CN109257845A - A kind of the LED power supply and its adjusting method of changeable frequency - Google Patents
A kind of the LED power supply and its adjusting method of changeable frequency Download PDFInfo
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- CN109257845A CN109257845A CN201811118152.6A CN201811118152A CN109257845A CN 109257845 A CN109257845 A CN 109257845A CN 201811118152 A CN201811118152 A CN 201811118152A CN 109257845 A CN109257845 A CN 109257845A
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Classifications
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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 [LEDs]
- H05B45/30—Driver circuits
- H05B45/395—Linear regulators
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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]
Abstract
The invention discloses the LED power supplies and its adjusting method of a kind of changeable frequency, including controller, battery, AC power supplies, bias voltage control circuit, linear current driving circuit, rectification circuit；The battery gives the controller and the linear current drive circuitry, the bias voltage control circuit is connected in parallel on the AC power supplies, bias voltage is exported to the linear current driving circuit, after the linear current driving circuit driving half-bridge circuit, to adjust the frequency of out-put supply, powered by rectification circuit to multiple LED.The present invention can carry out changeable frequency operation according to AC power supplies, and the frequency adjustment for adapting to AC power supplies is output to the frequency of LED, improve the stability of power supply.
Description
Technical field
The present invention relates to technical field of LED illumination, a kind of LED power supply in particular to changeable frequency and its
Adjusting method.
Background technique
LED has the remarkable advantages such as fast response time, low-power consumption, energy conservation, service life length.Due to the rapid response speed of LED,
Especially suitable for the application of automobile brake lamp and turn signal, the traffic accidents probability such as rear-end collision can be reduced.With half
The raising of conductor material and packaging technology, the luminous flux and light extraction efficiency of LED light source are gradually increased, and LED light source is answered extensively
For the special lightings such as traffic lights, automotive lighting, billboard field.LED actuation techniques also with LED application technology development and
Gradually it is developed.
Most of LED light driving power is all the work electricity that LED light is controlled using the method for control metal-oxide-semiconductor grid voltage
Stream makes LED light work under reasonable operating current state, can extend the service life of LED light, but LED light driving is electric
Source other than providing energy to LED light, itself also needs to consume the energy of a part in the operating condition, and power consumption is got over
More, the temperature of driving power itself is higher.And the temperature of driving power mainly as caused by metal-oxide-semiconductor, the temperature of metal-oxide-semiconductor and
Conducting resistance, switching frequency, instantaneous short circuit are current related.If the temperature of driving power is excessively high, will affect LED light uses the longevity
Life.
In order to control LED frequency jitter, the stability of driving power, the accurate adjusting of control frequency appropriate are improved
It is highly desirable.
Summary of the invention
The invention proposes a kind of LED power supplies of changeable frequency, including controller, battery, AC power supplies, bias voltage
Control circuit, linear current driving circuit, rectification circuit；The battery gives the controller and the linear current driving circuit
Power supply, the bias voltage control circuit are connected in parallel on the AC power supplies, are exported bias voltage and are given linear current driving electricity
Road, after the linear current driving circuit drives half-bridge circuit, to adjust the frequency of out-put supply, by rectification circuit to multiple
LED power supply.
The power supply, the battery is rechargeable battery, by charging circuit from the rectification circuit outlet side
It charges.
The power supply, the bias voltage control circuit include resistance R1-R5, capacitor C1-C2, transistor T1-
T2, wherein resistance R4 is potentiometer, carries out current potential adjusting according to the control signal of the controller；One end of the resistance R1 connects
The anode in the AC power supplies is connect, the other end is connected to one end of resistance R2, the negative terminal of the other end connection AC power supplies of resistance R2；
One end of one end connection the resistance R3 and capacitor C1 of resistance R2, the negative terminal of another termination power of capacitor C1, resistance R3's is another
The control terminal of the control terminal of end connection transistor T1 and one of non-controlling end and transistor T2, transistor T1's is another
Non-controlling end connects one end of resistance R5, the negative terminal of another termination power of resistance R5；One end connection transistor of resistance R5
One non-controlling end, one end of another non-controlling end connection resistance R4 of transistor T2, the other end connection capacitor C2's of resistance R4
One end；The current potential of the resistance R4 adjusts control terminal and connects controller, and the control signal for receiving the controller carries out current potential tune
Section.
