WO2023030535A1 - 一种led灯 - Google Patents

一种led灯 Download PDF

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Publication number
WO2023030535A1
WO2023030535A1 PCT/CN2022/117264 CN2022117264W WO2023030535A1 WO 2023030535 A1 WO2023030535 A1 WO 2023030535A1 CN 2022117264 W CN2022117264 W CN 2022117264W WO 2023030535 A1 WO2023030535 A1 WO 2023030535A1
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WIPO (PCT)
Prior art keywords
electrically connected
circuit
signal
power supply
led module
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Application number
PCT/CN2022/117264
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English (en)
French (fr)
Inventor
熊爱明
周林
Original Assignee
嘉兴山蒲照明电器有限公司
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Publication of WO2023030535A1 publication Critical patent/WO2023030535A1/zh

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/32—Pulse-control circuits
    • H05B45/325—Pulse-width modulation [PWM]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

Definitions

  • the present application relates to the field of LED lighting, in particular to an LED lamp.
  • the dimming depth of the driving circuit of the general LED lamp cannot meet the low illumination requirement (0.1%) required by the night light.
  • the purpose of the present application is to provide an LED lamp with auxiliary lighting function, such as afterglow lighting or night lighting, so as to solve the above problems.
  • the present application proposes an LED lamp, which is characterized in that it includes: a rectification circuit electrically connected to an external power supply for receiving an external power signal and performing rectification to generate a rectified signal; a filter circuit electrically connected to the rectification circuit , used to receive the rectified signal and perform filtering to generate a filtered signal; the driving circuit is electrically connected to the filtering circuit to receive the filtered signal and perform power conversion to generate a driving signal; An LED module, electrically connected to the driving circuit, for receiving the driving signal and lighting; an auxiliary power supply module, electrically connected to the filtering circuit, for receiving the filtered signal, and generating an auxiliary power supply signal; the mains power detection module is electrically connected to the external power supply to detect the state of the external power supply and output a mains power detection signal; the central processing unit: electrically connected to the auxiliary power supply module, using the auxiliary The power supply signal provides power, and is electrically connected to the commercial power detection module to receive the commercial power detection signal and output a first control signal and
  • the second LED module is turned off when the first LED module is turned on.
  • the second LED module lights up when the external power supply stops.
  • the central processing unit includes: a control circuit for performing logic control; and an energy storage circuit electrically connected to the control circuit and the second LED module for stopping the external power supply.
  • the supply provides power to the control circuit and the second LED module.
  • the central processing unit includes: a control circuit for performing logic control; a first energy storage unit electrically connected to the control circuit for providing power to the The control circuit provides power; and the second energy storage unit is electrically connected to the second LED module to provide power to the second LED module when the external power supply stops.
  • the central processing unit includes a control interface, and the control interface is configured to receive a dimming signal.
  • the brightness of the second LED module is lower than the brightness of the first LED module, and the second LED module is turned off after being turned on for a period of time.
  • the first energy storage circuit includes a first diode, a first resistor, a first capacitor and a second diode.
  • the anode of the first diode is electrically connected to the auxiliary power supply module.
  • the first pin of the first resistor is electrically connected to the cathode of the first diode.
  • the first pin of the first capacitor is electrically connected to the second pin of the first resistor, and the second pin is electrically connected to the common ground terminal.
  • the anode of the second diode is electrically connected to the second pin of the first resistor and the first pin of the first capacitor, and its cathode is electrically connected to the control circuit.
  • the second energy storage circuit includes a third diode, a second resistor, a second capacitor, and a fourth diode.
  • the anode of the third diode is electrically connected to the auxiliary power supply module.
  • the first pin of the second resistor is electrically connected to the cathode of the third diode.
  • the first pin of the second capacitor is electrically connected to the second pin of the second resistor, and the second pin is electrically connected to the common ground terminal.
  • the anode of the fourth diode is electrically connected to the second pin of the second resistor and the first pin of the second capacitor, and its cathode is electrically connected to the second LED module.
  • the central processing unit further includes a voltage regulator diode and a linear voltage regulator circuit.
  • the Zener diode has its anode electrically connected to the auxiliary power supply module, and its cathode electrically connected to the cathode of the second diode.
  • the linear voltage stabilizing circuit is electrically connected between the cathode of the voltage stabilizing diode and the control circuit to form one of the power supply paths of the control circuit.
  • the central processing unit further includes a delay turn-on circuit.
  • the delay conduction circuit is electrically connected between the auxiliary power supply module and the anode of the first diode, and is used to disconnect the current of the first diode when the LED lamp is initially started. path, so that the power provided by the auxiliary power supply module is provided to the rear end through the Zener diode.
  • the present application proposes an LED lamp, which is characterized in that it includes: a rectification circuit electrically connected to an external power supply for receiving an external power signal and performing rectification to generate a rectified signal; a filter circuit electrically connected to the rectification circuit , used to receive the rectified signal and perform filtering to generate a filtered signal; the first drive circuit is electrically connected to the filtering circuit to receive the filtered signal and perform power conversion to generate a first Driving signal; LED module, electrically connected to the first driving circuit, for receiving the first driving signal and lighting; second driving circuit, electrically connected to the LED module, for generating the second driving signal, to light up the LED module; an auxiliary power supply module, electrically connected to the filter circuit, to receive the filtered signal, and generate an auxiliary power signal; and: a central processing unit, electrically connected to the auxiliary The power supply module uses the auxiliary power supply signal VCC to provide power, is electrically connected to the first drive circuit, and is used for dimming by controlling the first drive signal output by the first drive
  • the first driving circuit is a BCUK type power conversion circuit.
  • the first driving circuit adjusts the brightness of the LED module by changing the current magnitude of the first driving signal outputted by the first driving circuit.
  • the second driving circuit adjusts the brightness of the LED module by changing the ratio of the time when the LED module is turned on and off.
  • the frequency of turning on and off of the LED module is greater than or equal to 80 Hz.
  • the central processing unit further includes a control interface for receiving an external control signal, and the external control signal is used for adjusting the brightness of the LED module.
  • control interface is an infrared receiving unit for receiving an infrared control signal
  • infrared control signal includes a dimming signal or other operation instructions
  • the dimming depth of the first driving circuit is 1%, and the dimming depth of the second driving circuit is 0.1%.
  • the first driving circuit includes a diode, an inductor, a first transistor and a driving control circuit.
  • the first pin of the inductor is electrically connected to the anode of the diode, and the second pin is electrically connected to the cathode of the LED module.
  • the first pin of the first transistor is electrically connected to the anode of the diode and the first pin of the inductor, and the second pin is electrically connected to the common ground.
  • the drive control circuit is electrically connected to the control pin of the first transistor and the central processing unit, and is used to control the conduction state of the first transistor.
  • the second driving circuit includes a resistor and a second transistor.
  • the first pin of the resistor is electrically connected to the cathode of the LED module and the second pin of the inductor.
  • the first pin of the second transistor is electrically connected to the second pin of the resistor, the second pin is electrically connected to the common ground terminal, and its control pin is electrically connected to the central processing unit.
  • the LED module includes a first LED unit with a first color temperature and a second LED unit with a second color temperature, wherein the LED lamp further includes a color temperature adjustment unit.
  • the color temperature adjustment unit is used to respectively control the magnitude of the current passing through the first LED unit and the second LED unit.
  • the color temperature adjustment unit includes a first transistor and a second transistor.
  • the first transistor is connected in series with the first LED unit and is controlled by the first PWM signal provided by the central processing unit.
  • the second transistor is connected in series with the second LED unit and is controlled by the second PWM signal provided by the central processing unit.
  • the first PWM signal and the second PWM signal are complementary signals, and the sum of duty ratios of the first PWM signal and the second PWM signal is 100%.
  • the LED lamp can turn on the afterglow lighting after the main lighting is turned off, so as to provide a low-light lighting environment.
  • the first driving circuit turns on the LED module for normal lighting
  • the second driving circuit turns on the LED module for night light lighting.
  • the dimming depth of the night light can reach 0.1%, which meets the low-light requirements of night lighting without affecting people's sleep.
  • FIG. 1 is a schematic circuit block diagram of an LED lamp according to an embodiment of the present disclosure
  • FIG. 2 is a schematic circuit block diagram of a central processing unit 550 according to an embodiment of the present application
  • FIG. 3 is a schematic circuit block diagram of a central processing unit according to another embodiment of the present application.
  • FIG. 4 is a schematic diagram of a circuit structure of a central processing unit according to an embodiment of the present application.
  • FIG. 5 is a schematic diagram of a circuit structure of a central processing unit according to another embodiment of the present application.
  • FIG. 6 is a schematic diagram of a circuit structure of a central processing unit according to another embodiment of the present application.
  • FIG. 7 is a schematic circuit diagram of a central processing unit according to another embodiment of the present application.
  • FIG. 8 is a schematic diagram of a circuit structure of a central processing unit according to another embodiment of the present application.
  • FIG. 9 is a schematic diagram of a circuit structure of a delay turn-on circuit according to an embodiment of the present application.
  • FIG. 10 is a schematic circuit block diagram of an LED lamp according to yet another embodiment of the present application.
  • FIG. 11 is a schematic circuit structure diagram of a first driving circuit and a second driving circuit according to an embodiment of the present application.
  • FIG. 12 is a schematic diagram of a circuit structure of an LED module 50 according to an embodiment of the present application.
  • FIG. 13 is a schematic diagram of signal waveforms of PWM1 and PWM2 according to an embodiment of the present application; and FIG. 14 is a schematic diagram of a light-emitting area of a circular ceiling lamp according to an embodiment of the present application.
  • a single resistor in the schematic circuit diagram can be equivalently replaced in an actual circuit by multiple resistors connected in series or in parallel, and the present invention is not limited thereto.
  • the capacitor can also be equivalently replaced by multiple capacitors connected in series or in parallel.
  • the LED lamp 5 includes a rectifier circuit 510 , a filter circuit 520 , a drive circuit 530 , a first LED module 50 , a second LED module 51 , an auxiliary power supply module 540 , a commercial power detection module 560 , and a central processing unit 550 .
