CN104602390B - The LED lamp drive circuit of double winding single-stage primary side feedback - Google Patents
The LED lamp drive circuit of double winding single-stage primary side feedback Download PDFInfo
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- CN104602390B CN104602390B CN201410015623.6A CN201410015623A CN104602390B CN 104602390 B CN104602390 B CN 104602390B CN 201410015623 A CN201410015623 A CN 201410015623A CN 104602390 B CN104602390 B CN 104602390B
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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
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The present invention provides a kind of LED lamp drive circuit of double winding single-stage primary side feedback, uses the LED drive chip of source drive technology, and detect erasing time Tons indirectly by the parasitic capacitance of external first power tube source-drain electrode（I.e. secondary side turn-on time）；Very high power factor (PF) is also realized by the control method of fixed primary side turn-on time Tonp, alleviates power grid pressure；By the correlation technology of secondary side turn-on time and primary current peak value, the open-circuit-protection of output LED is realized；In addition, since LED drive chip has extremely low operating current, it can directly be powered by line voltage by first resistor, to which the required auxiliary winding for being detected to LED drive chip power supply and erasing time, output voltage of existing primary side feedback LED drive circuit be omitted, transformer only needs primary side winding and vice-side winding, the manufacturing process flow for simplifying transformer, further reduces costs.
Description
Technical field
The present invention relates to a kind of drivings of the LED light of switch power technology field more particularly to double winding single-stage primary side feedback
Circuit.
Background technology
As people are to environmentally friendly, energy saving, efficient requirement, LED illumination is advanced by leaps and bounds recent years, realizes great-leap-forward
Development.In order to alleviate power grid pressure, and cost is reduced, the primary side feedback (PSR) with single stage power factor correction (PFC)
LED drive chip was begun to appear in the market in nearest 2 years.
Referring to Fig. 1, it is the primary side feedback LED drive circuit of existing single stage power factor correction, the primary side feedback
LED drive circuit includes：Control chip 400, transformer 413, power tube Q100, rectifier bridge 401, line voltage detecting resistance R101
With R102, high-voltage capacitance C101, auxiliary side rectifier diode D101 and divider resistance R103 and R104, filter capacitor C102, defeated
Outlet rectifier diode D102, output capacitance C103 and LED light string 416.The transformer 413 includes primary side winding Np, auxiliary
Winding Na and secondary windings Ns.The wherein auxiliary winding Na of transformer 413 for indirectly detect pair side turn-on time Tons with
Secondary side output voltage Vout controls for use in system and exports LED open-circuit-protections；Resistance 403 and 404 structures are detected by line voltage
At line voltage circuit for detecting input control chip 400 mult pins, for according to big minor adjustment each period of line voltage
Primary current peak value, line voltage is higher, and primary current peak value is bigger, to realize high power factor (PF).Due to needing line voltage
Circuit for detecting and transformer three windings of needs, complex manufacturing technology, cost are higher.
Therefore, the prior art is defective, needs to improve.
Invention content
The technical problem to be solved by the present invention is to：A kind of LED lamp drive circuit of double winding single-stage primary side feedback is provided,
It needs line voltage circuit for detecting and transformer to need three windings to solve LED lamp drive circuit in the prior art, makes work
Skill is complicated, the higher problem of cost.
Technical scheme is as follows：The present invention provides a kind of LED lamp drive circuit of double winding single-stage primary side feedback,
Including：AC input, the first rectification filtering module, absorption circuit, transformer, the second rectification filtering module, LED light access
End, the first power tube, LED drive chip, first resistor, second resistance, the first capacitance and the second capacitance, the LED drivings
Chip has the first to the 5th pin, and the input terminal of first rectification filtering module connect with AC input, and described the
It is defeated with one end of first resistor, the input terminal of absorption circuit and transformer respectively that pin is rectified in the output of one rectification filtering module
The first end for entering end is electrically connected, the other end of the first resistor respectively with one end of the first capacitance, the first pin and first
The grid of power tube is electrically connected, the drain electrode of first power tube respectively with the output end of absorption circuit, transformer inputs
Second end and the 5th pin be electrically connected, the first end of the transformer output end is defeated with second rectification filtering module
Enter proper pin to be electrically connected, the output of second rectification filtering module is rectified pin and is electrically connected with LED light incoming end, institute
The one end and the 4th pin for stating second resistance are electrically connected, and one end and the third pin of second capacitance are electrically connected, described
The output end of first rectification filtering module bears pin, second pin, the other end of the first capacitance, the other end of the second capacitance, the
The output end of the other end of two resistance, the second end of transformer output end and the second rectification filtering module bears pin and ground wire
It is electrically connected；
The LED drive chip includes：Line voltage compensation module, sampling and keep module, current constant control and output open circuit are protected
Protect module, error amplifier, clamper module, PWM comparators, logical AND drive module, erasing time detecting module, maximum shutdown
Time module, overvoltage/under-voltage module, saw-toothed wave generator, built-in power module and the second power tube, the error amplifier
With the first in-phase input end, the first inverting input and the first output end, the PWM comparators have the second homophase input
End, the second inverting input and second output terminal, first pin input terminal, the built-in electricity with overvoltage/under-voltage module respectively
The input terminal of source module is electrically connected, the output end of the overvoltage/under-voltage module respectively with the input terminal of logical AND drive module,
The input terminal of built-in power module is electrically connected, the input terminal of the logical AND drive module also respectively with maximum turn-off time mould
The output end of block, the output end of erasing time detecting module, the second output terminal of PWM comparators and current constant control and output are opened
The output end of road protection module is electrically connected, the grid of the output end of the logical AND drive module and the second power tube Q2
Be electrically connected, the third pin respectively with the output end of clamper module, the first output end of error amplifier and PWM comparators
The second inverting input be electrically connected, the second in-phase input end of the PWM comparators is defeated with the saw-toothed wave generator
Outlet is electrically connected, and the 4th pin is electrically connected with the source electrode of the input terminal of sampling and keep module, the second power tube respectively,
5th pin is electrically connected with the drain electrode of the input terminal of erasing time detecting module, the second power tube respectively, the sampling
The input terminal of module is kept also to be electrically connected with line voltage compensation module, the output end and current constant control of the sampling and keep module
Be electrically connected with the input terminal of output open circuit protection module, the output end of the current constant control and output open circuit protection module also with
First inverting input of error amplifier, the input terminal of the current constant control and output open circuit protection module also respectively with demagnetization
The grid of the output end of time detecting module and the second power tube is electrically connected, the first in-phase input end of the error amplifier
It is electrically connected with the output end of the built-in power module.
