A control circuit of LED and its monitoring camera and monitoring system

Abstract

The present invention is applicable to the field of circuits, and provides a control circuit of an LED and a monitoring camera and a monitoring system thereof, wherein the control circuit comprises: a photosensitive module, an integrated control module, an LED light group, and a hysteresis protection module, wherein the photosensitive module senses the external light intensity, and the integrated control module controls the on and off of the LED light group according to the light intensity, and a hysteresis protection module is provided to prevent the LED light group from flickering when the external light intensity is unstable, thereby extending the service life of the equipment. The integrated control circuit of the present invention integrates discrete devices into the integrated control module, and the circuit is simple and flexible, the cost of peripheral devices is low, and the reliability of the whole machine is high. The hysteresis function of the circuit is realized by the hysteresis protection module, thereby preventing the LED light from flickering and extending the service life of the LED light.

Description

Technical Field

[0001] The invention belongs to the field of circuits, and in particular relates to a control circuit of an LED and a monitoring camera and a monitoring system thereof. Background Art

[0002] With the increasing awareness of anti-theft, security surveillance cameras are used more and more. Many security cameras are equipped with LED lights to illuminate the monitoring range.

[0003] The LED lighting of existing security surveillance cameras is implemented by discrete devices. The circuit requires multiple discrete components to be connected to each other. The large number of components leads to a large PCB area and a large number of solder joints on the PCB, which increases the processing defect rate of the PCB and increases the production cost. In addition, due to the large number of discrete devices, the control circuit function of the LED lamp is generally relatively simple. The function of the LED lamp control circuit is only to control the on and off of the LED lamp. The safety and stability of the LED lamp are not considered, resulting in a short service life of the LED lamp and increased monitoring costs.

[0004] It can be seen that the existing LED lighting control of security surveillance cameras has a complex circuit structure, high production cost, and a single circuit structure. It is impossible to estimate the safety and stability of the use of LED lights, resulting in a short service life of LEDs and increased monitoring costs. Summary of the invention

[0005] The purpose of the embodiments of the present invention is to provide a control circuit for an LED, aiming to solve the technical problems in the existing LED lighting control of security monitoring cameras, such as complex circuit structure, high production cost, single circuit structure, inability to estimate the safety and stability of the use of LED lights, resulting in short service life of LEDs and increased monitoring costs.

[0006] The embodiment of the present invention is implemented as follows: a control circuit of an LED, characterized in that the control circuit of the LED comprises:

[0007] A light intensity sensing module, used to sense the external light intensity and output a light intensity sensing signal according to the light intensity;

[0008] An integrated control module, connected to the light intensity sensing module, for outputting an LED control signal according to the light intensity sensing signal;

[0009] An LED lamp group, comprising at least one LED lamp, connected to the integrated control module, and configured to be turned on and off under the control of the LED control signal; and

[0010] A hysteresis protection module is connected to the light intensity sensing module. When the change of the light intensity sensing signal is sufficient to change the light emitting state of the LED light group controlled by the LED control signal, the conduction state of the hysteresis protection module changes to delay the change of the light intensity sensing signal.

[0011] Another object of an embodiment of the present invention is to provide a security monitoring camera, comprising:

[0012] An LED lighting lamp, wherein the LED lighting lamp is controlled by the LED control circuit described in the above embodiment; and

[0013] The camera is used to monitor and record the area illuminated by the LED lighting lamp.

[0014] Another object of an embodiment of the present invention is to provide a security monitoring system, comprising:

[0015] At least one security surveillance camera as described in the above embodiment, used for monitoring and recording; and

[0016] The storage medium is used to receive and store the surveillance video generated by the security surveillance camera.

[0017] In the LED control circuit and its monitoring camera and monitoring system provided by the embodiments of the present invention, the integrated control circuit integrates discrete devices into the integrated control module, the circuit is simple and flexible, the cost of peripheral devices is low, and the reliability of the whole machine is high. The hysteresis function of the circuit is realized through the hysteresis protection module to avoid flickering of the LED lamp, extend the service life of the LED lamp, and reduce the monitoring cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A block diagram of the LED control circuit provided by an embodiment of the present invention;

[0019] Figure 2 A control circuit diagram of an LED provided by an embodiment of the present invention;

[0020] Figure 3 A circuit diagram of an integrated control module provided by an embodiment of the present invention;

[0021] Figure 4 Another control circuit diagram provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0023] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but unless otherwise specified, these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, a first pin may be referred to as a second pin, and similarly, a second pin may be referred to as a first pin without departing from the scope of this application.