The power supply, the linear current driving circuit include transistor G1, G2, resistance R5-R8, comparison circuit
U1, wherein the other end of the control terminal connection capacitor C2 of the transistor G1, a non-controlling end of transistor G1 connect battery, separately
One non-controlling end connects one end of resistance R6, the negative terminal of the other end connection power supply of resistance R6；The mono- non-controlling end transistor G2 connects
Battery is connect, one end of another non-controlling end connection resistance R7, one end of the other end connection resistance R8 of resistance R7, resistance R8's is another
One end connects the negative terminal of power supply, and resistance R8 is controllable resistor, and control terminal is connect with the controller；The comparison circuit U1
Two input terminals be separately connected another non-controlling end of the transistor G1 and transistor G2, output end connects the half-bridge circuit
Control terminal；The control terminal of transistor G2 is connected to the output end of half-bridge circuit.
The power supply, the half-bridge circuit include transistor G3, G4, the wherein control of transistor G3 and transistor G4
End processed connects the output end of the comparison circuit U1, the anode of the non-controlling end connection power supply of transistor G3, another non-controlling
One end of end connection transistor G4, the negative terminal of the other end connection power supply of transistor G4；The output of half-bridge circuit is arranged in crystal
Connecting pin between pipe G3 and the G4 of transistor, the control terminal of the transistor G2 be connected to transistor G3 and transistor G4 it
Between connecting pin, by the linear current driving circuit control half-bridge circuit switching frequency so that output frequency is adjustable.
The power supply, including SCC circuit, it is described between the SCC circuit connection half-bridge circuit and rectification circuit
SCC circuit includes capacitor C3, C4, transistor G5；One end of output end connection capacitor C3, C4 of the half-bridge circuit, capacitor C3
The other end connection transistor G5 a non-controlling end, transistor G5 another non-controlling end connection capacitor C4 the other end and
One input terminal of rectification circuit, the anode of power supply are connected to another input terminal of rectification circuit by inductance L1；Rectification circuit is defeated
Outlet shunt capacitance C5.
The power supply, the transistor T1-T2 are triode, and transistor G1-G5 is metal-oxide-semiconductor.
The power supply, the power supply are arranged in PCB circuit board, and the controller, battery, biased electrical are voltage-controlled
The left side of circuit processed, linear current driving circuit setting pcb board, is surrounded, the half-bridge circuit, rectified current by shielding ring
Road is arranged the right side of pcb board, the left side and the right side and carries out signal transmitting by isolated location, and the shielding ring is at least
The one closed ability of circle.
A kind of LED power supply frequency adjustment method of changeable frequency, including power supply described in above-mentioned any one,
Include the following steps:
S1 it) divided, biased by input voltage of the bias voltage control circuit to AC power supplies, adjusted by controller
The resistance of the resistance R4 of bias voltage control circuit carries out output bias voltage control；
S2 bias voltage) is received, half-bridge circuit is driven by the linear current driving circuit, to adjust control half-bridge electricity
The switch conduction frequency of the cliff on road, control are output to the frequency of rectification circuit；
S3 the tune that the adjustable resistance R8 in linear current driving circuit export linear current value) is controlled by controller
Section, to carry out frequency modulation(PFM) according to the frequency of AC power supplies；
S4) output of half-bridge circuit is carried out direct current electricity output, is supplied LED by SCC circuit output to rectification circuit
Electric control.
