CN110351924A - A kind of LED drive circuit of low standby power loss - Google Patents
A kind of LED drive circuit of low standby power loss Download PDFInfo
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- CN110351924A CN110351924A CN201910500734.9A CN201910500734A CN110351924A CN 110351924 A CN110351924 A CN 110351924A CN 201910500734 A CN201910500734 A CN 201910500734A CN 110351924 A CN110351924 A CN 110351924A
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- boost
- 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
- H05B45/37—Converter circuits
-
- 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]
- H05B45/40—Details of LED load circuits
- H05B45/44—Details of LED load circuits with an active control inside an LED matrix
Abstract
The invention discloses a kind of LED drive circuits of low standby power loss, including current rectifying and wave filtering circuit, Boost-CV constant voltage circuit, BUCK-CV constant voltage circuit, reduction voltage circuit, MCU control circuit, decompression/electrodeless two-way complementary circuit DC-DC voltage-stablizer and electronic switching circuit, Boost-CV constant voltage circuit is realized using APFC Boost control chip and its peripheral circuit, reduction voltage circuit is realized using low PF Buck chip and its peripheral circuit, decompression/electrodeless two-way complementary circuit is realized using Buck chip/electrodeless two-way complementary chip and its peripheral circuit, DC-DC voltage-stablizer is MCU control circuit power supply, BUCK-CV constant voltage circuit is respectively that APFC Boost controls chip after passing through electronic switching circuit, low PF Buck chip and Buck chip/electrodeless two-way complementary chip provide operating voltage, and MCU control module can control electronic switching circuit cut-off in standby mode, and electronic switching circuit conducting is controlled in working condition；It is that can control IC unit line in it not work that advantage, which is in standby mode, reduces stand-by power consumption, economizes on resources.
Description
Technical field
The present invention relates to a kind of LED drive circuits, more particularly, to a kind of LED drive circuit of low standby power loss.
Background technique
Intelligent lighting (Smart Lighting) product has outstanding light modulation toning performance, is current LED lighting technology
One of the prior development direction in field.Compared with traditional lighting products, the communication of intelligent lighting product integration, sensing and sensing etc.
Function, illumination performance are more excellent.But intelligent lighting product circuit framework is many and diverse, unit line is more, each modular circuit to
Inevitably there is power consumption when machine, get off for a long time, stand-by power consumption is very big.The stand-by power consumption problem of intelligent lighting product is
Industry attention has been obtained, higher requirement has been done to the stand-by power consumption of LED drive circuit in existing Energy Efficiency Standard.
LED drive circuit is the core component of intelligent lighting product.The structural block diagram of existing LED drive circuit such as Fig. 1
Shown, circuit diagram is as shown in Figure 2.The LED drive circuit is by current rectifying and wave filtering circuit, Boost-CV constant voltage circuit, BUCK-CV constant pressure
Circuit, LDO voltage stabilizer, reduction voltage circuit, MCU control circuit and decompression/electrodeless two-way complementary circuit composition, Boost-CV constant pressure electricity
Road is using APFC Boost control chip IC 1 and its peripheral circuit (inductance L1, diode D1, metal-oxide-semiconductor M1, resistance R1, capacitor C1
Realize that reduction voltage circuit is realized using low PF Buck chip IC 2 and its peripheral circuit (resistance R2 and capacitor C2), drop with electrolysis P1)
Pressure/electrodeless two-way complementary circuit uses Buck chip/electrodeless two-way complementary chip IC3 and its peripheral circuit (resistance R3 and capacitor
C3 it) realizes, 3 as LED drive circuit of Boost-CV constant voltage circuit, reduction voltage circuit and decompression/electrodeless two-way complementary circuit
