CN104717797B - L ED light engine, and integrated circuit and lighting device with same - Google Patents
L ED light engine, and integrated circuit and lighting device with same Download PDFInfo
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- CN104717797B CN104717797B CN201410755749.7A CN201410755749A CN104717797B CN 104717797 B CN104717797 B CN 104717797B CN 201410755749 A CN201410755749 A CN 201410755749A CN 104717797 B CN104717797 B CN 104717797B
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Abstract
A L ED light engine powered by alternating current is provided and coupled between a rectifier and a plurality of external L ED subarrays. L ED light engine includes a plurality of normally closed bypass switches, a normally closed current regulator, and a plurality of switch controllers, each normally closed bypass switch except for a highest or lowest stage L ED subarray is coupled in parallel to a corresponding L ED subarray and shuttles between conducting, regulating, or closing three switch states.
Description
Technical field
The present invention relates to one kind with Alternating Current Power Supply (ac-powered) LED light engine, particularly to according to after rectification
String ripple input voltage voltage level, control the quantity lighted or extinguished of multiple LED subarrays and the LED light of current value
Engine.
Background technology
Lighting device based on light emitting diode (Light Emitting Diode, LED), has the relatively long longevity
Order, be less susceptible to by the interference effect of external environment and less easily damaged, therefore be increasingly becoming the first choice of lighting apparatus.
Technically, LED needs direct current (Direct Current, DC) to drive.Therefore, typically must be whole with all-wave or half-wave
Stream device will exchange (Alternating Current, AC) string wave voltage source (sinusoidal voltage source) rectification
, just can be driving LED behind string wave voltage source after rectification.And civil power is alternating current, when alternating current changes into direct current,
Near the initial end of each cycle of DC pulse and the low-voltage section of end (being called during doing zero load), input voltage now
Method there is no to overcome the forward drop (forward voltage drop) of light emitting diode to drive light emitting diode.The unloaded phase
Between with the angle of flow (conduction angle) totalling form rectification after string ripple input voltage a complete cycle.It is unloaded
Period is longer, and the angle of flow is smaller, and line current is narrower and can not cause power factor (power similar in appearance to the waveform of line voltage
Factor it is) relatively low.The problem of traditional LED driver (LED driver) often is faced with three kinds of applications.
First problem is that traditional LED driver must use wave filter, rectifier and power factor corrector
(power factor corrector, PFC) etc. complex drive circuit (driver circuit), causes driver
It is with high costs.Meanwhile though the life-span of light emitting diode it is long, electrolytic capacitor used by power factor corrector
(electrolytic capacitor) is easily damaged, and bulk life time is relative to be shortened, the advantages of can not playing light emitting diode.
Second Problem is during zero load, without electric current by light emitting diode, causes the scintillation of lighting apparatus
(flicker phenomenon).LED is that timing is rapidly lit in driving current, and is extinguished when driving current is 0.Cause
This, if there is the presence during zero load, will cause scintillation.Scintillation is to exchange the doubled frequency of string ripple, repeatedly
During betiding zero load.
3rd problem is that power factor is low, is generally occurred in the power factor corrector using low-power, Wu Fajing
When really detecting faint loop current correctly to correct AC input current waveform as sinusoidal waveform.Power factor to
Electricity usage efficiency is weighed, when the similarity of line voltage and line current is higher, expression electricity usage efficiency is better, and power factor
It is higher.The input voltage waveform of usual alternating current is sine wave, and the electric current of successive load is if close to sine wave, its harmonic wave quantity
Few, harmonic distortion is just few, then power factor is higher.When input current is consistent with waveform with the phase of input voltage, power because
Count close to maximum 1.
Traditional power factor corrector needs measure loop electric current, with modified line current alignment line voltage.When loop electricity
Stream is too low to stage accurately in power factor corrector measured by current detection circuit, power factor corrector
It will be unable to keep line current consistent with waveform with the phase of line voltage and reach preferable power factor.Often and low power factor
That mention in the same breath is high total harmonic distortion (total harmonic distortion (THD)), according to fourier progression expanding method
Theory, any periodic signal high-order harmonic wave that any discontinuous or jump will be resulted on fundamental frequency component in periodic waveform,
Total harmonic distortion is caused to raise.High total harmonic distortion caused by discontinuous or jump in AC input current waveform and zero load
The presence of period is related.
Simplify circuit, reduce cost, improve the scintillation of light emitting diode lighting equipment and improve power factor, still
It is the major subjects of the research and development of current LED source.The solution that the present inventor is provided, have and can be directly used for
Alternating current circuit, cost are cheap, excellent performance, are hardly damaged and circuit is simple, flicker free phenomenon and to improve power factor etc. excellent
Point, the details will be described later.
The content of the invention
According to one embodiment of present invention, a kind of LED light engine with Alternating Current Power Supply is disclosed, is coupled to rectifier and more
Between individual external LED subarray.LED light engine includes multiple normally closed bypass cocks, normally closed current regulator and multiple switch
Controller.In addition to most higher level or most subordinate LED subarrays, each normally closed bypass cock coupled in parallel is in corresponding LED
Array, and shuttle in conducting, regulation or close three kinds of on off states.Normally closed current regulator is coupled to multiple normally closed bypass and opened
Close, to the highest LED current level of the peak value of adjusting proximity external voltage source.Each switch controller is respectively coupled to corresponding side
Pass is opened up using as feedback network, and to current detection signal, controlling switch state corresponding to.
According to one embodiment of present invention, a kind of integrated circuit is disclosed, includes the LED light of foregoing AC power
Engine, the LED light engine of the AC power can be implemented in the form of any.
According to one embodiment of present invention, a kind of lighting device is disclosed, and the LED light comprising rectifier and AC power is drawn
Hold up.Rectifier is coupled to AC power, to provide the voltage after rectification.The LED light engine of AC power, is coupled to rectifier
Between the LED subarrays of multiple outsides, wherein LED light engine includes multiple normally closed bypass cocks, normally closed current regulator, more
Individual current sense resistor and multiple switch controller.Except most higher level or the LED subarrays of most subordinate in outside LED subarrays
Outside, each normally closed bypass cock is parallel to corresponding LED subarrays respectively, and shuttles in three kinds of switches of conducting, regulation and cut-off
State.Each normally closed current regulator is respectively coupled to the multiple normally closed bypass cock, to adjusting proximity external voltage source
The highest LED current level of peak value.Each current sense resistor is connected to the LED subarrays of the multiple outside.Each switch
Controller be respectively coupled to corresponding to current sense resistor and corresponding bypass cock using as feedback network, and to according to right
The current detection signal answered, control the multiple on off state.
Brief description of the drawings
For the above of the present invention can be become apparent, hereafter especially exemplified by preferred embodiment, and coordinate institute's accompanying drawings,
Elaborate, wherein：
Figure 1A shows the block schematic diagram of lighting device 1 according to an embodiment of the invention, lighting device 1 have with
The LED light engine 10 of Alternating Current Power Supply, LED light engine 10 designed according to one embodiment of present invention is to point from lower to upper
LED subarrays G1, G2, G3 and G4 of bright interspersed setting and extinguish from top to bottom interspersed LED subarrays G1, G2, G3 set and
G4。
Figure 1B shows the block schematic diagram of lighting device 2 according to an embodiment of the invention, and it has is supplied with exchanging
The LED light engine 20 of electricity, LED light engine 20 designed according to one embodiment of present invention are interspersed to light from top to bottom
LED subarrays G1, G2, G3 and G4 of setting and LED subarrays G1, G2, G3 and the G4 for extinguishing interspersed setting from lower to upper.
Fig. 1 C show the block schematic diagram of lighting device 3 according to an embodiment of the invention, and it has is supplied with exchanging
The LED light engine 30 of electricity, the LED light engine 30 according to designed by another embodiment of the present invention set to light series connection from lower to upper
LED subarrays G1, G2, G3 and G4's that LED subarrays G1, G2, G3 and G4 for putting and extinguishing from top to bottom is arranged in series.
Fig. 1 D show the block schematic diagram of lighting device 4 according to an embodiment of the invention, and it has is supplied with exchanging
The LED light engine 40 of electricity, LED light engine 40 designed according to still another embodiment of the invention lighting series connection from lower to upper
LED subarrays G1, G2, G3 and G4's that LED subarrays G1, G2, G3 and G4 of setting and extinguishing from top to bottom is arranged in series.
During Fig. 2 is shown according to one embodiment of present invention, when with the LED light engine of Alternating Current Power Supply in point in a cycle
During LED subarrays that are bright and extinguishing subsection setup, LED current and the waveform diagram of both string ripple input voltages after rectification.
Fig. 3 A show the schematic diagram of integrated circuit according to an embodiment of the invention, and the integrated circuit has with exchange
The light engine of power supply.
Fig. 3 B show the schematic diagram of integrated circuit according to another embodiment of the present invention, and the integrated circuit has with exchange
The light engine of power supply.
Fig. 4 shows that Figure 1A LED light engine with Alternating Current Power Supply such as is applied to the schematic diagram of lighting device.
Fig. 5 shows that the LED light engine with Alternating Current Power Supply of one embodiment such as Fig. 1 C is applied to the signal of lighting device
Figure.
Fig. 6 shows that the LED light engine with Alternating Current Power Supply of another embodiment such as Fig. 1 C is applied to the signal of lighting device
Figure.
Fig. 7 shows that the LED light engine with Alternating Current Power Supply of another embodiment such as Fig. 1 D is applied to the signal of lighting device
Figure.
