CN102428754B - Driver circuit for an LED - Google Patents
Driver circuit for an LED Download PDFInfo
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- CN102428754B CN102428754B CN201080019793.1A CN201080019793A CN102428754B CN 102428754 B CN102428754 B CN 102428754B CN 201080019793 A CN201080019793 A CN 201080019793A CN 102428754 B CN102428754 B CN 102428754B
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- 239000000523 sample Substances 0.000 claims description 17
- 238000012544 monitoring process Methods 0.000 claims description 16
- 238000009499 grossing Methods 0.000 claims description 11
- 238000005286 illumination Methods 0.000 claims description 11
- 238000002955 isolation Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 230000005347 demagnetization Effects 0.000 abstract 1
- 239000003990 capacitor Substances 0.000 description 9
- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 230000003213 activating effect Effects 0.000 description 2
- 230000004913 activation Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/382—Switched mode power supply [SMPS] with galvanic isolation between input and output
Abstract
The invention relates to a driver circuit for an LED, comprising a connection for a mains voltage, a rectifier (GR1), a filter circuit (L1), an inductor(L2), and a switch (S1), wherein the inductor (L2) is magnetized when the switch(S1) is closed, and the inductor (L2) is demagnetized when theswitch (S1) is opened, and the current feeds the LED through theinductor (L2) at least during the phase of the demagnetization,wherein the switch (S1) is always opened only when the current through theswitch (S1) has reached a specified threshold, and thespecified threshold depends on the present amplitude of thesupply voltage Vin.
Description
Technical field
The present invention relates to a kind of LED drive circuit of preamble according to claim 1, the invention still further relates to a kind of method of control LED of preamble according to claim 21.
Background technology
This drive circuit is applied in the illumination system, to realize carrying out colour or regional illumination to room, road or passway for escaping.Usually, lighting apparatus is driven by driving arrangement, and activates when needed.For this illumination, organic or inorganic light-emitting diode (LED) can be adopted as light source.
In order to throw light on, gaseous discharge lamp and incandescent lamp is replaced to adopt light-emitting diode as light source more and more at large.Efficiency and the luminous quantity of light-emitting diode constantly improve fast, thus it has been applied in the various fields of normal lighting.But light-emitting diode is point-source of light, and launch the strong light converged.
But the shortcoming of current LED illumination System is often, due to aging or color or brightness may be made to change owing to changing single led or LED component.In addition, owing to blocking thermal radiation, secondary optics device can have an impact to temperature treatment.In addition, due to aging and heat effect, may there is change in the phosphor of LED.
Brightness change can only utilize complicated control circuit to realize usually, and cannot be connected with common dimmer simply, this is because there will be optical flare with during most of dimmer collaborative work, even these dimmer cisco unity malfunctions.
Summary of the invention
Task of the present invention is to provide a kind of lighting apparatus and a kind of method, and it, not having above-mentioned shortcoming in other words under significantly reducing these shortcoming situations, realizes the operation of fault-free and energy savings by the lighting apparatus with light-emitting diode.
According to the present invention, this task is come for such device by the characteristic features of claim 1.Particularly advantageous execution mode of the present invention is described in the dependent claims.
For the inventive solution of LED (organic or inorganic light-emitting diode) drive unit based on such thought, that is, a kind of LED drive circuit, it has power supply interface, filter circuit, rectifier, inductance and switch.The secondary coil that described inductance has primary coil and is coupled with primary coil.When described switch connection, described inductance is magnetized; And when described switch disconnects, described inductance by degaussing, and at least in the degaussing stage, powers to described LED by described inductance.
Only when the electric current flowing through switch reaches predetermined threshold, switch just disconnects.Predetermined threshold can depend on the current amplitude of supply power voltage.The break time of described switch can depend on the detected amplitude flowing through the electric current of described LED.Additionally or alternatively, the break time of described switch also can depend on demagnetizing current (Entmagnetisierungsstrom).