Advantageous effects obtained by the present invention are: the present invention can adjust in real time defeated according to the output frequency of power supply
LED frequency is arrived out, prevents the LED frequency of output from mismatching, as one of main improvement of the invention setting voltage bias electricity
Road is adjusted by the driving that electric current driving is biased voltage to match the voltage of AC power supplies, can control the electric current of output.It is logical
It crosses current control frequency matching of the invention to adjust, improves the adaptability of supply LED, stablize supply direct current and supply electricity to LED.
Detailed description of the invention
From following description with reference to the accompanying drawings it will be further appreciated that the present invention.Component in figure is not drawn necessarily to scale,
But it focuses on and shows in the principle of embodiment.In the figure in different views, identical appended drawing reference is specified to be corresponded to
Part.
Fig. 1 is a kind of schematic diagram of the LED power supply of changeable frequency of the invention.
Fig. 2 is a kind of schematic diagram of the LED power supply frequency adjustment method of changeable frequency of the invention.
Specific embodiment
In order to enable the objectives, technical solutions, and advantages of the present invention are more clearly understood, below in conjunction with embodiment, to this
Invention is further elaborated；It should be appreciated that described herein, the specific embodiments are only for explaining the present invention, and does not have to
It is of the invention in limiting.To those skilled in the art, after access is described in detail below, other systems of the present embodiment
System, method and/or feature will become obvious.All such additional systems, method, feature and advantage are intended to be included in
It in this specification, is included within the scope of the invention, and by the protection of the appended claims.In description described in detail below
The other feature of the disclosed embodiments, and these characteristic roots will be apparent according to described in detail below.
Embodiment one:
As shown in Figure 1, for the invention proposes a kind of schematic diagram of the LED power supply of changeable frequency, including controller,
Battery, AC power supplies, bias voltage control circuit, linear current driving circuit, rectification circuit；The battery to the controller and
The linear current drive circuitry, the bias voltage control circuit are connected in parallel on the AC power supplies, export bias voltage
To the linear current driving circuit, after the linear current driving circuit driving half-bridge circuit, to adjust the frequency of out-put supply
Rate is powered by rectification circuit to multiple LED.
The power supply, the battery is rechargeable battery, by charging circuit from the rectification circuit outlet side
It charges.
The power supply, the bias voltage control circuit include resistance R1-R5, capacitor C1-C2, transistor T1-
T2, wherein resistance R4 is potentiometer, carries out current potential adjusting according to the control signal of the controller；One end of the resistance R1 connects
The anode in the AC power supplies is connect, the other end is connected to one end of resistance R2, the negative terminal of the other end connection AC power supplies of resistance R2；
One end of one end connection the resistance R3 and capacitor C1 of resistance R2, the negative terminal of another termination power of capacitor C1, resistance R3's is another
The control terminal of the control terminal of end connection transistor T1 and one of non-controlling end and transistor T2, transistor T1's is another
Non-controlling end connects one end of resistance R5, the negative terminal of another termination power of resistance R5；One end connection transistor of resistance R5
One non-controlling end, one end of another non-controlling end connection resistance R4 of transistor T2, the other end connection capacitor C2's of resistance R4
One end；The current potential of the resistance R4 adjusts control terminal and connects controller, and the control signal for receiving the controller carries out current potential tune
Section.
The power supply, the linear current driving circuit include transistor G1, G2, resistance R5-R8, comparison circuit
U1, wherein the other end of the control terminal connection capacitor C2 of the transistor G1, a non-controlling end of transistor G1 connect battery, separately
One non-controlling end connects one end of resistance R6, the negative terminal of the other end connection power supply of resistance R6；The mono- non-controlling end transistor G2 connects
Battery is connect, one end of another non-controlling end connection resistance R7, one end of the other end connection resistance R8 of resistance R7, resistance R8's is another
One end connects the negative terminal of power supply, and resistance R8 is controllable resistor, and control terminal is connect with the controller；The comparison circuit U1
Two input terminals be separately connected another non-controlling end of the transistor G1 and transistor G2, output end connects the half-bridge circuit
Control terminal；The control terminal of transistor G2 is connected to the output end of half-bridge circuit.