IC unit line, MCU control circuit are main driving circuit, for generating two-way pwm signal (PWM1 and PWM2) control decompression electricity
Road and decompression/electrodeless two-way complementary circuit output electric current, to realize light modulation toning.In Fig. 2, VCC1 is APFC Boost control
The supply voltage of coremaking piece IC1, loads the power end in APFC Boost control chip IC 1, and VCC2 is low PF Buck chip
The supply voltage of IC2, loads the power end in PF Buck chip IC 2, and VCC3 is Buck chip/electrodeless two-way complementary chip IC3
Supply voltage, load in Buck chip/electrodeless two-way complementary chip IC3 power end.When standby, because 3 IC are from bus
Pull down resistor power supply, 3 IC power supply lines are still working, and cannot be completely eliminated operably power consumption, and APFC Boost controls core
Piece IC1 by bus VM (voltage specifically sees that driver circuit opens up benefit generally in 300~450Vdc) use pull down resistor R1 to
It is powered, and for low PF Buck chip IC 2 by using pull down resistor R2 to supply power for from VM, electrodeless two-way complementary chip IC3 is logical
It crosses and is supplied power for from VM using pull down resistor R3.In general, pass through electric current needed for resistive pull-downs when chip works normally
In 1-2MA, power consumption is 0.1~0.25W not equal (resistance value is chosen according to the size of driving power when designing), except drop-down electricity
The loss of (R1, R2, R3) is hindered, equally there is also losses for chip (IC1, IC2, IC3) inside and other peripheral components, thus cause
Existing LED drive circuit power consumption when standby is larger, causes the more wasting of resources.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of LED drive circuit of low standby power loss, LED driving electricity
Road is that can control IC unit line in it not work in standby mode, reduces stand-by power consumption, economizes on resources.
The technical scheme of the invention to solve the technical problem is: a kind of LED drive circuit of low standby power loss,
Current rectifying and wave filtering circuit including the direct voltage output for the alternating voltage of alternating current to be converted to pulsation, be used for will be described whole
The DC voltage of stream filter circuit output carries out boosting and handles to obtain the Boost-CV constant voltage circuit of voltage boosting dc voltage, is used to incite somebody to action
The DC voltage of the current rectifying and wave filtering circuit output obtains the BUCK-CV constant pressure electricity of a constant voltage after carrying out constant pressure processing
Road, reduction voltage circuit, MCU control circuit and decompression/electrodeless two-way complementary circuit, the MCU control circuit generate two-way PWM letter
Number, pwm signal is used to control the output electric current of the reduction voltage circuit all the way, and another way pwm signal is used to control the drop
Pressure/electrodeless two-way complementary circuit output electric current, the Boost-CV constant voltage circuit using APFC Boost control chip and
Its peripheral circuit realizes that the reduction voltage circuit is realized using low PF Buck chip and its peripheral circuit, the decompression/nothing
Pole two-way complementary circuit is using Buck chip/electrodeless two-way complementary chip and its peripheral circuit realization, the LED drive circuit
It further include DC-DC voltage-stablizer and electronic switching circuit, the DC-DC voltage-stablizer is used for the BUCK-CV constant voltage circuit
It is the MCU control circuit power supply, the constant electricity of the BUCK-CV constant voltage circuit output after the constant voltage conversion of output
Pressure is by being respectively that the APFC Boost controls chip, the low PF Buck chip after the electronic switching circuit
Operating voltage is provided with the Buck chip/electrodeless two-way complementary chip, the MCU control module can be in standby mode
When the control electronic switching circuit cut-off, the electronic switching circuit conducting is controlled in working condition.
