CN105828474A - Two-stage LED safety monitoring lighting device - Google Patents

Abstract

The invention discloses a two-stage LED safety monitoring illumination device, wherein when the device enters the night, an LED light source automatically lights and displays low-brightness illumination, and when an action detector detects an invasive action, the LED light source is immediately switched from low-order illumination to high-order illumination and is continuously delayed for a short time, and then the LED light source is recovered to the low-order illumination so as to save energy. The device comprises a power management unit, a photosensitive switch control unit, an action detection unit, a load and power control unit, a zero crossing point detection circuit and a light-emitting unit. The light-emitting unit comprises a phase angle controller and an alternating current light source, wherein the phase angle controller is connected with the alternating current light source in series and is connected to an alternating current power supply, and the alternating current light source is composed of one or more light-emitting diodes. The load and power control unit comprises a microcontroller which controls the conduction time of the phase angle controller and adjusts the average electric power of the light-emitting unit. When the action detection unit detects an intrusion action, the load and power control unit increases the average electric power of the light-emitting unit, so that the light-emitting unit generates high-level brightness and lasts for a preset time.

Description

Two-stage light-emitting diode safety monitoring lighting device

This application is a divisional application for an invention patent with an application date of July 14, 2011, an application number of 201110201785.5, and an invention title of "two-stage light-emitting diode safety monitoring lighting device".

technical field

The invention relates to a lighting device, and in particular to a two-stage light-emitting diode safety monitoring lighting device with high and low order brightness.

Background technique

Various types of light sources such as incandescent lamps, fluorescent lamps, halogen lamps, and light-emitting diodes are existing lighting devices. Outdoor lighting devices usually use photoresistors to automatically start the light source of the lamp, which is called Photo-Control Mode (PC mode for short). The lighting is turned off or switched to a lower brightness, which is called Power-Saving Mode (PS mode for short). In the energy-saving mode, a motion detector is often used. When a person is detected to be close to the lamp, the lamp is turned on again for full-brightness lighting. A short time, then back to energy-saving mode. Whether it is to automatically start the lighting by detecting the brightness of the background light, timing full brightness, and detecting personnel actions from full darkness or lower power brightness to full brightness, or adjusting the control of brightness, it is often realized by complicated circuit technology. In particular, the driving of light emitting diodes is still a complex and high-cost technology.

The control of the brightness of various types of light sources, especially the lighting control of light-emitting diodes, for how to enhance the contrast of lighting brightness and color temperature, proposes a simple and effective method, which is the subject of the present invention.

Contents of the invention

The purpose of the present invention is to propose a two-level brightness LED safety monitoring lighting device, which can use the way of adjusting the current or light source load, and when it detects the movement of people in the energy-saving mode, it will immediately switch to the high-level brightness and last for a period of time to serve as a warning. Maintain low-level lighting to save energy when no human is detected.

The invention provides a two-stage light-emitting diode safety monitoring lighting device, which includes a power management unit, a photosensitive switch control unit, an action detection unit, a load and power control unit, and a light-emitting unit. The light-emitting unit includes one or more a series of light-emitting diodes; when the photosensitive switch control unit detects that the ambient brightness is lower than a preset value, the load and power control unit turns on the light-emitting unit, so that the light-emitting unit produces a high-order or a low-order brightness; When the photosensitive switch control unit detects that the ambient brightness is higher than the preset value, the load and power control unit turns off the light-emitting unit; The current flowing through the light-emitting unit is increased, so that the light-emitting unit produces a high-level brightness for a preset period of time.

The present invention also provides a two-stage light-emitting diode safety monitoring lighting device, which includes a power management unit, a photosensitive switch control unit, a motion detection unit, a load and power control unit, and a light-emitting unit. The light-emitting unit includes a plurality of When the light-sensitive switch control unit detects that the ambient brightness is lower than a preset value, the load and power control unit turns on all or part of the light-emitting diodes in the light-emitting unit, so that the light-emitting unit generates a high-level or A low-level brightness; when the photosensitive switch control unit detects that the ambient brightness is higher than the preset value, the load and power control unit turns off all the light-emitting diodes in the light-emitting unit; in energy-saving mode, when the action detection unit detects When people move, the load and power control unit turns on all the light-emitting diodes in the light-emitting unit, so that the light-emitting unit generates a high-level brightness and lasts for a preset period of time; in this embodiment, a constant current control circuit is combined, The light-emitting diodes in the light-emitting unit are driven with a fixed direct current.

