Large bank light control circuit and phototherapy beauty instrument

Abstract

The utility model provides a large bank light control circuit and a phototherapy beauty instrument, which relate to the technical field of LED control and comprise an induced voltage module, an LED module and an LED current limiting module. The induced voltage module supplies power to the LED module, the LED module comprises a plurality of LED lamp groups which are connected in parallel, and the brightness and on-off of each LED lamp group are controlled by an LED current-limiting control circuit. The LED current-limiting control circuit is provided with an NMOS transistor and an NPN type triode, the NMOS transistor controls on-off of the LED lamp set, a grid electrode of the NMOS transistor is provided with a PWM input interface, the brightness of the corresponding LED lamp set is adjusted by changing the duty ratio of a PWM signal, and the NPN type triode is conducted when the current of the LED lamp set is too large, so that the NMOS transistor is cut off, and a lamp set loop is cut off. According to the utility model, the current of the lamp group is accurately controlled through PWM, different requirements are met, the lamp group loop is disconnected by using the transistor when the short circuit occurs, the harm caused by the short circuit of the LED lamp group is avoided, and the safety and reliability of the use of the large bank lamp circuit are enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of LED control, in particular to a large row of lamps control circuit and a light therapy beauty instrument. Background Art

[0002] LED technology has been widely used in many fields, including the medical beauty industry, due to its high energy efficiency, long life and environmental friendliness. In the field of phototherapy, LED is a non-invasive treatment method that uses light of different wavelengths to treat the skin to achieve whitening, wrinkle removal, and promote collagen synthesis. However, existing phototherapy beauty devices have some limitations, especially in the driving and control of LEDs. Due to the lack of precise current control, long-term use may cause LED overheating, short circuit or damage, resulting in lamp failure. In addition, inappropriate light intensity may cause damage to the skin, and excessive or strong light may accelerate skin aging or cause other side effects. Utility Model Content

[0003] In order to overcome the defects of the prior art, the technical problem to be solved by the utility model is to propose a large row of light control circuit and a light therapy beauty instrument, which adopts the following technical solutions:

[0004] A large row of lights control circuit, comprising an induced voltage module, an LED module and an LED current limiting control module; the voltage output end of the induced voltage module is electrically connected to the voltage input end of the LED module, and the LED current limiting control module is electrically connected to the LED module;

[0005] The LED module comprises a plurality of LED lamp groups connected in parallel, and each of the plurality of LED lamp groups is connected in series with a capacitor and a current limiting resistor;

[0006] The above-mentioned LED current limiting control module includes multiple independent LED current limiting control circuits, and the multiple LED current limiting control circuits are connected to the cathode ends of the multiple LED lamp groups one by one. The above-mentioned LED current limiting control circuit includes a first switch and a second switch. The above-mentioned second switch is used to control the on and off of the branch of the above-mentioned LED lamp group. When the above-mentioned first switch detects that the current flowing through the above-mentioned LED lamp group is too large, the above-mentioned second switch is controlled to be disconnected; the above-mentioned LED current limiting control circuit is also provided with a PWM input end for adjusting the brightness of the above-mentioned LED lamp group.

[0007] As a further improvement, it also includes a constant voltage output module and an MCU module. The induced voltage module supplies power to the constant voltage output module. The output end of the constant voltage output module is provided with a voltage regulator diode with a voltage regulation value of 3.6V, and supplies power to the MCU module. The MCU module controls the LED current limiting control circuit through a PWM signal, thereby adjusting the brightness of the LED lamp group.

[0008] As a further improvement, the first switch is an NPN transistor, and the second switch is an NMOS transistor; the drain of the NMOS transistor is electrically connected to the cathode end of the LED lamp group, the source is connected to a detection resistor and grounded, and the PWM input end is connected to the gate of the NMOS transistor after a current limiting resistor; the base of the NPN transistor is connected to the source of the NMOS transistor, the collector is connected to the gate of the NMOS transistor, and the emitter is grounded; a protection resistor is arranged between the PWM input end and the emitter of the NPN transistor.