The transformer includes primary side and secondary side.
First rectification filtering module includes rectifier bridge and the third capacitance that is connected in parallel with the output end of rectifier bridge, institute
It includes the first diode and the 4th capacitance that is connect with the first Diode series to state the second rectification filtering module, the one or two pole
The secondary side of the anode of pipe and the transformer is electrically connected, the cathode of first diode respectively with the 4th capacitance one
End, LED light incoming end are electrically connected, and the other end of the 4th capacitance is for connecting ground wire.
The absorption circuit includes：3rd resistor, the 5th capacitance and the second diode, described 3rd resistor one end respectively with
The output of first rectification filtering module rectify pin, one end of first resistor, one end of the 5th capacitance and transformer primary side the
One end is electrically connected, and the other end of the 3rd resistor is electrical with the other end of the 5th capacitance, the cathode of the second diode respectively
The anode of connection, second diode is electrically connected with the second end of the drain electrode of the first power tube, transformer primary side respectively.
The erasing time detecting module includes clamp diode, first voltage comparator and latching logic module, described
First voltage comparator has third in-phase input end, third inverting input and third output end, the clamp diode
Anode is connect with the 5th pin, the source electrode of the first power tube and third in-phase input end respectively, the cathode of the clamp diode
It is electrically connected respectively with the first pin, third inverting input, the third output end electrically connects with the latching logic module
It connects, the latching logic module is also electrical with the logical AND drive module, current constant control and output open circuit protection module respectively
Connection.
The current constant control includes with output open circuit protection module：Unity gain buffer, first to fourth switch, the 4th
Resistance, the 6th capacitance, the 7th capacitance, the first phase inverter, the second phase inverter, second voltage comparator, current source and three input or
NOT gate, the second voltage comparator have the 4th in-phase input end, the 4th inverting input and the 4th output end, the unit
Gain buffer has the 5th in-phase input end, the 5th inverting input and the 5th output end, the 5th in-phase input end point
It is not electrically connected with the 4th inverting input, sampling and keep module, the 5th inverting input electrically connects with the 5th output end
It connects, the 5th output end is also electrically connected with the first end of first switch, the control terminal of the first switch and erasing time
Output end connection in detecting module for providing the erasing time, the second end of the first switch respectively with the 4th resistance one
End, second switch second end be electrically connected, the other end of the 4th resistance respectively with logical AND drive module, the 6th capacitance
One end be electrically connected, the other end of the 6th capacitance is electrically connected with ground wire, the control terminal of the second switch and first
The output end of phase inverter connects, and first end and the ground wire of the second switch are electrically connected, the input terminal of first phase inverter
With the erasing time detecting module be electrically connected, the 4th in-phase input end respectively with third switch first end, the 7th
One end of capacitance, the 4th switch second end be electrically connected, the other end of the 7th capacitance is electrically connected with ground wire, described the
The control terminal of three switches is electrically connected with the output end of the second phase inverter, and the second end of the third switch is connect with current source,
The control terminal of 4th switch is electrically connected with the input terminal of the grid of the second power tube, the second phase inverter respectively, and described the
The first end of four switches is electrically connected with ground wire, and the 4th output end inputs nor gates with logical AND drive module, three respectively
First input end be electrically connected, it is described three input nor gate the second input terminal and erasing time detecting module output end,
It is described three input nor gate third input terminals connect with the grid of the second power tube, it is described three input nor gate output end and
The input terminal of logical AND drive module is electrically connected.
Using the above scheme, the LED lamp drive circuit of double winding single-stage primary side feedback of the invention, uses source drive
The LED drive chip of technology, and erasing time Tons is detected by the parasitic capacitance of external first power tube source-drain electrode indirectly
(i.e. secondary side turn-on time)；Very high power factor (PF) is also realized by the control method of fixed primary side turn-on time Tonp, is delayed
Solve power grid pressure；By the correlation technology of secondary side turn-on time and primary current peak value, the open-circuit-protection of output LED is realized；
Further, since LED drive chip has extremely low operating current, can directly be powered by line voltage by first resistor, to save
It is required for being detectd existing primary side feedback LED drive circuit to LED drive chip power supply and erasing time, output voltage has been omited
The auxiliary winding of survey, transformer only need primary side winding and vice-side winding, simplify the manufacturing process flow of transformer, further
Reduce cost.
Description of the drawings
Fig. 1 is the circuit diagram of existing primary side feedback LED drive circuit.
Fig. 2 is the circuit diagram of the LED lamp drive circuit of double winding single-stage primary side feedback of the present invention.
Fig. 3 is the internal frame diagram of LED drive chip in the present invention.
Fig. 4 is the physical circuit and its connection relationship diagram of erasing time detecting module in the present invention.
Fig. 5 is the oscillogram of important node in Fig. 4.
Fig. 6 is the circuit diagram of current constant control and output open circuit protection module in the present invention.
