CN102595681A - Light emitting diode circuit having light emitting diode drive circuit and operating method thereof - Google Patents
Light emitting diode circuit having light emitting diode drive circuit and operating method thereof Download PDFInfo
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- CN102595681A CN102595681A CN2011100034517A CN201110003451A CN102595681A CN 102595681 A CN102595681 A CN 102595681A CN 2011100034517 A CN2011100034517 A CN 2011100034517A CN 201110003451 A CN201110003451 A CN 201110003451A CN 102595681 A CN102595681 A CN 102595681A
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Abstract
The invention relates to a light emitting diode (LED) circuit comprising a plurality of LED channels and an LED drive circuit. The LED drive circuit comprises a dimming module, a direct current to direct current converter, a delay module and a current absorption module, wherein the dimming module is used to generate a dimming voltage. The direct current to direct current converter contains a power amplifier and a control module, wherein the control module is used to generate a driving voltage according to the dimming voltage so as to control a grid electrode of the power amplifier and control conduction and closing of the LED channels. The delay module, which contains delay units that are in series connection, is used to carry out delay processing on the dimming voltage so as to generate delay signals that are respectively at output terminals of all the delay units. And the current absorption module that is connected to the LED channels is used to adjust conduction periods of the LED channels according to the delay signals. In addition, an operating method of the LED circuit is also disclosed.
Description
Technical field
Content of the present invention relates to a kind of circuit structure and How It Works thereof, and particularly relevant for a kind of circuit of LED and How It Works thereof with LED driving circuit.
Background technology
Light-emitting diode (light emitting diode; LED) compare down with traditional bulb illuminations, estimated efficiency is about four times of conventional bulb.And light-emitting diode does not have traditional bulb and contains poisonous mercury, more has the useful life longer than bulb.Under all factors, light-emitting diode has become the up-to-date mainstream technology of modern illumination science and technology.
When all light emitting diode string conducting simultaneously of circuit of LED dress, light emitting diode string is drawn sizable electric current with needs.If circuit of LED has light emitting diode string the more; The electric current of then required these light emitting diode string of driving is just bigger; Yet the output at drive circuit will produce big like this electric current; The probability that noise and voltage/current ripple are produced is improved, and is very unfavorable.
Therefore, how designing a circuit of LED and a How It Works thereof with LED driving circuit, to overcome above-mentioned big current problems, is industry problem demanding prompt solution for this reason.
Summary of the invention
Therefore, the one side of content of the present invention is to be to provide a kind of light-emitting diode (light emitting diode; LED) drive circuit has mild instantaneous changing the mechanism to drive a plurality of light emitting diode string (channel), comprises: light modulation (dimming) module, DC-DC converter, Postponement module and Current draw module.Light-adjusting module is in order to produce dimmer voltage.The power amplifier that DC-DC converter comprises control module and is connected in light emitting diode string; Wherein control module is in order to produce driving voltage according to dimmer voltage; With the grid of control power amplifiers, the conducting of further controlling light emitting diode string with close.Postponement module comprises the delay cell of a plurality of series connection; In order to dimmer voltage is postponed processing; Lay respectively at a plurality of inhibit signals of the output of each delay cell with generation; Wherein each delay cell comprises and postpones electric capacity and switch module, postpones electric capacity and is connected to output, and switch module carries out charge and discharge process in order to the input voltage according to delay cell to postponing electric capacity; So that produce delay between the voltage of output and input voltage with specific clock number, in order to do produce inhibit signal one of them.The Current draw module be connected to light emitting diode string one of them, with turn-on cycle according to the corresponding light emitting diode string of one of them adjustment of inhibit signal.
According to content one embodiment of the present invention, part overlaps between inhibit signal.
According to another embodiment of content of the present invention, DC-DC converter also comprises: inductance, diode and electric capacity.Inductance is coupled to first end in order to will supply voltage.Diode is connected between first end and light emitting diode string.Electric capacity is connected in light emitting diode string, and its intermediate power amplifier essence is connected in first end, according to driving voltage electric capacity is discharged and recharged.The anode tap of diode (anode) is connected to first end, and the cathode terminal of diode (cathode) is connected to electric capacity.