The present invention also provides a two-stage light-emitting diode safety monitoring lighting device, which includes a power management unit, a photosensitive switch control unit, a motion detection unit, a load and power control unit, and a light-emitting unit. The light-emitting unit includes a phase An angle controller and one or more parallel AC light sources, the phase angle controller is coupled between the one or more parallel AC light sources and the AC power supply; wherein, the load and power control unit passes through the phase angle controller Adjust the average electric power of the light-emitting unit; when the photosensitive switch control unit detects that the ambient brightness is lower than a preset value, the load and power control unit turns on the light-emitting unit, so that the light-emitting unit generates a high-order or a low-order Brightness; when the photosensitive switch control unit detects that the ambient brightness is higher than the preset value, the load and power control unit turns off the light-emitting unit; The power control unit increases the average electric power of the light-emitting unit, so that the light-emitting unit produces a high-order brightness for a preset period of time.

The present invention also proposes a two-stage light-emitting diode safety monitoring lighting device, which includes a power management unit, a photosensitive switch control unit, a motion detection unit, a load and power control unit, and a light-emitting unit. The light-emitting unit consists of X A high-wattage AC light-emitting diode and Y low-wattage AC light-emitting diodes are connected in parallel. When the photosensitive switch control unit detects that the ambient brightness is lower than a preset value, the load and power control unit turns on these low-wattage AC light-emitting diodes. number of AC light-emitting diodes, so that the light-emitting unit produces a low-level brightness; when the photosensitive switch control unit detects that the ambient brightness is higher than the preset value, the load and power control unit turns off the light-emitting unit; when the motion detection unit When an intrusion is detected, the load and power control unit turns on the high-wattage LEDs and the low-wattage LEDs at the same time, so that the light-emitting unit generates a high-level brightness for a preset period of time, wherein X and Y are positive integers.

The present invention also proposes a two-stage light-emitting diode safety monitoring lighting device, which includes a power management unit, a photosensitive switch control unit, a motion detection unit, a load and power control unit, and a light-emitting unit. The light-emitting unit includes a rectifier circuit and one or more parallel AC light sources, the rectifier circuit is coupled between the AC light source and the AC power supply; wherein, the load and power control unit adjusts the average electric power of the light emitting unit through the rectifier circuit; when the photosensitive switch When the control unit detects that the ambient brightness is lower than a preset value, the load and power control unit turns on the light emitting unit to make the light emitting unit generate a low-level brightness; when the photosensitive switch control unit detects that the ambient brightness is higher than the preset value value, the load and power control unit turns off the light-emitting unit; when the action detection unit detects an intrusion, the load and power control unit increases the average electric power of the light-emitting unit, so that the light-emitting unit produces a high-level brightness and Lasting for a preset time, wherein the rectification circuit includes a switch and a diode connected in parallel, and the switch is controlled by the load and power control unit.

To sum up, the two-stage brightness LED safety monitoring lighting device provided by the embodiment of the present invention can implement light control and energy saving working modes. In the light control mode, the lighting will be turned on automatically when it gets dark, and the lighting will be turned off automatically at dawn. The light control mode first generates high-level brightness lighting for a set period of time, and then automatically switches to an energy-saving mode that generates low-level brightness lighting through the control unit. In energy-saving mode, when the motion detector detects a person, the lighting device will immediately switch to high-level brightness and maintain a short preset time to achieve the effect of lighting or warning. After a preset time, the lighting device will automatically switch back to low-level lighting to save energy.

In order to enable a further understanding of the features and technical content of the present invention, please refer to the following detailed description and accompanying drawings of the present invention, but these descriptions and accompanying drawings are only used to illustrate the present invention, rather than claiming the rights of the present invention any limitations on the scope.

Description of drawings

Fig. 1 is a circuit structure diagram of a two-stage LED security monitoring lighting device according to the first embodiment of the present invention.

FIG. 2A is a schematic circuit diagram of a two-stage LED security monitoring lighting device according to the first embodiment of the present invention.

FIG. 2B is a waveform diagram of the pulse width modulation signal PWM according to the first embodiment of the present invention.

3A is a schematic circuit diagram of a two-stage LED security monitoring lighting device according to a second embodiment of the present invention.

3B is a schematic circuit diagram of a two-stage LED security monitoring lighting device according to the second embodiment of the present invention.

4A is a schematic circuit diagram of a two-stage LED safety monitoring lighting device according to a third embodiment of the present invention.

