CN103200730A - Current control circuit and corresponding light-emitting diode (LED) module thereof - Google Patents
Current control circuit and corresponding light-emitting diode (LED) module thereof Download PDFInfo
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- CN103200730A CN103200730A CN201210007354XA CN201210007354A CN103200730A CN 103200730 A CN103200730 A CN 103200730A CN 201210007354X A CN201210007354X A CN 201210007354XA CN 201210007354 A CN201210007354 A CN 201210007354A CN 103200730 A CN103200730 A CN 103200730A
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Abstract
The invention relates to a current control circuit and a corresponding light-emitting diode (LED) module of the current control circuit. The current control circuit comprises a voltage doubling circuit, an undervoltage switching circuit, a reference voltage supplying circuit and a current trap, wherein the voltage doubling circuit is used for providing output voltage, the undervoltage switching circuit is used for receiving the output voltage, moreover when the output voltage is larger than a preset value, the undervoltage switching circuit generates operation voltage according to the output voltage, the reference voltage supplying circuit is used for providing reference voltage, the current trap is electrically connected between supply voltage and an LED cluster and used for receiving the operation voltage and the reference voltage, and when receiving the operation voltage, the current trap determines the current intensity flowing to the LED cluster according to the reference voltage intensity. According to the current control circuit, electric connection modes different from past modes can be adopted for driving the LED cluster, and further the number of guide wires on a circuit substrate of an LED light bar is reduced.
Description
Technical field
The present invention relates to the technical field of backlight module, and be particularly related to a kind of current control circuit and corresponding light-emitting diode (LED) module thereof.
Background technology
Backlight module now generally is to adopt LED optical strip (LED light-bar) to be used as light source.Each LED optical strip all disposes a plurality of light emitting diode string (LED string) usually, and each light emitting diode string is formed by a plurality of light-emitting diode series connection.Fig. 1 is in order to illustrate the light emitting diode string driving method of prior art.In Fig. 1, indicate 110,120 and 130 and all be expressed as light emitting diode string.Light emitting diode string 110 is to be electrically connected by light-emitting diode 112,114,116 to form, and light emitting diode string 120 is to be in series by light-emitting diode 122,124,126, is to be in series by light-emitting diode 132,134,136 as for 130 of light emitting diode string.A wherein end electric connection of power supply voltage VCC of each light emitting diode string, and the other end of these three light emitting diode string is electrically connected earthing potential GND by current control circuit 140,150 respectively with 160.
Above-mentioned current control circuit 140,150 and 160 in order to control respectively by the size of light emitting diode string 110,120 and 130 electric current, so that constant by light emitting diode string 110,120 and 130 size of current maintenance.Yet, with current control circuit 140,150 and 160 be configured in light emitting diode string 110,120 and 130 and earthing potential GND between the type of drive utmost point be unfavorable for illustrating the wiring (layout) of LED optical strip with Fig. 2.
Fig. 2 is the LED optical strip corresponding to the type of drive of Fig. 1.In Fig. 2, indicate with the identical person of sign among Fig. 1 and be expressed as same item.Please refer to Fig. 2, this LED optical strip is made up of with 112～136 of light-emitting diodes circuit substrate 102, connector 170.Connector 170 and light-emitting diode 112～136 all are configured in the wherein one side of circuit substrate 102, and are electrically connected by the lead on the circuit substrate 102 (as indicating shown in 104).Connector 170 has four signal transmission connecting-legs, indicates with 171～174 respectively.Signal transmission connecting-leg 171 is electrically connected anode, the anode of light-emitting diode 122 and the anode of light-emitting diode 132 of light-emitting diode 112, and is electrically connected supply voltage VCC in order to the interface (not illustrating) by connector 170.Signal transmission connecting-leg 172,173 and 174 is electrically connected the negative electrode of light-emitting diode 116, the negative electrode of light-emitting diode 126 and the negative electrode of light-emitting diode 136 respectively, and is electrically connected current control circuit 140,150 and 160 respectively in order to the interface by connector 170.
By the wire laying mode of Fig. 2 as can be known, must be electrically connected by a plurality of leads 104 between current control circuit and the light-emitting diode, cause lead 104 too much to be not easy wiring, and and then limit the design of circuit substrate 102.When the width of circuit substrate 102 must design narrowlyer, when making wiring space on the circuit substrate 102 not enough, the safe distance that cuts circuit substrate 102 will dwindle.And if the precision that cuts is not enough, thereby when being cut to lead 104, just cause the situation of short circuit and electric leakage easily.