A kind of method by dimmer control LED is also advised according to the present invention, wherein, described LED is controlled by drive circuit, and described drive circuit is from power supply interface, be powered via filter circuit and rectifier, and described drive circuit has inductance and switch and buffer element, wherein, control energy to be passed to described lighting apparatus via described inductance by the high frequency clock of described switch, wherein, described switch also keeps connecting between the described dimmer off period, and and if only if the electric current flowing through described switch reaches predetermined threshold, described switch just disconnects.
Also bridgt circuit can be provided with according to the present invention, described bridgt circuit is connected with power supply interface by rectifier, and described bridgt circuit flows to described inductance and described switch at electric current via described rectifier or is disabled when flowing to described buffer element.
Whenever current direction LED drive circuit, just forbid bridgt circuit.Always when electric current flows through inductance and switch via rectifier or flows to buffer element, electric current just flows to LED drive circuit.Decoupling link or current monitoring link can serve as current probe." by it, the rectifier that bridgt circuit is connected with power supply interface " can be same rectifier with " by it, the rectifier of current direction inductance and switch or buffer element ", or can arrange another rectifier in parallel with described first rectifier.
Inventive solution also relates to a kind of LED illumination device, and it has according to drive circuit of the present invention, and described lighting apparatus has base, in order to by described luminaire applications in common lamp socket.
The invention still further relates to a kind of method of control LED, wherein, described LED is controlled by drive circuit, and described drive circuit is from power supply interface, be powered via filter circuit and rectifier, and described drive circuit has buffer element, inductance and switch, wherein, the output of described rectifier is provided with bridgt circuit, and when electric current flows to described drive circuit via described rectifier, described bridgt circuit is disabled.
In this way can be realized the face illumination of very uniformity by the lighting apparatus with light-emitting diode, wherein can regulate the brightness of light-emitting diode in a simple manner decoupled.
Embodiment
The present invention should be further described by reference to the accompanying drawings below.In figure:
Fig. 1 illustrates first execution mode of apparatus of the present invention;
Fig. 2 illustrates second execution mode of apparatus of the present invention;
Fig. 3 illustrates another execution mode of apparatus of the present invention;
Fig. 4 illustrates another execution mode of apparatus of the present invention.
Below in conjunction with first embodiment with LED drive circuit according to Fig. 1, the present invention is described.
LED drive circuit has power supply interface, filter circuit (L1), rectifier (GR1), inductance (L2) and switch (S1).After buffer element (C1) is positioned at rectifier (GR1), this buffer element preferably only for the change of filtering high frequency voltage, and does not implement obvious smoothing effect to the voltage of rectifier (GR1) output.Buffer element (C1) is such as capacitor, preferably filtering capacitor.The secondary coil (L2s) that inductance (L2) preferably has primary coil (L2p) and is coupled with this primary coil.
When a switch is on, inductance (L2) is magnetized; And when switch S 1 disconnects, inductance (L2) by degaussing, and at least in the degaussing stage, carries electric current by inductance (L2) to LED.
Only when the electric current flowing through switch S 1 reaches predetermined threshold, so with regard to cut-off switch S1.
The electric current flowing through switch S 1 can detect by means of current detector Ip (such as current diverter).But current detector Ip also can be embodied directly in switch S, such as, in so-called checkout area effect transistor (SENSEFET), it comprises integrated current monitoring.Especially the on-time of switch S 1 have no time on restriction, the turn-on time of switch S 1 can be unlimited.
The break time of switch S 1 can depend on the detected amplitude flowing through the electric current of LED.Preferably, the feedback flowing through the amplitude detection of the electric current of LED implements in the mode of potential isolation, (that is depending on the control loop of the break time of switch S 1).But such as also can specify (fixing setting) break time.
The break time of switch S 1 such as also can depend on demagnetizing current (Entmagnetisierungsstrom) directly or indirectly.When the degaussing of inductance (L2) is determined, just can turn on-switch S1.But also can always just implement when inductance (L2) degaussing to connect, at the time point of degaussing with also can there is regular hour section between reclosing.
This drive circuit can be connected on common dimmer, and switch S 1 can be switched between this dimmer off period, to guide residual current by inductance and switch S 1 and therefore to load dimmer.But the residual current flowing through switch S 1 is limited by predetermined threshold, transship to avoid switch S 1.