  • the rectification circuit 510 is electrically connected to the external power supply EP for receiving and rectifying the external power signal, and converting the received AC signal into a DC signal to generate a rectified signal.
  • the filtering circuit 520 is electrically connected to the rectifying circuit 510 for receiving the rectified signal and performing filtering to generate a filtered signal.
  • the driving circuit 530 is electrically connected to the filter circuit 520 for receiving the filtered signal and performing power conversion to generate a driving signal, and the driving signal is a DC signal.
  • the first LED module 50 is electrically connected to the driving circuit 530 for receiving the driving signal to light up.
  • the first LED module includes at least one light emitting diode.
  • the auxiliary power module 540 is electrically connected to the filter circuit 520 for receiving the filtered signal and performing power conversion to generate an auxiliary power signal VCC, which is a constant voltage DC signal.
  • the auxiliary power signal VCC is used to provide power for the CPU 550 .
  • the mains power detection module 560 is electrically connected to the external power supply to detect the external power signal and generate a mains power detection signal.
  • Power supply when the peak voltage of the external power signal is greater than or equal to the set threshold, the commercial power detection module 560 determines that the external power supply has power supply.
  • the commercial power detection signal is used to indicate the state of the external power supply. When the external power supply has power supply, the commercial power detection signal is high level; when the external power supply has no power supply, the commercial power detection signal is low power. flat.
  • the central processing unit 550 is electrically connected to the commercial power detection module 560 , the driving circuit 530 and the second LED module 51 for receiving the commercial power detection signal and outputting a first control signal and a second control signal.
  • the first control signal is used to transmit to the driving circuit 530 for adjusting the current of the driving signal by controlling the driving circuit 530 .
  • the brightness of the first LED module 50 is related to its current, and the first LED module 50 can be dimmed by adjusting the current flowing through the first LED lamp module 50 .
  • the second control signal is used to transmit to the second LED module 51 to control the working state of the second LED module under different circuit states. For example, when there is no power supply from the external power supply and the mains power detection signal is at low level, the processing unit 530 outputs a second control signal through logic operation to lighten the second LED module 51 .
  • the central processing unit 550 includes a control interface for receiving dimming signals or other control signals.
  • the dimming signal may be transmitted to the central processing unit 550 in a wired or wireless manner, and the present application is not limited thereto.
  • the dimming signal may be, for example, a 0-10V dimming signal, an infrared remote control dimming signal, a PWM dimming signal, and the like.
  • the second LED module 51 is electrically connected to the central processing unit 550 for receiving the second control signal to turn on/off.
  • the first LED module 50 is a main lighting device, which is mainly used for lighting under normal conditions, and the second LED module is an auxiliary lighting device, which is used for providing lighting under special conditions.
  • the usage scenarios of the second LED module 51 will be briefly described below.
  • the first LED module 50 when the first LED module 50 is extinguished, the whole environment suddenly changes from bright to dark, and people cannot continue activities in the dark environment, and the dark environment is likely to have a negative impact on people's psychology.
  • the second LED module when the first LED module 50 is turned off, the second LED module is turned on, so as to provide sufficient lighting brightness for activities.
  • the brightness of the second LED module 51 is lower than the brightness of the first LED module 50, so that the user can clearly perceive that the main lighting device has been turned off, and the auxiliary lighting device is turned on;
  • the change has a process of gradual adaptation, which reduces the psychological pressure of users.
  • the same technical effect can be achieved by making the color of the second LED module different from that of the first LED module, and the present invention is not limited thereto.
  • Auxiliary lighting may also be referred to as afterglow lighting.
  • the afterglow lighting function can be turned on or off through the control interface. When the afterglow function is turned on, after the first LED module 50 is extinguished, the second LED module 51 is lit under the control of the second control signal; when the afterglow function is turned off, after the first LED module 50 is extinguished, the second LED module 51 It is not lit under the control of the second control signal. In this usage scenario, the second LED module is automatically turned off after being turned on for a period of time.
  • the mains power detection module 560 judges that the mains power is cut off, and the central processing unit 550 receives the mains power detection signal, and outputs a second control signal to the second LED module 51, so that the second LED module 51 The module 51 lights up to provide auxiliary lighting after the utility power is cut off.
  • the afterglow lighting function in this scenario cannot be turned off, that is, when the mains power is cut off, the second LED module 51 lights up .
  • the central processing unit 550 includes a control circuit 551 and a first energy storage circuit 552 .
  • the first energy storage circuit 552 is electrically connected to the auxiliary power supply module 540 , the control circuit 551 and the second LED module 51 .
  • the first energy storage circuit 552 receives the auxiliary power supply signal VCC output by the auxiliary power supply module 540, and stores part of the electric energy.
  • the external power supply stops supplying power to the LED lamp 5, that is, the auxiliary power supply module 540 stops outputting the auxiliary power supply signal VCC.
  • the second An energy storage circuit 552 releases its stored electric energy to the control circuit 551 and the second LED module 51 .
  • the control circuit 551 is electrically connected to the second LED module 51 for controlling the turning on/off of the second LED module 51 .
  • the first energy storage circuit 552 provides power to the control circuit 551 and the second LED module 51 at the same time when the external power supply stops power supply.
  • the central processing unit 550 includes a control circuit 551 , a first energy storage circuit 552 and a second energy storage circuit 553 .
  • the first energy storage circuit 552 is electrically connected to the auxiliary power supply module 540 for receiving the auxiliary power supply signal VCC and storing part of the electric energy.
  • the second energy storage circuit 553 is electrically connected to the auxiliary power supply module 540 for receiving the auxiliary power supply signal VCC and storing part of the electric energy.
  • the first energy storage circuit 552 is electrically connected to the control circuit 551 for providing power to the control circuit 51 when the external power supply stops supplying power.
  • the second energy storage circuit 553 is electrically connected to the second LED module 51 for providing power to the second LED module 51 when the external power supply stops supplying power.
  • the central processing unit 550 in this embodiment is similar to the embodiment described in FIG. 2 . The difference is that in the embodiment described in FIG. 2 , the control circuit 551 and the second LED module 51 use the same energy storage circuit. In an embodiment, the control circuit 551 and the second LED module use different energy storage circuits. Through this configuration, the first energy storage circuit 552 supplies power to the control circuit 551, and the second energy storage circuit 553 supplies power to the second LED module 51, which can reduce the mutual influence between the control circuit 551 and the second LED module 51, Make the circuit more stable.
  • FIG. 4 it is a schematic diagram of a circuit structure of a central processing unit according to an embodiment of the present application.
  • the circuit structure of the central processing unit in this embodiment is a lower-level expansion of the embodiment shown in FIG. 2
  • the central processing unit 550 includes a control circuit 551 and a first energy storage circuit 552 .
  • the first energy storage circuit 552 includes diodes D1, D2, a resistor R1 and a capacitor C1.
  • the anode of the diode D1 is electrically connected to the auxiliary power supply module 540 (VCC), and the cathode thereof is electrically connected to the first pin of the resistor R1.
  • VCC auxiliary power supply module
  • the second pin of the resistor R1 is electrically connected to the anode of the diode D2 and the first pin of the capacitor C1.
  • the second pin of the capacitor C1 is electrically connected to the common ground terminal GND.
  • the cathode of the diode D2 is electrically connected to the control circuit 551 .
  • the second LED module 51 includes a light emitting diode D3, a resistor R2 and a transistor Q1.
  • the anode of the light-emitting diode D3 is electrically connected to the cathode of the diode D2, the cathode thereof is electrically connected to the first pin of the resistor R2, the second pin of the resistor R2 is electrically connected to the first pin of the transistor Q1, and the transistor Q1
  • the second pin is electrically connected to the common ground GND, and the third pin of the transistor Q1 is electrically connected to the control circuit 551 .
  • the auxiliary power supply module 540 provides an auxiliary power supply signal VCC, and the auxiliary power supply signal VCC charges the capacitor C1 through the resistor R1, the voltage at both ends of the capacitor C1 gradually increases, and the stored energy also gradually increases.
  • the capacitor C1 provides power for the control circuit 551 and the second LED module 51 by releasing its stored electric energy.
  • the control circuit 551 outputs a second control signal through the third pin of the transistor Q1 to control the transistor Q1 to be turned on, and the LED D3 is turned on.
  • the light-emitting diode D3 may be replaced by an LED light-emitting unit, and the LED light-emitting unit is formed by connecting multiple light-emitting diodes in series and/or in parallel, and the present application is not limited thereto.
  • FIG. 5 it is a schematic diagram of a circuit structure of a central processing unit according to another embodiment of the present application.
  • the circuit structure of the central processing unit in this embodiment is a lower-level expansion of the embodiment shown in FIG. 3 .
  • the central processing unit 550 includes a control circuit 551 , a first energy storage circuit 552 and a second energy storage circuit 553 .
  • the first energy storage circuit 552 includes diodes D1 and D2 , a resistor R1 and a capacitor C1 .
  • the second energy storage circuit 554 includes diodes D4 and D5, a resistor R3 and a capacitor C2.
  • the second LED module 51 includes a light emitting diode D3, a resistor R2 and a transistor Q1.
  • the anode of the diode D1 is electrically connected to the auxiliary power supply module 540 (VCC), and the cathode thereof is electrically connected to the first pin of the resistor R1.
  • the second pin of the resistor R1 is electrically connected to the anode of the diode D2 and the first pin of the capacitor C1.
  • the second pin of the capacitor C1 is electrically connected to the common ground terminal GND.
  • the cathode of the diode D2 is electrically connected to the control circuit 551 .
  • An anode of the diode D4 is electrically connected to the auxiliary power supply module 540 , and a cathode thereof is electrically connected to the first pin of the resistor 3 .
  • the second pin of the resistor R3 is electrically connected to the anode of the diode D5 and the first pin of the capacitor C2.
  • the second pin of the capacitor C2 is electrically connected to the common ground terminal GND.
  • the cathode of the diode D5 is electrically connected to the anode of the LED D3.
