Endless dimming eye protection circuit and lamp for the elderly

Abstract

The utility model discloses a utility model discloses an old person uses stepless light modulation eye protection circuit and lamps and lanterns, the circuit includes non -contact safety module, power module, environmental light detection module, biological rhythm module, physical knob control module, delay gradually dark module, two -way light modulation control module. AC power supply connects non -contact safety module and power module respectively, and non -contact safety module connects power module and delay gradually dark module, and power module is the power supply for other module, and two -way light modulation control module receives environmental light detection module, biological rhythm module, physical knob control module's signal, and is connected with delay gradually dark module, realizes safety protection, stable power supply, self -adaptation light modulation, conforms to the illumination of biological rhythm, manual stepless light modulation and delay gradually dark function, is suitable for old person uses, has the characteristics such as eye protection, safety, convenient.

Description

Technical Field

[0001] This utility model belongs to the field of dimming circuit technology, and relates to a stepless dimming eye protection circuit and lamp for the elderly. Background Technology

[0002] Existing lighting fixtures for the elderly have many shortcomings in terms of safety, dimming adaptability, and user-friendly design. Traditional lighting fixtures often lack non-contact safety mechanisms, and the use of contact-based current detection poses a risk of electric shock, making it difficult to ensure the electrical safety of the elderly. Regarding dimming functionality, most fixtures cannot dynamically adjust to ambient light, often resulting in excessively bright or dim light that makes it difficult to see. Furthermore, they do not consider the biorhythms of the elderly, and fixed lighting modes can easily disrupt their sleep patterns. In terms of operation, complex button or touch controls are not user-friendly for the elderly with limited mobility or slower reaction times, and there is a lack of convenient physical knob controls. In addition, existing lighting fixtures often turn off instantly, which can cause the elderly to bump into things when getting up at night to turn off the lights due to sudden darkness; the lack of a delayed dimming function improves safety. At the same time, the dimming precision is insufficient, failing to achieve stepless smooth dimming, and sudden changes in light can easily cause visual fatigue, failing to meet the eye protection needs of the elderly. These problems make it difficult for existing lighting fixtures to fully adapt to the physiological and usage needs of the elderly. Summary of the Invention

[0003] To address the problems existing in the background technology, this utility model proposes a stepless dimming eye-protection circuit and lamp for the elderly.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a stepless dimming eye protection circuit for the elderly, comprising: a non-contact safety module, a power supply module, an ambient light detection module, a biorhythm module, a physical knob control module, a delay dimming module, and a dual-channel dimming control module;

[0005] The AC power supply is connected to the non-contact safety module and the power module respectively. The non-contact safety module is connected to the power module and the delay dimming module respectively. The power module is connected to the ambient light detection module, the biological rhythm simulation module, the physical knob control module, and the dual-channel dimming control module respectively. The dual-channel dimming control module is connected to the ambient light detection module, the biological rhythm simulation module, the physical knob control module, and the delay dimming module respectively.

[0006] The non-contact safety module includes: current transformer CT1, reference Zener diode ZD2, comparator U4A, and trigger optocoupler U5;

[0007] The primary winding of current transformer CT1 is connected in series between the AC power supply line L and the power module AC1. The first terminal of the secondary winding of current transformer CT1 is connected to the non-inverting input terminal of comparator U4A. The cathode of reference Zener diode ZD2 is connected to the inverting input terminal of comparator U4A. The anode of reference Zener diode ZD2 is connected to the second terminal of the secondary winding of current transformer CT1 and ground. The output terminal of comparator U4A is connected to the anode of trigger optocoupler U5. The cathode of trigger optocoupler U5 is connected to ground. The collector of trigger optocoupler U5 is connected to the power module AC1. The emitter of trigger optocoupler U5 is connected to the PWR_DET terminal of the delay dimming module.

[0008] The power module includes: diode D3, fuse F1, rectifier bridge BR1, π-type filter network, and linear regulator U7;

[0009] Diode D3 is connected in parallel between the AC power supply L line and N line. Fuse F1 is connected in series between the AC power supply L line and the non-contact safety module. The AC1 terminal of rectifier bridge BR1 is connected to the non-contact safety module. The AC2 terminal of rectifier bridge BR1 is connected to the AC power supply N line. The DC+ terminal of rectifier bridge BR1 is connected to the π-type filter network. The π-type filter network is connected to the IN terminal of linear regulator U7. The GND terminal of linear regulator U7 is grounded. The OUT terminal of linear regulator U7 is connected to the first terminal of capacitor C6 and the DC+ terminal of rectifier bridge BR1. The second terminal of capacitor C6 is connected to ground.

