CN210840134U - LED drive circuit and lighting equipment - Google Patents

Abstract

The embodiment of the utility model provides a LED drive circuit and lighting apparatus are provided to LED drive field. The LED driving circuit comprises an LED array, N LED lamp bead groups connected in parallel, each LED lamp bead group comprises M LED lamp beads connected in series, each LED lamp bead group is used for receiving high-voltage direct current and outputting driving voltage drop, wherein N is more than or equal to 1, and M is more than or equal to 1; the driving circuit comprises a first end, a second end and a third end, the first end is connected with the corresponding LED lamp bead group, and the driving circuit is used for receiving driving voltage drop and outputting constant current; and the current regulating circuits are in one-to-one correspondence with the driving circuits, and each current regulating circuit is connected between the second end and the third end of the corresponding driving circuit and used for regulating the constant current flowing through the LED lamp bead group according to the preset reference voltage of the corresponding driving circuit and the regulating value of the current regulating circuit. The embodiment of the utility model provides a can adjust the size of constant current.

Description

LED drive circuit and lighting equipment

[ technical field ] A method for producing a semiconductor device

The embodiment of the utility model provides a relate to LED drive field, especially relate to a LED drive circuit and lighting apparatus.

[ background of the invention ]

At present, an LED driving circuit outputs a constant current through a driving IC to realize high-voltage linear driving of an LED, but the constant current for driving the LED depends on a rated output current of the driving IC, and the magnitude of the constant current cannot be adjusted according to a luminance requirement of the LED.

[ Utility model ] content

The embodiment of the utility model provides a aim at providing a LED drive circuit and lighting apparatus, its size that can adjust the constant current.

In order to solve the above technical problem, an embodiment of the present invention provides the following technical solution:

the embodiment of the utility model provides a LED drive circuit, include:

the LED array comprises N LED lamp bead groups connected in parallel, each LED lamp bead group comprises M LED lamp beads connected in series, each LED lamp bead group is used for receiving high-voltage direct current and outputting driving voltage drop, wherein N is more than or equal to 1, and M is more than or equal to 1;

the driving circuit comprises a first end, a second end and a third end, the first end is connected with the corresponding LED lamp bead group, and the driving circuit is used for receiving the driving voltage drop and outputting constant current;

and the current regulating circuits are in one-to-one correspondence with the driving circuits, and each current regulating circuit is connected between the second end and the third end of the corresponding driving circuit and is used for regulating the constant current flowing through the LED lamp bead group according to the corresponding preset reference voltage of the driving circuit and the regulating value of the current regulating circuit.

Optionally, the number of the driving circuits is N, and one of the LED lamp bead groups is connected to one of the driving circuits and one of the current adjusting circuits.

Optionally, the driving circuit includes a driving chip.

Optionally, the first end is a positive electrode of the driving chip, the second end is a negative electrode of the driving chip, and the third end is a current sampling end of the driving chip. Optionally, the driving chip includes a current limiting module, where the current limiting module is configured to set the preset reference voltage, detect an input current of the current sampling terminal, and adjust an output current of the anode of the driving chip according to the input current.

Optionally, the current regulating circuit includes a resistor, one end of the resistor is connected to the negative electrode of the driving chip, and the other end of the resistor is connected to the current sampling end.

Optionally, the LED driving circuit further includes a power module, and the power module is connected to the LED array and configured to provide the high-voltage direct current for the LED array.

Optionally, the power module comprises:

the first protection circuit is used for being connected with commercial power;

the rectifying circuit is connected with the first protection circuit and used for converting the commercial power into single-phase pulsating direct current;

and the filter circuit is connected with the rectifying circuit and used for filtering the single-phase pulsating direct current and outputting the high-voltage direct current.

Optionally, the power module further comprises:

a second protection circuit located between the first protection circuit and the rectification circuit;

a third protection circuit between the rectification circuit and the filter circuit.

The embodiment of the utility model provides a still provide a lighting device, include as above arbitrary LED drive circuit.