The electronic switching circuit includes first resistor, second resistance, 3rd resistor, first diode, the one or three pole
Pipe, the first metal-oxide-semiconductor and first capacitor；The control terminal of the just extremely described electronic switching circuit of the first diode, institute
The control terminal for the electronic switching circuit stated is connect with the MCU control circuit, accesses opening for the MCU control circuit output
Control signal is closed, the cathode of the first diode is connected with one end of the first resistor, the first resistor
The other end, the second resistance one end connected with the grid of first metal-oxide-semiconductor, the second resistance it is another
End, first metal-oxide-semiconductor source electrode connect with one end of the first capacitor and its connecting pin ground connection, described first
The drain electrode of metal-oxide-semiconductor, one end of the 3rd resistor, the other end of the first capacitor and first triode base
Pole connection, the other end of the 3rd resistor is connected with the collector of first triode and connecting pin is the electricity
The input terminal of sub switch circuit, the input terminal access of the electronic switching circuit Boost-CV constant voltage circuit output
Constant voltage, the output end of the extremely described electronic switching circuit of the transmitting of first triode, the electronic switch
The output end of circuit controls the power end of chip, the power supply of the low PF Buck chip with the APFC Boost respectively
End is connected with the Buck chip/electrodeless two-way complementary chip power end.In the circuit, when the MCU of LED drive circuit is controlled
Circuit processed is connected to when turning off the light signal, and MCU control circuit exports high-level control signal, the anode access MCU control of first diode
The high-level control signal (generally 3.3V or 5V signal) of circuit output processed, which passes through first diode
The grid of the first metal-oxide-semiconductor is loaded into first resistor, the first metal-oxide-semiconductor enters saturation conduction state, the base of the first triode at this time
Pole tension is pulled down to zero, and the base stage no current of the first triode, the emitter and collector of the first triode is reverse-biased, and the one or three
Pole pipe cut-off, the emitter Non voltage output of the first triode, electronic switching circuit ends at this time, and APFC Boost controls core
Piece, low PF Buck chip and Buck chip/electrodeless two-way complementary chip unpowered voltage and turn off, LED drive circuit enter it is low
Energy consumption standby module, when the MCU control circuit of LED drive circuit, which is connected to, turns on light signal, MCU control circuit exports low level control
Signal processed, the low level control signal (usually 0V) of the anode access MCU control circuit output of first diode, at this time first
Metal-oxide-semiconductor shutdown, the base stage of the first triode have base current, the emitter junction and collector junction of the first triode by 3rd resistor
Positively biased, the first triode saturation is open-minded, and the emitter of the first triode has voltage output, and electronic switching circuit is connected at this time,
APFC Boost control chip, low PF Buck chip and Buck chip/electrodeless two-way complementary chip have supply voltage to restore normal
Work, electronic switching circuit of the invention build composition using discrete device, and structure is simple, and cost is relatively low, and are controlled based on MCU
Zero loss of each unit route when the control signal of circuit output realizes standby, control process is simple, high reliablity.
The peripheral circuit of the described APFC Boost control chip include the first inductance, the second diode, the second metal-oxide-semiconductor,
Second capacitor and electrolytic capacitor, one end of first inductance is the input terminal of the Boost-CV constant voltage circuit, described
Boost-CV constant voltage circuit the input terminal access current rectifying and wave filtering circuit output DC voltage, first inductance
The other end, second diode anode connected with the drain electrode of second metal-oxide-semiconductor, second metal-oxide-semiconductor
Grid is connected with the output end of APFC Boost control chip, the cathode of second diode and the electrolysis
Output end of the anode connection and its connecting pin of capacitor for the Boost-CV constant voltage circuit, the Boost-CV constant pressure electricity
The output end on road respectively with the input terminal and the Buck chip/electrodeless two-way complementary chip of the low PF Buck chip
Input terminal connection, one end of second capacitor is connect with the APFC Boost power end for controlling chip, described
The other end of the second capacitor and the cathode of the electrolytic capacitor be grounded；The peripheral circuit of the low PF Buck chip
Including third capacitor, one end of the third capacitor is connected with the power end of the low PF Buck chip, the third
The other end of capacitor is grounded；The Buck chip/electrodeless two-way complementary chip peripheral circuit includes the 4th capacitor, described
One end of 4th capacitor is connected with the Buck chip/electrodeless two-way complementary chip power end, the 4th capacitor
Other end ground connection.The circuit is omitted three pull down resistors, further simplifies circuit structure relative to existing product, reduces
Overall power and cost.