Specific implementation mode
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Referring to Fig. 2, the present invention provides a kind of LED lamp drive circuits of double winding single-stage primary side feedback, including：Exchange
Electrical input 12, the first rectification filtering module 14, absorption circuit 16, transformer 18, the second rectification filtering module 19, LED light connect
Enter end 17, the first power tube Q1, LED drive chip 22, first resistor R1, second resistance R2, the electricity of the first capacitance C1 and second
Hold C2, the LED drive chip 22 have the first to the 5th pin 1,2,3,4,5 (vcc, gnd, comp, cs, S), described first
The input terminal of rectification filtering module 14 is connect with AC input 12, and the output of first rectification filtering module 14, which is rectified, draws
Foot is electrically connected with the first end of 18 input terminal of one end of first resistor R1, the input terminal of absorption circuit 16 and transformer respectively,
The other end of the first resistor R1 respectively with one end of the first capacitance C1, the grid g1 of the first pin 1 and the first power tube Q1
Be electrically connected, the drain electrode d1 of the first power tube Q1 respectively with the output end of absorption circuit 16,18 input terminal of transformer the
Two ends and the 5th pin 5 are electrically connected, the first end of 18 output end of the transformer and second rectification filtering module 19
Input is rectified pin and is electrically connected, and pin is rectified in the output of second rectification filtering module 19 and LED light incoming end 17 is electrical
Connection, one end and the 4th pin 4 of the second resistance R2 are electrically connected, one end and the third pin 3 of the second capacitance C2
It is electrically connected, the output end of first rectification filtering module 14 bears pin, second pin 2, the other end of the first capacitance C1, the
The other end of two capacitance C2, the other end of second resistance R2, the second end of 18 output end of transformer and the second rectifying and wave-filtering mould
The output end of block 19 is born pin and is electrically connected with ground wire.The transformer 18 includes primary side Np and pair side Ns, the pair side Ns
For giving LED light 20 to power.
Wherein, the LED drive chip 22 is directly powered by line voltage Vin by first resistor R1, since LED drives core
22 operating current of piece is low, can ignore it and be affected to efficiency；Pass through the parasitic capacitance of the first power tube Q1 source-drain electrodes simultaneously
Cds detects the erasing time indirectly, and the combinations of above two technologies allows the LED lamp drive circuit to save the auxiliary of transformer
Winding and its circuit connected；In addition by fixed primary side Np turn-on time Tonp technologies, which stablizes work
Each period primary side Np turn-on time is the same after work, and such line voltage Vin is higher, primary side peak point current Ipp=(Vin/Lp) *
Tonp is higher, to realize very high power factor (PF), wherein Lp is transformer primary side sensibility reciprocal.This control mode makes
Line voltage circuit for detecting can be omitted, moreover it is possible to avoid line voltage Vin detectings and the distortion in processing procedure, primary side peak point current
It is directly directly proportional to line voltage Vin, realize higher power factor (PF) (PF values) and smaller total harmonic distortion (THD).
Referring to Fig. 3, the LED drive chip 22 includes：Line voltage compensation module 31, sampling and keep module 32, constant current
Control and output open circuit protection module 33, error amplifier 34, clamper module 35, PWM comparators 36, logical AND drive module
37, erasing time detecting module 38, maximum turn-off time module 39, overvoltage/under-voltage module 41, saw-toothed wave generator 42, built-in
Power module 43 and the second power tube Q2, the error amplifier 34 have the first in-phase input end+, the first anti-phase input
End-and the first output end, the PWM comparators 36 have the second in-phase input end+, the second inverting input-and the second output
End, input terminal of first pin 1 respectively with the input terminal of overvoltage/under-voltage module 41, built-in power module 43 are electrically connected,
The output end of the overvoltage/under-voltage module 41 respectively with the input terminal of logical AND drive module 37, built-in power module 43 it is defeated
Enter end to be electrically connected, the input terminal of the logical AND drive module 37 also respectively with the output end of maximum turn-off time module 39,
The output end of erasing time detecting module 38, the second output terminal of PWM comparators 36 and current constant control and output open circuit are protected
The output end of module 33 is electrically connected, the grid g2 of the output end of the logical AND drive module 37 and the second power tube Q2
Be electrically connected, the third pin 3 respectively with the output end of clamper module 35, the first output end and PWM of error amplifier 34
The second inverting input-electric connection of comparator 36, the second in-phase input end+of the PWM comparators 36 and the sawtooth
The output end of wave producer 42 is electrically connected, the 4th pin 4 respectively with the input terminal of sampling and keep module 32, the second power
The source electrode s2 of pipe Q2 is electrically connected, the 5th pin 5 respectively with the input terminal of erasing time detecting module 38, the second power tube
The drain electrode d2 of Q2 is electrically connected, and the input terminal of the sampling and keep module 32 is also electrically connected with line voltage compensation module 31, institute
The output end for stating sampling and keep module 32 is also electrically connected with current constant control and the input terminal of output open circuit protection module 33, described
The output end of current constant control and output open circuit protection module 33 also with the first inverting input-of error amplifier 34, the perseverance
The input terminal of flow control and output open circuit protection module 33 also respectively with the output end of erasing time detecting module 38 and the second work(
The grid g2 of rate pipe Q2 is electrically connected, the first in-phase input end+and the built-in power module 43 of the error amplifier 34
Output end be electrically connected.
First rectification filtering module 14 includes rectifier bridge 15 and the third being connected in parallel with 15 output end of rectifier bridge electricity
Hold C3, second rectification filtering module 19 includes the first diode D1 and the 4th capacitance being connected in series with the first diode D1
The anode of C4, the first diode D1 are electrically connected with the secondary side Ns of the transformer 18, the moon of the first diode D1
Pole is electrically connected with one end of the 4th capacitance C4, LED light incoming end 17 respectively, and the other end of the 4th capacitance C4 is used for
Connect ground wire.
The absorption circuit 16 is used to absorb the self-induced e.m.f of 18 primary side Np windings of transformer, specifically includes：Third electricity
It is defeated with the first rectification filtering module 14 respectively to hinder R3, the 5th capacitance C5 and the one end the second diode D2, the 3rd resistor R3
Go out the first end electric connection of proper pin, 18 primary side Np of one end of first resistor R1, one end of the 5th capacitance C5 and transformer,
The other end of the 3rd resistor R3 is electrically connected with the cathode of the other end of the 5th capacitance C5, the second diode D2 respectively, institute
The anode for stating the second diode D2 distinguishes the drain electrode d1 of the first power tube Q1, the second end of 18 primary side Np of transformer is electrically connected.
