Light emitting diode control method, system, medical device and storage medium

Abstract

The present invention discloses a control method, system, medical equipment and storage medium for light-emitting diodes, wherein a first temperature value and a first pressure difference value of a light-emitting diode are obtained, and a pre-stored first calibration data table is called for a first comparison based on the first temperature value and the first pressure difference value. After the first pressure difference value is calibrated based on the result of the first comparison, a second pressure difference value is obtained, and the first calibration data table is a statistical table of the initial temperature value and the initial voltage value of the light-emitting diode; a current value of the light-emitting diode is obtained, and a second comparison is called for a pre-stored second calibration data table based on the second pressure difference value and the current value. The second calibration data table is a statistical table of the initial pressure difference value and the initial current value of the light-emitting diode. If the result of the second comparison does not meet a preset threshold, an alarm message is sent, thereby solving the problem that the service life of a single LED lamp cannot be accurately predicted and realizing accurate prediction and alarm of the service life of a single LED lamp.

Description

Technical Field

[0001] The present invention relates to the field of light emitting diodes, and in particular to a control method, system, medical equipment and storage medium for light emitting diodes. Background Art

[0002] In related technologies, medical devices with imaging functions mainly include a front-end image acquisition device, a back-end host and a cold light source. Among them, the front-end image acquisition device and the back-end host are mainly responsible for image acquisition and transmission, and the cold light source is responsible for providing a qualified light source. The quality of the image is directly related to the working state of the cold light source, and the core component of the cold light source is the LED lamp. The lifespan of LED products on the market is usually nominally 30,000-60,000 hours, but after a certain period of use, the LED lamp will experience adverse changes such as light decay and color deviation. Light decay leads to reduced brightness, and color deviation leads to color temperature shift, which in turn affects color rendering, which is unacceptable in medical light sources. In addition, each LED lamp has subtle differences, and it is not advisable to rely on the manufacturer's test report to deduce the working life, which requires real-time warning of the LED life.

[0003] Regarding the problem in related technologies that the service life of a single LED lamp cannot be accurately predicted, no effective solution has been proposed so far. Summary of the Invention

[0004] In response to the problem in the related art that the service life of a single LED lamp cannot be accurately predicted, the present invention provides a control method, system, medical device and storage medium for light emitting diodes to at least solve the above problem.

[0005] According to one aspect of the present invention, a method for controlling a light emitting diode is provided, the method comprising:

[0006] Obtaining a first temperature value and a first pressure difference value of the light-emitting diode, calling a pre-stored first calibration data table for a first comparison based on the first temperature value and the first pressure difference value, calibrating the first pressure difference value based on a result of the first comparison, and obtaining a second pressure difference value, where the first calibration data table is a statistical table of initial temperature values ​​and initial voltage values ​​of the light-emitting diode;

[0007] Obtain the current value of the light-emitting diode, and based on the second voltage difference value and the current value, call the pre-stored second calibration data table for a second comparison. The second calibration data table is a statistical table of the initial voltage difference value and initial current value of the light-emitting diode. If the result of the second comparison does not meet the preset threshold, send an alarm message.

[0008] In one embodiment, obtaining the light emitting diode current value includes:

[0009] A pulse modulation (PWM) signal is acquired, and the current value is determined according to the PWM signal and a preset maximum current value.

[0010] In one embodiment, obtaining the first voltage difference value of the light emitting diode includes:

[0011] A differential operation circuit is connected to the two ends of the light emitting diode to obtain a first voltage difference value of the light emitting diode.

[0012] In one embodiment, obtaining the temperature value of the light emitting diode includes:

[0013] The resistance value of the thermistor NTC around the light-emitting diode is obtained, a second temperature value of the thermistor NTC is obtained according to a temperature-resistance curve, and the first temperature value of the light-emitting diode is determined according to the second temperature value of the thermistor NTC.

