CN219421095U

CN219421095U - LED driving circuit

Info

Publication number: CN219421095U
Application number: CN202223014202.0U
Authority: CN
Inventors: 丁炜; 周俊
Original assignee: On Bright Electronics Shanghai Co Ltd
Current assignee: On Bright Electronics Shanghai Co Ltd
Priority date: 2022-11-11
Filing date: 2022-11-11
Publication date: 2023-07-25
Anticipated expiration: 2032-11-11
Also published as: TWM641108U

Abstract

The utility model provides an LED driving circuit. The LED driving circuit comprises a power factor correction power supply circuit, an LED function control circuit and a flyback circuit. The LED function control circuit includes a gallium nitride transistor. The first terminal of the power factor correction power supply circuit is connected to the first terminal of the LED function control circuit, the second terminal is connected to the second terminal of the LED function control circuit and the first terminal of the flyback circuit, and the third terminal and the fourth terminal are connected to the reference ground of the LED drive circuit. The third terminal of the LED function control circuit is connected to the second terminal of the flyback circuit, the fourth terminal is connected to the reference ground, and the source electrode and the drain electrode of the gallium nitride transistor are respectively connected to the third terminal and the fourth terminal of the LED function control circuit. The third and fourth terminals of the flyback circuit are connected across the LED load, respectively. The LED driving circuit provided by the utility model has the advantages of smaller power consumption and higher working efficiency.

Description

LED driving circuit

Technical Field

The utility model relates to the field of circuits, in particular to an LED driving circuit.

Background

LEDs are now widely used in various fields, and accordingly LED driving circuits are also widely used.

However, the general LED driving circuit requires a large driving current, so that the power consumption of the LED driving circuit is large, and furthermore, the switching frequency of the general LED driving circuit is low, resulting in low efficiency of the LED driving circuit.

Therefore, an LED driving circuit capable of improving circuit performance is required.

Disclosure of Invention

According to an exemplary embodiment of the present utility model, there is provided an LED driving circuit including a power factor correction power supply circuit, an LED function control circuit including a gallium nitride transistor, and a flyback circuit, wherein: a first terminal of the power factor correction power supply circuit is connected to a first terminal of the LED function control circuit, a second terminal of the power factor correction power supply circuit is connected to a second terminal of the LED function control circuit and a first terminal of the flyback circuit, and a third terminal and a fourth terminal of the power factor correction power supply circuit are connected to a reference ground of the LED drive circuit; a third terminal of the LED function control circuit is connected to the second terminal of the flyback circuit, a fourth terminal of the LED function control circuit is connected to the reference ground, and a source electrode and a drain electrode of the gallium nitride transistor are respectively connected to the third terminal and the fourth terminal of the LED function control circuit; the third terminal and the fourth terminal of the flyback circuit are respectively connected to two ends of the LED load.

According to the LED driving circuit of the exemplary embodiment of the utility model, the gallium nitride transistor is used to have smaller driving current and higher switching power, so that the LED driving circuit can have smaller power consumption and higher working efficiency, and the cost of the LED driving circuit is reduced.

Drawings

The utility model will be better understood from the following description of specific embodiments thereof, taken in conjunction with the accompanying drawings, in which:

fig. 1 shows a circuit diagram of an LED driving circuit according to an exemplary embodiment of the present utility model.

Fig. 2 shows a block diagram of a control chip of an LED driving circuit according to an exemplary embodiment of the present utility model.

Fig. 3 shows a graph of a voltage signal at a power supply input pin of a control chip of an LED driving circuit according to an exemplary embodiment of the present utility model.

Fig. 4 shows a graph of a voltage signal associated with an inductor current sense pin of a control chip of an LED driving circuit according to an exemplary embodiment of the present utility model.

Fig. 5 shows a graph of an overvoltage protection voltage signal of a control chip of an LED driving circuit according to an exemplary embodiment of the present utility model.

Detailed Description

Features and exemplary embodiments of various aspects of the utility model are described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the utility model. It will be apparent, however, to one skilled in the art that the present utility model may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the utility model by showing examples of the utility model. The present utility model is in no way limited to any particular configuration and algorithm set forth below, but rather covers any modification, substitution, and improvement of elements, components, and algorithms without departing from the spirit of the utility model. In the drawings and the following description, well-known structures and techniques have not been shown in order to avoid unnecessarily obscuring the present utility model.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.

Fig. 1 shows a circuit diagram of an LED driving circuit 100 according to an exemplary embodiment of the present utility model.