Wherein, the sampling and keep module 32 is used for each period real-time sampling CS crest voltages, and keeps the peak value electric
It is flat, until next primary side turn-on cycle resampling.The line voltage compensation module 31 is used to carry out AC-input voltage
CS peak compensations so that the output current of (90-264V) LED lamp drive circuit is kept constant within the scope of wide alternating current.
The saw-toothed wave generator 42 for generating sawtooth wave, the sawtooth wave be input to the second in-phase input end of PWM comparators 36+,
It is compared with the first output end output level comp of error amplifier 34, it is each to be determined according to the size of average current
Period primary side turn-on time Tonp.The logical AND drive module 37 is used to generate driving pulse according to each road signal, with driving
The second power tube Q2 being internally integrated passes through the conducting of the second power tube Q2, the 5th pin 5 (S) the i.e. source of the first power tube Q1
Pole s1 is pulled low, and the first power tube Q1 is also switched on, to realize source drive.The erasing time detecting module 38 is for passing through
The parasitic capacitance Cds of first power tube Q hourglass source electrodes detects pair side turn-on time Tons indirectly, and pair side turn-on time Tons is used for
The average current of LED light incoming end 17 is calculated according to primary side peak point current.In addition LED drive chip 22 is operated in critical discontinuous
Pattern, at the end of secondary side turn-on time Tons, the primary side Np of LED lamp drive circuit can be begun to turn on, into next cycle.
The maximum turn-off time module 39 when LED lamp drive circuit primary side Np is turned off for starting timing, when timing to most high point
Disconnected time Toff_max comes interim, and LED lamp drive circuit primary side Np can be again turned on, into next cycle, in this way it is avoided that
When startup or output short-circuit, secondary side Ns output voltages are very low, and erasing time detecting module 38 is detected less than Tons, under causing
A cycle can not be opened, and in this case, LED lamp drive circuit can open once every the Toff_max times.In described
Power module 43 is built for generating internal source voltage 5V, to power for 22 internal low-voltage device of LED drive chip, and for generating
Internal reference voltage.The overvoltage/under-voltage module 41 is used to detect the supply voltage on 22 first pin 1 of LED drive chip
Vcc, when supply voltage vcc is less than voltage threshold Vst is started, LED drive chip 22 is closed, and is hardly consumed
Electric current, at this time line voltage Vin by first resistor R1 to the first capacitance C1 charging, when the voltage of the first capacitance C1 is higher than starting electricity
When pressing threshold value Vst, LED drive chip 22 starts, and LED lamp drive circuit is started to work.Hereafter in case of various protections, LED
Driving chip 22 can close output pulse, and supply voltage vcc is pulled low to another threshold by inside the second power tube Q2
Value VL (Vst>VL) hereinafter, then LED drive chip 22 can be again introduced into standby mode, electric current is hardly consumed.Then line voltage
Vin gives the first capacitance C1 chargings by first resistor R1 again, starts voltage threshold until the voltage on the first capacitance C1 is more than
Vst, LED drive chip 22 are again started up, and are so recycled, therefore the various protections of LED drive chip 22 have automatic recovery work(
Can, once abnormal conditions disappear, LED drive chip 22 can restart and restore to work normally automatically.The clamper module 35 is used for
Clamper is carried out to the output level comp of 34 first output end of error amplifier, so that it is no more than 2V, due to the slope of sawtooth wave
It is fixed, the maximum turn-on time of primary side Np can be controlled by the clamper of the output level comp of the first output end in this way, makes it
No more than setting value, to protect the safety of entire LED lamp drive circuit when being abnormal.The current constant control is opened with output
Road protection module 33 is used to the primary side crest voltage Vcsp sampled being converted into the average electricity of LED light incoming end 17 by operation
Stream participates in the control of constant current loop so that constant output current；In addition it also passes through erasing time and the primary side crest voltage
Correlation technology between Vcsp, detects output voltage indirectly, for use in output LED open-circuit-protections.
Fig. 4 and Fig. 5 is please referred to, the erasing time detecting module 38 includes clamp diode D3, first voltage comparator
52 and latching logic module 54, the first voltage comparator 52 have third in-phase input end+, third inverting input-and
Third output end, the anode of the clamp diode D3 respectively with the 5th pin 5, the source electrode s1 of the first power tube Q1 and third
The cathode of in-phase input end+connection, the clamp diode D3 electrically connects with the first pin 1, third inverting input-respectively
Connect, the third output end and the latching logic module 54 are electrically connected, the latching logic module 54 also respectively with it is described
Logical AND drive module 37, current constant control and output open circuit protection module 33 are electrically connected.