Summary of the invention
The invention provides a kind of current control circuit, it can adopt electric connection mode different from the past to drive light emitting diode string, and then the number of lead wires on the circuit substrate of minimizing LED optical strip.
The present invention provides two kinds of light-emitting diode (LED) modules corresponding to above-mentioned current control circuit (being LED optical strip for example) in addition.
One embodiment of the invention propose a kind of current control circuit, and it is used for light emitting diode string, and a wherein end of described light emitting diode string is electrically connected reference potential.This current control circuit includes voltage-multiplying circuit, under-voltage switching circuit, reference voltage supplies circuit and current sink.Described voltage-multiplying circuit is in order to provide output voltage.Described under-voltage switching circuit is in order to receiving above-mentioned output voltage, and when output voltage during greater than preset value, under-voltage switching circuit just produces operating voltage according to output voltage.And described reference voltage supplies circuit is in order to provide reference voltage.As for described current sink, it is in order between the other end that is electrically connected on supply voltage and above-mentioned light emitting diode string, and in order to receive operating voltage and reference voltage, and when current sink received operating voltage, current sink just determined to flow to the size of the electric current of light emitting diode string according to the size of reference voltage.
One embodiment of the invention propose a kind of light-emitting diode (LED) module in addition, and it includes circuit substrate, first light emitting diode string, second light emitting diode string and connector.Described circuit substrate has first and second, and this circuit substrate has conductive through hole.Described first light emitting diode string is formed by a plurality of first light-emitting diode series connection, and these first light-emitting diodes all are configured in the foregoing circuit surface of first base, and a wherein end of this first light emitting diode string is electrically connected above-mentioned conductive through hole.Described second light emitting diode string is formed by a plurality of second light-emitting diode series connection, and these second light-emitting diodes all are configured in the foregoing circuit surface of first base, and a wherein end of this second light emitting diode string is electrically connected above-mentioned conductive through hole.As for described connector, it also is configured in the foregoing circuit surface of first base.This connector has a plurality of signal transmission connecting-legs, and wherein a signal transmission connecting-leg is electrically connected the other end of above-mentioned first light emitting diode string, and in order to be electrically connected the first external impressed current control circuit.And another signal transmission connecting-leg wherein is electrically connected the other end of above-mentioned second light emitting diode string, and in order to be electrically connected the second external impressed current control circuit.The first above-mentioned external impressed current control circuit and the second external impressed current control circuit be all in order to electric connection of power supply voltage, and flow to the size and the size that flow to the electric current of second light emitting diode string of the electric current of first light emitting diode string respectively in order to control.
Embodiments of the invention propose another kind of light-emitting diode (LED) module again, and it includes circuit substrate, first light emitting diode string, second light emitting diode string and connector.Described circuit substrate has first and second, and this circuit substrate has first conductive through hole and second conductive through hole.Described first light emitting diode string is formed by a plurality of first light-emitting diode series connection, and these first light-emitting diodes all are configured in the foregoing circuit surface of first base, and a wherein end of this first light emitting diode string is electrically connected the first above-mentioned conductive through hole.Described second light emitting diode string is formed by a plurality of second light-emitting diode series connection, and these second light-emitting diodes all are configured in the foregoing circuit surface of first base, and a wherein end of this second light emitting diode string is electrically connected the second above-mentioned conductive through hole.As for above-mentioned connector, it also is configured in the foregoing circuit surface of first base.This connector has a plurality of signal transmission connecting-legs, and wherein a signal transmission connecting-leg is electrically connected the other end of above-mentioned first light emitting diode string, and in order to be electrically connected the first external impressed current control circuit.And another signal transmission connecting-leg wherein is electrically connected the other end of above-mentioned second light emitting diode string, and in order to be electrically connected the second external impressed current control circuit.The first above-mentioned external impressed current control circuit and the second external impressed current control circuit be all in order to electric connection of power supply voltage, and flow to the size and the size that flow to the electric current of above-mentioned second light emitting diode string of the electric current of above-mentioned first light emitting diode string respectively in order to control.