According to the another embodiment of content of the present invention; One of them is positioned at high-voltage level when inhibit signal; One of them is enabled the Current draw module so that one of them conducting of light emitting diode string; One of them is positioned at low voltage level when inhibit signal, and one of them is pressed down ability so that one of them not conducting of light emitting diode string the Current draw module.
Foundation content of the present invention is an embodiment again; Wherein switch module comprises high side P-type mos transistor and downside N type metal oxide semiconductor transistor; The transistorized grid of high side P-type mos transistor and downside N type metal oxide semiconductor receives input voltage, postpones electric capacity and is connected with output through inverter in fact.
The embodiment that foundation content of the present invention has more; Wherein switch module comprises high side P-type mos transistor and downside N type metal oxide semiconductor transistor; High side P-type mos transistor and the transistorized grid of downside N type metal oxide semiconductor are connected in inverter, to receive input voltage through inverter.
Embodiment according to content of the present invention has again wherein comprises first delay cell in the delay cell, the input voltage of first delay cell is a dimmer voltage, and the non-first delay cell person's input voltage is from last delay cell in the delay cell.
Content of the present invention be to be to provide a kind of circuit of LED on the other hand, comprise: a plurality of light emitting diode string and LED driving circuit.LED driving circuit comprises: light-adjusting module, DC-DC converter, Postponement module and Current draw module.Light-adjusting module is in order to produce dimmer voltage.The power amplifier that DC-DC converter comprises control module and is connected in light emitting diode string; Wherein control module is in order to produce driving voltage according to dimmer voltage; With the grid of control power amplifiers, the conducting of further controlling light emitting diode string with close.Postponement module comprises the delay cell of a plurality of series connection; In order to dimmer voltage is postponed processing; Lay respectively at a plurality of inhibit signals of the output of each delay cell with generation; Wherein each delay cell comprises and postpones electric capacity and switch module, postpones electric capacity and is connected to output, and switch module carries out charge and discharge process in order to the input voltage according to delay cell to postponing electric capacity; So that produce delay between the voltage of output and input voltage with specific clock number, in order to do produce inhibit signal one of them.The Current draw module be connected to light emitting diode string one of them, with turn-on cycle according to the corresponding light emitting diode string of one of them adjustment of inhibit signal.
According to content one embodiment of the present invention, part overlaps between inhibit signal.
According to another embodiment of content of the present invention, DC-DC converter also comprises: inductance, diode and electric capacity.Inductance is coupled to first end in order to will supply voltage.Diode is connected between first end and light emitting diode string.Electric capacity is connected in light emitting diode string, and its intermediate power amplifier essence is connected in first end, according to driving voltage electric capacity is discharged and recharged.The anode tap of diode (anode) is connected to first end, and the cathode terminal of diode (cathode) is connected to electric capacity.
According to the another embodiment of content of the present invention; One of them is positioned at high-voltage level when inhibit signal; One of them is enabled the Current draw module so that one of them conducting of light emitting diode string; One of them is positioned at low voltage level when inhibit signal, and one of them is pressed down ability so that one of them not conducting of light emitting diode string the Current draw module.
Foundation content of the present invention is an embodiment again; Wherein switch module comprises high side P-type mos transistor and downside N type metal oxide semiconductor transistor; The transistorized grid of high side P-type mos transistor and downside N type metal oxide semiconductor receives input voltage, postpones electric capacity and is connected with output through inverter in fact.
The embodiment that foundation content of the present invention has more; Wherein switch module comprises high side P-type mos transistor and downside N type metal oxide semiconductor transistor; High side P-type mos transistor and the transistorized grid of downside N type metal oxide semiconductor are connected in inverter, to receive input voltage through inverter.
Embodiment according to content of the present invention has again wherein comprises first delay cell in the delay cell, the input voltage of first delay cell is a dimmer voltage, and the non-first delay cell person's input voltage is from last delay cell in the delay cell.