Description of reference numerals
AC alternating-current voltage sources
1st, 2,3,4,5,6,7,8 lighting device
10th, 20,30,40 control circuit
100 rectifiers
120th, 120 ' current regulator
S1, S2, S3, S4, S0, Sn-1, Sn bypass cock
G0, G1, G2, G3, G4, Gn-1, Gn LED subarrays
T0, T T10, T20, T30, T5, T15, T25, T35, Tn-1, Tn switch controller
R10, R20, R30, R10 ', R20 ', R30 ', R5, R15, R25, R35, Rx, Rd current sense resistor
T0, t1, t2, t3, t3 ', t2 ', t1 ', the t0 ' times
A, D, E, F, G, H, I, J, K, N, O, P, Q, S, T, U, V, W pin
12nd, 22 integrated circuit
R1, R2 divider resistance
Ra0, Ra, Ra1, Ra2, Ra3, Ra4, Ran-1, Ran gate pole charging resistor
B, B1, B2, B3, B7, B8, B9, Bn-1, Bn bipolar junction transistor
E, f, g, e ', f ', g ', h ' taps
The anti-clamp resistance of Rb0, Rb1, Rb2, Rb3
Rd1, Rd2, Rd3, Rv1, Rv2, Rv3 current-limiting resistance
Rz1, Rz2, Rz3 gate pole discharge resistance
Rg1, Rg2, Rg3 divider resistance
Z1, Z2, Z3 voltage clamping Zener diode
R1, R2 divider
180th, 182,184 determine voltage regulator
D1, D2, D3 gate pole discharge diode
D5, D6, D7 interference defence diode
C1, C2, C3 ceramic condenser
Z4, Z5, Z6 voltage clamping Zener diode
X shunt regulators
M, S0 current regulating switch
D8, D9, D10, D11 electric current retain diode
Cg1, Cg2, Cg3, Cg4 flicker suppress electric capacity
PC0, PC1, PC2, PC3 photo-coupler
PD0, PD1, PD2, PD3 voltage ratio are compared with optical diode
PT0, PT1, PT2, PT3 gate pole electric discharge optotransistor
Embodiment
One embodiment of the present of invention will be itemized under, and described preferred embodiment is only used for explaining and illustrated
Purpose, it is not limited to the scope of the present invention.
Figure 1A shows the block schematic diagram of lighting device 1 according to an embodiment of the invention, lighting device 1 have with
The LED light engine 10 of Alternating Current Power Supply (AC mains), it can be used to from bottom to top light the LED of interspersed (interspersed) setting
Subarray and the LED subarrays (G1, G2, G3 and G4) for from top to bottom extinguishing interspersed setting.Lighting device 1 includes being coupled to exchange
Power supply AC rectifier 100, the LED light engine 10 with Alternating Current Power Supply, and multiple current sense resistor R10, R20 and R30, and
It is equipped with multiple external LED subarray G1, G2, G3 and G4.
Rectifier 100 and interspersed LED subarrays (G1, G2, G3 set are coupled to the LED light engine 10 of Alternating Current Power Supply
And G4) between, there is normally closed current regulator 120, multiple normally closed bypass cocks (S1, S2 and S3) and multiple switch controller
(T10, T20 and T30).Normally closed current regulator 120 is coupled to rectifier 100 by its high-pressure side and passes through LED submatrixs to adjust
The maximum current level of row (close to the peak value of the string ripple input voltage after rectification).In addition to most subordinate LED subarrays G4, respectively
Normally closed bypass cock (S1, S2 and S3) respectively coupled in parallel in corresponding LED subarrays, and each normally closed bypass cock (S1, S2 and
S3) current detection signal according to corresponding to shuttles in three kinds of on off states respectively：Conducting, regulation and cut-off.Each switch controller
(T10, T20 and T30) be respectively coupled to corresponding to current sense resistor and corresponding bypass cock, as feedback network to control
Three kinds of on off states of normally closed bypass cock.
Rectifier 100 can be but not limited to all-wave (full-wave) or half-wave (half-wave) rectifier.It is each normal
Close bypass cock S1, S2 and S3 and can be, but not limited to enhanced (enhancement-mode) or depletion type (depletion-
Mode) n-channel metal-oxide half field effect transistor (Metal Oxide Semiconductor Field Effect Transistor,
MOSFET) the appropriate switch controller of collocation.Each switch controller T10, T20 and T30 can be but not limited to one with bipolar
Junction transistor (Bipolar Junction Transistor, BJT), shunt regulator (Shunt Regulator, SR) or
Gate drive circuit based on photo-coupler (Photo Coupler, PC), to control the three of normally closed bypass cock kinds of switch shapes
State.For convenience of explanation, each switch controller T10, T20 and T30 in embodiment can have identical reference voltage VREF
To be made comparisons with current detection signal, but it is not limited to the present invention.The current detecting electricity independent of each other according to detected by
Hinder R10, R20 and R30 cross-pressure and reference voltage VREFInstitute's result of the comparison, normally closed bypass cock S1, S2 and S3 are dominated respectively
Three kinds of on off states.The resistance value of current sense resistor middle and lower reaches resistance (R30 ＞ R20 ＞ big compared with the resistance value of upstream resistance
R10), the current sense resistor (not shown) and in normally closed current regulator 120, compared to current sense resistor R10, R20 and
R30, there is minimum resistance value.
It please also refer to Figure 1A and 2.In the first half period, the string ripple input voltage after rectification rises to its peak value by 0.
(0≤vi ＜ V when the input voltage (vi) of rising is still below the LED subarrays G4 of most subordinate forward voltage dropG4), nothing in circuit
Electric current passes through (0≤t ＜ t during the section0) it is commonly referred to as unloaded during.When the input voltage (vi) of rising is enough to overcome most subordinate
LED subarrays G4 forward voltage drop, but still when can not overcome LED subarrays G3 and G4 the forward voltage drop sum of last two level
(VG4≤ vi ＜ VG3+G4), determine normally closed bypass cock S1, electric current inspection that electric current I1 is flowed to the downstream by normally closed current regulator 120
Measuring resistance R10, normally closed bypass cock S2, current sense resistor R20, normally closed bypass cock S3, current sense resistor R30, also,
Electric current I1 is determined by switch controller T30 to be regulated and controled by normally closed bypass cock S3, with t0≤ t ＜ t1During, light LED
Subarray G4.
According to formula I1 × R30=VREF(i.e.), electric current I1 is determined by switch controller T30 to be bypassed
Switch S3 regulation.Default current level is risen above when determining electric current I1Switch controller T30 closes bypass cock
S3 so that determine electric current I1 and drop toDefault current level is decreased below when determining electric current I1Switch controller
T30 conducting bypass cocks S3 so that determine electric current I1 and rise toIn other words, switch controller T30 is by current sense resistor
R30 detects current detection signal (I1 × R30=V up to reference voltageREF) so that bypass cock S3 enters regulation state
(REGULATION state), to adjust by the LED subarrays G4 in downstream electric current to determine electric current I1, this determine electric current I1 by
Resistance detection resistance R30 resistance is presetSwitch controller T10 and T20 are respectively from current sense resistor R10
And R20 detections are less than current detection signal (I1 × R10 ＜ I1 × R20 ＜ V of reference voltageREF) so that normally closed bypass cock S1
And S2 maintains conducting state, with short-circuit LED subarrays G1 and G2.
It can overcome LED subarrays G3 and G4 forward bias voltage drop summation when input resistance (vi) rises to, but be still below LED
Subarray G2, G3 and G4 forward bias voltage drop summation (VG3+G4≤ vi ＜ VG2+G3+G4), in t1≤ t ＜ t2During, determine electric current I2 points
Bright LED subarrays G3 and G4.Switch controller T30 detects the current detecting higher than reference voltage from current sense resistor R30
Signal (I2 × R30 ＞ VREF) so that bypass cock S3 maintains off-state, to ensure that LED subarrays G3 is turned on.According to formula I2
× R20=VREF(that is,), electric current I2 is determined by switch controller T20 to be adjusted by bypass cock S2.Change
Sentence is talked about, and switch controller T20 detects current detection signal (I2 × R20=up to reference voltage from current sense resistor R20
VREF) so that bypass cock S2 enters regulation state, is default using the LED current for adjusting the LED subarrays G3 and G4 that pass through downstream
Determine electric current I2, the resistance for determining electric current I2 according to current sense resistor R20 is presetSwitch controller T10 from
Current detection signal (I2 × R10 ＜ V of the current sense resistor R10 detections less than reference voltageREF) so that bypass cock S1 is tieed up
Conducting state is held, with short-circuit LED subarrays G1.
It can overcome LED subarrays G2, G3 and G4 forward bias voltage drop summation when input resistance (vi) rises to, but be still below
LED subarrays G1, G2, G3 and G4 forward bias voltage drop summation (VG2+G3+G4≤ vi ＜ VG1+G2+G3+G4), in t2≤ t ＜ t3During,
Determine electric current I3 and light LED subarrays G2, G3 and G4.According to formula I3 × R10=VREF(that is,), bypass cock S1
Electric current I3 is determined to adjust by switch controller T10.In other words, switch controller T10 detects from current sense resistor R10
Up to current detection signal (I3 × R10=V of reference voltageREF) so that bypass cock S1 enters regulation state, under being passed through with regulation
LED subarrays G2, G3 and G4 of trip LED current determine electric current I3 to be default, determine electric current I3 according to current sense resistor R10's
Resistance is presetSwitch controller T20 and T30 detect the current detection signal higher than reference voltage respectively
(I3 × R30 ＞ I3 × R20 ＞ VREF) so that bypass cock S2 and S3 maintain off-state, to turn on LED subarrays G2 and G3.
It can overcome all LED subarrays G1, G2, G3 and G4 forward bias voltage drop summation when input resistance (vi) rises to
(VG1+G2+G3+G4≤ vi), near the crest of the string ripple input voltage after rectification, by the current detecting of normally closed current regulator 120
Resistance (not shown) is default to be determined electric current I4 and lights LED subarray G1, G2, G3 and G4 (t3≤ t ＜ t3′).It is foregoing default fixed
Current level is ordered as I4 ＞ I3 ＞ I2 ＞ I1, is that the resistance (R30 ＞ R20 ＞ R10) of foundation current sense resistor is preset
And sort and determine so that the downstream bypass switch of the bypass cock of startup is deactivated.In this way, with the LED light of Alternating Current Power Supply
Engine 10 from bottom to top lights each LED subarrays.
In the second half period, the string ripple input voltage after rectification is by peak-fall to 0.When decline input voltage (vi) still
Higher than LED subarrays G2, G3 and G4 forward drop sum, but the forward voltage less than LED subarrays G1, G2, G3 and G4
Sum (V dropsG2+G3+G4≤ vi ＜ VG1+G2+G3+G4), switch controller T10 reaches reference voltage from current sense resistor R10 detections
Current detection signal (I3 × R10=VREF) so that bypass cock S1 is switched to regulation state, with t3′≤ t ＜ t2′During, adjust
Section determines electric current I3 by LED subarrays G2, G3 and G4 electric current to be default.Switch controller T20 and T30 examine from electric current respectively
Current detection signal (I3 × R30 ＞ I3 × R20 ＞ V of measuring resistance R20 and the R30 detection higher than reference voltageREF) so that bypass
Switch S2 and S3 is remained off, it is ensured that LED subarrays G2 and G3 are turned on.