FIG. 4B is a schematic waveform diagram of a two-stage LED security monitoring lighting device according to a third embodiment of the present invention.

FIG. 5 is a schematic circuit diagram of a two-stage LED safety monitoring lighting device according to a third embodiment of the present invention.

FIG. 6 is a schematic circuit diagram of a two-stage LED safety monitoring lighting device according to a fourth embodiment of the present invention.

FIG. 7 is a schematic circuit diagram of a two-stage LED safety monitoring lighting device according to a fifth embodiment of the present invention.

Wherein, the reference signs are explained as follows:

100: Two-stage light-emitting diode safety monitoring lighting device;

110: power management unit;

120: photosensitive switch control unit;

130: action detection unit;

140: load and power control unit;

150, 250, 350, 450, 550, 650, 750: light emitting unit;

220: light sensor;

230: motion detector;

240: microcontroller;

260: time setting unit;

L1～L3: Light-emitting diodes;

ACLED, ACLED1~3: AC light-emitting diodes;

451, 551: phase angle controller;

452, 552, 553: thyristor;

651, 652, 751～753: switch;

Q1, Q2, Q4, Q5: Transistors

R, R1, R2, R16, R17: resistance;

GND: ground terminal;

J1, J2: relays.

detailed description

(first embodiment)

Referring to FIG. 1 , it shows a circuit structure diagram of a two-stage LED safety monitoring lighting device according to the first embodiment of the present invention. The two-stage LED safety monitoring lighting device (lighting device for short) 100 includes a power management unit 110 , a photosensitive switch control unit 120 , an action detection unit 130 , a load and power control unit 140 and a light emitting unit 150 . The power management unit 110 is used to provide power required for system operation, and its structure includes, for example, an existing AC/DC voltage converter (AC/DC voltage converter). The photosensitive switch control unit 120 is, for example, a photoresistor, which is coupled to the load and power control unit 140 for detecting ambient brightness to determine day or night. The action detection unit 130 is, for example, a passive infrared sensor (Passive Infrared Sensor, PIR), which is coupled to the load and power control unit 140 and used to detect whether someone enters. When someone enters the detection range of the motion detection unit 130 , the motion detection unit 130 will send a detection signal to the load and power control unit 140 .

The load and power control unit 140 can be realized by a microcontroller, which is coupled to the light emitting unit 150 and can control the brightness of the light emitting unit 150 according to the detection signals of the photosensitive switch control unit 120 and the motion detection unit 130 . The light emitting unit 150 may include a plurality of light emitting diodes and switching elements. The load and power control unit 140 can control the light emitting unit 150 to produce at least two kinds of brightness changes.

In this embodiment, when the photosensitive switch control unit 120 detects that the ambient brightness is lower than the preset value (it is dark), the load and power control unit 140 executes the light control mode, turns on the light-emitting unit 150, and makes the light-emitting unit 150 generate high-level light. Brightness, after a preset time, switch to the energy-saving mode of low-level brightness. When the photosensitive switch control unit 120 detects that the ambient brightness is higher than a preset value (dawn), the load and power control unit 140 will turn off the light emitting unit 150 . In the energy-saving mode, when the motion detection unit 130 detects the movement of people, the load and power control unit 140 increases the current flowing through the light-emitting unit 150 to make the light-emitting unit 150 generate high-order brightness for a short preset time. After a short preset time, the current flowing through the light emitting unit 150 is automatically reduced, so that the light emitting unit 150 produces low-level brightness to save energy.

Please refer to FIG. 2A , which is a schematic circuit diagram of the lighting device 100 according to the first embodiment of the present invention. The photosensitive switch control unit 120 is realized by a light sensor 220 ; the motion detection unit 130 is realized by a motion detector 230 ; the load and power control unit 140 is realized by a microcontroller 240 . The light emitting unit 250 includes three light emitting diodes L1 - L3 connected in series. The LEDs L1 ˜ L3 are connected between a DC power source and the transistor Q1 , and the DC power source can be provided by the power management unit 110 . The transistor Q1 is an N-channel metal oxide semiconductor field effect transistor (NMOS). The transistor Q1 is connected between the three LEDs L1-L3 connected in series and the ground GND. The load and power control unit 140 is realized by the microcontroller 240 , which can output a pulse width modulation (PWM) signal to the gate of the transistor Q1 to control the average current conducted by the light emitting unit 250 . It should be noted that the above-mentioned components in FIG. 2A are only an embodiment of the present invention, and the present invention is not limited to the components in FIG. 2A .