The one side again of content of the present invention is to be to provide a kind of circuit of LED How It Works, comprises the following step: produce dimmer voltage; Produce driving voltage according to dimmer voltage, with the grid of the power amplifier of control circuit of LED, the conducting of further controlling a plurality of light emitting diode string with close; Delay cell through a plurality of series connection that Postponement module comprised postpones to handle to dimmer voltage; To produce a plurality of inhibit signals; Be each positioned at the output of delay cell; Each delay cell comprises delay electric capacity and the switch module that is connected in output, and the step that produces inhibit signal also comprises: receiving inputted signal is to switch module; Make switch module carry out charge and discharge process to postponing electric capacity according to input voltage; And make between voltage and the input voltage of output and produce delay with specific clock number, in order to do produce inhibit signal one of them; And according to the turn-on cycle of the corresponding light emitting diode string of one of them adjustment of inhibit signal.
According to content one embodiment of the present invention, part overlaps between inhibit signal.
According to another embodiment of content of the present invention; One of them is positioned at high-voltage level when inhibit signal; One of them is enabled a plurality of Current draw modules of circuit of LED so that one of them conducting of light emitting diode string; One of them is positioned at low voltage level when inhibit signal, and one of them is pressed down ability so that one of them not conducting of light emitting diode string the Current draw module.
The advantage of using content of the present invention is the setting that is through Postponement module; Make the light emitting diode string can be in regular turn but not conducting simultaneously; Avoid the generation of transient high-current to cause noise or voltage/current ripple, reach mild instantaneous changing the mechanism and reach above-mentioned purpose easily.
Description of drawings
For letting the above-mentioned of content of the present invention and other purpose, characteristic, advantage and the embodiment can be more obviously understandable, appended graphic explanation be following:
Fig. 1 is among the embodiment of content of the present invention, the sketch map of circuit of LED;
Fig. 2 is the sketch map of light emitting diode string, Postponement module and the Current draw module of Fig. 1;
Fig. 3 is the sketch map of the delay cell of Fig. 2;
Fig. 4 is among the embodiment of content of the present invention, the oscillogram of dimmer voltage and inhibit signal;
Fig. 5 is the sketch map of the Current draw module of Fig. 2;
Fig. 6 is among another embodiment of content of the present invention, the sketch map of the delay cell of Fig. 2; And
Fig. 7 is among content one embodiment of the present invention, a kind of flow chart of circuit of LED How It Works.
[main element label declaration]
1: circuit of LED 10: a plurality of light emitting diode string
100,102,104: light emitting diode string 12: light-adjusting module
141: with door 140: inductance
144: electric capacity 142: diode
148: power amplifier 146: control module
160,162,164: delay cell 16: Postponement module
180,182,184: Current draw module 18: a plurality of Current draw modules
34: downside N type metal oxide semiconductor crystal 30: postpone electric capacity
Pipe 32: high side P-type mos
50: the operational amplifier transistor
56: inverter 36: inverter
52,54: switch
701-704: step
Embodiment
Please with reference to Fig. 1.Fig. 1 is among the embodiment of content of the present invention, the sketch map of circuit of LED 1.Circuit of LED 1 comprises: a plurality of light emitting diode string 10 and LED driving circuit.LED driving circuit comprises: light-adjusting module 12, DC-DC converter, Postponement module 16 and a plurality of Current draw module 18 (in Fig. 1, only illustrating with a block).
DC-DC converter comprises inductance 140, diode 142, electric capacity 144, control module 146 and power amplifier 148.
In an embodiment; Control module 146 comprises error amplifier and the wide modulator of ripple (not illustrating); Wherein error amplifier produces a comparative result according to a reference voltage Vr and the feedback voltage Vfb that the voltage of light emitting diode string 10 is relevant a bit therewith, and further produces control voltage Vc according to comparative result and an oscillator signal by the wide modulator of ripple.Control voltage Vc is the form of a square wave in an embodiment.In the present embodiment, control module 146 also comprises that receive control voltage Vc and door 141 (an AND gate).
