Phototherapy instrument and LED lamp driving circuit thereof

Abstract

The utility model discloses a phototherapy instrument and an LED lamp driving circuit thereof. The LED lamp driving circuit comprises a button module, a first switch module, a second switch module and a control module. The key module is used for controlling the on-off state of the first switch module; the control module detects the working state of the key module according to the on-off state of the first switch module and outputs a PWM control signal to the second switch module according to the working state of the key module so as to adjust the brightness of the LED lamp module. By adopting the PWM control mode, the technical scheme can realize the real-time and flexible adjustment of the brightness of one or more LED lamps, and does not need to change the current-limiting resistance value in the hardware design and the duty ratio of the PWM control signal to directly influence the average current flowing through the LED lamp module, so as to adjust the brightness, thereby realizing the accurate brightness control.

Description

Technical Field

[0001] The utility model relates to the technical field of physical therapy devices, in particular to a light therapy device and an LED lamp driving circuit thereof. Background Art

[0002] In traditional LED lamp driver circuit design, brightness adjustment is typically achieved by setting the resistance of a current-limiting resistor to control the current flowing through the LED, thereby affecting its brightness. The brightness of each LED is directly related to the current flowing through it. Therefore, during design, a fixed current-limiting resistor is calculated and selected based on the LED's operating current requirement and the desired brightness. However, this approach has some limitations:

[0003] 1. If you need to adjust the brightness of a single or multiple LEDs, you must change the resistance of the current-limiting resistor. Each time you adjust the brightness, you must redesign the circuit and change the resistance value to achieve the new brightness level.

[0004] 2. In actual applications, especially in lighting systems with multiple LEDs, the brightness needs to be flexibly adjusted due to different usage scenarios or user needs. However, the use of fixed current-limiting resistors cannot achieve real-time adjustment. Utility Model Content

[0005] The embodiment of the present utility model provides a light therapy device and an LED lamp driving circuit thereof to solve the above-mentioned technical problems.

[0006] A first aspect of an embodiment of the present invention provides an LED lamp driving circuit for a phototherapy device, comprising: a key module, a first switch module, a second switch module, and a control module;

[0007] One end of the button module receives a first power supply voltage, the other end of the button module is connected to the control end of the first switch module, one end of the first switch module receives a second power supply voltage, the other end of the first switch module is grounded, and the button module is used to control the on / off state of the first switch module;

[0008] The detection end of the control module is connected to one end of the first switch module, the output end of the control module is connected to the control end of the second switch module, one end of the second switch module is connected to the LED lamp module, and the other end of the second switch module is grounded;

[0009] The control module detects the on / off state of the first switch module and outputs a PWM control signal to the second switch module.

[0010] Optionally, the second switch module is a first MOS tube, and the LED lamp driving circuit further includes a first resistor, a second resistor and a third resistor;

[0011] One end of the first resistor receives a third power supply voltage, the other end of the first resistor is connected to one end of the LED lamp module, the other end of the LED lamp module is connected to the drain of the first MOS transistor, the gate of the first MOS transistor is respectively connected to one end of the second resistor and one end of the third resistor, the source of the first MOS transistor and the other end of the third resistor are commonly grounded, and the other end of the second resistor is connected to the output end of the control module.

[0012] Optionally, the LED lamp driving circuit also includes a third switch module, a power-on module and a step-down module, the control end of the third switch module is connected to the other end of the button module, one end of the third switch module is connected to the control end of the power-on module, the other end of the third switch module is grounded, the input end of the power-on module receives a third power supply voltage, the output end of the power-on module is connected to the input end of the step-down module, and the output end of the step-down module is connected to the power supply end of the control module.

[0013] Optionally, the third switch module includes a fourth transistor and a fourteenth resistor, one end of the fourteenth resistor is the control end of the third switch module, the other end of the fourteenth resistor is connected to the base of the fourth transistor, the collector of the fourth transistor is one end of the third switch module, and the emitter of the fourth transistor is the other end of the third switch module.

[0014] Optionally, the LED lamp driving circuit also includes a fifth MOS tube, a nineteenth resistor and a twenty-first resistor, the drain of the fifth MOS tube is connected to the collector of the fourth transistor, the gate of the fifth MOS tube is respectively connected to one end of the nineteenth resistor and one end of the twenty-first resistor, the source of the fifth MOS tube and the other end of the nineteenth resistor are commonly connected to the ground, and the other end of the twenty-first resistor is the first starting end.

[0015] Optionally, the LED lamp driving circuit also includes a sixth transistor, a sixteenth resistor and a twenty-second resistor, the collector of the sixth transistor is connected to the collector of the fourth transistor, the gate of the sixth transistor is connected to one end of the sixteenth resistor, the other end of the sixteenth resistor and one end of the twenty-second resistor are connected together as a second starting end, and the emitter of the sixth transistor and one end of the twenty-second resistor are connected together to ground.

[0016] Optionally, the startup module includes a seventh MOS tube, a twenty-fourth capacitor, a twenty-fifth electrolytic capacitor, a twenty-sixth capacitor, a twenty-sixth resistor and a twenty-seventh resistor. One end of the twenty-fourth capacitor, one end of the twenty-sixth resistor and the source of the seventh MOS tube are connected together and constitute the input end of the startup module. The other end of the twenty-sixth resistor and one end of the twenty-seventh resistor are connected together as the control end of the startup module. The gate of the seventh MOS tube is connected to the other end of the twenty-seventh resistor. The drain of the seventh MOS tube, the positive electrode of the twenty-fifth electrolytic capacitor and one end of the twenty-sixth capacitor are connected together as the output end of the startup module. The twenty-fourth capacitor, the negative electrode of the twenty-fifth electrolytic capacitor and the other end of the twenty-sixth capacitor are connected to the ground.

[0017] Optionally, the step-down module includes a fourth chip, an inductor, a sixteenth capacitor, an eighteenth capacitor, a nineteenth capacitor, a thirtieth resistor and a thirty-first resistor. The first input terminal, the second input terminal and one end of the sixteenth capacitor of the fourth chip are commonly connected as the input terminal of the step-down module. The output terminal of the fourth chip is connected to one end of the inductor, and the other end of the inductor, one end of the thirtieth resistor, one end of the eighteenth capacitor and one end of the nineteenth capacitor are commonly connected as the output terminal of the step-down module. The feedback terminal of the fourth chip is respectively connected to the other end of the thirtieth resistor, the other end of the eighteenth capacitor and one end of the thirty-first resistor. The ground terminal of the fourth chip, the other end of the thirty-first resistor and the other end of the nineteenth capacitor are commonly connected to the ground.

