An illuminance change rate adjustment device and adjustment method based on task response time

Abstract

The present invention discloses an illuminance change rate adjustment device and an adjustment method based on task response time. The illuminance change rate adjustment device includes a power supply module, a time acquisition device, a DSP module, a BUCK circuit module, and an LED lighting module. The power supply module provides power for the time acquisition device, the DSP module, the BUCK circuit module, and the LED lighting module. The time acquisition device is used to collect the response time of the operator. The DSP module is used to process the response time of the operator collected by the time acquisition device, and uses the epwm peripheral of the DSP to output a PWM wave corresponding to the illuminance change period T. The PWM wave is input to the switch of the BUCK circuit module as a driving signal. The BUCK circuit module adjusts and controls the illuminance change rate of the LED lighting module according to the driving signal output by the DSP module. The device automatically identifies the difference between the response time of the operator to complete the task and the expected response time by collecting the response time, and timely adjusts the illuminance change rate to guide the physiological alertness of the personnel.

Description

Technical Field

[0001] The present invention relates to the technical field of lighting systems, and in particular, to an illuminance change rate adjusting device and an adjusting method based on task response time. Background Art

[0002] The lighting environment can affect the alertness and work efficiency of operators. At present, most of the research on lighting systems focuses on static lighting, and the light environment is adjusted by changing lighting brightness, color temperature, etc. to change the visual perception of people; there is less research on dynamic lighting, mainly focusing on changing common lighting parameters, and there is still a gap in the research on the adjustment of illuminance change rate. Summary of the Invention

[0003] Aiming at the above problems, the present invention aims to provide an illuminance change rate adjusting device and an adjusting method based on task response time. By collecting the response time of an operator to complete a task, automatically identifying the difference between it and the expected response time, and timely regulating the illuminance change rate to guide the physiological alertness of the person.

[0004] In order to achieve the above object, the technical solutions adopted by the present invention are as follows:

[0005] An illuminance change rate adjusting device based on task response time, characterized in that: it includes a power supply module, a time acquisition device, a DSP module, a BUCK circuit module, and an LED lighting module;

[0006] The power supply module provides power for the time acquisition device, the DSP module, the BUCK circuit module, and the LED lighting module;

[0007] The time acquisition device is used to collect the response time of the operator;

[0008] The DSP module is used to process the response time of the operator collected by the time acquisition device, and use the epwm peripheral of the DSP to output a PWM wave corresponding to the illuminance change period T, and the PWM wave is input to the switch of the BUCK circuit module as a driving signal;

[0009] The BUCK circuit module adjusts and controls the illuminance change rate of the LED lighting module according to the driving signal output by the DSP module.

[0010] Further, the time acquisition device includes a stimulus display module and a response button. The stimulus display module is used to generate a stimulus graph, and the response button is used for the operator to perform a response operation. When the operator presses the response button, the stimulus graph is interrupted.

[0011] Further, the DSP module includes a counter, a signal generation circuit CPU2, and a control circuit CPU1;

[0012] The counter counts the time from the appearance of the stimulus pattern on the stimulus display module to the interruption of the pattern, and inputs the counting result t as the reaction time into the signal generation circuit CPU2;

[0013] The signal generation circuit CPU2 calculates the illumination change period T based on the reaction time t of the operator and the expected reaction time t ref and outputs it to the control circuit CPU1;

[0014] The control circuit CPU1 generates a corresponding PWM signal as the driving signal for the BUCK circuit module according to the illumination change period T.

[0015] Furthermore, the signal generation circuit CPU2 calculates the illumination change period T based on the reaction time t of the operator and the expected reaction time t ref The specific operations for calculating the illumination change period T include the following steps,

[0016] Step 1: The signal generation circuit CPU2 calculates the difference Δt between the reaction time t of the operator and the expected reaction time t ref ;

[0017] Step 2: Calculate the relationship between the change value Δv of the illumination change rate and Δt, and output Δv;

[0018] Step 3: Add the illumination change rate v k-1 in the previous stage to Δv to obtain the illumination change rate v k output at the current moment, that is, v k = v k-1 +Δv;

[0019] Step 4: Calculate the current illumination change period T according to the current illumination change rate, then T = 600 / v k .