Please also refer to FIG. 2B , which is a waveform diagram of the pulse width modulation signal PWM according to the first embodiment of the present invention. In the light control mode, the PWM signal causes the transistor Q1 to be turned on for a time T _on that is longer than the off time T _off . In the energy-saving mode, the PWM signal turns on the transistor Q1 for a time T _on that is shorter than the off time T _off . Comparing the lighting brightness of the two working modes, in the light control mode, because the time T _on of Q1 is turned on is long, the average current driving the light-emitting unit 250 is relatively high, so the brightness is relatively high, which belongs to high-order brightness; in the energy-saving mode , due to the short turn-on time T _on of Q1, the average current driving the light-emitting unit 250 is low, so the brightness is low, belonging to low-level brightness.

The microcontroller 240 will turn off the light-emitting unit 250 during the daytime, activate the light-control mode when it is dark, turn on the light-emitting unit 250, and switch to the energy-saving mode of low-level lighting after a period of time to generate high-level brightness. In the energy-saving mode, when the motion detector 230 detects a person, it will switch the light-emitting unit 250 to a high-level brightness to achieve the function of lighting or warning. After the light-emitting unit 250 maintains the high-level brightness for a short period of time, it will automatically switch to the low-level brightness to save energy.

In addition, the microcontroller 240 is coupled to a time setting unit 260. The time setting unit 260 allows the user to set the duration of the high-level brightness in the light control mode or the time of the full brightness mode. This embodiment does not Unlimited.

(second embodiment)

Referring again to FIG. 1 , the brightness change of the light emitting unit 150 can also generate at least two or more brightness levels by adjusting the number of light source loads turned on. In this embodiment, the lighting device 100 can generate low-order brightness and high-order brightness by turning on some or all of the LEDs.

Please also refer to FIG. 3A , which is a schematic circuit diagram of the lighting device 100 according to the second embodiment of the present invention. The main difference between FIG. 3A and FIG. 2A lies in the light emitting unit 350, which includes three light emitting diodes L1-L3 and NMOS transistors Q1, Q2. The LEDs L1 - L3 are connected in series with the transistor Q1 and connected between the DC power supply and the constant current control circuit 310 . In addition, the transistor Q2 is connected in parallel with both ends of the light emitting diodes L2 and L3. The gates of the transistors Q1 and Q2 are respectively connected to pins labeled PC and PS of the microcontroller 240 . In this embodiment, the constant current control circuit 310 limits the current driving the LEDs L1-L3 to a constant current, that is, L1-L3 emits light in a constant-current mode (Constant-Current Mode).

Referring to FIG. 3A , the PC pin of the microcontroller 240 controls the transistor Q1 to be turned on or off; when the PC pin is at a high potential or a low potential, Q1 is turned on or off respectively, which is used to turn on or off all the light emitting diodes L1-L3 . The PS pin of the microcontroller 240 controls the transistor Q2 to be turned on or off to form two current loops 351 and 352 on the light emitting unit 350 . When the PS pin of the microcontroller 240 is at a high potential, Q2 is turned on, and the current loop 351 passes through the light-emitting diode L1 and the transistor Q2; when the PS pin is at a low potential, Q2 is turned off, and the current loop 352 passes through all the light-emitting diodes L1-L3 . In this way, the microcontroller 240 can control the number of LEDs to be turned on through the transistor Q2 to generate high or low level brightness.

When the light sensor 220 detects that the ambient brightness is higher than the preset value, the microcontroller 240 sends a low potential voltage from the PC pin, the transistor Q1 is turned off and all the LEDs L1 - L3 in the light emitting unit 350 are turned off. When the light sensor 220 detects that the ambient brightness is lower than the preset value, the microcontroller 240 starts the light control mode, that is, a high potential voltage is sent from the PC pin and the PS pin is low, so that the transistor Q1 is turned on and the transistor Q1 Q2 is turned off, forming the current loop 352 shown in FIG. 3A , and turning on the three LEDs L1 - L3 in the light emitting unit 350 to generate high-level brightness. After the high-level brightness lasts for a preset period of time, the microcontroller 240 enters the energy-saving mode, that is, the PC pin maintains a high potential, but the PS pin sends a high potential voltage to turn on the transistor Q2, forming a current loop marked in FIG. 3A 351, so only a single LED L1 emits light, producing low-level brightness.

