CN203884059U - LED driving device and controller thereof - Google Patents
LED driving device and controller thereof Download PDFInfo
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- CN203884059U CN203884059U CN201420318124.XU CN201420318124U CN203884059U CN 203884059 U CN203884059 U CN 203884059U CN 201420318124 U CN201420318124 U CN 201420318124U CN 203884059 U CN203884059 U CN 203884059U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The utility model discloses a LED drive arrangement and controller thereof. The controller includes a dimming mode detection circuit, a bleed control circuit, and a switch control circuit. The dimming mode detection circuit compares a rising time required for the voltage sampling signal to increase from the second threshold voltage to the first threshold voltage with a first time threshold to determine whether the LED driving device is connected to the front-cut dimmer, compares a falling time required for the voltage sampling signal to decrease from the third threshold voltage to the fourth threshold voltage with a second time threshold to determine whether the LED driving device is connected to the rear-cut dimmer, and generates a rear-cut dimming mode signal, a front-cut dimming mode signal, and a no-dimming mode signal according to the determination result. The bleed-off control circuit generates a bleed-off control signal based on the voltage sampling signal to control the bleed-off circuit. The switch control circuit generates a switch control signal to control the switching converter based on the back-cut dimming mode signal, the front-cut dimming mode signal, and the no dimming mode signal.
Description
Technical field
Embodiment of the present utility model relates to electronic circuit, especially, relates to LED drive unit and controller thereof.
Background technology
Nowadays, with LED (light-emitting diode), replacing the main trend that traditional incandescent lamp has become lighting technology development, is a difficult problem yet how to make LED drive unit and the dimmer compatibility in tradition application.
Conventional dimmer has two kinds: front cut dimmer (leading edge dimmer) and after cut dimmer (trailing edge dimmer).In some cases, dimmer can be removed, now LED drive unit be not attached to any dimmer.That is to say, have three kinds of different light modulation situations: front cut light modulation, after cut light modulation and without light modulation.Because the operation principle of each light modulation situation is completely different, if LED drive unit can not be distinguished these light modulation situations and work in as required different patterns, it can not realize the compatibility with dimmer well.The performance of LED drive unit will affect adversely, and even may cause LED flicker.
Existing light-modulating mode detection scheme is conventionally based on digital technology, its complex structure and with high costs.
Utility model content
Consider a problem of the prior art or a plurality of problem, proposed a kind of simple LED drive unit and controller thereof efficiently.
A kind of controller for LED drive unit proposing according to the utility model embodiment, this LED drive unit is included in the rectifier bridge that output provides DC bus-bar voltage, be coupled in rectification bridge output end and with reference to the bus capacitor between ground, for bus capacitor provides the leadage circuit of leakage current, and DC bus-bar voltage is converted to and drives signal with the switch converters of driving LED, this control circuit comprises: light-modulating mode testing circuit, reception represents the voltage sampling signal of DC bus-bar voltage, voltage sampling signal is increased to the required rise time of first threshold voltage and very first time threshold value comparison is cut dimmer to judge before whether LED drive unit is connected to from Second Threshold voltage, voltage sampling signal is decreased to required fall time of the 4th threshold voltage and the second time threshold from the 3rd threshold voltage to be compared to judge after whether LED drive unit is connected to and cuts dimmer, and according to cutting light-modulating mode signal after judged result generation indication LED drive unit mode of operation, before cut light-modulating mode signal, with without light-modulating mode signal, the control circuit of releasing, receiver voltage sampled signal, and produce based on voltage sampling signal the control signal of releasing, with controlled discharge circuit, and ON-OFF control circuit, be electrically coupled to light-modulating mode testing circuit, based on after cut light-modulating mode signal, frontly cut light-modulating mode signal and produce switch controlling signal without light-modulating mode signal, with control switch converter.
In one embodiment, if light-modulating mode testing circuit in default duration, all do not detect before LED drive unit is connected to, cut dimmer or after cut dimmer, judge that LED drive unit is not connected to dimmer.
In one embodiment, the control circuit of releasing is coupled to light-modulating mode testing circuit and cuts light-modulating mode signal after receiving, and based on after cut light-modulating mode signal, after cut under light-modulating mode leadage circuit enabled, front cutting light-modulating mode and without leadage circuit is invalid under light-modulating mode.
In one embodiment, leadage circuit when voltage sampling signal is decreased to the 3rd threshold voltage for bus capacitor provides leakage current, until DC bus-bar voltage reaches the 4th threshold voltage.