[0020] Furthermore, in Step 2, the relationship between the change value Δv of the illumination change rate and Δt is calculated according to the formula t = 300.3e -0.6274v +01.427e -0.0016v ;

[0021] In the formula, v represents the illumination change rate, and the change value Δv of the illumination change rate can be obtained according to Δt obtained in Step 1.

[0022] Furthermore, the control circuit CPU1 includes resistors R 1 , R 2 , a low-pass filter LPF, a controller, a PI regulator, and a drive circuit. R 1 , R 2The voltage output by the LED lighting module is divided, and the sampling of the voltage output by the LED lighting module is completed through the low-pass filter LPF;

[0023] The controller uses the current illumination change period T output by the signal generation circuit CPU2 as the reference voltage V of the LED lighting module ref and converts the collected voltage output by the LED lighting module into a digital signal, and makes a difference with the reference voltage V ref The duty ratio is output through the PI regulator, and then a PWM signal is generated through the drive circuit as the drive signal of the BUCK circuit module.

[0024] Furthermore, the BUCK circuit module includes switches Q1, Q2, an inductor L, and capacitors C 1 、C 2 The input voltage of the BUCK circuit module is V in and V in is supplied with a constant voltage. By adjusting the duty ratio of switches Q 1 、Q 2 the voltage output to the lighting system is controlled; when Q 1 is turned on and Q 2 is turned off, the current in the inductor L increases, and the voltage of the lighting system is equal to V in -V L and the actually output voltage to the lighting system rises, where V L represents the voltage across the inductor L, and the direction of V L is positive on the left and negative on the right; when Q 1 is turned off and Q 2 is turned on, the voltage of the lighting system is provided by the energy stored in the inductor during the previous conduction, and the voltage of the lighting system is equal to -V L and continuously decreases.

[0025] Furthermore, a regulation method for an illumination change rate regulation device based on task response time is characterized by including the following steps,

[0026] S1: Input the human body's expected reaction time t ref that has been experimentally verified into the signal generation circuit CPU2 of the device;

[0027] S2: The time acquisition device presents a stimulus pattern, and the operator makes an identification judgment and makes a reaction;

[0028] S3: The DSP module calculates and processes the reaction time of the operator and outputs a corresponding PWM wave as the drive signal of the BUCK circuit module;

[0029] S4: The BUCK circuit module adjusts the illumination change rate of the LED lighting module;

[0030] S5: Repeat steps S2 - S5 to adjust the illumination change rate of the LED lighting module in real - time.

[0031] The beneficial effects of the present invention are as follows:

[0032] 1. The present invention discloses an illumination change rate adjustment device based on task reaction time. This device can collect the reaction time of the operator and dynamically adjust the corresponding illumination change rate of the lighting system according to the reaction time of the operator, thereby intervening and guiding the physiological alertness of the operator and improving work efficiency.

[0033] 2. In the illumination change rate adjustment device of the present invention, the DSP module processes the reaction time and expected reaction time of the operator, and outputs the current illumination change period T as the reference voltage V of the LED lighting module. ref When the output voltage value of the LED lighting module is less than the reference voltage V ref it will increase the output duty cycle, thereby increasing the conduction time and increasing the output voltage; when the output voltage value of the LED lighting module is greater than the reference voltage V ref it will decrease the output duty cycle, thereby reducing the conduction time and reducing the output voltage, increasing the switching frequency to make the output voltage follow the command voltage faster, making the whole device more responsive. Description of the Drawings

[0034] Figure 1 is a schematic structural diagram of the illumination change rate adjustment device based on task reaction time in the present invention;

[0035] Figure 2 is the fitting curve of different illumination change rates and the reaction time of the operator in the present invention;

[0036] Figure 3 is the flow chart of the adjustment method of the illumination change rate adjustment device based on task reaction time in the present invention;

[0037] Figure 4 is an example diagram of the input reference voltage waveform in the second embodiment of the present invention. Detailed Embodiments

[0038] In order to enable those of ordinary skill in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be further described below with reference to the drawings and embodiments.

