Infrared light power control circuit and near-infrared light therapy device

Abstract

The utility model provides an infrared light power control circuit and a near-infrared light therapy device. The infrared light power control circuit comprises a master controller, an LED module, a distance detection module and a power supply module. The LED module comprises a driving assembly and LED lamp beads connected with the driving assembly, the driving assembly is connected with the main controller, and the main controller controls the driving assembly to control the LED lamp beads to be turned on and turned off. The distance detection module is connected with the main controller and used for detecting a distance signal between the LED lamp bead and a human body, and the main controller controls the driving assembly to be switched on or switched off according to the distance signal. The power supply module is connected with an external power supply and outputs a plurality of power supplies with different voltages, and the master controller, the LED module and the distance detection module are all connected with the power supply module. A distance signal between a human body and a product is detected in real time through the distance detection module, and the master controller controls the on-off of the LED lamp beads according to the distance signal, namely, the working time of the LED lamp beads is controlled, so that the purpose that the human body receives quantitative infrared radiation energy every day is achieved.

Description

Technical Field

[0001] This utility model relates to the field of infrared light source power control technology, and in particular to an infrared light power control circuit and a near-infrared phototherapy device. Background Technology

[0002] In modern society, with the acceleration of urbanization and the transformation of work patterns, office workers have become the main group who spend long hours sitting indoors. Numerous studies have shown that prolonged exposure to indoor environments, with a severe lack of natural light, has many negative effects on human health. Lack of sunlight can hinder the body's normal synthesis of vitamin D, thus affecting bone health; at the same time, it disrupts the biological clock, leading to decreased sleep quality and increased fatigue.

[0003] Studies have found that near-infrared light can effectively compensate for the lack of natural indoor lighting, and infrared light therapy products have appeared on the market one after another, allowing people to enjoy health benefits similar to those brought by natural sunlight.

[0004] However, most existing infrared light therapy products on the market use a timer function to control the light exposure time, but they cannot adjust the light exposure time according to the distance between the human body and the product, and cannot effectively control the light radiation energy received by the human body. Utility Model Content

[0005] To address the aforementioned issues, the purpose of this invention is to provide a circuit for controlling the power of infrared light and a near-infrared phototherapy device. By controlling the output pulse current of the infrared lamp, the infrared lamp can instantly output a large power to achieve a deep skin-care effect on the face. Simultaneously, a distance sensor detects the distance between the human body and the product, and the MCU controls the working time of the output infrared lamp to achieve a fixed daily dosage.

[0006] This utility model is achieved through the following technical solution:

[0007] An infrared light power control circuit includes:

[0008] Main controller;

[0009] The LED module includes a driver component and LED beads connected to the driver component, and the driver component is connected to the main controller.

[0010] A distance detection module is connected to the main controller and is used to detect the distance signal between the LED beads and the human body.

[0011] The power module is connected to an external power source and outputs several power supplies with different voltages. The main controller, LED module and distance detection module are all connected to the power module, which supplies them with power.

[0012] The main controller is used to control the conduction or cutoff of the driving component according to the distance signal, thereby controlling the on / off state of the LED light.

[0013] Furthermore, the power module includes a power interface, a boost power chip connected to the power interface, and a freewheeling inductor connected between the input terminal and the switching terminal of the boost power chip; wherein, the switching terminal of the boost power chip has a built-in switching transistor.

[0014] Furthermore, the driving component includes a driving chip, the power supply terminal of which is connected to the switching terminal of the boost power chip, and the control pin of which is connected to the main controller; the switching pin of which is connected to the LED bead.

[0015] The main controller controls the driver chip via a PWM signal; the driver chip has a built-in switching transistor on its switching pin.

[0016] Furthermore, the switching pin of the driver chip is connected between the power supply terminal of the driver chip and the positive terminal of the LED bead through a Zener diode; the Zener diode and the common terminal of the driver chip are connected in series with a second inductor and then connected to the negative terminal of the LED bead;

[0017] The anode of the Zener diode is connected to the switching pin of the driver chip.

[0018] Furthermore, at least one detection resistor is connected in series between the second inductor and the LED bead, and the two ends of the detection resistor are respectively connected to the two detection pins of the driver chip.

[0019] Furthermore, the detection resistor is an alloy foil resistor.

[0020] Furthermore, the infrared light power control circuit also includes a capacitor bank, which consists of several capacitors connected in parallel. One end of each capacitor is connected between the switching terminal of the boost power chip and the power supply terminal of the driver chip, and the other end is grounded.

