CN114222400B - LED driving power supply, driving method and lamp - Google Patents
LED driving power supply, driving method and lamp Download PDFInfo
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- CN114222400B CN114222400B CN202111536565.8A CN202111536565A CN114222400B CN 114222400 B CN114222400 B CN 114222400B CN 202111536565 A CN202111536565 A CN 202111536565A CN 114222400 B CN114222400 B CN 114222400B
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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]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/375—Switched mode power supply [SMPS] using buck topology
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
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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]
- H05B45/30—Driver circuits
- H05B45/34—Voltage stabilisation; Maintaining constant voltage
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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]
- H05B45/30—Driver circuits
- H05B45/36—Circuits for reducing or suppressing harmonics, ripples or electromagnetic interferences [EMI]
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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]
- H05B45/30—Driver circuits
- H05B45/395—Linear regulators
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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
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
- H05B47/175—Controlling the light source by remote control
- H05B47/19—Controlling the light source by remote control via wireless transmission
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- 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
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- 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
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The application provides an LED drive power supply, a drive method and a lamp, wherein the LED drive power supply comprises: the system comprises a rectifying module, a transformer, a feedback module, a main control module, a singlechip and an adjusting module, wherein the adjusting module is connected with the singlechip and the feedback module, when the singlechip receives a starting-up instruction, the singlechip outputs a first signal to the adjusting module, the adjusting module is in a first state, and the main control module controls the load voltage output by the transformer to be in a first numerical value according to the feedback signal provided by the feedback module; when the singlechip receives a standby instruction, the singlechip outputs a second signal to the adjusting module, the adjusting module is adjusted to be in a second state, and the main control module controls the load voltage output by the transformer to be in a second numerical value according to a feedback signal provided by the feedback module; the first value is greater than the second value. The LED driving power supply reduces standby power consumption.
Description
Technical Field
The application relates to the technical field of circuit design, in particular to an LED driving power supply with lower standby power consumption, a driving method and a lamp.
Background
In the existing LED driving power supply, when in standby, the single-chip microcomputer in the power supply is usually used for switching off PWM and switching off a circuit which does not need to work to reduce standby loss, but because the output voltage is compatible with the function of power supply, the output voltage cannot be switched off, so that the standby power consumption of the existing LED driving power supply is still higher. The energy star in europe requires that the power of the system is less than 0.5W at standby. It is apparent that the existing LED driving power supply needs to be improved.
Disclosure of Invention
The invention aims to provide an LED driving power supply with low standby power consumption, a driving method and a lamp.
To achieve the above object, the present application provides an LED driving power supply, including:
the rectification module is connected with external alternating current, receives the input of the external alternating current, and converts the input of the external alternating current into high-voltage direct current suitable for the LED driving power supply to be output;
the transformer is connected with the rectifying module, receives the high-voltage direct current input and outputs load voltage to the LED load for working;
the feedback module is connected with the transformer, receives the load voltage and outputs a feedback signal;
the main control module is connected with the feedback module and the transformer simultaneously, receives the feedback signal output by the feedback module, generates a control signal, and outputs the control signal to the transformer so as to adjust the load voltage;
the singlechip is connected with the external control module and the LED load, receives a control instruction sent by the external control module, generates an adjusting signal and outputs the adjusting signal to the LED load for adjustment;
the regulating module is connected with the singlechip and the feedback module, when the singlechip receives a starting-up instruction, the singlechip outputs a first signal to the regulating module, the regulating module is in a first state, and the main control module controls the load voltage output by the transformer to be in a first numerical value according to the feedback signal provided by the feedback module; when the singlechip receives a standby instruction, the singlechip outputs a second signal to the adjusting module, the adjusting module is adjusted to be in a second state, and the main control module controls the load voltage output by the transformer to be in a second numerical value according to a feedback signal provided by the feedback module; the first value is greater than the second value.
Further, the LED driving power supply further comprises a level conversion module and a linear voltage reduction module; the level conversion module is connected with the singlechip and the LED load, receives the adjusting signal output by the singlechip, converts the adjusting signal into a load adjusting signal suitable for the LED load, and outputs the load adjusting signal to the LED load; the linear voltage reduction module receives the load voltage output by the transformer, reduces the load voltage to the working voltage required by the level conversion module and outputs the working voltage to the level conversion module; the value of the working voltage required by the level conversion module is equal to the second value of the load voltage.