[0024] Figure 1 The principle block diagram of the LED control circuit provided by the embodiment of the present invention is described in detail as follows.

[0025] The LED control circuit provided in the embodiment of the present invention includes:

[0026] The light intensity sensing module 110 is used to sense the external light intensity and output a light intensity sensing signal according to the light intensity;

[0027] An integrated control module 120, connected to the light intensity sensing module 110, for outputting an LED control signal according to the light intensity sensing signal;

[0028] The LED lamp group 130 includes at least one LED lamp, connected to the integrated control module 120, and configured to be turned on and off under the control of the LED control signal; and

[0029] The hysteresis protection module 140 is connected to the light intensity sensing module 110. When the change of the light intensity sensing signal is sufficient to change the light emitting state of the LED light group controlled by the LED control signal, the conduction state of the hysteresis protection module changes to delay the change of the light intensity sensing signal.

[0030] In an embodiment of the present invention, the light intensity sensing module 110 is a device that can respond to the external light intensity, and can be a photosensor, such as a photoresistor, a phototransistor, a phototube or other photosensitive devices, which can output different light intensity sensing signals according to the external light intensity. The light intensity sensing signal can be a voltage signal, a current signal, etc. depending on the different photosensors used, and the present invention does not limit this.

[0031] In an embodiment of the present invention, the integrated control module 120 is the control core of the entire control circuit. It can output an LED control signal according to the light intensity sensing signal output by the light intensity sensing module 110 to control the light emitting state of the LED lamp group. The integrated control module realizes the control function of the control circuit by integrating multiple discrete devices into an IC (Integrated Circuit) chip.

[0032] In the embodiment of the present invention, the LED light group 130 responds to the LED control signal sent by the integrated control module 120, is composed of at least one LED light, and can illuminate the monitoring range of the security monitoring camera.

[0033] In the embodiment of the present invention, the hysteresis protection module 140 has a hysteresis function, which adjusts the light intensity sensing signal by changing its own conduction state, thereby preventing the light intensity sensing signal from changing too quickly and causing the LED light to flicker.

[0034] The integrated control circuit of the embodiment of the present invention integrates discrete devices into an integrated control module, the circuit is simple and flexible, the cost of peripheral devices is low, and the reliability of the whole machine is high. The hysteresis function of the circuit is realized through the hysteresis protection module to avoid flickering of LED lights, extend the service life of LED lights, and reduce monitoring costs.

[0035] In the LED control circuit provided by the embodiment of the present invention, the light intensity sensing module includes:

[0036] A photoresistor unit, comprising at least one photoresistor, one end of which is connected to a power source, and the other end of which is connected to one end of a voltage-dividing resistor unit; and

[0037] The voltage-dividing resistor unit includes at least one fixed-value resistor, and the other end of the voltage-dividing resistor unit is grounded.

[0038] In the embodiment of the present invention, Figure 2 As shown, the light intensity sensing module is composed of a photoresistor and a voltage-dividing resistor, wherein one end of the photoresistor Cds is directly connected to the power supply VIN, and the other end is connected to the resistor R15 through the resistor R14, the resistor R14 and the resistor R15 form a voltage-dividing resistor, and the resistor R15 is grounded; as a preferred embodiment of the present invention, the photoresistor Cds adopts a visible light photoresistor for sensing visible light, and whether the resistor R14 and the resistor R15 adopt a fixed resistor or a variable resistor, a winding resistor or a non-winding resistor, and the resistance value of the resistor is selected according to the actual circuit design, and the present invention does not limit it.