[0018] Optionally, the LED lamp module includes a first LED lamp, a second LED lamp, a third LED lamp, a fourth LED lamp and a fifth LED lamp, the anode of the first LED lamp, the anode of the second LED lamp, the anode of the third LED lamp, the anode of the fourth LED lamp and the anode of the fifth LED lamp are connected together as one end of the LED lamp module, and the cathode of the first LED lamp, the cathode of the second LED lamp, the cathode of the third LED lamp, the cathode of the fourth LED lamp and the cathode of the fifth LED lamp are connected together as the other end of the LED lamp module.

[0019] A second aspect of an embodiment of the present invention provides a light therapy device, comprising: the LED lamp driving circuit and LED lamp module described in the first aspect.

[0020] The technical effect of this embodiment of the utility model is that by using a PWM control signal to control the brightness of the LED lamp module, the limitation of adjusting brightness by changing the current-limiting resistor in traditional LED lamp driver circuits is avoided. By adopting a PWM control method, this technical solution can achieve real-time and flexible adjustment of the brightness of single or multiple LEDs without changing the current-limiting resistor value in the hardware design. The duty cycle of the PWM control signal directly affects the average current flowing through the LED lamp module, thereby adjusting its brightness, thereby achieving precise brightness control. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0022] Figure 1 This is a first structural diagram of an LED lamp driving circuit of a phototherapy device provided in the first embodiment of the present utility model;

[0023] Figure 2 This is a circuit diagram showing the connection between a key module and a first switch module in an LED lamp driving circuit of a phototherapy device provided in the first embodiment of the present invention;

[0024] Figure 3 This is a circuit diagram of the connection between the LED lamp module and the second switch module in the LED lamp driving circuit of a light therapy device provided by the first embodiment of the present invention;

[0025] Figure 4 This is a second structural diagram of an LED lamp driving circuit of a phototherapy device provided in the first embodiment of the present utility model;

[0026] Figure 5 This is a partial circuit diagram of an LED lamp driving circuit of a phototherapy device provided in Example 1 of the present utility model;

[0027] Figure 6 This is a circuit diagram of a power-on module in an LED lamp driving circuit of a phototherapy device provided in the first embodiment of the present invention;

[0028] Figure 7 This is a circuit diagram of a step-down module in an LED lamp driving circuit of a phototherapy device provided in Example 1 of the present utility model;

[0029] Figure 8 This is a circuit diagram of a control module in an LED lamp driving circuit of a phototherapy device provided in Example 1 of the present utility model;

[0030] In the figure: 10, LED lamp driving circuit; 20, LED lamp module; 101, button module; 102, first switch module; 103, second switch module; 104, control module; 105, third switch module; 106, power-on module; 107, step-down module. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] It should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to make the disclosure thorough and complete and to fully convey the scope of the present invention to those skilled in the art. In the drawings, the dimensions and relative dimensions of layers and regions may be exaggerated for clarity. Like reference numerals denote like elements throughout.

[0033] It should be understood that when an element or layer is referred to as being "on," "adjacent to," "connected to," or "coupled to" another element or layer, it may be directly on, adjacent to, connected to, or coupled to the other element or layer, or there may be intervening elements or layers. Conversely, when an element is referred to as being "directly on," "directly adjacent to," "directly connected to," or "directly coupled to" another element or layer, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers, and / or parts, these elements, components, regions, layers, and / or parts should not be limited by these terms. These terms are merely used to distinguish one element, component, region, layer, or part from another element, component, region, layer, or part. Therefore, without departing from the teachings of the present invention, the first element, component, region, layer, or part discussed below may be represented as a second element, component, region, layer, or part.

[0034] Spatially relative terms such as "under," "beneath," "below," "under," "above," "above," etc., may be used herein for convenience of description to describe the relationship of one element or feature shown in the figures to other elements or features. It should be understood that the spatially relative terms are intended to include different orientations of the device in use and operation in addition to the orientations shown in the figures. For example, if the device in the drawings is flipped, then the elements or features described as "under" or "beneath" or "beneath" the other elements will be oriented as "over" the other elements or features. Thus, the exemplary terms "under" and "under" may include both the upper and lower orientations. The device may be oriented otherwise (rotated 90 degrees or in other orientations) and the spatial descriptors used herein are interpreted accordingly.

[0035] The purpose of the terms used herein is only to describe specific embodiments and is not intended to limit the present invention. When used herein, the singular forms "a", "an" and "the" are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "comprising" and / or "including", when used in this specification, determine the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0036] In order to fully understand the present invention, the following description will provide detailed structures and steps to illustrate the technical solutions proposed by the present invention. The preferred embodiments of the present invention are described in detail below. However, in addition to these detailed descriptions, the present invention may also have other implementation methods.

[0037] Example 1

[0038] This embodiment provides an LED lamp driving circuit 10 of a light therapy device, such as Figure 1 As shown, it includes: a button module 101, a first switch module 102, a second switch module 103 and a control module 104;

[0039] One end of the button module 101 receives a first power supply voltage, the other end of the button module 101 is connected to the control end of the first switch module 102, one end of the first switch module 102 receives a second power supply voltage, the other end of the first switch module 102 is grounded, and the button module 101 is used to control the on / off state of the first switch module 102;

[0040] The detection end of the control module 104 is connected to one end of the first switch module 102, the output end of the control module 104 is connected to the control end of the second switch module 103, one end of the second switch module 103 is connected to the LED lamp module 20, and the other end of the second switch module 103 is grounded;

[0041] The control module 104 detects the working state of the button module 101 according to the on / off state of the first switch module 102 , and outputs a PWM control signal to the second switch module 103 according to the working state of the button module 101 to adjust the brightness of the LED lamp module 20 .