[0010] The dual-channel dimming control module includes: driver chip U2, MOSFET Q1, MOSFET Q2, inductor L1, inductor L2, diode D1, diode D2, resistor R1, resistor R2, cool white LED group, warm white LED group, resistor R12, resistor R13, resistor R14, transconductance amplifier, and capacitor C1.

[0011] The DC+ terminal of rectifier bridge BR1 is connected to the first terminal of capacitor C1, the VCC terminal of driver chip U2, and the VCC terminal of transconductance amplifier. The second terminal of capacitor C1 is connected to the GND terminal and ground of driver chip U2. The DIM1 terminal of driver chip U2 is connected to the ambient light detection module. The DIM2 terminal of driver chip U2 is connected to the biorhythm simulation module. The OUT2 terminal of driver chip U2 is connected to the gate of MOSFET Q2. The source of MOSFET Q2 is connected to ground through series resistor R2. The drain of MOSFET Q2 is connected to the anode of diode D2. The cathode of diode D2 is connected to the warm white LED group through series inductor L2. The OUT1 terminal of driver chip U2 is connected to... The gate of MOSFET Q1 is connected to the ground, the source of MOSFET Q1 is connected to ground through series resistor R1, the drain of MOSFET Q1 is connected to the anode of diode D1, the cathode of diode D1 is connected to the cool white LED group through series inductor L1, the cathodes of the cool white LED group and the warm white LED group are connected to ground, the source of MOSFET Q1 is connected to the non-inverting input of transconductance amplifier through series resistor R12, the inverting input of transconductance amplifier is connected to ground through series resistor R14, the GND terminal of transconductance amplifier is connected to ground, the output terminal of transconductance amplifier is connected to the FB1 terminal of driver chip U2 through series resistor R13, and the FB2 terminal of driver chip U2 is connected to ground.

[0012] The biological rhythm module includes: clock chip U3, resistor R3, resistor R4, capacitor C2, and backup battery BAT1;

[0013] The DC+ terminal of rectifier bridge BR1 is connected to the VCC terminal of clock chip U3. The GND terminal of clock chip U3 is connected to ground. The VBAT terminal of clock chip U3 is connected to the positive terminal of backup battery BAT1. The negative terminal of backup battery BAT1 is connected to ground. The SQW terminal of clock chip U3 is connected to the first terminal of capacitor C2 and the DIM2 terminal of the dual-channel dimming control module. The second terminal of capacitor C2 is connected to ground. The SCL terminal of clock chip U3 is connected to the DC+ terminal of rectifier bridge BR1 through series resistor R4. The SDA terminal of clock chip U3 is connected to the DC+ terminal of rectifier bridge BR1 through series resistor R3.

[0014] The ambient light detection module includes: photoresistor RG1, resistor R5, resistor R6, temperature-compensated thermistor RT2, resistor R7, and capacitor C3;

[0015] The DC+ terminal of rectifier bridge BR1 is connected to the first terminal of photoresistor RG1. The second terminal of photoresistor RG1 is connected to the first terminal of temperature compensation thermistor RT2 through series resistor R6. The second terminal of temperature compensation thermistor RT2 is connected to the first terminal of resistor R7 and the first terminal of capacitor C3. The second terminals of resistor R7 and capacitor C3 are connected to ground. The second terminal of photoresistor RG1 is connected to the DIM1 terminal of dual-channel dimming control module through series resistor R5.

[0016] The physical knob control module includes: a magnetic rotary encoder EC1, resistor R8, resistor R9, and capacitor C4;

[0017] The VCC terminal of the magnetic rotary encoder EC1 is connected to the DC+ terminal of the rectifier bridge BR1. The OUTB terminal of the magnetic rotary encoder EC1 is connected to the DC+ terminal of the rectifier bridge BR1 through a series resistor R8. The OUTA terminal of the magnetic rotary encoder EC1 is connected to the DC+ terminal of the rectifier bridge BR1 through a series resistor R9. The OUTA terminal of the magnetic rotary encoder EC1 is connected to the first terminal of capacitor C4 and the DIM1 terminal of the dual-channel dimming control module. The second terminal of capacitor C4 and the GND terminal of the magnetic rotary encoder EC1 are connected to ground.

[0018] The delay dimming module includes: time base chip U6, resistor R11, capacitor C5, MOSFET Q3, and resistor R10;

[0019] The DC+ terminal of rectifier bridge BR1 is connected to the VCC terminal of timer chip U6 and the first terminal of resistor R10. The second terminal of resistor R10 is connected to the RESET terminal of timer chip U6. The TRIG terminal of timer chip U6 is connected to the PWR_DET terminal of the contactless safety module. The DIS terminal of timer chip U6 is connected to the first terminal of capacitor C5 through series resistor R11. The second terminal of capacitor C5 is connected to ground. The OUT terminal of timer chip U6 is connected to the gate of MOSFET Q3. The source of MOSFET Q3 is connected to ground. The drain of MOSFET Q3 is connected to the EN terminal of driver chip U2. The GND terminal of timer chip U6 is connected to ground.