[0039] As an embodiment of the present invention, a photoresistor unit and a voltage-dividing resistor unit are connected in series to a circuit, and the voltage-dividing resistor divides the voltage of the photoresistor. When the external illumination intensity changes, the resistance value of the photoresistor changes, causing the voltage across the photoresistor to change. The voltage across the photoresistor can be used as a light intensity sensing signal. When the external light intensity changes, the light intensity sensing signal will also change accordingly.

[0040] The light intensity sensing module provided in the embodiment of the present invention can convert the change of external light intensity into a voltage signal across the photoresistor through the combination of a photoresistor unit and a voltage divider resistor unit, and can accurately reflect the change of external light intensity, making it convenient to turn on the LED light group in time when the external light becomes dim.

[0041] In the LED control circuit provided by the embodiment of the present invention, the integrated control module is an integrated chip, including four pins, wherein:

[0042] The first pin is connected to the power supply and is used to supply power to the integrated control module;

[0043] The second pin is connected to the common end of the photoresistor unit and the voltage-dividing resistor unit, and is used to obtain the first signal voltage;

[0044] The third pin is connected to the LED light group, and is used to output the LED control signal to the LED light group; and

[0045] The fourth pin is connected to the LED lamp group through a sampling resistor, and is used for sampling the current flowing through the sampling resistor.

[0046] In the embodiment of the present invention, Figure 2 As shown, the integrated control module 120 has four pins, a first pin VI, a second pin PB, a third pin OUT and a fourth pin VS, wherein the first pin VI is connected to the power supply VIN for powering the integrated control module, the second pin PB is connected to a section of the photoresistor away from the power supply, serving as a receiving light pin for a light intensity sensing signal, and the voltage at one end of the photoresistor away from the power supply is input into the integrated control module as a light intensity sensing signal, and the third pin OUT and the fourth pin VS are both connected to the LED lamp group 130 for outputting LED control signals and sampling LED light emission signals.

[0047] As an embodiment of the present invention, VIN is connected to the power supply voltage; PB is connected to the voltage-dividing signal of the photoresistor Cds and the resistors R14 and R15, and is used as a switch signal to control whether the integrated control module 120 is turned on; OUT is connected to R1~R6, and OUT is the output end of the integrated control module 120, and outputs a constant current through R1~R6 to the LED light string; VS is connected to the connection between the resistor R6 and the LED light string, and R6 is used as a current sampling resistor, and the voltage drop on the resistor is fed back to the integrated control module to control the output current capacity of the power tube.

[0048] In the LED control circuit provided by the embodiment of the present invention, the integrated control module is a constant current integrated control module, comprising:

[0049] The first pin is connected to the emitter of the first triode, the collector of the second triode, the collector of the third triode and the cathode of the first diode, the anode of the first diode is connected to the second pin, the cathode of the second diode and one end of the first resistor, the other end of the first resistor is connected to the base of the first triode, the anode of the second diode is connected to the fourth pin, the emitter of the first triode is connected to the collector of the second triode, the collector of the fourth triode and one end of the second resistor, the other end of the second resistor is connected to the emitter of the second triode, the base of the third triode and one end of the third resistor, the other end of the third resistor is connected to the emitter of the third triode, the third pin, one end of the fourth resistor and the cathode of the third diode, the cathode of the third diode is connected to the fourth pin, the other end of the fourth resistor is connected to the base of the fourth triode, and the emitter of the fourth triode is connected to the fourth pin.