Embodiments of the invention propose a kind of current control circuit, and this kind current control circuit is in order to being configured between supply voltage and the light emitting diode string, thereby control flow to the size of the electric current of light emitting diode string.As long as the reference voltage that the current sink in the current control circuit receives is fixed, the size that flow to the electric current of light emitting diode string is so also just kept constant.Therefore, when adopting this current control circuit to be used as the external impressed current control circuit of light-emitting diode (LED) module, each signal transmission connecting-leg of connector in the light-emitting diode (LED) module all is to be used as power pin to use, use and be used as the ground connection pin without any the signal transmission connecting-leg, and a wherein end of each light emitting diode string all is to be electrically connected corresponding conductive through hole, in order to be electrically connected to metal backing (being used as the earth uses) by conductive through hole, or be electrically connected to other similar conducting objects to finish ground connection.Therefore, the circuit substrate in the light-emitting diode (LED) module just can reduce the number and wiring area of earthy lead.
For the above-mentioned of embodiments of the invention and other purposes, feature and advantage can be become apparent, preferred embodiment cited below particularly, and conjunction with figs. are described in detail below.
Description of drawings
Fig. 1 is in order to illustrate the light emitting diode string driving method of prior art.
Fig. 2 is the LED optical strip corresponding to the type of drive of Fig. 1.
Fig. 3 is in order to illustrate light emitting diode string driving method of the present invention.
Fig. 4 illustrates wherein a kind of implementation of three current control circuits shown in Figure 3 and a kind of electric connection mode wherein.
Fig. 5 is corresponding to the type of drive of Fig. 3 and light-emitting diode (LED) module corresponding to the circuit framework of Fig. 4.
Fig. 6 is the side cutaway view of circuit substrate 602.
Embodiment
Fig. 3 is in order to illustrate light emitting diode string driving method of the present invention.In Fig. 3, indicate 310,320 and 330 and all be expressed as light emitting diode string, all be expressed as current control circuit of the present invention and indicate 340,350 and 360.Above-mentioned light emitting diode string 310 is to be in series by light-emitting diode 312,314,316, and light emitting diode string 320 is to be in series by light-emitting diode 322,324,326, is to be in series by light-emitting diode 332,334,336 as for 330 of light emitting diode string.The wherein end of each light emitting diode string is electrically connected reference potential VSS, and these three light emitting diode string 310,320 and 330 the other end are passed through current control circuit 340,350 and 360 and electric connection of power supply voltage VCC respectively.
Above-mentioned current control circuit 340,350 and 360 flow to the size of light emitting diode string 310,320 and 330 electric current in order to control respectively, so that constant by light emitting diode string 310,320 and 330 size of current maintenance.
Fig. 4 illustrates wherein a kind of implementation of three current control circuits shown in Figure 3 and a kind of electric connection mode wherein.In Fig. 4, indicate with the identical person of sign among Fig. 3 and be expressed as same item.Please refer to Fig. 4, described three current control circuits 340,350 and 360 are by voltage-multiplying circuit 410, under-voltage switching circuit 430, reference voltage supplies circuit 450, and are formed with 470,490 and 510 three current sink (current sink) that indicated.Voltage-multiplying circuit 410 is in order to provide output voltage VO UT.Under-voltage switching circuit 430 is in order to receiving above-mentioned output voltage VO UT, and as output voltage VO UT during greater than preset value, under-voltage switching circuit 430 just produces operating voltage VOP according to output voltage VO UT.And reference voltage supplies circuit 450 is in order to provide reference voltage VREF.As for described each current sink, in order to be electrically connected on wherein between the end of supply voltage VCC and respective leds string, and in order to receive operating voltage VOP and reference voltage VREF, and when these current sink all received operating voltage VOP, each current sink all can determine to flow to the size of the electric current of its corresponding light emitting diode string according to the size of reference voltage VREF.
In this example, voltage-multiplying circuit 410 is made up of two operational amplifiers (indicating with 411 and 424 respectively), a NPN bipolar transistor (indicating with 416), a PNP bipolar transistor (indicating with 417), two Schottky diodes (indicating with 418 and 419 respectively), three electric capacity (indicating with 413,420 and 421 respectively) and five impedances (indicating with 412,414,415,422 and 423 respectively).