The utility model has the advantages that: compared with the prior art, the embodiment of the utility model provides a LED drive circuit and lighting apparatus is provided. Through current regulation circuit, with drive circuit one-to-one to according to the preset reference voltage of the drive circuit who corresponds and current regulation circuit's adjustment value, adjust the constant current that flows through LED lamp pearl group, consequently, the embodiment of the utility model provides a can adjust constant current's size, promoted drive circuit's adaptability simultaneously.

[ description of the drawings ]

One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.

Fig. 1 is a schematic structural diagram of an LED driving circuit according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of an LED driving circuit according to another embodiment of the present invention;

fig. 3 is a schematic structural diagram of a power module according to an embodiment of the present invention;

fig. 4 is a schematic circuit connection diagram of an LED driving circuit including a 6 × 15LED array according to an embodiment of the present invention.

[ detailed description ] embodiments

To facilitate an understanding of the present application, the present application is described in more detail below with reference to the accompanying drawings and detailed description. It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In addition, the technical features mentioned in the different embodiments of the present application described below may be combined with each other as long as they do not conflict with each other.

An embodiment of the utility model provides a lighting device, lighting device includes the disclosed LED drive circuit of following arbitrary embodiment. The lighting device adopts LED lighting, and the LED is widely applied to the fields of lamp decoration lighting, LED display, traffic lights, decoration, computers, electronic toy gifts, exchangers, advertisements, urban light engineering and the like.

An embodiment of the utility model provides a lighting apparatus, through LED drive circuit adjusts drive LED's constant current's size, in order to control lighting apparatus's luminance.

Fig. 1 is a schematic structural diagram of an LED driving circuit according to an embodiment of the present invention. As shown, the LED driving circuit 100 includes an LED array 10, a driving circuit 20, and a current regulating circuit 30.

The LED array 10 includes N LED lamp bead groups 101 connected in parallel, each LED lamp bead group 101 includes M LED lamp beads connected in series (e.g., LED11, LED12 … … LEDn1, LEDn2 shown in fig. 1), and each LED lamp bead group 101 is configured to receive high-voltage direct current and output a driving voltage drop, where N is greater than or equal to 1 and M is greater than or equal to 1.

The LED lamp beads are arranged and combined in a matrix manner to form the LED lamp bead group 101, where N and M are positive integers greater than or equal to 1, for example, when N is 1 and M is 1, the LED array 10 includes 1 LED lamp bead group 101, and the LED lamp bead group 101 includes 1 LED lamp bead; when 2 and M are 10 for N, LED array 10 includes 2 LED lamp pearl groups 101, 2 LED lamp pearl groups 101 parallel connection, each LED lamp pearl group 101 includes 10 LED lamp pearls, 10 LED lamp pearls series connection.

The LED lamp beads are solid semiconductor materials capable of converting electric energy into visible light and can be roughly divided into three categories of a direct-insert type low-power type, an SMD (surface mounted device) patch type and a low-power type, and the voltage drop of the LED lamp beads is related to the categories of the LED lamp beads and the light emitting colors of the LED lamp beads. In this embodiment, the M LED lamp beads connected in series in the same LED lamp bead group 101 have the same specification, that is, the voltage drops of the M LED lamp beads connected in series in the same LED lamp bead group 101 are equal, assuming that the voltage drops of the LED11, the LED12 … …, the LED1(M-1), and the LED1M are Vi, the high-voltage direct current is V0, and the output driving voltage drop is Vin, Vin is V0-M Vi, and the output driving voltage drops of the other LED lamp bead groups 101 can be obtained in the same manner.

The driving circuit 20 includes a first end 201, a second end 202, and a third end 203, the first end 201 is connected to the corresponding LED lamp bead group 101, and the driving circuit 20 is configured to receive the driving voltage drop and output a constant current.

The driving voltage drop provides a power voltage for the driving circuit 20, so that the driving circuit 20 outputs a constant current, and the constant current acts on the LED lamp bead group 101 connected to the driving circuit 20 to drive the LED lamp bead group 101.