[0050] In the embodiment of the present invention, Figure 3As shown, the integrated circuit control module includes a first transistor Q5, a second transistor Q6, a third transistor Q7, and a fourth transistor Q8, a first diode D3, a second diode D4, and a third diode D5, a first resistor R20, a second resistor R21, a third resistor R22, and a fourth resistor R23, wherein the VI pin is connected to the emitter of the transistor Q5, the collector of the transistor Q6, the collector of the transistor Q7, and the cathode of the diode D3, the anode of the diode D3 is connected to the PB pin, the cathode of the diode D4, and one end of the resistor R20, the other end of the resistor R20 is connected to the base of the transistor Q5, and the anode of the diode D4 is connected to the base of the transistor Q5. The base of the transistor Q7 is connected to the VS pin, the emitter of the transistor Q5 is connected to the collector of the transistor Q6, the collector of the transistor Q7 and one end of the resistor R21, the other end of the resistor R21 is connected to the emitter of the transistor Q6, the base of the transistor Q7 and one end of the resistor R22, the other end of the resistor R22 is connected to the emitter of the transistor Q7, the OUT pin, one end of the resistor R23 and the cathode of the diode D5, the cathode of the diode D5 is connected to the VS pin, the other end of the resistor R23 is connected to the base of the transistor Q8, and the emitter of the transistor Q8 is connected to the VS pin. As an embodiment of the present invention, the VI pin is connected to a DC power supply. When the ambient light intensity is high, the resistance of the photoresistor Cds is small, and the voltage difference between VIN and PB at the PB pin is less than 0.7V. The PNP tube Q5 is in an off state, and the NPN tubes Q6~Q8 are also in an off state. At this time, there is no current output, and the LED light string is not lit. When the ambient light intensity becomes weaker, the resistance of the photoresistor Cds increases, and the voltage difference between VIN and PB at the PB pin is greater than 0.7V, the PNP tube Q5 is turned on, and the NPN tubes Q6~Q7 are turned on. At this time, the current flows through the Q7 tube through R1~R6, thereby lighting the LED light string.

[0051] The embodiment of the present invention integrates multiple discrete devices on an IC chip, has a simple and flexible circuit structure, low peripheral device cost, high overall reliability, and can control the on and off of LED lights according to changes in external light intensity.

[0052] In the LED control circuit provided in the embodiment of the present invention, the LED lamp group includes:

[0053] At least one LED lamp circuit, each LED lamp circuit is composed of one LED lamp or a plurality of LED lamps connected in series, each LED lamp circuit is connected to the third pin via a first protection resistor, and each LED lamp circuit is connected in parallel with each other.

[0054] As an embodiment of the present invention, Figure 2As shown, the LED lamp group 130 includes 6 LED lamp strings, each of which has 6 LED lamps connected in series. One end of each LED lamp string is connected to the OUT pin of the integrated control module through a protective resistor. The LED lamp is controlled by the LED control signal output by the integrated control module. The LED lamp can be a white LED lamp, and the power can be selected according to the actual circuit design. The protective resistor can be a fixed resistor or a variable resistor, which is not limited in the present invention. As an embodiment of the present invention, when the voltage on the resistor R6 is less than the NPN tube Q8 conduction voltage VBE (approximately equal to 0.7V), the NPN tube Q8 is in the off state, and the current of the NPN tubes Q6~Q7 will continue to increase. When the voltage on the resistor R6 reaches the NPN tube Q8 conduction voltage VBE or so, the NPN tube Q8 is turned on, and the base current of the NPN tube Q6 will be absorbed by the collector of Q8, thereby reducing the output current of Q6 and Q7. This action process forms a negative feedback loop, thereby realizing the constant current function. In the embodiment of the present invention, the constant current output current IO≈N*VBE / R19, where N is the number of light strings.

[0055] In the embodiment of the present invention, the internal power consumption of the integrated control module 120 is PD≈(VIN-OUT)*IO. When the input voltage VIN increases, the internal power consumption of the integrated control module 120 increases. Since the NPN tube Q8 is inside the integrated circuit, when the temperature increases, the on-state voltage VBE of Q8 decreases with the temperature, and the reduction range is about 2mV / ℃. Therefore, when VIN increases, the output current IO≈N*VBE / R19 will decrease, and it has an over-temperature protection function. When the internal temperature of the circuit increases, the output current decreases, thereby reducing the circuit power consumption and ensuring that the circuit is not burned.

[0056] As another embodiment of the present invention, the protection resistor of the LED lamp group does not include the resistor R19 in the previous embodiment. The function of the embodiment of the present invention is the same as that of the previous embodiment, except that the value of the constant current IO is changed. In the embodiment of the present invention, the constant current IO≈N*VBE / R6.

[0057] The embodiment of the present invention has a constant current function by connecting the LED lamp group to the integrated control module through a protective resistor. The current value can be flexibly adjusted through an external resistor, and the output current has high accuracy. It also has an over-temperature protection function. When the internal temperature of the circuit rises, the output current is reduced, thereby reducing the circuit power consumption and ensuring that the circuit is not burned.

