Phototherapy device and light performance debugging method thereof

Abstract

The present invention belongs to the field of phototherapy technology, and specifically relates to a phototherapy device and a method for debugging its light performance, comprising a semiconductor light-emitting diode array, a signal circuit, a PWM signal generator, a microprocessor, and a host computer control system; the semiconductor light-emitting diode array is composed of n ultraviolet light-emitting diodes, and its signal input and output are respectively connected to the output and input of the signal circuit; the signal output of the PWM signal generator is connected to the input of the signal circuit, and the signal input is connected to the microprocessor; the microprocessor is connected to the UART serial port of the host computer control system via the RX / TX port; the signal circuit is used to perform wave stabilization processing on the signal provided by the PWM signal generator. The present invention realizes a dual mode of macro-unified regulation and micro-independent regulation of irradiation intensity through the coordinated control of the semiconductor light-emitting diode array and the microprocessor, combined with the wave stabilization processing of the PWM signal generator and the signal circuit.

Description

Technical Field

[0001] The present invention belongs to the technical field of phototherapy, and in particular relates to a phototherapy device and a method for debugging the optical performance thereof. Background Art

[0002] With the widespread application of phototherapy technology in areas such as dermatology, wound healing, and photodynamic therapy, semiconductor light-emitting diodes (LEDs) are gradually replacing traditional light sources as a core component of phototherapy devices due to their advantages, such as wavelength control, low energy consumption, and long life. Existing phototherapy devices based on LED arrays often use a unified drive mode, achieving macroscopic control of irradiation intensity by adjusting the overall current or duty cycle. However, these devices suffer from the following significant drawbacks: Inadequate control precision: Traditional solutions struggle to balance overall intensity regulation with independent control of localized areas, resulting in poor irradiation uniformity across the treatment area. Especially in scenarios requiring differentiated dose delivery (such as complex wound treatment), the inability to micro-adjust specific areas compromises efficacy and may cause side effects. Signal stability issues: PWM (pulse-width modulation) signals are susceptible to high-frequency noise during transmission, causing fluctuations in the LED drive current and drift in irradiation intensity. Existing signal circuits lack effective wave stabilization mechanisms, and long-term use can accelerate LED aging. Weak real-time monitoring capabilities: Most devices lack dynamic monitoring of the operating status of individual LEDs and rely solely on pre-set programs. Once an LED fails or current anomalies occur, it's difficult to locate the fault point in a timely manner, posing a safety hazard. While some solutions incorporate current detection, they lack intelligent alarm modules, making it impossible to proactively respond to abnormal conditions. Rigid communication protocols: Existing devices often use fixed command formats for control, resulting in poor scalability of command fields. This makes it difficult to support the coordinated operation of macro-unified regulation and micro-independent regulation, limiting the implementation of multimodal treatment strategies. Summary of the Invention

[0003] In response to the technical problems existing in the above-mentioned prior art light therapy devices based on LED arrays, the present invention provides a light therapy device and a method for debugging its light performance.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] A phototherapy device comprises a semiconductor light-emitting diode array, a signal circuit, a PWM signal generator, a microprocessor, and a host computer control system; the semiconductor light-emitting diode array is composed of n ultraviolet light-emitting diodes, each ultraviolet light-emitting diode is numbered in sequence from A1 to An, and its signal input and output are respectively connected to the output and input of the signal circuit; the signal output of the PWM signal generator is connected to the input of the signal circuit, and the signal input is connected to the microprocessor; the microprocessor is connected to the UART serial port of the host computer control system via the RX / TX port, and a preset signal communication protocol is matched between the two; the signal circuit is used to perform wave stabilization processing on the signal provided by the PWM signal generator and transmit the processed signal to the semiconductor light-emitting diode array.

[0006] It also includes a potential signal monitoring module for real-time collection of current signals from each ultraviolet light-emitting diode, and converting the analog signal into a digital signal through an A / D conversion circuit and transmitting it to a microprocessor; the microprocessor is configured to perform macro-uniform adjustment and / or micro-independent adjustment of the irradiation intensity of the semiconductor light-emitting diode array according to the data frame sent by the host computer control system.

[0007] The potential signal monitoring module further includes a buzzer module and a voice module. The microprocessor triggers the buzzer module or the voice module to send an alarm signal according to the current acquisition result.