As shown in fig. 1, an LED driving circuit 100 according to an embodiment of the present utility model includes a Power Factor Correction (PFC) power supply circuit 110, an LED function control circuit 120, and a flyback circuit 130. The LED driving circuit 100 is configured to be connected to an LED load 200 to supply power to the LED load 200.

LED function control circuit 120 includes gallium nitride transistors GaN.

In one embodiment, the LED function control circuit 120 includes a control chip U1, and a gallium nitride transistor GaN is included in the control chip U1 (which will be described in detail below).

The first terminal N11 (pfc_vcc) of the power factor correction power supply circuit 110 is connected to the first terminal N21 of the LED function control circuit 120, the second terminal N12 (pfc_vout) of the power factor correction power supply circuit 110 is connected to the second terminal N22 of the LED function control circuit 120 and the first terminal N31 of the flyback circuit 130, and the third terminal N13 and the fourth terminal N14 of the power factor correction power supply circuit 110 are connected to the reference ground of the LED driving circuit 100.

The third terminal N23 of the LED function control circuit 120 is connected to the second terminal N32 of the flyback circuit 130, and the fourth terminal N24 of the LED function control circuit 120 is connected to the reference ground. The source and drain of the gallium nitride transistor GaN are connected to the third terminal N23 and the fourth terminal N24 of the LED function control circuit 120, respectively.

The third terminal N33 and the fourth terminal N44 of the flyback circuit 130 are connected across the LED load 200, respectively.

For ease of description, the various connection terminals are shown in the circuit of fig. 1 as nodes N11-N34, it being understood that in an actual circuit these nodes may be located at different locations than those shown in fig. 1, and that in an actual circuit at least one of these nodes may not be present.

Referring to fig. 1 and 2, fig. 2 shows a block diagram of a control chip U1 of an LED driving circuit 100 according to an exemplary embodiment of the present utility model.

In one embodiment, the control chip U1 may include: the DRAIN pin DRAIN of the gallium nitride transistor and the primary inductor current detection pin CS are integrated.

The integrated gallium nitride transistor DRAIN pin DRAIN is connected to the DRAIN of the gallium nitride transistor GaN and to the second terminal N32 of the flyback circuit 130 (i.e., to the third terminal N23 of the LED function control circuit 120).

The primary inductor current sense pin CS is connected to the source of the gallium nitride transistor GaN and to ground (i.e., to the fourth terminal N24 of the LED function control circuit 120) via the first resistor junction R1 of the LED function control circuit 120. The primary inductance is the primary inductance Np of the transformer T1 of the flyback circuit 130.

In one embodiment, the control chip U1 may further include: CS voltage detection and leading edge blanking module 120-1. The first terminal of the CS voltage sense and leading edge blanking module 120-1 is connected to the primary inductor current sense pin CS.

In one embodiment, the control chip U1 may further include: a power supply input pin VDD and a high voltage supply pin HV.

The power supply input pin VDD is connected to the first terminal N11 of the power factor correction power supply circuit 110, and is connected to the third terminal N13 and the fourth terminal N14 of the power factor correction power supply circuit 110 via the first capacitor C1 of the LED function control circuit 120.

The high voltage supply pin HV is connected to the second terminal N12 of the pfc power supply circuit 110 and the first terminal N31 of the flyback circuit via the second resistor R2 of the LED function control circuit 120.

In one embodiment, the control chip U1 may further include: a Junction Field Effect Transistor (JFET) power module 120-2 has a first terminal connected to the power input pin VDD and a second terminal connected to the high voltage power supply pin HV.

In one embodiment, the control chip U1 may further include: the output overvoltage setting pin OVP and the chip power supply ground GND.

The output overvoltage setting pin OVP is connected to the reference ground via a third resistor R3 of the LED function control circuit 120.

The chip power ground GND is connected to the reference ground.

In one embodiment, the control chip U1 may further include: line voltage and output voltage current compensation module 120-3, output voltage differential detection module 120-4, and comparator (CPM 1) 120-5.

The first terminal of the line voltage and output voltage current compensation module 120-3 is connected to the high voltage supply pin HV.

The output voltage differential detection module 120-4 has a first terminal connected to the DRAIN pin DRAIN of the integrated gallium nitride transistor, a second terminal connected to the second terminal of the line voltage and output voltage current compensation module 120-3, and a third terminal connected to the high voltage supply pin HV.

