CN109005621A - LED drive power and its working method, LED lamp - Google Patents
LED drive power and its working method, LED lamp Download PDFInfo
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- CN109005621A CN109005621A CN201810890086.8A CN201810890086A CN109005621A CN 109005621 A CN109005621 A CN 109005621A CN 201810890086 A CN201810890086 A CN 201810890086A CN 109005621 A CN109005621 A CN 109005621A
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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]
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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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Abstract
The invention discloses LED drive powers, including first order translation circuit, M second level translation circuit in parallel；Wherein, the primary of the first order translation circuit flanks alternating current, and secondary side connects M second level translation circuit respectively, alternating current High Level AC Voltage is transformed to the alternating current of low pressure；Each second level translation circuit includes the transformation of switching regulator impedance characteristic and constant-current control circuit, it is in resistive feature by the capacitive eigentransformation of rear class LED load, it is completed at the same time current constant control function, the low-voltage ac signal of input is transformed into the low pressure constant-current dc voltage of 24~120V, output to LED load.The present invention uses completely new topological structure, topological structure is combined using low-frequency power transformation and the transformation of active impedance characteristic and intelligent digital power technology, can solve current LED drive power Surge handling capability it is poor, easily to power grid generation interference, the defects such as poor reliability, the service life is short, operating ambient temperature is low.
Description
Technical field
The present invention relates to field of LED illumination, in particular to LED drive power and its working method, LED lamp, are also related to
To other field of power supplies, such as charger field.
Background technique
With the maturation of LED technology, gradually put instead of fluorescent lamp, gas using LED as the illuminating product of light emitting source
The light emitting sources such as electric light, tengsten lamp.LED illumination product is typically necessary using a power supply (also known as driving power), by AC alternating current
It is transformed to direct current, and various control functions are provided.
Current LED drive power, there are following three kinds of situations:
One, the overwhelming majority takes Switching Power Supply transformation to reach the function of constant current or constant pressure, and this power supply all has booting
Inrush current is big, Harmonics of Input is distorted the interference to power grid such as big, generation higher hamonic wave, while there is also antisurges
Voltage capability is poor (can only generally pass through zero firewire 2KV, 4KV between zero fire and ground wire), the low (matter of most power supplys of reliability
Duration of insurance only had to be equal to or lower than 5 year), the defects such as operating ambient temperature is low.
Two, also some LED drive power uses linear constant current scheme, and it is poor similarly to there is anti surge voltage ability,
The defects such as reliability is low, and operating ambient temperature is low.
Three, it is filtered using Industrial Frequency Transformer as voltage transformation, and increasing rectification below there are also a kind of LED drive power
Wave, but the defects of that there are power factor (PF)s is low, and constant current feature is poor, it is considerably less using the producer of this circuit on the market.
The illuminating products service life such as LED illumination product relative fluorescence lamp, gas discharge will be grown very much.The longevity of LED drive power
Ordering for opposite LED lamp bead is a short slab, so if solving the life problems of LED drive power, it can be easily by LED lamp
Service life extend one times or more.Currently since LED drive power poor reliability, service life are short, lead to have a large amount of lamp every year in this way
Tool, light source need replacing, and especially in some municipal administrations and the illumination of public utilities purposes, need to put into a large amount of update, dimension
Fund is repaired, the public resource of society is occupied, at the same time, also as the replacement of lamps and lanterns produces a large amount of solid electronic rubbish
Rubbish causes the pollution for being almost difficult to reverse to human ecological environment.
Specifically, current LED drive power is generally divided into following several: middle low power, especially less than 75W
Within, using flyback (flyback), PFC+ flyback, the switching power circuit topology of the classics such as bulk；It is high-power in and
LED drive power (70~1000W) also has master generally using active PFC+LLC PFC+ half-bridge/full-bridge circuit topology
Dynamic formula PFC+ flyback, the flyback of active PFC+ normal shock or various modifications.Using the LED drive power of the above topological circuit,
Although can accomplish that small volume, efficiency are higher, EMC, power-on surge current, input harmonic current, in terms of
There are very big limitations.