[0020] This utility model also provides a lamp, including the aforementioned stepless dimming and eye-protection circuit for the elderly.

[0021] Compared with existing technologies, this utility model has the following advantages: By setting a non-contact safety module and using components such as current transformers to achieve safety detection, the electrical safety of the elderly during use is improved; the ambient light detection module can sense changes in ambient light in real time, and combined with the physical knob control module, stepless dimming can be achieved to meet the personalized needs of the elderly for different brightness levels; the biorhythm module adjusts the illumination according to the time information provided by the clock chip, which matches the physiological rhythm of the elderly and helps to improve their sleep; the delayed dimming module controls the light to turn off slowly through the time base chip, avoiding the risk of bumping or knocking caused by the sudden darkness after the lights are turned off at night; and the dual-channel dimming control module ensures stable dimming of the cool and warm white LED groups, thus improving the eye protection effect and ease of use of the lamp as a whole. Attached Figure Description

[0022] Figure 1 This is a circuit block diagram of a stepless dimming eye protection circuit for the elderly, according to this utility model.

[0023] Figure 2 This is the circuit connection diagram of the non-contact safety module of this utility model;

[0024] Figure 3 This is the circuit connection diagram of the power module of this utility model;

[0025] Figure 4 This is the circuit connection diagram of the dual-channel dimming control module of this utility model;

[0026] Figure 5 This is the circuit connection diagram of the biological rhythm module of this utility model;

[0027] Figure 6 This is the circuit connection diagram of the ambient light detection module of this utility model;

[0028] Figure 7 This is the circuit connection diagram of the physical knob control module of this utility model;

[0029] Figure 8 This is the circuit connection diagram of the delay dimming module of this utility model. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] like Figures 1-8As shown, the technical solution adopted by this utility model is as follows: a stepless dimming eye protection circuit for the elderly, comprising: a non-contact safety module, a power supply module, an ambient light detection module, a biorhythm module, a physical knob control module, a delay dimming module, and a dual-channel dimming control module;

[0032] The AC power supply is connected to the non-contact safety module and the power module respectively. The non-contact safety module is connected to the power module and the delay dimming module respectively. The power module is connected to the ambient light detection module, the biological rhythm simulation module, the physical knob control module, and the dual-channel dimming control module respectively. The dual-channel dimming control module is connected to the ambient light detection module, the biological rhythm simulation module, the physical knob control module, and the delay dimming module respectively.

[0033] The non-contact safety module includes: current transformer CT1, reference Zener diode ZD2, comparator U4A, and trigger optocoupler U5.

[0034] The primary winding of current transformer CT1 is connected in series between the AC power supply line L and the power module AC1. The first terminal of the secondary winding of current transformer CT1 is connected to the non-inverting input terminal of comparator U4A. The cathode of reference Zener diode ZD2 is connected to the inverting input terminal of comparator U4A. The anode of reference Zener diode ZD2 is connected to the second terminal of the secondary winding of current transformer CT1 and ground. The output terminal of comparator U4A is connected to the anode of trigger optocoupler U5. The cathode of trigger optocoupler U5 is connected to ground. The collector of trigger optocoupler U5 is connected to the power module AC1. The emitter of trigger optocoupler U5 is connected to the PWR_DET terminal of the delay dimming module.

[0035] The current transformer CT1 is a TA100-1 type, used for detecting AC circuit current. The reference Zener diode ZD2 is a 1N4733A, providing a stable reference voltage. The comparator U4A is an LM358, comparing the current detection signal with the reference voltage. The trigger optocoupler U5 is a PC817, used to isolate and transmit abnormal signals.

[0036] Specifically, the non-contact safety module connects the primary winding of current transformer CT1 in series between the AC power supply line L and the AC1 terminal of the power module. It senses changes in the current in the AC circuit, and these changes in the primary current generate a corresponding induced signal in the secondary winding of current transformer CT1. This induced signal from the secondary winding of current transformer CT1 is transmitted to the non-inverting input of comparator U4A and compared with the stable reference voltage provided by reference regulator ZD2 to the inverting input of comparator U4A. When the circuit current is abnormal, such as overcurrent or leakage causing the induced signal to exceed the reference voltage, the output of comparator U4A triggers optocoupler U5 to conduct. The emitter of optocoupler U5 transmits an abnormality detection signal to the PWR_DET terminal of the delay dimming module, thus achieving non-contact safety monitoring and abnormal signal transmission functions.