[0042] The button module 101 is used to control the on / off state and brightness adjustment of the LED light module 20. When the user presses the button module 101, it turns on, transmitting a control signal to the first switch module 102, triggering a change in its on / off state. The first switch module 102 controls the on / off state of the circuit, ensuring that the device only activates when the button module 101 is triggered. When the button module 101 is on, the first switch module 102 receives the control signal from the button module 101 and turns on the circuit, allowing current to flow through the circuit. The control module 104, as the core processing unit, detects the operating status of the button module 101, generates a PWM control signal, and controls the brightness of the LED light module 20. The detection terminal of the control module 104 is connected to the first switch module 102, monitoring its on / off state in real time. When the button module 101 is pressed and the first switch module 102 turns on, the control module 104 detects that the button module 101 has been pressed. Based on the operating status of the button module 101, the control module 104 outputs a PWM control signal with a different duty cycle to the second switch module 103. The duty cycle of the PWM control signal determines the brightness of the LED light module 20. When the duty cycle is high, the LED brightness is high; when the duty cycle is low, the LED brightness is low. The second switch module 103 is a PWM driver module, used to control the on / off state and brightness adjustment of the LED light module 20. When the control module 104 outputs a PWM control signal to the control terminal of the second switch module 103, the second switch module 103 adjusts the brightness of the LED light module 20 according to the duty cycle of the PWM control signal. When the PWM control signal is high, the second switch module 103 turns on, illuminating the LED light module 20; when the PWM control signal is low, the second switch module 103 turns off, extinguishing the LED light module 20. By adjusting the duty cycle of the PWM control signal, the brightness of the LED light module 20 can be controlled. Based on the PWM control signal from the control module 104, the second switch module 103 flexibly controls the brightness of the LED light module 20, providing smooth brightness changes suitable for different treatment scenarios of the light therapy device. The PWM control signal enables lower power consumption and precise brightness output control. The LED light module 20 provides the light source required for phototherapy. When the duty cycle of the PWM control signal is high, the brightness of the LED light module 20 is high; when the duty cycle is low, the brightness of the LED light module 20 is low. Using the PWM control signal, the brightness of the LED light module 20 can be efficiently adjusted according to treatment needs, thereby improving the phototherapy effect. Furthermore, the LED light module 20 can be driven to reduce power consumption and extend its service life.

[0043] The technical effect of this solution is that it uses PWM control signals to control the brightness of LED light modules, avoiding the limitations of conventional LED light driver circuits that rely on changing current-limiting resistors to adjust brightness. By adopting PWM control, this solution enables real-time and flexible brightness adjustment of single or multiple LEDs without having to change the current-limiting resistor value in the hardware design. The duty cycle of the PWM control signal directly affects the average current flowing through the LED light module, thereby adjusting its brightness, thereby achieving precise brightness control. Compared to conventional current-limiting resistor adjustment methods, this solution offers the following advantages: It eliminates the need to constantly change the current-limiting resistor value in the circuit. Simply adjusting the duty cycle of the PWM control signal via software allows for real-time adjustment of the LED light brightness to meet the needs of different scenarios. PWM control allows for more precise control of the brightness range, allowing for multi-level or continuous brightness adjustment. Removing the need for repeated modifications to the current-limiting resistor design reduces circuit design complexity and subsequent maintenance costs, making the driver circuit more adaptable to a variety of application scenarios. By introducing a PWM control signal adjustment circuit, this solution effectively overcomes the limitations of conventional current-limiting resistor dimming methods, achieving flexible, precise, and efficient LED brightness control.

[0044] The control module 104 acquires and adjusts the PWM duty cycle by detecting the working state of the button module 101 to control the brightness of the LED lamp module.

[0045] As an embodiment, the control module 104 monitors the status of the button module 101 in real time. Different operations of the button module 101 (such as a short press, long press, and double press) can be mapped to different duty cycles of the PWM control signal, thereby adjusting the brightness of the LED light. Each time the button is pressed, the control module 104 detects the button being pressed and released, and switches to the next preset brightness level (low, medium, or high). Each brightness level corresponds to a different duty cycle of the PWM control signal. For example: first short press: 20% duty cycle (low brightness); second short press: 50% duty cycle (medium brightness); third short press: 100% duty cycle (high brightness); and third short press: cycle back to 20% duty cycle. While the button is held down, the control module 104 can adjust the brightness by linearly or nonlinearly increasing the duty cycle of the PWM control signal until the button is released. The longer the long press, the higher the duty cycle of the PWM control signal, and the brightness of the LED light module gradually increases until the user's desired brightness level is reached. At this time, the control module 104 dynamically adjusts the duty cycle of the PWM control signal according to the long press duration, for example, gradually increasing it from 20% to 100%. The control module 104 can also set the duty cycle of the PWM control signal to the maximum or minimum value by detecting that the key has been quickly pressed twice. For example, if the key is double-pressed, it will jump directly to 100% brightness or switch to the off state.

[0046] The control module 104 detects the operating status of the key using a timer or interrupt mechanism. Typically, the key input is connected to a pin of the control module 104, and the key status is indicated by pulling the voltage high or low. Based on the duration and frequency of the key press, the control module 104 can determine the type of operation (short press, long press, double press, etc.) and assign a corresponding duty cycle to the PWM control signal based on the different operations. When a key press is detected and the duration is within the short press range (e.g., less than 1 second), the control module 104 switches to the next preset duty cycle level of the PWM control signal. When a key press is detected for a certain duration (e.g., more than 1 second), continuous duty cycle adjustment is initiated until the key is released. If the key is pressed twice in rapid succession, the control module 104 can directly set the duty cycle of the PWM control signal to the highest or lowest value. The control module 104 includes a PWM control signal generator. When a change in the key state is detected, the control module 104 adjusts the register value of the PWM control signal's duty cycle, thereby controlling the PWM control signal's duty cycle. For example, in an MCU, the control module 104 generates PWM control signals with different frequencies and duty cycles by adjusting the timer period and duty cycle registers. The control module 104 changes the duty cycle value of the PWM control signal by increasing or decreasing it (for example, a duty cycle of 20%, 50%, or 100%). When the control module 104 detects a long press, it gradually increases the duty cycle value of the PWM control signal, gradually increasing the duty cycle of the PWM control signal from a small value (such as 20%) to a maximum value (such as 100%).