In one embodiment, light-modulating mode testing circuit comprises: the first comparator, there is first input end, the second input and output, first input end receiver voltage sampled signal wherein, the second input receives first threshold voltage, the first comparator compares voltage sampling signal and first threshold voltage, at output, produces the first comparison signal, the second comparator, there is first input end, the second input and output, first input end receiver voltage sampled signal wherein, the second input receives Second Threshold voltage, the second comparator compares voltage sampling signal and Second Threshold voltage, at output, produces the second comparison signal, the first timing comparison circuit, there is first input end, the second input and output, the output that wherein first input end is coupled to the first comparator is to receive the first comparison signal, the second input is coupled to the output of the second comparator to receive the second comparison signal, the rise time of the first timing comparison circuit based on the first comparison signal and the second comparison signal calculating voltage sampled signal, and rise time and very first time threshold value are compared, before producing, output cuts detection signal, the 3rd comparator, have first input end, the second input and output, wherein first input end receives the 3rd threshold voltage, the second input receiver voltage sampled signal, the 3rd comparator compares voltage sampling signal and the 3rd threshold voltage, at output, produces the 3rd comparison signal, the 4th comparator, have first input end, the second input and output, wherein first input end receives the 4th threshold voltage, the second input receiver voltage sampled signal, the 4th comparator compares voltage sampling signal and the 4th threshold voltage, at output, produces the 4th comparison signal, the second timing comparison circuit, there is first input end, the second input and output, the output that wherein first input end is coupled to the 3rd comparator is to receive the 3rd comparison signal, the second input is coupled to the output of the 4th comparator to receive the 4th comparison signal, the fall time of the second timing comparison circuit based on the 3rd comparison signal and the 4th comparison signal calculating voltage sampled signal, and fall time and the second time threshold are compared, after producing, output cuts detection signal, mode signal produces circuit, there is first input end, the second input, the 3rd input, the first output, the second output and the 3rd output, wherein first input end receives enabling signal, the second input is coupled to the output of the first timing comparison circuit and cuts detection signal before receiving, the 3rd input is coupled to the output of the second timing comparison circuit and cuts detection signal after receiving, mode signal produces circuit based on enabling signal, before cut detection signal and after cut detection signal, at the first output, after producing respectively, the second output and the 3rd output cut light-modulating mode signal, before cut light-modulating mode signal and without light-modulating mode signal.
In one embodiment, the control circuit of releasing has first input end, the second input, the 3rd input and output, the output that wherein first input end is coupled to the 3rd comparator is to receive the 3rd comparison signal, the second input is coupled to the output of the 4th comparator to receive the 4th comparison signal, the 3rd input is coupled to the first output of mode signal generation circuit and cuts light-modulating mode signal after receiving, release control circuit based on the 3rd comparison signal, the 4th comparison signal and after cut light-modulating mode signal, at output, produce the control signal of releasing.
A kind of LED drive unit proposing according to the utility model embodiment, comprising: rectifier bridge, there is output, and at output, provide DC bus-bar voltage; Bus capacitor, is coupled in the output of rectifier bridge and with reference between ground; Voltage sampling circuit, is coupled to the output of rectifier bridge to receive DC bus-bar voltage, produces the voltage sampling signal that represents DC bus-bar voltage; Leadage circuit, for bus capacitor provides leakage current; Switch converters, is coupled to the output of rectifier bridge, and DC bus-bar voltage is converted to and drives signal with driving LED; And the foregoing controller for LED drive unit.
In one embodiment, switch converters comprises: the transformer with armature winding and secondary winding, wherein armature winding and secondary winding all have first end and the second end, and the first end of armature winding is coupled to the output of rectifier bridge to receive DC bus-bar voltage; The first switching tube, has first end, the second end and control end, and wherein first end is coupled to the second end of primary winding; Second switch pipe, has first end, the second end and control end, and wherein first end is coupled to the second end of the first switching tube, and the second end is coupled to reference to ground, and control end is coupled to ON-OFF control circuit in controller with receiving key control signal; Continued flow switch pipe, has first end and the second end, and wherein first end is coupled to the first end of transformer secondary output winding; And output capacitor, be coupled between the second end of continued flow switch pipe and the second end of transformer secondary output winding.
In one embodiment, leadage circuit comprises: leakage current source, there is first end and the second end, and wherein first end is coupled to the second end of the first switching tube and the first end of second switch pipe; And the switching tube of releasing, there is first end, the second end and control end, wherein first end is coupled to second end in leakage current source, and the second end is coupled to reference to ground, and control end is coupled to the control circuit of releasing in controller to receive the control signal of releasing.
In one embodiment, switch converters also comprises: resistor, there is first end and the second end, and wherein first end is coupled to the output of rectifier bridge and the first end of primary winding; Capacitor, has first end and the second end, and wherein first end is coupled to the second end of resistor and the control end of the first switching tube, and the second end is coupled to reference to ground; And Zener diode, there is anode and negative electrode, wherein negative electrode is coupled to the first end of capacitor, and anode is coupled to reference to ground.
In embodiment of the present utility model, voltage sampling signal is increased to the required rise time of first threshold voltage and very first time threshold value comparison is cut dimmer to judge before whether LED drive unit is connected to from Second Threshold voltage, and voltage sampling signal is decreased to required fall time of the 4th threshold voltage and the second time threshold from the 3rd threshold voltage compares to judge after whether LED drive unit is connected to and cut dimmer.Such detection method is easy to realize and is with low cost.