Further, the feedback module comprises an optocoupler, and a first end of an input side of the optocoupler is connected with the load voltage through a tenth resistor; the second end of the input side of the optocoupler is connected with the negative end of the voltage stabilizing tube, and the positive end of the voltage stabilizing tube is connected with the ground; the regulating end of the voltage stabilizing tube is connected with the load voltage through a twelfth resistor, is connected with the negative end of the voltage stabilizing tube through a third capacitor and an eleventh resistor which are sequentially connected in series, and is connected with the ground through a thirteenth resistor and a fourteenth resistor which are sequentially connected in series; the first end of the output side of the optical coupler is connected with the main control module, the generated feedback signal is sent to the main control module, and the second end of the output side of the optical coupler is connected with the ground; the adjusting module comprises a third MOS tube, the drain and source ends of the third MOS tube are connected in parallel with the two ends of the thirteenth resistor or the fourteenth resistor, and the gate end of the third MOS tube is connected with the singlechip through the twenty-first resistor.
Further, the LED driving power supply further comprises a power supply module, wherein the power supply module is connected with the load voltage and outputs working voltages required by other modules in the LED driving power supply.
Further, the power module comprises a power chip; the first end of the power chip is a driving end and is connected with the gate end of a fifth MOS tube through a twentieth resistor, the drain end of the fifth MOS tube is connected with the load voltage, the source end of the fifth MOS tube is connected with the third end of the power chip, and the third end of the power chip is a sampling end; the second end of the power supply chip is a grounding end and is connected with the first end of a fifth inductor, the power supply chip is also connected with the gate end of the fifth MOS tube through an eighteenth resistor, is also connected with the source end of the fifth MOS tube through a nineteenth resistor, is also connected with the ground through a fifth diode, and the second end of the fifth inductor is the output end of the power supply module and is also connected with the ground through a second output capacitor; the fourth end of the power chip is a feedback end and is connected with the second end of the power chip through a seventeenth resistor and is also connected with the output end of the power module through a sixteenth resistor; the fifth end of the power chip is a power end and is connected with the load voltage through a fifteenth resistor, and the fifth end of the power chip is also connected with the second end of the power chip through a fourth capacitor and a second zener diode which are connected in parallel.
Further, the transformer comprises a primary coil and a secondary coil; the first end of the primary coil of the transformer is connected with the rectifying module, receives the high-voltage direct current, and is connected with the second end of the primary coil of the transformer through a first capacitor and a first diode which are sequentially connected in series, and two ends of the first capacitor are also connected with a second resistor in parallel; the first end of the secondary coil of the transformer outputs the load voltage through a third diode and a fourth diode which are connected in parallel, and the second end of the secondary coil of the transformer is connected with the ground.
Further, the main control module comprises a main control chip, and the transformer further comprises an auxiliary coil; the second end of the main control chip is a power end and is connected with the first end of the auxiliary coil of the transformer through a second diode and is also connected with the ground through a first output capacitor; the fifth end of the main control chip is a driving end and is connected with the gate end of a fourth MOS tube through a fourth resistor, the drain end of the fourth MOS tube is connected with the second end of the primary coil of the transformer, and the source end of the fourth MOS tube is connected with the ground through a first resistor; the sixth end of the main control chip is a sampling end and is connected with the source end of the fourth MOS tube through a third resistor; the eighth end of the main control chip is a feedback end and is connected with the feedback module; the fourth end of the main control chip is a high-voltage end and is connected with the high-voltage direct current.
Further, the rectification module comprises an EMI filtering unit and a bridge rectification unit; the input side of the EMI filtering unit is connected with the external alternating current, and the output side of the EMI filtering unit is connected with the input side of the bridge rectifying unit; the first end of the output side of the bridge rectifying unit outputs the direct-current high-voltage power, and is connected with the second end of the output side of the bridge rectifying unit through a second capacitor, and the second end of the output side of the bridge rectifying unit is connected with the ground.
Further, the LED load comprises a first LED string and a second LED string; one end of the first LED string is connected with the load voltage, the other end of the first LED string is connected with one end of a first current limiting IC, the other end of the first current limiting IC is connected with the drain end of a first MOS tube, the source end of the first MOS tube is connected with the ground through a fifth resistor, the gate end of the first MOS tube is connected with the singlechip through a seventh resistor, a first adjusting signal provided by the singlechip is received, and the gate end of the first MOS tube is also connected with the source end of the first MOS tube through an eighth resistor; one end of the second LED string is connected with the load voltage, the other end of the second LED string is connected with one end of a second current limiting IC, the other end of the second current limiting IC is connected with the drain end of a second MOS tube, the source end of the second MOS tube is connected with the ground through a fifth resistor, the gate end of the second MOS tube is connected with the singlechip through a sixth resistor, a second adjusting signal provided by the singlechip is received, and the gate end of the second MOS tube is also connected with the source end of the second MOS tube through a ninth resistor; the LED load further comprises a third output capacitor, one end of the third output capacitor is connected with the load voltage, and the other end of the third output capacitor is connected with the ground; the singlechip also comprises a load current sampling end which is connected with the source end of the first MOS tube and the source end of the second MOS tube.