[0047] The technical effect of this embodiment is that the control module dynamically adjusts the duty cycle of the PWM control signal by detecting the working status of the button (such as short press, long press, double press, etc.), thereby achieving precise control of the LED brightness. At the same time, the different parameters of the button operation are directly mapped to the change of the PWM duty cycle, thereby achieving a flexible brightness adjustment effect.

[0048] As a second implementation, the control module 104 obtains the duty cycle according to the on-time of the key module 101 and outputs a PWM control signal according to the duty cycle.

[0049] When a key is pressed, the control module 104 detects a change in the pin level (e.g., from a high level to a low level). Upon detecting a key press, the control module 104 starts a timer to measure the key's on-time. The timer starts when the key is pressed and continues until the key is released. The control module 104 continues to monitor the key's status. When the key is released, the control module 104 detects another change in the pin level (e.g., from a low level back to a high level). Upon release, the timer stops and records the total time the key is pressed. The control module 104 determines the duty cycle of the corresponding PWM control signal based on the duration the key is pressed. Generally, the longer the key is pressed, the higher the duty cycle. This can be implemented as a linear or nonlinear mapping. For example: a short key press (<1 second): a 20% duty cycle (low brightness). A medium key press (1-2 seconds): a 50% duty cycle (medium brightness). A long key press (>2 seconds): a 100% duty cycle (high brightness). Based on the determined duty cycle, the control module 104 configures a PWM generator to output a PWM control signal with a corresponding duty cycle. The frequency of the PWM control signal is usually fixed. The control module 104 adjusts the duty cycle register so that the LED lamp module 20 adjusts the brightness according to the duty cycle of the signal.

[0050] The technical effect of this embodiment is that the user can flexibly adjust the brightness of the LED light module by pressing the button for a short time. A short press can achieve a lower brightness, and a long press can increase the brightness. The adjustment method provided by this embodiment is simple, intuitive, and easy to operate.

[0051] As a third implementation, the control module 104 obtains a duty cycle according to the number of times the key module 101 is turned on, and outputs a PWM control signal according to the duty cycle.

[0052] The control module 104 identifies each key operation by detecting the level change when the key is pressed. Each time a key is pressed, the control module 104 records a key event. The control module 104 sets a counter for key operations. When a key is pressed, the counter increases by 1. The counter records the number of times the key is pressed, and usually processes continuous press events detected within a short period of time (for example, within 1 second). The control module 104 detects whether the key is pressed continuously by setting a time window. Each time the key is released, the timer starts. If the key is pressed again within a preset time window (for example, 500 milliseconds to 1 second), it is considered a continuous press, otherwise the counter is reset. If no continuous key operation is detected within the time window, the control module 104 will proceed to the next step based on the number of key presses already recorded. When the number of key presses is determined, the control module 104 determines the duty cycle of the PWM control signal based on the number of key presses. The brightness increases sequentially after each key is pressed. For example: Press once: 20% duty cycle (low brightness); press twice: 50% duty cycle (medium brightness); press three times: 100% duty cycle (high brightness); press four times: return to 20% duty cycle (loop). Based on the duty cycle determined by the number of button presses, control module 104 configures a PWM control signal and outputs a PWM control signal with the corresponding duty cycle. The brightness of LED lamp module 20 changes according to the PWM control signal output by control module 104, and the LED brightness increases or decreases in sequence.

[0053] The technical effect of this embodiment is that the user can switch between different brightness levels by pressing the button multiple times without having to hold down the button for a long time. The user only needs to control the brightness adjustment by the number of times. It is easy to use and flexible to operate.

[0054] As an example, Figure 2 As shown, the button module 101 is a first button S1, the first switch module 102 is a third MOS transistor Q3, one end of the first button S1 receives a first power supply voltage V-BAT, the other end of the first button S1 is respectively connected to one end of a seventeenth resistor R17 and one end of an eighteenth resistor R18, the other end of the seventeenth resistor R17 is connected to the gate of the third MOS transistor Q3, the drain of the third MOS transistor Q3 and one end of an eleventh resistor R11 are connected together and then connected to the control module 104, the other end of the eleventh resistor R11 receives a second power supply voltage 3.3V, and the source of the third MOS transistor Q3 and the other end of the eighteenth resistor R18 are connected together to ground.

[0055] In this circuit design, the third MOS transistor Q3, the eleventh resistor R11, the seventeenth resistor R17, and the eighteenth resistor R18 work together to form a switch circuit that detects the state of the first button S1 and controls the on / off state of the circuit. The first button S1 is a switch for the manual control circuit. Operation of the first button S1 (pressing or releasing) determines whether the third MOS transistor Q3 is on or off, thereby controlling the operation of subsequent circuits. When the first button S1 is pressed, V-BAT applies a voltage to the gate of the third MOS transistor Q3 through the seventeenth resistor R17, turning it on. When the first button S1 is released, the gate voltage is pulled down, turning the third MOS transistor Q3 off. The seventeenth resistor R17 is a current-limiting resistor that controls the current flowing to the gate of the third MOS transistor Q3 to prevent excessive current from damaging the third MOS transistor Q3. The eighteenth resistor R18 is a pull-down resistor that pulls the gate voltage of the third MOS transistor Q3 down to ground when the first button S1 is released, ensuring that the third MOS transistor Q3 is quickly turned off. The eleventh resistor R11 is a current-limiting resistor, used for limiting the current passing through the drain to the source of the third MOS transistor Q3 to protect subsequent circuits from overcurrent.

[0056] The technical effect of this embodiment is that: through this design, the circuit realizes reliable switch control. The user controls the on and off of the circuit through the first button. The third MOS tube realizes fast and efficient switching through the change of the gate voltage. At the same time, the eleventh resistor, the seventeenth resistor, and the eighteenth resistor respectively play the role of current limiting and voltage lowering, ensuring stable operation of the circuit.