Accompanying drawing explanation
Fig. 1 is according to the schematic block diagram of the LED drive unit 100 of the utility model embodiment;
Fig. 2 A is the oscillogram while cutting dimmer according to LED drive unit 100 shown in Fig. 1 of the utility model embodiment before being connected to;
Fig. 2 B is the partial enlarged drawing of voltage sampling signal Vmult shown in Fig. 2 A;
Fig. 3 A is the oscillogram while cutting dimmer according to LED drive unit 100 shown in Fig. 1 of the utility model embodiment after being connected to;
Fig. 3 B is the partial enlarged drawing of voltage sampling signal Vmult shown in Fig. 3 A;
Fig. 4 is according to the oscillogram of LED drive unit 100 shown in Fig. 1 of the utility model embodiment when not being connected to dimmer;
Fig. 5 is according to the workflow diagram of LED drive unit 100 shown in Fig. 1 of the utility model embodiment;
Fig. 6 is according to the schematic circuit of the controller for LED drive unit of the utility model embodiment;
Fig. 7 is the oscillogram while cutting dimmer according to controller shown in Fig. 6 of the utility model embodiment before LED drive unit is connected to;
Fig. 8 is the oscillogram while cutting dimmer according to controller shown in Fig. 6 of the utility model embodiment after LED drive unit is connected to;
Fig. 9 is according to the oscillogram of controller shown in Fig. 6 of the utility model embodiment when LED drive unit is not connected to dimmer;
Figure 10 is according to the schematic block diagram of the LED drive unit 1000 of the utility model embodiment.
Embodiment
To describe specific embodiment of the utility model in detail below, it should be noted that the embodiments described herein, only for illustrating, is not limited to the utility model.In the following description, in order to provide thorough understanding of the present utility model, a large amount of specific detail have been set forth.Yet, for those of ordinary skills, it is evident that: needn't adopt these specific detail to carry out the utility model.In other examples, for fear of obscuring the utility model, do not specifically describe known circuit, material or method.
In whole specification, " embodiment ", " embodiment ", " example " or mentioning of " example " are meaned: special characteristic, structure or characteristic in conjunction with this embodiment or example description are comprised at least one embodiment of the utility model.Therefore phrase " in one embodiment ", " in an embodiment ", " example " or " example ", occurring in each place of whole specification differs to establish a capital and refers to same embodiment or example.In addition, can with any suitable combination and/or sub-portfolio by specific feature, structure or property combination in one or more embodiment or example.In addition, it should be understood by one skilled in the art that the accompanying drawing providing at this is all for illustrative purposes, and accompanying drawing is not necessarily drawn in proportion.Should be appreciated that when claiming element " to be connected to " or during " being couple to " another element, it can be directly connected or coupled to another element or can have intermediary element.On the contrary, when claiming element " to be directly connected to " or during " being directly coupled to " another element, not having intermediary element.Identical Reference numeral is indicated identical element.Term "and/or" used herein comprises any and all combinations of one or more relevant projects of listing.
Fig. 1 is according to the schematic block diagram of the LED drive unit 100 of the utility model embodiment.This LED drive unit 100 comprises rectifier bridge, bus capacitor Cbus, voltage sampling circuit 101, leadage circuit 102, switch converters 103, the control circuit 104 of releasing, light-modulating mode testing circuit 105 and ON-OFF control circuit 106.Rectifier bridge receiver voltage Vdim, provides DC bus-bar voltage Vbus at output.Bus capacitor Cbus is coupled in the output of rectifier bridge and with reference between ground.In certain embodiments, voltage Vdim is the voltage that AC-input voltage Vac produces after dimmer cut.In further embodiments, dimmer is removed, and voltage Vdim equates with AC-input voltage Vac.
Voltage sampling circuit 101 is coupled to the output of rectifier bridge, sampling DC bus-bar voltage Vbus, and produce the voltage sampling signal Vmult that represents DC bus-bar voltage Vbus.In the embodiment shown in fig. 1, voltage sampling circuit 101 comprises the resitstance voltage divider being comprised of resistor R1 and R2.Leadage circuit 102 is coupled to bus capacitor Cbus, and for bus capacitor, Cbus provides leakage current.Leadage circuit 102 is cut dimmer and can normally be worked when being connected to LED drive unit after can guaranteeing.Switch converters 103 is coupled to the output of rectifier bridge, and DC bus-bar voltage Vbus is converted to and drives signal with driving LED.Although the LED of three series connection is only shown in Fig. 1, those skilled in the art are known, and LED drive unit 100 can drive the LED string that comprises arbitrary number LED, also can drive a plurality of LED strings that are connected in parallel.
The control circuit 104 of releasing is coupled to voltage sampling circuit 101 with receiver voltage sampled signal Vmult, and produces based on voltage sampling signal Vmult the control signal BLCTRL that releases, with controlled discharge circuit 102.In the embodiment shown in fig. 1, leadage circuit 102 is in parallel with bus capacitor Cbus, comprises the drain resistor Rb being connected in series and the switching tube Sb that releases, and the control signal of releasing BLCTRL is provided to the control end of the switching tube Sb that releases.
Light-modulating mode testing circuit 105 is coupled to voltage sampling circuit 101 with receiver voltage sampled signal Vmult, based on voltage sampling signal Vmult judge before whether LED drive unit is connected to, cut dimmer, after cut dimmer, or be not connected to dimmer at all, and produce indication LED drive unit mode of operation before cut light-modulating mode signal MODE_L, after cut light-modulating mode signal MODE_T and without light-modulating mode signal MODE_N.Light-modulating mode testing circuit 105 increases to the required rise time tr of first threshold voltage Vth1 and very first time threshold value TTH1 comparison by voltage sampling signal Vmult from Second Threshold voltage Vth2, to judge before whether LED drive unit is connected to, cut dimmer, and by voltage sampling signal Vmult from the 3rd threshold voltage vt h3 be decreased to the 4th threshold voltage vt h4 required fall time tf and the second time threshold TTH2 compare, to judge after whether LED drive unit is connected to, cut dimmer.If light-modulating mode testing circuit 105 in default duration, all do not detect before LED drive unit is connected to, cut dimmer or after cut dimmer, judge that LED drive unit is not connected to dimmer.