Further, the LED driving power supply further comprises an external control interface, the single chip microcomputer is connected with the external control module through the external control interface, the single chip microcomputer is communicated with the external control interface through a WIFI mode, a Bluetooth mode, a Zigbe mode or a Dali mode, and the external control module comprises an APP, a remote control or a knob switch.
The application also provides an LED driving method, which uses the LED driving power supply, and comprises the following steps:
when the singlechip receives a starting-up instruction, the singlechip outputs a first signal to the regulating module, the regulating module is in a first state, and the main control module controls the load voltage output by the transformer to be in a first value according to a feedback signal provided by the feedback module; when the singlechip receives a standby instruction, the singlechip outputs a second signal to the adjusting module, the adjusting module is adjusted to be in a second state, and the main control module controls the load voltage output by the transformer to be in a second numerical value according to a feedback signal provided by the feedback module; the first value is greater than the second value.
The application also provides a lamp, which comprises an LED driving power supply and an LED load, wherein the LED driving power supply is the LED driving power supply.
The LED driving power supply, the driving method and the lamp have the following beneficial effects:
according to the LED driving power supply, the driving method and the lamp, the adjusting module is added on the feedback module, and the adjusting module is connected in parallel with two ends of one resistor in the feedback module; when the power-on is started, the regulating module is in a first state, such as disconnection, one resistor in the feedback module participates in work, and the main control module controls the load voltage output by the transformer to be in a first value according to a feedback signal provided by the feedback module; when the transformer is in standby, the regulating module is regulated to be in a second state, such as conduction, one resistor in the feedback module is short-circuited and does not participate in work, and the main control module controls the load voltage output by the transformer to be in a second value according to a feedback signal provided by the feedback module. Wherein the first value is greater than the second value, so standby power consumption is reduced. And at this time, the linear voltage reduction module for providing the working voltage for the level conversion module can also not work, so that the standby power consumption is further reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a part of a structure of an LED driving power supply according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of another part of the structure of an LED driving power supply according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, based on the embodiments herein, which are within the scope of the protection of the present application, will be within the skill of the art without inventive effort. Furthermore, it should be understood that the detailed description is presented herein for purposes of illustration and explanation only and is not intended to limit the present application. In this application, unless otherwise indicated, terms of orientation such as "upper", "lower", "left" and "right" are generally used to refer to the directions of the drawings in which the device is actually used or in an operating state.
The application provides an LED driving power supply, a driving method and a lamp, and the LED driving power supply, the driving method and the lamp are respectively described in detail below. It should be noted that the following description order of the embodiments is not intended to limit the preferred order of the embodiments of the present application. In the following embodiments, the descriptions of the embodiments are focused on, and for the part that is not described in detail in a certain embodiment, reference may be made to the related descriptions of other embodiments.
Referring to fig. 1-2, an LED driving power supply provided in the present application includes:
the rectification module is connected with external alternating current, receives the input of the external alternating current, and converts the input of the external alternating current into high-voltage direct current suitable for the LED driving power supply to be output;
the transformer is connected with the rectifying module, receives the high-voltage direct current input and outputs load voltage to the LED load for working;
the feedback module is connected with the transformer, receives the load voltage and outputs a feedback signal;
the main control module is connected with the feedback module and the transformer simultaneously, receives the feedback signal output by the feedback module, generates a control signal, and outputs the control signal to the transformer so as to adjust the load voltage;
the singlechip is connected with the external control module and the LED load, receives a control instruction sent by the external control module, generates an adjusting signal and outputs the adjusting signal to the LED load for adjustment;
the regulating module is connected with the singlechip and the feedback module, when the singlechip receives a starting-up instruction, the singlechip outputs a first signal to the regulating module, the regulating module is in a first state, and the main control module controls the load voltage output by the transformer to be in a first numerical value according to the feedback signal provided by the feedback module; when the singlechip receives a standby instruction, the singlechip outputs a second signal to the adjusting module, the adjusting module is adjusted to be in a second state, and the main control module controls the load voltage output by the transformer to be in a second numerical value according to a feedback signal provided by the feedback module; the first value is greater than the second value.
The rectifying module comprises an EMI filtering unit and a bridge rectifying unit; the input side of the EMI filtering unit is connected with the external alternating current, and the output side of the EMI filtering unit is connected with the input side of the bridge rectifying unit; the first end of the output side of the bridge rectifier unit outputs the direct-current high-voltage power, and is connected with the second end of the output side of the bridge rectifier unit through a second capacitor C2, and the second end of the output side of the bridge rectifier unit is connected with the ground PGND. The rectification module receives an external alternating current input (AC input), typically 220V mains. The magnitude of the high-voltage direct current to be output is not particularly limited, and is mainly determined according to the magnitude of the voltage required by the LED driving power supply: for example, the size of the LED load required to be driven by the LED driving power supply determines the size of the load voltage to be output by the LED driving power supply, the size of the load voltage output by the LED driving power supply is realized by a transformer therein, and the transformer is realized by converting the high-voltage direct current, which is generally greater than the load voltage; for another example, the magnitude of the operating voltage required by each chip of each module in the LED driving power supply may also affect how high the high voltage dc power is required. In summary, the dc power may be adapted to the overall function of the LED driving power supply, and in one embodiment, the dc power is 60V.