The first terminal of the comparator 120-5 is connected to the fourth terminal of the output voltage differential detection module 120-4 and the second terminal is connected to the output overvoltage setting pin OVP.

In one embodiment, the control chip U1 may further include: the constant current control module 120-6 has a first terminal connected to the third terminal of the line voltage and output voltage current compensation module 120-3 and a second terminal connected to the second terminal of the CS voltage detection and leading edge blanking module 120-1.

In one embodiment, the control chip U1 may further include: a temperature current compensation module 120-7 and a demagnetization detection module 120-8.

A first terminal of the temperature current compensation module 120-7 is connected to a third terminal of the constant flow control module 120-6.

The demagnetizing detection module 120-8 has a first terminal connected to the DRAIN pin DRAIN of the integrated gallium nitride transistor and a second terminal connected to the fourth terminal of the constant flow control module 120-6.

In one embodiment, the control chip U1 may further include: the overcurrent protection module 120-9, the logic control module 120-10, and the driving module 120-11.

The first terminal of the over-current protection module 120-9 is connected to the second terminal of the CS voltage detection and leading edge blanking module 120-1.

The first terminal of the logic control module 120-10 is connected to the third terminal of the comparator 120-5, the second terminal is connected to the fifth terminal of the constant flow control module 120-6, and the third terminal is connected to the second terminal of the overcurrent protection module 120-9.

The first terminal of the driving module 120-11 is connected to the fourth terminal of the logic control module 120-10, and the second terminal is connected to the gate of the gallium nitride transistor GaN.

Referring back to fig. 1, in one embodiment, the power factor correction power supply circuit 110 may include: a Power Factor Correction (PFC) power module, a second capacitor C2, and a third capacitor C3.

The second capacitor C2 is connected between the first terminal N11 (having the supply voltage pfc_vcc) and the third terminal N13 of the power factor correction power supply circuit 110.

The third capacitor C3 is connected between the second terminal N12 (having the output voltage pfc_vout) and the fourth terminal N14 of the PFC power supply circuit 110.

The power factor correction power supply module (PFC power supply module) is connected to the first terminal N11 and the second terminal N12 of the power factor correction power supply circuit 110.

In one embodiment, flyback circuit 130 may include: a transformer T1. The transformer T1 may include a primary winding Np and a secondary winding Ns.

The first terminal of the primary winding Np is connected to the first terminal N31 of the flyback circuit 130 and the second terminal of the primary winding Np is connected to the second terminal N32 of the flyback circuit 130.

The first and second terminals of the secondary winding Ns are connected to both ends of the LED load 200.

In one embodiment, flyback circuit 130 may include: a fourth capacitor C4, a first diode D1, a fourth resistor R4, a second diode D2, and a fifth capacitor C5.

The first terminal of the fourth capacitor C4 is connected to the first terminal of the primary winding Np.

The first terminal of the first diode D1 is connected to the second terminal of the fourth capacitor C4, which is connected to the second terminal of the primary winding Np.

The first terminal of the fourth resistor R4 is connected to the first terminal of the primary winding Np and the second terminal is connected to the second terminal of the fourth capacitor C4.

A first terminal of the second diode D2 is connected to a first terminal of the secondary winding Ns, and a second terminal is connected to a first terminal of the LED load 200.

The first terminal of the fifth capacitor C5 is connected to the second terminal of the second diode D2, which is connected to the second terminal of the secondary winding Ns.

The fourth capacitor C4, the first diode D1, and the fourth resistor R4 may form a buffer circuit (snuber Snubber circuit). The second diode D2 and the fifth capacitor C5 may form an output rectifying filter circuit.

According to the LED driving circuit 100 set as described above, the characteristics of small gate charge, small driving current, no reverse recovery time, small switching noise, good linearity of output capacitance, no abrupt change in the rising slope of drain voltage during the turn-off process, small EMC interference, fast turn-off speed, small turn-off loss and the like of the gallium nitride transistor can be utilized, so that the LED driving circuit 100 can have smaller driving current and larger switching frequency, thereby reducing the power consumption of the LED driving circuit, improving the efficiency of the LED driving circuit, thereby helping to realize miniaturization of the transformer, and reducing the system cost and the circuit size.

In a conventional flyback isolated LED non-stroboscopic two-stage lighting system, the switching device is typically a metal-oxide semiconductor field effect transistor, which has the characteristics of larger input capacitance, larger driving current, lower switching frequency (below 100 kHz) and the like, which results in larger power consumption and lower efficiency of the LED driving circuit, thereby resulting in higher cost.