In each member of voltage-multiplying circuit 410, impedance 412 is electrically connected between the output of the negative input end of operational amplifier 411 and operational amplifier 411.Impedance 414 is electrically connected between the output of the positive input terminal of operational amplifier 411 and operational amplifier 411.A wherein end of impedance 415 is electrically connected the positive input terminal of operational amplifier 411.Electric capacity 413 is electrically connected between the other end of the negative input end of operational amplifier 411 and impedance 415.The collector electric connection of power supply voltage VCC of NPN bipolar transistor 416, and base stage is electrically connected the output of operational amplifier 411.The emitter-base bandgap grading of PNP bipolar transistor 417 is electrically connected the emitter-base bandgap grading of NPN bipolar transistor 416, and its base stage is electrically connected the output of operational amplifier 411, then is electrically connected earthing potential GND as for its collector.
And in other members of voltage-multiplying circuit 410, the anode electric connection of power supply voltage VCC of Schottky diode 418.And the anode of Schottky diode 419 is electrically connected the negative electrode of Schottky diode 418.Electric capacity 420 is electrically connected between the emitter-base bandgap grading of the negative electrode of Schottky diode 418 and NPN bipolar transistor 416.Electric capacity 421 is electrically connected between the negative electrode and earthing potential GND of Schottky diode 419.A wherein end of impedance 422 is electrically connected the negative electrode of Schottky diode 419, and in order to export aforesaid output voltage VO UT.Impedance 423 is electrically connected between the other end and earthing potential GND of impedance 422.As for operational amplifier 424, its positive input terminal is electrically connected the other end of impedance 422, and its negative input end and output all are electrically connected the other end of impedance 415.
In addition, in this example, under-voltage switching circuit 430 is made up of 431, PNP bipolar transistors 432 of a Zener diode (Zener diode) and an impedance 433.The anode electric connection of power supply voltage VCC of Zener diode 431.The emitter-base bandgap grading of PNP bipolar transistor 432 is in order to receiving output voltage VO UT, and its base stage is electrically connected the negative electrode of Zener diode 431, as for collector then in order to output function voltage VOP.And impedance 433 is electrically connected between the emitter-base bandgap grading and base stage of PNP bipolar transistor 432.
In addition, in this example, reference voltage supplies circuit 450 is by a Zener diode 452, an adjustable type voltage regulation Zener diode 453, an electric capacity 451, and is made up of 454,455,456 and 457 four impedances that indicate.Electric capacity 451 is electrically connected between supply voltage VCC and the earthing potential GND.The anode of Zener diode 452 is electrically connected earthing potential GND, and cathodic electricity connects supply voltage VCC.Adjustable type voltage regulation Zener diode 453 has puncture voltage and sets end 453-1, and the negative electrode of this adjustable type voltage regulation Zener diode 453 is set with puncture voltage and held all electric connection of power supply voltage VCC of 453-1.A wherein end electric connection of power supply voltage VCC of impedance 454.The wherein end of impedance 455 is electrically connected the other end of impedance 454, and in order to exporting aforesaid reference voltage VREF, and the other end of impedance 455 is electrically connected the anode of adjustable type voltage regulation Zener diode 453.A wherein end of impedance 456 is electrically connected the anode of adjustable type voltage regulation Zener diode 453.A wherein end of impedance 457 is electrically connected the other end of impedance 456, anode and the earthing potential GND of Zener diode 452, and the other end of impedance 457 is electrically connected reference potential VSS.
As for each current sink in this example, all realize with an impedance, an operational amplifier, a MOS transistor and a diode.As shown in Figure 4, current sink 470 is made up of with diode 474 impedance 472, operational amplifier 471, MOS transistor 473.Current sink 490 is made up of with diode 494 impedance 492, operational amplifier 491, MOS transistor 493.And current sink 510 is made up of with diode 514 impedance 512, operational amplifier 511, MOS transistor 513.
Member connected mode with current sink 470 is example, a wherein end electric connection of power supply voltage VCC of its impedance 472.The operating voltage input 471-1 of operational amplifier 471 is in order to receiving aforesaid operating voltage VOP, and its positive input terminal is electrically connected the other end of impedance 472, as for negative input end then in order to receive aforesaid reference voltage VREF.The source electrode of MOS transistor 473 is electrically connected the positive input terminal of operational amplifier 471, and drain electrode then is electrically connected the output of operational amplifier 471 in order to be electrically connected a wherein end of light emitting diode string 310 as for grid.The positive input terminal of the cathodic electricity concatenation operation amplifier 471 of diode 474, and anode is in order to be electrically connected a wherein end of light emitting diode string 310.As for current sink 490 and 512, the member connected mode of these two also has been illustrated among Fig. 4, just repeats no more at this.In addition, in Fig. 4, each impedance for example is to realize with resistance, and each MOS transistor is to realize with P type MOS transistor.In another embodiment, the drain electrode of MOS transistor 473 is electrically connected the positive input terminal of operational amplifier 471, and source electrode then is electrically connected the output of operational amplifier 471 in order to be electrically connected a wherein end of light emitting diode string 310 as for grid.