And the external alternating current passes through the rectification module to generate the high-voltage direct current, and then the high-voltage direct current is transmitted to the transformer to generate the load voltage required by the LED load. In this embodiment, the transformer T1 includes a primary coil and a secondary coil; the first end of the primary coil of the transformer T1 is connected with the rectifying module, receives the high-voltage direct current, and is connected with the second end of the primary coil of the transformer T1 through a first capacitor C1 and a first diode D1 which are sequentially connected in series, and two ends of the first capacitor C1 are also connected with a second resistor R2 in parallel; the first end of the secondary coil of the transformer T1 outputs the load voltage Vled through a third diode D3 and a fourth diode D4 connected in parallel, and the second end of the secondary coil of the transformer T1 is connected to the ground SGND. Here, the ground is the signal ground SGND, and the ground is the power-equalizing ground PGND, which is not specifically described herein, as will be readily understood by those skilled in the art.
And after the transformer generates load voltage, the load voltage is provided for the LED load to work. The LED load can be one LED, one LED string or a plurality of groups of LED strings. The common LED load has the functions of constant voltage, current limiting, dimming and the like. In this embodiment, the LED load includes a first LED string WLED1-WLEDM and a second LED string CLED1-CLEDM, for example, the first LED string is white light, and the second LED string CLED1-CLEDM is color light, so as to implement a dimming function in cooperation. One end of the first LED string WLED1-WLEDM is connected with the load voltage Vled, the other end of the first LED string WLED1-WLEDM is connected with one end of a first current limiting IC, the other end of the first current limiting IC is connected with a drain end of a first MOS tube Q1, a source end of the first MOS tube Q1 is connected with a ground SGND through a fifth resistor R5, the ground is a signal ground SGND, a gate end of the first MOS tube Q1 is connected with the singlechip through a seventh resistor R7, a first adjusting signal PWM1 provided by the singlechip is received, and the gate end of the first MOS tube Q1 is also connected with the source end of the first MOS tube Q1 through an eighth resistor R8; one end of the second LED string WLED1-WLEDM is connected with the load voltage Vled, the other end of the second LED string WLED1-WLEDM is connected with one end of a second current limiting IC, the other end of the second current limiting IC is connected with the drain end of a second MOS tube Q2, the source end of the second MOS tube Q2 is connected with the ground through a fifth resistor R5, the ground is a signal ground SGND, the gate end of the second MOS tube Q2 is connected with the singlechip through a sixth resistor R6 and receives a second regulating signal PWM2 provided by the singlechip, and the gate end of the second MOS tube Q2 is also connected with the source end of the second MOS tube Q2 through a ninth resistor R9; the LED load further comprises a third output capacitor EC3, one end of the third output capacitor EC3 is connected to the load voltage Vled, and the other end is connected to ground, which is the signal ground SGND. In this embodiment, the LED load has a dimming function, so the singlechip receives a control instruction sent by the external control module, generates adjustment signals PWM1 and PWM2, and sends the adjustment signals PWM1 and PWM2 to the source end of the first MOS transistor Q1 and the second MOS transistor Q2, so that the first LED string WLED1-WLEDM and the second LED string CLED1-CLEDM perform dimming. In addition, in this embodiment, the LED load further has a current limiting function, so the single chip microcomputer further includes a load current sampling end connected to the source end of the first MOS transistor Q1 and the source end of the second MOS transistor Q2, so as to sample currents flowing through the first LED string WLED1-WLEDM and the second LED string CLED1-CLEDM, and further generate adjustment signals PWM1 and PWM2, and send the adjustment signals PWM1 and PWM2 to the source end of the first MOS transistor Q1 and the second MOS transistor Q2 to perform current limiting in cooperation with the current limiting IC.