  • the cathode of the LED D3 is electrically connected to the first pin of the resistor R2, the second pin of the resistor R2 is electrically connected to the first pin of the transistor Q1, and the second pin of the transistor Q1 is electrically connected to the common ground. GND, the third pin of the transistor Q1 is electrically connected to the control circuit 551 .
  • the central processing unit 550 further includes a second energy storage circuit 553 .
  • the first energy storage circuit 552 is electrically connected to the control circuit 551 for providing power to the control unit 551 when the external power supply stops supplying power.
  • the second energy storage circuit 553 is electrically connected to the second LED module 51 for providing power to the second LED module 51 when the external power supply stops supplying power.
  • control circuit 551 and the second LED module 51 are electrically connected to the first energy storage circuit 552 at the same time.
  • the first energy storage circuit 552 provides power for the second LED modules 51 of the control circuit 551 at the same time;
  • the second energy storage circuit 553 provides power for the second LED module 51 .
  • the auxiliary power signal VCC when the LED lamp is powered on, the auxiliary power signal VCC first charges the capacitor C1, and when the voltage of C1 rises to the rated voltage of the control circuit 551, the control circuit starts and the LED lamp works normally. Only using the first energy storage circuit, in order to maintain a longer working time of the second LED module after the system is powered off, will inevitably cause the capacitance of the capacitor C1 to be selected with a larger capacitance.
  • the first energy storage circuit 552 and the second energy storage circuit 553 are used to supply power to the control circuit 551 and the second LED module respectively.
  • the capacitor C1 can be selected with a smaller value, and the charging time of the capacitor C1 is shorter. After power-on, the control circuit 551 can be started in a short time, and the start-up time of the LED lamp will also be shortened.
  • FIG. 6 it is a schematic circuit diagram of a central processing unit according to another embodiment of the present application.
  • the circuit structure of the central processing unit 550 is similar to that of the embodiment shown in FIG. 4 .
  • the central processing unit 550 further includes a linear voltage regulator circuit 554 and a diode D6.
  • An anode of the diode D1 is electrically connected to the auxiliary power supply module 540 , and a cathode thereof is electrically connected to the first pin of the resistor R1 .
  • the second pin of the resistor R1 is electrically connected to the anode of the diode D2 and the first pin of the capacitor C2.
  • the second pin of the capacitor C1 is electrically connected to the common ground terminal GND.
  • the cathode of the diode D2 is electrically connected to the cathode and anode of the LED D3.
  • the anode of the diode D6 is electrically connected to the anode of the diode D1, and the cathode thereof is electrically connected to the cathode of the diode D2.
  • the linear regulator circuit 554 is electrically connected to the cathode of the diode D6 and the control circuit 551 .
  • the circuit structure of the second LED module 51 is similar to that of the foregoing embodiments, and will not be repeated here.
  • the central processing unit includes a dual power supply architecture.
  • the first power supply is formed by the path formed by the diode D6 and the linear voltage regulator circuit 554
  • the second power supply is formed by the path formed by the first energy storage circuit 552 and the linear voltage regulator circuit 554 .
  • both the first power supply and the second power supply can provide power for the control circuit 551.
  • the first power supply formed by the first energy storage circuit 552 can provide power for the control circuit. electricity.
  • FIG. 7 it is a schematic circuit diagram of a central processing unit according to another embodiment of the present application.
  • the circuit structure of the central processing unit 550 in this embodiment is similar to the embodiment described in FIG. 6 , the difference is that in this embodiment, the central processing unit 550 further includes a delay turn-on circuit 555 .
  • the delay turn-on circuit 555 is electrically connected between the diode D1 and the auxiliary power supply module 540 .
  • the delay conduction circuit 555 is in the off state, and the auxiliary power signal VCC provides power for the control circuit through the diode D6 and the linear voltage regulator circuit 554.
  • the delay conduction circuit 555 When turned on, the auxiliary power signal VCC charges the capacitor C1 through the capacitor R1.
  • the control circuit 551 first obtains power and works normally, and after time t1, the auxiliary power signal VCC charges the first energy storage circuit 552 . LED light can get faster startup speed.
  • t1 can be set by modifying device parameters of the delay turn-on circuit 555 .
  • FIG. 8 it is a schematic diagram of a circuit structure of a central processing unit according to another embodiment of the present application.
  • the circuit structure of the central processing unit 550 of this embodiment is similar to that of the embodiment described in FIG. .
  • the delay turn-on circuit 556 is electrically connected between the second energy storage circuit and the auxiliary power supply module 540 .
  • the circuit structure of the second energy storage circuit 530 is the same as that of the embodiment described in FIG. 5 , and will not be repeated here.
  • the delay turn-on circuit 555 and the delay turn-on circuit 556 can respectively control the auxiliary power signal VCC to the first energy storage circuit 552 and the second energy storage circuit 553. charging time.
  • the delay conduction circuits 555 and 556 When the system is powered on, the delay conduction circuits 555 and 556 are in the off state, and the auxiliary power supply signal VCC first supplies power to the control circuit 551, so that the LED light starts and enters the working state. After time t1, the delay conduction circuit 555 is turned on, and the auxiliary power signal VCC charges the first energy storage circuit 552. After time t2, the delay conduction circuit 556 is turned on, and the auxiliary power signal VCC charges the first energy storage circuit 552. The second energy storage circuit 554 is charged.
  • the delay turn-on circuit 555 and 556 By setting the circuit parameters of the delay turn-on circuits 555 and 556, t1 ⁇ t2, when t1 ⁇ t2, the delay turn-on circuit 555 is first turned on, and when t1>t2, the delay turn-on circuit 556 is first turned on Pass.
  • control circuit 551 can first enter the normal working state when the system is powered on, reducing the startup time of the system. Make the first energy storage circuit 552 and the second energy storage circuit 553 delay entering the charging state, to prevent the auxiliary power signal VCC from affecting the control circuit 551 when charging the first energy storage circuit 552 and the second energy storage circuit 553, increasing The boot time of the system.
  • the delay turn-on circuit 555 includes a capacitor C3 , resistors R4 , R5 and a transistor Q2 .
  • the first pin of the capacitor C3 is electrically connected to the auxiliary power supply module 540, the first pin of the resistor R4 and the first pin of the transistor Q2, and the second pin of the capacitor C3 is electrically connected to the second pin of the resistor R4 , the first pin of the resistor R5 and the third pin of the transistor Q2.
  • the second pin of the resistor R5 is electrically connected to the common ground.
  • the second pin of the transistor Q2 is the output end of the delay turn-on circuit.
  • the working principle of the delay turn-on circuit 555 is described below. Let the voltage at the second pin of the resistor R4 be V1. When the system is powered on, since the voltage across the capacitor C3 cannot change abruptly, V1 gradually decreases from VCC to V2
  • V2 satisfies the relation:
  • V2 VCC*R5/(R4+R5)
  • the transistor Q2 is a PMOS, V2 ⁇ V GS, and V GS is the turn-on voltage of the transistor Q2.
  • the transistor Q2 When the condition V1 ⁇ V GS is satisfied, the transistor Q2 is turned on, and the power signal VCC can be transmitted to the output terminal Vout of the delay turn-on circuit through the transistor Q2.
  • the time interval t2 from power-on to turn-on of the transistor Q2 can be adjusted by controlling the parameters of the resistors R4, R5 and the capacitor C3.
  • (R4//R5) represents the resistance value after resistors R4 and R5 are connected in parallel, V GS ⁇ -3V.
  • the LED lamp has a first LED module and a second LED module, the first LED module is used for main lighting, and the second LED module is used to provide Short afterglow lighting, when the afterglow lighting is activated, the afterglow lighting can still be turned off or on through the control interface.
  • the LED lamp 5 includes a rectifying circuit 510 , a filter circuit 520 , a first driving circuit 530 , an LED module 50 , an auxiliary power supply module 540 , a central processing unit 550 and a second driving circuit 570 .
  • the rectified current 510 is electrically connected to the external power supply EP for receiving the external power signal and rectifying it to generate a rectified signal.
  • the filter circuit 520 is electrically connected to the rectification circuit 510 for receiving the rectified signal and performing filtering to generate a filtered signal.
  • the first driving circuit 530 is electrically connected to the filter circuit 520 for receiving the filtered signal and performing power conversion to generate the first driving signal.
  • the LED module 50 is electrically connected to the driving circuit 530 for receiving a first driving signal to light up.
  • the auxiliary power supply module 540 is electrically connected to the filter circuit 520 for receiving the filtered signal and performing power conversion to generate the auxiliary power signal VCC.
  • the central processing unit 550 is electrically connected to the auxiliary power supply module for supplying power using the auxiliary power signal VCC.
  • the central processing unit 550 is electrically connected to the first driving circuit 530 for dimming by controlling the first driving signal output by the first driving circuit 530 .
  • the central processing unit 550 is electrically connected to the second driving circuit 570 for adjusting the second driving signal output by the second driving circuit 570 .
  • the second driving circuit 570 is electrically connected to the LED module 50 for outputting a second driving signal to light the LED module 50 .
  • the first driving circuit 530 and the second driving circuit 570 are connected to the LED module 50 at the same time, and both can be used to light the LED module 50 .
  • the first drive circuit 530 is used as a main drive circuit for LED lighting under normal conditions
  • the second drive circuit 570 is a secondary drive circuit for low-light illumination at night.
  • the first driving circuit 530 is a BUCK type power conversion circuit, and its dimming depth is about 1%.
  • the low-illuminance requirement of the night light cannot be met, so in this embodiment, the second driving circuit 570 is used to drive the LED module 50 to be used as a night light.
  • the dimming depth of the second driving circuit 570 can reach 0.1%.
  • the auxiliary power signal VCC is a low voltage direct current signal.
  • the voltage range of the auxiliary power signal VCC is 3.3-30V.
  • the first driving circuit 530 drives the LED module 50 to be used as a main lighting
  • the second driving circuit 570 drives the LED module 50 to be used as a night light.
  • the night light uses the LED module 50 as a light-emitting unit, which can make the night light emit more uniform light.
  • FIG. 14 it is a schematic diagram of the light-emitting area of a circular ceiling lamp.
  • the LED units 50 are evenly arranged in the circular area, and in the normal lighting mode, the LED modules 50 are turned on.