[0037] The power module includes: diode D3, fuse F1, rectifier bridge BR1, π-type filter network, and linear regulator U7;

[0038] Diode D3 is connected in parallel between the AC power supply L line and N line. Fuse F1 is connected in series between the AC power supply L line and the non-contact safety module. The AC1 terminal of rectifier bridge BR1 is connected to the non-contact safety module. The AC2 terminal of rectifier bridge BR1 is connected to the AC power supply N line. The DC+ terminal of rectifier bridge BR1 is connected to the π-type filter network. The π-type filter network is connected to the IN terminal of linear regulator U7. The GND terminal of linear regulator U7 is grounded. The OUT terminal of linear regulator U7 is connected to the first terminal of capacitor C6 and the DC+ terminal of rectifier bridge BR1. The second terminal of capacitor C6 is connected to ground.

[0039] Diode D3 is a 1N4007, providing lightning and overvoltage protection. Fuse F1 provides 2A / 250V overcurrent protection. Rectifier bridge BR1 is a KBPC1010, which rectifies AC power to DC power. Linear regulator U7 is an LM1117-3.3, providing a stable 3.3V output voltage.

[0040] In the power module, diode D3 is connected in parallel between the AC power supply lines L and N for protection. Fuse F1 is connected in series between the AC power supply line L and the non-contact safety module for overcurrent protection. The AC1 terminal of rectifier bridge BR1 is connected to the non-contact safety module, and the AC2 terminal is connected to the AC power supply line N, rectifying the input AC power into DC power. The DC+ terminal of rectifier bridge BR1 is connected to a π-type filter network to filter the rectified DC power and reduce ripple. The π-type filter network is connected to the IN terminal of linear regulator U7, which outputs a stable filtered voltage. The OUT terminal of linear regulator U7 is connected to the first terminal of capacitor C6 and the DC+ terminal of rectifier bridge BR1, further filtering the voltage. Ultimately, this provides a stable operating voltage for the ambient light detection module, the biorhythm simulation module, the physical knob control module, and the dual-channel dimming control module.

[0041] The dual-channel dimming control module includes: driver chip U2, MOSFET Q1, MOSFET Q2, inductor L1, inductor L2, diode D1, diode D2, resistor R1, resistor R2, cool white LED group, warm white LED group, resistor R12, resistor R13, resistor R14, transconductance amplifier, and capacitor C1.

[0042] The DC+ terminal of rectifier bridge BR1 is connected to the first terminal of capacitor C1, the VCC terminal of driver chip U2, and the VCC terminal of transconductance amplifier. The second terminal of capacitor C1 is connected to the GND terminal and ground of driver chip U2. The DIM1 terminal of driver chip U2 is connected to the ambient light detection module. The DIM2 terminal of driver chip U2 is connected to the biorhythm simulation module. The OUT2 terminal of driver chip U2 is connected to the gate of MOSFET Q2. The source of MOSFET Q2 is connected to ground through series resistor R2. The drain of MOSFET Q2 is connected to the anode of diode D2. The cathode of diode D2 is connected to the warm white LED group through series inductor L2. The OUT1 terminal of driver chip U2 is connected to the gate of MOSFET Q2. The gate of S-channel transistor Q1 is connected to ground. The source of MOSFET Q1 is connected to ground through a series resistor R1. The drain of MOSFET Q1 is connected to the anode of diode D1. The cathode of diode D1 is connected to the cool white LED group through a series inductor L1. The cathodes of the cool white LED group and the warm white LED group are connected to ground. The source of MOSFET Q1 is connected to the non-inverting input of the transconductance amplifier through a series resistor R12. The inverting input of the transconductance amplifier is connected to ground through a series resistor R14. The GND terminal of the transconductance amplifier is connected to ground. The output of the transconductance amplifier is connected to the FB1 terminal of driver chip U2 through a series resistor R13. The FB2 terminal of driver chip U2 is connected to ground.

[0043] The driver chip U2 is a PT4115, controlling the LED brightness. MOSFETs Q1 and Q2 are AO3400, switching between the cool white and warm white LED groups. Inductors L1 and L2 are 100μH, used for energy storage and filtering. Diodes D1 and D2 are SS34, providing freewheeling protection. The transconductance amplifier is an LMV358, used for current feedback regulation.