ON-OFF control circuit 106 is electrically coupled to light-modulating mode testing circuit 105, based on after cut light-modulating mode signal MODE_T, frontly cut light-modulating mode signal MODE_L and produce switch controlling signal LEDCTRL without light-modulating mode signal MODE_N, with control switch converter 103.
In certain embodiments, in order to reduce power consumption, the control circuit 104 of releasing is also coupled to light-modulating mode testing circuit 105 and cuts light-modulating mode signal MODE_T after receiving, and based on after cut light-modulating mode signal MODE_T, after cut under light-modulating mode leadage circuit 102 enabled, front cutting light-modulating mode and without leadage circuit 102 is invalid under light-modulating mode.In one embodiment, after cut under light-modulating mode, release control circuit 104 when voltage sampling signal Vmult is decreased to the 3rd threshold voltage vt h3 for bus capacitor Cbus provides leakage current, until voltage sampling signal Vmult reaches the 4th threshold voltage vt h4.
Below in conjunction with Fig. 2 A to Fig. 4, the light-modulating mode of LED drive unit 100 is detected and is described further.
Fig. 2 A is the oscillogram while cutting dimmer according to LED drive unit 100 shown in Fig. 1 of the utility model embodiment before being connected to.Fig. 2 B is the partial enlarged drawing of voltage sampling signal Vmult shown in Fig. 2 A.As shown in Figure 2 B, front cutting under the effect of dimmer, voltage sampling signal Vmult has the rising edge that a phase place changes with light modulation change in depth.With after cut light modulation or compare without light modulation situation, the front rate of climb of cutting voltage sampling signal Vmult under light modulation is faster.Light-modulating mode testing circuit 105 calculating voltage sampled signal Vmult rise to the required rise time tr of first threshold voltage Vth1 from Second Threshold voltage Vth2, and rise time tr and very first time threshold value TTH1 are compared, to judge before whether LED drive unit 100 is connected to, cut dimmer.In one embodiment, if rise time tr is less than very first time threshold value TTH1, light-modulating mode testing circuit 105 judgement LED drive units 100 are cut dimmer before being connected to, and cut light-modulating mode before LED drive unit 100 is worked in.
Fig. 3 A is the oscillogram while cutting dimmer according to LED drive unit 100 shown in Fig. 1 of the utility model embodiment after being connected to.Fig. 3 B is the partial enlarged drawing of voltage sampling signal Vmult shown in Fig. 3 A.As shown in Figure 3A, after cut dimmer conducting when AC-input voltage Vac zero passage, after controllable time delay, turn-off.After cut dimmer and close and to have no progeny, due to the existence of bus capacitor Cbus, DC bus-bar voltage Vbus slow decreasing, voltage sampling signal Vmult is slow decreasing also.When voltage sampling signal Vmult is decreased to the 3rd threshold voltage vt h3, the control circuit 104 of the releasing switching tube Sb conducting of releasing, thereby for bus capacitor Cbus provides leakage current, until voltage sampling signal Vmult is decreased to the 4th threshold voltage vt h4.Voltage sampling signal Vmult is fast-descending under the effect of leakage current.And for front cutting light modulation or without (referring to Fig. 3 B) for light modulation situation, even if there is leakage current to flow through bus capacitor Cbus, it is much slow that the decrease speed of voltage sampling signal Vmult is still wanted.Light-modulating mode testing circuit 105 calculating voltage sampled signal Vmult drop to required tf fall time of the 4th threshold voltage vt h4 from the 3rd threshold voltage vt h3, and by fall time tf and the second time threshold TTH2 compare, to judge after whether LED drive unit 100 is connected to, cut dimmer.In one embodiment, if tf fall time is less than the second time threshold TTH2, light-modulating mode testing circuit 105 judgement LED drive units 100 are cut dimmer after being connected to, and cut light-modulating mode after LED drive unit 100 is worked in.
Fig. 4 is according to the oscillogram of LED drive unit 100 shown in Fig. 1 of the utility model embodiment when not being connected to dimmer.As shown in Figure 4, when LED drive unit 100 is not connected to dimmer, voltage Vdim equals AC-input voltage Vac.Voltage sampling signal Vmult is the sine wave after rectification, and its rise and fall are all level and smooth and slow.If light-modulating mode testing circuit 105 is in default duration, all do not detect before LED drive unit is connected to, cut dimmer or after cut dimmer, for example, the rise time tr that voltage sampling signal Vmult do not detected be less than very first time threshold value TTH1 or fall time tf be less than the second time threshold TTH2, judge that LED drive unit is not connected to dimmer, and LED drive unit 100 is worked in without light-modulating mode.
Fig. 5 is according to the workflow diagram of LED drive unit 100 shown in Fig. 1 of the utility model one embodiment, comprises step S501～S507.
At step S501, LED drive unit starts.
At step S502, after entering, cut light-modulating mode and enable leadage circuit 102.