  • one or several LED lamp beads are arranged in the square area 62. When the small night is lit, only the square area is lit, causing the entire luminous area to be uneven. If the technical solution of this embodiment is adopted, when the night light is turned on, the LED module 50 is turned on, and its light-emitting area is the same as that in the normal lighting mode, and the light-emitting area is more uniform.
  • the first driving circuit 530 includes a diode D7 , an inductor L1 , a transistor Q4 and a driving control circuit 531 .
  • the LED module 50 includes light emitting diodes D8, D9.
  • the second driving circuit 570 includes a transistor Q3 and a resistor R6.
  • the cathode of the diode D7 is electrically connected to the filter circuit 520 and the anode of the LED D8 , and its anode is electrically connected to the second pin of the transistor Q4 and the first pin of the inductor L1 .
  • the second pin of the inductor L1 is electrically connected to the cathode of the LED D9 and the first pin of the resistor R6.
  • the second pin of the transistor Q4 is electrically connected to the driving control circuit 531
  • the third pin of the transistor Q4 is electrically connected to the common ground terminal GND.
  • the second pin of the transistor Q3 is electrically connected to the common ground GND, and the third pin of the transistor Q3 is electrically connected to the central processing unit 550 .
  • the driving control circuit 531 is electrically connected to the central processing unit 550 .
  • the first driving circuit is a BCUK type power conversion circuit, which performs step-down conversion on the received filtered signal to generate the first driving signal for lighting the LED module 50, and the driving control circuit 531 controls the transistor Q4 The conduction duty ratio of the first driving signal is adjusted to adjust the brightness of the LED module 50 .
  • the first driving circuit 530 can adjust the brightness of the LED module 50 by adjusting the current of the first driving signal, the dimming depth of the first driving circuit 530 can only reach about 1%, which cannot satisfy the smaller dimming of the night light. Depth needs.
  • the load of the second driving circuit 530 is the same as that of the first driving circuit 530 , which is the LED module 50 .
  • the first driving circuit 530 does not work, that is, the transistor Q4 is in an off state.
  • the transistor Q3 is turned on, the current I flowing through the LED module 50 satisfies the following relationship:
  • V3 is the voltage of the filtered signal
  • V4 is the voltage across the LED module 50.
  • the central processing unit 550 controls the turn-on and cut-off of the transistor Q3 through the PWM signal.
  • the PWM signal is at a high level, the transistor Q3 is turned on, and the LED module 50 is lit; when the PWM signal is at a low level, the transistor Q3 is turned off, and the LED module extinguished, the ratio of lighting and extinguishing of the LED module can be adjusted by adjusting the duty ratio of the PWM signal, when the ratio of lighting becomes high, the brightness of the LED module 50 increases; when the ratio of lighting becomes low, The brightness of the LED module 50 decreases.
  • the frequency of the PWM signal is greater than or equal to 80 Hz, the human eye cannot perceive this flicker, and the LED module is considered to be always on.
  • the current I flowing through the LED module 50 satisfies the following relationship:
  • V3 is the voltage of the filtered signal
  • V4 is the voltage across the LED module 50
  • D1 is the duty ratio of the PWM signal, when the transistor Q3 is turned on, the voltage between the first pin and the second pin is The voltage is so small that it can be ignored.
  • the dimming depth of the LED module 50 can reach 0.1%, and the brightness of the night light can be reduced enough to meet the lighting requirements in different environments. For example, in a sleeping environment, adjusting the brightness of the night light to 0.1% can meet the basic lighting needs at night without affecting people's sleep.
  • the central processing unit 550 includes a control interface, and can send dimming signals or other operating instructions to the central processing unit through the control interface, for example, enabling or disabling the first driving circuit 530 and/or the second driving circuit 530
  • the circuit 570 uses the first driving circuit 530 to perform dimming, uses the second driving circuit 570 to perform dimming, and the like.
  • the central processing unit 550 includes a control interface, and the control interface is an infrared receiving unit for receiving an infrared control signal, and the infrared control signal includes a dimming signal or other operation instructions.
  • the LED module 50 is formed by connecting multiple light emitting diodes in series and/or in parallel, and the present invention is not limited thereto.
  • the LED module 50 includes a first LED unit 501 and a second LED unit 502 .
  • the first LED unit 501 includes light emitting diodes D8 and D9, and the second LED unit includes D10 and D11.
  • the LED lamp 5 further includes a color temperature adjustment unit 580, and the color temperature adjustment unit 580 includes transistors Q5 and Q6.
  • the anode of the light emitting diode D8 is electrically connected to the anode of the light emitting diode D10 and is electrically connected to the first driving circuit 530 .
  • the anode of the light emitting diode D9 is electrically connected to the cathode of the light emitting diode D8, and the cathode is electrically connected to the first pin of the transistor Q5.
  • the anode of the LED D11 is electrically connected to the cathode of the LED D10 , and the cathode is electrically connected to the first pin of the crystal light Q6 .
  • the second pin of the transistor Q5 is electrically connected to the CPU 550 , and the second pin of the transistor Q6 is electrically connected to the CPU 550 .
  • the third pin of the crystal light Q5 is electrically connected to the third pin of the transistor Q6 and is electrically connected to the first driving circuit 530 .
  • the principle of the color temperature adjustment of the LED lamp 5 will be described below.
  • the color temperature of the first LED unit 501 and the second LED unit 502 are different, and the color temperature of the LED lamp is adjusted by controlling the lighting time of the first LED unit 501 and the second LED unit 502 .
  • the central processing unit 550 controls the on and off of the transistors Q5 and Q6 through the PWM signal.
  • the transistors Q5 and Q6 are not turned on at the same time. Referring to FIG.
  • PWM1 is a PWM signal for the central processing unit 550 to control the transistor Q5
  • PWM2 is a PWM signal for the central processing unit to control the transistor Q6.
  • the PWM1 signal is at a high level
  • the transistor Q5 is turned on, and when the PWM1 signal is at a low level, the transistor Q5 is turned off; similarly, when the PWM2 signal is at a high level, the transistor Q6 is turned on, and when the PWM2 signal is at a low level, Transistor Q6 is off.
  • the frequencies of PWM1 and PWM2 are the same, and within a frequency cycle T1, when PWM1 is at high level, PWM2 is at low level.
  • the duty ratio of PWM1 becomes larger, the average current flowing through the first LED unit 501 becomes larger, and the brightness of the first LED unit 501 increases; at the same time, the duty ratio of PWM2 decreases, and the 502 flowing through the second LED unit As the average current decreases, the brightness of the second LED unit 502 decreases. Because the color temperature of the first LED unit 501 and the second LED unit 502 are different, when the brightness changes, the color temperature of the overall LED lamp changes.
  • the color temperature of the first LED unit 501 be 4000K
  • the color temperature of the second LED unit 502 be 6000K
  • the duty cycle of PWM1 100%
  • the duty cycle of PWM2 is 0%
  • the first LED The unit 501 is turned on
  • the second LED unit 502 is turned off
  • the color temperature of the whole lamp is 4000K.
  • the duty cycle of PWM1 is 0%
  • the duty cycle of PWM2 is 100%
  • the first LED unit 501 is off
  • the second LED unit 502 is on
  • the color temperature of the whole lamp is 6000K.
  • the duty cycle of PWM1 is 50%
  • the duty cycle of PWM2 is 50%
  • both the first LED unit 501 and the second LED unit 502 are on
  • the color temperature of the whole lamp is about 5000K.
  • the color temperature of the whole lamp can be changed by changing the duty cycle of PWM1.
  • the first drive circuit 530 and the second drive circuit 570 drive the LED module 50 to light up in different ways, the first drive circuit 530 drives the LED module 50 for daily lighting, and the second drive circuit 570 drives The LED module 50 is used as a night light for lighting.
  • the first driving circuit 530 and the second driving circuit 570 do not work at the same time.
  • the second driving circuit 570 can achieve a lower dimming depth (0.1% and below), so that the brightness of the night light is lower, and it does not affect people while meeting the basic lighting requirements at night. sleep.
  • the color temperature can also be adjusted.