Inductance (L2) can be transformer (L2p, L2s), and this transformer serves as potential isolation link.
The high frequency clock that drive circuit also can pass through switch (S1) controls energy to be passed to lighting apparatus (LED) via inductance (L2).Switch (S1) can be such as field-effect transistor, such as MOSFET or bipolar transistor.
Predetermined threshold value can depend on the current amplitude of supply power voltage Vin.In a simple deformation mode, such as, when supply power voltage Vin exceedes certain value, threshold value can be improved.But also can improve threshold value with multi-level approach.
If as supply power voltage, AC alternating voltage has the frequency being generally 50Hz or 60Hz, and so predetermined threshold value especially can depend on the current amplitude of the rectified sinusoidal half-wave of AC alternating voltage.This current amplitude is preferably monitored with high frequency sampling or continuous monitor mode, does not preferably detect the mean value in one or more cycle of supply power voltage.
The current amplitude of supply power voltage Vin can be monitored by supervisory circuit U1.Supervisory circuit U1 can be such as integrated circuit (such as ASIC, microcontroller or DSP).Supervisory circuit U1 can depend on the monitoring of the current amplitude of supply power voltage Vin to be given for the threshold value of cut-off switch S1.
Supervisory circuit U1 such as can be detected by buffer element C1 in other words on (positive pole) output of rectifier GR1, if or there is decoupling link, also detected before decoupling link, or detect the voltage difference (preferably measuring the voltage before and after decoupling link respectively) in decoupling link.In a simple mode of texturing, by means of voltage divider measuring voltage, this voltage divider measures voltage in other words on buffer element C1 on (positive pole) output of rectifier GR1, and is down to an electromotive force, and this electromotive force can be analyzed by supervisory circuit U1.
But supervisory circuit U1 also can so design (such as in High-Voltage Technology), with make its can direct-detection at the voltage of buffer element C1 in other words on (positive pole) output of rectifier GR1.
Supervisory circuit U1 also can control switch S1.In this case, the current amplitude of supply power voltage Vin by means of current detector Ip (such as current diverter) monitoring flow through switch S 1 electric current, but also can additionally be monitored in supervisory circuit U1 mono-aspect.Whenever the electric current flowing through switch S 1 reaches predetermined threshold, supervisory circuit U1 just can the disconnection of trigger switch S1.As already described, this threshold value is preferably based on and specifies the monitoring of the current amplitude of supply power voltage Vin.Such as only can specify that two values are as threshold value, wherein, specify lower threshold at supply power voltage Vin lower than when particular value, and when supply power voltage Vin exceeds particular value set upper limit threshold value.But also can store multiple threshold value according to forms mode, and specify these threshold values according to the form regulation for the various voltage range of supply power voltage Vin.
Supervisory circuit U1 also can be two-part (be such as two integrated circuit form, these two integrated circuits are connected to each other).On the one hand can there is the first supervisory circuit U1a, it depends on and carrys out defined threshold to the monitoring of the current amplitude of supply power voltage Vin.This threshold value can be forwarded to the second supervisory circuit U1b by the first supervisory circuit U1a.Second supervisory circuit U1b can perform the control to switch S1.
Supervisory circuit U1b can monitor the electric current that flows through switch S 1 and according to this current-controlled switch S1.This control can depend on the threshold value specified by the first supervisory circuit U1a.
In addition, this control can depend on that other monitoring are implemented, such as, according to the monitoring to inductance L 2 degaussing, according to detected LED electrical pressure or according to the detected amplitude flowing through the electric current of LED.According to optimal way, all feedbacks in primary side or monitoring realize according to the mode of potential isolation, that is will in the upper detected signal feedback of outlet side (primary side) to supervisory circuit U1 by potential isolation (such as by means of optical coupler or transformer).As already described, the break time of switch S 1 preferably depends on the detected amplitude flowing through the electric current of LED.