Light-adjusting module 12 can produce dimmer voltage Vdm.Above-mentioned controls the voltage Vc except receiving with door 141, also receives dimmer voltage Vdm to produce the grid of driving voltage Vd to power amplifier 148.Therefore, only when control voltage Vc and dimmer voltage Vdm were high attitude, driving voltage Vd just can be high attitude, so that power amplifier 148 conductings.And as control voltage Vc and dimmer voltage Vdm when one of them is for low state at least, driving voltage Vd is low state, and power amplifier 148 cuts out.Power amplifier 148 switches between therefore can and cutting out in conducting, so that electric capacity 144 is discharged and recharged.The charge and discharge process of electric capacity 144 then can make light emitting diode string 10 conducting according to this or close.18 of each Current draw modules be connected to light emitting diode string one of them, so that voltage stabilizing mechanism to be provided.
Yet when the string number of these a little light emitting diode string in the circuit of LED 1 increased, the electric current that need drive these light emitting diode string 10 simultaneously correspondingly increased.Big electric current will cause noise and voltage/current ripple at the first end P easily, is unfavorable result.
Therefore, the Postponement module in the present embodiment 16 provides mild instantaneous changing the mechanism.Please with reference to Fig. 2.Fig. 2 is the sketch map of several light emitting diode string 10, Postponement module 16 and Current draw module 18.
For the enforcement aspect to content of the present invention is clearly explained, in several light emitting diode string 10 among Fig. 2, be that example describes only with three light emitting diode string 100,102 and 104.In other embodiment, the number of the light-emitting diode that comprises in the string number of these a little light emitting diode string 10 and each light emitting diode string can be adjusted according to circumstances.Therefore, Postponement module 16 comprises three delay cells that are in series 160,162 and 164 in present embodiment, then comprises three Current draw modules 180,182 and 184 in these a little Current draw modules 18.Each Current draw module 180,182 and 184 is connected to light emitting diode string 100,102 and 104.Be noted that, light-adjusting module 12, in Fig. 2, do not illustrate with door 141, control module 146 and power amplifier 148.Yet in fact, Postponement module 16 is as shown in Figure 1, is connected with light-adjusting module 16.
Please be simultaneously with reference to Fig. 3.Fig. 3 is the sketch map of delay cell 160.Delay cell 160 comprises delay electric capacity 30, switch module and the inverter 36 that is connected in output Out.Switch module comprises high side P-type mos transistor 32 and downside N type metal oxide semiconductor transistor 34 in present embodiment.The grid of high side P-type mos transistor 32 and downside N type metal oxide semiconductor transistor 34 is in order to receive input voltage vin.First delay cell 160 in Postponement module 16, its input voltage vin is dimmer voltage Vdm.And concerning the delay cell 162 and 164 of other non-first delay cells 160, its input voltage vin is the output voltage from previous stage.That is the input voltage vin of delay cell 162 comes from the output of delay cell 160, and the input voltage vin of delay cell 164 comes from the output of delay cell 162.
Concerning delay cell 160; Receiving input voltage vin; That is behind the dimmer voltage Vdm, high side P-type mos transistor 32 and downside N type metal oxide semiconductor transistor 34 will carry out charge or discharge to postponing electric capacity 30 with the voltage running of its grid.In present embodiment, when dimmer voltage Vdm becomes low state, 32 conductings of high side P-type mos transistor, and little by little charge to postponing electric capacity 30.After a specific time, postpone electric capacity 30 and will arrive high level, be connected the inverter 36 that postpones between electric capacity 30 and output Out and will further make the voltage of output Out transfer low state to.Yet, owing to need the time to postponing electric capacity 30 chargings, thus the voltage of output Out will and the dimmer voltage Vdm of input between the delay of a specific clock number of generation.