Therefore, it is necessary to provide the completely new LED drive power of one kind to solve the above problems.
Summary of the invention
The shortcomings that it is a primary object of the present invention to overcome the prior art and deficiency, provide LED drive power, which drives
Dynamic power supply uses completely new topological structure, i.e., using low-frequency power transformation and the transformation of active impedance characteristic and intelligent digital power supply
Technology combines topological structure, can solve current LED drive power Surge handling capability it is poor, easily to power grid generate interference, reliability
Difference, the defects such as the service life is short, operating ambient temperature is low.
Another object of the present invention is to provide LED lamps.
Another object of the present invention is to provide the working method of LED drive power.
The purpose of the present invention is realized by the following technical solution:
LED drive power, including first order translation circuit, M second level translation circuit；Wherein, the M >=1, M the
Two-dimensional transform circuit in parallel；The first order translation circuit is low frequency isolation transformer circuit, the low frequency isolation transformer electricity
Road once flanks alternating current, and secondary side connects M second level translation circuit respectively, and the low frequency isolation transformer circuit is by alternating current height
Pressing convert alternating current is the alternating current of low pressure；Each second level translation circuit includes switching regulator impedance characteristic translation circuit, will after
The capacitive eigentransformation of grade LED load is current constant control function to be completed at the same time, by the low-voltage ac signal of input in resistive feature
The low pressure constant current of 24~120V is transformed into LED load.
The low frequency isolation transformer circuit uses Industrial Frequency Transformer, and the Industrial Frequency Transformer uses skeleton, iron core, insulation
Copper wire winding, the working frequency of the iron core are not higher than 1000HZ, the output AC voltage of the Industrial Frequency Transformer be 12VAC~
48VAC.The setting of output AC voltage meets the requirement of SELV in IEC 61558 (Safety extra low voltage).
Moment be powered since Industrial Frequency Transformer primary side is in inductive impedance feature, so surge current is very low when booting.Due to using
Industrial Frequency Transformer, has the characteristics that barrier to high-frequency signal, on the one hand can eliminate interference of the rear class to power grid, while can also be with
Obstruct the impact of power grid surge and electric fast-pulse to rear class.Due to working in low frequency, and voltage and current is sine, therefore first device
The electric stress of part is lower, and component number is few, and the failure probability of itself is very low, so the reliability of entire power supply is very
It is high.
The primary side of the Industrial Frequency Transformer is provided with fuse, and the fuse is slow-melting fuse or can be from extensive
Multiple fuse.Fuse provides the self-protection ability under abnormal conditions, can be after self-healing fuse provides protection
Self-recovery function.
The second level translation circuit further includes diode D1, D2, high-frequency filter capacitor C1, the switching regulator impedance characteristic
Translation circuit includes inductance L1, control unit M1, HF switch pipe Q1, diode D3, capacitor C2；Wherein diode D1, D2
Anode connects the secondary side of first order translation circuit respectively, and the cathode of diode D1, D2 connect one end of high-frequency filter capacitor C1 respectively；
The cathode of a terminating diode D1 of inductance L1；The both ends of HF switch pipe Q1 are separately connected the other end of inductance L1, high frequency filter
The other end of wave capacitor C1；The anode of diode D3 connects the other end of inductance L1 simultaneously, and the cathode of diode D3 connects load；
The both ends of capacitor C2 are separately connected the cathode of the other end of high-frequency filter capacitor C1, diode D3；Control unit M1 controls high frequency
The turn-on time of switching tube Q1.
Described diode D1, D2 are all made of one of the Schottky diode of low pressure drop, synchronous rectifier.To reduce two
The loss of pole pipe conduction voltage drop.
The LED drive power is high power factor, low surge current, high reliability, low interference type electric main turn
Low-voltage dc power supply, load are other loads of LED load or the design that can charge.
Another object of the present invention is realized by the following technical solution:
LED lamp, including LED drive power further include the LED load connecting with the LED drive power.Common
LED load, such as LED lamp bead.