The detecting principle of secondary side turn-on time Tons is as follows：When the signal gate on the grid g2 of the second power tube Q2 is height
When, the second power tube Q2 conducting that LED drive chip 22 is internally integrated, the signal on the 5th pin 5 is pulled low, due to external the
The grid g1 of one power tube Q1 is directly connected to supply voltage vcc, therefore the gate source voltage (Vgs=vcc-Vcs of the first power tube Q1
≈ vcc) much larger than its unlatching threshold value, therefore the first power tube Q1 is connected therewith, i.e., primary side is connected, at this time on the 5th pin 5
Voltage peak-peak is that Vcsp is much smaller than supply voltage vcc, therefore (node a) is the third output end of first voltage comparator 52
Low level；At the end of primary side turn-on time Tonp, the signal gate on the grid g2 of the second power tube Q2 becomes low level, the
Two power tube Q2 are closed, and the voltage on the 5th pin 5 increases, and the first power tube Q1 is closed immediately therewith, the first power tube Q1's
Drain electrode d1 terminal voltages be increased to it is more taller than line voltage Vin after, make secondary side Ns voltages higher than after output voltage Vout, the one or two pole
Pipe D1 forward conductions, secondary side Ns, which is begun to turn on, to discharge, and during secondary side Ns is connected, transformer 18 maintains the first power tube Q1
Drain electrode d1 terminal voltages always above line voltage Vin.In the process moment of primary side Np shutdowns, pair side Ns conductings, due to the first work(
Rate pipe Q1 has hourglass source electrode parasitic capacitance Cds, and according to circuit theory, capacitance voltage difference of the two ends cannot be mutated, the first power tube
The drastically raising of the drain electrode d1 terminal voltages (the hourglass source electrode parasitic capacitance Cds top crowns voltage) of Q1 so that the first power tube Q1's
Source electrode s1 terminal voltages (the hourglass source electrode parasitic capacitance Cds bottom crowns voltage) are also and then raised, and are finally clamped diode D3 pincers
Position vcc+Vd level (wherein, vcc is supply voltage, and Vd is the forward conduction voltage drop of clamp diode), therefore on secondary side
Moment is connected in Ns, and (node a) becomes high level, latching logic module to the third output end of first voltage comparator 52 from low level
54 detect this rising edge after it latched and be transmitted to logical AND drive module 37, i.e. Tons becomes high level.This
Sample is fallen after rise rapidly until secondary Ns voltages while secondary at the end of Ns discharges, and the voltage of node b is also fallen after rise rapidly, and enters resonance,
The moment of the current path of node b, since the both end voltage of the hourglass source electrode parasitic capacitance Cds of the first power tube Q1 cannot be mutated,
Therefore the voltage on the 5th pin 5 also and then falls back to rapidly the level less than supply voltage vcc, at this time first voltage comparator
(node a) is low level from high level overturning to 52 third output end, and latching logic module 54 detects after the failing edge immediately
Logical AND drive module 37 is latched and is transmitted to, i.e. Tons becomes low level, then latches always until the second work(of next period
Signal gate on the grid g2 of rate pipe Q2 is just unlocked again when being high level, and this avoid the sections that may be because that resonance is brought
The influence that point a is overturn repeatedly；Therefore it is high level in secondary side Ns conducting phases Tons, is low level in remaining time, to
Secondary side turn-on time Tons is accurately detected.In addition, LED drive chip 22 works in critical discontinuous mode, when detecting pair
At the end of side Ns discharges, i.e., when Tons is from high to low, logical AND drive module 37 can export high level to the second power immediately
The grid g2 of pipe Q2, to make primary side Np be connected, into next cycle.
Secondary side discharge peak currents Ips=Ipp* (Np/Ns), wherein primary side peak point current Ipp=Vcsp/Rcs, Vcsp are
Crest voltage on primary side Np current senses resistance (i.e. second resistance R2), crest voltage Vcsp can be by sampling and keep modules 32
Each cycle sampling is primary, and preserves this crest voltage Vcsp and input to current constant control and output open circuit protection module 33, and Rcs is original
The resistance value (resistance value of second resistance R2) of side current sense resistance, Np/Ns are the turn ratio on transformer primary pair side.And secondary side output
Average current Io=(Ips*Tons)/(2*T)=[Vcsp* (Tons/T)] * [Np/ (2*Ns*Rcs)], T is switch periods.
Referring to Fig. 6, the current constant control includes with output open circuit protection module 33：Unity gain buffer 55, first
To the 4th switch K1, K2, K3, K4, the 4th resistance R4, the 6th capacitance C6, the 7th capacitance C7, the first phase inverter 56, the second reverse phase
Device 57, second voltage comparator 58, current source 59 and three input nor gate 60, and the second voltage comparator 58 is same with the 4th
Phase input terminal+, the 4th inverting input-and the 4th output end, the unity gain buffer 55 has the 5th in-phase input end
+, the 5th inverting input-and the 5th output end, the 5th in-phase input end+respectively and the 4th inverting input+, sampling protects
The electric connection of module 32 is held, the 5th inverting input-and the 5th output end are electrically connected, and the 5th output end is also with the
The first end of one switch K1 is electrically connected, the control terminal of the first switch K1 be used to provide in erasing time detecting module 38
The output end of erasing time connects, the second end of the first switch K1 respectively with one end of the 4th resistance R4, second switch K2
Second end be electrically connected, the other end of the 4th resistance R4 respectively with logical AND drive module 54, the 6th capacitance C6 one
End is electrically connected, and the other end and the ground wire of the 6th capacitance C6 are electrically connected, the control terminal and first of the second switch K2
The output end of phase inverter 56 connects, and first end and the ground wire of the second switch K2 are electrically connected, first phase inverter 56
Input terminal is electrically connected with the erasing time detecting module 38, and the 4th in-phase input end+respectively with third switch K3's
The second end electric connection of first end, one end of the 7th capacitance C7, the 4th switch K4, the other end and the ground of the 7th capacitance C7
Line is electrically connected, and the control terminal of the third switch K3 is electrically connected with the output end of the second phase inverter 57, the third switch
The second end of K3 is connect with current source 59, the control terminal of the 4th switch K4 respectively with the grid g2 of the second power tube Q2,
The input terminal of two phase inverters 57 is electrically connected, and first end and the ground wire of the 4th switch K4 are electrically connected, the 4th output
The first input end that end inputs nor gate 60 with logical AND drive module 37, three respectively is electrically connected, the three inputs nor gate
The output end Tons of 60 the second input terminal and erasing time detecting module 38, the third input terminal of the three inputs nor gate 60
It is connect with the grid g2 of the second power tube Q2, the input of the output end and logical AND drive module 37 of the three inputs nor gate 60
End is electrically connected.
