CN112996192A

CN112996192A - LED drive circuit

Info

Publication number: CN112996192A
Application number: CN202110205847.3A
Authority: CN
Inventors: 马瑞芳
Original assignee: Shanghai Musa Electronic Technology Co ltd
Current assignee: Shanghai Musa Electronic Technology Co ltd
Priority date: 2021-02-24
Filing date: 2021-02-24
Publication date: 2021-06-18

Abstract

The application relates to the technical field of LED drive, especially, relate to an LED drive circuit, aim at solving the poor technical problem of prior art LED drive circuit adaptation operational environment, its technical scheme is: the LED load circuit comprises a main circuit and a control module, wherein the main circuit is used for supplying power to the LED load circuit, and the control module is used for detecting the main circuit and detecting the external environment of the main circuit; the control module includes circuit detection module and the light detection module who detects control processing to the main circuit, the light detection module is used for detecting external environment, the light detection module includes detecting element and switching unit, detecting element connects in parallel and sets up the output at the main circuit, and this application has the ability that improves LED load adaptation operational environment, has extension LED drive circuit life's technological effect simultaneously.

Description

LED drive circuit

Technical Field

The application relates to the technical field of LED driving, in particular to an LED driving circuit.

Background

As a novel lighting device, the LED lamp is widely used in the field of lighting due to its high luminous efficiency; the LED driver is a power supply adjusting electronic device for driving an LED to emit light or an LED module assembly to normally work.

The related LED driving circuit comprises a main circuit and a control circuit, the control circuit is used for detecting voltage and current of the main circuit of the LED, then the control circuit compares detection signals of the voltage and the current, the processed voltage and current signals are transmitted to the controller, and the controller is used for adjusting the voltage and the current of the main circuit, so that the voltage and the current in the main circuit are in a stable working state, and further the LED load circuit is in a stable state to work.

With respect to the related art in the above, the inventors consider that there are drawbacks: the related control circuit detects and controls the main circuit to enable the LED load to be in a stable working state, but the related LED driver (namely the LED drive circuit) is influenced by external environment factors, so that the LED driver does not have the capability of a switching circuit, and the related LED drive circuit is influenced by the external environment factors to enable the LED drive circuit to work in a load state. The service life of the LED driving circuit is influenced, so that a novel LED driving circuit is urgently needed to adapt to various working environments.

Disclosure of Invention

In order to enable the LED driving circuit to adapt to different working environments and prolong the service life of the LED driving circuit, the application provides the LED driving circuit.

The application provides an LED drive circuit adopts following technical scheme:

an LED drive circuit comprises a main circuit and a control module, wherein the main circuit is used for supplying power to an LED load circuit, and the control module is used for detecting the main circuit and detecting the external environment of the main circuit;

the control module comprises a circuit detection module for detecting and controlling the main circuit and a light detection module, and the light detection module is used for detecting the external environment;

the light detection module comprises a photosensitive switch element and a photosensitive detection element, wherein the photosensitive switch element is arranged in the main circuit in series, and the photosensitive detection element is used for detecting and processing an external light source.

By adopting the technical scheme, utilize control module to detect the processing to the main circuit, control module includes circuit detection module and light detection module, circuit detection module detects voltage and electric current in the main circuit, and under the unusual state of voltage current appearance, make the main circuit disconnection, and then reach the effect to main circuit and control module protection, establish ties photosensitive switch spare and set up in the main circuit, photosensitive detection spare is after detecting external environment change, photosensitive switch spare's on-off state receives photosensitive detection spare influence, make photosensitive switch spare control main circuit control the break-make of LED load circuit, make LED load circuit adapt to different operational environment.

Optionally, the circuit detection module includes a voltage module for detecting a main circuit voltage, and a current module for detecting a main circuit current;

the voltage module comprises a voltage detector, a voltage comparator and a voltage controller, the voltage detector is arranged at the input end of the main circuit in parallel, the output end of the voltage detector is connected with the inverted input end of the voltage comparator, and the output end of the voltage controller is connected with the voltage controller.