[0021] Furthermore, the distance detection module includes a laser module that can emit laser pulses and detect the returning light waves.

[0022] Furthermore, the infrared optical power control circuit also includes a feedback component, which includes a first resistor and a fifth resistor connected in series. The other end of the first resistor is connected to the output terminal of the boost power chip, and the other end of the fifth resistor is grounded. The feedback pin of the boost power chip is connected between the first resistor and the fifth resistor.

[0023] A near-infrared phototherapy device includes the aforementioned infrared light power control circuit.

[0024] Compared with the prior art, the technical solution of this utility model and its beneficial effects are as follows:

[0025] (1) The infrared light power control circuit of this utility model detects the distance signal between the human body and the product in real time through the distance detection module. The main controller controls the on / off state of the LED beads according to the distance signal, that is, controls the working time of the LED beads, so as to achieve the purpose of the human body receiving a certain amount of infrared light radiation energy every day. Moreover, the distance signal-based control method is more flexible than the traditional timed control, and can better adapt to different usage scenarios and user needs, providing users with a more personalized lighting experience.

[0026] (2) The infrared light power control circuit of this utility model can generate a square wave current of about 2.7A by combining the boost circuit formed by the boost power chip and its peripheral circuit with the buck circuit formed by the peripheral circuit of the drive chip. The main controller PWM controls the switching of the drive component, so that the instantaneous power of the LED lamp bead can reach about 30W when it is turned on. When the product is working, the near-infrared light can effectively reach the deep skin of the face, so that the product can achieve the ideal phototherapy effect. Attached Figure Description

[0027] Figure 1 This is a block diagram of the infrared light power control circuit provided in this embodiment of the utility model;

[0028] Figure 2 This is a partial schematic diagram of the power module provided in an embodiment of this utility model;

[0029] Figure 3 This is another part of the schematic diagram of the power module provided in this embodiment of the utility model;

[0030] Figure 4 This is a schematic diagram of the LED module provided in this embodiment of the utility model;

[0031] Figure 5 This is a schematic diagram of the distance detection module provided in this embodiment of the utility model;

[0032] Figure 6 This is a partial schematic diagram (control chip) of the main controller provided in this embodiment of the utility model;

[0033] Figure 7 This is another part of the schematic diagram (clock) of the main controller provided in this embodiment of the utility model;

[0034] Figure 8 This is another part of the schematic diagram of the main controller (ambient light sensor) provided in this embodiment of the utility model. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0036] See Figure 1 An infrared light power control circuit includes a main controller, an LED module, a distance detection module, and a power supply module. The LED module includes a driver component and LED beads connected to the driver component. The driver component is connected to the main controller, which controls the driver component and thus the LED beads to turn on and off. The distance detection module is connected to the main controller and is used to detect the distance signal between the LED beads and a human body. The main controller controls the driving component to turn on or off based on the distance signal. The power supply module is connected to an external power supply and outputs several power supplies of different voltages. The main controller, LED module, and distance detection module are all connected to the power supply module, which supplies power to them. In this embodiment, the power supply module is connected to an external 5V power supply and outputs 16.6V and 3.3V power supplies.

[0037] The distance detection module monitors the distance between the human body and the product in real time (radiation levels vary at different distances). The main controller then controls the LED lights to turn on and off based on these distance signals, thus controlling the LED lights' operating time and ensuring that the human body receives a fixed amount of infrared radiation energy daily. Furthermore, this distance-based control method is more flexible than traditional timed control, better adapting to different usage scenarios and user needs, and providing a more personalized lighting experience.

[0038] See Figure 2The power module includes a power interface CM1, a boost power chip U1 connected to the power interface CM1, and a freewheeling inductor L1 connected between the input terminal IN and the switching terminal LX of the boost power chip U1. Specifically, in this embodiment, the boost power chip U1 uses a SY7208CABC and is powered by a 5V input voltage via USB. The switching terminal LX of the boost power chip U1 has a built-in MOS switch. When the switch is turned on, it is equivalent to grounding, and the 5V input voltage flows through the freewheeling inductor L1, which stores energy. The current increases over time, and the voltage across the freewheeling inductor L1 equals 5V. When the MOS switch in the switching terminal LX is turned off, the freewheeling inductor L1 continues to flow current, which flows through diode D1 to the subsequent structure. At this time, the freewheeling inductor L1 is releasing energy. When the built-in MOS switch in the switching terminal LX is turned off, the reverse electromotive force generated by the freewheeling inductor L1 will make the output voltage (Vout) higher than the input voltage (Vin = 5V), thereby achieving boosting.