It can be understood that the number of the driving circuits 20 is greater than or equal to 1, that is, one driving circuit 20 may be connected to at least one of the LED lamp bead groups 101 to drive one or more of the LED lamp bead groups 101 connected thereto. When the driving circuit 20 is connected to one LED lamp bead group 101, the constant current output by the driving circuit 20 is used to drive the LED lamp bead group 101, and when the driving circuit 20 is connected to a plurality of LED lamp bead groups 101, the constant current output by the driving circuit 20 is averagely or dynamically distributed to the plurality of LED lamp bead groups 101 to drive the plurality of LED lamp bead groups 101.

In this embodiment, the number of the driving circuits 20 is N, and one LED lamp bead group 101 is connected to one driving circuit 20 and one current adjusting circuit 30. At this time, the current adjusting circuit 30 sets a constant current output by one of the driving circuits 20 connected thereto, the constant current output by the driving circuit 20 is used for driving one of the LED lamp bead groups 101 connected thereto, and the constant current flowing through the LED lamp bead group 101 is adjusted to control the brightness of the LED lamp bead group 101. That is, one of the current adjusting circuits 30 is used to adjust a constant current output by a corresponding one of the driving circuits 20, where the constant current is used to drive a corresponding one of the LED lamp bead groups 101, that is, in the LED driving circuit 100, the LED lamp bead groups 101, the driving circuits 20, and the current adjusting circuits 30 are equal in number and correspond to one another.

In the present embodiment, the driving circuit 20 includes a driving chip. The first end 201 is a positive electrode D of the driving chip, the second end 202 is a negative electrode GND of the driving chip, and the third end 203 is a current sampling end S of the driving chip.

Referring to fig. 4, the LED array 10 is a 6 × 15LED array, the LED array 10 includes 6 LED lamp bead groups 101, and each LED lamp bead group 101 includes 15LED lamp beads connected in series. The driving chip comprises a driving chip U1, a driving chip U2, a driving chip U3, a driving chip U4, a driving chip U5 and a driving chip U6. The driving chip U1 is used for driving the LED lamp bead group 101 composed of LED lamp beads LED11-LED115, the driving chip U2 is used for driving the LED lamp bead group 101 composed of LED lamp beads LED21-LED215, the driving chip U3 is used for driving the LED lamp bead group 101 composed of LED lamp beads LED31-LED315, the driving chip U4 is used for driving the LED lamp bead group 101 composed of LED lamp beads LED41-LED415, the driving chip U5 is used for driving the LED lamp bead group 101 composed of LED lamp beads LED51-LED515, and the driving chip U6 is used for driving the LED lamp bead group 101 composed of LED lamp beads LED61-LED 615.

In this embodiment, the driving chip adopts a single-channel LED constant-current driving control chip RM9003B, so that the LED driving circuit 1000 can directly step down the high-voltage direct current to the LED lamp bead without providing a step-down circuit. The single-channel LED constant current driving control chip RM9003B has simple peripheral circuits, can be applied to a circuit architecture in which a plurality of single-channel LED constant current driving control chips RM9003B are used in series or in parallel, and can set the output current of the single-channel LED constant current driving control chip RM9003B externally.

Specifically, the single-channel LED constant current driving control chip RM9003B is connected to the corresponding LED lamp bead group 101, so that the current flowing through the single-channel LED constant current driving control chip RM9003B is equal to the current flowing through the LED lamp bead group 101. The output current of the single-channel LED constant-current driving control chip RM9003B is set by the current regulating circuit 30, the chip anode D of the driving chip U1 is connected with the corresponding LED lamp bead group 101, and the output current is constant at a preset value. That is, the current adjusting circuit 30 can adjust the magnitude of the chip anode D output current of the driving chip U1, that is, the current adjusting circuit 30 can adjust the magnitude of the constant current driving the corresponding LED lamp bead group 101.

Further, the driving chip includes a current limiting module (not shown), where the current limiting module is configured to set the preset reference voltage, detect an input current of the current sampling terminal S, and adjust an output current of the anode D of the driving chip according to the input current.

When the working current flowing through the driving chip is larger than a preset constant voltage, the current limiting module detects the input current of the current sampling end S, namely the current flowing through the driving chip, and reduces the output current of the anode D of the driving chip, namely the constant current output by the driving chip; on the contrary, when the working current flowing through the driving chip is smaller than the preset constant voltage, the current limiting module detects the input current of the current sampling end S, increases the output current of the anode D of the driving chip, and makes the current of the LED driving circuit 100 present dynamic balance, so that the current flowing through the LED lamp bead group 101 is constant at the preset constant voltage.