Furthermore, the LED driving circuit according to the present utility model does not require an auxiliary winding for power supply. Also, the LED driving circuit according to the present utility model does not need to provide a separate starting unit in the power factor correction power supply circuit 110 to achieve starting of the circuit. In the LED driving circuit according to the present utility model, the activation of both the power factor correction power supply circuit 110 and the LED function control circuit 120 can be achieved by controlling the JFET power supply module 120-2 in the chip U1, thereby further reducing the cost of the LED driving circuit. The operation of the LED driving circuit will be described below.

Referring to fig. 1 and 2, in a start-up stage after the LED driving circuit 100 is powered on, the high voltage supply pin HV of the control chip U1 receives power, and the JFET power module 120-2 connected to the high voltage supply pin HV charges the first capacitor C2 and the second capacitor C2 of the PFC power circuit 110 of the preceding stage through the power input pin VDD of the control chip U1.

When the voltage at the power supply input pin VDD is greater than the threshold voltage vdd_charge off, the JFET power block 120-2 stops operating. The threshold voltage vdd_charge off may be set to be greater than the start-up threshold voltage V1 of the control chip U1 and greater than the start-up threshold voltage V2 of the PFC power supply circuit 110.

In this manner, the start-up of both the PFC power supply circuit 110 and the LED function control circuit 120 may be achieved by the JFET power supply module 120-2 of the control chip U1.

As shown in fig. 3, the horizontal axis represents time t and the vertical axis represents voltage V at power supply input pin VDD of control chip U1.

At time t1, the voltage at the power input pin VDD is greater than the threshold voltage VDD_charge off, and the JFET power module 120-2 stops operating. The threshold voltage vdd_charge off is greater than the start-up threshold voltage V1 of the control chip U1 and greater than the start-up threshold voltage V2 of the PFC power supply circuit 110.

At time t2, the voltage at the power supply input pin VDD is equal to the supply voltage V3 of the PFC power supply circuit 110, and the PFC power supply circuit 110 supplies power to the LED function control circuit 120 (control chip U1).

It should be understood that the magnitudes of the start-up threshold voltages V1 and V2 in fig. 3 are merely examples, and that there is no correlation between the magnitude of the start-up threshold voltage V1 and the magnitude of the start-up threshold voltage V2.

After the PFC power supply circuit 110 is normally powered using the supply voltage V3, the primary inductor current sense pin CS may sample the voltage across the first resistor R1 to determine the peak current and the output current of the primary inductor Np. Here, by adjusting the resistance value of the first resistor R1, the peak current and the output current of the primary inductor Np can be adjusted.

Fig. 4 shows a graph of a voltage signal related to an inductor current sense leg CS of a control chip of an LED driving circuit according to an exemplary embodiment of the present utility model.

As shown in fig. 4, the horizontal axis represents time t, and the vertical axis represents voltage value V. Vgate is the output voltage of the driving module 120-11 of fig. 2, vcs is the voltage collected by the primary inductor current sense leg CS, and Vds is the voltage between the drain and source of the GaN transistor.

Referring back to fig. 1 and 2, during operation of the LED driving circuit 100, a fixed value of current may flow at the output overvoltage setting pin OVP of the control chip U1, so that the voltage across the third resistor R3 is sampled to determine whether the voltage at the output terminals (N33 and N34) of the LED driving circuit 100 is overvoltage by comparing the sampled voltage with the signal output from the output voltage differential detection module 120-4 via the comparator 120-5. The output of the comparator 120-5 may be provided to the logic control module 120-10 to control the output of the driving module 120-11 to control the on or off of gallium nitride GaN to achieve overvoltage protection.

Here, the threshold value of the overvoltage protection can be adjusted by adjusting the resistance value of the third resistor R3. In addition, a clamping module can be arranged in the control chip U1 to clamp the minimum value Vovp_min and the maximum value Vovp_max of the overvoltage protection threshold value so as to realize more reliable overvoltage protection.

As shown in fig. 5, the horizontal axis represents the resistance value of the third resistor R3, the vertical axis represents the overvoltage protection threshold value, vovp_min is the minimum value of the overvoltage protection threshold value, and vovp_max is the maximum value of the overvoltage protection threshold value. The overvoltage protection threshold is clamped between the minimum value vovp_min and the maximum value vovp_max.