The principle that the current constant control exports average current signal Vavg with output open circuit protection module 33 is as follows：The list
The primary side peak point current sampled signal Vcsp of not driving capability is converted to following for current capacity by position gain buffer 55
Voltage Vcs1, Vcs1=Vcsp；When secondary side Ns discharges, Tons is high level, and first switch K1 is connected, and second switch K2 is closed,
Follow voltage Vcs1 by the 4th resistance R4 to the 6th capacitance C6 chargings at this time；And the other times terminated in secondary side Ns electric discharges
Interior, first switch K1 is closed, and second switch K2 conductings, the 6th capacitance C6 is discharged over the ground by the 4th resistance R4 at this time.Due to
Four resistance R4 and the 6th capacitance C6 constitute RC filter circuits, the average current signal Vavg in LED lamp drive circuit steady operation
Its average value is fixed identical in each semifocal chord wave period, follows voltage Vcs1 to the 6th capacitance C6 in the period each in this way
Quantity of electric charge Qin=[(Vcs1-Vavg)/R1] * Tons of charging, and the electricity Qout that each the 6th capacitance C6 of period discharges over the ground
=(Vavg/R1) * (T-Tons), average current signal Vavg its average value in each semifocal chord wave period is when due to stablizing
Fixation is identical, therefore total charge capacity of the 6th capacitance C6 will be equal to total discharge electricity amount, that is, Qin in each semifocal chord wave period
=Qout, therefore Vavg=Vcsp* (Tons/T) is obtained, and by above it is understood that secondary side exports average current
Io=[Vcsp* (Tons/T)] * [Np/ (2*Ns*Rcs)]=Vavg*K
K=Np/ (2*Ns*Rcs),
As the resistance value Rcs of 18 parameter of transformer and primary current the detecting resistance (second resistance R2) of LED lamp drive circuit
After determination, K is exactly that a constant, average current signal Vavg=Io/K, therefore average current signal Vavg and secondary side output are flat
Equal electric current is directly proportional, and the detection signal of average current can be exported as secondary side.And the effect of error amplifier 34 is exactly dynamic
Ground adjusts loop so that secondary side output average current Io is equal to setting value.When secondary side, output average current Io is less than setting value,
The average value of Vavg is less than internal reference voltage (being provided by built-in power module), the output level (third of error amplifier 34
Signal on pin comp) it can raise so that the time that PWM comparators 36 export high level is elongated, and then primary side Np is made to be connected
Time is elongated, then primary side peak-current signal Vcsp also increases, so that secondary side output average current Io also increases；Conversely,
When secondary side, output average current Io is greater than the set value, constant current loop then declines primary side peak point current, then primary side peak point current
Signal Vcsp declines, and secondary side output average current Io declines therewith.Under the dynamic regulation of such loop, final LED light driving
When circuit stability, in a semifocal chord wave period after rectification, the average voltage of Vavg can be equal to internal reference voltage, therefore whole
In a semifocal chord wave period, output average current is equal to setting value, and each semifocal chord wave period is the same, to realize that constant current is defeated
Go out, to drive LED light 20.
Further, since external larger compensating electric capacity the second capacitance C2 of third pin 3, therefore it is steady in LED lamp drive circuit
Periodically, the level on third pin 3 is substantially stable, is fixed to the primary side Np turn-on times Tonp in each period
, when period primary side Np each in this way is connected, primary side peak point current Ipp=(Vin/Lp) * Tonp, Lp are transformer primary side sense
Amount, therefore the variation of the string wave envelope with line voltage Vin, Ipp also change in proportion, on-Line Voltage Vin gets over eminence primary side electricity
Stream Ipp is bigger, and the energy of transmission is also bigger, and to realize very high power factor (PF), power grid pressure is effectively relieved.
The principle of output over-voltage protection (i.e. LED open-circuit-protections) is as follows：When primary side Np is connected, the second power tube Q2 grids
Signal gate on g2 is high level, and the 4th switch K4 conductings, third switch K3 are closed, and the 7th capacitance C7 is grounded, both ends
Voltage is 0, and after primary side NP shutdown, pair side Ns is when beginning to turn on, and the signal gate on the second power tube Q2 grids g2 is low electricity
Flat, third switch K3 conductings, the 4th switch K4 is closed, and current source 59 starts to the 7th capacitance C7 chargings, and the 7th capacitance C7 is powered on
Pressure Vc slowly rises from zero, when rising to the primary side crest voltage Vcsp threshold values of this period sampled holding, the second comparator
58 overturnings, being conducting to this period that the second comparator 58 is overturn from primary side Np shutdowns, pair side Ns, we term it minimum demagnetizations
Time Tons_min；So Tons_min=(Vcsp*C7)/I1, I1 are the output current of current source 59, the i.e. time and this week
Phase, primary side crest voltage Vcsp was directly proportional, since LED lamp drive circuit has the function of Active PFC, with line voltage Vin
The raising of semifocal chord wave, primary side crest voltage Vcsp are also increased, therefore minimum erasing time Tons_min can also increase.
And secondary side turn-on time
Tons=(Ips*Ls)/(Vout+Vz)=[Vcsp*Np*Lp]/[Ns*Rcs* (Vout+Vz)]
=[Vcsp/ (Vout+Vz)] * K1 wherein K1=(Np*Lp)/(Ns*Rcs), Ls are secondary side sensibility reciprocal
After the resistance value Rcs of 18 parameter of transformer and second resistance R2 is determined, K1 is exactly a constant, then secondary side conducting
Time Tons is directly proportional to primary side crest voltage Vcsp, is inversely proportional with output voltage.In this way when exporting LED open circuits, due to every
A period primary side all can transmit energy to secondary side Ns, and output voltage can be increased ceaselessly, and secondary side turn-on time Tons can be ceaselessly
It reduces, as the secondary turn-on time minimum value Tons_min when turn-on time Tons is narrowed down to less than pair, that is, in Tons_min
=0, gate=0 (primary side shutdown) and Tons=0 (secondary side electric discharge terminates), then the output of three input nor gates 60 can overturn and be
High level, we, which are considered as having occurred, at this time exports LED open-circuit-protections.