At step S503, the rise time tr of voltage sampling signal Vmult and very first time threshold value TTH1 are compared, to judge before whether LED drive unit is connected to, cut dimmer.If cut dimmer before LED drive unit is connected to, enter step S504, otherwise enter step S505.In one embodiment, if rise time tr is less than very first time threshold value TTH1, judges before LED drive unit is connected to and cut dimmer.In another embodiment, if rise time tr for example, is all less than very first time threshold value TTH1 at a plurality of (continuous 4) bus continuously in the cycle, before being connected to, side's judgement LED drive unit cuts dimmer.Wherein, the bus cycle refers to the cycle of DC bus-bar voltage Vbus, equals half of AC-input voltage Vac cycle.
At step S504, before entering, cut light-modulating mode, and invalid leadage circuit.
At step S505, by voltage sampling signal Vmult fall time tf and the second time threshold TTH2 compare, to judge after whether LED drive unit is connected to, cut dimmer.If so, to step S506, otherwise to step S507.In one embodiment, if tf fall time is less than the second time threshold TTH2, judges after LED drive unit is connected to and cut dimmer.
At step S506, after maintenance, cut light-modulating mode, and keep leadage circuit 102 to be enabled.
At step S507, judgement self-starting rises, and whether has arrived default duration (for example 32 bus cycles), be, to step S508, otherwise to step S503.
At step S508, enter without light-modulating mode, and invalid leadage circuit 102.
Fig. 6 is according to the schematic circuit of the controller for LED drive unit of the utility model embodiment.Wherein light-modulating mode testing circuit 605 comprises that comparator C OM1～COM4, the first timing comparison circuit 6051, the second timing comparison circuit 6052 and mode signal produce circuit 6053.The first comparator C OM1 has first input end, the second input and output, first input end receiver voltage sampled signal Vmult wherein, and the second input receives first threshold voltage Vth1.The first comparator C OM1 compares voltage sampling signal Vmult and first threshold voltage Vth1, at output, produces the first comparison signal CO1.The second comparator C OM2 has first input end, the second input and output, first input end receiver voltage sampled signal Vmult wherein, and the second input receives Second Threshold voltage Vth2.The second comparator C OM2 compares voltage sampling signal Vmult and Second Threshold voltage Vth2, at output, produces the second comparison signal CO2.
The first timing comparison circuit 6051 has first input end, the second input and output, the output that wherein first input end is coupled to the first comparator C OM1 is to receive the first comparison signal CO1, and the second input is coupled to the output of the second comparator C OM2 to receive the second comparison signal CO2.The first timing comparison circuit 6051 is based on the first comparison signal CO1 and the second comparison signal CO2, the rise time tr of calculating voltage sampled signal Vmult, and rise time tr and very first time threshold value TTH1 are compared, before producing, output cuts detection signal LD.
The 3rd comparator C OM3 has first input end, the second input and output, and wherein first input end receives the 3rd threshold voltage vt h3, the second input receiver voltage sampled signal Vmult.The 3rd comparator C OM3 compares voltage sampling signal Vmult and the 3rd threshold voltage vt h3, at output, produces the 3rd comparison signal CO3.The 4th comparator C OM4 has first input end, the second input and output, and wherein first input end receives the 4th threshold voltage vt h4, the second input receiver voltage sampled signal Vmult.The 4th comparator C OM4 compares voltage sampling signal Vmult and the 4th threshold voltage vt h4, at output, produces the 4th comparison signal CO4.
The second timing comparison circuit 6052 has first input end, the second input and output, the output that wherein first input end is coupled to the 3rd comparator C OM3 is to receive the 3rd comparison signal CO3, and the second input is coupled to the output of the 4th comparator C OM4 to receive the 4th comparison signal CO4.The second timing comparison circuit 6052 is based on the 3rd comparison signal CO3 and the 4th comparison signal CO4, tf fall time of calculating voltage sampled signal Vmult, and by fall time tf and the second time threshold TTH2 compare, after output produces, cut detection signal TD.
Mode signal produces circuit 6053 and has first input end, the second input, the 3rd input, the first output, the second output and the 3rd output, wherein first input end receives enabling signal INT, the second input is coupled to the output of the first timing comparison circuit 6051 and cuts detection signal LD before receiving, and the 3rd input is coupled to the output of the second timing comparison circuit 6052 and cuts detection signal TD after receiving.Mode signal produce circuit 6053 based on enabling signal INT, front cut detection signal LD and after cut detection signal TD, after the first output, the second output and the 3rd output produce respectively, cut light-modulating mode signal MODE_T, frontly cut light-modulating mode signal MODE_L and without light-modulating mode signal MODE_N.
The control circuit 604 of releasing has first input end, the second input, the 3rd input and output, the output that wherein first input end is coupled to the 3rd comparator C OM3 is to receive the 3rd comparison signal CO3, the second input is coupled to the output of the 4th comparator C OM4 to receive the 4th comparison signal CO4, and the 3rd input is coupled to the first output of mode signal generation circuit 6053 and cuts light-modulating mode signal MODE_T after receiving.Release control circuit 604 based on the 3rd comparison signal CO3, the 4th comparison signal CO4 and after cut light-modulating mode signal MODE_T, at output, produce the control signal BLCTRL that releases.In the embodiment shown in fig. 6, release control circuit comprise trigger FF1 and with door AND1.Trigger FF1 has set end S, reset terminal R and output Q, and the output that wherein set end S is coupled to the 3rd comparator C OM3 is to receive the 3rd comparison signal CO3, and reset terminal R is coupled to the output of the 4th comparator C OM4 to receive the 4th comparison signal CO4.There is first input end, the second input and output with door AND1, wherein first input end is coupled to the output Q of trigger FF1, the second input is coupled to the first output of mode signal generation circuit 6053 and cuts light-modulating mode signal MODE_T after receiving, and output provides dimming control signal BLCTRL.