[0044] The dual-channel dimming control module receives and processes dimming signals from various modules to achieve precise stepless dimming of the cool white LED group and the warm white LED group. In the dual-channel dimming control module, the VCC terminal of the driver chip U2 is connected to the DC+ terminal of the rectifier bridge BR1 to obtain the operating voltage. The DIM1 terminal of the driver chip U2 is connected to the ambient light detection module, and the DIM2 terminal of the driver chip U2 is connected to the biorhythm simulation module to receive ambient light signals and biorhythm signals. Simultaneously, signals from the physical knob control module are also transmitted to this module, and these signals are combined for dimming control. The OUT1 terminal of the driver chip U2 is connected to the gate of the MOSFET Q1. By controlling the conduction level of the MOSFET Q1, the current of the cool white LED group is adjusted. The cool white LED group is connected to the MOSFET Q1 via inductor L1 and diode D1, and resistor R1 is used to detect the source current of the MOSFET Q1. The OUT2 terminal of the driver chip U2 is connected to the gate of the MOSFET Q2. Similarly, the current of the warm white LED group is adjusted by controlling the MOSFET Q2, and the source current of the MOSFET Q2 is detected by the resistor R2. The transconductance amplifier feeds back the source current signal of the MOSFET Q1 to the FB1 terminal of the driver chip U2 to realize the current closed-loop regulation, ensure the brightness of the cool white LED group is stable, and finally realize the independent and smooth dimming control of the cool and warm white LED groups.

[0045] The biological rhythm module includes: clock chip U3, resistor R3, resistor R4, capacitor C2, and backup battery BAT1.

[0046] The DC+ terminal of rectifier bridge BR1 is connected to the VCC terminal of clock chip U3. The GND terminal of clock chip U3 is connected to ground. The VBAT terminal of clock chip U3 is connected to the positive terminal of backup battery BAT1. The negative terminal of backup battery BAT1 is connected to ground. The SQW terminal of clock chip U3 is connected to the first terminal of capacitor C2 and the DIM2 terminal of the dual-channel dimming control module. The second terminal of capacitor C2 is connected to ground. The SCL terminal of clock chip U3 is connected to the DC+ terminal of rectifier bridge BR1 through series resistor R4. The SDA terminal of clock chip U3 is connected to the DC+ terminal of rectifier bridge BR1 through series resistor R3.

[0047] The clock chip U3 is a DS3231, providing a precise time signal. The backup battery BAT1 is a CR2032, which maintains clock operation even when power is off.

[0048] The function of the circadian rhythm module is to provide a time signal and transmit it to the dual-channel dimming control module to achieve dimming control that conforms to circadian rhythms. In the circadian rhythm module, the VCC terminal of clock chip U3 is connected to the DC+ terminal of rectifier bridge BR1 to obtain the operating voltage. The GND terminal of clock chip U3 is grounded, and the VBAT terminal of clock chip U3 is connected to the positive terminal of backup battery BAT1. Backup battery BAT1 supplies power to clock chip U3 when power is off, ensuring uninterrupted time signal transmission. The SQW terminal of clock chip U3 outputs a time-related signal. This signal, after being filtered by capacitor C2, is connected to the DIM2 terminal of the dual-channel dimming control module, transmitting the circadian rhythm information to the dual-channel dimming control module. Simultaneously, the SCL terminal of clock chip U3 is connected to the DC+ terminal of rectifier bridge BR1 through series resistor R4, and the SDA terminal of clock chip U3 is connected to the DC+ terminal of rectifier bridge BR1 through series resistor R3, ensuring stable operation of the clock chip and ultimately providing circadian rhythm-related time signal support for dimming control.

[0049] The ambient light detection module includes: photoresistor RG1, resistor R5, resistor R6, temperature-compensated thermistor RT2, resistor R7, and capacitor C3.

[0050] The DC+ terminal of rectifier bridge BR1 is connected to the first terminal of photoresistor RG1. The second terminal of photoresistor RG1 is connected to the first terminal of temperature compensation thermistor RT2 through series resistor R6. The second terminal of temperature compensation thermistor RT2 is connected to the first terminal of resistor R7 and the first terminal of capacitor C3. The second terminals of resistor R7 and capacitor C3 are connected to ground. The second terminal of photoresistor RG1 is connected to the DIM1 terminal of dual-channel dimming control module through series resistor R5.

[0051] The photoresistor RG1 is a GL5528, used to sense ambient light intensity. The temperature-compensated thermistor RT2 is an NTC 10K, used to compensate for the effect of temperature on detection.

[0052] The ambient light detection module detects ambient light intensity and converts it into an electrical signal, which is then transmitted to the dual-channel dimming control module to achieve adaptive adjustment of light brightness. In the ambient light detection module, the DC+ terminal of the rectifier bridge BR1 is connected to the first terminal of the photoresistor RG1 to power the module. The resistance of the photoresistor RG1 changes with the ambient light intensity. The second terminal of the photoresistor RG1 is connected to the first terminal of the temperature-compensated thermistor RT2 via a series resistor R6. The temperature-compensated thermistor RT2 is used to compensate for the impact of temperature changes on detection accuracy. The second terminal of the temperature-compensated thermistor RT2 is connected to the first terminal of resistor R7 and capacitor C3. Resistor R7 and capacitor C3 form a filter circuit to filter the detection signal. The second terminal of the photoresistor RG1 is connected to the DIM1 terminal of the dual-channel dimming control module via a series resistor R5, transmitting the electrical signal reflecting the ambient light intensity to the dual-channel dimming control module and providing ambient light data for dimming control.