Inductance L 2 can be transformer L2p, L2s, and this transformer serves as potential isolation link.At this, the primary coil L2p of transformer connects with switch S 1.Be connected with smoothing circuit (C2) with rectifier (D2) with the magnetic-coupled secondary coil L2s of primary coil L2p, LED can be connected on this smoothing circuit (C2).Rectifier (D2) on transformer secondary coil L2s can be made up of full-wave rectifier by diode D2 or also.Inductance L 2 can be powered to smoothing circuit when its degaussing, and this smoothing circuit can be such as capacitor C2 or LC filter (capacitor C2-inductance L 3) or CLC filter (capacitor C2-inductance L 3-capacitor C3).The primary side with smoothing circuit (C2) preferably so designs, that is, can give LED delivered constant electric current.
Be feasible by the method for dimmer control LED, wherein, this LED is controlled by drive circuit, and wherein, by high frequency clock control switch S1, energy is delivered to LED via inductance L 2.Switch S 1 also keeps connecting between the dimmer off period, as long as and the electric current flowing through switch S 1 reaches predetermined threshold, so with regard to cut-off switch S1.This means (that is do not have supply voltage to pass through) between the dimmer off period, as long as the electric current flowing through switch S 1 does not reach predetermined threshold, switch S 1 just keeps connecting.Until the electric current flowing through switch S 1 reaches predetermined threshold, switch S 1 just remains open (as already described, this depends on the corresponding conditions determining opening time) at certain hour and again connects.Thus compared with the time period that there is supply voltage, between the dimmer off period, the turn-on time of switch S 1 is longer, this is because based on there is not supply voltage, the electric current flowing through inductance L 2 and switch S 1 rises more lentamente.
The drive circuit with supervisory circuit U1 also can so design, namely, when lighting apparatus (LED) does not work or is only supplied to the supply power voltage Vin being significantly less than nominal supply voltages Vin, switch (S1) still keeps connecting, as long as and when the electric current flowing through switch (S1) reaches predetermined threshold, switch (S1) just disconnects.As long as switch (S1) is not disconnected by corresponding ACTIVE CONTROL, such as, just this switch can be remained on on-state by holding circuit.Such as can being bridged or just can carrying out ACTIVE CONTROL, to disconnect (shutoff) switch (S1) by the control level (Ansteuerpegel) reducing switch (S1) control interface by this holding circuit.
Holding circuit also can so design, as long as that is, drive circuit input exists faint voltage, so during drive circuit self also unstart, switch (S1) is just remained on on-state by this holding circuit.
Thus can there is the LED illumination device of drive circuit of the present invention, this lighting apparatus has base, in order to by this luminaire applications in common lamp socket.
Below in conjunction with second embodiment with LED drive circuit shown in Fig. 2, Fig. 3 and Fig. 4 so that the present invention to be described.
This drive circuit has power supply interface, is rectifier GR1 and filter circuit L1 and buffer element after this power supply interface.Follow by inductance L 2 and switch S 1.When switch S 1 is connected, inductance L 2 is magnetized; And when switch S 1 disconnects, inductance L 2 by degaussing, and at least in the degaussing stage, carries electric current by inductance L 2 to LED.
Drive circuit can be constructed to booster circuit or circuit of reversed excitation.This circuit of reversed excitation or booster circuit preferably realize in the mode of potential isolation, and that is, the inductance L 2 of the clock control of drive circuit has secondary coil L2s, the primary coil L2p magnetic coupling of this secondary coil L2s and inductance L 2.
The current probe being preferably unidirectional decoupling link is included between rectifier GR1 and buffer element C1.
According to the example of Fig. 2 and Fig. 3, the decoupling link as current probe can be made up of diode D1.But full-wave rectifier DV1 also can serve as decoupling link.The electric current flowing to inductance (L2) and switch (S1) and/or filtering capacitor (C1) via rectifier (GR1) can be monitored by means of current probe.
The output of rectifier GR1 is provided with bridgt circuit (R40, Q4), and when current probe (such as decoupling link) allows electric current to flow through, this bridgt circuit (R40, Q4) is disabled.