The condition that LED open circuits occur is Tons<Tons_min,
[Vcsp/(Vout+Vz)]*K1<(Vcsp*C7)/I1
Vout>K1*(I1/C7)
Therefore by rationally designing the output current I1 of current source 59, the value of the 7th capacitance C7,18 parameter of external transformer
With second resistance R2 resistance value Rcs, we are assured that the threshold value of output over-voltage protection.Pass through primary side crest voltage Vcsp and pair
The correlation technology of side turn-on time Tons so that the threshold value of overvoltage protection is not influenced by the Vcsp variations of primary side crest voltage, from
And make single- stage PFC system that there is output LED open circuit protecting functions.
In conclusion the present invention provides a kind of LED lamp drive circuit of double winding single-stage primary side feedback, source electrode is used to drive
The LED drive chip of dynamic technology, and the erasing time is detected by the parasitic capacitance of external first power tube source-drain electrode indirectly
Tons (i.e. secondary side turn-on time)；Also by the control method of fixed primary side turn-on time Tonp come realize very high power because
Element alleviates power grid pressure；By the correlation technology of secondary side turn-on time and primary current peak value, the open circuit of output LED is realized
Protection；Further, since LED drive chip has extremely low operating current, can directly be powered by line voltage by first resistor, from
And it is required for LED drive chip power supply and erasing time, output electricity that existing primary side feedback LED drive circuit is omitted
The auxiliary winding of detecting, transformer is pressed only to need primary side winding and vice-side winding, simplify the manufacturing process flow of transformer, into
One step reduces cost.
The above is merely preferred embodiments of the present invention, be not intended to restrict the invention, it is all the present invention spirit and
All any modification, equivalent and improvement made by within principle etc., should all be included in the protection scope of the present invention.
Claims (6)
1. a kind of LED lamp drive circuit of double winding single-stage primary side feedback, which is characterized in that including：AC input, first
Rectification filtering module, absorption circuit, transformer, the second rectification filtering module, LED light incoming end, the first power tube, LED drivings
Chip, first resistor, second resistance, the first capacitance and the second capacitance, the LED drive chip have first to the 5th to draw
The input terminal of foot, first rectification filtering module is connect with AC input, the output of first rectification filtering module
Proper pin is electrically connected with the first end of one end of first resistor, the input terminal of absorption circuit and transformer inputs respectively,
The other end of the first resistor is electrically connected with the grid of one end of the first capacitance, the first pin and the first power tube respectively,
The drain electrode of first power tube is electrically connected with the second end of the output end of absorption circuit, transformer inputs respectively, described
The source electrode of first power tube and the 5th pin are electrically connected, the first end of the transformer output end and second rectifying and wave-filtering
The input of module is rectified pin and is electrically connected, and pin and LED light incoming end electricity are rectified in the output of second rectification filtering module
Property connection, one end of the second resistance and the 4th pin be electrically connected, and one end of second capacitance and third pin are electrical
Connection, the output end of first rectification filtering module bear pin, second pin, the other end of the first capacitance, the second capacitance
The other end, the other end of second resistance, the second end of transformer output end and the second rectification filtering module output end negative draw
Foot is electrically connected with ground wire；
The LED drive chip includes：Line voltage compensation module, sampling and keep module, current constant control and output open circuit protect mould
Block, error amplifier, clamper module, PWM comparators, logical AND drive module, erasing time detecting module, maximum turn-off time
Module, overvoltage/under-voltage module, saw-toothed wave generator, built-in power module and the second power tube, the error amplifier have
First in-phase input end, the first inverting input and the first output end, the PWM comparators have the second in-phase input end, the
Two inverting inputs and second output terminal, first pin input terminal, the built-in power module with overvoltage/under-voltage module respectively
Input terminal be electrically connected, the output end of the overvoltage/under-voltage module respectively with the input terminal of logical AND drive module, built-in electricity
The input terminal of source module is electrically connected, and the input terminal of the logical AND drive module is also defeated with maximum turn-off time module respectively
Outlet, the output end of erasing time detecting module, the second output terminal of PWM comparators and current constant control and output open circuit are protected
The output end of module is electrically connected, and the output end of the logical AND drive module and the grid of second power tube electrically connect
Connect, the third pin respectively with the output end of clamper module, the first output end of error amplifier and PWM comparators second
Inverting input is electrically connected, the second in-phase input end of the PWM comparators and the output end electricity of the saw-toothed wave generator
Property connection, the 4th pin is electrically connected with the source electrode of the input terminal of sampling and keep module, the second power tube respectively, described the
Five pins are electrically connected with the drain electrode of the input terminal of erasing time detecting module, the second power tube respectively, and the sampling keeps mould
The input terminal of block is also electrically connected with line voltage compensation module, output end and the current constant control and output of the sampling and keep module
The input terminal of open-circuit-protection module is electrically connected, and the current constant control and the output end of output open circuit protection module are also put with error
The first inverting input connection of big device, the input terminal of the current constant control and output open circuit protection module also respectively with demagnetization when
Between detecting module output end and the second power tube grid be electrically connected, the first in-phase input end of the error amplifier with
The output end of the built-in power module is electrically connected；
The absorption circuit is used to absorb the self-induced e.m.f of transformer primary side winding, and the line voltage compensation module is used for exchange
Input voltage carries out peak compensation, and the sampling and keep module, which is used to acquire, detects the second of resistance as primary side current of transformer
Ohmically crest voltage, and the crest voltage is inputed into current constant control and output open circuit protection module, the current constant control
It is electrically connected with the output end of output open circuit protection module and the first inverting input of error amplifier for amplifying to error
Device provides average current value, and the clamper module is used to carry out clamper, institute to the output level of the first output end of error amplifier
Logical AND drive module is stated to be used to generate driving pulse according to each road signal, it is described to drive the second power tube being internally integrated
Erasing time detecting module is used to detect pair side turn-on time indirectly by the parasitic capacitance of the first power tube hourglass source electrode, it is described most
Big shutdown time module when LED lamp drive circuit primary side turns off for starting timing, when timing to maximum turn-off time is arrived
When, LED lamp drive circuit primary side can be again turned on, and into next cycle, the overvoltage/under-voltage module is for detecting LED drives
Supply voltage on the first pin of dynamic chip, for the saw-toothed wave generator for generating sawtooth wave, which is input to PWM ratios
Compared with the second in-phase input end of device, the built-in power module is for generating internal source voltage.