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

一种具有辅助照明功能的LED灯。LED灯包含整流电路（510）、滤波电路（520）、驱动电路（530）、中央处理单元（550）、辅助供电模块（540）以及LED模块。LED灯的配置可以实现LED模块关闭后或外部电源断开时开启余辉照明，或是小夜灯照明的功能。

Description

一种LED灯
相关申请
本申请主张中国专利申请，申请号为CN202111036192.8(申请日为2021-09-06)以及CN202111041416.4(申请日为2021-09-07)的优先权。上述两申请以引用方式全文并入本文中。
技术领域
本申请涉及LED照明领域，尤其涉及一LED灯。
背景技术
更清洁高效的LED灯逐渐取代荧光灯进入人们的生活。
在一般的生活场景中，当意外停电或熄灯后，照明灯具完全熄灭，在黑暗的环境中，人活动极为不便，以及容易产生不适心理。
若使用带有应急照明的LED灯，成本较高。
在一些照明场景中，需要持续的提供低照度的照明，以满足夜间活动的需要，同时又不会影响夜间的睡眠。一般的小夜灯需要单独的设置，占空空间，或者将小夜灯集成到灯具中，通常的将灯具的正常照明的LED模块和小夜灯的LED模块分开设置，这样将造成小夜灯发光不均匀等问题，影响使用效果。
另一方面，一般LED灯的驱动电路的调光深度无法满足小夜灯需要的低照度要求(0.1％)。
发明内容
本申请的目的在于提供一种具有辅助照明功能的LED灯，例如是馀晖照明或夜灯照明，用以解决上述问题。
本申请提出一种LED灯，其特征在于，包含：整流电路，电性连接至外部电源，用以接收外部电力信号并进行整流以生成整流后信号；滤波电路，电性连接至所述整流电路，用以接收整流后信号，并进行滤波，以生成滤波后信号；驱动电路，电性连接至所述滤波电路， 用以接收所述滤波后信号，并进行电源转换，以生成驱动信号；第一LED模块，电性连接至所述驱动电路，用以接收所述驱动信号而点亮；辅助供电模块，电性连接至所述滤波电路，用以接收所述滤波后信号，并生成辅助电源信号；市电检测模块，电性连接所述外部电源，用以检测所述外部电源的状态，并输出市电检测信号；中央处理单元：电性连接至所述辅助供电模块，使用所述辅助电源信号提供电力，电性连接至所述市电检测模块，用以接收所述市电检测信号，并输出第一控制信号和第二控制信号，所述第一控制信号用于向所述驱动电路传输，用以调节所述驱动信号；以及第二LED模块，电性连接至所述中央处理单元，用以根据所述第二控制信号点亮或熄灭；其中当所述外部电力信号的最大电压低于一设定阈值时，所述第二LED模块被点亮。
本申请一实施例中，所述第二LED模块在所述第一LED模块点亮时熄灭。
本申请一实施例中，其特征在于所述第二LED模块在所述外部电源停止供应时点亮。
本申请一实施例中，所述中央处理单元包含：控制电路，用以进行逻辑控制；以及储能电路，电性连接至所述控制电路和所述第二LED模块，用以在外部电源停止供应时提供电力给所述控制电路和所述第二LED模块。
本申请一实施例中，所述中央处理单元包含：控制电路，用以进行逻辑控制；第一储能单元，电性连接至所述控制电路，用以在外部电源停止电力供应时为所述控制电路提供电力；以及第二储能单元，电性连接至所述第二LED模块，用以在外部电源停止供应时为所述第二LED模块提供电力。
本申请一实施例中，所述中央处理单元包含控制接口，所述控制接口用以接收调光信号。
本申请一实施例中，第二LED模块的亮度小于第一LED模块的亮度，第二LED模块在点亮一段时间后熄灭。
本申请一实施例中，所述第一储能电路包含第一二极管、第一电阻、第一电容以及第二二极管。第一二极管，其阳极电性连接所述辅助供电模块。第一电阻，其第一接脚电性连接所述第一二极管的阴极。第一电容，其第一接脚电性连接所述第一電阻的第二接脚，且其第二接脚电性连接公共接地端。第二二极管，其阳极电性连接所述第一电阻的第二接脚和所述第一电容的第一接脚，且其阴极电性连接所述控制电路。
本申请一实施例中，所述第二储能电路包含第三二极管、第二电阻、第二电容以及第四 二极管。第三二极管，其阳极电性连接所述辅助供电模块。第二电阻，其第一接脚电性连接所述第三二极管的阴极。第二电容，其第一接脚电性连接所述第二電阻的第二接脚，且其第二接脚电性连接公共接地端。第四二极管，其阳极电性连接所述第二电阻的第二接脚和所述第二电容的第一接脚，且其阴极电性连接所述第二LED模块。
本申请一实施例中，所述中央处理单元更包含稳压二极管以及线性稳压电路。稳压二极管，其阳极电性连接所述辅助供电模块，且其阴极电性连接所述第二二极管的阴极。线性稳压电路，电性连接于所述稳压二极管的阴极和所述控制电路之间，用以形成所述控制电路的供电路径其中之一。
本申请一实施例中，所述中央处理单元更包含延时导通电路。延时导通电路，电性连接于所述辅助供电模块和所述第一二极管的阳极之间，用以在所述LED灯启动初期，断开所述第一二极管所在的电流路径，以使所述辅助供电模块所提供的电力都通过稳压二极管提供到后端。
本申请提出一种LED灯，其特征在于，包含：整流电路，电性连接至外部电源，用以接收外部电力信号并进行整流以生成整流后信号；滤波电路，电性连接至所述整流电路，用以接收整流后信号，并进行滤波，以生成滤波后信号；第一驱动电路，电性连接至所述滤波电路，用以接收所述滤波后信号，并进行电源转换，以生成第一驱动信号；LED模块，电性连接至所述第一驱动电路，用以接收所述第一驱动信号而点亮；第二驱动电路，电性连接至所述LED模块，用以生成第二驱动信号，点亮所述LED模块；辅助供电模块，电性连接至所述滤波电路，用以接收所述滤波后信号，并生成辅助电源信号；以及：中央处理单元，电性连接至所述辅助供电模块，使用所述辅助电源信号VCC提供电力，电性连接至所述第一驱动电路，用以通过控制第一驱动电路输出的第一驱动信号进行调光，电性连接至所述第二驱动电路，用以通过控制第二驱动电路输出的第二驱动信号进行调光；其中所述第一驱动电路和第二驱动电路不同时工作。
本申请一实施例中，所述第一驱动电路为BCUK型电源转化电路。
本申请一实施例中，所述第一驱动电路通过改变其输出的第一驱动信号的电流大小调整所述LED模块的亮度。
本申请一实施例中，所述第二驱动电路通过改变所述LED模块点亮和熄灭的时间比例调 整所述LED模块的亮度。
本申请一实施例中，所述LED模块点亮和熄灭的频率大于等于80Hz。
本申请一实施例中，所述中央处理单元更包含控制接口，用以接收外部控制信号，所述外部控制信号用以调节LED模块的亮度。
本申请一实施例中，所述控制接口为红外接收单元，用以接收红外控制信号，所述红外控制信号包含调光信号或其他操作指令。
本申请一实施例中，所述第一驱动电路的调光深度为1％，并且所述第二驱动电路的调光深度为0.1％。
本申请一实施例中，所述第一驱动电路包含二极管、电感、第一晶体管以及驱动控制电路。二极管，其阴极电性连接所述滤波电路和所述LED模块的阳极。电感，其第一接脚电性连接电性连接所述二极管的阳极，且其第二接脚电性连接所述LED模块的阴极。第一晶体管，其第一接脚电性连接所述二极管的阳极和所述电感的第一接脚，且其第二接脚电性连接公共接地端。驱动控制电路，电性连接所述第一晶体管的控制接脚以及所述中央处理单元，用以控制所述第一晶體管的导通状态。
本申请一实施例中，所述第二驱动电路包含电阻以及第二晶体管。电阻，其第一接脚电性连接所述LED模块的阴极和所述电感的第二接脚。第二晶体管，其第一接脚电性连接所述电阻的第二接脚，其第二接脚电性所述公共接地端，且其控制接脚电性连接所述中央处理单元。
本申请一实施例中，流经所述LED模块的电流经所述驱动控制电路的控制，以满足以下关系式：I＝D1*(V3-V4)/R6，其中V3为所述滤波后信号的电压，V4为所述LED模块两端的电压，D1为所述PWM信号的占空比。
本申请一实施例中，所述LED模块包含具有第一色温的第一LED单元以及具有第二色温的第二LED单元，其中所述LED灯更包含色温调节单元。色温调节单元，用以分别控制通过所述第一LED单元和所述第二LED单元的电流大小。
本申请一实施例中，所述色温调节单元包含第一晶体管以及第二晶体管。第一晶体管，串接于所述第一LED单元，并且受控于所述中央处理单元所提供的第一PWM信号。第二晶 体管，串接于所述第二LED单元，并且受控于所述中央处理单元所提供的第二PWM信号。
本申请一实施例中，所述第一PWM信号和所述第二PWM信号为互补信号，并且所述第一PWM信号和所述第二PWM信号的占空比总和为100％。
通过本申请所述的技术方案，LED灯可在主照明关闭后开启余辉照明，提供低照度的照明环境。另一方面，第一驱动电路点亮LED模块用以正常照明，第二驱动电路点亮LED模块用以小夜灯照明。小夜灯的调光深度可达到0.1％，满足夜间照明的低照度要求，同时又不影响人的睡眠。
附图说明
图1为本申请一实施例为本揭露一实施例的LED灯的电路方框示意图；
图2为本申请一实施例的中央处理单元550的电路方块示意图；
图3为本申请又一实施例的中央处理单元的电路方框示意图；
图4为本申请一实施例的中央处理单元的电路结构示意图；
图5为本申请又一实施例的中央处理单元的电路结构示意图；
图6为本申请又一实施例的中央处理单元的电路结构示意图；
图7为本申请又一实施例的中央处理单元的电路结构示意图；
图8为本申请又一实施例的中央处理单元的电路结构示意图；
图9为本申请一实施例的延时导通电路的电路结构示意图；
图10为为本申请又一实施例的LED灯的电路方块示意图；
图11为本申请一实施例的第一驱动电路和第二驱动电路的电路结构示意图；
[根据细则91更正 01.12.2022]　
图12为本申请一实施例的LED模块50的电路结构示意图；
[根据细则91更正 01.12.2022]　

图13为本申请一实施例的PWM1和PWM2的信号波形示意图；以及
图14为本申请一实施例的圆形吸顶灯的发光区域示意图。
具体实施方式
本申请提出一种为使本技术方案达到上述目的、特征和优点能够更为明显易懂，下面结合附图对提出的技术方案的具体实施例做详细的说明。下列本发明技术方案各实施例的叙述仅是为了说明而为例示,并不表示为本发明的全部实施例或将本发明限制于特定实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动的前提下所获得的所有其他实施例，都应当属于本揭露保护的范围。