[0057] As an example, Figure 3As shown, the second switch module 103 is a first MOS transistor Q1, and the LED lamp driving circuit further includes a first resistor R1, a second resistor R2, and a third resistor R3. One end of the first resistor R1 receives a third power supply voltage of 3.3V, and the other end of the first resistor R1 is connected to one end of the LED lamp module 20. The other end of the LED lamp module 20 is connected to the drain of the first MOS transistor Q1. The gate of the first MOS transistor Q1 is connected to one end of the second resistor R2 and one end of the third resistor R3, respectively. The source of the first MOS transistor Q1 and the other end of the third resistor R3 are commonly grounded. The other end of the second resistor R2 is connected to the output end of the control module 104. The LED lamp module 20 includes a first LED lamp LED1, a second LED lamp LED2, a third LED lamp LED3, a fourth LED lamp LED4 and a fifth LED lamp LED5. The anode of the first LED lamp LED1, the anode of the second LED lamp LED2, the anode of the third LED lamp LED3, the anode of the fourth LED lamp LED4 and the anode of the fifth LED lamp LED5 are connected together as one end of the LED lamp module 20, and the cathode of the first LED lamp LED1, the cathode of the second LED lamp LED2, the cathode of the third LED lamp LED3, the cathode of the fourth LED lamp LED4 and the cathode of the fifth LED lamp LED5 are connected together as the other end of the LED lamp module 20.

[0058] The first MOS transistor Q1 acts as a switch module, controlling the on / off state and brightness adjustment of the LED light module 20. The gate voltage is controlled to determine whether the LED light module 20 is on or off, thereby controlling the current flow through the LED light module 20. When the gate voltage of the first MOS transistor Q1 is sufficiently high, the first MOS transistor Q1 conducts, and current flows from the 3.3V voltage through the first resistor R1, the LED light module 20, and the drain of the first MOS transistor Q1 to the source, forming a complete current loop, illuminating the LED light module 20. When the gate voltage of the first MOS transistor Q1 is insufficient, the first MOS transistor Q1 does not conduct, disconnecting the circuit of the LED light module 20 and turning off the LED light module 20. The first resistor R1 is a current-limiting resistor, used to limit the current flowing through the LED light module 20 and prevent damage to the LED light module 20 due to overcurrent. The second resistor R2 acts as a current-limiting resistor, controlling the current flowing to the gate of the first MOS transistor Q1, protecting the control module 104 and the first MOS transistor Q1, and helping to stabilize the gate voltage. The control module 104 outputs a PWM control signal, which regulates the current to the gate of the first MOS transistor Q1 through the second resistor R2, thereby controlling the on and off states of the first MOS transistor Q1. The third resistor R3 is used to bias the source of the first MOS transistor Q1 and stabilize the gate-source voltage difference, ensuring that the first MOS transistor Q1 can operate normally at the appropriate operating point. The third resistor R3 is connected between the source of the first MOS transistor Q1 and ground, forming a bias circuit. This resistor can control the source voltage of the first MOS transistor Q1, thereby adjusting the gate-source voltage difference and ensuring that the first MOS transistor Q1 can stably switch between the on and off states. The control module 104 controls the gate voltage of the first MOS transistor and adjusts the on-time of the MOS transistor by outputting a PWM control signal, thereby controlling the brightness of the LED light module 20. The control module 104 generates a PWM control signal based on input (e.g., key operation) and transmits the signal to the gate of the first MOS transistor Q1 through the second resistor R2. The duty cycle of the PWM control signal determines the on-time of the first MOS transistor Q1, thereby controlling the brightness of the LED light module 20. The higher the duty cycle, the longer the conduction time of the first MOS tube Q1 is, and the higher the brightness of the LED lamp module 20 is; the lower the duty cycle, the shorter the conduction time of the first MOS tube Q1 is, and the lower the brightness of the LED lamp module 20 is.

[0059] The technical effect of this embodiment is that: this circuit solution realizes efficient driving and flexible brightness adjustment of LED lamps through MOS tube control and PWM dimming technology, and has high reliability and power consumption optimization effect.

[0060] Further, such as Figure 4As shown, the LED lamp driving circuit also includes a third switch module 105, a power-on module 106 and a voltage-reduction module 107. The control end of the third switch module 105 is connected to the other end of the button module 101, one end of the third switch module 105 is connected to the control end of the power-on module 106, and the other end of the third switch module 105 is grounded. The input end of the power-on module 106 receives a third power supply voltage, the output end of the power-on module 106 is connected to the input end of the voltage-reduction module 107, and the output end of the voltage-reduction module 107 is connected to the power supply end of the control module 104. When the button module 101 is turned on for the first preset time, the third switch module 105 is turned on and sends a power-on signal to the power-on module 106. The power-on module 106 outputs a first voltage to the voltage-reduction module 107 according to the power-on signal. The voltage-reduction module 107 reduces the first voltage and outputs a second voltage to the control module 104.

[0061] The key module 101 is used for user input to control power-on and brightness adjustment. Key operation controls the device's power-on and brightness adjustment functions. One end of the key module 101 receives a first power supply voltage, and the other end is connected to the control end of the third switch module 105. When the user presses and holds the key for a certain period of time (a first preset time), the key module 101 turns on, transmitting a signal to the control end of the third switch module 105, triggering a power-on signal. The third switch module 105 controls the activation of the power module 106 when the key is pressed. After the key is activated, the third switch module 105 receives the control signal from the key, turns on, and transmits the power-on signal to the power module 106. The power module 106 receives the power-on signal and controls the activation of the power supply. By receiving the power-on signal from the third switch module 105, it controls the power supply to the step-down module 107. When the third switch module 105 turns on and transmits the power-on signal, the power module 106 receives the signal and outputs a first voltage, supplying power to the step-down module 107. The step-down module 107 steps down the first voltage from the power-on module 106 and outputs a second voltage suitable for use by the control module 104. The input of the step-down module 107 receives the first voltage from the power-on module 106 and converts the higher input voltage into an operating voltage suitable for the control module 104 through a step-down circuit. After the voltage reduction is completed, the step-down module 107 outputs the second voltage to the power supply of the control module 104, providing it with a stable power supply. The control module 104 is used to manage the operating state of the entire LED lamp drive circuit, including brightness adjustment and LED lamp control. The control module 104 is powered by the second voltage received from the step-down module 107 and controls the brightness adjustment of the LED lamp module 20 by detecting key signals. In response to the user's key operation, the control module 104 outputs a PWM control signal to the second switch module 103 to achieve brightness adjustment of the LED lamp module 20.