ON-OFF control circuit 606 is electrically coupled to mode signal and produces circuit 6053, based on after cut light-modulating mode signal MODE_T, frontly cut light-modulating mode signal MODE_L and produce switch controlling signal LEDCTRL without light-modulating mode signal MODE_N.
Fig. 7 is the oscillogram while cutting dimmer according to controller shown in Fig. 6 of the utility model embodiment before LED drive unit is connected to.As shown in Figure 7, when LED drive unit has just started, under the effect of enabling signal INT, after to cut light-modulating mode signal MODE_T be high level, before cut light-modulating mode signal MODE_L and be low level without light-modulating mode signal MODE_N, after LED drive unit works in, cut light-modulating mode.When mode signal produces circuit 6053 based on front cutting detection signal LD, the rise time tr of voltage sampling signal Vmult detected when continuous 4 buses are all less than very first time threshold value TTH1 in the cycle, before cut light-modulating mode signal MODE_L and become high level, after cut light-modulating mode signal MODE_T and become low level without light-modulating mode signal MODE_N, before LED drive unit enters, cut light-modulating mode.
Fig. 8 is the oscillogram while cutting dimmer according to controller shown in Fig. 6 of the utility model embodiment after LED drive unit is connected to.As shown in Figure 8, when LED drive unit has just started, under the effect of enabling signal INT, after to cut light-modulating mode signal MODE_T be high level, before cut light-modulating mode signal MODE_L and be low level without light-modulating mode signal MODE_N, after LED drive unit works in, cut light-modulating mode.Because tf fall time of voltage sampling signal Vmult is less than the second time threshold TTH2, after cut under the effect of detection signal TD, after cut light-modulating mode signal MODE_T and keep high level, before cut light-modulating mode signal MODE_L and keep low level without light-modulating mode signal MODE_N, LED drive unit continuous firing in after cut light-modulating mode.
Fig. 9 is according to the oscillogram of controller shown in Fig. 6 of the utility model embodiment when LED drive unit is not connected to dimmer.As shown in Figure 9, when LED drive unit has just started, under the effect of enabling signal INT, after to cut light-modulating mode signal MODE_T be high level, before cut light-modulating mode signal MODE_L and be low level without light-modulating mode signal MODE_N, after LED drive unit works in, cut light-modulating mode.After 32 bus end cycles, due to before detecting, do not cut dimmer, after detecting, do not cut dimmer yet, without light-modulating mode signal, MODE_N becomes high level, before cut light-modulating mode signal MODE_L and after cut light-modulating mode signal MODE_T and be low level, LED drive unit enters without light-modulating mode.
Figure 10 is according to the schematic block diagram of the LED drive unit 1000 of the utility model embodiment.As shown in figure 10, switch converters adopts flyback topological structure, comprises transformer T1, switching tube S1, S2, diode D1 and output capacitor Cout.Transformer T1 has armature winding and secondary winding, and wherein armature winding and secondary winding all have first end and the second end, and the first end of armature winding is coupled to the output of rectifier bridge to receive DC bus-bar voltage Vbus.The first switching tube S1 has first end, the second end and control end, and wherein first end is coupled to the second end of primary winding.Second switch pipe S2 has first end, the second end and control end, and wherein first end is coupled to the second end of the first switching tube S1, and the second end is coupled to reference to ground, and control end couples ON-OFF control circuit 1006 with receiving key control signal LEDCTRL.
Diode D1 has anode and negative electrode, and its Anodic is coupled to the first end of transformer secondary output winding.Output capacitor Cout is coupled between the negative electrode of diode D1 and the second end of transformer secondary output winding.Although the embodiment shown in Figure 10 carries out afterflow as continued flow switch pipe to flowing through the electric current of transformer T1 by diode D1, those skilled in the art are known, and diode D1 also can for example, be replaced by other controlled tr tubes (MOSFET).
Leadage circuit 1002 comprises leakage current source Ib and the switching tube Sb that releases.Leakage current source Ib has first end and the second end, and wherein first end is coupled to the second end of the first switching tube S1 and the first end of second switch pipe S2.The switching tube Sb that releases has first end, the second end and control end, and wherein first end is coupled to the second end of leakage current source Ib, and the second end is coupled to reference to ground, and control end is coupled to the control circuit 1004 of releasing to receive the control signal BLCTRL that releases.
In one embodiment, the switch converters shown in Figure 10 1000 also comprises resistor R3, capacitor C1 and Zener diode ZD1.Resistor R3 has first end and the second end, and wherein first end is coupled to the output of rectifier bridge and the first end of primary winding.Capacitor C1 has first end and the second end, and wherein first end is coupled to the second end of resistor R3 and the control end of the first switching tube S1, and the second end is coupled to reference to ground.Zener diode ZD1 has anode and negative electrode, and wherein negative electrode is coupled to the first end of capacitor C1, and anode is coupled to reference to ground.