[0039] Embodiment 1:

[0040] An illumination change rate adjustment device based on task reaction time, as shown in the attached Figure 1 figure, includes a power supply module, a time acquisition device, a DSP module, a BUCK circuit module, and an LED lighting module;

[0041] The power supply module provides power for the time acquisition device, DSP module, BUCK circuit module, and LED lighting module;

[0042] The time acquisition device is used to acquire the reaction time of the operator;

[0043] The DSP module is used to process the reaction time of the operator acquired by the time acquisition device, and uses the epwm peripheral of the DSP to output a PWM wave corresponding to the illumination change period T. The PWM wave is input to the switch of the BUCK circuit module as a driving signal;

[0044] The BUCK circuit module adjusts and controls the illumination change rate of the LED lighting module according to the driving signal output by the DSP module.

[0045] Specifically, the time acquisition device includes a stimulus display module and a reaction button. The stimulus display module is used to generate a stimulus pattern, and the reaction button is used for the operator to perform a reaction operation. When the operator presses the reaction button, the stimulus pattern is interrupted.

[0046] The DSP module includes a counter, a signal generation circuit CPU2, and a control circuit CPU1;

[0047] The counter counts the time from the appearance of the stimulus pattern by the stimulus display module to the interruption of the pattern, and inputs the counting result t as the reaction time to the signal generation circuit CPU2;

[0048] The signal generation circuit CPU2 calculates the illumination change period T according to the reaction time t of the operator and the expected reaction time t ref and outputs it to the control circuit CPU1;

[0049] The control circuit CPU1 generates a corresponding PWM signal according to the illumination change period T as the driving signal for the BUCK circuit module.

[0050] The control circuit CPU1 includes resistors R 1 、R 2 (for voltage acquisition), a low-pass filter LPF, a controller, a PI regulator, and a drive circuit. R 1 、R 2 divide the voltage output by the LED lighting module, and complete the sampling of the voltage output by the LED lighting module through the low-pass filter LPF;

[0051] Since the overall brightness of the LED lighting module is positively correlated with the input power, the current illumination change period T output by the signal generation circuit CPU2 can be used as the change period of the input voltage of the LED lighting module. The controller uses this value as the reference voltage of the voltage loop of the BUCK circuit module, and converts the collected output voltage of the LED lighting module into a digital signal, which is compared with the reference voltage V ref to obtain the difference. After passing through the PI regulator, the duty cycle is output, and then a PWM signal is generated through the drive circuit as the drive signal of the BUCK circuit module. When the output voltage value of the LED lighting module is less than the reference voltage V ref , it will increase the output duty cycle, thereby increasing the conduction time and increasing the output voltage; when the output voltage value of the LED lighting module is greater than the reference voltage V ref , it will decrease the output duty cycle, thereby reducing the conduction time and decreasing the output voltage, and increasing the switching frequency to make the output voltage follow the command voltage faster, making the entire device more responsive. Since the reaction time sampling frequency of the operator is much lower than the output voltage sampling frequency of the LED lighting module, the control circuit and the signal generation circuit are respectively set in two different CPUs.

[0052] The BUCK circuit module includes switches Q1, Q2, inductor L, and capacitors C 1 and C 2 . The input voltage of the BUCK circuit module is V in , and V in is a constant voltage power supply. By adjusting the duty cycle of switches Q 1 and Q 2 , the voltage output to the lighting system is controlled; when Q 1 conducts and Q 2 turns off, the current in the inductor L increases, and the voltage of the lighting system is equal to V in -V L . The actual voltage output to the lighting system rises, where V L represents the voltage across the inductor L, and the direction of V L is positive on the left and negative on the right; when Q 1 turns off and Q 2 conducts, the voltage of the lighting system is provided by the energy stored in the inductor during the previous conduction, and the voltage of the lighting system is equal to -V L and continuously decreases. The functions of capacitors C 1 and C 2 in the circuit are voltage stabilization and filtering; when selecting the inductor L, it is necessary to ensure that the BUCK circuit operates in the continuous mode, that is, the inductor current is continuous; the switching frequencies of Q 1 and Q 2 can be increased to reduce the influence of switching ripple.