The current adjusting circuits 30 correspond to the driving circuits 20 one to one, and each current adjusting circuit 30 is connected between the second end 202 and the third end 203 of the corresponding driving circuit 20, and is configured to adjust the constant current flowing through the LED lamp bead group 101 according to a preset reference voltage of the corresponding driving circuit 20 and an adjustment value of the current adjusting circuit 30.

It is understood that the number of the current adjusting circuits 30 is equal to that of the driving circuits 20, one driving circuit 20 is connected to one current adjusting circuit 30, and the current adjusting circuit 30 is used for setting the output current of the driving circuit 20. In this embodiment, the current adjusting circuit 30 includes a resistor, one end of the resistor is connected to the negative electrode GND of the driving chip, and the other end of the resistor is connected to the current sampling terminal S.

Referring to fig. 4, the current regulating circuit 30 includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, and a resistor R6. One end of the resistor R1 is connected with a negative pole GND of the driving chip U1, the other end of the resistor R1 is connected with a current sampling end S of the driving chip U1, and the resistor R1 is used for adjusting constant current flowing through the LED lamp bead group 101 consisting of the LED lamp beads LED11 and the LED 115; one end of the resistor R2 is connected with a negative pole GND of the driving chip U2, the other end of the resistor R2 is connected with a current sampling end S of the driving chip U2, and the resistor R2 is used for adjusting constant current flowing through the LED lamp bead group 101 consisting of the LED lamp beads LED21 and the LED 215; one end of the resistor R3 is connected with a negative pole GND of the driving chip U3, the other end of the resistor R3 is connected with a current sampling end S of the driving chip U3, and the resistor R3 is used for adjusting constant current flowing through the LED lamp bead group 101 consisting of the LED lamp beads LED31-LED 315; one end of the resistor R4 is connected with a negative pole GND of the driving chip U4, the other end of the resistor R4 is connected with a current sampling end S of the driving chip U4, and the resistor R4 is used for adjusting constant current flowing through the LED lamp bead group 101 consisting of the LED lamp beads LED41-LED 415; one end of the resistor R5 is connected with a negative pole GND of the driving chip U5, the other end of the resistor R5 is connected with a current sampling end S of the driving chip U5, and the resistor R5 is used for adjusting constant current flowing through the LED lamp bead group 101 consisting of the LED lamp beads LED51 and the LED 515; one end of the resistor R6 is connected with a negative pole GND of the driving chip U6, the other end of the resistor R6 is connected with a current sampling end S of the driving chip U6, and the resistor R6 is used for adjusting constant current flowing through the LED lamp bead group 101 formed by the LED lamp beads LED61-LED 615.

Taking the resistor R1 as an example, assuming that the preset reference voltage of the driving chip U1 is 0.6V and the resistance of the resistor R1 is 10 Ω, the constant current flowing through the LED11, the LED12 … …, the LED1(m-1) and the LED1m is 0.6V/10 Ω to 0.06A, in other words, if the preset reference voltage of the driving chip U1 is 0.6V, the constant current flowing through the LED11, the LED12 … …, the LED1(m-1) and the LED1m needs to be set to 0.06A, and the resistor R1 is replaced.

In this embodiment, the adjustment value of the current adjusting circuit 30 is the resistance value of the resistor of the current adjusting circuit 30. In some embodiments, the current regulating circuit 30 includes a sliding rheostat, a first end of the sliding rheostat is connected to the negative electrode GND of the driving chip, a second end of the sliding rheostat is connected to the current sampling end S, a third end (i.e., a sliding end) of the sliding rheostat is connected to the second end of the sliding rheostat, and the adjustment value is changed by adjusting a position of the third end of the sliding rheostat, so as to adjust the constant current output by the driving chip, and thus adjust the constant current flowing through the LED lamp bead group connected to the driving chip.