[0008] The signal communication protocol is a custom data frame format based on the UART serial port, and the data frame content includes: semiconductor light-emitting diode array number, ultraviolet light-emitting diode common deployment status identifier, single ultraviolet light-emitting diode number and its corresponding irradiation intensity output digital signal quantity.

[0009] The macro-uniform adjustment is to adjust the irradiation intensity of the entire semiconductor light emitting diode array as a whole, and the micro-independent adjustment is to individually control the irradiation intensity within the area where the i-th semiconductor light emitting diode is located.

[0010] A method for debugging the light performance of a phototherapy device comprises the following steps:

[0011] Step 1: numbering n ultraviolet light emitting diodes in the semiconductor light emitting diode array in order from A1 to An;

[0012] Step 2: Collect the real-time irradiance intensity of each UV LED, calculate the irradiance consistency and uniformity of the device's light-emitting surface, calculate the quotient of the sum of the irradiance intensities of n UV LEDs and n to obtain the average irradiance intensity of the device's light-emitting surface, then calculate the difference between the irradiance intensities of the n UV LEDs and the average value, and finally calculate the quotient of the difference and the average value, and adjust the output of each diode based on the quotient value;

[0013] Step 3: Send a data frame containing control instructions to the microprocessor through the host computer control system to verify the validity of the signal communication protocol and generate corresponding potential signals and digital signals;

[0014] Step 4: The PWM signal generator modulates the received digital signal into a PWM signal;

[0015] Step 5: The signal circuit stabilizes the PWM signal and transmits the stabilized signal to the semiconductor light emitting diode array to complete the irradiation intensity control.

[0016] The collection of the irradiation intensity in step 2 is achieved through the potential signal monitoring module and the A / D conversion circuit, and the microprocessor triggers the buzzer module or the voice module to prompt an abnormal state according to the collection result.

[0017] The data frame in step three includes the following fields: target ultraviolet light-emitting diode number; irradiation intensity control mode identifier; and digital signal quantity corresponding to the target irradiation intensity.

[0018] The stabilization process in step five includes eliminating high-frequency noise in the PWM signal and distributing the stabilized signal to the UV light-emitting diodes with designated numbers through the signal circuit.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. This invention achieves dual modes of macro-uniform and micro-independent regulation of irradiation intensity through the coordinated control of a semiconductor light-emitting diode array and a microprocessor, combined with wave stabilization processing by a PWM signal generator and signal circuit. This not only meets the overall energy demand of the treatment area, but also enables precise regulation of localized lesions. Real-time current signal acquisition through a potential signal monitoring module, combined with A / D conversion and dynamic analysis by the microprocessor, can quickly identify abnormal current fluctuations and trigger a buzzer or voice alarm module, significantly improving the safety of device operation.

[0021] 2. This invention uses a custom data frame protocol based on the UART serial port. By encoding fields such as the target diode number, control mode identifier, and digital signal quantity, it achieves efficient command exchange between the host computer and the microprocessor. This protocol supports seamless switching between batch control and single-point independent control, adapting to the diverse needs of different clinical scenarios, while also reducing communication bit error rates and enhancing system stability.

[0022] 3. This invention automatically adjusts the output intensity of each diode by calculating irradiation consistency and uniformity in the optical performance debugging method, ensuring uniform energy distribution across the treatment area. Wave stabilization technology effectively eliminates high-frequency noise in the PWM signal. Combined with the dynamic allocation function of the signal circuit, it suppresses irradiation fluctuations caused by component aging or environmental interference, extending the effective service life of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely exemplary, and those skilled in the art can, without inventive effort, derive other implementation drawings based on the provided drawings.

[0024] The structures, proportions, sizes, etc. illustrated in this specification are intended solely to complement the contents disclosed herein and to facilitate understanding and reading by persons skilled in the art. They are not intended to limit the conditions under which the present invention may be implemented and therefore have no substantive technical significance. Any structural modifications, changes in proportions, or adjustments in sizes, without affecting the efficacy and objectives of the present invention, shall remain within the scope of the technical contents disclosed herein.

[0025] Figure 1 It is a connection block diagram of the present invention;

[0026] Figure 2 It is a flow chart of the steps of the present invention.