When supply voltage VCC was supplied to circuit shown in Figure 4, voltage-multiplying circuit 410 was just started working, and made the magnitude of voltage of the output voltage VO UT that it provides begin to rise.As output voltage VO UT during greater than preset value, will make 432 conductings of PNP bipolar transistor, and then make PNP bipolar transistor 432 provide operational amplifier 471, the required operating voltage VOP of 491 and 511 these threes from its collector.Because impedance 472,492 and 512 these threes' resistance is all definite value, as long as so the size of reference voltage VREF is fixed, the size that flow to each light emitting diode string 310,320 and 330 electric current is so also just kept constant.
Although in circuit shown in Figure 4, adopt three current sink, right those skilled in the art should know that the number of current sink can do variation along with the number of light emitting diode string.
Fig. 5 is for corresponding to the type of drive of Fig. 3 and light-emitting diode (LED) module (for example being LED optical strip) corresponding to the circuit framework of Fig. 4.In Fig. 5, indicate with the identical person of sign among Fig. 3 and be expressed as same item.Please refer to Fig. 5, this light-emitting diode (LED) module is made up of with 312～336 of light-emitting diodes circuit substrate 602, connector 670.Fig. 6 is the side cutaway view of circuit substrate 602.Please refer to Fig. 6, this circuit substrate 602 has first 602-1 and second 602-2, and this circuit substrate has conductive through hole 681 and 682.Referring again to Fig. 5, connector 670 and light-emitting diode 312～336 all are configured in first (indicating) of circuit substrate 602, and are electrically connected by the lead on the circuit substrate 602 (as indicating shown in 604).In addition, connector 670 has four signal transmission connecting-legs, indicates with 671～674 respectively.
Above-mentioned signal transmission connecting-leg 671 is electrically connected the anode of light-emitting diodes 332, and comes a wherein current sink in the electrical connection graph 4 in order to the interface (not illustrating) by connector 670, for example is current sink 470.Signal transmission connecting-leg 672 is electrically connected the anode of light-emitting diodes 312, and comes another current sink in the electrical connection graph 4 in order to the interface by connector 670, for example is current sink 490.And signal transmission connecting-leg 673 is electrically connected the anode of light-emitting diode 322, and comes last remaining in the electrical connection graph 4 current sink in order to the interface by connector 670, and just current sink 510.As for signal transmission connecting-leg 674, it is without any electrical connection.Thus, three light emitting diode string (indicating with 310,320 and 330 respectively) on the circuit substrate 602 just can be controlled the size of the electric current that flow to each light emitting diode string by external impressed current control circuit (current control circuit as shown in Figure 4).
In addition, the cathodic electricity of light-emitting diode 316 connects conductive through hole 681, and the negative electrode of light-emitting diode 326 all is electrically connected conductive through hole 682 with the negative electrode of light-emitting diode 336.Therefore, each light emitting diode string can be electrically connected to metal backing (being used as the earth uses) by its corresponding conductive through hole, or is electrically connected to other similar conducting objects to finish ground connection.Thus, the circuit substrate in the light-emitting diode (LED) module 602 just can reduce the number and wiring area of earthy lead.
In sum, embodiments of the invention propose a kind of current control circuit, and this kind current control circuit is in order to being configured between supply voltage and the light emitting diode string, thereby control flow to the size of the electric current of light emitting diode string.As long as the reference voltage that the current sink in the current control circuit receives is fixed, the size that flow to the electric current of light emitting diode string is so also just kept constant.Therefore, when adopting this current control circuit to be used as the external impressed current control circuit of light-emitting diode (LED) module, each signal transmission connecting-leg of connector in the light-emitting diode (LED) module all is to be used as power pin to use, use and be used as the ground connection pin without any the signal transmission connecting-leg, and a wherein end of each light emitting diode string all is to be electrically connected corresponding conductive through hole, in order to be electrically connected to metal backing (being used as the earth uses) by conductive through hole, or be electrically connected to other similar conducting objects to finish ground connection.Therefore, the circuit substrate in the light-emitting diode (LED) module just can reduce the number and wiring area of earthy lead.