[0014] According to another aspect of the present invention, a control system for a light emitting diode is provided, the system comprising: a light emitting diode, a driving board, a voltage acquisition circuit, a temperature acquisition circuit and a microcontroller;

[0015] The temperature acquisition circuit obtains a first temperature value of the light emitting diode and sends it to the microcontroller;

[0016] The voltage acquisition circuit acquires a first voltage difference value of the light emitting diode and sends the first voltage difference value to the microcontroller;

[0017] The microcontroller controls and obtains the current value of the light emitting diode, and the driving board drives the light emitting diode according to the current value;

[0018] The microcontroller calls a pre-stored first calibration data table to perform a first comparison based on the first temperature value and the first pressure difference value, calibrates the first pressure difference value based on a result of the first comparison, and obtains a second pressure difference value, wherein the first calibration data table is a statistical table of initial temperature values ​​and initial voltage values ​​of the light-emitting diode;

[0019] The microcontroller calls a pre-stored second calibration data table for a second comparison based on the second voltage difference value and the current value. The second calibration data table is a statistical table of initial voltage difference values ​​and initial current values ​​of the light-emitting diode. If the result of the second comparison does not meet the preset threshold, an alarm message is sent.

[0020] In one embodiment, the driving board is connected to the light-emitting diode, and the microcontroller obtains a driving pulse modulation PWM signal, and determines the current value input by the driving board to the light-emitting diode based on the PWM signal and a preset maximum current value.

[0021] In one embodiment, when the voltage acquisition circuit is an operational differential circuit, the operational differential circuit is connected to both ends of the light-emitting diode to obtain the first voltage difference value of the light-emitting diode.

[0022] In one embodiment, when the temperature acquisition circuit is a thermistor NTC circuit, the microcontroller obtains the resistance value of the thermistor NTC of the thermistor NTC circuit around the light-emitting diode, obtains a second temperature value of the thermistor NTC according to a temperature-resistance curve, and determines the first temperature value of the light-emitting diode according to the second temperature value of the thermistor NTC.

[0023] According to one aspect of the present invention, a medical device is also provided, comprising a memory, a processor and a light emitting diode, wherein the memory stores a computer program, and the processor implements the steps of the above-mentioned light emitting diode control method when executing the computer program.

[0024] According to one aspect of the present invention, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps of the above-mentioned light emitting diode control method are implemented.

[0025] Through the present invention, a first temperature value and a first pressure difference value of a light-emitting diode are obtained, and based on the first temperature value and the first pressure difference value, a pre-stored first calibration data table is called for a first comparison, and after the first pressure difference value is calibrated based on the result of the first comparison, a second pressure difference value is obtained, and the first calibration data table is a statistical table of the initial temperature value and the initial voltage value of the light-emitting diode; the current value of the light-emitting diode is obtained, and based on the second pressure difference value and the current value, a pre-stored second calibration data table is called for a second comparison, and the second calibration data table is a statistical table of the initial pressure difference value and the initial current value of the light-emitting diode. When the result of the second comparison does not meet the preset threshold, an alarm message is sent, thereby solving the problem that the service life of a single LED lamp cannot be accurately predicted, and realizing accurate prediction and alarm of the service life of a single LED lamp. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0027] Figure 1 This is a structural framework of a light emitting diode control system according to an embodiment of the present invention. Figure 1 ;

[0028] Figure 2is a schematic diagram of initial working statistics of pressure drop and temperature according to an embodiment of the invention;

[0029] Figure 3 is a schematic diagram of initial working statistics of voltage drop and current according to an embodiment of the invention;

[0030] Figure 4 This is a structural framework of a light emitting diode control system according to an embodiment of the present invention. Figure 2 ;

[0031] Figure 5 is a schematic diagram of an operational amplifier differential input circuit according to an embodiment of the present invention;

[0032] Figure 6 2 is a schematic diagram of a thermistor NTC temperature acquisition circuit according to an embodiment of the present invention;

[0033] Figure 7 is a flow chart of a method for controlling a light emitting diode according to an embodiment of the present invention. DETAILED DESCRIPTION

[0034] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that, unless there is a conflict, the embodiments and features in the embodiments of the present application can be combined with each other.

[0035] The embodiment of the present invention provides a light emitting diode control system. Figure 1 This is a structural framework of a light emitting diode control system according to an embodiment of the present invention. Figure 1 ,like Figure 1 As shown, the system includes: a light emitting diode 11, a driving board 12, a voltage acquisition circuit 13, a temperature acquisition circuit 14 and a microcontroller 15;

[0036] The temperature acquisition circuit 14 obtains a first temperature value of the light emitting diode 11 and sends it to the microcontroller 15;

[0037] The voltage acquisition circuit 13 obtains the voltage difference value of the light emitting diode 11 and sends it to the microcontroller 15;