[0058] In the control circuit of the LED of the security surveillance camera provided in the embodiment of the present invention, the hysteresis protection module includes:

[0059] A protection transistor, wherein the collector of the protection transistor is connected to the connection between the photoresistor unit and the voltage-dividing resistor unit, the emitter is grounded, and the base is grounded through a second protection resistor.

[0060] As an embodiment of the present invention, Figure 2 As shown, the hysteresis protection module 140 includes a protection transistor Q4, a first protection resistor R17 and a second protection resistor R18, wherein the collector of the protection transistor Q4 is connected to the photosensitive module and to an end of the resistor R15 away from the ground end, the emitter of the protection transistor Q4 is grounded, the base is connected to one end of the resistor R17, the other end of the resistor R17 is connected to one end of the resistor R18, and the other end of the resistor R18 is grounded.

[0061] In the embodiment of the present invention, the hysteresis function can be realized by the resistors R17, R18 and the NPN tube Q4. When the intensity of the external ambient light changes from strong to weak, the NPN tube Q4 changes from the off state to the on state, and the voltage of the PB pin is pulled down, so that the photoresistor Cds needs to become smaller to turn off the integrated control module 120, thereby realizing the hysteresis function and preventing the LED light from flickering when the light is not bright or dark.

[0062] The embodiment of the present invention provides a hysteresis protection module to slow down the change speed of the PB pin voltage when the external light is bright or dark, thereby preventing the LED from flickering.

[0063] The LED control circuit provided in the embodiment of the present invention further includes:

[0064] A feedback module is led out from the LED light group and connected to the integrated control module, and is used to sample the voltage information of the LED light group and feed it back to the integrated control module, wherein the voltage information is used by the integrated control module to determine the working state of the LED light group.

[0065] As an embodiment of the present invention, Figure 2 As shown, the feedback module is composed of a feedback resistor R16, one end of the feedback resistor R16 is connected to the LED light group, and the other end outputs a sampling voltage IRC, wherein the voltage IRC can be directly input into the integrated control module, so that the integrated control module can determine the working status of the LED group.

[0066] The embodiment of the present invention obtains the sampling voltage IRC of the LED lamp group by setting a feedback module. When the external ambient light intensity is high, the LED lamp string is turned off and the IRC outputs a low level; when the external ambient light intensity is weak, the LED lamp string is turned on and the IRC outputs a high level, which is convenient for determining the working state of the LED lamp group.

[0067] In the embodiment of the present invention, the integrated control circuit integrates discrete devices into the integrated control module, the circuit is simple and flexible, the cost of peripheral devices is low, and the reliability of the whole machine is high. The hysteresis function of the circuit is realized by the hysteresis protection module to avoid flickering of the LED lamp, extend the service life of the LED lamp, and reduce the monitoring cost; through the combination of the photoresistor unit and the voltage divider resistor unit, the change of the external light intensity can be converted into a voltage signal at both ends of the photoresistor, which can accurately reflect the change of the external light intensity, and is convenient for timely turning on the LED lamp group when the external light becomes dim. It has a constant current function and can flexibly adjust the current value through an external resistor, and the output current has high accuracy; it has an over-temperature protection function, and when the temperature inside the circuit rises, the output current is reduced, thereby reducing the power consumption of the circuit and ensuring that the circuit is not burned.

[0068] The embodiment of the present invention further provides a security monitoring camera, comprising:

[0069] An LED lighting lamp, wherein the LED lighting lamp is controlled by the LED control circuit described in any one of the above embodiments; and

[0070] The camera is used to monitor and record the area illuminated by the LED lighting lamp.

[0071] As an embodiment of the present invention, the LED lighting lamp is an LED lamp group in any of the above embodiments, and is controlled by the control circuit of the LED in any of the above embodiments, wherein the camera can be an analog camera or a digital camera, and the camera is used to record the area illuminated by the LED lighting lamp. In the embodiment of the present invention, when the external light intensity is high, the LED lamp is turned off under the control of the control circuit, and the camera can also clearly capture the image of the monitored area with the help of natural light; when the external light is insufficient, the LED lighting lamp emits light under the control of the control circuit to illuminate the monitored area, and the camera can clearly capture the image of the monitored area with the help of the light of the LED lighting lamp.