By adopting the technical scheme, after the detection voltage of the inverting input end of the voltage comparator is compared with the voltage reference value and the difference value is large, the output end of the voltage comparator outputs a high-level signal and transmits the high-level signal to the voltage controller, the voltage controller enables electricity of KM1 to enable the voltage normally-closed switch to be disconnected, and then the main circuit is disconnected, so that the main circuit does not work, and the protection effect on the circuit is achieved. Otherwise, the difference value of the voltage comparator is smaller, the voltage comparator outputs a low level signal, the voltage normally-closed switch does not act, and the main circuit keeps working normally.

Optionally, the current module includes a current detector, a current comparator and a current controller, the current detector is connected in parallel to the input end of the main circuit, the output end of the current detector is connected to the inverting input end of the current comparator, and the output end of the current controller is connected to the current controller.

Through adopting above-mentioned technical scheme, utilize the current comparator to carry out the comparison to the signal of current detector and current reference value, after the difference of current comparator is great, the current comparator output is high flat signal to give current controller with high level signal transfer, current controller makes KM 1's electricity, makes the disconnection of current normally closed switch, and then the main circuit disconnection, makes the main circuit inoperative, reaches the protection effect to the circuit. Otherwise, the difference value of the current comparator is smaller, the current comparator outputs a low level signal, the current normally-closed switch does not act, and the main circuit keeps working normally.

Optionally, the circuit detection module further includes a switching module, where the switching module includes a voltage switching module corresponding to the voltage controller and a current switching module corresponding to the current controller;

the voltage switching module is arranged at the input end of the main circuit in series, and the current switching module is arranged in the main circuit in series;

when the high-level signal is output by the voltage comparator, the voltage switching module is used for cutting off the power supply of the main circuit,

and when the high-level signal is output by the current comparator, the current switching module is used for disconnecting the working circuit of the main circuit.

By adopting the technical scheme, the arrangement of the switching module is utilized, when the voltage and the current in the main circuit fluctuate abnormally, the short circuit control of the voltage switching module and the current switching module is utilized, so that the main circuit is in different working states, and the effect of protecting the main circuit and the LED load circuit is achieved.

Optionally, the circuit detection module further includes a temperature detection assembly, and the temperature detection assembly is configured to detect an external temperature of the circuit board of the LED load circuit;

the temperature detection assembly comprises a temperature detector, a temperature controller and a temperature switching module, the temperature switching module is connected to the input end of the LED load circuit in series, the temperature detector is used for detecting external signals and transmitting detection electric signals to the temperature controller, and the temperature controller is used for connecting the electric signals of the rear temperature detector and controlling the action of the temperature switching module.

By adopting the technical scheme, the external temperature of the main circuit is detected by utilizing the arrangement of the temperature detection assembly, and meanwhile, the working state of the main circuit is switched by utilizing the temperature switching module, so that the protection effect on the main circuit is achieved.

Optionally, a standby circuit is arranged on one side of the main circuit, the temperature switching module comprises a temperature normally-open module and a temperature normally-closed module, the temperature normally-open module is connected in series to be arranged at the input end of the standby circuit, and the temperature normally-closed module is connected in series to be arranged at the input end of the LED load.

By adopting the technical scheme, the standby circuit and the main circuit are switched, and after the temperature detected by the temperature detector is overhigh, the standby circuit and the main circuit are switched to work by adopting the temperature switching module, so that the protection effect on the main circuit is achieved.

Optionally, the photosensitive switching element includes an indication circuit, a comparison circuit, and a photosensitive circuit;

the indicating circuit comprises a light emitting diode D1 and a first resistor R1, wherein one end of the first resistor R1 is connected with the cathode of the light emitting diode D1 in series, the other end of the first resistor R1 is grounded, and the anode of the light emitting diode D1 is connected with a power supply;

the photosensitive circuit comprises a photosensitive resistor R10 and a second resistor R2 connected with the photosensitive circuit in series, wherein one end of the second resistor R2, which is far away from the photosensitive resistor R10, is connected with a power supply, and the other end of the photosensitive resistor R10 is grounded;

the comparison circuit comprises a comparator W3 and a sampling resistor RW1, the sampling resistor RW1 is connected with the negative electrode of the comparator W3, one end of the photoresistor R10, which is connected with the second resistor R2 in series, is connected with the positive electrode of the comparator W3, the output end of the comparator W3 is connected with an output resistor R5, and the output resistor R5 is connected with a power supply.