[0038] The microcontroller 15 controls and obtains the current value of the light emitting diode 11, and the driving board 12 drives the light emitting diode 11 according to the current value;

[0039] The microcontroller 15 calls a pre-stored first calibration data table to perform a first comparison based on the first temperature value and the first pressure difference value, calibrates the first pressure difference value based on the result of the first comparison, and obtains a second pressure difference value, wherein the first calibration data table is a statistical table of initial temperature values ​​and initial voltage values ​​of the light emitting diode; Figure 2is a schematic diagram of the initial working statistics of the pressure drop and temperature according to an embodiment of the invention, such as Figure 2 As shown, the forward voltage drop of the light-emitting diode is a curve that changes with temperature, and is a curve with a size offset. The offset of the forward voltage drop of the light-emitting diode 11 is negatively correlated with the operating temperature. For example, the first pressure difference value can be calibrated according to the forward voltage drop curve and adjusted to the second pressure difference value. Before the light-emitting diode 11 leaves the factory, it can be tested for a long time, for example, a 500-hour working test. The microcontroller 15 records the forward voltage drop of the light-emitting diode under normal operation at different temperatures, and generates the first calibration data table based on the offset of the forward voltage drop. The first calibration data table is used to calibrate the first pressure difference value to generate the second pressure difference value.

[0040] The microcontroller 15 calls a pre-stored second calibration data table for a second comparison based on the second voltage difference value and the current value. The second calibration data table is a statistical table of initial voltage difference values ​​and initial current values ​​of the light-emitting diode. If the result of the second comparison does not meet the preset threshold, an alarm message is sent. Figure 3 is a schematic diagram of the initial working statistics of the voltage drop and current according to an embodiment of the invention, such as Figure 3 As shown, the forward voltage drop of the light-emitting diode is a curve that changes with the current, which is the curve of the forward voltage drop itself. The offset of the forward voltage drop of the light-emitting diode 11 is positively correlated with the operating current. For example, when the second voltage difference value and the current value are compared with the curve, the comparison result exceeds the preset threshold value, and the microcontroller 15 generates an alarm message. Before the light-emitting diode 11 leaves the factory, it is tested for long-term operation, for example, a 500-hour operation test. The microcontroller 15 records the forward voltage drop of the light-emitting diode 11 under normal operation at different currents, and generates the second calibration data table based on the offset of the forward voltage drop. The second calibration data table is used to compare and judge the second voltage difference value to determine whether the voltage difference value of the light-emitting diode 11 is within the allowable range. If it exceeds the allowable range, it means that the light-emitting diode 11 can no longer work normally, and an alarm is issued to remind the user to replace it.

[0041] Through the above system, after the light-emitting diode 11 leaves the factory and starts working, the microcontroller 15 autonomously controls the current of the light-emitting diode 11, monitors the operating temperature, forward voltage drop value and current value of the light-emitting diode in real time, and calibrates the pressure difference value according to the first calibration data table. When the pressure difference value exceeds the reasonable range of the second calibration data table, an alarm is issued, which solves the problem that the service life of a single LED lamp cannot be accurately predicted, and realizes the accurate prediction and alarm of the service life of a single LED lamp.

[0042] In one embodiment, Figure 4This is a structural framework of a light emitting diode control system according to an embodiment of the present invention. Figure 2 ,like Figure 4 As shown, the system also includes an alarm circuit 21, which is electrically connected to the microcontroller 15. When the result of the second comparison exceeds the reasonable range of the second calibration data table, the microcontroller 15 sends an alarm signal to the alarm circuit 21, and the alarm circuit 21 issues an alarm. The alarm circuit 21 can be a light alarm for a light-emitting device or a sound alarm for a sound-emitting device.

[0043] In one embodiment, the driver board 12 is connected to the light-emitting diode 11, and the microcontroller 15 controls the magnitude of the current output by the driver board 12 to the light-emitting diode 11. The microcontroller 15 can set a variable current value range, and the driver board 12 outputs the variable current value to the light-emitting diode 11. The microcontroller 15 can also output PWM signals with different duty cycles. Based on the PWM signal and the preset maximum current value, the current value input by the driver board 12 to the light-emitting diode 11 is determined. The determination process includes: output current = PWM duty cycle * set maximum current, thereby realizing precise control of the current of the light-emitting diode 11.