In addition, in this embodiment, the LED load further has a constant voltage function, so the LED driving power supply includes a feedback module. The feedback module comprises an optical coupler U2, and a first end of an input side of the optical coupler U2 is connected with the load voltage Vled through a tenth resistor R10; the second end of the input side of the optocoupler U2 is connected with the negative end of the voltage stabilizing tube U4, and the positive end of the voltage stabilizing tube U4 is connected with the ground SGND which is a signal line SGND; the regulating end of the voltage stabilizing tube U4 is connected with the load voltage Vled through a twelfth resistor R12, is connected with the negative end of the voltage stabilizing tube U4 through a third capacitor C3 and an eleventh resistor R11 which are sequentially connected in series, and is connected with the ground SGND through a thirteenth resistor R13 and a fourteenth resistor R14 which are sequentially connected in series, wherein the ground is a signal line SGND; the first end of the output side of the optical coupler U2 is connected with the main control module, the generated feedback signal is sent to the main control module, and the second end of the output side of the optical coupler U2 is connected with the ground PGND. The feedback module obtains the load voltage Vled as input, generates a corresponding feedback signal reflecting the load voltage Vled through the optocoupler U2, and sends the feedback signal to the main control module for constant voltage control adjustment.
The main control module comprises a main control chip U1, and the main control chip U1 obtains the working voltage required by the main control chip U1 from the transformer T1, so that the transformer T1 further comprises an auxiliary coil correspondingly. The second end of the main control chip U1 is a power end VCC, and is connected with the first end of the auxiliary coil of the transformer T1 through a second diode D2, and is also connected with the ground PGND through a first output capacitor EC1, and the second end of the auxiliary coil of the transformer T1 is connected with the ground PGND. The fifth end of the main control chip U1 is a driving end Drive, and is connected with the gate end of a fourth MOS tube Q4 through a fourth resistor R4, the drain end of the fourth MOS tube Q4 is connected with the second end of the primary coil of the transformer T1, and the source end of the fourth MOS tube Q4 is connected with the ground PGND through a first resistor R1. The sixth end of the main control chip U1 is a sampling end CS and is connected with the source end of the fourth MOS tube Q4 through a third resistor R3. The eighth end of the main control chip U1 is a feedback end FB and is connected with the feedback module to receive a feedback signal provided by the feedback module. In addition, the fourth end of the main control chip U1 is a high voltage end HV, and is connected with the high voltage direct current to detect the high voltage direct current.
The feedback signal that feedback module provided gets into main control chip U1 through main control chip U1's feedback end FB, main control chip U1 then produces control signal and exports through main control chip U1's Drive end Drive, through fourth resistance R4 and fourth MOS pipe cooperation, reentrant to transformer T1's primary, and then the adjustment transformer T1 output's load voltage's size. In the feedback module, a first end of an input side of the optocoupler is connected with the load voltage Vled to obtain the current magnitude of the load voltage Vled. When the load voltage Vled changes, corresponding different feedback signals are generated and sent to the main control module, and then the load voltage output by the transformer T1 is controlled to be adjusted in the opposite direction, so that constant voltage control of the LED load is realized.
The circuit formed by the voltage stabilizing tube U4 and other elements connected with the second end of the input side of the optocoupler U2 is essentially provided with a reference voltage. This difference in reference voltage also affects the starting point and the amplitude of the adjustment of the load voltage Vled. In the feedback module, the thirteenth resistor R13 and the fourteenth resistor R14 connected in series may be combined into one resistor in some cases. It may not be easy to find that the resistance of a specific resistor just meets the requirement of the actual parameters of the circuit in practical use, so that the two resistors (thirteenth resistor and fourteenth resistor) are connected in series, and the requirement is met relatively easily. On the basis of the present application, an adjusting module is further provided, and the adjusting module is connected in parallel to two ends of the thirteenth resistor R13 or the fourteenth resistor R14 (in this embodiment, the adjusting module is connected in parallel to two ends of the fourteenth resistor R14, which will be described later in this embodiment) and connected to the single chip microcomputer, and receives an adjusting signal output by the single chip microcomputer. When the singlechip receives a starting-up instruction, the singlechip outputs a first signal to the regulating module, the regulating module is in a first state (such as disconnection), the fourteenth resistor R14 is normally involved in working and is connected in series with the thirteenth resistor R13 in the whole circuit, and the main control module controls the load voltage output by the transformer to be in a first value according to a feedback signal provided by the feedback module; when the singlechip receives a standby instruction, the singlechip outputs a second signal to the regulating module, the regulating module is regulated to be in a second state (such as on), the fourteenth resistor R14 is short-circuited, only the thirteenth resistor R13 works in the whole circuit, and the main control module controls the load voltage output by the transformer to be in a second value according to a feedback signal provided by the feedback module. Because the required load voltage is relatively higher when the LED load needs to be turned on, the adjustment module is in the first state at this time, and the thirteenth resistor R13 or the fourteenth resistor R14 is connected in series in the circuit to operate, so that the reference voltage formed is higher, so that the load voltage Vled output by the transformer T1 is higher; when the LED load needs to be turned off in standby, the regulating module is in the second state, the fourteenth resistor R14 is shorted, only the thirteenth resistor R13 works in the circuit, the formed reference voltage is low, and the load voltage Vled output by the transformer T1 is also relatively low. Therefore, the first value is greater than the second value. Because the LED load does not need to be lightened at this time, the load voltage Vled at this time is reduced appropriately (because other modules (such as a singlechip) also need the compatible power supply of the load voltage Vled, the power supply cannot be completely turned off), and the standby power consumption can be reduced.