Referring back to fig. 1 and 2, during the operation of the LED driving circuit 100, the CS sampling and front-edge blanking module 120-1 of the control chip U1 may collect the voltages at two ends of the first resistor R1 (i.e., the primary current sampling resistor), filter the peak voltage when the GaN transistor is turned on, and output the CS sampling voltage signal to the chip constant current control module 120-6 and the over-current protection module 120-9, so as to determine the magnitude of the CS current.

The line voltage and output voltage current compensation module 120-3 may detect the line voltage and output a current compensation signal to the constant current control module 120-6.

The temperature current compensation module 120-7 can detect the chip temperature and output a temperature current compensation signal to the constant current control module 120-6.

The demagnetization module 120-8 can detect the demagnetization state of the flyback circuit 130 and output a demagnetization signal to the constant current control module 120-6.

The constant current control module 120-6 can implement constant current control according to the CS sampling voltage signal output by the CS voltage detection and leading edge blanking module 120-1, the current compensation signal output by the line voltage and output voltage current compensation module 120-3, the current compensation signal output by the temperature compensation module 120-7, and the demagnetizing signal detected by the demagnetizing module 120-8, and output a logic control signal to the logic control module 120-10.

The over-current protection module 120-9 may detect the CS sample and the CS sample voltage signal output by the leading edge blanking module 120-1 and output a control signal to the logic control module 120-10.

The logic control module 120-10 may output a driving signal to the driving module according to signals output from the constant current control module 120-6, the overcurrent protection module 120-9 and the comparator 120-5.

The above clamping circuit may be provided in the driving module to show a fixed driving voltage Vgate according to the driving signal outputted from the logic control module 120-10. Therefore, the gate of the gallium nitride transistor is prevented from being damaged due to transient of the driving voltage Vgate, and enough driving current is provided to drive the sealed gallium nitride transistor.

It should be understood that the above components and modules of the LED driving circuit 100 are only examples, and that they may be differently arranged according to actual needs from the above description.

It should be understood that the utility model is not limited to the particular arrangements and instrumentality described above and shown in the drawings. For the sake of brevity, a detailed description of known methods is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method processes of the present utility model are not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between steps, after appreciating the spirit of the present utility model.

The functional blocks shown in the above-described structural block diagrams may be implemented in hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic circuit, an Application Specific Integrated Circuit (ASIC), suitable firmware, a plug-in, a function card, or the like. When implemented in software, the elements of the utility model are the programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine readable medium or transmitted over transmission media or communication links by a data signal carried in a carrier wave. A "machine-readable medium" may include any medium that can store or transfer information. Examples of machine-readable media include electronic circuitry, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio Frequency (RF) links, and the like. The code segments may be downloaded via computer networks such as the internet, intranets, etc.

It should also be noted that the exemplary embodiments mentioned in this disclosure describe some methods or systems based on a series of steps or devices. However, the present utility model is not limited to the order of the above-described steps, that is, the steps may be performed in the order mentioned in the embodiments, or may be performed in a different order from the order in the embodiments, or several steps may be performed simultaneously.

In the foregoing, only the specific embodiments of the present utility model are described, and it will be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the systems, modules and units described above may refer to the corresponding processes in the foregoing method embodiments, which are not repeated herein. It should be understood that the scope of the present utility model is not limited thereto, and any equivalent modifications or substitutions can be easily made by those skilled in the art within the technical scope of the present utility model, and they should be included in the scope of the present utility model.

Claims

1. An LED driving circuit comprising a power factor correction power supply circuit, an LED function control circuit, and a flyback circuit, the LED function control circuit comprising a gallium nitride transistor, wherein:

a first terminal of the power factor correction power supply circuit is connected to a first terminal of the LED function control circuit, a second terminal of the power factor correction power supply circuit is connected to a second terminal of the LED function control circuit and a first terminal of the flyback circuit, and a third terminal and a fourth terminal of the power factor correction power supply circuit are connected to a reference ground of the LED drive circuit;

a third terminal of the LED function control circuit is connected to the second terminal of the flyback circuit, a fourth terminal of the LED function control circuit is connected to the reference ground, and a source electrode and a drain electrode of the gallium nitride transistor are respectively connected to the third terminal and the fourth terminal of the LED function control circuit;

the third terminal and the fourth terminal of the flyback circuit are respectively connected to two ends of the LED load.

2. The LED driving circuit of claim 1, wherein the LED function control circuit comprises a control chip and the gallium nitride transistor is included in the control chip.