Compared with the prior art, the advantages of the present invention are as follows by DC-DC voltage-stablizer and electronic switching circuit, DC-DC is steady
Depressor replaces LDO voltage stabilizer in the prior art, into MCU control after the constant voltage that BUCK-CV constant voltage circuit exports is converted
Circuit power supply, electronic switching circuit setting control chip, low PF Buck chip in BUCK-CV constant voltage circuit and APFC Boost
And between Buck chip/electrodeless two-way complementary chip, the constant voltage of BUCK-CV constant voltage circuit output is powered-down by electronic cutting
It is respectively that APFC Boost control chip, low PF Buck chip and Buck chip/electrodeless two-way complementary chip provide work behind road
Voltage, MCU control module can control electronic switching circuit conducting in working condition makes APFC Boost control chip, low PF
Buck chip and Buck chip/electrodeless two-way complementary chip work normally, and electronic switching circuit cut-off is controlled in standby mode
APFC Boost control chip, low PF Buck chip and Buck chip/electrodeless two-way complementary chip is set to enter zero standby power consumption mould
Formula, thus the present invention is that can control IC unit line in it not work in standby mode, reduces stand-by power consumption, economizes on resources.
Detailed description of the invention
Fig. 1 is the structural block diagram of existing LED drive circuit；
Fig. 2 is the circuit diagram of existing LED drive circuit；
Fig. 3 is the structural block diagram of LED drive circuit of the invention；
Fig. 4 is the circuit diagram of the electronic switching circuit of LED drive circuit of the invention；
Fig. 5 is the circuit diagram of LED drive circuit of the invention.
Specific embodiment
The present invention will be described in further detail below with reference to the embodiments of the drawings.
Embodiment: as shown in figure 3, a kind of LED drive circuit of low standby power loss, including for by the alternating voltage of alternating current
Be converted to the current rectifying and wave filtering circuit of the direct voltage output of pulsation, the DC voltage for exporting current rectifying and wave filtering circuit rises
Pressure handles to obtain the Boost-CV constant voltage circuit of voltage boosting dc voltage, the DC voltage progress for exporting current rectifying and wave filtering circuit
BUCK-CV constant voltage circuit, reduction voltage circuit, MCU control circuit and decompression/electrodeless two-way of a constant voltage are obtained after constant pressure processing
Complementary circuit, MCU control circuit generate two-way pwm signal, and pwm signal is used to control the output electric current of reduction voltage circuit all the way, separately
Pwm signal uses APFC for controlling decompression/electrodeless two-way complementary circuit output electric current, Boost-CV constant voltage circuit all the way
Boost controls chip IC 1 and its peripheral circuit is realized, reduction voltage circuit is real using low PF Buck chip IC 2 and its peripheral circuit
Existing, decompression/electrodeless two-way complementary circuit is realized using Buck chip/electrodeless two-way complementary chip IC3 and its peripheral circuit, LED
Driving circuit further includes DC-DC voltage-stablizer and electronic switching circuit, and DC-DC voltage-stablizer is for exporting BUCK-CV constant voltage circuit
Constant voltage convert after into MCU control circuit power supply, BUCK-CV constant voltage circuit output constant voltage by electronic cutting it is powered-down
It is respectively APFC Boost control chip IC 1, low PF Buck chip IC 2 and Buck chip/electrodeless two-way complementary chip behind road
IC3 provides operating voltage, and MCU control module can control electronic switching circuit cut-off in standby mode, in working condition
Control electronic switching circuit conducting.
In the present embodiment, as shown in figure 4, electronic switching circuit includes first resistor R1, second resistance R2,3rd resistor
R3, first diode D1, the first triode Q1, the first metal-oxide-semiconductor M1 and first capacitor C1；The just extremely electronics of first diode D1
The control terminal of the control terminal of switching circuit, electronic switching circuit is connect with MCU control circuit, access MCU control circuit output
The cathode of switch control signal, first diode D1 is connected with one end of first resistor R1, the other end of first resistor R1, second
One end of resistance R2 is connected with the grid of the first metal-oxide-semiconductor M1, the other end of second resistance R2, the source electrode of the first metal-oxide-semiconductor M1 and
One end of one capacitor C1 connects and its connecting pin is grounded, the drain electrode of the first metal-oxide-semiconductor M1, one end of 3rd resistor R3, first capacitor
The collector of the connection of the base stage of the other end of C1 and the first triode Q1, the other end of 3rd resistor R3 and the first triode Q1 connect
It connects and connecting pin is the input terminal of electronic switching circuit, the input terminal access Boost-CV constant voltage circuit output of electronic switching circuit
Constant voltage, the output end of the transmitting extremely electronic switching circuit of the first triode Q1, the output end point of electronic switching circuit
The power end of chip IC 1, the power end and Buck chip/electrodeless two-way of low PF Buck chip IC 2 are not controlled with APFC Boost
The power end of complementary chip IC3 connects.