[0009] As a further improvement, the MCU module is electrically connected to a key switch for controlling the switching of the working mode of the LED module; the key switch is further electrically connected to a digital tube display module, and the digital tube display module is used to display the working mode of the LED module.

[0010] As a further improvement, it also includes a voice module, the constant voltage output module supplies power to the voice module, the voice module is controlled by the MCU module, and is used to announce the working mode of the LED module.

[0011] As a further improvement, the induced voltage module is provided with a TYPE-C input interface for connecting a charging adapter, and the AC power supplies power to the induced voltage module through the charging adapter.

[0012] As a further improvement, the multiple LED light groups are respectively a red light LED light group, an infrared light LED light group, a blue light LED light group, a green light LED light group and a yellow light LED light group.

[0013] As a further improvement, the above-mentioned induced voltage module includes a chip CH221 K and its peripheral circuits.

[0014] As a further improvement, the above constant voltage output module includes a chip ME3116AM6G and its peripheral circuits.

[0015] A light therapy beauty instrument comprises the large row of lights control circuit as described in any one of the above items.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] First, the utility model is provided with multiple LED light groups, which respectively control red light, infrared light, blue light, yellow light and green light, and realize the spectrum combination of 5 different wavelengths, and by setting the LED current limiting control module, when the current flowing through the LED light group is too large, the NPN transistor is turned on and the NMOS transistor is turned off, so that the LED light group DC circuit is cut off, protecting the LED light group from damage, and the independent design of each LED current limiting control circuit also makes the fault location more accurate, and is convenient for maintenance and repair. This structure significantly enhances the safety and reliability of the circuit, prolongs the service life of the LED light group, and can make the product safer and more reliable when applied to the field of phototherapy and beauty.

[0018] Secondly, the utility model adjusts the luminous intensity of the LED module by controlling the PWM signal through the MCU, and realizes fine brightness adjustment by adjusting the duty cycle of the PWM signal, which can adapt to the lighting requirements and user needs of different environments in the field of phototherapy and beauty.

[0019] Thirdly, the present invention can conveniently switch the working mode of the LED module through the key switch and the digital tube display module connected by the MCU module, and can clearly display the current working status through the digital tube. In addition, the integrated voice module can broadcast the working mode, providing a more convenient and intuitive operating experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the following is a brief introduction to the drawings required for use in the implementation mode. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the utility model;

[0022] Figure 2 This is a schematic diagram of the connection between an LED lamp group and an LED current limiting control circuit according to an embodiment of the utility model;

[0023] Figure 3 This is a circuit diagram of an LED module according to an embodiment of the present utility model;

[0024] Figure 4 This is a circuit structure diagram of an LED current limiting control module according to an embodiment of the utility model;

[0025] Figure 5 This is a circuit structure diagram of an induced voltage module according to an embodiment of the utility model;

[0026] Figure 6This is a circuit diagram of a constant voltage output module according to an embodiment of the utility model;

[0027] Figure 7 This is a circuit diagram of an MCU module according to an embodiment of the present utility model;

[0028] Figure 8 This is a circuit diagram of a voice module according to an embodiment of the present utility model;

[0029] Fig. 9 This is a circuit structure diagram of a digital tube display module according to an embodiment of the utility model;

[0030] Fig.10 The figure is a schematic diagram of the irradiation surface structure of a light therapy beauty device according to an embodiment of the utility model.