Whenever current direction LED drive circuit, this bridgt circuit (R40, Q4) just activates.Always when electric current flows through inductance L 2 and switch S 1 via rectifier GR1 or flows to buffer element, electric current just flows to LED drive circuit.
Thus decoupling link serves as current probe.Once electric current flows through inductance L 2 and switch S 1 via rectifier GR1 or flows to buffer element, so in decoupling link, just there will be voltage, this voltage is only slightly higher than the voltage (voltage namely after decoupling link) on buffer element.Voltage in decoupling link can be monitored.This monitoring can be completed by supervisory circuit U1.Supervisory circuit U1 can be such as integrated circuit.
Supervisory circuit U1 can activate or forbid bridgt circuit (R40, Q4) according to the monitoring of the decoupling link as current probe.
Supervisory circuit U1 such as only can detect the voltage before decoupling link or the voltage difference in decoupling link (preferably detecting the voltage before and after decoupling link respectively).Supervisory circuit U1 also can control switch S1.
Decoupling link as current probe can be made up of diode D1.But full-wave rectifier DV1 also can serve as decoupling link.
This drive circuit can be connected on common dimmer, and bridgt circuit (R40, Q4) can be connected between the dimmer off period, to guide residual current pass through bridgt circuit (R40, Q4) and inductance 12 and switch S 1 and therefore load dimmer.
Buffer element such as can by filling out paddy circuit (Fig. 3) or also can being made up of the capacitor (Fig. 2) as buffer element C1.
When the degaussing of inductance L 2 is determined, just can turn on-switch S1.
But also can always just implement when inductance L 2 degaussing to connect, at the time point of degaussing with also can there is regular hour section between reclosing.
Switch S 1 such as can be controlled by the integrated switching circuit for power factor correction.Supervisory circuit U1 can comprise the control circuit for power factor correction.
Inductance L 2 can be transformer L2p, L2s, and this transformer serves as potential isolation link.At this, the primary coil L2p of transformer connects with switch S 1.Be connected with smoothing circuit (C2) with rectifier (D2) with the magnetic-coupled secondary coil L2s of primary coil L2p, LED can be connected on this smoothing circuit (C2).Rectifier (D2) on transformer secondary coil L2s can be made up of full-wave rectifier by diode D2 or also.
The connection of switch S 1 and/or break time can depend on the amplitude flowing through the electric current of LED detected.But the connection of switch S 1 and/or break time are not preferably down to zero or close to zero.In a simple deformation mode, to flow through LED electric current limiting examples as can by limit the on-time realize.
Inductance L 2 can be powered to smoothing circuit (C2) when its degaussing, and this smoothing circuit (C2) can be such as capacitor C2 or LC or CLC filter.Bridgt circuit (R40, Q4) can be connected with switch Q4 by resistor R40 and be formed.
But bridgt circuit also can have current source (constant-current source) as bridgt circuit.Fig. 4 illustrates an example of current source (constant-current source).
Fig. 4 only illustrates a part for the drive circuit of the present invention for lighting apparatus.
Current probe is made up of current monitoring link R34.Depend on the electric current flowing through current monitoring link R34, supervisory circuit U1 (it is made up of transistor Q5 and resistor R30, and resistor R30 is connected with internal electric source Vcc) can activate or forbid bridgt circuit.
Once define enough electric currents to flow through current probe (namely current monitoring link R34), just forbid bridgt circuit.The electric current flowing through current monitoring link R34 (current probe) is such electric current, and described electric current flows to inductance (L2) and switch (S1) via rectifier (GR1) or flows to buffer element.
According in the example of Fig. 4, supervisory circuit U1 is formed discretely, but it also equally with the example of Fig. 2 and Fig. 3 can be designed to integrated circuit.When adopting integrated circuit as supervisory circuit U1, can by other functions such as to the control integration of switch S1 to wherein.
According to Fig. 4, bridgt circuit is made up of current source (constant-current source).Current source (constant-current source) is specifically made up of transistor Q4 and Q6 and resistor R40, R27 and R29.
As shown in Figure 4, bridgt circuit can be connected (in parallel with rectifier GR1) by full-wave rectifier D3 by filter circuit L2 with power supply interface.