[0044] In one embodiment, when the voltage acquisition circuit 13 is an operational differential circuit, the voltage difference value of the light emitting diode 11 is obtained by connecting the two ends of the light emitting diode 11 through the operational differential circuit. For example, Figure 5 Schematic diagram of an operational amplifier differential input circuit according to an embodiment of the present invention, Figure 5 As shown, the voltages at both ends of the light emitting diode 11 are V1 and V2 respectively, and the output voltage Vout is shown in Formula 1:

[0045]

[0046] When R1=R3,R2=R4,the output voltage Vout is as shown in Formula 2:

[0047]

[0048] Vout is connected to the AD sampling port of the analog-to-digital conversion of the microcontroller 15 , and the microcontroller 15 completes the sampling of the voltage difference value of the light emitting diode 11 .

[0049] In one embodiment, the temperature acquisition circuit 14 can acquire the temperature of the light-emitting diode 11 in a variety of ways. Among them, when the temperature acquisition circuit 14 uses a thermistor (Negative Temperature Coefficient, abbreviated as NTC) circuit, the temperature acquisition circuit 14 uses an NTC solution. The NTC is small in size and can be very close to the light-emitting diode 11. It has high accuracy, high sensitivity, and low cost, making it very suitable for measuring the operating temperature of the light-emitting diode 11. The resistance of the NTC decreases as the temperature increases. Figure 6 FIG. 1 is a schematic diagram of a thermistor NTC temperature acquisition circuit according to an embodiment of the present invention. Figure 6 As shown, the NTC is connected in series with a high-precision resistor R1. When the NTC resistance changes, the voltage across the NTC also changes. The subsequent op amp forms a voltage follower, improving the output signal's drive capability and reducing the possibility of interference. The circuit's output level, Vout, is shown in Formula 3:

[0050]

[0051] Vout is connected to the analog-to-digital converter sampling port of microcontroller 15 to collect the output voltage level. Microcontroller 15 converts Vout into the resistance value of the NTC at the current temperature according to Formula 4. It then compares this value with the temperature-resistance curve provided by the NTC manufacturer to determine the current NTC temperature, which is the current operating temperature of LED 11.

[0052]

[0053] The temperature acquisition circuit 14 and the microcontroller 15 acquire the resistance value of the thermistor NTC of the thermistor circuit NTC around the light-emitting diode 11, and acquire the second temperature value of the thermistor NTC based on the temperature-resistance curve (the temperature-resistance curve provided by the manufacturer). The first temperature value of the light-emitting diode 11 is determined based on the second temperature value of the thermistor NTC. If the NTC is relatively close to the light-emitting diode, the second temperature value can be determined as the first temperature value of the light-emitting diode 11. In one embodiment of the present invention, a control method for the light-emitting diode 11 is provided. Figure 7 FIG. 1 is a flow chart of a method for controlling a light emitting diode according to an embodiment of the present invention. Figure 7 As shown, the method includes the following steps:

[0054] Step S702: Obtain a first temperature value and a first voltage differential value of the light-emitting diode. Based on the first temperature value and the first voltage differential value, call a pre-stored first calibration data table for a first comparison. After calibrating the first voltage differential value based on the result of the first comparison, obtain a second voltage differential value. The first calibration data table is a statistical table of initial temperature values ​​and initial voltage values ​​of the light-emitting diode.

[0055] Step S704, obtain the current value of the light-emitting diode, and call the pre-stored second calibration data table for a second comparison based on the second voltage difference value and the current value. The second calibration data table is a statistical table of the initial voltage difference value and the initial current value of the light-emitting diode. If the result of the second comparison does not meet the preset threshold, an alarm message is sent.

[0056] Through the above steps S702 to S704, after the light-emitting diode 11 leaves the factory and starts working, the microcontroller 15 autonomously controls the current of the light-emitting diode 11, monitors the operating temperature, forward voltage drop value and current value of the light-emitting diode in real time, and calibrates the pressure difference value according to the first calibration data table. When the pressure difference value exceeds the reasonable range of the second calibration data table, an alarm is issued, which solves the problem that the service life of a single LED lamp cannot be accurately predicted, and realizes the accurate prediction and alarm of the service life of a single LED lamp.

[0057] In one embodiment, a medical device is further provided, including a memory, a processor, and a light emitting diode 11. The memory stores a computer program, and the processor implements the steps of the light emitting diode control method when executing the computer program.