[0031] Reference numerals:

[0032] 1- induced voltage module; 2- LED module; 3- LED current limiting control module; 4- constant voltage output module; 5- MCU module; 6- digital tube display module; 7- voice module;

[0033] 21- red light LED light group; 22- infrared light LED light group; 23- yellow light LED light group; 24- blue light LED light group; 25- green light LED light group;

[0034] 31-LED current limiting control circuit. DETAILED DESCRIPTION

[0035] In order to facilitate understanding by those skilled in the art, the structure of the present invention is further described in detail with reference to the accompanying drawings:

[0036] In the description of the present invention, the terms "one" and "two" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. The orientation or positional relationship indicated by the terms "portion", "side", "end", etc. is based on the orientation or positional relationship shown in the drawings and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0037] like Figure 1 As shown, the present application provides a large row of lights control circuit, including an induced voltage module 1, an LED module 2 and an LED current limiting control module 3; wherein, the voltage output end of the induced voltage module 1 is electrically connected to the voltage input end of the LED module 2, and the LED current limiting control module 3 is electrically connected to the LED module 2.

[0038] like Figure 2-Figure 3As shown, the LED module 2 includes multiple LED lamp groups connected in parallel, and each of the multiple LED lamp groups is connected in series with a capacitor and a current-limiting resistor.

[0039] In a specific embodiment, the multiple LED light groups are respectively a red LED light group 21, an infrared LED light group 22, a blue LED light group 24, a green LED light group 25 and a yellow LED light group 23. Among them, the anode end of the red LED light group 21 is provided with a current limiting resistor R9 with a resistance value of 36Ω, and the cathode end is connected in series with a 10nF / 25V capacitor C13, and the above-mentioned LED current limiting control circuit is connected between the capacitor C13 and the cathode end of the red LED light group 21. The structures of the infrared, blue, green and yellow LED light groups 23 are similar to those of the red LED light group 21. Since each color of LED has its own specific forward voltage, for example, the forward voltage of the red LED is generally between 1.8 and 2.2 V, while the forward voltages of the blue and green LEDs are usually around 3.0 to 3.5 V. Therefore, the resistance values ​​of the current limiting resistors connected in series with different light groups are different. In this embodiment, the resistance value of the current limiting resistor connected in series with the infrared LED light group 22 is 100 Ω, the resistance value of the current limiting resistor connected in series with the yellow LED light group 23 is 36 Ω, the resistance value of the current limiting resistor connected in series with the blue LED light group 24 is 180 Ω, and the resistance value of the current limiting resistor connected in series with the green LED light group 25 is 200 Ω.

[0040] like Figure 1 , Figure 2 and Figure 4 As shown, the LED current limiting control module 3 includes multiple independent LED current limiting control circuits, which are connected to the cathode ends of multiple LED lamp groups one by one. The LED current limiting control circuit includes a first switch and a second switch. The second switch is used to control the on and off of the branch of the LED lamp group. When the first switch detects that the current flowing through the LED lamp group is too large, it controls the second switch to be disconnected. Figure 4 The LED current limiting control circuit shown is also provided with a PWM input terminal for adjusting the brightness of the LED lamp group.

[0041] In a specific embodiment, the first switch is an NPN transistor, and the second switch is an NMOS transistor; the drain of the NMOS transistor is electrically connected to the cathode end of the LED lamp group, the source is connected to a detection resistor and grounded, and the PWM input end is connected to the gate of the NMOS transistor after a current limiting resistor; the base of the NPN transistor is connected to the source of the NMOS transistor, the collector is connected to the gate of the NMOS transistor, and the emitter is grounded; a protection resistor is arranged between the PWM input end and the emitter of the NPN transistor.

[0042] For more specific information, see Figure 2 , Figure 2The schematic diagram of the connection between the red light LED lamp group 21 and the LED current limiting control circuit includes an NMOS transistor Q3, an NPN transistor Q4, a current limiting resistor R18, a detection resistor R17 and a protection resistor R19. The PWM signal is transmitted from the current limiting resistor R18 to the gate of Q3. When the PWM signal is at a high level, the gate voltage of Q3 is higher than the threshold value, making it conductive, and the LED lamp group lights up; when the PWM signal is at a low level, the gate voltage of Q3 is lower than the threshold value, making it cut off, and the LED lamp group turns off; by changing its duty cycle, that is, the proportion of time occupied by the high level state in a cycle, the average current flowing through the LED is controlled. The higher the duty cycle, the greater the average current flowing through the LED, and thus the brighter the light emitted by the LED; on the contrary, the lower the duty cycle, the dimmer the brightness of the LED.