A further object of the present invention is realized by the following technical solution:
The working method of LED drive power, comprising the following steps:
S1, in booting moment, Industrial Frequency Transformer primary side is in inductive impedance feature, therefore power-on surge current is very low, one
As be lower than 5 times of rated operational current；
Under S2, normal operating conditions, alternating current High Level AC Voltage is transformed to the alternating current of low pressure by first order translation circuit；
S3, low-voltage AC are rectified into full wave voltage, second level transformation by diode D1, D2 of second level translation circuit
The high-frequency filter capacitor C1 of circuit carries out High frequency filter to full wave voltage, is then transmit to the switching regulator resistance of second level translation circuit
Anti- eigentransformation circuit；
S4, switching regulator impedance characteristic translation circuit control unit M1 by acquisition full-bridge voltage phase information, as
The instantaneous reference value of input voltage, the width at time point or conduction pulses that the conducting of control HF switch pipe Q1 starts, so that
The secondary side output current wave of first order translation circuit at approximate sine wave shape all-wave, and it is defeated with first order translation circuit
The holding same-phase of voltage out, that is, the load characteristic of rear class is transformed to it is resistive so that the power frequency of the first order becomes
The load of depressor is purely resistive, and reaching makes the power factor (PF) (PF) of complete machine be greater than 0.9 or more；
The control unit M1 of switching regulator impedance characteristic translation circuit joins with reference to the instantaneous voltage at the both ends high-frequency filter capacitor C1
Examine the condition as switch conduction control；Meanwhile electric current of the control unit M1 also respectively by acquisition HF switch pipe Q1 is instantaneous
The turn-on time of value, the output voltage at bis- end capacitor C2, HF switch pipe Q1, to realize control output loading constant current, output
Load constant pressure, output constant power.
The control unit M1 of the switching regulator impedance characteristic translation circuit, also receives external dimmer interface or communication interface
The dimming commands of sending adjust the electric current for flowing through inductance L1, to reach by controlling the conducting and closing of HF switch pipe Q1
The electric current of successive load is adjusted, realizes dimming function；
The control unit M1 of the switching regulator impedance characteristic translation circuit also detects the electric current for flowing through switching tube Q2 as anti-
Control terminal is presented, the conducting and closing of HF switch pipe Q1 are controlled, to reach accurate constant current output；Pass through control switch pipe Q2
Turn-on time or degree of saturation, completion remove stroboscopic function, pass through the conducting and closing of control switch pipe Q2, realize adjust load
The function of electric current, to reach the function of light modulation.
The HF switch pipe Q1 is using high-speed switch, the MOSFET of low on-resistance；Diode D3 uses recovery time
Diode or synchronous rectifier short, forward voltage drop is low；Inductance L1 uses low-loss FERRITE CORE high frequency transformer/electricity
Sense or high frequency amorphous magnetic core transformer/inductance；Capacitor C2 uses the electrolytic capacitor or high temperature, height of high temperature large ripple current
The solid electrolyte capacitor of capacitance meets the requirement of reliability under high temperature, low ripple current；Switching tube Q2 is MOSFET or double
Polarity triode can be used as independent overcurrent, short-circuit protection.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1, service life and reliable sexual clorminance: using the LED drive power of this topological structure, the service life can be more than 10 years, and 20 years, very
To up to 30 years or more；Mean free error time can reach 10,000,000 hours or more or even longer.
2, operating ambient temperature advantage:, can be in 100 degrees Celsius or more of ring using the LED drive power of this topological structure
It works normally in border, can notably be worked normally in 120 degrees Celsius of environment.
3, input surge (Inrush current) inhibits advantage: using the LED drive power of this topological structure, energy will be defeated
Enter Inrush current restraining within 2 times of running currents, and the surge current that mainstream LED drives on Vehicles Collected from Market up to counts
Ten, hundreds of amperes or even hundreds of amperes.
4, antisurge advantage: using the LED drive power of this topological structure, zero firewire surge voltage of input will can be improved
To 8kV, even as high as 10KV.