The above, only be the preferred embodiments of the present invention, when not limiting scope of the invention process with this, namely the simple equivalent of doing according to claims of the present invention and invention description content generally changes and modifies, and all still belongs in the scope that patent of the present invention contains.Arbitrary embodiment of the present invention or claims must not reached the disclosed whole purposes of the present invention or advantage or characteristics in addition.In addition, summary part and title only are the usefulness of auxiliary patent document search, are not to limit interest field of the present invention.
Claims (10)
1. a current control circuit is used for light emitting diode string, and a wherein end of described light emitting diode string is electrically connected reference potential, and described current control circuit comprises:
Voltage-multiplying circuit is in order to provide output voltage;
Under-voltage switching circuit, in order to receiving described output voltage, and when described output voltage during greater than preset value, described under-voltage switching circuit just produces operating voltage according to described output voltage;
The reference voltage supplies circuit is in order to provide reference voltage; And
Current sink, between the other end that is electrically connected on supply voltage and described light emitting diode string, and in order to receive described operating voltage and described reference voltage, and when described current sink received described operating voltage, described current sink just determined to flow to the size of the electric current of described light emitting diode string according to the size of described reference voltage.
2. current control circuit as claimed in claim 1, wherein said current sink comprises:
Impedance, the one end is electrically connected described supply voltage;
Operational amplifier, its operating voltage input is in order to receive described operating voltage, and its positive input terminal is electrically connected the other end of described impedance, and negative input end is then in order to receive described reference voltage;
MOS transistor, its source electrode is electrically connected the positive input terminal of described operational amplifier, and it drains in order to be electrically connected the other end of described light emitting diode string, and its grid is electrically connected the output of described operational amplifier; And
Diode, its cathodic electricity connects the positive input terminal of described operational amplifier, and its anode is in order to be electrically connected the other end of described light emitting diode string.
3. current control circuit as claimed in claim 1, wherein said current sink comprises:
Impedance, the one end is electrically connected described supply voltage;
Operational amplifier, its operating voltage input is in order to receive described operating voltage, and its positive input terminal is electrically connected the other end of described impedance, and negative input end is then in order to receive described reference voltage;
MOS transistor, its drain electrode is electrically connected the positive input terminal of described operational amplifier, and its source electrode is in order to be electrically connected the other end of described light emitting diode string, and its grid is electrically connected the output of described operational amplifier; And
Diode, its cathodic electricity connects the positive input terminal of described operational amplifier, and its anode is in order to be electrically connected the other end of described light emitting diode string.
4. current control circuit as claimed in claim 1, wherein said under-voltage switching circuit comprises:
Zener diode, its anode is electrically connected described supply voltage;
The PNP bipolar transistor, its emitter-base bandgap grading is in order to receive described output voltage, and its base stage is electrically connected the negative electrode of described Zener diode, and its collector is in order to export described operating voltage; And
Impedance is electrically connected between the emitter-base bandgap grading and base stage of described PNP bipolar transistor.
5. current control circuit as claimed in claim 1, wherein said reference voltage supplies circuit comprises:
Electric capacity is electrically connected between described supply voltage and the earthing potential;
Zener diode, its anode is electrically connected described earthing potential, and its cathodic electricity connects described supply voltage;
Adjustable type voltage regulation Zener diode has puncture voltage and sets end, and the negative electrode of described adjustable type voltage regulation Zener diode is set end with described puncture voltage and all is electrically connected described supply voltage;
First impedance, the one end is electrically connected described supply voltage;
Second impedance, the one end is electrically connected the other end of described first impedance, and in order to export described reference voltage, the other end of described second impedance is electrically connected the anode of described adjustable type voltage regulation Zener diode;
The 3rd impedance, the one end is electrically connected the anode of described adjustable type voltage regulation Zener diode; And
The 4th impedance, one end are electrically connected anode and the described earthing potential of the other end of described the 3rd impedance, described Zener diode, and the other end of described the 4th impedance is electrically connected described reference potential.