[0043] like Figure 2 As shown, the LED current limiting control circuit can also cut off the circuit when the LED light group is overcurrent. When the LED light group is short-circuited, the current of the circuit increases, and the voltage across the detection resistor R17 increases, causing Q4 to turn on and conduct. At this time, the high-level signal of PWM passes through the collector to the emitter of Q4, and the gate voltage is lower than the threshold and cuts off, so that the LED light group branch is disconnected to protect the LED light group from damage. The infrared light, blue light, green light and yellow light LED light groups are similar in structure to the red light LED light group 21, and the LED current limiting control circuits of each color light LED light group are independent of each other. When a certain light group fails, it will not affect the operation of other light groups. This also makes the fault location more accurate and convenient for maintenance and repair. The above structure significantly enhances the safety and reliability of the circuit, prolongs the service life of the LED light group, and can make the product safer and more reliable when applied to the field of phototherapy and beauty.

[0044] like Figure 1 , Figure 6 and Figure 7 As shown, it also includes a constant voltage output module 4 and an MCU module 5. The induced voltage module 1 supplies power to the constant voltage output module 4. The output end of the constant voltage output module 4 is provided with a voltage regulator diode with a voltage regulation value of 3.6V, and supplies power to the MCU module 5. The MCU module 5 controls the LED current limiting control circuit through a PWM signal, thereby adjusting the brightness of the LED lamp group.

[0045] like Figure 1 , Figure 7-Figure 9 As shown, the MCU module 5 is electrically connected to a key switch for controlling the switching of the working mode of the LED module 2; the key switch is further electrically connected to a digital tube display module 6, and the digital tube display module 6 is used to display the working mode of the LED module 2. Furthermore, it also includes a voice module 7, the constant voltage output module 4 supplies power to the voice module 7, and the voice module 7 is controlled by the MCU module 5 to announce the working mode of the LED module 2.

[0046] In a specific embodiment, the above working mode is formed by a combination of multiple LEDs. More specifically, multiple LED light groups are independently controlled to turn on and adjust the brightness through an LED current limiting control circuit, and are combined to form multiple lighting modes, and at least one group of LED light groups emits light in each mode. There are three key switches, including two mode selection keys and an on / off switch. Short press the selection key to switch to the previous mode or the next mode, and long press the selection key to switch quickly. After selecting the mode, press the on / off switch to start irradiation. The above working modes are numbered L1, L2...LN, respectively. During the mode selection, the number of the current mode, i.e. "LN", is displayed through the digital tube display module 6.

[0047] like Figure 5 As shown, the induced voltage module 1 is provided with a TYPE-C input interface for connecting a charging adapter, and the mains power is supplied to the induced voltage module 1 through the charging adapter. The induced voltage module 1 includes a chip CH221 K and its peripheral circuits.

[0048] like Figure 6 As shown, the constant voltage output module 4 includes a chip ME3116AM6G and its peripheral circuits.

[0049] The present application further provides a light therapy beauty device, comprising the above-mentioned large array light control circuit, which realizes 7 modes of light therapy through the combination arrangement of 5 different wavelengths.

[0050] like Fig.10 As shown, in a specific embodiment, the irradiation surface array of the light therapy beauty device is provided with a plurality of lighting units, each lighting unit includes five LED lamp beads, including a red light LED, an infrared light LED, a yellow light LED, a blue light LED and a green light LED, and the LED lamp beads of the same color light in each lighting unit are connected in series to form the above-mentioned LED lamp group.