5, odds for effectiveness: using the LED drive power of this topological structure, overall efficiency reaches as high as 95%, general reachable
To 90% or more.
6, it controls advantage: using the LED drive power of this topological structure, very convenient can expand all kinds of intelligent control function
Energy.
7, second level translation circuit of the invention keeps load current proportional to the phase of alternating current and instantaneous value, forms one
Active PFC revising load feature, so that the power factor (PF) of integral LED driving power be made to be greater than 0.95 or more, harmonic distortion is small
In 10%.Since rear class is low-voltage direct, therefore it can facilitate by increasing intelligent control module and realize various intelligent control function
Can, or all kinds of intelligent illuminating systems of composition.
Detailed description of the invention
Fig. 1 is the general frame figure of LED drive power of the present invention.
Fig. 2 is the circuit diagram of LED drive power of the present invention.
Specific embodiment
Present invention will now be described in further detail with reference to the embodiments and the accompanying drawings, but embodiments of the present invention are unlimited
In this.
Realization approach such as Fig. 1,2, LED drive power is as follows:
(1) entire topology is divided into second level, such as Fig. 1.
Wherein, first order translation circuit uses Industrial Frequency Transformer, and alternating current high-voltage alternating is transformed to the alternating current of low pressure, the
Generally 12VAC~48VAC of the output AC voltage of level-one, to meet (the Safety extra low of SELV in IEC 61558
Voltage requirement).Generally, a fuse or self recovery can also be increased in the primary side of Industrial Frequency Transformer
Fuse provides the self-protection ability under abnormal conditions.
Industrial Frequency Transformer used by the same level, in booting moment, the primary side of Industrial Frequency Transformer is in inductive impedance feature, therefore
Power-on surge current is very low, generally below 5 times of rated operational current.
Industrial Frequency Transformer used by the same level, since the working frequency of its iron core is generally not more than 1000HZ, high-frequency signal
Secondary side can not be coupled to by primary side, primary side can not be also coupled to from secondary side, therefore rear class can be reduced to power grid
Conduction Interference can also obstruct the impact of surge voltage on power grid, electric current to rear class.
Industrial Frequency Transformer used by the same level, due to using skeleton, iron core, insulated copper wire coiling, these three materials are most
High-temperature can be 150 degrees Celsius, it might even be possible to up to 180 degrees Celsius.And the probability of failure is very low, is easy to reach overlength
Service life, as the service life can be greater than 80000 hours, 100000 hours or even 200000 hours.There is extremely low failure simultaneously
Probability, if its mean free error time (MTBF) can be greater than 5,000,000 hours, even more than 10,000,000 hours or higher,
Industrial Frequency Transformer used by the same level, using low-loss iron core and the enameled wire of high conductivity, conversion efficiency
Generally 90~95%, reach as high as 98% transfer efficiency.
(2) second level translation circuit is load eigentransformation, current constant control, light modulation, communication control section.Due to LED work
Make under direct current supply.Circuit Fault on Secondary Transformer is directly connected to low frequency filtering capacitor, it will is in capacitive load feature.Second level circuit
By impedance characteristic varying circuit, make the load of Industrial Frequency Transformer in resistive feature.At the same time, the same level circuit also completes LED
The function of current constant control, if it is desired, dimming control function, intelligent control and communication control can also be increased in the same level circuit
The functions such as system.
(3) such as Fig. 2, second level translation circuit preferentially use switching regulator impedance characteristic translation circuit.The first order inputs low pressure
AC signal is rectified to become full-wave direct current voltage, send to switching regulator impedance characteristic translation circuit, exports 24~120V direct current.
On the one hand the switching regulator impedance characteristic translation circuit is completed voltage being higher than the first order at voltage from the DC voltage conversion of all-wave
The peak value of output voltage.On the other hand, by the turn-on frequency of control switch or pulse width, so that the output electric current of the first order
For the sine wave of low frequency, and phase first order output voltage keeps identical, be equivalent to the load characteristic of rear class is transformed to it is resistive,
So that the load of the Industrial Frequency Transformer of the first order is purely resistive, reaching makes the power factor (PF) (PF) of complete machine be greater than 0.9 or more, highest
It can be to 0.99 or more.