需要说明的是，当元件被称为“设置于”另一个元件，它可以直接在另一个元件上或者也可以存在居中的元件。当一个元件被认为是“连接”另一个元件，它可以是直接连接到另一个元件或者可能同时存在居中元件。本文所使用的术语“垂直的”、“水平的”、“左”、“右”以及类似的表述只是为了说明的目的，并不表示是唯一的实施方式。
除非另有定义，本文所使用的所有的技术和科学术语与属于本实用新型的技术领域的技术人员通常理解的含义相同。本文中在本实用新型的说明书中所使用的术语只是为了描述具体的实施方式的目的，不是旨在于限制本实用新型。本文所使用的术语“和/或”包括一个或多个相关的所列项目的任意的和所有的组合。
电路示意图中的单个电阻在实际电路中可采用多个电阻串联或者并联的方式等效替代，本发明不限于此。电容亦可以采用多个电容串联或者并联的方式等效替代。
参考图1为本申请一实施例的LED灯的电路方框示意图。LED灯5包含整流电路510、滤波电路520、驱动电路530、第一LED模块50、第二LED模块51、辅助电源模块540、市电检测模块560、中央处理单元550。
整流电路510电性连接至外部电源EP，用以接收外部电力信号，并进行整流，将接收到的交流信号转换为直流信号，以生成整流后信号。滤波电路520电性连接至整流电路510用以接收整流后信号并进行滤波，以生成滤波后信号。
驱动电路530电性连接至滤波电路520，用以接收所述滤波会信号并进行电源转换，生成一驱动信号，所述驱动信号为直流信号。第一LED模块50电性连接至驱动电路530，用以接收所述驱动信号而点亮。第一LED模块至少包含一个发光二极管。
辅助电源模块540电性连接至滤波电路520，用以接收滤波后信号并进行电源转换，生成一辅助电源信号VCC，所述辅助电源信号VCC为恒压直流信号。所述辅助电源信号VCC用以为中央处理单元550提供电力。
市电检测模块560电性连接至外部电源，用以检测外部电力信号，并生成一市电检测信号，当外部电力信号的电压峰值小于一设定阈值时，市电检测模块560判断外部电源无电力供应；当外部电力信号的电压峰值大于等于所述设定阈值时，市电检测模块560判断外部电源有电力供应。所述市电检测信号用以指示外部电源的状态，当外部电源有电力供应时，所述市电检测信号为高电平；当外部电源无电力供应时，所述市电检测信号为低电平。
中央处理单元550电性连接至市电检测模块560、驱动电路530和第二LED模块51，用以接收所述市电检测信号，并输出第一控制信号和第二控制信号。所述第一控制信号用以向驱动电路530传输，用以通过控制驱动电路530调节所述驱动信号的电流。第一LED模块50的亮度与其电流相关，可以通过调整流经第一LED灯模块50的电流对第一LED模块50进行调光。所述第二控制信号用以向所述第二LED模块51传输，用以控制第二LED模块在不同的电路状态下的工作状态。可例如是，当外部电源无电力供应时，所述市电检测信号为低电平时，中经处理单元530经过逻辑运算输出第二控制信号令所述第二LED模块51点亮。
在一些实施例中，中央处理单元550包含控制接口，所述控制接口用以接收调光信号或其他控制信号。所述调光信号可以通过有线或无线的方式传输给中央处理单元550，本申请不以此为限。所述调光信号可例如是0-10V调光信号、红外遥控调光信号、PWM调光信号等。
第二LED模块51电性连接至中央处理单元550，用以接收所述第二控制信号而点亮/熄灭。第一LED模块50为主照明器件，主要用于正常情况下的照明，第二LED模块为辅助照明器件，用以在特殊情况下提供照明。
下面对第二LED模块51的使用场景进行简要说明。在一般的生活场景中，当第一LED模块50熄灭后，整个环境突然由明亮变为漆黑，人无法在漆黑的环境中继续活动，且漆黑的环境容易对人的心理容易造成负面影响。本实施例中，当第一LED模块50熄灭后，令第二LED模块点亮，为人提供足够活动的照明亮度。同时令第二LED模块51的亮度小于第一LED模块50的亮度，以使使用者明显的察觉主照明器件已经关闭，辅助照明器件开启；另外辅助照明可以使环境的亮度降低，让人对亮度变化有一个逐渐适应的过程，减轻使用者的心理压力。在一些实施例中，令第二LED模块的颜色区别于第一LED模块，可以达到同样的技术效果，本发明不以此为限。辅助照明还可以称为余辉照明。在此种使用场景中，可通过控制接口开启或关闭余辉照明功能。当余辉功能开启时，第一LED模块50熄灭后，第二LED模 块51在第二控制信号的控制下点亮；当余辉功能关闭时，第一LED模块50熄灭后，第二LED模块51在第二控制信号的控制下不点亮。在本种使用场景中，第二LED模块在点亮一段时间后自动熄灭。
在另外一个使用场景中，当市电发生故障，意外断电时，若室内没有安装应急照明设备，黑暗的环境将影响人的正常活动。本实施例中，当市电断电时，市电检测模块560判断市电断电，中央处理单元550接收市电检测信号，并输出第二控制信号给第二LED模块51，令第二LED模块51点亮，以提供市电断电后的辅助照明。在本中使用场景中，为了确保在市电断电时开启第二LED模块，所以设置为无法关闭此种场景下的余辉照明功能，即当市电断电时，第二LED模块51点亮。
参考图2为本申请一实施例的中央处理单元550的电路方块示意图。中央处理单元550包含控制电路551和第一储能电路552。第一储能电路552电性连接至辅助供电模块540、控制电路551和第二LED模块51。第一储能电路552接收辅助电源模块540输出的辅助电源信号VCC，并储存部分电能，当外部电源停止向LED灯5供电时，即辅助供电模块540停止输出辅助电源信号VCC,此时，第一储能电路552释放自己存储的电能给控制电路551和第二LED模块51。控制电路551电性连接至第二LED模块51，用以控制第二LED模块51的点亮/熄灭。
本实施例中，第一储能电路552在外部电源停止电力供应时同时为控制电路551和第二LED模块51提供电力。
参考图3为本申请又一实施例的中央处理单元的电路方框示意图。中央处理单元550包含控制电路551、第一储能电路552和第二储能电路553。第一储能电路552电性连接至辅助供电模块540用以接收辅助供电信号VCC，并存储部分电能。第二储能电路553电性连接至辅助供电模块540，用以接收辅助供电信号VCC，并存储部分电能。第一储能电路552电性连接至控制电路551，用以在外部电源停止电力供应时为控制电路51提供电力。第二储能电路553电性连接至第二LED模块51，用以在外部电源停止电力供应时为第二LED模块51提供电力。本实施例中中央处理单元550与图2所述的实施例类似，与之不同的是，图2所述的实施例中，控制电路551和第二LED模块51使用同一个储能电路，本实施例中，控制电路551和第二LED模块使用不同的储能电路。通过此种配置方式，第一储能电路552为控制电路551供电，第二储能电路553为第二LED模块51供电，可以减少控制电路551和第 二LED模块51的相互之间的影响，使电路更加稳定。
参考图4为本申请一实施例的中央处理单元的电路结构示意图。本实施例中的所述中央处理单元的电路结构为图2所述实施例的下位展开，中央处理单元550包含控制电路551和第一储能电路552。第一储能电路552包含二极管D1、D2，电阻R1和电容C1。二极管D1的阳极电性连接至辅助供电模块540(VCC)，其阴极电性连接至电阻R1的第一接脚。电阻R1的第二接脚电性连接至二极管D2的阳极和电容C1的第一接脚。电容C1的第二接脚电性连接至公共接地端GND。二极管D2的阴极电性连接至控制电路551。第二LED模块51包含发光二极管D3、电阻R2和晶体管Q1。发光二极管D3的阳极电性连接至二极管D2的阴极，其阴极电性连接至电阻R2的第一接脚，电阻R2的第二接脚电性连接至晶体管Q1的第一接脚，晶体管Q1的第二接脚电性连接至公共接地端GND，晶体管Q1的第三接脚电性连接至控制电路551。
下面阐述中央处理单元的动作原理。当外部电源有电力供应时，辅助供电模块540提供辅助电源信号VCC，所述辅助电源信号VCC通过电阻R1对电容C1进行充电，电容C1两端的电压逐渐升高，其存储的能量也逐渐增加，当外部电源停止电力供应时，电容C1通过释放其存储的电能为控制电路551和第二LED模块51提供电力。本实施例中，当外部电源停止电力供应时，控制电路551通晶体管Q1的第三接脚输出第二控制信号控制晶体管Q1导通，发光二极管D3点亮。
在其他实施例中，发光二极管D3可以由LED发光单元代替，所述LED发光单元为多个发光二极管串联和/或并联而成，本申请不以此为限。
参考图5为本申请又一实施例的中央处理单元的电路结构示意图。本实施例中所述中央处理单元的电路结构为图3所述实施例的下位展开。中央处理单元550包含控制电路551、第一储能电路552和第二储能电路553。第一储能电路552包含二极管D1、D2，电阻R1以及电容C1。第二储能电路554包含二极管D4、D5，电阻R3以及电容C2。第二LED模块51包含发光二极管D3、电阻R2和晶体管Q1。二极管D1的阳极电性连接至辅助供电模块540(VCC)，其阴极电性连接至电阻R1的第一接脚。电阻R1的第二接脚电性连接至二极管D2的阳极和电容C1的第一接脚。电容C1的第二接脚电性连接至公共接地端GND。二极管D2的阴极电性连接至控制电路551。二极管D4的阳极电性连接至辅助供电模块540，其阴极电性连接至电阻3的第一接脚。电阻R3的第二接脚电性连接至二极管D5的阳极和电容 C2的第一接脚。电容C2的第二接脚电性连接至公共接地端GND。二极管D5的阴极电性连接至发光二极管D3的阳极。发光二极管D3的阴极电性连接至电阻R2的第一接脚，电阻R2的第二接脚电性连接至晶体管Q1的第一接脚，晶体管Q1的第二接脚电性连接至公共接地端GND，晶体管Q1的第三接脚电性连接至控制电路551。
本实施例与图4所述的实施例类似，与之不同的是本实施例中，中央处理单元550更包含第二储能电路553。第一储能电路552电性连接至控制电路551，用以在外部电源停止电力供应时为控制单元551提供电力。第二储能电路553电性连接至第二LED模块51，用以在外部电源停止电力供应时为第二LED模块51提供电力。