[0053] The physical knob control module includes: a magnetic rotary encoder EC1, resistor R8, resistor R9, and capacitor C4.

[0054] The VCC terminal of the magnetic rotary encoder EC1 is connected to the DC+ terminal of the rectifier bridge BR1. The OUTB terminal of the magnetic rotary encoder EC1 is connected to the DC+ terminal of the rectifier bridge BR1 through a series resistor R8. The OUTA terminal of the magnetic rotary encoder EC1 is connected to the DC+ terminal of the rectifier bridge BR1 through a series resistor R9. The OUTA terminal of the magnetic rotary encoder EC1 is connected to the first terminal of capacitor C4 and the DIM1 terminal of the dual-channel dimming control module. The second terminal of capacitor C4 and the GND terminal of the magnetic rotary encoder EC1 are connected to ground.

[0055] The magnetic rotary encoder EC1 is EC11, which receives rotary dimming signals.

[0056] The physical knob control module receives the user's manual dimming operation signal and transmits it to the dual-channel dimming control module, enabling stepless manual adjustment of the light brightness. In the physical knob control module, the VCC terminal of the magnetic rotary encoder EC1 is connected to the DC+ terminal of the rectifier bridge BR1 to obtain the operating voltage. The OUTB and OUTA terminals of the magnetic rotary encoder EC1 are connected to the DC+ terminal of the rectifier bridge BR1 through series resistors to ensure signal stability. When the user rotates the magnetic rotary encoder EC1, the OUTA terminal of EC1 outputs a corresponding pulse signal. This signal is connected to the first terminal of capacitor C4. After filtering the signal, capacitor C4 transmits it to the DIM1 terminal of the dual-channel dimming control module, converting the user's manual dimming intention into an electrical signal and transmitting it to the dimming control module, thus enabling the user to manually control the light brightness.

[0057] The delay dimming module includes: time base chip U6, resistor R11, capacitor C5, MOSFET Q3, and resistor R10.

[0058] The DC+ terminal of rectifier bridge BR1 is connected to the VCC terminal of timer chip U6 and the first terminal of resistor R10. The second terminal of resistor R10 is connected to the RESET terminal of timer chip U6. The TRIG terminal of timer chip U6 is connected to the PWR_DET terminal of the contactless safety module. The DIS terminal of timer chip U6 is connected to the first terminal of capacitor C5 through series resistor R11. The second terminal of capacitor C5 is connected to ground. The OUT terminal of timer chip U6 is connected to the gate of MOSFET Q3. The source of MOSFET Q3 is connected to ground. The drain of MOSFET Q3 is connected to the EN terminal of driver chip U2. The GND terminal of timer chip U6 is connected to ground.

[0059] In the delay dimming module, the timer chip U6 is an NE555, which generates the delay signal. The MOSFET Q3 is an AO3401, which controls the dimming module's enable.

[0060] The function of the delay dimming module is to receive signals from the contactless safety module and control the dual-channel dimming control module to achieve a delayed dimming effect. In the delay dimming module, the DC+ terminal of the rectifier bridge BR1 is connected to the VCC terminal of the timer chip U6 and the first terminal of resistor R10 to power the module. The second terminal of resistor R10 is connected to the RESET terminal of the timer chip U6 to ensure stable reset. The TRIG terminal of the timer chip U6 is connected to the PWR_DET terminal of the contactless safety module to receive the safety detection signal. The DIS terminal of the timer chip U6 is connected to the first terminal of capacitor C5 through a series resistor R11. Resistor R11 and capacitor C5 work together to set the delay time. The OUT terminal of the timer chip U6 is connected to the gate of MOSFET Q3 to control the conduction and cutoff of MOSFET Q3. The drain of MOSFET Q3 is connected to the EN terminal of driver chip U2. By adjusting the conduction level of MOSFET Q3, the enable signal of the dual-channel dimming control module gradually changes, ultimately achieving the delayed dimming effect of the light.

[0061] Specifically, the AC power supply is connected to both the contactless safety module and the power module. The contactless safety module senses the AC circuit current through the current transformer CT1, compares it with the reference voltage of the reference Zener diode ZD2 via comparator U4A, and transmits a signal to the PWR_DET terminal of the delay dimming module through the trigger optocoupler U5 in case of an anomaly. At the same time, it connects to the power module to jointly ensure power supply safety.

[0062] In the power module, diode D3 and fuse F1 provide overvoltage and overcurrent protection, respectively. The rectifier bridge BR1 rectifies the AC power into DC power, which is then processed by the π-type filter network and the linear regulator U7 to output a stable DC voltage to power the ambient light detection module, the biorhythm module, the physical knob control module, and the dual-channel dimming control module.