6. current control circuit as claimed in claim 1, wherein said voltage-multiplying circuit comprises:
First operational amplifier;
First impedance is electrically connected between the output of the negative input end of described first operational amplifier and described first operational amplifier;
Second impedance is electrically connected between the output of the positive input terminal of described first operational amplifier and described first operational amplifier;
The 3rd impedance, the one end is electrically connected the positive input terminal of described first operational amplifier;
First electric capacity is electrically connected between the other end of the negative input end of described first operational amplifier and described the 3rd impedance;
The NPN bipolar transistor, its collector is electrically connected described supply voltage, and its base stage is electrically connected the output of described first operational amplifier;
The PNP bipolar transistor, its emitter-base bandgap grading is electrically connected the emitter-base bandgap grading of described NPN bipolar transistor, and its base stage is electrically connected the output of described first operational amplifier, and its collector is electrically connected earthing potential;
First Schottky diode, its anode is electrically connected described supply voltage;
Second Schottky diode, its anode is electrically connected the negative electrode of described first Schottky diode;
Second electric capacity is electrically connected between the emitter-base bandgap grading of the negative electrode of described first Schottky diode and described NPN bipolar transistor;
The 3rd electric capacity is electrically connected between the negative electrode and described earthing potential of described second Schottky diode;
The 4th impedance, the one end is electrically connected the negative electrode of described second Schottky diode, and in order to export described output voltage;
The 5th impedance is electrically connected between the other end and described earthing potential of described the 4th impedance; And
Second operational amplifier, its positive input terminal is electrically connected the other end of described the 4th impedance, and its negative input end and output all are electrically connected the other end of described the 3rd impedance.
7. light-emitting diode (LED) module comprises:
Circuit substrate have first and second, and described circuit substrate has conductive through hole;
First light emitting diode string is formed by a plurality of first light-emitting diode series connection, and described a plurality of first light-emitting diodes all are configured in described first of described circuit substrate, and a wherein end of described first light emitting diode string is electrically connected described conductive through hole;
Second light emitting diode string is formed by a plurality of second light-emitting diode series connection, and described a plurality of second light-emitting diodes all are configured in described first of described circuit substrate, and a wherein end of described second light emitting diode string is electrically connected described conductive through hole; And
Connector, be configured in described first of described circuit substrate, described connector has a plurality of signal transmission connecting-legs, and wherein a signal transmission connecting-leg is electrically connected the other end of described first light emitting diode string, and in order to be electrically connected the first external impressed current control circuit, another signal transmission connecting-leg wherein is electrically connected the other end of described second light emitting diode string, and in order to be electrically connected the second external impressed current control circuit
The wherein said first external impressed current control circuit and the described second external impressed current control circuit be all in order to electric connection of power supply voltage, and flow to the size and the size that flow to the electric current of described second light emitting diode string of the electric current of described first light emitting diode string respectively in order to control.
8. light-emitting diode (LED) module as claimed in claim 7, wherein each external impressed current control circuit comprises:
Voltage-multiplying circuit is in order to provide output voltage;
Under-voltage switching circuit, in order to receiving described output voltage, and when described output voltage during greater than preset value, described under-voltage switching circuit just produces operating voltage according to described output voltage;
The reference voltage supplies circuit is in order to provide reference voltage; And
Current sink, between the other end that is electrically connected on described supply voltage and described first light emitting diode string, or be electrically connected between the other end of described supply voltage and described second light emitting diode string, described current sink is also in order to receive described operating voltage and described reference voltage, and when described current sink received described operating voltage, described current sink just determined to flow to the size of the electric current of described first light emitting diode string or described second light emitting diode string according to the size of described reference voltage.
9. light-emitting diode (LED) module comprises:
Circuit substrate have first and second, and described circuit substrate has first conductive through hole and second conductive through hole;
First light emitting diode string is formed by a plurality of first light-emitting diode series connection, and described a plurality of first light-emitting diodes all are configured in described first of described circuit substrate, and a wherein end of described first light emitting diode string is electrically connected described first conductive through hole;
Second light emitting diode string is formed by a plurality of second light-emitting diode series connection, and described a plurality of second light-emitting diodes all are configured in described first of described circuit substrate, and a wherein end of described second light emitting diode string is electrically connected described second conductive through hole; And
Connector, be configured in described first of described circuit substrate, described connector has a plurality of signal transmission connecting-legs, and wherein a signal transmission connecting-leg is electrically connected the other end of described first light emitting diode string, and in order to be electrically connected the first external impressed current control circuit, another signal transmission connecting-leg wherein is electrically connected the other end of described second light emitting diode string, and in order to be electrically connected the second external impressed current control circuit
The wherein said first external impressed current control circuit and the described second external impressed current control circuit be all in order to electric connection of power supply voltage, and flow to the size and the size that flow to the electric current of described second light emitting diode string of the electric current of described first light emitting diode string respectively in order to control.