与图4所述的实施例不同的是，图4所述的实施例中，控制电路551和第二LED模块51同时电性连接至第一储能电路552，在外部电源停止电力供应时，由第一储能电路552同时为控制电路551个第二LED模块51提供电力；本实施例中，当外部电源停止电力供应时，由第一储能电力552为控制电路551提供电力，由第二储能电路553为第二LED模块51提供电力。
图4所述的实施例中，LED灯上电时，辅助电源信号VCC首先对电容C1进行充电，当C1的电压上升到控制电路551的额定电压时，控制电路启动，LED灯正常工作，若只使用第一储能电路，为了维持第二LED模块在系统掉电后的较长的工作时间，势必会造成电容C1的电容选取较大的容值。在本实施例中，使用第一储能电路552和第二储能电路553分别为控制电路551和第二LED模块供电，电容C1可选用较小容值，电容C1的充电时间更短，上电后，控制电路551可在较短的时间内启动，LED灯的启动时间也将缩短。
参考图6为本申请又一实施例的中央处理单元的电路结构示意图。本实施例中，中央处理单元550的电路结构与图4所述的实施例类似，与之不同的是，本实施例中，中央处理单元550更包含线性稳压电路554和二极管D6。二极管D1的阳极电性连接至辅助供电模块540，其阴极电性连接至电阻R1的第一接脚。电阻R1的第二接脚电性连接至二极管D2的阳极和电容C2的第一接脚。电容C1的第二接脚电性连接至公共接地端GND。二极管D2的阴极电性连接至发光二极管D3的阴极阳极。二极管D6的阳极电性连接至二极管D1的阳极，其阴极电性连接至二极管D2的阴极。线性稳压电路554电性连接至二极管D6的阴极和控制电路551。第二LED模块51的电路结构与前述实施例类似，此处不再赘述。
当外部电源提供电力时，辅助电源信号VCC通过电阻R1对C1进行充电，同时通过二极管D6为线性稳压电路554提供电力。中央处理单元包含双路电源架构，第一路电源由二极管D6，线性稳压电路554形成的路径形成，第二路电源由第一储能电路552、线性稳压电路554形成的路径形成。在外部电源提供电力时，第一路电源和第二路电源都可以为控制电路551提供电力，当外部电源停止电力供应时，可由第一储能电路552形成的第一路电源为控制电路提供电力。通过本实施例的技术方案，LED灯上电后，第二路电源可以快速的为控制电路提供电力，使系统启动更快。
参考图7为本申请又一实施例的中央处理单元的电路结构示意图。本实施例中央处理单元550的电路结构与图6所述的实施例类似，与之不同的是，本实施例中，中央处理单元550更包含延时导通电路555。延时导通电路555电性连接至二极管D1和辅助供电模块540之间。当LED灯上电时，延时导通电路555处于断开状态，辅助电源信号VCC通过二极管D6和线性稳压电路554为控制电路提供电力，经过设定时间t1后，延时导通电路555导通，辅助电源信号VCC通过电容R1为电容C1充电。通过本申请的技术方案，LED灯上电后，控制电路551首先取得电力并正常工作，经过时间t1后，辅助电源信号VCC才对第一储能电路552进行充电。LED灯可以获得更快的启动速度。
本实施例中，t1可通过修改延时导通电路555的器件参数设定。
参考图8为本申请又一实施例的中央处理单元的电路结构示意图。本实施例中央处理单元550的电路结构与图7所述的实施例类似，与之不同的是，本实施例中，中央处理单元550更包含第二储能电路553和延时导通电路556。延时导通电路556电性连接至第二储能电路和辅助供电模块540之间。第二储能电路530的电路结构与图5所述的实施例相同，此处不在赘述。同时参考图7所述的实施例，本实施例中，延时导通电路555和延时导通电路556可分别控制辅助电源信号VCC对第一储能电路552和第二储能电路553的充电时间。当系统上电时，延时导通电路555和556处于断开状态，辅助电源信号VCC首先对控制电路551进行供电，使LED灯启动，进入工作状态。当经过时间t1后，延时导通电路555导通，辅助电源信号VCC对第一储能电路552进行充电，当经过时间t2后，延时导通电路556导通，辅助电源信号VCC对第二储能电路554进行充电。通过设定延时导通电路555和556的电路参数，令t1≠t2，当t1<t2时，延时导通电路555首先导通，当t1>t2时，延时导通电路556首先导通。
通过本实施例的技术方案，可令控制电路551在系统上电时首先进入正常工作状态，减少系统的启动时间。令第一储能电路552和第二储能电路553延迟进入充电状态，以防止辅助电源信号VCC对第一储能电路552和第二储能电路553进行充电时对控制电路551造成影响，增加系统的启动时间。
参考图9为本申请一实施例的延时导通电路的电路结构示意图，本实施例中，延时导通电路555包含电容C3、电阻R4、R5以及晶体管Q2。电容C3的第一接脚电性连接至辅助供电模块540、电阻R4的第一接脚和晶体管Q2的第一接脚，电容C3的第二接脚电性连接至电阻R4的第二接脚、电阻R5的第一接脚和晶体管Q2的第三接脚。电阻R5的第二接脚电性连接至公共接地端。晶体管Q2的第二接脚为延时导通电路的输出端。
下面阐述延时导通电路555的工作原理。设电阻R4第二接脚处的电压为V1，当系统上电后，由于电容C3两端的电压不能突变，V1由VCC逐渐降低至V2
V2满足关系式：
V2＝VCC*R5/(R4+R5)
本实施例中，晶体管Q2为PMOS，V2<V GS,V GS为晶体管Q2的导通电压。
当满足条件V1<V GS时，晶体管Q2导通，电力信号VCC可通过晶体管Q2传输至延时导通电路输出端Vout。可通过控制电阻R4、R5和电容C3的参数调整晶体管Q2从系统上电到导通的时间间隔t2。
t2满足下列关系式：
t2＝(R4//R5)*C3*ln[(V2-Vcc)/(V2-(Vcc-|Vgs|)]
式中，(R4//R5)代表电阻R4和R5并联之后的阻值,V GS≈-3V。
通过上述实施例的技术方案，LED灯具有第一LED模块和第二LED模块，第一LED模块用以主照明，第二LED模块用以在第一LED模块关闭后或外部电源断开时提供短暂的余辉照明，当余辉照明启动时，仍可以通过控制接口对余辉照明进行关闭或开启。
参考图10为本申请又一实施例的LED灯的电路方块示意图。本实施例中，LED灯5包含整流电路510、滤波电路520、第一驱动电路530、LED模块50、辅助供电模块540、中央处理单元550以及第二驱动电路570。整流电流510电性连接至外部电源EP用以接收外部电 力信号并进行整流以生成整流后信号。滤波电路520电性连接至整流电路510，用以接收整流后信号并进行滤波，以生成滤波后信号。第一驱动驱动电路530电性连接至滤波电路520，用以接收滤波后信号并进行电源转换，以生成第一驱动信号。LED模块50电性连接至驱动电路530，用以接收第一驱动信号而点亮。辅助供电模块540电性连接至滤波电路520，用以接收滤波后信号并进行电源转换，以生成辅助电源信号VCC。中央处理单元550电性连接至辅助供电模块，用以使用辅助电源信号VCC进行供电。中央处理单元550电性连接至第一驱动电路530用以通过控制第一驱动电路530输出的第一驱动信号进行调光。中央处理单元550电性连接至第二驱动电路570，用以调节第二驱动电路570输出的第二驱动信号。第二驱动电路570电性连接至LED模块50，用以输出第二驱动信号点亮LED模块50。本实施例中，第一驱动电路530和第二驱动电路570同时连接至LED模块50，并且都可以用来点亮LED模块50。第一驱动电路530作为主驱动电路，用以正常情况下的LED灯照明，第二驱动电路570为副驱动电路，用以在夜间进行低照度照明。
本实施例中，第一驱动电路530为BUCK型电源转换电路，其调光深度约为1％，若使用第一驱动电路530对LED模块50进行调光来作为小夜灯使用，其最低亮度仍无法满足小夜灯的低照度要求，因此本实施例中，使用第二驱动电路570来驱动LED模块50作为小夜灯使用。第二驱动电路570的调光深度可以达到0.1％。
本实施例中，所述辅助电源信号VCC为低压直流信号。
在一些实施例中，辅助电源信号VCC的电压范围为3.3-30V。
本实施例中，第一驱动电路530驱动LED模块50作为主照明使用，第二驱动电路570驱动LED模块50作为小夜灯使用。小夜灯使用LED模块50作为发光单元，可以使小夜灯发光更均匀。参考图14为圆形吸顶灯的发光区域示意图。现有技术中，一般将LED单元50均匀的设置于环形区域内，在正常照明模式下，LED模块50被点亮。另外设置一个或几个LED灯珠在方形区域62内，当小夜点亮时，只有方形区域被点亮，造成整个发光区域不均匀。若采用本实施例的技术方案，当小夜灯点亮时，LED模块50被点亮，其发光区域与正常照明模式下相同，发光区域更均匀。
参考图11为本申请一实施例的第一驱动电路和第二驱动电路的电路结构示意图。本实施例中，第一驱动电路530包含二极管D7、电感L1、晶体管Q4和驱动控制电路531。LED模 块50包含发光二极管D8、D9。第二驱动电路570包含晶体管Q3和电阻R6。二极管D7的阴极电性连接至滤波电路520和发光二极管D8的阳极，其阳极电性连接至晶体管Q4的第二接脚和电感L1的第一接脚。电感L1的第二接脚电性连接至发光二极管D9的阴极和电阻R6的第一接脚。晶体管Q4的第二接脚电性连接至驱动控制电路531，其第三接脚电性连接至公共接地端GND。晶体管Q3的第二接脚电性连接至公共接地端GND，其第三接脚电性连接至中央处理单元550。驱动控制电路531电性连接至中央处理单元550。
下面阐述第一驱动电路的工作原理。本实施例中，第一驱动电路为BCUK型电源转换电路，对接收到的滤波后信号进行降压转换，以生成第一驱动信号用以点亮LED模块50，驱动控制电路531通过控制晶体管Q4的导通占空比调整第一驱动信号的电流，从而调整LED模块50的亮度。