Assuming that the high-voltage direct current is 170V, specifications of all LED beads in the LED array 10 of 6 × 15 are consistent, a voltage drop of the LED beads is 9V, a luminous flux of the LED beads is 120LM/W, a preset reference voltage of each driving chip is 0.6V, and a resistance value of a resistor of each current adjusting circuit 30 is 10 Ω, then a driving voltage drop Vin of each LED bead group 101 is 170V- (15 × 9V) ═ 35V, which indicates that the voltage drop is maximum 35V at the voltage of the driving chip connected to the LED bead group 101. The current I1 flowing through each LED lamp bead group 101 is 0.6V/10 Ω is 0.06A, and the current I flowing through the LED array 10 is 6 0.06A is 0.36A. The power P of the LED array 10 is (15 × 9V) × 0.36A ═ 48.6W. The brightness F of the LED array 10 is 48.6W 120 LM/W5832 lumens. Therefore, according to the corresponding preset reference voltage of the driving circuit 20 and the adjustment value of the current adjusting circuit 30, the constant current flowing through the LED lamp bead group 101 can be adjusted to control the brightness of the array 10.

Please refer to fig. 2, which is a schematic structural diagram of an LED driving circuit according to another embodiment of the present invention. As shown in fig. 2, the LED driving circuit 200 includes the LED driving circuit 100 according to the above embodiments, and please refer to the above embodiments for the same parts, which are not described in detail herein. The difference is that the LED driving circuit 200 further includes a power module 40, and the power module 40 is connected to the LED array 10 and is configured to provide the high voltage direct current for the LED array 10.

Referring to fig. 3 and 4, the power module 40 includes a first protection circuit 401, a rectifying circuit 402, a filtering circuit 403, a second protection circuit 404, and a third protection circuit 405.

The first protection circuit 401 is used for connecting with the mains.

When the circuit fails, the rated power of the safety resistor RF1 is exceeded, that is, the current flowing through the safety resistor RF1 is too large, the temperature of the safety resistor RF1 rises within a short time, the resistive layer of the safety resistor RF1 is blown off by heat, and other components in the circuit are protected from being damaged.

In some embodiments, the fuse resistor RF1 may be replaced by a resistor and a fuse, the resistor is connected in series with the fuse, and the resistance and power of the resistor are consistent with the specification of the fuse resistor RF 1. The first protection circuit 401 can also be replaced by a fuse or a small bulb directly, and since the small bulb has a certain resistance value, when the current flowing through the small bulb is increased to a certain degree, the filament of the small bulb can emit light or be fused.

The rectifying circuit 402 is connected to the first protection circuit 401, and is configured to convert the commercial power into single-phase pulsating direct current.

The rectifier circuit 402 includes a rectifier bridge BR1, and the rectifier bridge BR1 is a full-bridge rectifier circuit and is used for converting the ac power with lower voltage output by the ac voltage drop circuit into single-phase pulsating dc power.

The filter circuit 403 is connected to the rectifier circuit 402, and is configured to filter the single-phase pulsating direct current and output a high-voltage direct current.

The filter circuit 403 includes a capacitor C1, the capacitor C1 is connected in parallel to the positive dc output terminal of the rectifier bridge BR1 and the negative dc output terminal of the rectifier bridge BR1, and since the single-phase pulsating dc is a mixture of a dc voltage and an ac voltage, after the filtering processing by the capacitor C1, the ac component of the single-phase pulsating dc is filtered out, and a smooth dc voltage waveform, that is, the high-voltage dc is output. Assuming that the voltage amplitude of the input alternating current is V1, the voltage amplitude of the high-voltage direct current is V0By virtue of the fact that the diodes in the rectifier bridge BR1 are capable of withstanding the maximum reverse voltage, it is possible to obtain,

for example, inputting 120V/60Hz AC power

The second protection circuit 404 is located between the first protection circuit 401 and the rectification circuit 402. The third protection circuit 405 is located between the rectification circuit 402 and the filter circuit 403.