When the input voltage (vi) of decline remains above LED subarrays G3 and G4 forward drop sum, but it is less than LED
Array G2, G3 and G4 forward drop sum (VG3+G4≤ vi ＜ VG2+G3+G4), switch controller T30 is from current sense resistor
Current detection signal (I2 × R30 ＞ V of the R30 detections more than reference voltageREF), with t2′≤ t ＜ t1′During, open bypass
Close S3 and maintain off-state, to ensure that LED subarrays G3 is turned on.Switch controller T20 reaches ginseng from current sense resistor R20 detections
Examine current detection signal (I2 × R20=V of voltageREF), so that bypass cock S2 enters regulation state, to adjust by LED submatrixs
Row G3 and G4 electric current determines electric current I2 to be default.Switch controller T10 is detected less than with reference to electricity from current sense resistor R10
Current detection signal (I2 × R10 ＜ V of pressureREF) so that normally closed bypass cock S1 returns to conducting state with short-circuit LED subarrays G1.
When the input voltage (vi) of decline remains above LED subarrays G4 forward drop, but less than LED subarrays G3 and
G4 forward drop sum (VG4≤ vi ＜ VG3+G4), switch controller T30 reaches reference from current sense resistor R30 detections
Current detection signal (I1 × R30=V of voltageREF), with t1′≤ t ＜ t0′During, bypass cock S3 is entered regulation state,
Electric current I1 is determined to be default by LED subarrays G4 electric current to adjust.Switch controller T10 and T20 are respectively from current detecting
Current detection signal (I2 × R10 ＜ I2 × R20 ＜ V of resistance R10 and the R20 detection less than reference voltageREF), make normally closed side
Open up pass S1 and S2 and return to conducting state, with short-circuit LED subarrays G1 and G2.In this manner, the LED light engine 10 with Alternating Current Power Supply
Extinguish LED subarrays from top to bottom, until all LED subarrays extinguish.The foregoing institute of LED light engine 10 with Alternating Current Power Supply
Current level quantity is determined in regulation and control, and consideration work that can be between performance and cost is compromise and arbitrarily selected, is converted into bypass and opens
Pass and the quantity of switch controller, with by extracting quasi- string swash current waveform in AC ac line voltages source.
Figure 1B shows the block schematic diagram of lighting device 2 according to an embodiment of the invention, lighting device 2 have with
The LED light engine 20 of Alternating Current Power Supply, it can be used to from top to bottom light the LED subarrays of interspersed setting and from bottom to top extinguish interspersed
The LED subarrays (G0, G1, G2 and G3) of setting.Lighting device 2 include be coupled to AC power AC rectifier 100, with exchange
The LED light engine 20 of power supply and multiple current sense resistor R10 ', R20 ' and R30 ', and the LED of multiple outsides can be equipped with
Subarray G0, G1, G2 and G3.
Rectifier 100 and interspersed LED subarrays (G0, G1, G2 set are coupled to the LED light engine 20 of Alternating Current Power Supply
And G3) between, there is multiple normally closed bypass cocks (S1, S2 and S3), multiple switch controller (T10, T20 and T30) and normally closed
Current regulator 120.In addition to most higher level LED subarrays G0, each normally closed bypass cock (S1, S2 and S3) difference coupled in parallel
In corresponding LED subarrays, and each normally closed bypass cock (S1, S2 and S3) respectively the current detection signal according to corresponding to shuttle in
Three kinds of foregoing on off states.Each switch controller (T10, T20 and T30) be respectively coupled to corresponding to current sense resistor and right
The bypass cock answered, as feedback network to control the three of normally closed bypass cock kinds of on off states.Normally closed current regulator 120 is logical
Cross its low-pressure end and be coupled to ground, to adjust the highest LED current level of the string ripple input voltage peak value after rectification.
Normally closed current regulator 120, normally closed bypass cock S1, S2 and S3 in Figure 1B, and switch controller T10, T20
And T30 can be same or similar with Figure 1A.For convenience of explanation, each switch controller T10, T20 and T30 in embodiment can
With with identical reference voltage VREFTo be made comparisons with current detection signal, but it is not limited to the present invention.Foundation is detected
To current sense resistor R10 ' independent of each other, R20 ' and R30 ' cross-pressure and reference voltage VREFInstitute's result of the comparison, is propped up respectively
Three kinds of on off states with normally closed bypass cock S1, S2 and S3.In the embodiment, the resistance of current sense resistor middle and lower reaches resistance
It is worth (R30'＜ R20'＜ R10') small compared with the resistance value of upstream resistance, and the current sense resistor in normally closed current regulator 120
(not shown), compared to current sense resistor R10 ', R20 ' and R30 ', there is minimum resistance value.
It please also refer to Figure 1B and 2.In the first half period, the string ripple input voltage after rectification rises to its peak value by 0.
(0≤vi ＜ V when the input voltage (vi) of rising is still below the LED subarrays G0 of most higher level forward voltage dropG0), nothing in circuit
Electric current passes through (0≤t ＜ t during the section0) it is commonly referred to as unloaded during.When the input voltage (vi) of rising is enough to overcome most higher level
LED subarrays G0 forward voltage drop, but still before can not overcoming LED the subarrays G0 and G1 of two level forward voltage drop sum (VG0
≤ vi ＜ VG0+G1) when, electric current I1 is determined in t0≤ t ＜ t1During, light LED subarrays G0.
According to formula I1 × R10 '=VREF(i.e.), electric current I1 is determined by switch controller T10 to be bypassed
Switch S1 regulation.In other words, switch controller T10 is detected the electric current inspection up to reference voltage by current sense resistor R10 '
Survey signal (I1 × R10 '=VREF) so that bypass cock S1 enters regulation state, the LED subarrays G0's for passing through upstream with regulation
To determine electric current I1, this determines electric current I1 and preset by resistance detection resistance R10 ' resistance electric currentSwitch control
Device T20 and T30 are less than current detection signal (I1 × R30' of reference voltage from current sense resistor R20 ' and R30 ' detection respectively
＜ I1 × R20'＜ VREF) so that normally closed bypass cock S2 and S3 maintains conducting state, with short-circuit LED subarrays G2 and G3.
It can overcome LED subarrays G0 and G1 forward bias voltage drop summation when input resistance (vi) rises to, but be still below LED
Subarray G0, G1 and G2 forward bias voltage drop summation (VG0+G1≤ vi ＜ VG0+G1+G2), in t1≤ t ＜ t2During, determine electric current I2 points
Bright LED subarrays G0 and G1.Switch controller T10 detects the current detecting higher than reference voltage from current sense resistor R10 '
Signal (I2 × R10'＞ VREF) so that bypass cock S1 maintains off-state, to ensure that LED subarrays G1 is turned on.According to formula I2
× R20 '=VREF(that is,), electric current I2 is determined by switch controller T20 to be adjusted by bypass cock S2.
In other words, switch controller T20 from current sense resistor R20 ' detect up to reference voltage current detection signal (I2 ×
R20 '=VREF) so that bypass cock S2 enters regulation state, to adjust the LED current of LED subarrays G0 and G1 by downstream
Determine electric current I2 to be default, determine electric current I2 and preset by current sense resistor R20 ' resistanceSwitch controller
Current detection signal (I2 × R30'＜ Vs of the T30 from current sense resistor R30 ' detections less than reference voltageREF) so that bypass is opened
Close S3 and maintain conducting state, with short-circuit LED subarrays G3.
It can overcome LED subarrays G0, G1 and G2 forward bias voltage drop summation when input resistance (vi) rises to, but be still below
LED subarrays G0, G1, G2 and G3 forward bias voltage drop summation (VG0+G1+G2≤ vi ＜ VG0+G1+G2+G3), in t2≤ t ＜ t3During,
Determine electric current I3 and light LED subarrays G0, G1 and G2.According to formula I3 × R30 '=VREF(that is,), bypass cock
S3 determines electric current I3 by switch controller T30 to adjust.In other words, switch controller T30 examines from current sense resistor R30 '
Measure the current detection signal (I3 × R30 '=V up to reference voltageREF) so that bypass cock S3 enters regulation state, logical to adjust
LED subarrays G0, G1 and G2 for crossing upstream LED current determine electric current I3 to be default, determine electric current I3 by current sense resistor
R30 ' resistance is presetSwitch controller T10 and T20 detect from current sense resistor R10' and R20' respectively
To current detection signal (I3 × R10'＞ I3 × R20'＞ V higher than reference voltageREF) so that bypass cock S1 and S2 are maintained
Off-state, to turn on LED subarrays G1 and G2.
It can overcome all LED subarrays G0, G1, G2, G3 and G4 forward bias voltage drop when input resistance (vi) rises to
Summation (VG0+G1+G2+G3≤ vi), near the crest of the string ripple input voltage after rectification, by the electric current of normally closed current regulator 120
Detection resistance (not shown) is default to be determined electric current I4 and lights LED subarray G0, G1, G2 and G3 (t3≤ t ＜ t3′).Foregoing determines
Current level is default to be ordered as I4 ＞ I3 ＞ I2 ＞ I1, by the resistance sequence R10'＞ R20'＞ R30' of current sense resistor
Determined, so that the downstream bypass switch of the bypass cock started is deactivated.In this way, with the LED light engine of Alternating Current Power Supply
20 from top to bottom light each LED subarrays.
In the second half period, the string ripple input voltage after rectification is by peak-fall to 0.When decline input voltage (vi) still
Higher than LED subarrays G0, G1 and G2 forward drop sum, but the forward voltage less than LED subarrays G0, G1, G2 and G3
Sum (V dropsG0+G1+G2≤ vi ＜ VG0+G1+G2+G3), switch controller T30 reaches reference voltage from current sense resistor R30 ' detections
Current detection signal (I3 × R30'=VREF) so that bypass cock S3 is switched to regulation state, with t3′≤ t ＜ t2′During,
LED subarrays G0, G1 and G2 that regulation passes through upstream electric current determine electric current I3 to be default.Switch controller T10 and T20 distinguish
Current detection signal (I3 × R10'＞ I3 × R20'＞ from current sense resistor R10 ' and R20 ' detection higher than reference voltage
VREF) so that bypass cock S1 and S2 are remained off, it is ensured that LED subarrays G1 and G2 are turned on.