The power supply, the half-bridge circuit include transistor G3, G4, the wherein control of transistor G3 and transistor G4
End processed connects the output end of the comparison circuit U1, the anode of the non-controlling end connection power supply of transistor G3, another non-controlling
One end of end connection transistor G4, the negative terminal of the other end connection power supply of transistor G4；The output of half-bridge circuit is arranged in crystal
Connecting pin between pipe G3 and the G4 of transistor, the control terminal of the transistor G2 be connected to transistor G3 and transistor G4 it
Between connecting pin, by the linear current driving circuit control half-bridge circuit switching frequency so that output frequency is adjustable.
The power supply, including SCC circuit, it is described between the SCC circuit connection half-bridge circuit and rectification circuit
SCC circuit includes capacitor C3, C4, transistor G5；One end of output end connection capacitor C3, C4 of the half-bridge circuit, capacitor C3
The other end connection transistor G5 a non-controlling end, transistor G5 another non-controlling end connection capacitor C4 the other end and
One input terminal of rectification circuit, the anode of power supply are connected to another input terminal of rectification circuit by inductance L1；Rectification circuit is defeated
Outlet shunt capacitance C5.
The power supply, the transistor T1-T2 are triode, and transistor G1-G5 is metal-oxide-semiconductor.
The power supply, the power supply are arranged in PCB circuit board, and the controller, battery, biased electrical are voltage-controlled
The left side of circuit processed, linear current driving circuit setting pcb board, is surrounded, the half-bridge circuit, rectified current by shielding ring
Road is arranged the right side of pcb board, the left side and the right side and carries out signal transmitting by isolated location, and the shielding ring is at least
The one closed ability of circle.
Fig. 2 is a kind of schematic diagram of the LED power supply frequency adjustment method of changeable frequency of the invention, including above-mentioned
Power supply described in meaning one, includes the following steps:
S1 it) divided, biased by input voltage of the bias voltage control circuit to AC power supplies, adjusted by controller
The resistance of the resistance R4 of bias voltage control circuit carries out output bias voltage control；
S2 bias voltage) is received, half-bridge circuit is driven by the linear current driving circuit, to adjust control half-bridge electricity
The switch conduction frequency of the cliff on road, control are output to the frequency of rectification circuit；
S3 the tune that the adjustable resistance R8 in linear current driving circuit export linear current value) is controlled by controller
Section, to carry out frequency modulation(PFM) according to the frequency of AC power supplies；
S4) output of half-bridge circuit is carried out direct current electricity output, is supplied LED by SCC circuit output to rectification circuit
Electric control.
Embodiment two:
A kind of LED power supply of changeable frequency, including controller, battery, AC power supplies, bias voltage control circuit, drive
Dynamic chip, rectification circuit；The battery is powered to the controller and the driving chip, and the bias voltage control circuit is simultaneously
It is associated on the AC power supplies, exports bias voltage to the driving chip, after the driving chip drives half-bridge circuit, to adjust
The frequency of out-put supply is powered by rectification circuit to multiple LED.
The driving chip receives the voltage that bias voltage control circuit biases AC power supplies, as reference voltage, then
According to half-bridge driven is carried out, pwm signal generative circuit is can be used in the driving chip.
The power supply, the battery is rechargeable battery, by charging circuit from the rectification circuit outlet side
It charges.