第一驱动电路530虽然可以通过调整第一驱动信号的电流大小调整LED模块50的亮度，但是，第一驱动电路530的调光深度只能达到1％左右，无法满足小夜灯更小的调光深度需求。第二驱动电路530与第一驱动电路530的负载相同，都为LED模块50，当使用第二驱动电路570驱动LED模块50时，第一驱动电路530不工作，即晶体管Q4处于断开状态。当晶体管Q3导通时，流经LED模块50的电流I满足下列关系式：
I＝(V3-V4)/R6
式中，V3为滤波后信号的电压，V4为LED模块50两端的电压，当晶体管Q3导通时，其第一引脚和第二引脚之间的电压很小，可以忽略不计。
中央处理单元550通过PWM信号控制晶体管Q3的导通和截止，当PWM信号为高电平时，晶体管Q3导通，LED模块50被点亮；当PWM信号为低电平时，晶体管Q3截止，LED模块熄灭，可以通过调整所述PWM信号的占空比来调节LED模块的点亮和熄灭的比例，当点亮的比例变高时，LED模块50的亮度增加；当点亮的比例变低时，LED模块50的亮度降低。当所述PWM信号的频率大于等于80Hz时，人眼便察觉不出这种闪烁，认为LED模块一直处于点亮状态。
当使用PWM信号调整LED模块50的亮度时，流经LED模块50的电流I满足下列关系式：
I＝D1*(V3-V4)/R6
式中，V3为滤波后信号的电压，V4为LED模块50两端的电压，D1为所述PWM信号的占空比，当晶体管Q3导通时，其第一引脚和第二引脚之间的电压很小，可以忽略不计。
采用本实施例的技术方案，可以使LED模块50的调光深度达到0.1％，可以使小夜灯的亮度降到足够小，以满足不同环境下的照明需求。可例如是，在睡眠环境中，将小夜灯的亮度调至0.1％，既可以满足夜间基本的照明需求，又不影响人的睡眠。
本实施例中，中央处理单元550包含控制接口，可以通过控制接口向中央处理单元发送调光信号或其他操作指令，可例如是，使能或禁能第一驱动电路530和/或第二驱动电路570、使用第一驱动电路530进行调光、使用第二驱动电路570进行调光等。
本实施例中，中央处理单元550的包含控制接口，所述控制接口为红外接收单元，用以接收红外控制信号，所述红外控制信号包含调光信号或其他操作指令。
在其他实施例中，LED模块50由多个发光二极管串联和/或并联而成，本发明不依此为限。
参考图12为本申请一实施例的LED模块50的电路结构示意图。本实施例中LED模块50包含第一LED单元501和第二LED单元502。第一LED单元501包含发光二极管D8和D9，第二LED单元包含D10和D11。LED灯5更包含色温调节单元580，色温调节单元580包含晶体管Q5和Q6。发光二极管D8的阳极电性连接至发光二极管D10的阳极并电性连接至第一驱动电路530。发光二极管D9的阳极电性连接至发光二极管D8的阴极，其阴极电性连接至晶体管Q5的第一接脚。发光二极管D11的阳极电性连接至发光二极管D10的阴极，其阴极电性连接至晶体光Q6的第一接脚。晶体管Q5的第二接脚电性连接至中央处理单元550，晶体管Q6的第二接脚电性连接至中央处理单元550。晶体光Q5的第三接脚电性连接至晶体管Q6的第三接脚并电性连接至第一驱动电路530。
下面阐述LED灯5进行色温节的原理。第一LED单元501和第二LED单元502的色温不同，通过控制第一LED单元501和第二LED单元502的点亮时间调节LED灯的色温。中央处理单元550通过PWM信号控制晶体管Q5和Q6的导通和截止。当晶体管Q5导通时，第一LED单元501被点亮，当晶体光Q6到导通时，第二LED单元502被点亮。本实施例中，晶体管Q5和Q6不同时导通。同时参考图13，PWM1为中央处理单元550控制晶体管Q5的PWM信号，PWM2为中央处理单元控制晶体管Q6的PWM信号。当PWM1信号为高电 平时，晶体管Q5导通，当PWM1信号为低电平时，晶体管Q5截止；同理，当PWM 2信号为高电平时，晶体管Q6导通，当PWM2信号为低电平时，晶体管Q6截止。PWM1和PWM2频率相同，在一个频率周期T1内，当PWM1为高电平时，PWM2为低电平。当PWM1的占空比变大时，流经第一LED单元501的平均电流变大，第一LED单元501的亮度增加，同时，PWM2的占空比减小，流经第二LED单元的502的平均电流减小，第二LED单元502亮度减小，因第一LED单元501和第二LED单元502的色温不同，当其亮度发生变化时，整体LED灯的色温发生变化。
在一些实施例中，令第一LED单元501的色温为4000k，第二LED单元502的色温为6000k，当PWM1的占空比为100％时，PWM2的占空比为0％，第一LED单元501点亮，第二LED单元502熄灭，整灯的色温为4000k。同理，当PWM1的占空比为0％，PWM2的占空比为100％，第一LED单元501熄灭，第二LED单元502点亮，整灯的色温为6000k。当PWM1的占空比为50％时，PWM2的占空比为50％，第一LED单元501和第二LED单元502都处于点亮状态，其整灯色温约为5000k。通过改变PWM1的占空比即可改变整灯的色温。
通过本申请中的技术方案，第一驱动电路530和第二驱动电路570采用不同的方式驱动LED模块50点亮，第一驱动电路530驱动LED模块50用以日常照明，第二驱动电路570驱动LED模块50用以小夜灯照明。第一驱动电路530和第二驱动电路570不同时工作。相较于第一驱动电路530，第二驱动电路570能够达到更低的调光深度(0.1％及以下)，使小夜灯的亮度更低，在满足夜间基本照明要求的同时，又不影响人的睡眠。
本实施例中，第二驱动电路570驱动LED模块50点亮时，同样可以进行色温调节。

Claims (10)

  1. 一种LED灯，其特征在于，包含：
    整流电路，电性连接至外部电源，用以接收外部电力信号并进行整流以生成整流后信号；
    滤波电路，电性连接至所述整流电路，用以接收整流后信号，并进行滤波，以生成滤波后信号；
    驱动电路，电性连接至所述滤波电路，用以接收所述滤波后信号，并进行电源转换，以生成驱动信号；
    第一LED模块，电性连接至所述驱动电路，用以接收所述驱动信号而点亮；
    辅助供电模块，电性连接至所述滤波电路，用以接收所述滤波后信号，并生成辅助电源信号；
    市电检测模块，电性连接所述外部电源，用以检测所述外部电源的状态，并输出市电检测信号；
    中央处理单元，电性连接至所述辅助供电模块，使用所述辅助电源信号提供电力，电性连接至所述市电检测模块，用以接收所述市电检测信号，并输出第一控制信号和第二控制信号，所述第一控制信号用于向所述驱动电路传输，用以调节所述驱动信号；以及
    第二LED模块，电性连接至所述中央处理单元，用以根据所述第二控制信号点亮或熄灭；
    其中当所述外部电力信号的最大电压低于一设定阈值时，所述第二LED模块被点亮，
    其中所述中央处理单元包含：
    控制电路，用以进行逻辑控制；
    第一储能电路，电性连接至所述控制电路，用以在外部电源停止电力供应时为所述控制电路提供电力；以及
    第二储能电路，电性连接至所述第二LED模块，用以在外部电源停止供应时为所述第二LED模块提供电力，
    其中所述第一储能电路包含：
    第一二极管，其阳极电性连接所述辅助供电模块；
    第一电阻，其第一接脚电性连接所述第一二极管的阴极；
    第一电容，其第一接脚电性连接所述第一電阻的第二接脚，且其第二接脚电性连接公共接地端；以及
    第二二极管，其阳极电性连接所述第一电阻的第二接脚和所述第一电容的第一接脚，且 其阴极电性连接所述控制电路，
    其中所述第二储能电路包含：
    第三二极管，其阳极电性连接所述辅助供电模块；
    第二电阻，其第一接脚电性连接所述第三二极管的阴极；
    第二电容，其第一接脚电性连接所述第二電阻的第二接脚，且其第二接脚电性连接公共接地端；以及
    第四二极管，其阳极电性连接所述第二电阻的第二接脚和所述第二电容的第一接脚，且其阴极电性连接所述第二LED模块。
  2. 如权利要求1所述的LED灯，其特征在于，所述第二LED模块在所述第一LED模块点亮时熄灭。
  3. 如权利要求1所述的LED灯，其特征在于所述第二LED模块在所述外部电源停止供应时点亮。
  4. 如权利要求1所述的LED灯，其特征在于，所述中央处理单元包含控制接口，所述控制接口用以接收调光信号。
  5. 如权利要求1所述的LED灯，其特征在于，第二LED模块的亮度小于第一LED模块的亮度，第二LED模块在点亮一段时间后熄灭。
  6. 如权利要求1所述的LED灯，其特征在于，所述中央处理单元更包含：
    稳压二极管，其阳极电性连接所述辅助供电模块，且其阴极电性连接所述第二二极管的阴极；以及
    线性稳压电路，电性连接于所述稳压二极管的阴极和所述控制电路之间，用以形成所述控制电路的供电路径其中之一。
  7. 如权利要求6所述的LED灯，其特征在于，所述中央处理单元更包含：
    延时导通电路，电性连接于所述辅助供电模块和所述第一二极管的阳极之间，用以在所述LED灯启动初期，断开所述第一二极管所在的电流路径，以使所述辅助供电模块所提供的电力都通过稳压二极管提供到后端。
  8. 如权利要求1所述的LED灯，其特征在于，所述驱动电路包含：
    第一驱动电路，电性连接至所述滤波电路，用以接收所述滤波后信号，并进行电源转换，以生成第一驱动信号；以及
    第二驱动电路，电性连接至所述LED模块，用以生成第二驱动信号，点亮所述第一LED模块，
    其中所述中央处理单元通过控制所述第一驱动电路输出的第一驱动信号和控制所述第二驱动电路输出的第二驱动信号进行调光，其中所述第一驱动电路和第二驱动电路不同时工作。
  9. 如权利要求8所述的LED灯，其特征在于，所述第二驱动电路通过改变所述LED模块点亮和熄灭的时间比例调整所述LED模块的亮度，其中所述LED模块点亮和熄灭的频率大于等于80Hz。
  10. 如权利要求8所述的LED灯，其特征在于，所述第一驱动电路的调光深度为1％，并且所述第二驱动电路的调光深度为0.1％。
PCT/CN2022/117264 2021-09-06 2022-09-06 一种led灯 WO2023030535A1 (zh)

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