10. light-emitting diode (LED) module as claimed in claim 9, wherein each external impressed current control circuit comprises:
Voltage-multiplying circuit is in order to provide output voltage;
Under-voltage switching circuit, in order to receiving described output voltage, and when described output voltage during greater than preset value, described under-voltage switching circuit just produces operating voltage according to described output voltage;
The reference voltage supplies circuit is in order to provide reference voltage; And
Current sink, between the other end that is electrically connected on described supply voltage and described first light emitting diode string, or be electrically connected between the other end of described supply voltage and described second light emitting diode string, described current sink is also in order to receive described operating voltage and described reference voltage, and when described current sink received described operating voltage, described current sink just determined to flow to the size of the electric current of described first light emitting diode string or described second light emitting diode string according to the size of described reference voltage.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210007354XA CN103200730A (en) | 2012-01-06 | 2012-01-06 | Current control circuit and corresponding light-emitting diode (LED) module thereof |
| TW101134355A TW201330698A (en) | 2012-01-06 | 2012-09-19 | Current control circuit and its corresponding LED module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210007354XA CN103200730A (en) | 2012-01-06 | 2012-01-06 | Current control circuit and corresponding light-emitting diode (LED) module thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103200730A true CN103200730A (en) | 2013-07-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210007354XA Pending CN103200730A (en) | 2012-01-06 | 2012-01-06 | Current control circuit and corresponding light-emitting diode (LED) module thereof |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN103200730A (en) |
| TW (1) | TW201330698A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020215491A1 (en) * | 2019-04-23 | 2020-10-29 | 深圳市华星光电技术有限公司 | Display device system circuit and display device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1617195A (en) * | 2003-10-30 | 2005-05-18 | 罗姆股份有限公司 | Light emitting element drive unit, display module having light emitting element drive unit and electronic apparatus |
| US20050128168A1 (en) * | 2003-12-08 | 2005-06-16 | D'angelo Kevin P. | Topology for increasing LED driver efficiency |
| WO2007074866A1 (en) * | 2005-12-28 | 2007-07-05 | Sharp Kabushiki Kaisha | Light emitting device driving circuit |
| US20080001547A1 (en) * | 2005-09-20 | 2008-01-03 | Negru Sorin L | Driving parallel strings of series connected LEDs |
| CN102074214A (en) * | 2010-12-23 | 2011-05-25 | 上海大学 | Monolithic integrated LED (light emitting diode) backlight and LCD (liquid crystal display) power supply driving system |
-
2012
- 2012-01-06 CN CN201210007354XA patent/CN103200730A/en active Pending
- 2012-09-19 TW TW101134355A patent/TW201330698A/en unknown
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1617195A (en) * | 2003-10-30 | 2005-05-18 | 罗姆股份有限公司 | Light emitting element drive unit, display module having light emitting element drive unit and electronic apparatus |
| US20050128168A1 (en) * | 2003-12-08 | 2005-06-16 | D'angelo Kevin P. | Topology for increasing LED driver efficiency |
| US20080001547A1 (en) * | 2005-09-20 | 2008-01-03 | Negru Sorin L | Driving parallel strings of series connected LEDs |
| WO2007074866A1 (en) * | 2005-12-28 | 2007-07-05 | Sharp Kabushiki Kaisha | Light emitting device driving circuit |
| CN102074214A (en) * | 2010-12-23 | 2011-05-25 | 上海大学 | Monolithic integrated LED (light emitting diode) backlight and LCD (liquid crystal display) power supply driving system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020215491A1 (en) * | 2019-04-23 | 2020-10-29 | 深圳市华星光电技术有限公司 | Display device system circuit and display device |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201330698A (en) | 2013-07-16 |
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Application publication date: 20130710 |