Through adopting above-mentioned technical scheme, utilize the change of photosensitive circuit to the production of light, and then make comparator W output different high-low levels, utilize high-low level to represent different daytime and night respectively for the main circuit is out of work daytime, and is in operating condition when light is lower night, reaches the effect that adapts to different operational environment with this.

Optionally, a second capacitor C2 is connected in parallel to one side of the photoresistor R10, and one end of the second capacitor C2 is grounded, and the other end is connected to the positive electrode of the comparator W3.

Through adopting above-mentioned technical scheme, utilize the setting of second electric capacity to protect the photo resistance, the anodal exportable analog signal of second electric capacity detects the processing simultaneously.

Optionally, the main circuit includes a rectifying circuit and a filter circuit, the rectifying circuit includes a rectifying bridge, and the filter circuit includes a first inductor L1, a third capacitor C3, and a filter capacitor C4.

By adopting the technical scheme, the rectification and filtering processing is carried out by utilizing the rectification circuit and the filter circuit, so that the main circuit outputs stable voltage, and the influence of the fluctuation of voltage and current on the LED load circuit is reduced.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the control module is used for detecting the main circuit, the control module is used for detecting the working state of the voltage and current of the main circuit, the main circuit is disconnected under the condition that the voltage and current of the main circuit fluctuate abnormally, the effect of protecting the main circuit and the control module is achieved, meanwhile, the photosensitive switch element and the photosensitive detection element are used for detecting the external environment, the main circuit is in an out-of-operation state under the daytime condition, meanwhile, the circuit works normally at night, and the LED load circuit is made to adapt to different working environments;

2. the temperature detection assembly is arranged, the external temperature of the main circuit is detected, and meanwhile, the working state of the main circuit is switched by the temperature switching module, so that the protection effect on the main circuit is achieved.

Drawings

FIG. 1 is a schematic view of the overall structure of embodiment 1 of the present application;

fig. 2 is a schematic view of the overall structure of a light detection module according to embodiment 1 of the present application;

FIG. 3 is a schematic view of the entire structure of embodiment 1 of the present application for embodying a photosensitive detection element;

fig. 4 is a schematic diagram of the overall structure of a circuit detection module according to embodiment 1 of the present application;

fig. 5 is a schematic view of an overall structure of a voltage module and a current module according to embodiment 1 of the present application;

FIG. 6 is a schematic view of the entire structure of a temperature detection unit according to embodiment 1 of the present application;

fig. 7 is a schematic view of the overall structure of embodiment 2 of the present application.

Description of reference numerals: 1. a main circuit; 2. a control module; 3. a circuit detection module; 4. a light detection module; 5. a detection unit; 7. a voltage module; 71. a voltage detector; 72. a voltage comparator; 73. a voltage controller; 8. a current module; 81. a current detector; 82. a current comparator; 83. a current controller; 9. a switching module; 91. a voltage switching module; 911. a voltage normally-closed switch; 92. a current switching module; 921. a voltage normally-closed switch; 10. a standby circuit; 11. a normally closed member; 12. a normally open member; 17. a temperature detection assembly; 19. a photosensitive switching element; 20. a photosensitive detection member; 23. an indication circuit; 24. a comparison circuit; 25. a light sensitive circuit; 30. an LED load circuit; 36. a rectifying circuit; 37. a filter circuit; 40. a photosensitive controller; 41. a temperature detector; 42. a temperature controller; 44. a temperature normally open module; 45. a temperature normally closed module.

Detailed Description

The present application is described in further detail below with reference to figures 1-7.

The embodiment of the application discloses an LED drive circuit

Example 1

Referring to fig. 1, the LED driving circuit includes a main circuit 1 and a control module 2, an input end of the main circuit 1 is connected to an ac power supply, the main circuit 1 performs rectification and filtering processing on the ac power supply, so that the main circuit 1 outputs a relatively flat voltage and current, an output end of the main circuit 1 and an LED load circuit 30, and the main circuit 1 is used to perform power supply processing on the LED load circuit 30. The control module 2 comprises a light detection module 4 for detecting the external environment of the main circuit 1 and a circuit detection module 3 for detecting the circuit condition of the main circuit 1. The circuit detection module 3 detects and processes the voltage and current in the main circuit 1, transmits the detected voltage and current to the control end, and controls the on-off of the main circuit 1 by using the control end, thereby achieving the protection effect on the LED drive circuit. The light detection module 4 is used for detecting and processing external light of the LED load circuit 30, and the on-off of the LED load circuit is controlled through detected light signals, so that the LED load circuit 30 is suitable for different working environments.