[0062] The technical benefit of this embodiment lies in the fact that this circuit design, through the coordinated operation of multiple modules, implements key control, power-on signal transmission, voltage conversion, and brightness adjustment. The overall circuit structure is simple, providing efficient power management and precise brightness control, while ensuring device stability and user convenience.

[0063] As an example, Figure 5 As shown, the third switch module 105 includes a fourth transistor Q4 and a fourteenth resistor R14, one end of the fourteenth resistor R14 is the control end of the third switch module 105, the other end of the fourteenth resistor R14 is connected to the base of the fourth transistor Q4, the collector of the fourth transistor Q4 is one end of the third switch module 105, and the emitter of the fourth transistor Q4 is the other end of the third switch module 105.

[0064] The fourth transistor Q4 controls the on / off state of the circuit. Its primary function is to control the current flow between the emitter and collector based on the base current, thereby achieving a switching function. When the base receives a signal from the control terminal, the base current triggers the conduction of the fourth transistor Q4, forming a path between the collector and emitter, and the circuit is turned on. When the base current is cut off, the fourth transistor Q4 turns off, disconnecting the path between the collector and emitter, and closing the circuit. The fourteenth resistor R14 acts as a current-limiting resistor to protect the fourth transistor Q4, limiting the current entering the base of the fourth transistor Q4 and preventing damage to the fourth transistor Q4 due to excessive base current.

[0065] Further, such as Figure 5 As shown, the LED lamp driving circuit 10 further includes a fifth MOS transistor Q5, a nineteenth resistor R19, and a twenty-first resistor R21. The drain of the fifth MOS transistor Q5 is connected to the collector of the fourth transistor Q4. The gate of the fifth MOS transistor Q5 is connected to one end of the nineteenth resistor R19 and one end of the twenty-first resistor R21, respectively. The source of the fifth MOS transistor Q5 and the other end of the nineteenth resistor R19 are commonly connected to ground. The other end of the twenty-first resistor R21 serves as a first starting terminal.

[0066] The LED lamp driving circuit 10 further includes a sixth transistor Q6, a sixteenth resistor R16, and a twenty-second resistor R22. The collector of the sixth transistor Q6 is connected to the collector of the fourth transistor Q4. The gate of the sixth transistor Q6 is connected to one end of the sixteenth resistor R16. The other end of the sixteenth resistor R16 and one end of the twenty-second resistor R22 are commonly connected to form a second starting end. The emitter of the sixth transistor Q6 and one end of the twenty-second resistor R22 are commonly connected to ground.

[0067] The fifth MOS transistor Q5 controls the on / off switching of a portion of the circuit. Its gate receives a control signal from the start-up terminal via a nineteenth resistor R19 and a twenty-first resistor R21. When the gate voltage of the fifth MOS transistor Q5 reaches a certain threshold voltage, the fifth MOS transistor Q5 turns on, closing the circuit and allowing current to flow through the drive circuit. When the gate voltage of the fifth MOS transistor Q5 drops below the threshold voltage, the fifth MOS transistor Q5 turns off, disconnecting the circuit. The sixth transistor Q6 controls the flow of another portion of the current, acting as an auxiliary switch. Its gate receives a control signal from the second start-up terminal via a sixteenth resistor R16. When the start signal arrives, the sixth transistor Q6 turns on, forming a conductive path between its collector and emitter, thereby controlling the flow of current. When the start signal is removed, the sixth transistor Q6 turns off, interrupting the current path. The nineteenth resistor R19 provides current limiting protection for the gate of the fifth MOS transistor Q5, preventing excessive current from entering the gate and stabilizing the gate voltage. The twenty-first resistor R21 is connected to the first starting terminal and cooperates with the nineteenth resistor R19 to provide an appropriate control signal to the gate of the fifth MOS transistor Q5. The sixteenth resistor R16 provides current limiting protection for the base of the sixth transistor Q6, preventing excessive current from entering the base while stabilizing the base voltage. The twenty-second resistor R22 connects the emitter of the sixth transistor Q6 to ground, providing a stable reference voltage and current path. The fourth transistor Q4 cooperates with the fifth and sixth MOS transistors Q5 and Q6 to control current flow and achieve multi-level current regulation.

[0068] The technical effect of this embodiment is that: through the cooperation of the fifth MOS tube, the sixth MOS tube and the fourth transistor, multi-level control can be achieved, supporting the control of current flow under different startup conditions and adapting to different operating requirements.

[0069] For the power-on module 106, a variety of implementations can be adopted, including but not limited to: a button switch power-on module, a bistable trigger power-on module, a combination module of a MOS tube and an RC delay circuit, a power management IC power-on module, and a single-chip microcomputer controlled power-on module.

[0070] As an implementation of the startup module 106, Figure 6As shown, the startup module 106 includes a seventh MOS transistor Q7, a twenty-fourth capacitor C24, a twenty-fifth electrolytic capacitor C25, a twenty-sixth capacitor C26, a twenty-sixth resistor R26, and a twenty-seventh resistor R27. One end of the twenty-fourth capacitor C24, one end of the twenty-sixth resistor R26, and the source of the seventh MOS transistor Q7 are connected together and constitute an input end of the startup module 106. The other end of the twenty-sixth resistor R26 and one end of the twenty-seventh resistor R27 are connected together to form a control end of the startup module 106. The gate of the seventh MOS transistor Q7 is connected to the other end of the twenty-seventh resistor R27. The drain of the seventh MOS transistor Q7, the positive electrode of the twenty-fifth electrolytic capacitor C25, and one end of the twenty-sixth capacitor C26 are connected together to form an output end of the startup module 106. The negative electrodes of the twenty-fourth capacitor C24, the twenty-fifth electrolytic capacitor C25, and the other end of the twenty-sixth capacitor C26 are connected together to ground.