The second protection circuit 404 includes a voltage dependent resistor RV1, one end of the voltage dependent resistor RV1 is connected to one end of the safety resistor RF1 and the positive ac input terminal of the rectifier bridge BR1, and the other end of the voltage dependent resistor RV1 is connected to the neutral line N and the negative ac input terminal of the rectifier bridge BR 1. The three-protection circuit 405 comprises a piezoresistor RV2, one end of the piezoresistor RV2 is connected with the positive direct-current output terminal of the rectifier bridge BR1 and the positive electrode of the capacitor C1, and the other end of the piezoresistor RV2 is connected with the negative direct-current output terminal of the rectifier bridge BR1, the negative electrode of the capacitor C1 and the analog ground.

It can be understood that the varistor RV1 and the varistor RV2 are both nonlinear resistor elements, taking the varistor RV1 as an example, the resistance of the varistor RV1 is respectively related to the magnitude of the voltage applied across the varistor RV1, when the voltage applied to the varistor RV1 is within the nominal value thereof, the resistance of the varistor RV1 presents an infinite state, almost no current flows through the varistor, when the voltage applied to the varistor RV1 is slightly greater than the nominal voltage, the varistor RV1 breaks down rapidly, and the resistance thereof drops rapidly, so that the varistor RV1 is in a conducting state, thereby implementing overvoltage protection of the circuit and protecting other components in the circuit from damage. In some embodiments, at least one of the second protection circuit 404 and the third protection circuit 405 may be omitted.

The embodiment of the utility model provides a LED drive circuit, through current regulation circuit, with the drive circuit one-to-one to according to the preset reference voltage of the drive circuit who corresponds and current regulation circuit's adjustment value, adjust the constant current who flows through LED lamp pearl group, consequently, the embodiment of the utility model provides a can adjust constant current's size, promoted drive circuit's adaptability simultaneously.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments can be combined, steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (10)

1. An LED driving circuit, comprising:

the LED array comprises N LED lamp bead groups connected in parallel, each LED lamp bead group comprises M LED lamp beads connected in series, each LED lamp bead group is used for receiving high-voltage direct current and outputting driving voltage drop, wherein N is more than or equal to 1, and M is more than or equal to 1;

the driving circuit comprises a first end, a second end and a third end, the first end is connected with the corresponding LED lamp bead group, and the driving circuit is used for receiving the driving voltage drop and outputting constant current; and

and the current regulating circuits are in one-to-one correspondence with the driving circuits, and each current regulating circuit is connected between the second end and the third end of the corresponding driving circuit and is used for regulating the constant current flowing through the LED lamp bead group according to the corresponding preset reference voltage of the driving circuit and the regulating value of the current regulating circuit.

2. The LED driving circuit according to claim 1, wherein the number of the driving circuits is N, and one LED lamp bead group is connected with one driving circuit and one current regulating circuit.

3. The LED driving circuit according to claim 1, wherein the driving circuit comprises a driving chip.

4. The LED driving circuit according to claim 3, wherein the first terminal is an anode of the driving chip, the second terminal is a cathode of the driving chip, and the third terminal is a current sampling terminal of the driving chip.

5. The LED driving circuit according to claim 4, wherein the driving chip comprises a current limiting module, and the current limiting module is configured to set the preset reference voltage, detect an input current of the current sampling terminal, and adjust an output current of the anode of the driving chip according to the input current.

6. The LED driving circuit according to claim 4, wherein the current regulating circuit comprises a resistor, one end of the resistor is connected to the negative electrode of the driving chip, and the other end of the resistor is connected to the current sampling terminal.

7. The LED driving circuit according to any of claims 1-6, further comprising a power module connected to the LED array for providing the high voltage direct current to the LED array.

8. The LED driving circuit according to claim 7, wherein the power supply module comprises:

the first protection circuit is used for being connected with commercial power;

the rectifying circuit is connected with the first protection circuit and used for converting the commercial power into single-phase pulsating direct current;

and the filter circuit is connected with the rectifying circuit and used for filtering the single-phase pulsating direct current and outputting the high-voltage direct current.

9. The LED driving circuit of claim 8, wherein the power module further comprises:

a second protection circuit located between the first protection circuit and the rectification circuit;

a third protection circuit between the rectification circuit and the filter circuit.

10. A lighting device characterized by comprising the LED driving circuit according to any one of claims 1 to 9.

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