" by it; the rectifier that bridgt circuit (R40, Q4) is connected with power supply interface " can be same rectifier (namely the rectifier GR1 of Fig. 2 and Fig. 3) with " by it; the rectifier of current direction inductance and switch or buffer element ", or can arrange another rectifier D3 with this first rectifier GR1 (see Fig. 4) in parallel.
Thus a kind of method for control LED is exactly feasible, wherein, this LED is controlled by drive circuit, and this drive circuit is powered via filter circuit (L1) and rectifier (GR2) by power supply interface, and this drive circuit has buffer element, inductance (L2) and switch (S1), and wherein, when electric current flows to drive circuit via rectifier (GR1), the bridgt circuit (R40, Q4) be arranged on rectifier (GR1) output is disabled.
Thus can there is the LED illumination device of drive circuit of the present invention, this lighting apparatus has base, in order to by this luminaire applications in common lamp socket.
The execution mode of Fig. 1 also can combine with the execution mode of Fig. 2 to Fig. 4.On the one hand, as long as the electric current flowing through switch S 1 does not reach predetermined threshold, always switch S 1 just can keep connecting; Additionally can there is the bridgt circuit (R40, Q4) that can activate, only when detecting that enough electric currents flow through current probe, just activating this bridgt circuit (R40, Q4).Form two current paths that electric current can flow through by this way, and thus this bridgt circuit (R40, Q4) can be so set, that is, this bridgt circuit (R40, Q4) (with not by compared with the solution of the second current path of switch (S1)) when it activates only produces less supplementary load loss.
Also a kind of drive circuit being preferably LED for lighting apparatus can be constructed, it has power supply interface, rectifier GR1 and filter circuit, buffer element (C1), inductance L 2 and switch S 1, wherein, control energy to be sent to lighting apparatus by inductance by the high frequency clock of switch S 1, and bridgt circuit (R40, Q4) can be so arranged on the output of rectifier GR1, when not working with convenient lighting apparatus (LED), this bridgt circuit (R40, Q4) activates.
This situation is such as the weak voltage not having supply voltage or be only significantly less than supply voltage.Bridgt circuit (R40, Q4) can so design, that is, only when lighting apparatus (LED) works, just forbid this bridgt circuit (R40, Q4).Bridgt circuit (R40, Q4) such as can so connect, namely, as long as there is voltage on bridgt circuit (R40, Q4), then just realize electric current without the need to starting (activation) bridgt circuit (R40, Q4) and flow through this bridgt circuit (R40, Q4).Bridgt circuit (R40, Q4) such as also can so realize, namely, as long as there is faint voltage on drive circuit input, so during drive circuit self also unstart, switch (S1) has just been remained on on-state by it.
Also the comparatively highly compatible relative to so-called circuit-breaker (Netzfreischalter) can be obtained by this way.The situation of load (that is, only having very small area analysis to flow through load) is not connected in circuit-breaker identification, and is separated with electrical network by related circuit for this situation.In order to identify the connection again of load (namely electrical appliance), circuit-breaker utilizes the low level voltage of such as 20V to connect usually.If bridgt circuit (R40, Q4) is in state of activation (this is because lighting apparatus is disconnected), this bridgt circuit shows as load when lighting apparatus is connected, and this load is enough to circuit-breaker to be switched to mains supply.
Additional, at lighting apparatus run duration, bridgt circuit (R40, Q4) can only determine during electric current flows through current probe disabled.
Bridgt circuit (R40, Q4) preferably has switch element such as transistor (Q4), and transistor can be controlled thus to forbid bridgt circuit (R40, Q4).The forbidding of bridgt circuit (R40, Q4) can be implemented by supervisory circuit U1.
At this, the work of lighting apparatus (LED) can be understood as, and does not work for control LED with to the drive circuit of its supplying energy.But can there is faint supply power voltage Vin in this case, but this supply power voltage Vin has been not enough to the drive circuit that trend LED powers, and can not occur especially in this state by drive circuit high frequency clock control switch (S1).(wherein, can turn on-switch (S1) by drive circuit, but between the switching on and off of switch (S1), (high frequency) fast does not occur and switch.) but the supply power voltage Vin existed is enough to some part activating drive circuit, such as bridgt circuit or holding circuit.