Similarly, when dimmer voltage Vdm transfers high attitude to, downside N type metal oxide semiconductor transistor 34 postpones electric capacity 30 discharges with conducting to make gradually.Behind a special time, postpone electric capacity 30 and will be discharged to low level, inverter 36 will further make the voltage of output Out transfer high attitude to.Because delay cell 160,162 in the Postponement module 16 and 164 forms for series connection, the inhibit signal D1, D2 and the D3 that are therefore produced by delay cell 160,162 and 164 respectively have at a distance of the more and more big phase delay result of dimmer voltage Vdm.
Please with reference to Fig. 4.Fig. 4 is the oscillogram of dimmer voltage Vdm and inhibit signal D1, D2 and D3.As shown in Figure 4, each relative dimmer voltage Vdm has a specific time of delay owing to the running of switch module and delay electric capacity for inhibit signal D1, D2 and D3.
Please with reference to Fig. 5.Fig. 5 is the sketch map of Current draw module 180.Current draw module 180 comprises operational amplifier 50, switch 52 and switch 54.Switch 52 when light emitting diode string 100 conductings of correspondence, self-luminous diode string 100 received current I1.The grid of operational amplifier 50 control switchs 52 is to provide stable effect to electric current I 1.Switch 54 also is connected to the grid of switch 52.Yet, switch 54 self-dalay unit 160 receive delay signal D1, therefore as inhibit signal D1 during in low level, inverter 56 will receive inhibit signal D1 so that switch 54 is opened, and in order to do the grid voltage that drags down switch 52, and then switch 52 cut out.Therefore, Current draw module 180 will be pressed down ability, so that light emitting diode string 100 can't conducting.As inhibit signal D1 during at high-low level, inverter 56 will receive inhibit signal D1 so that switch 54 cuts out, and then switch 52 is opened.So that light emitting diode string 100 running as usual.
Be connected in the power amplifier of light emitting diode string; Wherein control module is in order to produce driving voltage according to dimmer voltage; Grid with control power amplifiers; Further the conducting of control light emitting diode string with close, its intermediate power amplifier essence is connected in first end, according to driving voltage electric capacity is discharged and recharged.
Therefore; When driving voltage Vd according to the power amplifier 148 in the dimmer voltage Vdm control chart 1 to let its control during these light emitting diode string 10 conductings, the light emitting diode string 100 among Fig. 2, light emitting diode string 102 light emitting diode string 104 will be according to inhibit signal D1, D2 and D3 conductings in regular turn.Therefore, the total current that is supplied to these light emitting diode string 10 will increase gradually but not moment increases.Therefore noise that big electric current will cause or ripple will be suppressed.Be noted that; As shown in Figure 4; Inhibit signal D1, D2 and D3 overlap part; So that light emitting diode string 100, the conducting apace one by one of light emitting diode string 102 light emitting diode string 104 present a mild and continuous curve so that be supplied to the electric current of these light emitting diode string 10.
Please with reference to Fig. 6.Fig. 6 is among another embodiment of content of the present invention, the sketch map of delay cell 160.In present embodiment, inverter 36 is to be provided with the reception input voltage vin, and output is with the grid of the high side P-type mos of further control transistor 32 and downside N type metal oxide semiconductor transistor 34.Therefore in present embodiment, when dimmer voltage Vdm becomes low state, inverter 36 will make 34 conductings of downside N type metal oxide semiconductor transistor, postpone electric capacity 30 discharges to make gradually.Behind a special time, postpone electric capacity 30 and will be discharged to low level, make the voltage of output Out become low state.On the contrary, when dimmer voltage Vdm transfers high attitude to, inverter 36 will make 32 conductings of high side P-type mos transistor, and little by little charge to postponing electric capacity 30.After a specific time, postpone electric capacity 30 and will arrive high level, make the voltage of output Out become high attitude.The delay cell 160 that Fig. 6 illustrated can reach and the operational effect identical like delay cell that Fig. 3 illustrated 160.