[0071] The seventh MOS transistor Q7 is the core switching device of the startup module 106, controlling the on / off switching of the power supply and ensuring that the input voltage is transmitted to the output terminal. When the gate voltage of the seventh MOS transistor Q7 is higher than the threshold voltage, the seventh MOS transistor Q7 is turned on, and the input voltage is transmitted from the source to the drain, ultimately transmitting the voltage to the output terminal of the startup module 106. When the gate voltage of the seventh MOS transistor Q7 is lower than the threshold voltage, the seventh MOS transistor Q7 is turned off, and the circuit is in an open state. The twenty-fourth capacitor C24 is used to filter and stabilize the input voltage, preventing high-frequency interference in the input voltage from affecting the operation of subsequent circuits. The twenty-fifth electrolytic capacitor C25 is used to store energy and smooth the output voltage, ensuring the stability of the voltage output by the startup module 106. The twenty-sixth capacitor C26 works in conjunction with the twenty-fifth electrolytic capacitor C25 to further smooth and filter the output voltage. This capacitor is primarily used to filter out high-frequency noise in the output voltage, further improving voltage stability. This is particularly important during the switching moment of the seventh MOS transistor Q7, preventing high-frequency noise generated by the switching action from affecting the normal operation of subsequent circuits. The twenty-sixth resistor R26 is used to control the gate voltage division and adjust the conduction state of the seventh MOS transistor Q7. The twenty-seventh resistor R27, as part of the voltage division circuit, helps to adjust the gate voltage of the seventh MOS transistor Q7 and prevents the seventh MOS transistor Q7 from being mis-conducted.

[0072] The technical effect of this embodiment is that through the coordinated action of multiple components, stable power management and efficient switch control are provided, ensuring that the LED lamp driving circuit can operate under stable voltage conditions, while preventing the fluctuation of the input voltage from affecting subsequent circuits, thereby enhancing the reliability and stability of the system.

[0073] The buck module 107 may have a variety of different structural designs, including but not limited to: a switch mode buck circuit, a synchronous rectification buck circuit, a multi-phase buck circuit, and a charge pump buck circuit.

[0074] As an example, Figure 7 As shown, the step-down module 107 includes a fourth chip U4, an inductor L, a sixteenth capacitor C16, an eighteenth capacitor C18, a nineteenth capacitor C19, a thirtieth resistor R30, and a thirty-first resistor R31. The first input terminal (pin 1 EN), the second input terminal (pin 4 EN), and one end of the sixteenth capacitor C16 of the fourth chip U4 are commonly connected to the input terminal of the step-down module 107. The output terminal (pin 3 SW) of the fourth chip U4 is connected to one end of the inductor L. The other end of the inductor L, one end of the 30th resistor R30, one end of the eighteenth capacitor C18, and one end of the nineteenth capacitor C19 are commonly connected to the output terminal of the step-down module 107. The feedback terminal (pin 5 FB) of the fourth chip U4 is respectively connected to the other end of the 30th resistor R30, the other end of the eighteenth capacitor C18, and one end of the thirty-first resistor R31. The ground terminal (pin 2 GND) of the fourth chip U4, the other end of the thirty-first resistor R31, and the other end of the nineteenth capacitor C19 are commonly connected to ground.

[0075] Among them, the fourth chip U4 is the core control unit of the step-down module 107, which steps down the input voltage to the target voltage and adjusts the voltage according to feedback. The inductor L is used in the step-down module 107 to store energy and smooth the current, prevent transient changes in the current, and ensure the continuity and stability of the output current. When the output end of the fourth chip U4 outputs current, the inductor L stores energy; when the output end stops outputting current, the inductor L releases energy to maintain the continuity of the current. Through this energy storage and release method, the inductor L achieves a smooth output of the current, prevents large changes in the current, and ensures the stability of the current during the conversion process. The sixteenth capacitor C16 is used to filter out high-frequency noise in the input voltage and stabilize the input voltage. The eighteenth capacitor C18 is used to smooth the output voltage, reduce the voltage ripple at the output end, and ensure the stability of the output voltage. The nineteenth capacitor C19 further stabilizes the output voltage. Similar to the eighteenth capacitor C8, it is mainly used to filter out high-frequency noise at the output end. By being connected in parallel at the output end, it absorbs high-frequency noise signals and further ensures the stability of the output voltage. The 30th resistor R30 and the 31st resistor R31 together form a voltage divider for providing feedback voltage to the feedback terminal of the fourth chip U4 to monitor and adjust the output voltage. By monitoring the feedback voltage, the fourth chip U4 can adjust the output voltage in real time to ensure that the output voltage remains at the set value.

[0076] The technical effect of this embodiment is that: through the combination of the above elements, the buck module can achieve efficient and stable buck power conversion, provide a stable output voltage, and is suitable for various electronic devices that require voltage stabilization.

[0077] like Figure 8As shown in FIG. 1 , a circuit diagram of the control module 104 provided in this embodiment is provided. The control module 104 is a third chip U3. Based on the third chip U3, the working process of the embodiment of the utility model is as follows:

[0078] like Figure 3 、 Figures 5 to 8 As shown, after the VBAT battery is powered, the button S1 is pressed and held for 1.5 seconds, the fourth transistor Q4 obtains a high level and is turned on, Gate_PNP generates a low level to turn on the seventh MOS tube Q7 to output the voltage of V-Bat1, and the voltage of V-Bat1 is used to power the fourth chip U4. The fourth chip U4 is stepped down to 3.3V to power the third chip U3, the first LED lamp LED1, the second LED lamp LED2, the third LED lamp LED3, the fourth LED lamp LED4 and the fifth LED lamp LED5. The second pin of the third chip U3 outputs a high level, and the button S1 is released to start the device.

[0079] In the power-on state, a short press of button S1 for 1 second turns on the third MOS transistor Q3, and the KEY network on pin 1 of the third chip U3 switches from a high level to a low level. Third chip U3 detects the KEY network level to adjust the brightness sequentially from high to low. The software setting for third chip U3's duty cycle is: 1st gear (low) with a 20% duty cycle; 2nd gear (medium) with a 50% duty cycle; 3rd gear (high) with a 50% duty cycle. In the high-level state, the first MOS transistor Q1 turns on, illuminating the first LED LED1, the second LED LED2, the third LED LED3, the fourth LED LED4, and the fifth LED LED5. The first resistor R1 is a current-limiting resistor, set to 150mA for the maximum brightness of the indicator light. A 3.3V power supply, the first resistor R1, the LED module 20, and the first MOS transistor Q1 form a circuit. The switching of the first MOS transistor Q1 uses the entire circuit current and voltage, varying accordingly with the duty cycle. When the PWM control signal's duty cycle is 100%, the current flowing through the LED lamp module 20 is I = 150 × 100% = 150 mA. When the duty cycle is 50%, the current flowing through the LED lamp module 20 is I = 150 × 50% = 75 mA. When the duty cycle is 20%, the current flowing through the LED lamp module 20 is I = 150 × 20% = 30 mA. This configuration allows for precise adjustment of the brightness of the LED lamp module 20.