Referring to fig. 2, the light detection module 4 includes a photosensitive switch piece 19, a photosensitive detection piece 20 and a photosensitive controller 40, the photosensitive switch piece 19 includes a normally closed piece 11 and a normally open piece 12, the normally open piece 12 is connected in series with the LED load circuit 30, the normally open piece 12 is set as the normally open switch of the relay KM, and after the coil of the relay is powered, the normally open switch of the relay KM is closed. After the photosensitive detecting element 20 detects the change of light, the photosensitive detecting element 20 transmits a signal to the photosensitive controller 40, and the photosensitive controller 40 outputs the signal to the relay circuit. The working state of the LED load circuit 30 is controlled by utilizing the on-off of the relay KM, so that the long-time working state of the LED load circuit 30 is reduced, the loss of components of the LED load circuit 30 is reduced, and the protection effect of the LED load circuit 30 is further achieved.

Referring to fig. 2 and 3, the photosensitive detecting member 20 includes an indicating circuit 23, a photosensitive circuit 25, a contrast circuit 24:

the indicating circuit 23 comprises a light emitting diode D1, a first resistor R1 and a first capacitor C1, wherein the cathode of the light emitting diode D1 is connected with the first resistor R1, the first resistor R1 is connected with the light emitting diode D1 in series, the first capacitor C1 is connected with the light emitting diode D1 and the first resistor R1 in parallel, the anode of the light emitting diode D1 is connected with a power supply, and after the power supply is switched on, the light emitting diode D1 emits a bright light to indicate that the indicating circuit 23 is in an operating state.

The photosensitive circuit 25 comprises a photosensitive resistor R10 and a second resistor R2, the photosensitive resistor R10 is connected with the second resistor R2 in series, the photosensitive resistor R10 is connected with a power supply, and the second resistor R2 is grounded.

The comparison circuit 24 comprises a comparator W3 and a sampling resistor RW1, the sampling resistor RW1 is set as an adjustable resistor, an adjustable end of the sampling resistor RW1 is connected with an inverted input end of the comparator W3, a position where a photoresistor R10 and a second resistor R2 are connected in series is connected with a non-inverted input end of the comparator W3, an output end of the comparator W3 is connected with an output resistor R5, and a power supply is connected to the output resistor R5.

When the photoresistor R10 is in no light or weak illumination intensity, the resistance of the photoresistor R10 is increased, the voltage value obtained on the photoresistor R10 is increased because the photoresistor R10 is connected in series with the second resistor R2, the voltage of the photoresistor R10 is close to the power supply voltage, and meanwhile, the voltage of the positive phase input end of the comparator W3 is larger than that of the negative phase input end because the sampling voltage of the sampling resistor RW1 is set to be half of the power supply voltage.

The output of the comparator W3 therefore outputs a high level signal to the photosensitive controller 40, the high level signal representing a low light signal, i.e., a signal at night or with poor light.

The photosensitive controller 40 outputs a high-level signal to the relay KM, the relay KM is electrified and attracted, so that a normally open switch of the normally open part 12 is closed, and finally the LED load circuit 30 is connected to the main circuit 1, so that the LED load circuit 30 works normally.

When the photoresistor R10 is strong in light or illumination intensity, the resistance of the photoresistor R10 is increased, and the resistance of the photoresistor R10 is rapidly reduced, so that the voltage value obtained on the photoresistor R10 is small, the voltage of the photoresistor R10 is close to zero, and meanwhile, the sampling voltage of the sampling resistor RW1 is set to be half of the power voltage, so that the voltage of the positive electrode of the comparator W3 is smaller than the voltage of the negative electrode.

The output of the comparator W3 therefore outputs a low level signal to the photosensitive controller 40, which is representative of a strong light signal, i.e., a daytime or high light signal.