In the present embodiment, as shown in figure 5, the peripheral circuit of APFC Boost control chip IC 1 includes the first inductance L1, the
Two diode D2, the second metal-oxide-semiconductor M2, the second capacitor C2 and electrolytic capacitor P1, the first inductance L1 one end be Boost-CV constant pressure
The input terminal of circuit, the DC voltage of the input terminal access current rectifying and wave filtering circuit output of Boost-CV constant voltage circuit, the first inductance
The drain electrode of the other end of L1, the anode of the second diode D2 and the second metal-oxide-semiconductor M2 connects, the grid and APFC of the second metal-oxide-semiconductor M2
Boost controls the output end connection of chip IC 1, the anode connection and its connection of the cathode and electrolytic capacitor P1 of the second diode D2
End be Boost-CV constant voltage circuit output end, the output end of Boost-CV constant voltage circuit respectively with low PF Buck chip IC 2
Input terminal is connected with Buck chip/electrodeless two-way complementary chip IC3 input terminal, one end of the second capacitor C2 and APFC Boost
The power end connection of chip IC 1 is controlled, the other end of the second capacitor C2 and the cathode of electrolytic capacitor P1 are grounded；Low PF Buck
The peripheral circuit of chip IC 2 includes third capacitor C3, the power end company of one end of third capacitor C3 and low PF Buck chip IC 2
It connects, the other end ground connection of third capacitor C3；Buck chip/electrodeless two-way complementary chip IC3 peripheral circuit includes the 4th capacitor
One end of C4, the 4th capacitor C4 are connected with Buck chip/electrodeless two-way complementary chip IC3 power end, and the 4th capacitor C4's is another
One end ground connection.
Claims (3)
1. a kind of LED drive circuit of low standby power loss, including the direct current for the alternating voltage of alternating current to be converted to pulsation
The current rectifying and wave filtering circuit of output is pressed, handles for the DC voltage of the described current rectifying and wave filtering circuit output to be carried out boosting and is risen
Press the Boost-CV constant voltage circuit of DC voltage, for carrying out the DC voltage of the current rectifying and wave filtering circuit output at constant pressure
BUCK-CV constant voltage circuit, reduction voltage circuit, MCU control circuit and decompression/electrodeless two-way complementary electrical of a constant voltage are obtained after reason
Road, the MCU control circuit generate two-way pwm signal, and pwm signal is used to control the output electricity of the reduction voltage circuit all the way
Stream, another way pwm signal are used to control decompression/electrodeless two-way complementary circuit output electric current, the Boost-CV
Constant voltage circuit realizes that the reduction voltage circuit uses low PF Buck core using APFC Boost control chip and its peripheral circuit
Piece and its peripheral circuit realize, the decompression/electrodeless two-way complementary circuit using Buck chip/electrodeless two-way complementary chip and
Its peripheral circuit is realized, it is characterised in that the LED drive circuit further includes DC-DC voltage-stablizer and electronic switching circuit, institute
The DC-DC voltage-stablizer stated is used to after converting the constant voltage that the BUCK-CV constant voltage circuit exports be that the MCU is controlled
Circuit power supply, the constant voltage of the BUCK-CV constant voltage circuit output is by being respectively institute after the electronic switching circuit
APFC Boost control chip, the low PF Buck chip and the Buck chip/electrodeless two-way complementary chip stated mention
For operating voltage, the MCU control module can control the electronic switching circuit cut-off in standby mode, work
The electronic switching circuit conducting is controlled when state.