The power supply, the bias voltage control circuit include resistance R1-R5, capacitor C1-C2, transistor T1-
T2, wherein resistance R4 is potentiometer, carries out current potential adjusting according to the control signal of the controller；One end of the resistance R1 connects
The anode in the AC power supplies is connect, the other end is connected to one end of resistance R2, the negative terminal of the other end connection AC power supplies of resistance R2；
One end of one end connection the resistance R3 and capacitor C1 of resistance R2, the negative terminal of another termination power of capacitor C1, resistance R3's is another
The control terminal of the control terminal of end connection transistor T1 and one of non-controlling end and transistor T2, transistor T1's is another
Non-controlling end connects one end of resistance R5, the negative terminal of another termination power of resistance R5；One end connection transistor of resistance R5
One non-controlling end, one end of another non-controlling end connection resistance R4 of transistor T2, the other end connection capacitor C2's of resistance R4
One end；The current potential of the resistance R4 adjusts control terminal and connects controller, and the control signal for receiving the controller carries out current potential tune
Section.
Other embodiments are identical with one mode of embodiment, do not do detailed statement herein.
Advantageous effects obtained by the present invention are: the present invention can adjust in real time defeated according to the output frequency of power supply
LED frequency is arrived out, prevents the LED frequency of output from mismatching, as one of main improvement of the invention setting voltage bias electricity
Road is adjusted by the driving that electric current driving is biased voltage to match the voltage of AC power supplies, can control the electric current of output.It is logical
It crosses current control frequency matching of the invention to adjust, improves the adaptability of supply LED, stablize supply direct current and supply electricity to LED.
Although describing the present invention by reference to various embodiments above, but it is to be understood that of the invention not departing from
In the case where range, many changes and modifications can be carried out.Therefore, be intended to foregoing detailed description be considered as it is illustrative and
It is unrestricted, and it is to be understood that following following claims (including all equivalents) is intended to limit spirit and model of the invention
It encloses.The above embodiment is interpreted as being merely to illustrate the present invention rather than limit the scope of the invention.It is reading
After the content of record of the invention, technical staff can be made various changes or modifications the present invention, these equivalence changes and
Modification equally falls into the scope of the claims in the present invention.
Claims (9)
1. a kind of LED power supply of changeable frequency, which is characterized in that voltage-controlled including controller, battery, AC power supplies, biased electrical
Circuit processed, linear current driving circuit, rectification circuit；The battery is supplied to the controller and the linear current driving circuit
Electricity, the bias voltage control circuit are connected in parallel on the AC power supplies, export bias voltage to the linear current driving circuit,
After the linear current driving circuit driving half-bridge circuit, to adjust the frequency of out-put supply, multiple LED are given by rectification circuit
Power supply.
2. power supply as described in claim 1, which is characterized in that the battery is rechargeable battery, passes through charging circuit
It charges from the rectification circuit outlet side.
3. power supply as claimed in claim 2, which is characterized in that the bias voltage control circuit include resistance R1-R5,
Capacitor C1-C2, transistor T1-T2, wherein resistance R4 is potentiometer, carries out current potential tune according to the control signal of the controller
Section；One end of the resistance R1 is connected to the anode of the AC power supplies, and the other end is connected to one end of resistance R2, and resistance R2's is another
The negative terminal of one end connection AC power supplies；One end of one end connection the resistance R3 and capacitor C1 of resistance R2, another termination electricity of capacitor C1
The negative terminal in source, the control terminal of the other end connection transistor T1 of resistance R3 and one of non-controlling end and transistor T2's
Control terminal, one end of another non-controlling end connection resistance R5 of transistor T1, the negative terminal of another termination power of resistance R5；Resistance
One non-controlling end of one end connection transistor of R5, one end of another non-controlling end connection resistance R4 of transistor T2, resistance R4
The other end connection capacitor C2 one end；The current potential of the resistance R4 adjusts control terminal and connects controller, receives the controller
Control signal carry out current potential adjusting.