When the input voltage (vi) of decline remains above LED subarrays G0 and G1 forward drop sum, but it is less than LED
Array G0, G1 and G2 forward drop sum (VG0+G1≤ vi ＜ VG0+G1+G2), switch controller T10 is from current sense resistor
Current detection signal (I2 × R10'＞ V of the R10 ' detections more than reference voltageREF), with t2′≤ t ＜ t1′During, make bypass
Switch S1 and maintain off-state, to ensure that LED subarrays G1 is turned on.Switch controller T20 reaches from current sense resistor R20 ' detections
To current detection signal (I2 × R20'=V of reference voltageREF), so that bypass cock S2 enters regulation state, pass through to adjust
LED subarrays G0 and G1 electric current determine electric current I2 to be default.Switch controller T30 detects low from current sense resistor R30 '
In current detection signal (I2 × R30'＜ V of reference voltageREF) so that normally closed bypass cock S3 returns to conducting state with short-circuit LED
Subarray G3.
When the input voltage (vi) of decline remains above LED subarrays G0 forward drop, but less than LED subarrays G0 and
G1 forward drop sum (VG0≤ vi ＜ VG0+G1), switch controller T10 reaches reference from current sense resistor R10 ' detections
Current detection signal (I1 × R10'=V of voltageREF), with t1′≤ t ＜ t0′During, bypass cock S1 is entered regulation
State, electric current I1 is determined to be default by LED subarrays G0 electric current to adjust.Switch controller T20 and T30 examine from electric current respectively
Current detection signal (I1 × R30'＜ I1 × R20'＜ V of measuring resistance R20 ' and R30 ' detection less than reference voltageREF), make often
The bypass cock S2 and S3 closed returns to conducting state, with short-circuit LED subarrays G2 and G3.
In this manner, LED subarrays are extinguished with the LED light engine 20 of Alternating Current Power Supply from lower to upper, until all LED
Array extinguishes.What the foregoing LED light engine 20 with Alternating Current Power Supply was regulated and controled determines current level quantity, can performance and cost it
Between consideration make compromise and arbitrarily selected, the quantity of bypass cock and switch controller is converted into, with by AC ac line voltages
Quasi- string swash current waveform is extracted in source.
Fig. 1 C show the block schematic diagram of lighting device 3 according to an embodiment of the invention, lighting device 3 have with
The LED light engine 30 of Alternating Current Power Supply, it can be used to from bottom to top light the LED subarrays being arranged in series and from top to bottom extinguish series connection
The LED subarrays (G1, G2, G3 and G4) of setting.Lighting device 3 include be coupled to AC power AC rectifier 100, with exchange
The LED light engine 30 of power supply, and multiple current sense resistor R15, R25 and R35 of series connection, are examined by the multiple electric current respectively
Measuring resistance R15, R25 and R35 high pressure spot e, f and g supply current detection signal, and it is configured with multiple LED subarrays of series connection
G1, G2, G3 and G4.
LED subarrays (G1, G2, G3 that rectifier 100 is coupled to the LED light engine 30 of Alternating Current Power Supply and is arranged in series
And G4) between, there is normally closed current regulator 120, multiple normally closed bypass cocks (S1, S2 and S3) and multiple switch controller
(T15, T25 and T35).Normally closed current regulator 120 is coupled to rectifier 100 by its high-pressure side, to adjust after rectification
String ripple input voltage peak value highest LED current level.In addition to most subordinate LED subarrays G4, each normally closed bypass cock
(S1, S2 and S3) coupled in parallel is in corresponding LED subarrays respectively, and each normally closed bypass cock (S1, S2 and S3) foundation respectively
Corresponding current detection signal shuttles in three kinds of foregoing on off states.Each switch controller (T15, T25 and T35) is respectively coupled to
In corresponding detection tap (sense tap) and corresponding bypass cock, as feedback network to control normally closed bypass cock
Three kinds of on off states.
For convenience of explanation, each switch controller T15, T25 and T35 in embodiment can have identical with reference to electricity
Press VREFTo be made comparisons with current detection signal, according to detected by current sense resistor R15, R15+R25 independent of each other and
R15+R25+R35 cross-pressure (the detection voltage for being respectively corresponding to each detection tap) and reference voltage VREFInstitute's result of the comparison, point
Normally closed bypass cock S1, S2 and S3 three kinds of on off states are not dominated.
It please also refer to Fig. 1 C and 2.In the first half period, the string ripple input voltage after rectification rises to its peak value by 0.
(0≤vi ＜ V when the input voltage (vi) of rising is still below the LED subarrays G4 of most subordinate forward voltage dropG4), nothing in circuit
Electric current passes through (0≤t ＜ t during the section0) it is commonly referred to as unloaded during.When the input voltage (vi) of rising is enough to overcome most subordinate
LED subarrays G4 forward voltage drop, but still when can not overcome LED subarrays G3 and G4 the forward voltage drop sum of last two level
(VG4≤ vi ＜ VG3+G4), electric current I1 is determined in t0≤ t ＜ t1During, light LED subarrays G4.According to formula I1 × (R15+R25
+ R35)=VREF(i.e.), electric current I1 is determined by switch controller T35 and by bypass cock S3
Regulation.That is, switch controller T35 detects the current detection signal up to reference voltage from detection tap g
(I1 × (R15+R25+R35)=VREF) so that bypass cock S3 enters regulation state, to adjust the LED subarrays G4 by downstream
Electric current to determine electric current I1, this is determined electric current I1 and preset by resistance detection resistance R15, R25 and R35 resistanceSwitch controller T15 and T25 are less than the electricity of reference voltage from detection tap e and f detection respectively
Flow detection signal (I1 × R15 ＜ I1 × (R15+R25) ＜ VREF) so that normally closed bypass cock S1 and S2 maintains conducting state,
With short-circuit LED subarrays G1 and G2.
It can overcome LED subarrays G3 and G4 forward bias voltage drop summation when input resistance (vi) rises to, but be still below LED
Subarray G2, G3 and G4 forward bias voltage drop summation (VG3+G4≤ vi ＜ VG2+G3+G4), in t1≤ t ＜ t2During, determine electric current I2 points
Bright LED subarrays G3 and G4.Switch controller T35 detects the current detection signal (I2 higher than reference voltage from detection tap g
× (R15+R25+R35) ＞ VREF) so that bypass cock S3 maintains off-state, to ensure that LED subarrays G3 is turned on.According to formula
I2 × (R15+R25)=VREF(that is,), electric current I2 is determined by switch controller T25 to be opened by bypass
Close S2 regulation.In other words, switch controller T25 detects the current detection signal (I2 up to reference voltage from detection tap f
× (R15+R25)=VREF) so that bypass cock S2 enters regulation state, LED the subarrays G3's and G4 for passing through downstream with regulation
LED current determines electric current I2 to be default, determines electric current I2 by current sense resistor R15 and R25 resistance and presetsSwitch controller T15 from detection tap e detection less than reference voltage current detection signal (I2 ×
R15 ＜ VREF) so that bypass cock S1 maintains conducting state, with short-circuit LED subarrays G1.
It can overcome LED subarrays G2, G3 and G4 forward bias voltage drop summation when input resistance (vi) rises to, but be still below
LED subarrays G1, G2, G3 and G4 forward bias voltage drop summation (VG2+G3+G4≤ vi ＜ VG1+G2+G3+G4), in t2≤ t ＜ t3During,
Determine electric current I3 and light LED subarrays G2, G3 and G4.According to formula I3 × R15=VREF(that is,), bypass cock S1
Electric current I3 is determined to adjust by switch controller T15.In other words, switch controller T15 is detected up to reference from detection tap e
Current detection signal (I3 × R15=V of voltageREF) so that bypass cock S1 enters regulation state, to adjust the LED by downstream
Subarray G2, G3 and G4 LED current determine electric current I3 to be default, and it is pre- by current sense resistor R15 resistance institute to determine electric current I3
IfSwitch controller T25 and T35 detect the current detection signal (I3 × (R15+ higher than reference voltage respectively
R25+R35) ＞ I3 × (R15+R25) ＞ VREF) so that bypass cock S2 and S3 maintain off-state, to turn on LED subarrays G2
And G3.
It can overcome all LED subarrays G1, G2, G3 and G4 forward bias voltage drop summation when input resistance (vi) rises to
(VG1+G2+G3+G4≤ vi), near the crest of the string ripple input voltage after rectification, by the current detecting of normally closed current regulator 120
Resistance (not shown) is default to be determined electric current I4 and lights LED subarray G1, G2, G3 and G4 (t3≤ t ＜ t3′).Foregoing determines electric current
Level is default to be ordered as I4 ＞ I3 ＞ I2 ＞ I1, so that the bypass cock started disables downstream bypass switch.In this manner,
Each LED subarrays are from bottom to top lighted with the LED light engine 30 of Alternating Current Power Supply.
In the second half period, the string ripple input voltage after rectification is by peak-fall to 0.When decline input voltage (vi) still
Higher than LED subarrays G2, G3 and G4 forward drop sum, but the forward voltage less than LED subarrays G1, G2, G3 and G4
Sum (V dropsG2+G3+G4≤ vi ＜ VG1+G2+G3+G4), switch controller T15 reaches the electric current of reference voltage from detection tap e detections
Detection signal (I3 × R15=VREF) so that bypass cock S1 is switched to regulation state, with t3′≤ t ＜ t2′During, regulation passes through
LED subarrays G2, G3 and G4 electric current determine electric current I3 to be default.Switch controller T25 and T35 respectively from detection tap f and
Detect current detection signal (I3 × (R15+R25+R35) ＞ I3 × (R15+R25) ＞ of the tap g detections higher than reference voltage
VREF) so that bypass cock S2 and S3 are remained off, it is ensured that LED subarrays G2 and G3 are turned on.
When the input voltage (vi) of decline remains above LED subarrays G3 and G4 forward drop sum, but it is less than LED
Array G2, G3 and G4 forward drop sum (VG3+G4≤ vi ＜ VG2+G3+G4), switch controller T35 detects from detection tap g
To the current detection signal (I2 × (R15+R25+R35) ＞ V more than reference voltageREF), with t2′≤ t ＜ t1′During, make
Bypass cock S3 maintains off-state, to ensure that LED subarrays G3 is turned on.Switch controller T25 reaches ginseng from detection tap f detections
Examine the current detection signal (I2 × (R15+R25)=V of voltageREF), so that bypass cock S2 enters regulation state, pass through to adjust
LED subarrays G3 and G4 electric current determine electric current I2 to be default.Switch controller T15 is detected less than reference from detection tap e
Current detection signal (I2 × R15 ＜ V of voltageREF) so that normally closed bypass cock S1 returns to conducting state with short-circuit LED subarrays
G1。
When the input voltage (vi) of decline remains above LED subarrays G4 forward drop, but less than LED subarrays G3 and
G4 forward drop sum (VG4≤ vi ＜ VG3+G4), switch controller T35 reaches the electric current of reference voltage from tap g detections
Detection signal (I1 × (R15+R25+R35)=VREF), with t1′≤ t ＜ t0′During, bypass cock S3 is entered regulation state,
Electric current I1 is determined to be default by LED subarrays G4 electric current to adjust.Switch controller T15 and T25 are respectively from detection tap e
And detection tap f detections are less than current detection signal (I1 × R15 ＜ I1 × (R15+R25) ＜ V of reference voltageREF), make normally closed
Bypass cock S1 and S2 return to conducting state, with short-circuit LED subarrays G1 and G2.