[0063] The ambient light detection module senses the ambient light intensity through a photoresistor RG1. After being processed by a temperature-compensated thermistor RT2 and resistors and capacitors, the signal is transmitted to the DIM1 terminal of the dual-channel dimming control module.

[0064] The clock chip U3 of the circadian rhythm module provides a time signal under the protection of the backup battery BAT1. After being filtered by capacitor C2, the signal is transmitted to the DIM2 terminal of the dual-channel dimming control module.

[0065] The magnetic rotary encoder EC1 of the physical knob control module receives the manual rotation signal, which is then filtered by capacitor C4 and transmitted to the DIM1 terminal of the dual-channel dimming control module.

[0066] The dual-channel dimming control module's driver chip U2 comprehensively processes signals from ambient light, biological rhythms, and physical knobs. By controlling the conduction levels of MOSFETs Q1 and Q2, it adjusts the current of the cool white LED group (via inductor L1 and diode D1) and the warm white LED group (via inductor L2 and diode D2). The transconductance amplifier feeds back the current signal to the driver chip U2 to stabilize dimming.

[0067] When the contactless safety module transmits an abnormal signal to the TRIG terminal of the delay dimming module, the timer chip U6 sets a delay through resistor R11 and capacitor C5, controls the conduction state of MOSFET Q3, and causes a change in the EN terminal signal of driver chip U2, thus achieving delayed dimming of the light. Through the above process, all modules work together to achieve comprehensive control of the lighting fixture.

[0068] This application also provides a lamp, including the aforementioned stepless dimming eye-protection circuit for use by the elderly.

[0069] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A non-polar dimming eye protection circuit for the elderly, characterized by, It includes: a non-contact safety module, a power module, an ambient light detection module, a circadian rhythm module, a physical knob control module, a delayed dimming module, and a dual-channel dimming control module; The AC power supply is connected to the non-contact safety module and the power module respectively. The non-contact safety module is connected to the power module and the delay dimming module respectively. The power module is connected to the ambient light detection module, the biological rhythm simulation module, the physical knob control module, and the dual-channel dimming control module respectively. The dual-channel dimming control module is connected to the ambient light detection module, the biological rhythm simulation module, the physical knob control module, and the delay dimming module respectively.

2. The old person's eye protection circuit according to claim 1, wherein The non-contact safety module includes: current transformer CT1, reference Zener diode ZD2, comparator U4A, and trigger optocoupler U5; The primary winding of current transformer CT1 is connected in series between the AC power supply line L and the power module AC1. The first terminal of the secondary winding of current transformer CT1 is connected to the non-inverting input terminal of comparator U4A. The cathode of reference Zener diode ZD2 is connected to the inverting input terminal of comparator U4A. The anode of reference Zener diode ZD2 is connected to the second terminal of the secondary winding of current transformer CT1 and ground. The output terminal of comparator U4A is connected to the anode of trigger optocoupler U5. The cathode of trigger optocoupler U5 is connected to ground. The collector of trigger optocoupler U5 is connected to the power module AC1. The emitter of trigger optocoupler U5 is connected to the PWR_DET terminal of the delay dimming module.

3. The old person's eye protection circuit according to claim 2, wherein The power module includes: diode D3, fuse F1, rectifier bridge BR1, π-type filter network, and linear regulator U7; Diode D3 is connected in parallel between the AC power supply L line and N line. Fuse F1 is connected in series between the AC power supply L line and the non-contact safety module. The AC1 terminal of rectifier bridge BR1 is connected to the non-contact safety module. The AC2 terminal of rectifier bridge BR1 is connected to the AC power supply N line. The DC+ terminal of rectifier bridge BR1 is connected to the π-type filter network. The π-type filter network is connected to the IN terminal of linear regulator U7. The GND terminal of linear regulator U7 is grounded. The OUT terminal of linear regulator U7 is connected to the first terminal of capacitor C6 and the DC+ terminal of rectifier bridge BR1. The second terminal of capacitor C6 is connected to ground.