[0053] More specifically, the CPU2 of the signal generation circuit calculates the difference between the reaction time t of the operator and the expected reaction time t ref The specific operations for calculating the illuminance change period T include the following steps

[0054] Step 1: After removing the outliers from the reaction time of the subjects to complete the task through experiments, perform averaging to determine the expected reaction time t ref , and the CPU2 of the signal generation circuit calculates the difference Δt between the reaction time t of the operator and the expected reaction time t ref , where the expected reaction time t ref is preset in the CPU2 of the signal generation circuit in advance;

[0055] Step 2: Calculate the relationship between the change value Δv of the illuminance change rate and Δt, and output Δv;

[0056] Design a visual task through E-prime, set different illuminance change rates, and collect the reaction times of the operator to complete the task in each lighting environment respectively. Organize and analyze the reaction times of the operator to complete the task, find the relationship between them and the illuminance change rate, and select the fitting methods of exponential fitting and polynomial fitting through matlab. The results are as shown in the appendix Figure 2 As shown, it is found through comparison that the exponential fitting has a higher goodness of fit, and the fitting curve is as shown in the following formula

[0057] t = 300.3e -0.6274v +01.427e -0.0016v

[0058] In the formula, v represents the illuminance change rate; according to Δt obtained in Step 1, the change value Δv of the illuminance change rate can be calculated.

[0059] Step 3: Add the illuminance change rate v k-1 in the previous stage to Δv to obtain the illuminance change rate v k output at the current moment, that is, v k = v k-1 +Δv;

[0060] Step 4: Since the illuminance change range is 0lx - 300lx, and then from 300lx - 0lx, and so on, the entire illuminance change range is 600lx. The ratio of the total illuminance to the illuminance change rate v k is the time period of the illuminance change. Therefore, according to the current illuminance change rate, the current illuminance change period T can be calculated

[0061] T = 600 / v k .

[0062] Example 2:

[0063] Adjustment method of an illuminance change rate adjustment device based on task response time, as shown in the appendix Figure 3 It includes the following steps

[0064] S1: Input the human body's expected response time t that has been verified by experiments into the signal generation circuit CPU2 of the device; ref

[0065] S2: The time acquisition device presents a stimulus pattern, and the operator makes an identification judgment and responds;

[0066] S3: The DSP module calculates and processes the response time of the operator, and outputs a corresponding PWM wave as the drive signal for the BUCK circuit module;

[0067] S4: The BUCK circuit module adjusts the illuminance change rate of the LED lighting module;

[0068] S5: Repeat steps S2 - S5 to adjust the illuminance change rate of the LED lighting module in real time.

[0069] In the present invention, the adjustment method of the illuminance change rate controls the power input to the LED lamp by controlling the change rate of the output voltage of the BUCK circuit to match the lighting change rate, thereby controlling the illuminance change rate of the LED lamp. As shown in the appendix Figure 4 is an example waveform of the input reference voltage, which changes with the light intensity. After adjusting using the adjustment method in the present invention, the waveform of the output voltage is also as shown in the appendix Figure 4 shown, and the actually output voltage waveform is consistent with the given voltage waveform.