Specifically, the adjusting module includes a third MOS transistor Q3, two drain-source ends of the third MOS transistor Q3 are connected in parallel to two ends of the thirteenth resistor R13 or the fourteenth resistor R14 (in this embodiment, parallel to two ends of the fourteenth resistor R14), and a gate end of the third MOS transistor Q3 is connected to the single chip microcomputer through a twenty-first resistor R21, and receives an adjusting signal output by the single chip microcomputer. In a specific embodiment, the first signal is low, and the second signal is high; the first value of the load voltage Vled is 24V, and the second value of the load voltage Vled is 15V. Obviously, through the setting of the adjusting module, the standby power consumption of the LED driving power supply can be reduced.
Furthermore, the dimming adjusting signal output by the singlechip cannot be directly provided for the first MOS tube Q1 and the second MOS tube Q2 for use, so that the LED driving power supply further comprises a level conversion module and a linear voltage reduction module. The level conversion module is connected with the singlechip and the LED load, receives the regulating signals PWMW and PWMC output by the singlechip, converts the regulating signals into load regulating signals PWM1 and PWM2 adaptive to the LED load, and outputs the load regulating signals PWM1 and PWM2 to the LED load. The operating voltage required by the level shifting module is provided by the linear buck module. The linear voltage reduction module receives the load voltage Vled output by the transformer T1, reduces the load voltage Vled to the working voltage required by the level conversion module, and outputs the working voltage to the level conversion module. Since the level conversion module does not operate at the standby time, the level conversion module is not affected even if the load voltage Vled drops. Furthermore, the value of the working voltage required by the level conversion module is equal to the second value of the load voltage (for example, 15V), so that the voltages at two ends of the linear voltage reduction module are equal when in standby, the linear voltage reduction module does not work, and standby power consumption is further reduced.
In addition, the LED driving power supply further comprises a power supply module, wherein the power supply module is connected with the load voltage and outputs working voltages required by other modules (such as a singlechip) in the LED driving power supply. Specifically, the power supply module includes a power supply chip U3; the first end of the power chip U3 is a driving end GATE, the power chip U3 is connected with the GATE end of a fifth MOS tube Q5 through a twentieth resistor R20, the drain end of the fifth MOS tube is connected with the load voltage Vled, the source end of the fifth MOS tube Q5 is connected with the third end of the power chip U3, and the third end of the power chip U3 is a sampling end CS. The second end of the power chip U3 is a ground end GND, connected to the first end of the fifth inductor L5, further connected to the gate end of the fifth MOS transistor Q5 through an eighteenth resistor R18, further connected to the source end of the fifth MOS transistor Q5 through a nineteenth resistor R19, and further connected to a ground SGND, which is a signal ground SGND, through a fifth diode D5. The second end of the fifth inductor L5 is an output end of the power module, and is further connected to a ground SGND through a second output capacitor EC2, where the ground is a signal ground SGND. The fourth end of the power chip U3 is a feedback end FB, and is connected to the second end of the power chip U3 through a seventeenth resistor R17, and is further connected to the output end of the power module through a sixteenth resistor R16. The fifth end of the power chip U3 is a power end VCC, and is connected to the load voltage Vled through a fifteenth resistor R15, and is further connected to the second end of the power chip U3 through a fourth capacitor C4 and a second zener diode ZD2 that are connected in parallel. The working voltage required by the singlechip and other general modules is generally lower, such as 5V, so that even if the load voltage Vled is reduced to some extent during standby, the working voltage required by the singlechip can still be generated through the power supply module, and the normal operation of the singlechip is not influenced.
Finally, the LED driving power supply further comprises an external control interface, the single chip microcomputer is connected with the external control module through the external control interface, the single chip microcomputer is communicated with the external control interface through a WIFI mode, a Bluetooth mode, a Zigbe mode or a Dali mode, and the external control module comprises an APP, a remote control or a knob switch.
The application also provides an LED driving method, which uses the LED driving power supply, and comprises the following steps:
when the singlechip receives a starting-up instruction, the singlechip outputs a first signal to the regulating module, the regulating module is in a first state, and the main control module controls the load voltage output by the transformer to be in a first value according to a feedback signal provided by the feedback module; when the singlechip receives a standby instruction, the singlechip outputs a second signal to the adjusting module, the adjusting module is adjusted to be in a second state, and the main control module controls the load voltage output by the transformer to be in a second numerical value according to a feedback signal provided by the feedback module; the first value is greater than the second value.