2. a kind of LED drive circuit of low standby power loss according to claim 1, it is characterised in that the electronic switch
Circuit includes first resistor, second resistance, 3rd resistor, first diode, the first triode, the first metal-oxide-semiconductor and first capacitor；
The control terminal of the just extremely described electronic switching circuit of the first diode, the control terminal of the electronic switching circuit
It is connect with the MCU control circuit, accesses the switch control signal of the MCU control circuit output, the described the 1st
The cathode of pole pipe is connected with one end of the first resistor, the other end of the first resistor, the second resistance
One end is connected with the grid of first metal-oxide-semiconductor, the source electrode of the other end of the second resistance, first metal-oxide-semiconductor
It is connected with one end of the first capacitor and its connecting pin is grounded, the drain electrode of first metal-oxide-semiconductor, the 3rd resistor
One end, the first capacitor the other end connected with the base stage of first triode, the 3rd resistor it is another
One end is connected with the collector of first triode and connecting pin is the input terminal of the electronic switching circuit, described
The constant voltage of the input terminal access of the electronic switching circuit Boost-CV constant voltage circuit output, first triode
The extremely described electronic switching circuit of transmitting output end, the output end of the electronic switching circuit respectively with it is described
The power end of APFC Boost control chip, the power end of the low PF Buck chip and the Buck chip/electrodeless double
The power end of road complementary chip connects.
3. a kind of LED drive circuit of low standby power loss according to claim 1, it is characterised in that the APFC
The peripheral circuit that Boost controls chip includes the first inductance, the second diode, the second metal-oxide-semiconductor, the second capacitor and electrolytic capacitor,
One end of first inductance is the input terminal of the Boost-CV constant voltage circuit, the Boost-CV constant voltage circuit
The DC voltage of the input terminal access current rectifying and wave filtering circuit output, the other end of first inductance, described second
The anode of diode is connected with the drain electrode of second metal-oxide-semiconductor, the grid and the APFC of second metal-oxide-semiconductor
Boost controls the output end connection of chip, the anode connection of the cathode of second diode and the electrolytic capacitor and
Its connecting pin be the Boost-CV constant voltage circuit output end, the output end of the Boost-CV constant voltage circuit respectively with
The input terminal of the low PF Buck chip is connected with the Buck chip/electrodeless two-way complementary chip input terminal, described
One end of the second capacitor connect with the power end of the described APFC Boost control chip, the other end of second capacitor
It is grounded with the cathode of the electrolytic capacitor；The peripheral circuit of the low PF Buck chip includes third capacitor, described
One end of third capacitor is connected with the power end of the low PF Buck chip, the other end ground connection of the third capacitor；Institute
The Buck chip stated/electrodeless two-way complementary chip peripheral circuit includes the 4th capacitor, one end of the 4th capacitor and institute
The connection of the Buck chip stated/electrodeless two-way complementary chip power end, the other end ground connection of the 4th capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910500734.9A CN110351924B (en) | 2019-06-11 | 2019-06-11 | LED drive circuit with low standby power consumption |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910500734.9A CN110351924B (en) | 2019-06-11 | 2019-06-11 | LED drive circuit with low standby power consumption |
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| Publication Number | Publication Date |
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| CN110351924A true CN110351924A (en) | 2019-10-18 |
| CN110351924B CN110351924B (en) | 2021-11-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910500734.9A Active CN110351924B (en) | 2019-06-11 | 2019-06-11 | LED drive circuit with low standby power consumption |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112040603A (en) * | 2020-09-25 | 2020-12-04 | 福州大学 | BPSK visible light communication modulation single-stage LED driving circuit and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112040603A (en) * | 2020-09-25 | 2020-12-04 | 福州大学 | BPSK visible light communication modulation single-stage LED driving circuit and method |
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| Publication number | Publication date |
|---|---|
| CN110351924B (en) | 2021-11-23 |
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