[0080] Example 2

[0081] The second embodiment provides a light therapy device, including the LED lamp driving circuit and LED lamp module provided in the first embodiment.

[0082] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the scope of protection of the present invention.

Claims

1. A LED lamp driving circuit for a phototherapy device, characterized in that: include: A button module, a first switch module, a second switch module and a control module; One end of the button module receives a first power supply voltage, the other end of the button module is connected to the control end of the first switch module, one end of the first switch module receives a second power supply voltage, the other end of the first switch module is grounded, and the button module is used to control the on / off state of the first switch module; The detection end of the control module is connected to one end of the first switch module, the output end of the control module is connected to the control end of the second switch module, one end of the second switch module is connected to the LED lamp module, and the other end of the second switch module is grounded; The control module detects the on / off state of the first switch module and outputs a PWM control signal to the second switch module.

2. The LED lamp driving circuit according to claim 1, wherein: The second switch module is a first MOS tube, and the LED lamp driving circuit further includes a first resistor, a second resistor and a third resistor; One end of the first resistor receives a third power supply voltage, the other end of the first resistor is connected to one end of the LED lamp module, the other end of the LED lamp module is connected to the drain of the first MOS transistor, the gate of the first MOS transistor is respectively connected to one end of the second resistor and one end of the third resistor, the source of the first MOS transistor and the other end of the third resistor are commonly grounded, and the other end of the second resistor is connected to the output end of the control module.

3. The LED lamp driving circuit according to claim 1, wherein: The LED lamp driving circuit also includes a third switch module, a power-on module and a step-down module. The control end of the third switch module is connected to the other end of the button module, one end of the third switch module is connected to the control end of the power-on module, and the other end of the third switch module is grounded. The input end of the power-on module receives a third power supply voltage, the output end of the power-on module is connected to the input end of the step-down module, and the output end of the step-down module is connected to the power supply end of the control module.

4. The LED lamp driving circuit according to claim 3, wherein: The third switch module includes a fourth transistor and a fourteenth resistor, one end of the fourteenth resistor is the control end of the third switch module, the other end of the fourteenth resistor is connected to the base of the fourth transistor, the collector of the fourth transistor is one end of the third switch module, and the emitter of the fourth transistor is the other end of the third switch module.

5. The LED lamp driving circuit according to claim 4, wherein: The LED lamp driving circuit also includes a fifth MOS transistor, a nineteenth resistor and a twenty-first resistor. The drain of the fifth MOS transistor is connected to the collector of the fourth transistor, the gate of the fifth MOS transistor is respectively connected to one end of the nineteenth resistor and one end of the twenty-first resistor. The source of the fifth MOS transistor and the other end of the nineteenth resistor are commonly connected to ground, and the other end of the twenty-first resistor is a first starting end.

6. The LED lamp driving circuit according to claim 4, wherein: The LED lamp driving circuit also includes a sixth transistor, a sixteenth resistor and a twenty-second resistor. The collector of the sixth transistor is connected to the collector of the fourth transistor, the gate of the sixth transistor is connected to one end of the sixteenth resistor, the other end of the sixteenth resistor and one end of the twenty-second resistor are connected together as a second starting end, and the emitter of the sixth transistor and one end of the twenty-second resistor are connected together to ground.

7. The LED lamp driving circuit according to claim 4, wherein: The startup module includes a seventh MOS transistor, a twenty-fourth capacitor, a twenty-fifth electrolytic capacitor, a twenty-sixth capacitor, a twenty-sixth resistor, and a twenty-seventh resistor. One end of the twenty-fourth capacitor, one end of the twenty-sixth resistor, and the source of the seventh MOS transistor are connected together and constitute the input end of the startup module. The other end of the twenty-sixth resistor and one end of the twenty-seventh resistor are connected together as the control end of the startup module. The gate of the seventh MOS transistor is connected to the other end of the twenty-seventh resistor. The drain of the seventh MOS transistor, the positive electrode of the twenty-fifth electrolytic capacitor, and one end of the twenty-sixth capacitor are connected together as the output end of the startup module. The negative electrodes of the twenty-fourth capacitor, the twenty-fifth electrolytic capacitor, and the other end of the twenty-sixth capacitor are connected to ground.

8. The LED lamp driving circuit according to claim 4, wherein: The step-down module includes a fourth chip, an inductor, a sixteenth capacitor, an eighteenth capacitor, a nineteenth capacitor, a thirtieth resistor and a thirty-first resistor. The first input end, the second input end and one end of the sixteenth capacitor of the fourth chip are commonly connected as the input end of the step-down module. The output end of the fourth chip is connected to one end of the inductor, and the other end of the inductor, one end of the thirtieth resistor, one end of the eighteenth capacitor and one end of the nineteenth capacitor are commonly connected as the output end of the step-down module. The feedback end of the fourth chip is respectively connected to the other end of the thirtieth resistor, the other end of the eighteenth capacitor and one end of the thirty-first resistor. The ground end of the fourth chip, the other end of the thirty-first resistor and the other end of the nineteenth capacitor are commonly connected to the ground.

9. The LED lamp driving circuit according to claim 2, wherein: The LED lamp module includes a first LED lamp, a second LED lamp, a third LED lamp, a fourth LED lamp and a fifth LED lamp. The anode of the first LED lamp, the anode of the second LED lamp, the anode of the third LED lamp, the anode of the fourth LED lamp and the anode of the fifth LED lamp are connected together as one end of the LED lamp module, and the cathode of the first LED lamp, the cathode of the second LED lamp, the cathode of the third LED lamp, the cathode of the fourth LED lamp and the cathode of the fifth LED lamp are connected together as the other end of the LED lamp module.

10. A light therapy device, characterized in that: include: The LED lamp driving circuit and LED lamp module according to any one of claims 1 to 9.

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