[0027] Among them: 1 is a semiconductor light emitting diode array, 2 is a signal circuit, 3 is a PWM signal generator, 4 is a microprocessor, 5 is a host computer control system, 6 is a potential signal monitoring module, and 7 is an A / D conversion circuit. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of this application, not all the embodiments. These descriptions are only to further illustrate the features and advantages of the present invention, rather than to limit the claims of the present invention. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0029] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following embodiments are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0030] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0031] Example 1

[0032] This embodiment provides a light therapy device, such as Figure 1 As shown, it includes the following core components and their connection relationships:

[0033] Semiconductor LED array 1 consists of n ultraviolet light-emitting diodes, arranged in a rectangular matrix from A1 to An. The array's signal input is connected to the output of signal circuit 2, which in turn is connected to the input of signal circuit 2 via a feedback circuit, forming a closed-loop control system. Each diode operates with a current range of 10-50mA and a wavelength range of 365-405nm, making it suitable for skin phototherapy applications.

[0034] The signal circuit 2 is used to stabilize the pulse signal output by the PWM signal generator 3. Specifically, it eliminates high-frequency noise > 10kHz through a low-pass filter and distributes the stabilized signal to the designated number of ultraviolet light-emitting diodes.

[0035] PWM signal generator 3 uses an STM32F103 chip. Its signal output is connected to the input of signal circuit 2, and its input is connected to microprocessor 4 via an SPI interface. PWM signal generator 3 supports 0-100% duty cycle adjustment and a frequency range of 1kHz-20kHz. It is used to modulate the digital signal sent by microprocessor 4 into a PWM waveform.

[0036] Microprocessor 4, an ARM Cortex-M4 core MCU, connects to the UART serial port of the host control system 5 via its RX / TX pins. Microprocessor 4 includes a built-in custom protocol parser module that identifies the data frame sent by the host computer, which contains the "array number + control mode + target semaphore" and generates corresponding control instructions based on the frame content.

[0037] The host control system 5 is based on LabVIEW-based control software. The interface includes a slider for adjusting overall brightness and independent control panels for individual diodes. Users can choose between "macro mode," where a slider adjusts the irradiation intensity of the entire array, or "micro mode," where a specific diode in the matrix diagram is clicked to set its individual output intensity.

[0038] The potential signal monitoring module 6 includes a high-precision current sensor that collects the current signal of each diode in real time. The collected analog signal is converted to a digital signal by the A / D conversion circuit 7 and transmitted to the microprocessor 4. When the current of a diode is detected to exceed the threshold, the microprocessor 4 triggers the buzzer module to issue a continuous buzzing alarm or broadcast an alarm through the voice module.

[0039] Example 2

[0040] This embodiment provides a method for debugging the optical performance of a phototherapy device, such as Figure 2 As shown, the following steps are included:

[0041] The semiconductor light emitting diode array 1 of the phototherapy device is numbered, and the ultraviolet light emitting diodes in the array are also numbered. The n semiconductor light emitting diode arrays are numbered in the order 1, 2...i...n; the ultraviolet light emitting diodes in the array are numbered in the order A1, A2...Ai...An; and the numbering information is stored in the microprocessor 4.

[0042] The UV radiation intensity of each UV LED is collected, and the consistency and uniformity of the collected data on the light-emitting surface of the phototherapy device are calculated. A high-precision current sensor is used to collect the UV radiation intensity signals of n UV LEDs. The collected signals are converted into digital signals by A / D conversion circuit 7 and sent to microprocessor 4.

[0043] The microprocessor 4 calculates the irradiation intensity of the surface of n ultraviolet light emitting diodes and obtains the consistency and uniformity index of the collected data of the light emitting surface. The index value is considered uniform if it is within ±10% of the nominal value.

[0044] The microprocessor 4 and the host control system 5 verify the signal communication protocol. The host control system 5 sends a data frame to the microprocessor 4, forming a potential signal and a digital signal. The frame data sent by the host control system 5 includes the numbers of the n semiconductor light-emitting diode arrays, the collective allocation status of the ultraviolet light-emitting diodes, the number of the ultraviolet light-emitting diodes, and the digital signal output of their irradiance intensity. The data frame format is: STX + array number + status identifier + light-emitting diode number + irradiance intensity digital value + ETX. The PWM signal generator 3 modulates the received digital signal into a PWM signal. The signal circuit 2 stabilizes the signal provided by the PWM signal generator 3 and sends the signal to the semiconductor light-emitting diode array. The signal circuit 2 is an RC filter circuit.