(4) the wherein switching regulator impedance characteristic translation circuit of the second level can be using dedicated PFC Corrective control IC,
It is also possible to be made of together single-chip microcontroller using dedicated algorithm and driving circuit；
(5) the wherein switching regulator impedance characteristic translation circuit of the second level is converted into DC voltage completing full-wave electric current, will
While capacitive load or other kinds of load transfer are resistive characteristic load, the current constant control of load can also be completed, or
Person's brightness adjustment control, or by communication control circuit, communicated with outside, complete other intelligent control functions.
Topology theory of the invention, detailed description are as follows:
1, Fig. 2 is a typical application circuit figure using present invention topology.
2,220V alternating current transports to first order circuit, and mains AC is input to Industrial Frequency Transformer T1, and Industrial Frequency Transformer T1 is adopted
With no-load loss is low, Industrial Frequency Transformer of high reliability, especially toroidal transformer.The transformer converts alternating current high-voltage alternating
For the alternating current of low pressure, export as low-voltage AC piezoelectricity.Its output voltage range is usually 12VAC~48VAC, to meet
The requirement of SELV (Safety extra low voltage) in IEC 61558.Generally, defeated in the primary side of Industrial Frequency Transformer
Entering connection one fuse S1, fuse S1 between end and alternating current can be the fuse of slow-melting fuse or self recovery,
Protection in abnormal cases is provided, or the self-recovery function after protection is provided.
Industrial Frequency Transformer T1, the moment that is powered, booting was maximum since the primary side of the transformer is in inductive impedance feature
Surge current is generally below 2 times of running current, even lower.Since the working frequency of its iron core is generally not more than
1000HZ, high-frequency signal can not be coupled to secondary side by primary side, obstruct surge voltage, electric current on power grid and rush to rear class
It hits, it is even higher that Anti-surging ability can achieve 8KV between LN；High-frequency interferencing signal also can not be coupled to one from secondary side simultaneously
Secondary side, therefore rear class can be reduced to the Conduction Interference of power grid.
Due to using skeleton, iron core, insulated copper wire coiling, the maximum temperature of these three materials can be Industrial Frequency Transformer T1
150 degrees Celsius, it might even be possible to up to 180 degrees Celsius or more.And the probability of failure is very low, is easy to reach the use longevity of overlength
Life.It is greater than 100000 hours or even 200000 hours using projected life.Its coiling mature production technology, therefore produce in batches
Product have extremely low failure probability, as its mean free error time can be greater than 5,000,000 hours or even 10,000,000 hours or
Person is higher.
Industrial Frequency Transformer T1 uses low-loss iron core, such as silicon steel sheet or low-loss amorphous alloy.Its conversion efficiency
Generally 90~95%, reach as high as 98% or more transfer efficiency.