But lighting apparatus also can be such as gaseous discharge lamp.
Thus can there is the LED illumination device of drive circuit of the present invention according to the present invention, this lighting apparatus has base, in order to by this luminaire applications in common lamp socket.
Claims (21)
1. a LED drive circuit, it has power supply interface, rectifier (GR1), filter circuit (L1), switch (S1) and inductance (L2), the secondary coil (L2s) that described inductance has primary coil (L2p) and is coupled with described primary coil
Wherein, when described switch (S1) is connected, described inductance (L2) is magnetized,
And when described switch (S1) disconnects, described inductance (L2) by degaussing,
And at least powered to described LED by described inductance (L2) in the degaussing stage,
Wherein, only when the electric current flowing through described switch (S1) reaches predetermined threshold, described switch (S1) just disconnects,
It is characterized in that, described predetermined threshold depends on the current amplitude of supply power voltage (Vin).
2. LED drive circuit according to claim 1, is characterized in that, the break time of described switch (S1) depends on demagnetizing current.
3. LED drive circuit according to claim 1, it is characterized in that, described drive circuit can be connected on common dimmer, and described switch (S1) is connected between the described dimmer off period, to guide residual current flow through described inductance (L2) and described switch (S1) and therefore load described dimmer.
4. according to the LED drive circuit one of claims 1 to 3 Suo Shu, it is characterized in that, when the degaussing of described inductance (L2) is determined, described switch (S1) is just connected.
5. according to the LED drive circuit one of claims 1 to 3 Suo Shu, it is characterized in that, always just implement the connection of described switch (S1) when described inductance (L2) degaussing.
6. according to the LED drive circuit one of claims 1 to 3 Suo Shu, it is characterized in that, described inductance (L2) serves as potential isolation parts.
7. according to the LED drive circuit one of claims 1 to 3 Suo Shu, it is characterized in that, described inductance (L2) is powered to smoothing circuit (C2) when its degaussing.
8. according to the LED drive circuit one of claims 1 to 3 Suo Shu, it is characterized in that, the output of described rectifier (GR1) is provided with bridgt circuit (R40, Q4), and described bridgt circuit is disabled when electric current flows to described inductance (L2) and described switch (S1) via described rectifier (GR1).
9. LED drive circuit according to claim 8, it is characterized in that, between described rectifier (GR1) and buffer element (C1), comprise current probe, and the electric current flowing to described inductance (L2) and described switch (S1) and/or described buffer element (C1) via described rectifier (GR1) can be monitored by means of described current probe.
10. LED drive circuit according to claim 9, is characterized in that, described current probe is made up of decoupling link (D1).
11. LED drive circuits according to claim 9, is characterized in that, described current probe is made up of current monitoring link (R34).
12. LED drive circuits according to claim 8, it is characterized in that, described drive circuit can be connected on common dimmer, and described bridgt circuit (R40, Q4) is activated between the described dimmer off period, to guide residual current pass through described bridgt circuit (R40, Q4) and therefore load described dimmer.
13. LED drive circuits according to claim 1, is characterized in that, the connection of described switch (S1) and/or break time depend on the amplitude of electric current that is detected, that flow through described LED.
14. LED drive circuits according to claim 8, is characterized in that, described bridgt circuit (R40, Q4) is in series by resistor (R40) and switch (Q4).
15. LED drive circuits according to claim 8, is characterized in that, described bridgt circuit (R40, Q4) has current source.
16. 1 kinds of LED illumination device, it has according to the drive circuit one of aforementioned claim Suo Shu, and described lighting apparatus has base, in order to by described luminaire applications in common lamp socket.