In the energy-saving mode, when the motion detector 230 detects a person’s motion, the PS pin of the microcontroller 240 is temporarily switched from a high potential to a low potential voltage, so that the transistor Q2 is temporarily cut off, forming a current loop 352, and turning on the light emitting unit 350 All the light-emitting diodes L1-L3 of the light-emitting unit 350 temporarily generate high-order brightness. Wherein, the light emitting unit 350 is driven by a constant current (constant value), so its brightness is directly proportional to the number of lighted LEDs. FIG. 3B is another implementation of FIG. 3A , in which the switching functions of NMOS transistors Q1 and Q2 are replaced by relays J1 and J2 . The microcontroller 240 controls the relays J2 and J1 by controlling NPN transistors (NPN bipolar junction transistor) Q4 and Q5 . Resistors R16 and R17 are current limiting resistors.

In the light control mode, the relay J1 pulls in, and the relay J2 pops open, and the constant current drives all the LEDs L1~L3 to generate high-level brightness; in the energy-saving mode, the relays J1 and J2 pull in, and the constant current only drives the LED L1 Generate low-level brightness, and when the action detector 230 detects a person's action, the PS pin of the microcontroller 240 is briefly switched from a high potential to a low potential voltage, causing the relay J2 to briefly pop open and then pull in again, resulting in a short high-level brightness.

In order to increase the contrast between high-level and low-order brightness, the light-emitting diode L1 can use a 2700K color temperature light-emitting diode, and the light-emitting diodes L2 and L3 can use a 5000K color temperature light-emitting diode. The light emitting unit 350 may include more than three light emitting diodes, such as five or six. Transistor Q2 can be relatively parallel connected to both ends of multiple light emitting diodes, so as to adjust the difference between high-level and low-level brightness. In addition, the light emitting unit 350 may also include a plurality of transistors Q2 respectively coupled to two ends of each light emitting diode to provide more options. The microcontroller 240 can determine the number of light-emitting diodes to be turned on in different situations according to design requirements. After the description of the above-mentioned embodiments, those skilled in the art should be able to deduce the implementation manner thereof, and details are not repeated here.

(third embodiment)

Referring again to FIG. 1 , the light emitting unit 150 may also include a phase angle controller and one or more parallel AC light emitting diodes, and the phase angle controller is coupled between the one or more parallel AC light emitting diodes and an AC power source. In this embodiment, the load and power control unit 140 can adjust the average electric power of the light emitting unit 150 through the phase angle controller, so as to generate changes in low-order brightness and high-order brightness.

Please refer to FIG. 4A , which is a schematic circuit diagram of a lighting device 100 according to a third embodiment of the present invention. The main difference between FIG. 4A and FIG. 3 is that the light source load of the lighting unit 450 is an AC LED coupled to an AC power supply, and the lighting unit 450 also includes a phase angle controller 451 . The phase angle controller 451 includes a thyristor 452 , a zero-crossing detection circuit 453 and a resistor R. When the light sensor 220 detects that the ambient brightness is higher than a preset value, the microcontroller 240 turns off the light emitting unit 450 . When the light sensor 220 detects that the ambient brightness is lower than a preset value, the microcontroller 240 activates the light control mode and turns on the light emitting unit 450 . In the light control mode, the microcontroller 240 selects a control pin to send a pulse signal through the resistor R to trigger the thyristor 452 to generate a large conduction phase angle, so that the light emitting unit 450 generates high-order brightness for a period of time. After the preset time, the same control pin sends a pulse signal of the energy-saving mode to trigger the thyristor 452 to generate a small conduction phase angle, so that the light-emitting unit 450 switches from a high-level brightness to a low-level energy-saving mode. In the energy-saving mode, when the action detection unit 230 detects a person’s action, the microcontroller 240 briefly sends a pulse signal of the light control mode through the same control pin to make the light-emitting unit 450 generate high-order brightness, and it will resume after a short period of time. Low level brightness.

In the lighting control of the AC light-emitting diode ACLED, the microcontroller 240 is combined with the zero-crossing detection circuit 453 to send a pulse signal synchronous with the AC power source through the detected zero-crossing time (for example, when the AC waveform passes through zero voltage) to trigger the phase angle The thyristor 452 in the controller 451 turns it on, thereby changing the average electric power input to the light emitting unit 450 . Because the AC light-emitting diode ACLED has a cut-in voltage V _t for starting conduction, if the pulse signal triggers the thyristor 452 to conduct it at an inaccurate time point, when the trigger pulse appears, the instantaneous value of the AC voltage is smaller than that of the AC light-emitting diode ACLED A cut-in voltage V _t may cause the AC LED to flicker or not to emit light. Therefore, the pulse signal generated by the microcontroller 240 must lag behind the zero-crossing point of the AC mains voltage sine wave by an appropriate time gap.