3, the secondary side output of Industrial Frequency Transformer T1, is connected to the input terminal of second level translation circuit, through diode D1, D2
It is rectified into full wave voltage, diode D1, D2 are managed using the Schottky diode of low pressure drop or the MOSFET of synchronous rectification,
To reduce the loss of diode conduction voltage drop.Rectified later full wave voltage is sent to high-frequency filter capacitor C1, High frequency filter electricity
Hold the general 0.1~0.47uF of capacitance of C1, perhaps it can be one or several high frequency capacitances composition lower than 1uF.Through high frequency
Later full wave voltage is filtered, is sent to by inductance L1, control unit M1, HF switch pipe Q1, diode D3, capacitor C2 composition
Impedance characteristic transformation, current constant control, brightness adjustment control, abnormal protection control circuit module second level circuit.Second level transformation electricity
Road can be typical switching regulator impedance characteristic translation circuit (boost).But its feedback can be multiple voltages, electric current letter
Number.Control unit M1 controls HF switch as the instantaneous reference value of input voltage by the phase information of acquisition full-bridge voltage
The width at time point or conduction pulses that the conducting of pipe Q1 starts, so that Industrial Frequency Transformer T1 secondary side output current wave is at close
Like the all-wave of sine wave shape, and the holding same-phase with Industrial Frequency Transformer T1 output voltage, it is equivalent to the load of rear class is special
Sign be transformed to it is resistive so that the load of the Industrial Frequency Transformer of the first order be purely resistive, reach the power factor (PF) for making complete machine
(PF) it is greater than 0.9 or more, ranges up to 0.99 or more.Inductance L1, control unit M1, HF switch pipe Q1, diode D3, capacitor
C2 constitutes typical boost switching (boost) circuit, and control unit M1 refers to the instantaneous electricity at the both ends high-frequency filter capacitor C1
The condition that pressure reference is controlled as switch conduction, meanwhile, control unit M1 also acquires instantaneous by the electric current of HF switch pipe Q1
Value and the output voltage with bis- end second level translation circuit of content C2, by controlling the turn-on time of HF switch pipe Q1, thus
Achieve the effect that output loading constant current, output loading constant pressure, output constant power.Control unit M1 can also receive external tune simultaneously
The dimming commands that optical interface or communication interface issue, by controlling the conducting and closing of HF switch pipe Q1, adjusting flows through electricity
The electric current of L1 is felt, to reach the electric current for adjusting successive load, realize dimming function or open a function.Control unit M1 may be used also
To detect the electric current for flowing through switching tube Q2 as feedback control end, the conducting and closing of HF switch pipe Q1 are controlled, to reach
Accurate constant current output.Wherein, HF switch pipe Q1 is using high-speed switch, the MOSFET of low on-resistance；Diode D3 is used
Recovery time is short, forward voltage drop low diode or synchronous rectifier；Inductance L1 uses low-loss FERRITE CORE high frequency
Transformer/inductance or high frequency amorphous magnetic core transformer/inductance；Capacitor C2 uses the electrolytic capacitor of high temperature large ripple current, or
It is high temperature, the solid state electrolysis of high capacitance meets the requirement of reliability under high temperature, low ripple current；Switching tube Q2 is MOSFET
Or bipolarity triode, it can be used as independent overcurrent, short-circuit protection, the turn-on time of control switch pipe Q2 can also be passed through
Or stroboscopic function is removed in degree of saturation, completion.It can also realize by control switch pipe Q2 conducting and closing and adjust load current
Function, to reach the function of light modulation.
4, second level translation circuit exports connected load, can be the series-parallel load of LED lamp bead, is also possible to it
He loads, such as high-power charger.
5, wherein first order Industrial Frequency Transformer circuit can connect a load characteristic transformation, current constant control, light modulation communication
Control circuit module.It is also possible to multiple load characteristic transformation, current constant control, light modulation, communication control circuit module identical function
Or the second level circuit in parallel of similar functions, multiple second level circuits in parallel may be implemented to increase output electric current, output power,
Or realize the functions such as multichannel loading exports, and multichannel loading can be controlled separately.
Key modules and technology of the invention are as follows:
1, high-power LED driving power source topological structure in two-dimensional transform:
Using two-dimensional transform framework: the first order realizes electrical isolation and high-frequency interferencing signal by using Industrial Frequency Transformer
Barrier.The second level uses impedance characteristic varying circuit, successive load is transformed to purely resistive load, and realize constant current, electric current
The functions such as adjusting, switch, intelligent control.
2, load change and constant current, light modulation, multiple protective one control technology:
Load change and constant current, light modulation, multiple protective one controlling technical method: by magnitude voltage signals before acquiring,
By the electric current of main switching device, output voltage, output four signals of electric current it is one or several, while according to dimming interface,
The requirement of external dimmer, intelligent control signal or instruction is switched by controlling typical boost switching route (Boost) major loop
The switch for being associated in load circuit is managed or worn, is realized to the eigentransformation of successive load, output constant current, output constant pressure, electric current tune
The control such as section.