[0072] The embodiment of the present invention adjusts the lighting state of the LED lighting lamp according to the external light intensity. When the external light intensity is strong, the LED lamp is turned off, and the camera uses the external natural light to shoot the monitoring area; when the external light intensity is weak, the LED lamp is controlled to emit light to illuminate the monitoring area, ensuring that the camera can capture clear monitoring images 24 hours a day.

[0073] The embodiment of the present invention further provides a security monitoring system, comprising:

[0074] At least one security surveillance camera as described in the above embodiment, used for monitoring and recording; and

[0075] The storage medium is used to receive and store the surveillance video generated by the security surveillance camera.

[0076] As an embodiment of the present invention, the security monitoring system is used to monitor a designated area, uses a camera to monitor the monitoring area, and transmits the monitoring images to a storage medium in real time for storage, so that the staff can view them conveniently.

[0077] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0078] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A control circuit for an LED, characterized in that: The control circuit of the LED includes: a light intensity sensing module, which is used to sense the external light intensity and output a light intensity sensing signal according to the light intensity; an integrated control module, which is connected to the light intensity sensing module and is used to output an LED control signal according to the light intensity sensing signal; an LED lamp group, which includes at least one LED lamp, which is connected to the integrated control module and is used to light up and turn off under the control of the LED control signal; and a hysteresis protection module, which is connected to the light intensity sensing module, and when the change of the light intensity sensing signal is sufficient to change the light emitting state of the LED lamp group controlled by the LED control signal, the conduction state of the hysteresis protection module is changed to delay the change of the light intensity sensing signal; The light intensity sensing module includes: a photoresistor unit, including at least one photoresistor, one end of the photoresistor unit is connected to a power source, and the other end is connected to one end of a voltage-dividing resistor unit; and a voltage-dividing resistor unit, including at least one fixed value resistor, and the other end of the voltage-dividing resistor unit is grounded; The integrated control module is an integrated chip, comprising four pins, wherein: the first pin is connected to a power supply, for supplying power to the integrated control module; the second pin is connected to a common end of a photoresistor unit and a voltage divider resistor unit, for acquiring a first voltage signal; the third pin is connected to an LED light group, for outputting an LED control signal to the LED light group; and the fourth pin is connected to the LED light group via a sampling resistor, for sampling a current flowing through the sampling resistor; The integrated control module is a constant current integrated control module, comprising: a first pin connected to the emitter of the first triode, the collector of the second triode, the collector of the third triode and the cathode of the first diode, an anode of the first diode connected to the second pin, the cathode of the second diode and one end of the first resistor, the other end of the first resistor connected to the base of the first triode, an anode of the second diode connected to the fourth pin, an emitter of the first triode connected to the collector of the second triode, the collector of the fourth triode and one end of the second resistor, the other end of the second resistor connected to the emitter of the second triode, the base of the third triode and one end of the third resistor, the other end of the third resistor connected to the emitter of the third triode, the third pin, one end of the fourth resistor and the cathode of the third diode, the cathode of the third diode connected to the fourth pin, the other end of the fourth resistor connected to the base of the fourth triode, and the emitter of the fourth triode connected to the fourth pin; The hysteresis protection module comprises: a protection transistor, the collector of the protection transistor is connected to the connection between the photoresistor unit and the voltage-dividing resistor unit, the emitter is grounded, and the base is grounded through a second protection resistor.

2. The control circuit according to claim 1, characterized in that The LED lamp group includes: at least one LED lamp circuit, each LED lamp circuit is composed of one LED lamp or a plurality of LED lamps connected in series, each LED lamp circuit is connected to the third pin through a first protection resistor, and each LED lamp circuit is connected in parallel with each other.

3. The control circuit according to claim 2, characterized in that The LED lamp circuit is composed of 6 LED lamps connected in series, and the LED lamp group is composed of 6 LED lamp circuits connected in parallel.

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