Assuming that the voltage amplitude of the AC power supply is V _m and the frequency is f, then for the light source load with the cut-in voltage V _t , the zero-crossing time gap t _D of the trigger pulse output by the microcontroller 240 must be limited within a range: t _o <t _D <1/(2f)–t _o . where t _o =(1/2πf)sin ⁻¹ (V _t /V _m ). This criterion is applicable to various types of AC light-emitting diodes to ensure that the SCR 452 can be triggered stably in both positive and negative half cycles of the AC power supply. Taking V _t (rms)=80V of an AC LED as an example, and assuming V _m (rms)=110V and f=60Hz, t _o =2.2ms and 1/(2f)=8.3ms are obtained. Therefore, the phase angle modulation pulse output by the microcontroller 240 must be designed within the range of _2.2ms <tD<6.1ms after the time gap t _D behind the zero-crossing point of the AC voltage sine wave.

Please refer to FIG. 4B . FIG. 4B is a schematic waveform diagram of a two-stage LED security monitoring lighting device according to a third embodiment of the present invention. Waveforms (a)-(d) in FIG. 4B respectively represent the voltage waveforms between the AC power supply, the zero-crossing detection circuit 453, the output pin of the zero-crossing delay pulse of the microcontroller 240, and the two terminals of the light-emitting unit 450. . The zero-crossing detection circuit 453 converts the AC voltage sine wave of the AC power supply, such as the small diagram (a) in Figure 4B, into a symmetrical square wave including a low and a high voltage value, as shown in the small diagram (b) in Figure 4B ). At the zero-crossing points of the AC voltage sine wave, the symmetrical square wave rises from a low voltage value to a high voltage value, or falls from a high voltage value to a low voltage value. That is, the edges of the symmetrical square wave correspond to the zero-crossing points of the AC voltage sine wave in timing. The microcontroller 240 generates a zero-crossing delay pulse relative to the zero-crossing point of the AC voltage sine wave according to the waveform output by the zero-crossing detection circuit 453 , as shown in the small diagram (c) in FIG. 4B . The zero-crossing delayed pulse lags behind the edge of the symmetrical square wave by a time gap t _D in timing. t _D must be within an effective range to ensure that the thyristor 452 can be triggered stably and turn on the AC light-emitting diode ACLED. The sub-graph (d) in FIG. 4B is the voltage waveform applied between the two ends of the AC LED. The brightness of the light-emitting unit 450 is related to the conduction period t _on of the AC LED, that is, the length of t _on is related to the input It is directly proportional to the average electric power to the AC LED. Comparing the difference between the light-control mode and the energy-saving mode, in the light-control mode, the AC LED has a longer conduction period t _on and emits high-order brightness; in the energy-saving mode, the conduction period t _on of the AC LED is shorter Short, low-level brightness is emitted.

Please refer to FIG. 5 , which is a schematic circuit diagram of a lighting device 100 according to a third embodiment of the present invention. The light emitting unit 550 of the lighting device 100 includes AC light emitting diodes ACLED1 and ACLED2 and a phase angle controller 551 . The phase angle controller includes thyristors 552 and 553, a zero-crossing detection circuit 554 and resistors R1 and R2. The difference between the light emitting unit 550 in FIG. 5 and the light emitting unit 450 in FIG. 4A is that the light emitting unit 550 has more than one AC light emitting diode and more than one thyristor, and the light emitting color temperature of the AC light emitting diode ACLED1 and AC LED2 can be selected to be different.

In the embodiment shown in FIG. 5 , the AC light emitting diode ACLED1 emits light with a high color temperature, and the AC light emitting diode ACLED2 emits light with a low color temperature. In the light control mode, the microcontroller 240 controls the conduction phase angle through the phase angle controller 551 and lights up the AC LEDs ACLED1 and ACLED2 at the same time, so that the light emitting unit 450 produces high-order brightness and mixed color temperature lighting. In the energy-saving mode, the microcontroller 240 controls the conduction phase angle through the phase angle controller 551 and only lights up the AC LED 2 , so that the light emitting unit 450 produces low-level brightness and low color temperature lighting. And in the energy-saving mode, when the action detector 230 detects a person's action, the microcontroller 240 controls the maximum conduction phase angle through the phase angle controller 551 and lights up the AC light-emitting diodes ACLED1 and ACLED2, so that the light-emitting unit 450 generates a high-order Brightness and high color temperature lighting, resulting in high brightness and high color tone contrast with warning function, and lasts for a short preset time. According to the lighting device, high-level or low-level brightness lighting can be generated, and the high-level brightness and low-level brightness lighting have different hues. The operating principles of other parts of the light emitting unit 550 are the same as those of the light emitting unit 450 , and will not be repeated here.