4. power supply as claimed in claim 3, which is characterized in that the linear current driving circuit include transistor G1,
G2, resistance R5-R8, comparison circuit U1, wherein the other end of the control terminal connection capacitor C2 of the transistor G1, transistor G1's
One non-controlling end connects battery, one end of another non-controlling end connection resistance R6, the negative terminal of the other end connection power supply of resistance R6；
The mono- non-controlling end transistor G2 connects battery, one end of another non-controlling end connection resistance R7, and the other end of resistance R7 connects electricity
One end of R8 is hindered, the negative terminal of the other end connection power supply of resistance R8, resistance R8 is controllable resistor, control terminal and the control
Device connection；Two input terminals of the comparison circuit U1 are separately connected another non-controlling end of the transistor G1 and transistor G2,
Output end connects the control terminal of the half-bridge circuit；The control terminal of transistor G2 is connected to the output end of half-bridge circuit.
5. power supply as claimed in claim 4, which is characterized in that the half-bridge circuit includes transistor G3, G4, wherein brilliant
Body pipe G3 connects the output end of the comparison circuit U1 with the control terminal of transistor G4, and a non-controlling end of transistor G3 connects electricity
The anode in source, one end of another non-controlling end connection transistor G4, the negative terminal of the other end connection power supply of transistor G4；Half-bridge electricity
The connecting pin between transistor G3 and the G4 of transistor is arranged in the output on road, and the control terminal of the transistor G2 is connected to crystal
Connecting pin between pipe G3 and the G4 of transistor controls the switching frequency of half-bridge circuit by the linear current driving circuit,
So that output frequency is adjustable.
6. power supply as claimed in claim 5, which is characterized in that including SCC circuit, the SCC circuit connection half-bridge electricity
Between road and rectification circuit, the SCC circuit includes capacitor C3, C4, transistor G5；The output end of the half-bridge circuit connects electricity
Hold one end of C3, C4, a non-controlling end of the other end connection transistor G5 of capacitor C3, another non-controlling end of transistor G5 connects
The other end of capacitor C4 and an input terminal of rectification circuit are connect, the anode of power supply is connected to the another of rectification circuit by inductance L1
One input terminal；Rectification circuit output end shunt capacitance C5.
7. power supply as claimed in claim 5, which is characterized in that the transistor T1-T2 is triode, transistor G1-
G5 is metal-oxide-semiconductor.
8. power supply as described in claim 1, which is characterized in that in the power supply setting PCB circuit board, the control
The left side of device processed, battery, bias voltage control circuit, linear current driving circuit setting pcb board, is enclosed by shielding ring
Around the right side of the half-bridge circuit, rectification circuit setting pcb board, the left side carries out letter by isolated location with the right side
Number transmitting, the shielding ring be at least one to enclose closed ability.
9. a kind of LED power supply frequency adjustment method of changeable frequency, which is characterized in that any including such as claim 1-8
Power supply described in one, includes the following steps:
S1 it) divided, biased by input voltage of the bias voltage control circuit to AC power supplies, adjusted and biased by controller
The resistance of the resistance R4 of voltage control circuit carries out output bias voltage control；
S2 bias voltage) is received, half-bridge circuit is driven by the linear current driving circuit, to adjust control half-bridge circuit
The switch conduction frequency of cliff, control are output to the frequency of rectification circuit；
S3 the adjusting that the adjustable resistance R8 in linear current driving circuit export linear current value) is controlled by controller,
To carry out frequency modulation(PFM) according to the frequency of AC power supplies；
S4) output of half-bridge circuit carries out direct current electricity output, is powered control to LED by SCC circuit output to rectification circuit
System.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811118152.6A CN109257845B (en) | 2018-09-26 | 2018-09-26 | LED power supply with variable frequency and adjusting method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811118152.6A CN109257845B (en) | 2018-09-26 | 2018-09-26 | LED power supply with variable frequency and adjusting method thereof |
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| CN109257845A true CN109257845A (en) | 2019-01-22 |
| CN109257845B CN109257845B (en) | 2020-05-01 |
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| CN109257845B (en) | 2020-05-01 |
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