Release that switching tube Sb and second switch pipe S2 are coupled in the first switching tube S1 and with reference between ground, without bearing high voltage.Therefore, in certain embodiments, leadage circuit 1002, the control circuit 1004 of releasing, light-modulating mode testing circuit 1005, ON-OFF control circuit 1006 and second switch pipe S2 are fabricated on same semiconductor chip.
Although described the utility model with reference to several exemplary embodiments, should be appreciated that term used is explanation and exemplary and nonrestrictive term.Because the utility model can specifically be implemented in a variety of forms and not depart from spirit or the essence of utility model, so be to be understood that, above-described embodiment is not limited to any aforesaid details, and explain widely in the spirit and scope that should limit in the claim of enclosing, therefore fall into whole variations in claim or its equivalent scope and remodeling and all should be the claim of enclosing and contain.
Claims (10)
1. the controller for LED drive unit, this LED drive unit is included in output provides the rectifier bridge of DC bus-bar voltage, be coupled in rectification bridge output end and the leadage circuit of leakage current be provided and DC bus-bar voltage is converted to and drives signal with the switch converters of driving LED with reference to the bus capacitor between ground, for bus capacitor, it is characterized in that, this control circuit comprises:
Light-modulating mode testing circuit, reception represents the voltage sampling signal of DC bus-bar voltage, voltage sampling signal is increased to the required rise time of first threshold voltage and very first time threshold value comparison is cut dimmer to judge before whether LED drive unit is connected to from Second Threshold voltage, voltage sampling signal is decreased to required fall time of the 4th threshold voltage and the second time threshold from the 3rd threshold voltage to be compared to judge after whether LED drive unit is connected to and cuts dimmer, and according to cutting light-modulating mode signal after judged result generation indication LED drive unit mode of operation, before cut light-modulating mode signal, with without light-modulating mode signal,
The control circuit of releasing, receiver voltage sampled signal, and produce based on voltage sampling signal the control signal of releasing, with controlled discharge circuit; And
ON-OFF control circuit, is electrically coupled to light-modulating mode testing circuit, based on after cut light-modulating mode signal, frontly cut light-modulating mode signal and produce switch controlling signal without light-modulating mode signal, with control switch converter.
2. controller as claimed in claim 1, is characterized in that, if light-modulating mode testing circuit in default duration, all do not detect before LED drive unit is connected to, cut dimmer or after cut dimmer, judge that LED drive unit is not connected to dimmer.
3. controller as claimed in claim 1, it is characterized in that, the control circuit of releasing is coupled to light-modulating mode testing circuit and cuts light-modulating mode signal after receiving, and based on after cut light-modulating mode signal, after cut under light-modulating mode leadage circuit enabled, front cutting light-modulating mode and without leadage circuit is invalid under light-modulating mode.
4. controller as claimed in claim 1, is characterized in that, leadage circuit when voltage sampling signal is decreased to the 3rd threshold voltage for bus capacitor provides leakage current, until DC bus-bar voltage reaches the 4th threshold voltage.
5. controller as claimed in claim 1, is characterized in that, light-modulating mode testing circuit comprises:
The first comparator, there is first input end, the second input and output, first input end receiver voltage sampled signal wherein, the second input receives first threshold voltage, the first comparator compares voltage sampling signal and first threshold voltage, at output, produces the first comparison signal;
The second comparator, there is first input end, the second input and output, first input end receiver voltage sampled signal wherein, the second input receives Second Threshold voltage, the second comparator compares voltage sampling signal and Second Threshold voltage, at output, produces the second comparison signal;
The first timing comparison circuit, there is first input end, the second input and output, the output that wherein first input end is coupled to the first comparator is to receive the first comparison signal, the second input is coupled to the output of the second comparator to receive the second comparison signal, the rise time of the first timing comparison circuit based on the first comparison signal and the second comparison signal calculating voltage sampled signal, and rise time and very first time threshold value are compared, before producing, output cuts detection signal;
The 3rd comparator, have first input end, the second input and output, wherein first input end receives the 3rd threshold voltage, the second input receiver voltage sampled signal, the 3rd comparator compares voltage sampling signal and the 3rd threshold voltage, at output, produces the 3rd comparison signal;
The 4th comparator, have first input end, the second input and output, wherein first input end receives the 4th threshold voltage, the second input receiver voltage sampled signal, the 4th comparator compares voltage sampling signal and the 4th threshold voltage, at output, produces the 4th comparison signal;
The second timing comparison circuit, there is first input end, the second input and output, the output that wherein first input end is coupled to the 3rd comparator is to receive the 3rd comparison signal, the second input is coupled to the output of the 4th comparator to receive the 4th comparison signal, the fall time of the second timing comparison circuit based on the 3rd comparison signal and the 4th comparison signal calculating voltage sampled signal, and fall time and the second time threshold are compared, after producing, output cuts detection signal;
Mode signal produces circuit, there is first input end, the second input, the 3rd input, the first output, the second output and the 3rd output, wherein first input end receives enabling signal, the second input is coupled to the output of the first timing comparison circuit and cuts detection signal before receiving, the 3rd input is coupled to the output of the second timing comparison circuit and cuts detection signal after receiving, mode signal produces circuit based on enabling signal, before cut detection signal and after cut detection signal, at the first output, after producing respectively, the second output and the 3rd output cut light-modulating mode signal, before cut light-modulating mode signal and without light-modulating mode signal.