In this manner, LED subarrays are extinguished with the LED light engine 30 of Alternating Current Power Supply from top to bottom, until all LED
Array extinguishes.What the foregoing LED light engine 30 with Alternating Current Power Supply was regulated and controled determines current level quantity, can performance and cost it
Between consideration make compromise and arbitrarily selected, the quantity of bypass cock and switch controller is converted into, with by AC ac line voltages
Quasi- string swash current waveform is extracted in source.
Those skilled in the art of the present invention, can be according to Fig. 1 C by the similitude and symmetry between Figure 1B and Figure 1A
Symmetrical structure is built up, in a manner of lighting from top to bottom and extinguish LED subarrays from lower to upper, recombinates most subordinate LED
Array G4 is most higher level LED subarrays, and recombinates the annexation of switch controller and its corresponding bypass cock, that is, will
The corresponding relation of (switch controller, bypass cock) be (T35, S3), (T25, S2) and (T15, S1) be reassembled as (T35, S1),
(T25, S2) and (T15, S3).
Fig. 1 D show the block schematic diagram of lighting device 4 according to an embodiment of the invention, lighting device 4 have with
The LED light engine 40 of Alternating Current Power Supply, it can be used to from bottom to top light the LED subarrays being arranged in series and from top to bottom extinguish series connection
The LED subarrays (G1, G2, G3 and G4) of setting.Lighting device 4 include be coupled to AC power AC rectifier 100, with exchange
The LED light engine 40 of power supply, and multiple current sense resistor R5, R15, R25 and R35 of series connection, respectively by the multiple electricity
Detection resistance R5, R15, R25 and R35 high pressure spot e ', f ', g ' and h ' supply current detection signals are flowed, and is equipped with series connection
LED subarrays G1, G2, G3 and G4 of multiple outsides.
LED subarrays (G1, G2, G3 that rectifier 100 is coupled to the LED light engine 40 of Alternating Current Power Supply and is arranged in series
And G4) between, there is normally closed current regulating switch S0, multiple normally closed bypass cocks (S1, S2 and S3) and multiple switch controller
(T5, T15, T25 and T35).Normally closed current regulating switch S0 is coupled to rectifier 100 by switch controller by its high-pressure side
T5 regulation and control, to adjust the highest LED current level of the string ripple input voltage peak value after rectification.Except most subordinate LED
Beyond array G4, coupled in parallel is in corresponding LED subarrays respectively for each normally closed bypass cock (S1, S2 and S3), and each normally closed side
Opening up pass (S1, S2 and S3), the current detection signal according to corresponding to shuttles in three kinds of foregoing on off states respectively.Each switch control
Device (T15, T25 and T35) processed detects tap (tap) and corresponding bypass cock corresponding to being respectively coupled to, as feedback network
To control the three of normally closed bypass cock kinds of on off states.The normally closed current regulating switch S0 regulated and controled by switch controller T5, can
Substitute the current regulator in other embodiment.
For convenience of explanation, each switch controller T5, T15, T25 and T35 in embodiment can have identical ginseng
Examine voltage VREFTo be made comparisons with current detection signal, according to detected by current sense resistor R5, R5+R15 independent of each other,
R5+R15+R25 and R5+R15+R25+R35 cross-pressure (the detection voltage for being respectively corresponding to each detection tap e ', f ', g ' and h ')
With reference voltage VREFInstitute's result of the comparison, normally closed current regulating switch S0 is dominated respectively, normally closed bypass cock S1, S2 and S3's
Three kinds of on off states.
Shown in Fig. 1 D with shown in the operation principle similar in appearance to Fig. 1 C of the LED light engine 40 of Alternating Current Power Supply with Alternating Current Power Supply
LED light engine 30 operation principle.Major difference is that being used with the LED light engine 30 of Alternating Current Power Supply shown in Fig. 1 C
Uncontrolled current regulator 120 adjusts highest LED current level.Relatively, the LED with Alternating Current Power Supply shown in Fig. 1 D
Light engine 40 adjusts highest LED current level using controlled current regulator S0.Therefore, supplied shown in Fig. 1 D with exchanging
The detailed operation principle of the LED light engine 40 of electricity is self-evident, and here is omitted.The people in the art of the present invention
Member, can build up symmetrical structure according to Fig. 1 D, in a manner of lighting from top to bottom and extinguish LED subarrays from lower to upper, weight
Zu subordinates LED subarrays G4 is most higher level LED subarrays, and recombinates the connection of switch controller and its corresponding bypass cock
Relation, that is, the corresponding relation of (switch controller, bypass cock) is recombinated for (T35, S3), (T25, S2) and (T15, S1)
For (T35, S1), (T25, S2) and (T15, S3).
Drawing with the LED light of Alternating Current Power Supply according to Figure 1A and Fig. 1 C different embodiments of the invention is shown respectively in Fig. 3 A and 3B
The integrated circuit held up.Fig. 3 A are refer to, integrated circuit 12 has 9 pins (being respectively pin A, D, E, F, G, H, I, J and K),
Four interspersed bypass cock S0, S1, S2 and S3 set, and four switch controllers T0, T10, T20 and T30.In the embodiment
In, current sense resistor Rx, R10, R20 and R30 are located at the outside of integrated circuit 12 so that designer, which can program, determines electric current electricity
It is flat.In other embodiment, can also built-in fixation current sense resistor Rx, R10, R20 and R30 in integrated circuit 12
Portion, to reduce the component number of integrated circuit.
The pin A of integrated circuit 12 is coupled to rectifier 100 and current regulating switch S0 high level level terminal；Pin D
It is coupled to current sense resistor R30 low level end (LED subarrays G4 anode) and switch controller T30 low level
End；Pin E is coupled to current sense resistor R30 high level end (LED subarrays G3 negative electrode) and bypass cock S3's is low
Level terminal (switch controller T30 reference edge)；Pin F coupling current sense resistors R20 low level end (LED subarrays G3
Anode) and bypass cock S3 high level end (switch controller T20 low level end)；Pin G is coupled to current detecting electricity
Hinder R20 high level end (LED subarrays G2 negative electrode) and bypass cock S2 low level end (switch controller T20 ginseng
Examine end)；Pin H is coupled to current sense resistor R10 low level end (LED subarrays G2 anode) and bypass cock S2
High level end (switch controller T10 low level end)；Pin I is coupled to current sense resistor R10 high level end (LED
Array G1 negative electrode) and bypass cock S1 low level end (switch controller T10 reference edge)；Pin J is coupled to electric current
Detection resistance Rx low level end (LED subarrays G1 anode) and bypass cock S1 high level end (switch controller T10
Low level end)；And pin K is coupled to current sense resistor Rx high level end and bypass cock S0 low level end (is opened
Gateway controller T10 reference edge).
Refer to Fig. 3 B, integrated circuit 22 has 10 pins (being respectively pin A, N, O, P, Q, S, T, U, V and W), and four
Bypass cock S0, S1, S2 and S3 of individual interspersed setting, and four switch controllers T0, T15, T25 and T35.In the embodiment
In, current sense resistor Rx, R35, R25 and R15 are located at the outside of integrated circuit 22 so that designer, which can program, determines electric current electricity
It is flat.In other embodiment, can also built-in fixation current sense resistor Rx, R35, R25 and R15 in integrated circuit 22
Portion, to reduce the component number of integrated circuit.
The pin A of integrated circuit 22 is coupled to rectifier 100 and current regulating switch S0 high level end；Pin N is coupled
In divider resistance R1 low level end (divider resistance R2 high level end) and switch controller T15, T25 and T35 low electricity
Flush end；Pin O is coupled to current sense resistor R35 high level end (LED subarrays G4 negative electrode) and switch controller T35
Reference edge (switch controller T30 reference edge)；Pin P coupling current sense resistors R35 low level end (current detecting electricity
Hinder R25 high level end) and current regulator T25 reference edge；Pin Q is coupled to current sense resistor R25 low level end
(current sense resistor R15 high level end) and switch controller T15 reference edge；Pin S is coupled to LED subarrays G4's
The low level end of anode (LED subarrays G3 negative electrode) and bypass cock S3；Pin T is coupled to LED subarrays G3 anode
(LED subarrays G2 negative electrode) and bypass cock S2 low level end (bypass cock S3 high level end)；Pin U is coupled to
LED subarrays G2 anode (LED subarrays G1 negative electrode) and bypass cock S2 high level end (bypass cock S1 low electricity
Flush end)；Pin V is coupled to current sense resistor Rx low level end (LED subarrays G1 anode) and bypass cock S1
High level end (switch controller T0 low level end)；And pin W is coupled to current sense resistor Rx high level end and electricity
Flow detection switch S0 low level end (switch controller T0 reference edge).
Fig. 4 shows the block schematic diagram of the lighting device 5 according to Figure 1A of the present invention embodiment, and it is included with Alternating Current Power Supply
LED light engine 50.Lighting device 5 includes being coupled to AC power AC rectifier 100, the LED light with Alternating Current Power Supply
Engine 50, multiple LED subarrays G1, G2 ... Gn-1 and Gn, and multiple current sense resistor R10, R20 ... Rn-1 and Rn.Electricity
It is big (Rn ＞ Rn-1 ＞ ... ＞ R20 ＞ R10) compared with the resistance value of upstream resistance to flow the resistance value of detection resistance middle and lower reaches resistance, and
Current sense resistor Rd in normally closed current regulator 120, compared to current sense resistor Rn, Rn-1 ... R20 and R10, have
Minimum resistance value.Normally closed current regulator 120, multiple normally closed bypass cocks are included with the LED light engine 50 of Alternating Current Power Supply
(S1, S2 ... Sn-1 and Sn) and multiple switch controller (T10, T20 ... Tn-1 and Tn).Except most subordinate LED subarrays Gn+1
In addition, coupled in parallel is in corresponding LED subarrays respectively for each normally closed bypass cock (S1, S2 ... Sn-1 and Sn), and each normally closed side
Opening up pass (S1, S2 ... Sn-1 and Sn), the current detection signal according to corresponding to shuttles in three kinds of on off states respectively：Conducting, regulation
And cut-off.Each switch controller (T10, T20 ... Tn-1 and Tn) is respectively coupled to corresponding current sense resistor and corresponding side
Pass is opened up, as feedback network to control the three of normally closed bypass cock kinds of on off states.Each normally closed bypass cock (S1, S2 ...