Please with reference to Fig. 7.Fig. 7 is among content one embodiment of the present invention, a kind of flow chart of circuit of LED How It Works.In the circuit of LED 1 that the circuit of LED How It Works can be applicable to illustrate like Fig. 1.The circuit of LED How It Works comprise the following step (should be appreciated that mentioned step in this execution mode except that chatting bright its order person especially, all can be adjusted order before and after it according to actual needs, in addition can be simultaneously or part carry out simultaneously).
In step 701, produce dimmer voltage Vdm by light-adjusting module 12.Then in step 702, control module 146 produces driving voltage Vd according to dimmer voltage Vdm, with the grid of the power amplifier 148 of control circuit of LED 1, the conducting of further controlling a plurality of light emitting diode string 10 with close.
In step 703; 160,162 and 164 couples of dimmer voltage Vdm of delay cell of a plurality of series connection that comprised through Postponement module 16 postpone to handle; To produce a plurality of inhibit signal D1, D2 and D3, inhibit signal D1, D2 and D3 are each positioned at the output of delay cell 160,162 and 164.Wherein, the step of each delay cell 160,162 and 164 generation inhibit signal D1, D2 and D3 also comprises: receiving inputted signal Vin is to the switch module of delay cell 160,162 and 164; Make switch module carry out charge and discharge process to postponing electric capacity 30 according to input voltage vin; And make between voltage and the input voltage vin of output Out and produce delay with specific clock number, in order to do produce inhibit signal D1, D2 and D3 one of them.In step 704, according to the turn-on cycle of inhibit signal D1, D2 and these a little light emitting diode string 10 of D3 adjustment.
The advantage of using content of the present invention is the setting through Postponement module, makes the light emitting diode string can be in regular turn but not conducting simultaneously avoids the generation of transient high-current to cause noise or voltage/current ripple, reaches mild instantaneous changing the mechanism.
Though content of the present invention discloses as above with execution mode; So it is not in order to limit content of the present invention; Any those skilled in the art; In spirit that does not break away from content of the present invention and scope, when doing various changes and retouching, therefore the protection range of content of the present invention is as the criterion when looking appended the claim scope person of defining.
Claims (19)
1. LED driving circuit has mild instantaneous changing the mechanism to drive a plurality of light emitting diode string, comprises:
One light-adjusting module is in order to produce a dimmer voltage;
Flow to direct current transducer always; A power amplifier that comprises a control module and be connected in these a plurality of light emitting diode string; Wherein this control module is in order to produce a driving voltage according to this dimmer voltage; To control a grid of this power amplifier, the conducting of further controlling these a plurality of light emitting diode string with close;
One Postponement module; The delay cell that comprises a plurality of series connection; In order to this dimmer voltage is postponed processing, lay respectively at respectively a plurality of inhibit signals of an output of these a plurality of delay cells with generation, wherein respectively these a plurality of delay cells comprise one and postpone an electric capacity and a switch module; This delay electric capacity is connected to this output; This switch module carries out charge and discharge process in order to the input voltage according to this delay cell to this delay electric capacity so that produce delay between the voltage of this output and this input voltage with a specific clock number, in order to do produce these a plurality of inhibit signals one of them; And
A plurality of Current draw modules, be connected to these a plurality of light emitting diode string one of them, with each turn-on cycle according to these a plurality of light emitting diode string of one of them adjustment correspondence of this a plurality of inhibit signals.
2. LED driving circuit according to claim 1, wherein part overlaps between these a plurality of inhibit signals.
3. LED driving circuit according to claim 1, wherein this DC-DC converter also comprises:
One inductance is in order to be coupled to one first end with a supply voltage;
One diode is connected between this first end and this a plurality of light emitting diode string; And
One electric capacity is connected in this a plurality of light emitting diode string, and wherein this power amplifier essence is connected in this first end, according to this driving voltage this electric capacity is discharged and recharged.
4. LED driving circuit according to claim 3, wherein an anode tap of this diode is connected to this first end, and a cathode terminal of this diode is connected to this electric capacity.