[0051] Furthermore, there are seven working modes, namely red light + infrared light L1, yellow light + red light + near infrared light L2, green light + yellow light L3, blue light + red light L4, pure yellow light L5, pure red light L6, red light + green light + yellow light + blue light + near infrared light L7. After selecting the working mode, face the irradiated surface to the face and press the on / off switch to use it.

[0052] The above description is only the preferred implementation of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A large row of lights control circuit, characterized in that: It comprises an induced voltage module (1), an LED module (2) and an LED current limiting control module (3); the voltage output end of the induced voltage module (1) is electrically connected to the voltage input end of the LED module (2), and the LED current limiting control module (3) is electrically connected to the LED module (2); The LED module (2) comprises a plurality of LED light groups (21) connected in parallel with each other, and each of the plurality of LED light groups (21) is connected in series with a capacitor and a current-limiting resistor; The LED current limiting control module (3) comprises a plurality of mutually independent LED current limiting control circuits (31), the plurality of LED current limiting control circuits (31) being connected one-to-one to the cathode ends of the plurality of LED light groups (21), the LED current limiting control circuit (31) comprising a first switch and a second switch, the second switch being used to control the on and off of a branch of the LED light group (21), and the first switch controlling the second switch to be disconnected when detecting that the current flowing through the LED light group (21) is too large; the LED current limiting control circuit (31) is also provided with a PWM input end for adjusting the brightness of the LED light group (21).

2. A large row of lights control circuit as claimed in claim 1, characterized in that: The invention also comprises a constant voltage output module (4) and an MCU module (5), wherein the induced voltage module (1) supplies power to the constant voltage output module (4), the output end of the constant voltage output module (4) is provided with a voltage stabilizing diode with a voltage stabilizing value of 3.6V, and supplies power to the MCU module (5), and the MCU module (5) controls the LED current limiting control circuit (31) through a PWM signal, thereby adjusting the brightness of the LED lamp group (21).

3. A large row of lights control circuit as claimed in claim 2, characterized in that: The first switch is an NPN transistor, and the second switch is an NMOS transistor; the drain of the NMOS transistor is electrically connected to the cathode end of the LED lamp group (21), the source is connected to a detection resistor and grounded, and the PWM input end is connected to the gate of the NMOS transistor after passing through a current limiting resistor; the base of the NPN transistor is connected to the source of the NMOS transistor, the collector is connected to the gate of the NMOS transistor, and the emitter is grounded; a protection resistor is provided between the PWM input end and the emitter of the NPN transistor.

4. A large row of lights control circuit as claimed in claim 2, characterized in that: The MCU module (5) is electrically connected to a key switch for controlling the switching of the working mode of the LED module (2); the key switch is further electrically connected to a digital tube display module (6), and the digital tube display module (6) is used to display the working mode of the LED module (2).

5. A large row of lights control circuit as claimed in claim 4, characterized in that: It also comprises a voice module (7), the constant voltage output module supplies power to the voice module (7), the voice module (7) is controlled by the MCU module (5), and is used to announce the working mode of the LED module (2).

6. A large row of lights control circuit as claimed in claim 2, characterized in that: The induced voltage module (1) is provided with a TYPE-C input interface for connecting a charging adapter, and the mains electricity supplies power to the induced voltage module (1) through the charging adapter.

7. A large row of lights control circuit as claimed in claim 1, characterized in that: The multiple LED light groups are respectively a red light LED light group (21), an infrared light LED light group (22), a yellow light LED light group (23), a blue light LED light group (24) and a green light LED light group (25).

8. A large row of lights control circuit as claimed in claim 1, characterized in that: The induced voltage module (1) comprises a chip CH221 K and its peripheral circuits.

9. A large row of lights control circuit as claimed in claim 2, characterized in that: The constant voltage output module (4) comprises a chip ME3116AM6G and its peripheral circuits.

10. A light therapy beauty device, characterized in that: It comprises a large row of lights control circuit as described in any one of claims 1-9.

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