4. The old person's eye protection circuit according to claim 3, wherein The dual-channel dimming control module includes: driver chip U2, MOSFET Q1, MOSFET Q2, inductor L1, inductor L2, diode D1, diode D2, resistor R1, resistor R2, cool white LED group, warm white LED group, resistor R12, resistor R13, resistor R14, transconductance amplifier, and capacitor C1. The DC+ terminal of rectifier bridge BR1 is connected to the first terminal of capacitor C1, the VCC terminal of driver chip U2, and the VCC terminal of transconductance amplifier. The second terminal of capacitor C1 is connected to the GND terminal and ground of driver chip U2. The DIM1 terminal of driver chip U2 is connected to the ambient light detection module. The DIM2 terminal of driver chip U2 is connected to the biorhythm simulation module. The OUT2 terminal of driver chip U2 is connected to the gate of MOSFET Q2. The source of MOSFET Q2 is connected to ground through series resistor R2. The drain of MOSFET Q2 is connected to the anode of diode D2. The cathode of diode D2 is connected to the warm white LED group through series inductor L2. The OUT1 terminal of driver chip U2 is connected to... The gate of MOSFET Q1 is connected to the ground, the source of MOSFET Q1 is connected to ground through series resistor R1, the drain of MOSFET Q1 is connected to the anode of diode D1, the cathode of diode D1 is connected to the cool white LED group through series inductor L1, the cathodes of the cool white LED group and the warm white LED group are connected to ground, the source of MOSFET Q1 is connected to the non-inverting input of transconductance amplifier through series resistor R12, the inverting input of transconductance amplifier is connected to ground through series resistor R14, the GND terminal of transconductance amplifier is connected to ground, the output terminal of transconductance amplifier is connected to the FB1 terminal of driver chip U2 through series resistor R13, and the FB2 terminal of driver chip U2 is connected to ground.

5. The stepless dimming eye protection circuit for the elderly according to claim 4, characterized in that, The biological rhythm module includes: clock chip U3, resistor R3, resistor R4, capacitor C2, and backup battery BAT1; The DC+ terminal of rectifier bridge BR1 is connected to the VCC terminal of clock chip U3. The GND terminal of clock chip U3 is connected to ground. The VBAT terminal of clock chip U3 is connected to the positive terminal of backup battery BAT1. The negative terminal of backup battery BAT1 is connected to ground. The SQW terminal of clock chip U3 is connected to the first terminal of capacitor C2 and the DIM2 terminal of the dual-channel dimming control module. The second terminal of capacitor C2 is connected to ground. The SCL terminal of clock chip U3 is connected to the DC+ terminal of rectifier bridge BR1 through series resistor R4. The SDA terminal of clock chip U3 is connected to the DC+ terminal of rectifier bridge BR1 through series resistor R3.

6. The stepless dimming eye-protection circuit for the elderly according to claim 4, characterized in that, The ambient light detection module includes: photoresistor RG1, resistor R5, resistor R6, temperature-compensated thermistor RT2, resistor R7, and capacitor C3; The DC+ terminal of rectifier bridge BR1 is connected to the first terminal of photoresistor RG1. The second terminal of photoresistor RG1 is connected to the first terminal of temperature compensation thermistor RT2 through series resistor R6. The second terminal of temperature compensation thermistor RT2 is connected to the first terminal of resistor R7 and the first terminal of capacitor C3. The second terminals of resistor R7 and capacitor C3 are connected to ground. The second terminal of photoresistor RG1 is connected to the DIM1 terminal of dual-channel dimming control module through series resistor R5.

7. The stepless dimming eye protection circuit for the elderly according to claim 4, characterized in that, The physical knob control module includes: a magnetic rotary encoder EC1, resistor R8, resistor R9, and capacitor C4; The VCC terminal of the magnetic rotary encoder EC1 is connected to the DC+ terminal of the rectifier bridge BR1. The OUTB terminal of the magnetic rotary encoder EC1 is connected to the DC+ terminal of the rectifier bridge BR1 through a series resistor R8. The OUTA terminal of the magnetic rotary encoder EC1 is connected to the DC+ terminal of the rectifier bridge BR1 through a series resistor R9. The OUTA terminal of the magnetic rotary encoder EC1 is connected to the first terminal of capacitor C4 and the DIM1 terminal of the dual-channel dimming control module. The second terminal of capacitor C4 and the GND terminal of the magnetic rotary encoder EC1 are connected to ground.

8. The stepless dimming eye protection circuit for the elderly according to claim 4, characterized in that, The delay dimming module includes: time base chip U6, resistor R11, capacitor C5, MOSFET Q3, and resistor R10; The DC+ terminal of rectifier bridge BR1 is connected to the VCC terminal of timer chip U6 and the first terminal of resistor R10. The second terminal of resistor R10 is connected to the RESET terminal of timer chip U6. The TRIG terminal of timer chip U6 is connected to the PWR_DET terminal of the contactless safety module. The DIS terminal of timer chip U6 is connected to the first terminal of capacitor C5 through series resistor R11. The second terminal of capacitor C5 is connected to ground. The OUT terminal of timer chip U6 is connected to the gate of MOSFET Q3. The source of MOSFET Q3 is connected to ground. The drain of MOSFET Q3 is connected to the EN terminal of driver chip U2. The GND terminal of timer chip U6 is connected to ground.

9. A lamp, comprising the stepless dimming eye-protection circuit for use by the elderly as described in claims 1-8.

Images