2. the LED lamp drive circuit of double winding single-stage primary side feedback according to claim 1, which is characterized in that the change
Depressor includes primary side and secondary side.
3. the LED lamp drive circuit of double winding single-stage primary side feedback according to claim 1, which is characterized in that described
One rectification filtering module includes rectifier bridge and the third capacitance that is connected in parallel with the output end of rectifier bridge, second rectifying and wave-filtering
Module includes the first diode and the 4th capacitance that is connect with the first Diode series, the anode of first diode with it is described
The secondary side of transformer is electrically connected, the cathode of first diode respectively with one end of the 4th capacitance, LED light incoming end
It is electrically connected, the other end of the 4th capacitance is for connecting ground wire.
4. the LED lamp drive circuit of double winding single-stage primary side feedback according to claim 1, which is characterized in that the suction
Withdrawing road includes：3rd resistor, the 5th capacitance and the second diode, described 3rd resistor one end respectively with the first rectifying and wave-filtering mould
The first end that pin, one end of first resistor, one end of the 5th capacitance and transformer primary side are rectified in the output of block is electrically connected, institute
The other end for stating 3rd resistor is electrically connected with the cathode of the other end of the 5th capacitance, the second diode respectively, and the described 2nd 2
The anode of pole pipe is electrically connected with the second end of the drain electrode of the first power tube, transformer primary side respectively.
5. the LED lamp drive circuit of double winding single-stage primary side feedback according to claim 1, which is characterized in that described to disappear
Magnetic time detecting module includes clamp diode, first voltage comparator and latching logic module, the first voltage comparator
With third in-phase input end, third inverting input and third output end, the anode of the clamp diode is respectively with the 5th
Pin, the source electrode of the first power tube and the connection of third in-phase input end, the cathode of the clamp diode draw with first respectively
Foot, third inverting input are electrically connected, and the third output end is electrically connected with the latching logic module, and the latch is patrolled
Module is collected also to be electrically connected with the logical AND drive module, current constant control and output open circuit protection module respectively.
6. the LED lamp drive circuit of double winding single-stage primary side feedback according to claim 1, which is characterized in that the perseverance
Flow control includes with output open circuit protection module：Unity gain buffer, first to fourth switch, the 4th resistance, the 6th capacitance,
7th capacitance, the first phase inverter, the second phase inverter, second voltage comparator, current source and three input nor gates, second electricity
Pressure ratio has the 4th in-phase input end, the 4th inverting input and the 4th output end, the unity gain buffer to have compared with utensil
5th in-phase input end, the 5th inverting input and the 5th output end, the 5th in-phase input end are defeated with the 4th reverse phase respectively
Enter end, sampling and keep module is electrically connected, the 5th inverting input and the electric connection of the 5th output end, the 5th output
End also with the first end of first switch be electrically connected, the control terminal of the first switch in erasing time detecting module be used for carry
For the output end connection of erasing time, the second end of the first switch respectively with one end of the 4th resistance, second switch the
Two ends are electrically connected, the other end of the 4th resistance as export the output end of average current value respectively with error amplifier
One end electric connection of first inverting input, the 6th capacitance, the other end and the ground wire of the 6th capacitance are electrically connected, described
The control terminal of second switch is connect with the output end of the first phase inverter, and first end and the ground wire of the second switch are electrically connected,
The input terminal of first phase inverter and the erasing time detecting module are electrically connected, the 4th in-phase input end respectively with
The second end electric connection of the first end of third switch, one end of the 7th capacitance, the 4th switch, the other end of the 7th capacitance
It is electrically connected with ground wire, the control terminal and the output end of the second phase inverter of the third switch are electrically connected, the third switch
Second end connect with current source, the control terminal of the 4th switch respectively with the grid of the second power tube, second phase inverter
Input terminal is electrically connected, and first end and the ground wire of the 4th switch are electrically connected, the 4th output end respectively with logical AND
The first input end electric connection of drive module, three input nor gates, the second input terminal of the three inputs nor gate and demagnetization
The third input terminal of the output end of time detecting module, the three inputs nor gate is connect with the grid of the second power tube, described
The output end and the input terminal of logical AND drive module of three input nor gates are electrically connected.
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| CN107396498B (en) | 2015-09-14 | 2019-07-23 | 昂宝电子（上海）有限公司 | System and method for the current regulation in LED illumination system |
| CN105141137B (en) * | 2015-09-17 | 2017-10-31 | 无锡硅动力微电子股份有限公司 | Control circuit for switching power converters |
| CN107346945B (en) * | 2016-05-06 | 2019-08-09 | 三垦电气株式会社 | Switching power unit and semiconductor device |
| CN106714367B (en) * | 2016-11-16 | 2018-11-09 | 深圳市必易微电子有限公司 | Constant-current circuit and its constant-current controller |
| CN106793250B (en) * | 2016-11-21 | 2018-11-20 | 深圳市必易微电子有限公司 | Constant-current circuit and constant-current controller |
| CN108135045B (en) * | 2016-11-30 | 2023-12-26 | 华润微集成电路(无锡)有限公司 | Output overvoltage protection method and circuit |
| CN108631555A (en) * | 2018-03-28 | 2018-10-09 | 成都启臣微电子股份有限公司 | A kind of overpower constant circuit of double winding Switching Power Supply |
| CN110829383B (en) * | 2019-11-15 | 2021-08-27 | 成都启臣微电子股份有限公司 | Multi-mode protection circuit of double-winding secondary feedback switching power supply |
| US11990898B2 (en) * | 2022-02-23 | 2024-05-21 | Hamilton Sundstrand Corporation | Parasitic immune isolated drive |
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