(fourth embodiment)

Please refer to FIG. 6 , which is a schematic circuit diagram of a lighting device 100 according to a fourth embodiment of the present invention. The light emitting unit 650 implements the light emitting unit 150 in FIG. 1 , and includes three AC light emitting diodes ACLED1-3 with the same light emitting power and switches 651 and 652 . Switches 651 and 652 may be relays. The AC LEDs ACLED1 and ACLED2 are connected in parallel and connected in series with the switch 652 to form a double-power light source, and then connected in parallel with the AC LED3 to form a triple-power light source, which is coupled to the AC power source through the switch 651 . In addition, the microcontroller 240 in FIG. 6 implements the load and power control unit 140 in FIG. 1 . Pins PC and PS of the microcontroller 240 are respectively coupled to the switches 651 and 652 , and the output voltage signals control the switches 651 and 652 to generate a short circuit or an open circuit respectively.

In the light control mode, the PC and PS pins of the microcontroller 240 control the switches 651 and 652 to short-circuit at the same time, and the AC light-emitting diodes ACLED1-3 are thus connected to the AC power supply, so that the light-emitting unit 650 produces high-order brightness with three times the power. After the high-level brightness lasts for a set period of time, the microcontroller 240 switches to the energy-saving mode, keeping the switch 651 in a short-circuit state, but the PS pin controls the switch 652 to be disconnected, and only the AC light-emitting diode ACLED3 is connected to the AC power source, so that the light-emitting unit 650 generates a Low-level brightness with twice the power. In the energy-saving mode, when the motion detector 230 detects the movement of people, the microcontroller 240 briefly activates the switch 652 to generate a short circuit, emits a high-order brightness of three times the power and lasts for a preset period of time, and then returns to the state of the switch 652 being disconnected , emitting low-order brightness with double the power. The lighting device of FIG. 6 is therefore capable of producing two-stage lighting with at least a 3:1 brightness contrast via the control switches 651 and 652 in a simple manner.

The AC LEDs ACLED1 and ACLED2 in Figure 6 can be light sources with high luminous power and 5000K color temperature, and the AC LED3 is a light source with low luminous power and 2700K color temperature, so there is no need to use a zero-crossing detection circuit, and two stages are generated from the AC light-emitting diodes. Lighting, which has a stronger brightness and color temperature contrast.

(fifth embodiment)

Referring to FIG. 7 , it is a schematic circuit diagram of a lighting device 100 according to a fifth embodiment of the present invention. The difference between the light emitting unit 750 in FIG. 7 and the light emitting unit 650 in FIG. 6 is that the AC light emitting diode ACLED3 is connected to a rectifier diode D in series. The rectifier diode D is connected in parallel with the switch 753 and is connected between the AC light emitting diode ACLED3 and the switch 751 . When the switch 753 is turned on, the AC power passing through the AC LED3 has a full waveform. When the switch 753 is disconnected, the AC power through the AC LED3 is rectified by the rectifier diode D and becomes a positive half waveform, and the luminous power of the AC LED3 remains half.

The switch 753 and the switch 752 are also controlled by the PS pin of the microcontroller 240 to generate a short circuit or an open circuit synchronously. If the luminous power of the three AC LEDs ACLED1-3 is the same, in the light control mode, the PC and PS pins of the microcontroller 240 control the switch 751 and the switches 752-753 to generate a short circuit at the same time, and the AC LED1-3 emit light at the same time , so that the light-emitting unit 750 can generate high-order brightness three times the power of a single light-emitting diode. In the energy-saving mode, the microcontroller 240 keeps the switch 751 short-circuited, but controls the switches 752 and 753 to be open-circuited. At this time, only the AC light-emitting diode ACLED3 will emit light. Because the AC power supply is rectified by the rectifier diode D, only the positive half-wave waveform remains, so the luminous power of the AC light-emitting diode ACLED3 is only half of that in the unrectified state. Under the high-level brightness, the AC LEDs ACLED1-3 will be fully bright, while under the low-level brightness, only the AC LED3 will produce half the brightness of the power. Comparing the high-level brightness and low-level brightness, the ratio of the luminous power is 6 to 1, so it can produce a very strong brightness contrast to achieve the effect of warning intruders.