The application also provides a lamp, which comprises an LED driving power supply and an LED load, wherein the LED driving power supply is the LED driving power supply.
The LED driving power supply, the driving method and the lamp have the following beneficial effects:
according to the LED driving power supply, the driving method and the lamp, the adjusting module is added on the feedback module, and the adjusting module is connected in parallel with two ends of one resistor in the feedback module; when the power-on is started, the regulating module is in a first state, such as disconnection, one resistor in the feedback module participates in work, and the main control module controls the load voltage output by the transformer to be in a first value according to a feedback signal provided by the feedback module; when the transformer is in standby, the regulating module is regulated to be in a second state, such as conduction, one resistor in the feedback module is short-circuited and does not participate in work, and the main control module controls the load voltage output by the transformer to be in a second value according to a feedback signal provided by the feedback module. Wherein the first value is greater than the second value, so standby power consumption is reduced. And at this time, the linear voltage reduction module for providing the working voltage for the level conversion module can also not work, so that the standby power consumption is further reduced.
The above describes in detail an LED driving power supply, a driving method and a lamp provided by the present application, and specific examples are applied herein to illustrate the principles and embodiments of the present application, where the above examples are only used to help understand the method and core ideas of the present application; meanwhile, as those skilled in the art will have modifications in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.
Claims (11)
1. An LED driving power supply, characterized in that the LED driving power supply comprises:
the rectification module is connected with external alternating current, receives the input of the external alternating current, and converts the input of the external alternating current into high-voltage direct current suitable for the LED driving power supply to be output;
the transformer is connected with the rectifying module, receives the high-voltage direct current input and outputs load voltage to the LED load for working;
the feedback module is connected with the transformer, receives the load voltage and outputs a feedback signal;
the main control module is connected with the feedback module and the transformer simultaneously, receives the feedback signal output by the feedback module, generates a control signal, and outputs the control signal to the transformer so as to adjust the load voltage;
the singlechip is connected with the external control module and the LED load, receives a control instruction sent by the external control module, generates an adjusting signal and outputs the adjusting signal to the LED load for adjustment; the method comprises the steps of,
the regulating module is connected with the singlechip and the feedback module, when the singlechip receives a starting-up instruction, the singlechip outputs a first signal to the regulating module, the regulating module is in a first state, and the main control module controls the load voltage output by the transformer to be in a first numerical value according to the feedback signal provided by the feedback module; when the singlechip receives a standby instruction, the singlechip outputs a second signal to the adjusting module, the adjusting module is adjusted to be in a second state, and the main control module controls the load voltage output by the transformer to be in a second numerical value according to a feedback signal provided by the feedback module; the first value is greater than the second value;
the feedback module comprises an optocoupler, and a first end of an input side of the optocoupler is connected with the load voltage through a tenth resistor; the second end of the input side of the optocoupler is connected with the negative end of the voltage stabilizing tube, and the positive end of the voltage stabilizing tube is connected with the ground; the regulating end of the voltage stabilizing tube is connected with the load voltage through a twelfth resistor, is connected with the negative end of the voltage stabilizing tube through a third capacitor and an eleventh resistor which are sequentially connected in series, and is connected with the ground through a thirteenth resistor and a fourteenth resistor which are sequentially connected in series; the first end of the output side of the optical coupler is connected with the main control module, the generated feedback signal is sent to the main control module, and the second end of the output side of the optical coupler is connected with the ground; the adjusting module comprises a third MOS tube, the drain and source ends of the third MOS tube are connected in parallel with the two ends of the thirteenth resistor or the fourteenth resistor, and the gate end of the third MOS tube is connected with the singlechip through the twenty-first resistor.
2. The LED driving power supply of claim 1, further comprising a level conversion module and a linear buck module; the level conversion module is connected with the singlechip and the LED load, receives the adjusting signal output by the singlechip, converts the adjusting signal into a load adjusting signal suitable for the LED load, and outputs the load adjusting signal to the LED load; the linear voltage reduction module receives the load voltage output by the transformer, reduces the load voltage to the working voltage required by the level conversion module and outputs the working voltage to the level conversion module; the value of the working voltage required by the level conversion module is equal to the second value of the load voltage.
3. The LED driving power supply of claim 1, further comprising a power module connected to the load voltage for outputting an operating voltage required by other modules in the LED driving power supply.