5. LED driving circuit according to claim 1; One of them is positioned at a high-voltage level when these a plurality of inhibit signals; One of them is enabled these a plurality of Current draw modules so that this one of them conducting of a plurality of light emitting diode string; One of them is positioned at a low voltage level when these a plurality of inhibit signals, and one of them is pressed down ability so that these a plurality of one of them not conductings of light emitting diode string these a plurality of Current draw modules.
6. LED driving circuit according to claim 1; Wherein this switch module comprises a high side P-type mos transistor and a downside N type metal oxide semiconductor transistor; The transistorized grid of this high side P-type mos transistor and this downside N type metal oxide semiconductor receives this input voltage, and this postpones electric capacity and is connected with this output through an inverter in fact.
7. LED driving circuit according to claim 1; Wherein this switch module comprises a high side P-type mos transistor and a downside N type metal oxide semiconductor transistor; This high side P-type mos transistor and the transistorized grid of this downside N type metal oxide semiconductor are connected in an inverter, to receive this input voltage through this inverter.
8. LED driving circuit according to claim 1; Wherein comprise one first delay cell in these a plurality of delay cells; This input voltage of this first delay cell is this dimmer voltage, and this input voltage of non-this first delay cell person is from a last delay cell in these a plurality of delay cells.
9. circuit of LED comprises:
A plurality of light emitting diode string; And
One LED driving circuit comprises:
One light-adjusting module is in order to produce a dimmer voltage;
Flow to direct current transducer always; A power amplifier that comprises a control module and be connected in these a plurality of light emitting diode string; Wherein this control module is in order to produce a driving voltage according to this dimmer voltage; To control a grid of this power amplifier, the conducting of further controlling these a plurality of light emitting diode string with close;
One Postponement module; The delay cell that comprises a plurality of series connection; In order to this dimmer voltage is postponed processing, lay respectively at respectively a plurality of inhibit signals of an output of these a plurality of delay cells with generation, wherein respectively these a plurality of delay cells comprise one and postpone an electric capacity and a switch module; This delay electric capacity is connected to this output; This switch module carries out charge and discharge process in order to the input voltage according to this delay cell to this delay electric capacity so that produce delay between the voltage of this output and this input voltage with a specific clock number, in order to do produce these a plurality of inhibit signals one of them; And
A plurality of Current draw modules, be connected to these a plurality of light emitting diode string one of them, with each turn-on cycle according to these a plurality of light emitting diode string of one of them adjustment correspondence of this a plurality of inhibit signals.
10. circuit of LED according to claim 9, wherein part overlaps between these a plurality of inhibit signals.
11. circuit of LED according to claim 9, wherein this DC-DC converter also comprises:
One inductance is in order to be coupled to one first end with a supply voltage;
One diode is connected between this first end and this a plurality of light emitting diode string; And
One electric capacity is connected in this a plurality of light emitting diode string, and wherein this power amplifier essence is connected in this first end, according to this driving voltage this electric capacity is discharged and recharged.
12. circuit of LED according to claim 11, wherein an anode tap of this diode is connected to this first end, and a cathode terminal of this diode is connected to this electric capacity.
13. circuit of LED according to claim 9; One of them is positioned at a high-voltage level when these a plurality of inhibit signals; These a plurality of one of them corresponding person of Current draw module are enabled so that one of them the corresponding person conducting of these a plurality of light emitting diode string; One of them is positioned at a low voltage level when these a plurality of inhibit signals, and one of them corresponding person of these a plurality of Current draw modules is pressed down can be so that one of them the not conducting of corresponding person of these a plurality of light emitting diode string.
14. circuit of LED according to claim 9; Wherein this switch module comprises a high side P-type mos transistor and a downside N type metal oxide semiconductor transistor; The transistorized grid of this high side P-type mos transistor and this downside N type metal oxide semiconductor receives this input voltage, and this postpones electric capacity and is connected with this output through an inverter in fact.
15. circuit of LED according to claim 9; Wherein this switch module comprises a high side P-type mos transistor and a downside N type metal oxide semiconductor transistor; This high side P-type mos transistor and the transistorized grid of this downside N type metal oxide semiconductor are connected in an inverter, to receive this input voltage through this inverter.