[0039] The feedback pin FB of the boost power supply chip U1 is also connected to a feedback component, which includes a first resistor R1 and a fifth resistor R5 connected in series. The other end of the first resistor R1 is connected to the output terminal of the boost power supply chip U1 (i.e., the cathode of diode D1), and the other end of the fifth resistor R5 is grounded. The feedback pin FB of the boost power supply chip is connected between the first resistor R1 and the fifth resistor R5. The output voltage (Vout) is determined by the ratio of the first resistor R1 to the fifth resistor R5. The reference voltage of the feedback pin FB of the boost power supply chip U1 is 0.6V. In this embodiment, the resistance of the first resistor R1 is 200kΩ, the resistance of the fifth resistor R5 is 7.5KΩ, and Vout = 0.6 * (1 + R1 / R5). The output voltage Vout can be calculated to be 16.6V.

[0040] Of course, the power module also includes other power chips, such as Figure 3 As shown, it also includes a step-down power supply chip U5, which adjusts the 5V input voltage to 3.3V to power the main controller and other modules.

[0041] See Figure 4 The driving component includes a driver chip U2. The power supply terminal VIN of driver chip U2 is connected to the switching terminal LX of boost power chip U1. The control pin EN / PWM of driver chip U2 is connected to the main controller, which controls driver chip U2 via a PWM signal. The switching pin SW of driver chip U2 is connected to the LED beads. The main controller, by controlling driver chip U2 via a PWM signal, can precisely adjust the switching frequency and duty cycle of driver chip U2, thereby achieving precise control of the LED bead power.

[0042] The switching pin SW of the driver chip U2 is connected between the power supply terminal VIN of the driver chip U2 and the positive terminal VLED+ of the LED bead through a Zener diode D3. The anode of the Zener diode D3 is connected to the switching pin SW of the driver chip U2. The Zener diode D3 and the common terminal of the driver chip U2 are connected in series with the second inductor L2 and then connected to the negative terminal VLED- of the LED bead.

[0043] The SW pin of the driver chip U2 houses a MOSFET. When the MOSFET is turned on, it's equivalent to a short circuit to ground, the Zener diode D3 is off, and current flows through the second inductor L2. As the inductor current increases linearly, self-induction occurs, which impedes the current increase, storing energy in the second inductor L2. When the MOSFET is turned off, no current flows to the second inductor L2, but the inductor current doesn't suddenly drop to zero; instead, it gradually decreases, generating a self-induced electromotive force (EMF) with positive on the left and negative on the right. This causes D2 to conduct, converting the stored magnetic energy in L2 into electrical energy, which then drives the LED chips.

[0044] At least one sensing resistor is connected in series between the second inductor L2 and the LED. In this embodiment, gold foil resistors R2 and R4 are connected in series between the second inductor L2 and the LED. The other end of the gold foil resistor R2 is connected to the first comparator pin SCN of the driver chip U2, and the other end of the gold foil resistor R4 is connected to the second comparator pin SCP of the driver chip U2. The first comparator pin SCN and the second comparator pin SCP of the driver chip U2 are used to detect the LED current. When current flows through the gold foil resistors R2 and R4, a voltage is generated. The reference voltage of the second comparator pin SCP and the first comparator pin SCN of the driver chip U2 is 200mV. In this embodiment, the total resistance of the gold foil resistors R2 and R4 is 73mΩ, and the output current is controlled to a maximum of 2.73A.

[0045] The boost circuit formed by the boost power chip U1 and its peripheral circuits, combined with the buck circuit formed by the driver chip U2 and its peripheral circuits, can generate a square wave current of approximately 2.7A. The main controller controls the switching of the drive components, with a 100Hz duty cycle and a 10% switching signal. The rise and fall times are controlled within 100µs, enabling the LED beads to achieve an instantaneous power of about 30W and a light intensity of 7.5mW / cm2 when turned on. When the product is working, the near-infrared light can effectively reach the deep layers of the skin on the face, achieving the ideal phototherapy effect.

[0046] It also includes a capacitor bank, which consists of several capacitors connected in parallel. One end of each capacitor is connected between the switching terminal LX of the boost power chip U1 and the power supply terminal VIN of the driver chip U2, while the other end is grounded. The capacitor bank filters the voltage output from the boost power chip U1, reducing ripple and noise, and providing a more stable power supply voltage to the driver chip and LED beads. Simultaneously, the capacitors also act as energy storage in the circuit, releasing electrical energy when needed to help the power module better meet the instantaneous power requirements of the circuit.