Sn-1 and Sn) it is enhanced n-channel metal-oxide half field effect transistor (MOSFET) and appropriate switch controller of arranging in pairs or groups.Each switch control
Device (T10, T20 ... Tn-1 and Tn) processed be one with bipolar junction transistor (Bipolar Junction Transistor,
BJT the gate drive circuit based on), including to turn on bypass cock (S1, S2 ... Sn-1 and Sn) gate pole charging resistor
It is (Ra1, Ra2 ... Ran-1 and Ran) and brilliant compared with dipole to end the voltage ratio of bypass cock (S1, S2 ... Sn-1 and Sn)
Body pipe BJT (B1, B2 ... Bn-1 and Bn), use three kinds of on off states for controlling normally closed bypass cock.
In the embodiment, normally closed current regulator 120 includes current regulating switch M (enhanced n-channel MOSFETs
Transistor), gate pole charging resistor Ra, voltage ratio is compared with bipolar junction transistor B and current sense resistor Rd.Current regulating switch M
With gate pole, drain electrode and source electrode, its coupling rectifier 100 (gate pole charging resistor Ra high level end) that drains, the coupling of its gate pole
Gate pole charging resistor Ra low level end (collector of the voltage ratio compared with bipolar junction transistor), and its source electrode coupling current detecting electricity
Hinder Rd high level end (base stage of the voltage ratio compared with bipolar junction transistor B).
Will be described below how making enhanced n-channel metal-oxide half field effect transistor be converted to normally closed switch.When lighting device 5
After random power conducting, in original state, the string ripple input voltage after rectification is risen to enough along LED of Pian subordinates
Inside array Gn+1, current regulating switch M and lock source capacitance that bypass cock S1, S2...Sn-1 and Sn are all can lead to
Corresponding gate pole charging resistor is crossed, while charges to its threshold voltage level, uses and turns on its passage.
Compare the voltage V put between lock source electrodeGSAnd positive threshold voltage Vth, end in corresponding current detection signal
Corresponding voltage ratio is compared with bipolar junction transistor so that the lock source capacitance in enhanced n-channel metal-oxide half field effect transistor is led to
Corresponding gate pole charging resistor charging is crossed, and operates in conducting state (VGS＞ Vth)；Switch in corresponding current detection signal corresponding
Voltage ratio compared with bipolar junction transistor between the state ended and turned on so that enhanced n-channel metal-oxide half field effect transistor
Interior lock source capacitance is charged by corresponding gate pole charging resistor, and by corresponding voltage ratio compared with bipolar junction transistor B
Electric discharge, and operate in regulation state (VGS=Vth)；It is brilliant compared with dipole in voltage ratio corresponding to the conducting of corresponding current detection signal
Body pipe so that the lock source capacitance in enhanced n-channel metal-oxide half field effect transistor is by corresponding voltage ratio compared with dipole
Transistor B discharges, and operates in off-state (VGS＜ Vth)。
Fig. 5 shows the block schematic diagram of the lighting device 6 according to the embodiment according to Fig. 1 C of the present invention, and it is included to exchange
The LED light engine 60 of power supply.Lighting device 6 includes being coupled to AC power AC rectifier 100, with Alternating Current Power Supply
LED light engine 60, multiple LED subarrays G1, G2, G3 and G4, and multiple current sense resistor R15, R25 and R35 of series connection,
There is detection tap e, detection tap f and detection tap g respectively in current sense resistor R15, R25 and R35 high level end, use
To provide current detection signal.With the LED light engine 60 of Alternating Current Power Supply include normally closed current regulator 120 ', series connection it is multiple often
Close bypass cock (S1, S2 and S3) and multiple switch controller (T15, T25 and T35).Except most subordinate LED subarrays G4 with
Outside, each normally closed bypass cock (S1, S2 and S3) respectively coupled in parallel in corresponding detection tap, and each normally closed bypass cock (S1,
S2 and S3) respectively according to corresponding to current detection signal shuttle in three kinds of foregoing on off states.Each switch controller (T15,
T25 and T35) be respectively coupled to corresponding to detection tap and corresponding bypass cock, as feedback network to control normally closed bypass
Three kinds of on off states of switch.Each normally closed bypass cock (S1, S2 and S3) is depletion type n-channel metal-oxide half field effect transistor
And appropriate switch controller of arranging in pairs or groups (MOSFET).Each switch controller (T15, T25 and T35) in Fig. 1 C is for one with bipolar
Gate drive circuit based on junction transistor (Bipolar Junction Transistor, BJT), including to turn on side
Open up pass (S1, S2 and S3) gate pole discharge resistance (Rz1, Rz2, and Rz3) and to end bypass cock (S1, S2 and
S3 voltage ratio) compared with bipolar junction transistor BJT (B1, B2 and B3), it is anti-clamp (anti-clamping) resistance (Rb1, Rb2 and
Rb3), divider resistance (Rg1, Rg2 and Rg3) and voltage clamping Zener diode (Z1, Z2 and Z3), the normally closed bypass of control is used
Three kinds of on off states of switch.Divider includes the divider resistance R1 and R2 being serially connected, to sample scaled down rectification
String ripple input voltage afterwardsThe value is added into voltage ratio compared with bipolar junction transistor B1, B2 and B3 emitter-base bandgap grading, made
Obtain current detection signal and string ripple adjustment voltageMake comparisons, rather than with fixed reference voltage VREFMake ratio
Compared with using softening grading current waveform as a closer sinusoidal waveform so that lighting device can have more preferable power factor
And lower total harmonic distortion (THD) (PF).
In the embodiment, normally closed current regulator 120 ' includes current regulating switch M (enhanced n-channel MOS fields
Imitate transistor), gate pole charging resistor Ra, shunt regulator X and current sense resistor Rx.Current regulating switch M has gate pole, leakage
Pole and source electrode, its coupling rectifier 100 (gate pole charging resistor Ra high level end) that drains, its gate pole coupling gate pole charging resistor
Ra low level end (shunt regulator X negative electrode), and its source electrode coupling current sense resistor Rx high level end (parallel connection regulation
Device X reference edge).
It is apparent that depletion type n-channel metal-oxide half field effect transistor is normally closed switch.The random power connection of lighting device 6
Afterwards, only current regulating switch M needs to be initialised, and turns into normally closed switch.It can be led to by understanding enhanced n in Fig. 4 explanation
The initialization flow of road metal-oxide half field effect transistor, therefore will not be described in great detail in Fig. 5.Compare the voltage V put between lock source electrodeGS
And negative threshold voltage Vth.When voltage ratio corresponding to the corresponding current detection signal cut-off less than reference value is brilliant compared with dipole
Body pipe so that the lock source capacitance in depletion type n-channel metal-oxide half field effect transistor is discharged by corresponding gate pole discharge resistance,
And operate in conducting state (VGS＞ Vth)；Voltage ratio corresponding to switching in the corresponding current detection signal for reaching reference value is more double
Pole junction transistor is between the state ended and turned on so that the lock source electrode electricity in depletion type n-channel metal-oxide half field effect transistor
Hold and charged by corresponding gate pole charging resistor, and by corresponding gate pole discharge resistance, corresponding voltage ratio compared with dipole
Transistor, corresponding anti-clamp resistance, corresponding divider resistance, and the electric discharge of corresponding voltage clamping Zener diode, and grasp
Make in regulation state (VGS=Vth)；In voltage ratio corresponding to the corresponding current detection signal conducting higher than reference value compared with bipolar junction
During transistor npn npn so that the lock source capacitance in depletion type n-channel metal-oxide half field effect transistor is more double by corresponding voltage ratio
Pole junction transistor, corresponding anti-clamp resistance, corresponding divider resistance and corresponding voltage clamping Zener diode fill
Electricity so that depletion type n-channel metal-oxide half field effect transistor operates in off-state (VGS＜ Vth).Accordingly, all normally closed bypass are opened
Closing S1, S2 and S3 will shuttle in three kinds of on off states, and normally closed current regulating switch M only shuttles in conducting and regulation state, will not
Operate in off-state.
Fig. 6 shows the block schematic diagram of the lighting device 7 according to the embodiment according to Fig. 1 C of the present invention, and it is included to exchange
The LED light engine 70 of power supply.Lighting device 7 includes being coupled to AC power AC rectifier 100, with Alternating Current Power Supply
LED light engine 70, multiple LED subarrays G1, G2, G3 and G4, and multiple current sense resistor R15, R25 and R35 of series connection,
There is detection tap e, detection tap f and detection tap g respectively in current sense resistor R15, R25 and R35 high level end, use
To provide current detection signal.With the LED light engine 70 of Alternating Current Power Supply include normally closed current regulator 120 ', series connection it is multiple often
Close bypass cock (S1, S2 and S3) and multiple switch controller (T15, T25 and T35).Except most subordinate LED subarrays G4 with
Outside, each normally closed bypass cock (S1, S2 and S3) respectively coupled in parallel in corresponding detection tap, and each normally closed bypass cock (S1,
S2 and S3) respectively according to corresponding to current detection signal shuttle in three kinds of foregoing on off states.Each switch controller (T15,
T25 and T35) be respectively coupled to corresponding to detection tap and corresponding bypass cock, as feedback network to control normally closed bypass
Three kinds of on off states of switch.