3. The LED driving circuit of claim 2, wherein the control chip comprises:

an integrated gallium nitride transistor drain pin connected to the drain of the gallium nitride transistor and to the second terminal of the flyback circuit; and

and the primary side inductance current detection pin is connected to the source electrode of the gallium nitride transistor and is connected to the reference ground through a first resistor of the LED function control circuit, wherein the primary side inductance is a primary side inductance of a transformer of the flyback circuit.

4. The LED driving circuit of claim 3, wherein the control chip further comprises:

and the first terminal of the CS voltage detection and leading edge blanking module is connected to the primary side inductive current detection pin.

5. The LED driving circuit of claim 4, wherein the control chip further comprises:

a power input pin connected to a first terminal of the power factor correction power supply circuit and to third and fourth terminals of the power factor correction power supply circuit via a first capacitance of the LED function control circuit; and

a high voltage power supply pin connected to the second terminal of the power factor correction power supply circuit and the first terminal of the flyback circuit via the second resistor of the LED function control circuit.

6. The LED driving circuit of claim 5, wherein the control chip further comprises:

and the first terminal of the junction field effect transistor power supply module is connected to the power input pin, and the second terminal of the junction field effect transistor power supply module is connected to the high-voltage power supply pin.

7. The LED driving circuit of claim 6, wherein the control chip further comprises:

an output overvoltage setting pin connected to the reference ground via a third resistor of the LED function control circuit; and

and the chip power supply ground pin is connected to the reference ground.

8. The LED driving circuit of claim 7, wherein the control chip further comprises:

a line voltage and output voltage current compensation module having a first terminal connected to the high voltage supply pin;

an output voltage differential detection module, a first terminal of which is connected to the drain pin of the integrated gallium nitride transistor, a second terminal of which is connected to the second terminal of the line voltage and output voltage current compensation module, and a third terminal of which is connected to the high voltage supply pin; and

and the first terminal of the comparator is connected to the fourth terminal of the output voltage differential detection module, and the second terminal of the comparator is connected to the output overvoltage setting pin.

9. The LED driving circuit of claim 8, wherein the control chip further comprises:

and a constant current control module, a first terminal of which is connected to a third terminal of the line voltage and output voltage current compensation module, and a second terminal of which is connected to a second terminal of the CS voltage detection and leading edge blanking module.

10. The LED driving circuit of claim 9, wherein the control chip further comprises:

a temperature current compensation module, a first terminal of which is connected to a third terminal of the constant current control module; and

and the demagnetizing detection module is connected with the drain electrode pin of the integrated gallium nitride transistor through a first terminal and is connected with the fourth terminal of the constant current control module through a second terminal.

11. The LED driving circuit of claim 9, wherein the control chip further comprises:

an overcurrent protection module having a first terminal connected to a second terminal of the CS voltage detection and leading edge blanking module;

a logic control module having a first terminal connected to a third terminal of the comparator, a second terminal connected to a fifth terminal of the constant current control module, and a third terminal connected to a second terminal of the overcurrent protection module; and

and a driving module, a first terminal of which is connected to the fourth terminal of the logic control module, and a second terminal of which is connected to the gate of the gallium nitride transistor.

12. The LED driving circuit of claim 9, wherein the power factor correction power supply circuit comprises:

a second capacitor connected between the first terminal and a third terminal of the power factor correction power supply circuit;

a third capacitor connected between the second terminal and the fourth terminal of the power factor correction power supply circuit; and

a power factor correction power supply module connected to the first and second terminals of the power factor correction power supply circuit.

13. The LED driving circuit of claim 12, wherein the flyback circuit comprises: a transformer comprising a primary winding and a secondary winding,

a first terminal of the primary winding is connected to a first terminal of the flyback circuit, a second terminal of the primary winding is connected to a second terminal of the flyback circuit,

the first and second terminals of the secondary winding are connected to both ends of the LED load.

14. The LED driving circuit of claim 13, wherein the flyback circuit further comprises:

a fourth capacitor having a first terminal connected to the first terminal of the primary winding;

a first diode having a first terminal connected to a second terminal of the fourth capacitor and a second terminal connected to a second terminal of the primary winding;

a fourth resistor having a first terminal connected to the first terminal of the primary winding and a second terminal connected to the second terminal of the fourth capacitor;

a second diode having a first terminal connected to the first terminal of the secondary winding and a second terminal connected to the first terminal of the LED load; and

and a fifth capacitor having a first terminal connected to the second terminal of the second diode and a second terminal connected to the second terminal of the secondary winding.