[0045] The microprocessor 4 adjusts the irradiation intensity within the area of ​​the i-th semiconductor light emitting diode array uniformly at the macro level and independently at the micro level within each area based on the consistency and uniformity indicators. The uniform adjustment range is ±10% and the independent adjustment range is ±8%.

[0046] The microprocessor 4 sends the radiation intensity adjustment information to the buzzer module and the voice module, and responds to the radiation intensity status of the ultraviolet light emitting diode by means of buzzer and voice prompts.

[0047] The above only describes in detail the preferred embodiments of the present invention, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in this field without departing from the purpose of the present invention, and various changes should be included in the scope of protection of the present invention.

Claims

1. A phototherapy device, characterized in that: The invention comprises a semiconductor light emitting diode array (1), a signal circuit (2), a PWM signal generator (3), a microprocessor (4) and a host computer control system (5); the semiconductor light emitting diode array (1) is composed of n ultraviolet light emitting diodes, each ultraviolet light emitting diode is numbered in sequence from A1 to An, and its signal input end and output end are respectively connected to the output end and input end of the signal circuit (2); the signal output end of the PWM signal generator (3) is connected to the input end of the signal circuit (2), and the signal input end is connected to the microprocessor (4); the microprocessor (4) is connected to the UART serial port of the host computer control system (5) through the RX / TX port, and the two match a preset signal communication protocol; the signal circuit (2) is used to perform wave stabilization processing on the signal provided by the PWM signal generator (3), and transmit the processed signal to the semiconductor light emitting diode array (1); The light performance debugging method of the phototherapy device comprises the following steps: Step 1: numbering n ultraviolet light emitting diodes in the semiconductor light emitting diode array (1) in order from A1 to An; Step 2: Collect the real-time irradiance intensity of each UV LED, calculate the irradiance consistency and uniformity of the device's light-emitting surface, calculate the quotient of the sum of the irradiance intensities of n UV LEDs and n, and adjust the output of each diode based on the quotient value; Step 3: Sending a data frame containing a control instruction to the microprocessor (4) through the host computer control system (5), verifying the validity of the signal communication protocol, and generating a corresponding potential signal and digital signal; the data frame includes the following fields: the target ultraviolet light emitting diode number; the irradiation intensity control mode identifier; the digital signal quantity corresponding to the target irradiation intensity; Step 4: The PWM signal generator (3) modulates the received digital signal into a PWM signal; Step 5: The signal circuit (2) performs wave stabilization processing on the PWM signal and transmits the stabilized signal to the semiconductor light emitting diode array (1) to complete the irradiation intensity control.

2. A phototherapy device according to claim 1, characterized in that: The system further comprises a potential signal monitoring module (6) for collecting the current signal of each ultraviolet light emitting diode in real time, and converting the analog signal into a digital signal through an A / D conversion circuit (7) and transmitting the digital signal to the microprocessor (4); the microprocessor (4) is configured to perform macro-uniform adjustment and / or micro-independent adjustment of the irradiation intensity of the semiconductor light emitting diode array (1) according to the data frame sent by the host computer control system (5).

3. A phototherapy device according to claim 2, characterized in that: The potential signal monitoring module (6) further comprises a buzzer module and a voice module, and the microprocessor (4) triggers the buzzer module or the voice module to issue an alarm signal according to the current acquisition result.

4. The phototherapy device according to claim 1, wherein: The signal communication protocol is a custom data frame format based on a UART serial port, and the data frame content includes: the semiconductor light emitting diode array (1) number, the ultraviolet light emitting diode common deployment state identifier, the single ultraviolet light emitting diode number and its corresponding irradiation intensity output digital signal quantity.

5. The phototherapy device according to claim 2, wherein: The macro-uniform adjustment is to adjust the irradiation intensity of the entire semiconductor light emitting diode array (1) as a whole, and the micro-independent adjustment is to individually control the irradiation intensity within the area where the i-th semiconductor light emitting diode is located.

6. The phototherapy device according to claim 1, characterized in that: The collection of the irradiation intensity in step 2 is achieved through the potential signal monitoring module (6) and the A / D conversion circuit (7), and the microprocessor (4) triggers the buzzer module or the voice module to provide an abnormal state prompt based on the collection result.

7. The phototherapy device according to claim 1, wherein: The stabilization process in step 5 includes eliminating high-frequency noise in the PWM signal and distributing the stabilized signal to the UV light-emitting diodes with designated numbers through the signal circuit (2).

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