[0058] According to another aspect of the present invention, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps of the method of the above embodiment are implemented.

[0059] Those skilled in the art will understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application may include non-volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory.

[0060] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] The above examples merely illustrate several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A method for controlling a light emitting diode, characterized in that: The method comprises: Obtaining a first temperature value and a first pressure difference value of a single light-emitting diode in a medical cold light source, calling a pre-stored first calibration data table for a first comparison based on the first temperature value and the first pressure difference value, calibrating the first pressure difference value based on a result of the first comparison, and obtaining a second pressure difference value, wherein the first calibration data table is a statistical table of initial temperature values ​​and initial voltage values ​​of the light-emitting diode; the first temperature value is the operating temperature value of the light-emitting diode, and the first calibration data table is determined based on an offset of a forward voltage drop of the light-emitting diode at different operating temperatures; obtaining a current value of the light-emitting diode, and performing a second comparison based on the second voltage difference value and the current value by calling a pre-stored second calibration data table, where the second calibration data table is a statistical table of initial voltage difference values ​​and initial current values ​​of the light-emitting diode, and sending an alarm message if a result of the second comparison does not meet a preset threshold; The step of obtaining a first voltage difference value of the light emitting diode includes: Connecting the two ends of the light emitting diode via an operational differential circuit to obtain a first voltage difference value of the light emitting diode: Obtaining a first temperature value of a light emitting diode includes: The resistance value of the thermistor NTC around the light-emitting diode is obtained, a second temperature value of the thermistor NTC is obtained according to a temperature-resistance curve, and the first temperature value of the light-emitting diode is determined according to the second temperature value of the thermistor NTC.

2. The method according to claim 1, characterized in that The obtaining of the light emitting diode current value comprises: A pulse modulation (PWM) signal is acquired, and the current value is determined according to the PWM signal and a preset maximum current value.

3. A light emitting diode control system, characterized in that: The system comprises: a single light emitting diode in a medical cold light source, a driver board, a voltage acquisition circuit, a temperature acquisition circuit and a microcontroller; The temperature acquisition circuit obtains a first temperature value of the light emitting diode and sends it to the microcontroller; The voltage acquisition circuit acquires a first voltage difference value of the light emitting diode and sends the first voltage difference value to the microcontroller; The microcontroller controls and obtains the current value of the light emitting diode, and the driving board drives the light emitting diode according to the current value; The microcontroller calls a pre-stored first calibration data table to perform a first comparison based on the first temperature value and the first pressure difference value, calibrates the first pressure difference value based on the result of the first comparison, and obtains a second pressure difference value, wherein the first calibration data table is a statistical table of initial temperature values ​​and initial voltage values ​​of the light-emitting diode; the first temperature value is the operating temperature of the light-emitting diode, and the first calibration data table is determined based on an offset of a forward voltage drop of the light-emitting diode at different operating temperatures; The microcontroller calls a pre-stored second calibration data table to perform a second comparison based on the second voltage difference value and the current value, where the second calibration data table is a statistical table of initial voltage difference values ​​and initial current values ​​of the light-emitting diodes, and sends an alarm message if a result of the second comparison does not meet a preset threshold; The step of obtaining a first voltage difference value of the light emitting diode includes: Connecting the two ends of the light emitting diode via an operational differential circuit to obtain a first voltage difference value of the light emitting diode: Obtaining a first temperature value of a light emitting diode includes: The resistance value of the thermistor NTC around the light-emitting diode is obtained, a second temperature value of the thermistor NTC is obtained according to a temperature-resistance curve, and the first temperature value of the light-emitting diode is determined according to the second temperature value of the thermistor NTC.

4. The system according to claim 3, characterized in that The driving board is connected to the light emitting diode, and the microcontroller obtains a driving pulse modulation PWM signal and determines the current value input to the light emitting diode by the driving board according to the PWM signal and a preset maximum current value.

5. The system according to claim 3, characterized in that: In the case where the temperature acquisition circuit is a thermistor NTC circuit, the microcontroller obtains the resistance value of the thermistor NTC of the thermistor NTC circuit around the light-emitting diode, obtains a second temperature value of the thermistor NTC according to a temperature-resistance curve graph, and determines the first temperature value of the light-emitting diode according to the second temperature value of the thermistor NTC.

6. A medical device comprising a memory, a processor and a light emitting diode, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 2 are implemented.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 2 are implemented.

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