end of the first inductor is connected to the anode of the first diode, the cathode of the first diode is connected to the CE end of the first driver, the OUT of the first driver, the first LED module, the second LED module and the spare LED module and are grounded through the second capacitor, the GND end of the first driver is grounded, and the FB end of the first driver is connected to the feedback control module.

3. The intelligent constant current LED driving circuit according to claim 2, characterized in that: The first LED module includes a second resistor, a first power tube, a first switch tube, a first LED module and a fourth resistor; the second LED module includes a first resistor, a second LED module and a fifth resistor; The drain of the first power tube is connected to the OUT end of the first driver and one end of the first resistor and is connected to the gate of the first power tube and the collector of the first switch tube through the second resistor, the emitter of the first switch tube is grounded, the source of the first power tube is connected to the first end of the first LED module, the second end of the first LED module is grounded through the fourth resistor, the other end of the first resistor is connected to the first end of the second LED module, the second end of the second LED module is grounded through the fifth resistor, and the base of the first switch tube is connected to the fault detection module.

4. The intelligent constant current LED driving circuit according to claim 3, characterized in that: The feedback control module includes a first power supply, a third resistor, a second switch tube and a first analog switch; The first power supply is connected to the collector of the second switch tube and the fifth end of the first analog switch through the third resistor, the third end and the eighth end of the first analog switch are both connected to the FB end of the first driver, the fourth end of the first analog switch is connected to the second end of the first LED module, the ninth end of the first analog switch is connected to the second end of the first LED module, the sixth end of the first analog switch is connected to the base of the second switch tube and the emitter of the second switch tube.

5. The intelligent constant current LED driving circuit according to claim 4, characterized in that: The fault detection module includes a sixth resistor, a third diode, a first potentiometer, a second diode, a third switch tube, a second power supply, a seventh resistor, a fourth diode, a second potentiometer and a fifth diode; The anode of the third diode is connected to the second end of the first LED module through the sixth resistor, the cathode of the third diode is connected to one end of the first potentiometer, the other end and the slider end of the first potentiometer are connected to the cathode of the second diode and the emitter of the third switch tube, the base of the third switch tube is connected to the anode of the second diode, the base of the first switch tube, the base of the second switch tube and the spare LED module, the anode of the fourth diode is connected to the second end of the second LED module through the seventh resistor, the cathode of the fourth diode is connected to the slider end of the second potentiometer and the cathode of the fifth diode through the second potentiometer, and the anode of the fifth diode is connected to the power control module.

6. The intelligent constant current LED driving circuit according to claim 5, characterized in that: The standby LED module includes a second power tube, a standby LED module and an eighth resistor; The drain of the second power tube is connected to the OUT terminal of the first driver, the source of the second power tube is connected to one end of the standby LED module, and the other end of the standby LED module is grounded through an eighth resistor.

7. The intelligent constant current LED driving circuit according to claim 5, characterized in that: The power module includes a power interface, a power processing device and a first capacitor; the power control module includes a ninth resistor, a third power tube, a seventh diode, a sixth diode, a first logic chip and a fourth switch tube; The first end and the second end of the power interface are respectively connected to the first end and the second end of the power processing device, the third end of the power processing device is connected to one end of the first capacitor and the drain of the third power tube and is connected to the gate of the third power tube and the collector of the fourth switch tube through the ninth resistor, the base of the fourth switch tube is connected to the anode of the seventh diode and the F end of the first logic chip, the emitter of the fourth switch tube is grounded, the source of the third power tube is connected to the LX end of the first driver, the cathode of the seventh diode is connected to the cathode of the sixth diode and the A end of the first logic chip, the B end of the first logic chip is connected to the anode of the second diode, the anode of the sixth diode is connected to the anode of the fifth diode, the emitter of the fourth switch tube is grounded, and the other end of the first capacitor and the other end of the power processing device are both grounded.

Images