4. The LED driving power supply of claim 3, wherein the power module comprises a power chip; the first end of the power chip is a driving end and is connected with the gate end of a fifth MOS tube through a twentieth resistor, the drain end of the fifth MOS tube is connected with the load voltage, the source end of the fifth MOS tube is connected with the third end of the power chip, and the third end of the power chip is a sampling end; the second end of the power supply chip is a grounding end and is connected with the first end of a fifth inductor, the power supply chip is also connected with the gate end of the fifth MOS tube through an eighteenth resistor, is also connected with the source end of the fifth MOS tube through a nineteenth resistor, is also connected with the ground through a fifth diode, and the second end of the fifth inductor is the output end of the power supply module and is also connected with the ground through a second output capacitor; the fourth end of the power chip is a feedback end and is connected with the second end of the power chip through a seventeenth resistor and is also connected with the output end of the power module through a sixteenth resistor; the fifth end of the power chip is a power end and is connected with the load voltage through a fifteenth resistor, and the fifth end of the power chip is also connected with the second end of the power chip through a fourth capacitor and a second zener diode which are connected in parallel.
5. The LED driving power supply of claim 1, wherein the transformer comprises a primary coil and a secondary coil; the first end of the primary coil of the transformer is connected with the rectifying module, receives the high-voltage direct current, and is connected with the second end of the primary coil of the transformer through a first capacitor and a first diode which are sequentially connected in series, and two ends of the first capacitor are also connected with a second resistor in parallel; the first end of the secondary coil of the transformer outputs the load voltage through a third diode and a fourth diode which are connected in parallel, and the second end of the secondary coil of the transformer is connected with the ground.
6. The LED driving power supply of claim 5, wherein the main control module comprises a main control chip, and the transformer further comprises an auxiliary coil; the second end of the main control chip is a power end and is connected with the first end of the auxiliary coil of the transformer through a second diode and is also connected with the ground through a first output capacitor; the fifth end of the main control chip is a driving end and is connected with the gate end of a fourth MOS tube through a fourth resistor, the drain end of the fourth MOS tube is connected with the second end of the primary coil of the transformer, and the source end of the fourth MOS tube is connected with the ground through a first resistor; the sixth end of the main control chip is a sampling end and is connected with the source end of the fourth MOS tube through a third resistor; the eighth end of the main control chip is a feedback end and is connected with the feedback module; the fourth end of the main control chip is a high-voltage end and is connected with the high-voltage direct current.
7. The LED driving power supply according to claim 1, wherein the rectifying module includes an EMI filtering unit and a bridge rectifying unit; the input side of the EMI filtering unit is connected with the external alternating current, and the output side of the EMI filtering unit is connected with the input side of the bridge rectifying unit; the first end of the output side of the bridge rectifier unit outputs the high-voltage direct current and is connected with the second end of the output side of the bridge rectifier unit through a second capacitor, and the second end of the output side of the bridge rectifier unit is connected with the ground.
8. The LED driving power supply of claim 1, wherein the LED load comprises a first LED string, a second LED string; one end of the first LED string is connected with the load voltage, the other end of the first LED string is connected with one end of a first current limiting IC, the other end of the first current limiting IC is connected with the drain end of a first MOS tube, the source end of the first MOS tube is connected with the ground through a fifth resistor, the gate end of the first MOS tube is connected with the singlechip through a seventh resistor, a first adjusting signal provided by the singlechip is received, and the gate end of the first MOS tube is also connected with the source end of the first MOS tube through an eighth resistor; one end of the second LED string is connected with the load voltage, the other end of the second LED string is connected with one end of a second current limiting IC, the other end of the second current limiting IC is connected with the drain end of a second MOS tube, the source end of the second MOS tube is connected with the ground through a fifth resistor, the gate end of the second MOS tube is connected with the singlechip through a sixth resistor, a second adjusting signal provided by the singlechip is received, and the gate end of the second MOS tube is also connected with the source end of the second MOS tube through a ninth resistor; the LED load further comprises a third output capacitor, one end of the third output capacitor is connected with the load voltage, and the other end of the third output capacitor is connected with the ground; the singlechip also comprises a load current sampling end which is connected with the source end of the first MOS tube and the source end of the second MOS tube.
9. The LED driving power supply according to claim 1, further comprising an external control interface, wherein the single-chip microcomputer is connected to the external control module through the external control interface, the single-chip microcomputer communicates with the external control interface through WIFI, bluetooth, zigbee or Dali, and the external control module comprises an APP, a remote control or a rotary switch.
10. An LED driving method using the LED driving power supply according to any one of claims 1 to 9, comprising:
when the singlechip receives a starting-up instruction, the singlechip outputs a first signal to the regulating module, the regulating module is in a first state, and the main control module controls the load voltage output by the transformer to be in a first value according to a feedback signal provided by the feedback module; when the singlechip receives a standby instruction, the singlechip outputs a second signal to the adjusting module, the adjusting module is adjusted to be in a second state, and the main control module controls the load voltage output by the transformer to be in a second numerical value according to a feedback signal provided by the feedback module; the first value is greater than the second value.
11. A luminaire comprising an LED driving power supply and an LED load, characterized in that the LED driving power supply is an LED driving power supply as claimed in any one of claims 1-9.
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