[0070] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.​

Claims

1. An illuminance change rate adjustment device based on task response time, Characterized in that: It includes a power supply module, a time acquisition device, a DSP module, a BUCK circuit module, and an LED lighting module; The power supply module provides power for the time acquisition device, the DSP module, the BUCK circuit module, and the LED lighting module; The time acquisition device is used to acquire the response time of the operator; The DSP module is used to process the response time of the operator acquired by the time acquisition device, and use the epwm peripheral of the DSP to output a PWM wave corresponding to the illuminance change period T. The PWM wave is input to the switch of the BUCK circuit module as a driving signal; The BUCK circuit module adjusts and controls the illuminance change rate of the LED lighting module according to the driving signal output by the DSP module; The time acquisition device includes a stimulus display module and a response button. The stimulus display module is used to generate a stimulus graph, and the response button is used for the operator to perform a response operation. When the operator presses the response button, the stimulus graph is interrupted; The DSP module includes a counter, a signal generation circuit CPU2, and a control circuit CPU1; The counter counts the time from the appearance of the stimulus graph by the stimulus display module to the interruption of the graph, and inputs the counting result t as the response time to the signal generation circuit CPU2; The signal generation circuit CPU2 calculates the illumination change period T based on the reaction time t of the operator and the expected reaction time t ref and outputs it to the control circuit CPU1; The control circuit CPU1 generates a corresponding PWM signal as the driving signal of the BUCK circuit module according to the illuminance change period T; The signal generation circuit CPU2 calculates the illumination change period T based on the reaction time t of the operator and the desired reaction time t ref The specific operations for calculating the illumination change period T include the following steps Step 1: The CPU 2 of the signal generation circuit calculates the difference Δt between the reaction time t of the operator and the expected reaction time t ref ; Step 2: Calculate the relationship between the change value Δv of the illuminance change rate and Δt, and output Δv; Step 3: Add the illuminance change rate v in the previous stage k-1 to Δv to obtain the illuminance change rate v output at the current moment k , that is, v k = v k-1 + Δv; Step 4: Calculate the current illumination change period T according to the current illumination change rate, where T = 600 / v k .

2. An illuminance change rate adjustment device based on task response time according to claim 1, Characterized in that, In Step 2, the relationship between the change value Δv of the illumination change rate and Δt is calculated according to the formula t = 300.3e -0.627v + 0.1427e -0.0016v obtained; In the formula, v represents the illuminance change rate, and the change value Δv of the illuminance change rate can be obtained according to Δt obtained in step 1.

3. An illuminance change rate adjustment device based on task response time according to claim 2, Characterized in that, The control circuit CPU1 includes resistors R 1 , R 2 , a low-pass filter LPF, a controller, a PI regulator, and a drive circuit. Resistors R 1 , R 2 divide the voltage output by the LED lighting module, and the sampling of the voltage output by the LED lighting module is completed through the low-pass filter LPF; The controller takes the current illumination change period T output by the signal generation circuit CPU2 as the reference voltage V of the LED lighting module ref , and converts the output voltage of the LED lighting module collected into a digital signal, which is subtracted from the reference voltage V ref . After that, the duty cycle is output through a PI regulator, and then a PWM signal is generated through a drive circuit as the drive signal of the BUCK circuit module.

4. An illuminance change rate adjustment device based on task response time according to claim 3, Characterized in that, The BUCK circuit module includes switches Q1, Q2, inductor L, and capacitor C 1 , C 2 , and the input voltage of the BUCK circuit module is V in , and V in is powered by a constant voltage. By adjusting the duty cycles of Q 1 , Q 2 switches, the voltage output to the lighting system is controlled; when Q 1 conducts and Q 2 turns off, the current in inductor L increases, and the voltage of the lighting system is equal to V in -V L , and the actual voltage output to the lighting system rises. Here, V L represents the voltage across inductor L, and the direction of V L is positive on the left and negative on the right; when Q 1 turns off and Q 2 conducts, the voltage of the lighting system is provided by the energy stored in the inductor during the previous conduction. The voltage of the lighting system is equal to -V L , and it continuously decreases.

5. An adjustment method for an illuminance change rate adjustment device based on task response time according to any one of claims 1-4, Characterized in that, It includes the following steps, S1: Input the experimentally verified human expected reaction time t ref into the signal generation circuit CPU2 of the input device; S2: The time acquisition device presents a stimulus graph, and the operator makes an identification and judgment and makes a response; S3: The DSP module calculates and processes the response time of the operator, and outputs a corresponding PWM wave as the driving signal of the BUCK circuit module; S4: The BUCK circuit module adjusts the illuminance change rate of the LED lighting module; S5: Repeat steps S2-S5 to perform real-time update adjustment on the illuminance change rate of the LED lighting module.

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