The photosensitive controller 40 outputs a low-level signal to the relay circuit, the relay KM in the relay circuit is not powered on, the normally open switch of the normally open part 12 does not work, so that the LED load circuit 30 does not work, or the relay KM is powered off, so that the LED load circuit 30 stops working.

The photoresistor R10 is connected in parallel with a second capacitor C2, one end of the second capacitor C2 is grounded, and the other end of the second capacitor C2 is connected with the anode of the comparator W3, and by means of the arrangement of the second capacitor C2, an analog signal can be led out from the end of the capacitor C, and the analog signal is used for detection processing.

Referring to fig. 4, the main circuit 1 includes a rectifying circuit 36 and a filter circuit 37, the rectifying circuit 36 includes a rectifying bridge, and the rectifying bridge is used to rectify the power supply to output a relatively smooth voltage waveform, and meanwhile, the filter circuit 37 is used to filter the rectified ac power, so that the output voltage and the current tend to be stable, the influence of the fluctuation of the power supply on the LED load circuit 30 is reduced, and the service life of the LED is further prolonged. The filter circuit 37 comprises a first inductor L1, a third capacitor C3 and a filter capacitor C4, and the LC filter circuit 37 adopts pi-type LC filtering, so that the filter circuit has the advantages of high output voltage and stable current.

Referring to fig. 4 and 5, the circuit detection module 3 includes a voltage module 7 and a current module 8, and the voltage module 7 detects the voltage of the main circuit 1. The current module 8 detects the current of the main circuit 1. The circuit detection module 3 further includes a switching module 9, the switching module 9 includes a voltage switching module 91 and a current switching module 92, the voltage switching module 91 and the current switching module 92 are both connected in series in the main circuit 1, the voltage switching module 91 includes a voltage normally closed switch 911 and a relay circuit for controlling the voltage normally closed switch 911 to operate, and the current switching module 92 includes a current normally closed switch 921 and a relay circuit for controlling the current normally closed switch 921 to operate.

Referring to fig. 4 and 5, the voltage module 7 includes a voltage detector 71, a voltage comparator 72 and a voltage controller 73, the voltage detector 71 is disposed in the main circuit 1 in parallel, the voltage detector 71 detects the input voltage of the main circuit 1, and transmits the detection result of the voltage detector 71 to the voltage comparator 72, after the comparison by the voltage comparator 72, the voltage comparator 72 outputs a signal to a relay circuit, a relay KM1 is disposed in the relay circuit, and the relay KM1 controls the on/off of the main circuit 1. The specific working principle of the relay KM1 is as follows:

after the detection voltage at the inverting input end of the voltage comparator 72 is compared with the voltage reference value and the difference value is large, the output end of the voltage comparator 72 outputs a high-level signal and transmits the high-level signal to the voltage controller 73, the voltage controller 73 enables the relay KM1 to be electrified, the voltage normally-closed switch 911 is disconnected, the main circuit 1 does not work, and the protection effect on the main circuit 1 is achieved.

On the contrary, the difference between the positive phase input terminal and the negative phase input terminal of the voltage comparator 72 is small, the voltage comparator 72 outputs a low level signal, the normally closed voltage switch 911 does not operate, and the main circuit 1 maintains normal operation.

Referring to fig. 4 and 5, the current module 8 includes a current detector 81, a current comparator 82 and a current controller 83, the current detector 81 is serially connected in the main circuit 1, the current detector 81 is used for detecting the current of the main circuit 1, and a current signal of the current detector 81 is transmitted to the current comparator 82, the current comparator 82 outputs a high-level signal to the relay circuit, and after a coil KM2 in the relay circuit is powered, the normally closed switch of KM2 is used for controlling the on-off of the main circuit 1 by the current comparator 82. The specific KM2 working principle is as follows:

after the detection current of the inverting input end of the current comparator 82 is compared with the current reference value and the difference value is large, the output end of the current comparator 82 outputs a high-level signal and transmits the high-level signal to the current controller 83, the current controller 83 enables the relay KM2 to be powered on, the current normally-closed switch 921 is enabled to be disconnected, the main circuit 1 is further disconnected, the main circuit 1 does not work, and the protection effect on the main circuit 1 is achieved.