It should be noted that in the fifth embodiment, the light emitting unit is not limited to the AC light emitting diode, and the light emitting unit may be an AC light source such as an AC light emitting diode, an incandescent lamp, or a fluorescent lamp.

According to the five embodiments of the present invention, a type of lighting device is realized with a simple driving circuit by using a plurality of light emitting diodes combined with a microcontroller and various detection elements. When the ambient brightness is insufficient, high-brightness lighting can be automatically activated, and then switched to low-brightness lighting at regular intervals. In addition, when someone enters the detection area, the lighting device can switch from low brightness to high brightness lighting to provide sufficient lighting for personnel, or produce strong brightness and color temperature contrast to monitor intruders.

The above descriptions are only examples of the present invention, which are not intended to limit the patent scope of the present invention.

Claims (10)

1. A two-stage light-emitting diode safety monitoring lighting device, characterized in that it includes a power management unit, a photosensitive switch control unit, a motion detection unit, a load and power control unit, a zero-crossing detection circuit and a light-emitting unit, the lighting unit includes at least one phase angle controller and at least one AC light source, the phase angle controller is connected to the AC power source in series with the AC light source; wherein, the load and power control unit includes a micro The controller is programmed to control the conduction time of the phase angle controller, so as to adjust the average electric power of the light-emitting unit; when the photosensitive switch control unit detects that the ambient brightness is lower than a preset value, the The load and power control unit turns on the light emitting unit to make the light emitting unit generate a low-level brightness; when the photosensitive switch control unit detects that the ambient brightness is higher than the preset value, the load and power control unit Turn off the light-emitting unit; when the action detection unit detects an intrusion, the load and power control unit increases the average electric power of the light-emitting unit, so that the light-emitting unit generates a high-level brightness and lasts for a preset period time. 2. The two-stage light-emitting diode safety monitoring lighting device according to claim 1, wherein the AC light source is an AC light-emitting diode, and the phase angle controller includes a thyristor. 3. The two-stage light-emitting diode safety monitoring lighting device according to claim 1, wherein the conduction time of the phase angle controller is limited between t _o and 1/(2f)-t _o , wherein t _o =(1/2πf)sin ^-1 (V _t /V _m ), f is the frequency of the AC power supply, V _m is the voltage amplitude of the AC power supply, and V _t is the voltage required to turn on the light emitting unit minimum voltage value. 4. The two-stage light-emitting diode security monitoring lighting device according to claim 1, wherein the light-emitting unit comprises a plurality of AC light sources and an equal number of thyristors, which are connected to the AC power supply in parallel. 5. The two-stage light-emitting diode safety monitoring lighting device according to claim 1, wherein the microcontroller turns off the light-emitting unit during the daytime, and starts a light control mode when it is dark An energy-saving mode in which the light-emitting unit is turned on so that the light-emitting unit first generates the high-order brightness for a period of time and then switches to the low-order brightness for illumination. 6. The two-stage light-emitting diode security monitoring lighting device according to claim 5, characterized in that, in the energy-saving mode, when the motion detection unit detects a person, the light-emitting unit will switch to the High-level brightness for lighting or warning purposes. 7. The two-stage LED safety monitoring lighting device according to claim 5, characterized in that, in the light control mode, the microcontroller controls the conduction phase angle via the phase angle controller and at the same time All the light-emitting units are turned on, so that the light-emitting units generate the high-order brightness and mixed color temperature lighting. 8. The two-stage light-emitting diode safety monitoring lighting device according to claim 5, characterized in that, in the energy-saving mode, the microcontroller controls the conduction phase angle via the phase angle controller and only clicks A bright part of the light-emitting unit enables the light-emitting unit to generate the low-order brightness and low color temperature illumination. 9. The two-stage LED safety monitoring lighting device according to claim 5, wherein the microcontroller is coupled to a time setting unit, and the time setting unit can be used by the user to set The duration of the high-order brightness of the light-emitting unit in the light control mode, or the time of a full-brightness mode. 10. The two-stage light-emitting diode safety monitoring lighting device according to claim 1, characterized in that, the microcontroller is combined with the zero-crossing detection circuit to send out the communication with the detected zero-crossing time A pulse signal synchronous with the power supply to trigger the thyristor in the phase angle controller to turn on, thereby changing the average electric power input to the light emitting unit.