17. 1 kinds of drive circuits for lighting apparatus, described drive circuit has power supply interface, rectifier (GR1), filter circuit (L1), buffer element (C2), inductance (L2) and switch (S1), wherein, control energy to be passed to described lighting apparatus via described inductance (L2) by the high frequency clock of described switch (S1)
It is characterized in that,
When for control described lighting apparatus and the drive circuit of powering for described lighting apparatus do not work time, described switch (S1) still keeps connecting, and and if only if when the electric current flowing through described switch (S1) reaches predetermined threshold, described switch just disconnects, wherein, described predetermined threshold depends on the current amplitude of supply power voltage (Vin).
18. drive circuits for lighting apparatus according to claim 17, is characterized in that, described lighting apparatus is LED.
19. 1 kinds of LED illumination device, it has drive circuit according to claim 17, and described lighting apparatus has base, in order to by described luminaire applications in common lamp socket.
20. 1 kinds control the method for lighting apparatus by dimmer, and wherein, described lighting apparatus is controlled by drive circuit,
And described drive circuit is from power supply interface, be powered via filter circuit (L1) and rectifier (GR1),
And described drive circuit has inductance (L2) and switch (S1) and buffer element (C2),
Wherein, control energy to be passed to described lighting apparatus via described inductance (L2) by the high frequency clock of described switch (S1),
It is characterized in that,
Described switch (S1) also keeps connecting between the described dimmer off period, and and if only if the electric current flowing through described switch (S1) reaches predetermined threshold, described switch just disconnects, and wherein, described predetermined threshold depends on the current amplitude of supply power voltage (Vin).
The method of 21. control lighting apparatus according to claim 20, is characterized in that, described lighting apparatus is LED.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT2132009 | 2009-04-03 | ||
| ATGM213/2009 | 2009-04-03 | ||
| AT18502009 | 2009-11-20 | ||
| ATA1850/2009 | 2009-11-20 | ||
| PCT/EP2010/002133 WO2010112237A1 (en) | 2009-04-03 | 2010-04-02 | Driver circuit for an led |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102428754A CN102428754A (en) | 2012-04-25 |
| CN102428754B true CN102428754B (en) | 2015-07-08 |
Family
ID=42270528
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201080019793.1A Expired - Fee Related CN102428754B (en) | 2009-04-03 | 2010-04-02 | Driver circuit for an LED |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2420108B1 (en) |
| CN (1) | CN102428754B (en) |
| WO (1) | WO2010112237A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT13857U1 (en) * | 2013-04-30 | 2014-10-15 | Tridonic Gmbh & Co Kg | Error detection for LEDs |
| CN111837460A (en) * | 2018-03-09 | 2020-10-27 | Lg伊诺特有限公司 | Lighting control device |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5680036A (en) * | 1996-03-19 | 1997-10-21 | Compaq Computer Corporation | Logarithmic power compensation for a switching power supply |
| JP4959325B2 (en) * | 2003-05-07 | 2012-06-20 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Current control method and circuit for light emitting diodes |
| US7656103B2 (en) * | 2006-01-20 | 2010-02-02 | Exclara, Inc. | Impedance matching circuit for current regulation of solid state lighting |
| US20080018261A1 (en) * | 2006-05-01 | 2008-01-24 | Kastner Mark A | LED power supply with options for dimming |
| EP2163134A2 (en) * | 2007-05-07 | 2010-03-17 | Koninklijke Philips Electronics N.V. | High power factor led-based lighting apparatus and methods |
| EP2341761B1 (en) * | 2007-06-15 | 2022-12-14 | Tridonic GmbH & Co KG | Apparatus for operating a light source, in particular LED |
| US7750616B2 (en) * | 2007-06-21 | 2010-07-06 | Green Mark Technology Inc. | Buck converter LED driver circuit |
-
2010
- 2010-04-02 CN CN201080019793.1A patent/CN102428754B/en not_active Expired - Fee Related
- 2010-04-02 EP EP10719585.1A patent/EP2420108B1/en active Active
- 2010-04-02 WO PCT/EP2010/002133 patent/WO2010112237A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| CN102428754A (en) | 2012-04-25 |
| EP2420108A1 (en) | 2012-02-22 |
| WO2010112237A1 (en) | 2010-10-07 |
| EP2420108B1 (en) | 2020-07-15 |
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