On the contrary, the difference between the positive phase input terminal and the negative phase input terminal of the current comparator 82 is small, the current comparator 82 outputs a low level signal, the current normally-closed switch 921 does not operate, and the main circuit 1 maintains normal operation.

Referring to fig. 6, the circuit detecting module 3 further includes a temperature detecting assembly 17 for detecting the temperature outside the LED load circuit 30, and the temperature detecting assembly 17 includes a temperature detector 41, a temperature controller 42, and a temperature switching module, and the temperature switching module is serially connected to the input end of the LED load circuit 30.

One side of main circuit 1 is provided with stand-by circuit 10, and the temperature switches the module and includes that the temperature normally opens module 44 and temperature normally closed module 45, and the temperature normally opens module 44 series connection and sets up the input at stand-by circuit 10, and temperature normally closed module 45 series connection sets up the input at LED load circuit 30. The temperature detector 41 is used for detecting the external temperature, the detected electric signal is transmitted to the temperature controller 42, and then the temperature controller 42 is used for disconnecting the temperature normally-closed module 45 of the temperature switching module, so that the LED load circuit 30 is disconnected, and the protection effect on the LED load circuit 30 is achieved. Meanwhile, the temperature normally-open module 44 is closed, and the standby circuit 10 is connected into the circuit, so that the standby circuit 10 and the main circuit 1 are switched to be used, and the protection effect on the main circuit 1 is achieved.

Example 2

The present embodiment 2 differs from embodiment 1 in that:

referring to fig. 7, the normally open component 12 is serially connected to the input end of the main circuit 1, and after the photosensitive detection component 17 detects that the external light is weak, the normally open component 12 serially connected to the relay KM in the main circuit 1 is closed, so that the main circuit 1 is powered on to open the LED load circuit 30, and meanwhile, the temperature detection component 17 starts to work. When the temperature detector 41 detects that the temperature changes greatly, the detected electric signal is transmitted to the temperature controller 42, the temperature controller 42 outputs a rectangular signal with a long period, namely a long high-level signal and a long low-level signal, and during the period that the relay circuit receives the high-level signal, the relay KM3 enables the main circuit 1 to be switched on, and the main circuit 1 is used for supplying power to the LED load circuit 30.

Meanwhile, the normally closed element 11 of the relay circuit is arranged in series in the standby circuit 10, and when the normally open switch of the relay KM3 is closed, the normally closed switch of KM3 is in an open state, so that the standby circuit 10 is in an open circuit.

When the relay circuit receives the low level signal, the relay KM3 loses power, so that the main circuit 11 is disconnected, and the normally closed switch in the standby circuit 10 is reset, so that the standby circuit 10 supplies power to the LED load circuit 30.

The implementation principle of the LED drive circuit in the embodiment of the application is as follows: the control module 2 is used for detecting the main circuit 1, detecting the working state of the voltage and the current of the main circuit 1, and disconnecting the main circuit 1 under the condition that the voltage and the current of the main circuit 1 have abnormal fluctuation, thereby achieving the effect of protecting the main circuit 1 and the control module 2. The temperature detecting assembly 17 is used for detecting the external temperature, when the external temperature of the main circuit 1 changes greatly, the main circuit 1 and the standby circuit 10 are switched to use through the temperature switching module, and the effects of protecting the main circuit 1 and adapting to the environment are achieved. Meanwhile, the external environment is detected and processed by the photosensitive switch element 19 and the photosensitive detection element 20, so that the main circuit 1 is in an inoperative state in the daytime, and the main circuit 1 normally operates at night, and further the LED load circuit 30 is adapted to different working environments.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. An LED drive circuit, characterized by: the LED load circuit comprises a main circuit (1), the main circuit (1) and a control module (2), wherein the main circuit (1) is used for supplying power to an LED load circuit (30), and the control module (2) is used for detecting the main circuit (1) and detecting the external environment of the main circuit (1);

the control module (2) comprises a circuit detection module (3) and a light detection module (4) which are used for detecting, controlling and processing the main circuit (1), and the light detection module (4) is used for detecting an external environment;

the light detection module (4) comprises a photosensitive switch element (19) and a photosensitive detection element (20), wherein the photosensitive switch element and the photosensitive detection element are serially connected in the main circuit (1), and the photosensitive detection element is used for detecting and processing an external light source.