Fig. 6 normally closed current regulator 120 ' is identical with Fig. 5 normally closed current regulator 120 ', and here is omitted.Respectively
Individual normally closed bypass cock (S1, S2 and S3) is that enhanced n-channel metal-oxide half field effect transistor (turns into normally closed to open after initialization
Close) and appropriate switch controller of arranging in pairs or groups.Each switch controller T15, T25 and T35 (being illustrated in Fig. 1 C) are one with bipolar junction
Gate drive circuit based on transistor npn npn (BJT), including to turn on the gate pole of corresponding bypass cock (S1, S2 and S3)
Charging resistor (Ra1, Ra2 and Ra3) and determine voltage regulator 180,182 and 184, and to end corresponding bypass cock
The voltage ratio of (S1, S2 and S3) is compared with bipolar junction transistor BJT (B1, B2 and B3), anti-clamp (anti-clamping) resistance
(Rb1, Rb2 and Rb3), current-limiting resistance (Rd1, Rd2 and Rd3) and gate pole discharge diode (D1, D2 and D3), it is normal to use control
Close three kinds of on off states of bypass cock.Divider includes the divider resistance R1 and R2 being serially connected, to sample diminution ratio
Rectification after string ripple input voltageThe value is added into voltage ratio penetrating compared with bipolar junction transistor B1, B2 and B3
Pole so that current detection signal and string ripple adjustment voltageMake comparisons, rather than with fixed reference voltage
VREFMake comparisons, using softening grading current waveform as a closer sinusoidal waveform so that lighting device there can be more preferable work(
Rate factor (PF) and lower total harmonic distortion (THD).In addition, interference defence diode (D5, D6 and D7) is further included, to
LED subarrays G2, G3 and G4 operation corresponding to preventing are by unexpected interference superposition in voltage ratio compared with bipolar junction transistor
Pipe B1, B2 and B3 emitter-base bandgap grading are influenceed, and make corresponding gate pole discharge diode (D1, D2 and D3) conducting, with other corresponding to closing
Open up and close S1, S2 and S3.
It is each to determine voltage regulator 180,182 and 184 and include voltage-regulation bipolar junction transistor in the embodiment
(B7, B8 and B9), current-limiting resistance (Rv1, Rv2 and Rv3), voltage clamping Zener diode (Z4, Z5 and Z6) and ceramic condenser
(C1, C2 and C3).Voltage-regulation bipolar junction transistor (B7, B8 and B9) has base stage, emitter-base bandgap grading and collector, the coupling pair of its base stage
Low level end (the moon of corresponding voltage clamping Zener diode (Z4, Z5 and Z6) for the current-limiting resistance (Rv1, Rv2 and Rv3) answered
Pole), and ceramic condenser (C1, C2 and C3) corresponding to the coupling of its emitter-base bandgap grading high level end (corresponding gate pole charging resistor (Ra1,
Ra2 and Ra3) high level end), and its collector coupling corresponding to current-limiting resistance (Rv1, Rv2 and Rv3) high level end.Yu Wen
State (steady state), the voltage across each ceramic condenser (C1, C2 and C3) will be according to formula VC=VZ-VBE(wherein, VC、VZ
And VBEThe respectively cut-in voltage of capacitance voltage, Zener breakdown voltage and bipolar junction transistor), and it is double by voltage-regulation
The regulation and control of pole junction transistor (B7, B8 and B9).As capacitance voltage VCRise above preset reset voltage level (VZ-VBE) when, it is right
The voltage-regulation bipolar junction transistor cut-off answered so that corresponding bypass cock cut-off.As capacitance voltage VCIt is decreased below
Preset reset voltage level (VZ-VBE) when, corresponding voltage-regulation bipolar junction transistor conducting so that corresponding bypass cock is led
It is logical.The function for determining voltage regulator is to store the both ends that certain voltage is across corresponding ceramic condenser so that corresponding
The inside lock source electric capacity of enhanced n-channel metal-oxide half field effect transistor can be charged to certain voltage, without by after rectification
The rising edge or falling edge of string ripple input voltage waveform are influenceed so that the shape of the current waveform of the second half period it is more symmetrical in
The shape of the current waveform of first half period.Determine voltage regulator to can apply in the foregoing embodiment of the present invention, use increasing
Any embodiment of the strong type n-channel metal-oxide half field effect transistor as normally closed bypass cock.
Compare the voltage V put between lock source electrodeGSAnd positive threshold voltage Vth.When the corresponding electric current less than reference value
Voltage ratio is compared with bipolar junction transistor corresponding to detection signal cut-off so that in enhanced n-channel metal-oxide half field effect transistor
Lock source capacitance by corresponding gate pole charging resistor and it is corresponding determine voltage regulator and charge, and operate in conducting state (VGS
＞ Vth)；Voltage ratio corresponding to switching when the corresponding current detection signal for reaching reference value is compared with bipolar junction transistor in cut-off
And between the state of conducting so that the lock source capacitance in enhanced n-channel metal-oxide half field effect transistor is filled by corresponding gate pole
Resistance and it is corresponding determine voltage regulator charging, and by corresponding voltage ratio compared with bipolar junction transistor, corresponding anti-pincers
Position resistance, corresponding current-limiting resistance and the electric discharge of corresponding gate pole discharge diode, and operate in regulation state (VGS=Vth)；When
Higher than reference value corresponding current detection signal conducting corresponding to voltage ratio compared with bipolar junction transistor when, enhanced n-channel
Lock source capacitance in metal-oxide half field effect transistor is by corresponding voltage ratio compared with bipolar junction transistor, corresponding anti-clamp electricity
Resistance, corresponding current-limiting resistance and corresponding gate pole discharge diode discharge so that enhanced n-channel MOSFET crystal
Pipe operates in off-state (VGS＜ Vth).Accordingly, all normally closed bypass cock S1, S2 and S3 will shuttle in three kinds of on off states,
And normally closed current regulating switch M only shuttles in conducting and regulation state, off-state will not be operated in.
Fig. 7 is shown according to being equipped with the lighting device 8 of the LED light engine 80 of Alternating Current Power Supply according to Fig. 1 D of the present invention
Block schematic diagram.Lighting device 8 includes being coupled to AC power AC rectifier 100, the LED light engine with Alternating Current Power Supply
80th, multiple LED subarrays G1, G2, G3 and G4, and multiple current sense resistor R5, R15, R25 and R35 of series connection, in electric current
Detection resistance R5, R15, R25 and R35 high level end have detection tap e ', detection tap f ', detection tap g ' and inspection respectively
Tap h ' is surveyed, to provide current detection signal.With the LED light engine 80 of Alternating Current Power Supply include normally closed current regulating switch S0,
Multiple normally closed bypass cocks (S1, S2 and S3) of series connection and multiple switch controller (T5, T15, T25 and T35).Except most subordinate
Beyond LED subarrays G4, each normally closed bypass cock (S1, S2 and S3) respectively coupled in parallel in corresponding detection tap, and it is each often
Closing bypass cock (S1, S2 and S3), the current detection signal according to corresponding to shuttles in three kinds of foregoing on off states respectively.Respectively open
Gateway controller (T15, T25 and T35) detects tap and corresponding bypass cock corresponding to being respectively coupled to, and switch controller T5 is then
Detection tap and normally closed current regulating switch S0 corresponding to being coupled to, as feedback network to control the three of normally closed bypass cock kinds
On off state.
Fig. 7 normally closed current regulating switch S0 and normally closed bypass cock S1, S2 and S3 are all enhanced n-channel MOS field
Transistor (turn into normally closed switch after initialization) is imitated, and appropriate switch controller of arranging in pairs or groups operates.Each switch controller T5,
T15, T25 and T35 (being illustrated in Fig. 1 D) are the gate drive circuit based on a photo-coupler (Photo Coupler, PC), are wrapped
The gate pole charging resistor of current regulating switch S0 and bypass cock (S1, S2 and S3) corresponding to including to turn on (Ra0, Ra1,
Ra2 and Ra3), and to end photo-coupler PC0, PC1, PC2 and PC3 of corresponding bypass cock (S1, S2 and S3) and
Anti- clamp (anti-clamping) resistance (Rb0, Rb1, Rb2 and Rb3), use three kinds of switch shapes of the normally closed bypass cock of control
State.Each photo-coupler PC0, PC1, PC2 and PC3 include voltage ratio compared with optical diode (PD0, PD1, PD2 and PD3) and corresponding door
Pole electric discharge optotransistor (PT0, PT1, PT2 and PT3).
Divider includes the divider resistance R1 and R2 being serially connected, to sample the input of the string ripple after scaled down rectification
VoltageThe value is added to optical diode PD0, PD1, PD3 and PD4 negative electrode so that current detection signal and string ripple
Adjust voltageMake comparisons, rather than with fixed reference voltage VREFMake comparisons, with softening grading current ripple
Shape is a closer sinusoidal waveform so that lighting device can have more preferable power factor (PF) and lower total harmonic wave
Distortion (THD).In the embodiment, flicker suppresses electric capacity (Cg1, Cg2, Cg3 and Cg4), and coupled in parallel is in corresponding LED submatrixs
Row, using the accessory power supply as supply LED current.Corresponding electric current retain (retaining) diode (D8, D9, D10 and
D11 it is normally closed corresponding to) being coupled to open up pass and corresponding flicker suppression electric capacity, to prevent capacitance charge by unexpected
Circuit element consumes, rather than is consumed by corresponding LED subarrays, and can improve flashing state without damaging high work(
Rate factor and low total harmonic distortion, because each flicker suppresses electric capacity and can only charge to the forward electric of corresponding LED subarrays
Pressure drop, go to overcome by the string ripple input voltage after rectification without manufacturing a higher potential barrier.Foregoing flicker suppresses
Electric capacity be can be applied in any embodiment of the present invention, also, it can be realized with a life-span shorter electrochemical capacitor, or preferably
Ground, reciprocity reality is come with the M × N matrix non-electrolytic capacitor (being, for example, ceramic condenser, tantalum matter electric capacity or solid capacitor) lasted a long time
Existing, wherein M is the number of row (row), and N is the number of row (column), and the rwo has with voltagerating and current rating respectively
Close.
Compare the voltage V put between lock source electrodeGSAnd positive threshold voltage Vth.When the corresponding electric current less than reference value
Optical diode corresponding to detection signal cut-off so that the lock source capacitance in enhanced n-channel metal-oxide half field effect transistor passes through
Corresponding gate pole charging resistor charges and operates in conducting state (VGS＞ Vth)；When the corresponding current detecting for reaching reference value is believed
Number voltage ratio corresponding to switching is compared with optical diode between the state ended and turned on so that enhanced n-channel MOSFET is brilliant
Lock source capacitance in body pipe is charged by corresponding gate pole charging resistor, and passes through corresponding photo-coupler and corresponding anti-pincers
Position conductive discharge, and operate in regulation state (VGS=Vth)；When corresponding to the corresponding current detection signal conducting higher than reference value
When voltage ratio is compared with bipolar junction transistor, the lock source capacitance in enhanced n-channel metal-oxide half field effect transistor passes through corresponding
Photo-coupler and corresponding anti-clamp resistance discharge so that enhanced n-channel metal-oxide half field effect transistor operates in off-state
(VGS＜ Vth).Accordingly, all normally closed bypass cock S1, S2 and S3 will shuttle in three kinds of on off states, and normally closed current regulation
Switch S0 only shuttles in conducting and regulation state, will not operate in off-state.