3, the second level is in parallel, proposes High Output Current, or the method for realizing multiple-channel output:
First order Industrial Frequency Transformer circuit can connect multiple load characteristic transformation, current constant control, light modulation, communication control electricity
The second level circuit in parallel of the same or like function of road module, multiple second level circuits in parallel may be implemented to increase output electricity
Stream, output power, or realize the functions such as multichannel loading exports, and multichannel loading can be controlled separately.
Main creation point of the invention is as follows:
1, secondary circuit topological circuit, the first order use Industrial Frequency Transformer, the second level using load characteristic, current constant control,
The control circuit that brightness adjustment control combines realizes high temperature, low surge current, high impact resistance surge, high reliability, efficient
LED drive power circuit design method；
2, using the LED drive power of the above topological circuit；
3, load change and constant current, light modulation, multiple protective one controlling technical method: pass through step voltage letter before acquiring
Number, by the electric current of main switching device, output voltage, output four signals of electric current it is one or several, while being connect according to light modulation
Mouth, external dimmer, intelligent control signal or the requirement of instruction, by controlling typical boost switching route (Boost) major loop
Switching tube wears the switch for being associated in load circuit, realizes to the eigentransformation of successive load, output constant current, output constant pressure, electricity
The controls such as stream adjusting；
4, the control circuit that the second level is combined using load characteristic, current constant control, brightness adjustment control, using one of them or
The several functions of person are combined；
5, the second level is in parallel, to propose High Output Current, or the method for realizing multiple-channel output: first order Industrial Frequency Transformer electricity
Road can connect multiple load characteristic transformation, current constant control, light modulation, the same or like function of communication control circuit module second
Grade circuit in parallel, multiple second level circuits in parallel may be implemented to increase output electric current, output power, or realize multichannel loading
Output, multichannel loading such as can be controlled separately at the functions.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (10)
1.LED driving power, it is characterised in that: including first order translation circuit, M second level translation circuit；Wherein, the M
>=1, M second level translation circuits are in parallel；The first order translation circuit is low frequency isolation transformer circuit, the low frequency isolation
Transformer circuit once flanks alternating current, and secondary side connects M second level translation circuit, the low frequency isolation transformer circuit respectively
Alternating current High Level AC Voltage is transformed to the alternating current of low pressure；Each second level translation circuit includes switching regulator impedance characteristic transformation electricity
The capacitive eigentransformation of rear class LED load is current constant control function to be completed at the same time, by the low pressure of input in resistive feature by road
AC signal is transformed into the low pressure constant-current dc voltage of 24~120V, output to LED load.
2. LED drive power according to claim 1, it is characterised in that: the low frequency isolation transformer circuit uses power frequency
Transformer, the Industrial Frequency Transformer use skeleton, iron core, insulated copper wire coiling, and the working frequency of the iron core is not higher than
1000HZ, the output AC voltage of the Industrial Frequency Transformer are 12VAC~48VAC.
3. LED drive power according to claim 2, it is characterised in that: the primary side of the Industrial Frequency Transformer is provided with guarantor
Dangerous silk, the fuse are slow-melting fuse or being capable of self-healing fuses.
4. LED drive power according to claim 1, it is characterised in that: the second level translation circuit further includes diode
D1, D2, high-frequency filter capacitor C1, the switching regulator impedance characteristic translation circuit include inductance L1, control unit M1, HF switch
Pipe Q1, diode D3, capacitor C2；Wherein the anode of diode D1, D2 connects the secondary side of first order translation circuit, diode respectively
The cathode of D1, D2 connect one end of high-frequency filter capacitor C1 respectively；The cathode of a terminating diode D1 of inductance L1；HF switch pipe
The both ends of Q1 are separately connected the other end of the other end of inductance L1, high-frequency filter capacitor C1；The anode of diode D3 connects simultaneously
The cathode of the other end of inductance L1, diode D3 connects load；The both ends of capacitor C2 are separately connected the another of high-frequency filter capacitor C1
One end, diode D3 cathode；The turn-on time of control unit M1 control HF switch pipe Q1.