[0047] See Figure 5 The distance detection module includes a laser module that emits laser pulses and detects the returning light waves. In this embodiment, the laser module uses a VL53L0CXV0DH / 1, which emits a 940nm laser pulse through a built-in laser diode. The laser pulse travels through the air at the speed of light, and when it encounters a human body, some of the light is reflected back. The detector inside the sensor detects the returned light wave, and the time interval from emitting the laser pulse to receiving the echo is precisely measured. This time interval is typically very short, measured in nanoseconds (ns). Since the speed of light is known, the distance between the human body and the sensor is calculated using the formula "distance = speed of light × time of flight ÷ 2". The module incorporates ST's second-generation FlightSense patented technology, which processes and optimizes the measurement data through advanced algorithms, such as noise removal and error correction, to improve measurement accuracy. The laser module U4 has a measurement range of 2 centimeters to 2 meters, enabling real-time detection of the distance between the product and the human body. It is understandable that the laser module can be positioned in the middle or near the LED beads, so that the distance detected by the laser module is the distance between the LED beads and the human body; alternatively, the laser module and the LED beads can be oriented in the same direction, and the difference in distance between the two and the human body is fixed, thus indirectly obtaining the distance between the LED beads and the human body.

[0048] See Figures 6 to 8 The main controller in this embodiment includes a control chip U3, a real-time clock component connected to the control chip U3, and an ambient light sensor connected to the control chip U3. The configuration of the control chip U3 and its peripheral circuits ensures the accuracy of the control chip U3's control over the driver chip U2.

[0049] This embodiment also provides a near-infrared phototherapy device, including the aforementioned infrared light power control circuit.

[0050] The foregoing description illustrates and describes preferred embodiments of the present invention. It should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the present invention through the foregoing teachings or related technical or knowledge. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. An infrared optical power control circuit, characterized in that, include: Main controller; The LED module includes a driver component and LED beads connected to the driver component, and the driver component is connected to the main controller. A distance detection module is connected to the main controller and is used to detect the distance signal between the LED beads and the human body. The power module is connected to an external power source and outputs several power supplies with different voltages. The main controller, LED module and distance detection module are respectively connected to the corresponding power supply output terminals of the power module, and the power module supplies them with power. The main controller is used to control the conduction or cutoff of the driving component according to the distance signal, thereby controlling the on / off state of the LED light.

2. The infrared optical power control circuit according to claim 1, characterized in that, The power module includes a power interface, a boost power chip connected to the power interface, and a freewheeling inductor connected between the input terminal and the switching terminal of the boost power chip; wherein, the switching terminal of the boost power chip has a built-in switching transistor.

3. The infrared optical power control circuit according to claim 2, characterized in that, The driving component includes a driving chip, the power supply terminal of which is connected to the switching terminal of the boost power chip, and the control pin of which is connected to the main controller; the switching pin of which is connected to the LED bead. The main controller controls the driver chip via a PWM signal; the driver chip has a built-in switching transistor on its switching pin.

4. The infrared optical power control circuit according to claim 3, characterized in that, The switching pin of the driver chip is connected between the power supply terminal of the driver chip and the positive terminal of the LED bead through a Zener diode; the Zener diode and the common terminal of the driver chip are connected in series with a second inductor and then connected to the negative terminal of the LED bead. The anode of the Zener diode is connected to the switching pin of the driver chip.

5. The infrared optical power control circuit according to claim 4, characterized in that, At least one detection resistor is connected in series between the second inductor and the LED bead, and the two ends of the detection resistor are respectively connected to the two detection pins of the driver chip.

6. The infrared optical power control circuit according to claim 5, characterized in that, The detection resistor is an alloy foil resistor.

7. The infrared optical power control circuit according to claim 3, characterized in that, It also includes a capacitor bank, which consists of several capacitors connected in parallel. One end of each capacitor is connected between the switching terminal of the boost power supply chip and the power supply terminal of the driver chip, and the other end is grounded.

8. The infrared optical power control circuit according to claim 1, characterized in that, The distance detection module includes a laser module, which is capable of emitting laser pulses and detecting the returning light waves.

9. An infrared optical power control circuit according to claim 2, characterized in that, It also includes a feedback component, which includes a first resistor and a fifth resistor connected in series. The other end of the first resistor is connected to the output terminal of the boost power chip, and the other end of the fifth resistor is grounded. The feedback pin of the boost power chip is connected between the first resistor and the fifth resistor.

10. A near-infrared phototherapy device, characterized in that, It includes the infrared light power control circuit as described in any one of claims 1 to 9.

Images