In summary, the LED light device proposed according to the foregoing preferred embodiment of the present invention can be according to rectification
String ripple input voltage afterwards, controls the quantity lighted and extinguished of LED subarrays, and the electric current by LED subarrays, with up to
To high power factor and low total harmonic distortion.If it is further equipped with the selectivity disclosed in one embodiment of the present of invention
The flicker of setting suppresses electric capacity, the disclosed LED light engine with Alternating Current Power Supply can maintain almost identical high power because
Improve scintillation in the case of several and low total harmonic distortion, without causing any infringement.
Principle, preferred embodiment and the operator scheme of the present invention are had been described for according to the above.However, the present invention should not
It is understood as that the specific embodiment for being limited to discuss.On the contrary, embodiments described above should be considered as illustrate rather than
Limitation, and it is believed that under the situation for not departing from the scope of the invention defined in following claims, art technology
Personnel can make change to these embodiments.
Claims (14)
1. a kind of LED light engine with Alternating Current Power Supply, rectifier and the LED subarrays of multiple outsides are coupled to, including：
Multiple normally closed bypass cocks, in the LED subarrays of the multiple outside in addition to the LED subarrays of most higher level or most subordinate,
Each normally closed bypass cock be parallel to respectively corresponding to LED subarrays, and three kinds to shuttle in conducting, regulation and cut-off are opened
Off status；
Multiple current sense resistors, including the first current sense resistor and multiple second current sense resistors, are connected to described more
The LED subarrays of individual outside, and first current sense resistor directly concatenates the multiple second current sense resistor；
Normally closed current regulator, the multiple normally closed bypass cock is coupled to, and to the peak value of adjusting proximity external voltage source
Highest LED current level be definite value, wherein the normally closed current regulator is controlled current regulating switch；And
Multiple switch controller, including first switch controller and multiple second switch controllers, it is respectively coupled to first electricity
The detection tap and the corresponding detection tap of the multiple second current sense resistor of detection resistance are flowed, and is respectively coupled to controlled
Current regulating switch and corresponding normally closed bypass cock using as feedback network, and respectively being examined according to first electric current
Corresponding to detection tap corresponding to the current detection signal and the multiple second current sense resistor of the detection tap of measuring resistance
Current detection signal, control the state of the controlled current regulating switch and corresponding normally closed bypass cock, wherein it is described by
The current regulating switch of control is the first metal-oxide half field effect transistor, and by the first switch controller according to the described first electricity
The current detection signal for flowing the detection tap of detection resistance is adjusted.
2. as claimed in claim 1 with the LED light engine of Alternating Current Power Supply,
Wherein described corresponding detection tap is the high level end of corresponding second current sense resistor, and described first is electric
The detection tap for flowing detection resistance is the high level end of first current sense resistor.
3. as claimed in claim 2 with the LED light engine of Alternating Current Power Supply, wherein the multiple second current sense resistor is each other
It is connected in series, and the corresponding current detection signal is the voltage electricity of the high-pressure side of corresponding second current sense resistor
It is flat.
4. as claimed in claim 1 with the LED light engine of Alternating Current Power Supply, wherein the multiple normally closed bypass cock is enhanced
N-channel metal-oxide half field effect transistor or depletion type n-channel metal-oxide half field effect transistor.
5. as claimed in claim 1 with the LED light engine of Alternating Current Power Supply, wherein each normally closed bypass cock is enhanced
N-channel metal-oxide half field effect transistor, and each switch controller is as gate drive circuit, including anti-clamp resistance, limit
Leakage resistance, gate pole discharge diode, gate pole charging resistor and voltage ratio are compared with bipolar junction transistor, wherein the current-limiting resistance coupling
Connect the negative electrode and passage of the voltage ratio compared with bipolar junction transistor of the gate pole discharge diode, the anti-clamp resistance coupling
Connect base stage of the voltage ratio compared with bipolar junction transistor, the gate pole charging resistor coupling corresponding normally closed bypass
The gate pole of switch, the corresponding normally closed bypass cock is thus controlled to shuttle in three kinds of on off states, wherein the gate pole
Charging resistor and the voltage ratio are connected to the door of the enhanced n-channel metal-oxide half field effect transistor compared with bipolar junction transistor altogether
Pole.
6. as claimed in claim 1 with the LED light engine of Alternating Current Power Supply, wherein each switch controller includes voltage ratio
It is described corresponding to control as gate drive circuit compared with bipolar junction transistor, the second shunt regulator or photo-coupler
Normally closed bypass cock shuttles in three kinds of on off states.
7. as claimed in claim 1 with the LED light engine of Alternating Current Power Supply, in addition to it is multiple determine voltage regulator, to turn on
Corresponding normally closed bypass cock, wherein each normally closed bypass cock is enhanced n-channel metal-oxide half field effect transistor, it is each
It is described to determine voltage regulator and include voltage storage electric capacity, it is described to determine voltage regulator and stored up at the both ends of corresponding voltage storage electric capacity
Deposit and determine voltage so that the inside lock source electric capacity of enhanced n-channel metal-oxide half field effect transistor is by determining voltage source corresponding to described
Charging, rising edge or falling edge without the string ripple input voltage waveform after by rectification are influenceed.
8. institute is coupled to the LED light engine of Alternating Current Power Supply, in addition to divider, the divider as claimed in claim 1
Rectifier is stated to provide the string ripple input voltage after the rectification of scaled down so that the current detection signal adjusts with string ripple
Voltage is made comparisons, wherein the divider includes the first resistor and second resistance of series connection.
9. further included as claimed in claim 1 with the LED light engine of Alternating Current Power Supply：
Multiple flickers suppress electric capacity, and each flicker suppresses electric capacity coupled in parallel in the corresponding LED subarrays, as auxiliary
Power supply is helped to provide the electric current by the LED subarrays；And
Multiple electric charges retain diodes, each electric charge retain diode be coupled to it is described corresponding to normally closed bypass cock with it is right
Between the flicker answered suppresses electric capacity, to prevent each flicker from suppressing the electric charge of electric capacity by unexpected circuit element
Consumption, rather than consumed by the corresponding LED subarrays.
10. a kind of integrated circuit for lighting device, including as claimed in claim 1 with the LED light engine of Alternating Current Power Supply.
11. it is used for the integrated circuit of lighting device as claimed in claim 10, wherein the integrated circuit has multiple pins
LED subarrays and the multiple second current sense resistor to the multiple outside of external connection, and adjacent two institutes
State both ends of the pin to the internal both ends or each switch controller for connecting each normally closed bypass cock.
12. it is used for the integrated circuit of lighting device as claimed in claim 11, wherein, an inside in the multiple pin
The reference edge for a switch controller being connected in the multiple switch controller.
13. a kind of lighting device, including：
Rectifier, AC power is coupled to, to provide the voltage after rectification；
With the LED light engine of Alternating Current Power Supply, it is coupled between the rectifier and the LED subarrays of multiple outsides, wherein described
LED light engine includes：
Multiple normally closed bypass cocks, wherein, except most higher level or the LED submatrixs of most subordinate in the LED subarrays of the multiple outside
Row are outer, and each normally closed bypass cock is parallel to corresponding LED subarrays respectively, and shuttle in conducting, regulation and cut-off
Three kinds of on off states；
Multiple current sense resistors, including the first current sense resistor and multiple second current sense resistors, are connected to described more
The LED subarrays of individual outside, and first current sense resistor directly concatenates the multiple second current sense resistor；
Normally closed current regulator, the multiple normally closed bypass cock is coupled to, and to the peak value of adjusting proximity external voltage source
Highest LED current level be definite value, it is described controlled wherein the normally closed current regulator is controlled current regulating switch
Current regulating switch is the first metal-oxide half field effect transistor；And
Multiple switch controller, including first switch controller and multiple second switch controllers, are respectively coupled to described first
Detection tap corresponding to the detection tap of current sense resistor and the multiple second switch controller, and be respectively coupled to described
Controlled current regulating switch and the corresponding normally closed bypass cock, wherein detection tap corresponding to described is described corresponding
The high level end of second current sense resistor, using as feedback network, and to the current detection signal corresponding to, control institute
Multiple switch state is stated, first metal-oxide half field effect transistor is by the first switch controller according to first electric current
The current detection signal of detection resistance is adjusted.
14. lighting device as claimed in claim 13, wherein the multiple second current sense resistor is concatenated with one another and described
Corresponding current detection signal is the voltage level of the high-pressure side of corresponding second current sense resistor, and described first is electric
The current detection signal of stream detection resistance is the voltage level of the high-pressure side of first current sense resistor.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW102145709A TWI508617B (en) | 2013-12-11 | 2013-12-11 | Electronic control gears for led light engine and application thereof |
| TW102145709 | 2013-12-11 | ||
| TW103115395A TWI499352B (en) | 2014-04-29 | 2014-04-29 | Electronic control gears for led light engine and application thereof |
| TW103115395 | 2014-04-29 |
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| CN104717797A CN104717797A (en) | 2015-06-17 |
| CN104717797B true CN104717797B (en) | 2018-03-02 |
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| TW201218851A (en) * | 2010-10-29 | 2012-05-01 | Numen Technology Inc | which can ignite different number of LED's, and can enhance the efficiency of stacked LED driving circuit |
| CN102612861A (en) * | 2009-11-13 | 2012-07-25 | 日亚化学工业株式会社 | Light-emitting diode drive device and light-emitting diode illumination control method |
| CN103249217A (en) * | 2012-02-03 | 2013-08-14 | 日亚化学工业株式会社 | Light-emitting diode driving apparatus |
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| US9713211B2 (en) * | 2009-09-24 | 2017-07-18 | Cree, Inc. | Solid state lighting apparatus with controllable bypass circuits and methods of operation thereof |
| CN102202441A (en) * | 2010-03-23 | 2011-09-28 | 陕西西电科大华成电子股份有限公司 | Constant-current controller topology circuit powered directly by alternating current power supply for LED lighting lamp |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102612861A (en) * | 2009-11-13 | 2012-07-25 | 日亚化学工业株式会社 | Light-emitting diode drive device and light-emitting diode illumination control method |
| TW201218851A (en) * | 2010-10-29 | 2012-05-01 | Numen Technology Inc | which can ignite different number of LED's, and can enhance the efficiency of stacked LED driving circuit |
| CN103249217A (en) * | 2012-02-03 | 2013-08-14 | 日亚化学工业株式会社 | Light-emitting diode driving apparatus |
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