5. LED drive power according to claim 4, it is characterised in that: described diode D1, D2 are all made of Xiao of low pressure drop
One of special based diode, synchronous rectifier.
6. according to claim 1 to LED drive power described in 5 any claims, it is characterised in that: its for high power factor,
Low surge current, high reliability, low interference type electric main turn low-voltage dc power supply, and load is LED load or other are negative
It carries.
7.LED lamps and lanterns, including LED drive power described in claim 1 to 5 any claim further include driving with the LED
The LED load of power supply connection.
The working method of 8.LED driving power, which comprises the following steps:
S1, in booting moment, since Industrial Frequency Transformer primary side is in inductive impedance feature, therefore power-on surge current is very low；
Under S2, normal operating conditions, alternating current High Level AC Voltage is transformed to the alternating current of low pressure by first order translation circuit；
S3, low-voltage AC are rectified into full wave voltage, second level translation circuit by diode D1, D2 of second level translation circuit
High-frequency filter capacitor C1 High frequency filter is carried out to full wave voltage, the switching regulator impedance for being then transmit to second level translation circuit is special
Levy translation circuit；
S4, switching regulator impedance characteristic translation circuit control unit M1 by acquisition full-bridge voltage phase information, as input
The instantaneous reference value of voltage, the width at time point or conduction pulses that the conducting of control HF switch pipe Q1 starts, so that first
Grade translation circuit secondary side output current wave at approximate sine wave shape all-wave, and with first order translation circuit export electricity
The holding same-phase of pressure, that is, the load characteristic of rear class is transformed to it is resistive so that the Industrial Frequency Transformer of the first order
Load be purely resistive, reach make complete machine power factor (PF) be greater than 0.9 or more；
The control unit M1 of switching regulator impedance characteristic translation circuit makees with reference to the instantaneous voltage reference at the both ends high-frequency filter capacitor C1
For the condition of switch conduction control；Meanwhile control unit M1 also passes through current instantaneous value, the electricity of acquisition HF switch pipe Q1 respectively
Hold the output voltage at bis- end C2, the turn-on time of HF switch pipe Q1, to realize that control output loading constant current, output loading are permanent
Pressure, output constant power.
9. the working method of LED drive power according to claim 8, which is characterized in that the switching regulator impedance characteristic becomes
The control unit M1 for changing circuit also receives the dimming commands that external dimmer interface or communication interface issue, by controlling high frequency
The conducting and closing of switching tube Q1 adjusts the electric current for flowing through inductance L1, to reach the electric current for adjusting successive load, realizes light modulation
Function；
The control unit M1 of the switching regulator impedance characteristic translation circuit also detects the electric current for flowing through switching tube Q2 as feedback control
End processed controls the conducting and closing of HF switch pipe Q1；By the turn-on time or degree of saturation of control switch pipe Q2, complete
Stroboscopic function realizes the function of adjusting load current, to reach the function of light modulation by the conducting and closing of control switch pipe Q2
Energy.
10. the working method of LED drive power according to claim 8, which is characterized in that the HF switch pipe Q1 is used
The MOSFET of high-speed switch, low on-resistance；Diode D3 is using the diode or synchronization that recovery time is short, forward voltage drop is low
Rectifying tube；Inductance L1 uses low-loss FERRITE CORE high frequency transformer/inductance or high frequency amorphous magnetic core transformer/inductance；
Capacitor C2 is using the electrolytic capacitor of high temperature large ripple current or the solid electrolyte capacitor of high temperature, high capacitance；Switching tube Q2 is
MOSFET or bipolarity triode.
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| CN201810890086.8A CN109005621A (en) | 2018-08-07 | 2018-08-07 | LED drive power and its working method, LED lamp |
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| CN201810890086.8A CN109005621A (en) | 2018-08-07 | 2018-08-07 | LED drive power and its working method, LED lamp |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112821766A (en) * | 2019-11-18 | 2021-05-18 | 擎力科技股份有限公司 | Driving method and driving device thereof |
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Application publication date: 20181214 |