2. An LED driving circuit according to claim 1, wherein: the circuit detection module (3) comprises a voltage module (7) for detecting the voltage of the main circuit (1) and a current module (8) for detecting the current of the main circuit (1);

the voltage module (7) comprises a voltage detector (71), a voltage comparator (72) and a voltage controller (73), wherein the voltage detector (71) is connected to the input end of the main circuit (1) in parallel, the output end of the voltage detector (71) is connected with the inverted input end of the voltage comparator (72), and the output end of the voltage controller (73) is connected with the voltage controller (73).

3. An LED driving circuit according to claim 2, wherein: the current module (8) comprises a current detector (81), a current comparator (82) and a current controller (83), wherein the current detector (81) is connected to the input end of the main circuit (1) in parallel, the output end of the current detector (81) is connected with the inverting input end of the current comparator (82), and the output end of the current controller (83) is connected with the current controller (83).

4. An LED driving circuit according to claim 3, wherein: the circuit detection module (3) further comprises a switching module (9), and the switching module (9) comprises a voltage switching module (91) arranged corresponding to the voltage controller (73) and a current switching module (92) arranged corresponding to the current controller (83);

the voltage switching module (91) is arranged at the input end of the main circuit (1) in series, and the current switching module (92) is arranged in the main circuit (1) in series;

when the high-level signal is output by the voltage comparator (72), the voltage switching module (91) is used for cutting off the power supply of the main circuit (1),

when the high-level signal is output by the current comparator (82), the current switching module (92) is used for disconnecting the working loop of the main circuit (1).

5. An LED driving circuit according to claim 1, wherein: the circuit detection module (3) further comprises a temperature detection component (17), and the temperature detection component (17) is used for detecting the external temperature of the circuit board of the LED load circuit (30);

the temperature detection assembly (17) comprises a temperature detector (41), a temperature controller (42) and a temperature switching module, the temperature switching module is serially arranged at the input end of the LED load circuit (30), the temperature detector (41) is used for detecting external signals and transmitting detection electric signals to the temperature controller (42), and the temperature controller (42) is used for connecting electric signals of the temperature detector (41) and controlling the action of the temperature switching module.

6. An LED driving circuit according to claim 5, wherein: one side of main circuit (1) is provided with stand-by circuit (10), the temperature switches the module and includes that the temperature normally opens module (44) and temperature normally closed module (45), the temperature normally opens module (44) and establishes ties and set up the input at stand-by circuit (10), temperature normally closed module (45) establish ties and sets up the input at LED load circuit.

7. An LED driving circuit according to claim 1, wherein: the photosensitive switch piece (19) comprises an indicating circuit (23), a comparison circuit (24) and a photosensitive circuit (25);

the indicating circuit (23) comprises a light emitting diode D1 and a first resistor R1, one end of the first resistor R1 is connected with the cathode of the light emitting diode D1 in series, the other end of the first resistor R1 is grounded, and the anode of the light emitting diode D1 is connected with a power supply;

the photosensitive circuit (25) comprises a photosensitive resistor R10 and a second resistor R2 connected with the photosensitive circuit (25) in series, one end of the second resistor R2 far away from the photosensitive resistor R10 is connected with a power supply, and the other end of the photosensitive resistor R10 is grounded;

the comparison circuit (24) comprises a comparator W3 and a sampling resistor RW1, the sampling resistor RW1 is connected with the negative electrode of the comparator W3, one end of the photoresistor R10, which is connected with the second resistor R2 in series, is connected with the positive electrode of the comparator W3, the output end of the comparator W3 is connected with an output resistor R5, and the output resistor R5 is connected with a power supply.

8. An LED driving circuit according to claim 7, wherein: one side of the photoresistor R10 is connected in parallel with a second capacitor C2, and one end of the second capacitor C2 is grounded, and the other end is connected with the anode of a comparator W3.

9. An LED driving circuit according to claim 8, wherein: the main circuit (1) comprises a rectifying circuit (36) and a filter circuit (37), wherein the rectifying circuit (36) comprises a rectifying bridge, and the filter circuit (37) comprises a first inductor L1, a third capacitor C3 and a filter capacitor C4.