16. circuit of LED according to claim 9; Wherein comprise one first delay cell in these a plurality of delay cells; This input voltage of this first delay cell is this dimmer voltage, and this input voltage of non-this first delay cell person is from the last delay cell in these a plurality of delay cells in these a plurality of delay cells.
17. a circuit of LED How It Works comprises the following step:
Produce a dimmer voltage;
Produce a driving voltage according to this dimmer voltage, with a grid of a power amplifier of controlling a circuit of LED, the conducting of further controlling a plurality of light emitting diode string with close;
The delay cell of a plurality of series connection that comprised through a Postponement module postpones to handle to this dimmer voltage; To produce a plurality of inhibit signals; Be each positioned at an output of these a plurality of delay cells; Respectively these a plurality of delay cells comprise a delay electric capacity and a switch module that is connected in this output, and the step that produces these a plurality of inhibit signals also comprises:
Receive an input signal to this switch module;
Make this switch module carry out charge and discharge process to this delay electric capacity according to this input voltage; And
Make between voltage and this input voltage of this output and produce delay with a specific clock number, in order to do produce these a plurality of inhibit signals one of them; And
Turn-on cycle according to these corresponding a plurality of light emitting diode string of one of them adjustment of these a plurality of inhibit signals.
18. circuit of LED How It Works according to claim 17, wherein part overlaps between these a plurality of inhibit signals.
19. circuit of LED How It Works according to claim 17; One of them is positioned at a high-voltage level when these a plurality of inhibit signals; One of them is enabled a plurality of Current draw modules of this circuit of LED so that one of them the corresponding person conducting of these a plurality of light emitting diode string; One of them is positioned at a low voltage level when these a plurality of inhibit signals, and one of them is pressed down ability so that one of them the not conducting of corresponding person of these a plurality of light emitting diode string these a plurality of Current draw modules.
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| CN2011100034517A CN102595681A (en) | 2011-01-10 | 2011-01-10 | Light emitting diode circuit having light emitting diode drive circuit and operating method thereof |
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| CN2011100034517A CN102595681A (en) | 2011-01-10 | 2011-01-10 | Light emitting diode circuit having light emitting diode drive circuit and operating method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103595383A (en) * | 2012-08-15 | 2014-02-19 | 原景科技股份有限公司 | Switching circuit |
| WO2015139544A1 (en) * | 2014-03-20 | 2015-09-24 | 张瓯 | Laser control circuit, control method and laser ink line device having laser control circuit |
| WO2020006990A1 (en) * | 2018-07-06 | 2020-01-09 | Shenzhen GOODIX Technology Co., Ltd. | Stacked power amplifiers using core devices |
| CN113629987A (en) * | 2021-08-03 | 2021-11-09 | 深圳市康佳壹视界商业显示有限公司 | LED screen electrical control system |
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| US20100220049A1 (en) * | 2003-07-07 | 2010-09-02 | Rohm Co., Ltd. | Load Driving Device, and Lighting Apparatus and Liquid Crystal Display Device Using the Same |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103595383A (en) * | 2012-08-15 | 2014-02-19 | 原景科技股份有限公司 | Switching circuit |
| CN103595383B (en) * | 2012-08-15 | 2016-08-10 | 原景科技股份有限公司 | On-off circuit |
| WO2015139544A1 (en) * | 2014-03-20 | 2015-09-24 | 张瓯 | Laser control circuit, control method and laser ink line device having laser control circuit |
| WO2020006990A1 (en) * | 2018-07-06 | 2020-01-09 | Shenzhen GOODIX Technology Co., Ltd. | Stacked power amplifiers using core devices |
| US10637418B2 (en) | 2018-07-06 | 2020-04-28 | Shenzhen GOODIX Technology Co., Ltd. | Stacked power amplifiers using core devices |
| CN113629987A (en) * | 2021-08-03 | 2021-11-09 | 深圳市康佳壹视界商业显示有限公司 | LED screen electrical control system |
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Application publication date: 20120718 |