6. controller as claimed in claim 5, it is characterized in that, the control circuit of releasing has first input end, the second input, the 3rd input and output, the output that wherein first input end is coupled to the 3rd comparator is to receive the 3rd comparison signal, the second input is coupled to the output of the 4th comparator to receive the 4th comparison signal, the 3rd input is coupled to the first output of mode signal generation circuit and cuts light-modulating mode signal after receiving, release control circuit based on the 3rd comparison signal, the 4th comparison signal and after cut light-modulating mode signal, at output, produce the control signal of releasing.
7. a LED drive unit, is characterized in that, comprising:
Rectifier bridge, has output, at output, provides DC bus-bar voltage;
Bus capacitor, is coupled in the output of rectifier bridge and with reference between ground;
Voltage sampling circuit, is coupled to the output of rectifier bridge to receive DC bus-bar voltage, produces the voltage sampling signal that represents DC bus-bar voltage;
Leadage circuit, for bus capacitor provides leakage current;
Switch converters, is coupled to the output of rectifier bridge, and DC bus-bar voltage is converted to and drives signal with driving LED; And
The controller for LED drive unit as described in any one in claim 1 to 6.
8. LED drive unit as claimed in claim 7, is characterized in that, switch converters comprises:
The transformer with armature winding and secondary winding, wherein armature winding and secondary winding all have first end and the second end, and the first end of armature winding is coupled to the output of rectifier bridge to receive DC bus-bar voltage;
The first switching tube, has first end, the second end and control end, and wherein first end is coupled to the second end of primary winding;
Second switch pipe, has first end, the second end and control end, and wherein first end is coupled to the second end of the first switching tube, and the second end is coupled to reference to ground, and control end is coupled to ON-OFF control circuit in controller with receiving key control signal;
Continued flow switch pipe, has first end and the second end, and wherein first end is coupled to the first end of transformer secondary output winding; And
Output capacitor, is coupled between the second end of continued flow switch pipe and the second end of transformer secondary output winding.
9. LED drive unit as claimed in claim 8, is characterized in that, leadage circuit comprises:
Leakage current source, has first end and the second end, and wherein first end is coupled to the second end of the first switching tube and the first end of second switch pipe; And
The switching tube of releasing, has first end, the second end and control end, and wherein first end is coupled to second end in leakage current source, and the second end is coupled to reference to ground, and control end is coupled to the control circuit of releasing in controller to receive the control signal of releasing.
10. LED drive unit as claimed in claim 8, is characterized in that, switch converters also comprises:
Resistor, has first end and the second end, and wherein first end is coupled to the output of rectifier bridge and the first end of primary winding;
Capacitor, has first end and the second end, and wherein first end is coupled to the second end of resistor and the control end of the first switching tube, and the second end is coupled to reference to ground; And
Zener diode, has anode and negative electrode, and wherein negative electrode is coupled to the first end of capacitor, and anode is coupled to reference to ground.
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| CN201420318124.XU CN203884059U (en) | 2014-06-13 | 2014-06-13 | LED driving device and controller thereof |
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| CN201420318124.XU CN203884059U (en) | 2014-06-13 | 2014-06-13 | LED driving device and controller thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107046751A (en) * | 2017-05-27 | 2017-08-15 | 深圳市明微电子股份有限公司 | A kind of linear constant current LED drive circuit, driving chip and drive device |
| CN107197561A (en) * | 2017-06-12 | 2017-09-22 | 宜昌格志科技有限公司 | A kind of LED energy saving light modulators based on straight edge line voltage signal |
| CN108260254A (en) * | 2018-02-28 | 2018-07-06 | 深圳市稳先微电子有限公司 | Switch continuous LED drive circuit, method and driving power |
| CN109246891A (en) * | 2018-09-30 | 2019-01-18 | 杰华特微电子（杭州）有限公司 | A kind of light modulator detection method, detection circuit and lighting circuit |
| CN109245504A (en) * | 2018-09-25 | 2019-01-18 | 国充充电科技江苏股份有限公司 | A kind of new energy electromechanical testing energy bleeder |
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- 2014-06-13 CN CN201420318124.XU patent/CN203884059U/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107046751A (en) * | 2017-05-27 | 2017-08-15 | 深圳市明微电子股份有限公司 | A kind of linear constant current LED drive circuit, driving chip and drive device |
| CN107197561A (en) * | 2017-06-12 | 2017-09-22 | 宜昌格志科技有限公司 | A kind of LED energy saving light modulators based on straight edge line voltage signal |
| CN108260254A (en) * | 2018-02-28 | 2018-07-06 | 深圳市稳先微电子有限公司 | Switch continuous LED drive circuit, method and driving power |
| CN108260254B (en) * | 2018-02-28 | 2020-01-07 | 深圳市稳先微电子有限公司 | LED driving circuit with continuous switch, method and driving power supply |
| CN109245504A (en) * | 2018-09-25 | 2019-01-18 | 国充充电科技江苏股份有限公司 | A kind of new energy electromechanical testing energy bleeder |
| CN109246891A (en) * | 2018-09-30 | 2019-01-18 | 杰华特微电子（杭州）有限公司 | A kind of light modulator detection method, detection circuit and lighting circuit |
| CN109246891B (en) * | 2018-09-30 | 2024-02-23 | 杰华特微电子股份有限公司 | Dimmer detection method, detection circuit and lighting circuit |
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