CN102006051B - Passive current balance actuating device - Google Patents

Passive current balance actuating device Download PDF

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CN102006051B
CN102006051B CN200910168158.9A CN200910168158A CN102006051B CN 102006051 B CN102006051 B CN 102006051B CN 200910168158 A CN200910168158 A CN 200910168158A CN 102006051 B CN102006051 B CN 102006051B
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diode
couples
light emitting
balancing capacitance
anode
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CN102006051A (en
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林哲民
叶怡君
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All Han Enterprise Co ltd
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All Han Enterprise Co ltd
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Abstract

The invention discloses a passive current balance actuating device, comprising a first actuator and a second actuator. The first actuator comprises a first balancing capacitance and a first rectifying unit, wherein the first end of the first balancing capacitance is coupled with the first end of an alternating current (AC) signal source, and the second end of the first balancing capacitance provides a first balancing alternating voltage; and the first rectifying unit is used for rectifying the first balancing alternating voltage so as to output a first direct current voltage to actuate a plurality of first light-emitting diodes (LEDs) connected in serials. The second actuator comprises a second balancing capacitance and a second rectifying unit, wherein the first end of the second balancing capacitance is coupled with the first end of the AC signal source, and the second end of the second balancing capacitance provides a second balancing alternating voltage; and the second rectifying unit is used for rectifying the second balancing alternating voltage so as to output the second direct current voltage to actuate a plurality of second LEDs connected in serials. The two balancing capacitances have equal capacitive reactance and the capacitive reactance is greater than total equivalent internal resistance of the first and second LEDs respectively.

Description

Passive type current balance actuating device
Technical field
The present invention relates to a kind of current balance type technology, particularly a kind of passive type current balance actuating device.
Background technology
In recent years, along with semiconductor technologies is flourish, portable electronic product and flat-panel screens product also rise thereupon.And in the middle of the type of numerous flat-panel screens, liquid crystal display (LiquidCrystal Display; Hereinafter referred to as: LCD) based on the advantage such as its low voltage operating, radiationless line scattering, lightweight and volume be little, become the main flow of each display product immediately.Generally speaking, because display panels itself does not have self luminous characteristic, therefore must place backlight module in the below of display panels, the light source provided needed for display panels is provided.
Traditional backlight module roughly can be divided into two classes, and the first is by cold-cathode tube (ColdCathode Fluorescent Lamps; Hereinafter referred to as: backlight module CCFL) formed, another is then by light emitting diode (light emitting diode; Hereinafter referred to as: backlight module LED) formed.Wherein, because LED backlight module can promote the colour gamut (color gamut) of liquid crystal display, so each panel dealer replaces cold-cathode tube backlight module mainly with LED backlight module greatly now.
LED backlight module has multi-series and parallel and is listed in light emitting diode together, and every a string light emitting diode is made up of multiple light emitting diode be serially connected.In fact, mostly adopt direct current transducer (DC-DC converter) direct supply to be converted to one group and can drive DC voltage needed for every a string light emitting diode simultaneously.But because the characteristic of each light emitting diode is not quite similar (internal resistance of such as light emitting diode), to such an extent as to the total internal resistance of equivalence of every a string light emitting diode will be different.So can know by inference, the electric current flowing through every a string light emitting diode can not identical (that is current imbalance), thus cause LED backlight module be supplied to the light-source brightness of display panels will be uneven.
In order to such problem will be solved, can regulate by adding a current balance type operation circuit in LED backlight module the electric current flowing through every a string light emitting diode, using causing the electric current flowing through every a string light emitting diode can identical (that is current balance type).And common current balance type operation circuit can be by multiple active member (such as metal-oxide layer-semiconductor-field-effect transistor (Metal-Oxide-Semiconductor Field-Effect Transistor; Hereinafter referred to as: MOSFET)) current mirror (current mirror) circuit that forms or current feedback compensation (current feedback compensation) circuit formed.In addition, current balance type operation circuit also can be made up of ready-made Current adjustment wafer (such as current sink IC).
But, because this type of semiconductor element of MOSFET often can cause its drain current (Id) different from the family curve (Id/Vgs) of lock source voltage (Vgs) because of processing procedure difference.Therefore, the current mirroring circuit utilizing MOSFET to form or current feedback compensation circuit regulate the degree of accuracy of the electric current flowing through every a string light emitting diode to be limited.
In addition, (be often 4 or 6 and regulate port numbers) that the adjustment port number of ready-made Current adjustment wafer is normally fixing, and because an adjustment passage is in order to regulate the electric current flowing through a string light emitting diode, so when LED backlight module has such as 10 string light emitting diode, then must select 3 Current adjustment wafers with 4 adjustment port numbers, or select 2 Current adjustment wafers with 6 adjustment port numbers, but select and anyly all can slattern 2 non-adjustment passages, this can cause unnecessary cost waste undoubtedly.
Summary of the invention
In view of this, the invention provides a kind of passive type current balance actuating device, it comprises first and second driver.Wherein, the first driver comprises the first balancing capacitance and the first rectification unit.The first end of the first balancing capacitance couples the first end of alternating message source, and the second end of the first balancing capacitance then provides the first symmetrical alternating current voltage.First rectification unit couples the second end of the first balancing capacitance, in order to receive and rectification first symmetrical alternating current voltage, uses output first DC voltage to drive multiple the first light emitting diode be serially connected.
In addition, the second driver comprises the second balancing capacitance and the second rectification unit.The first end of the second balancing capacitance couples the first end of alternating message source, and the second end of the second balancing capacitance then provides the second symmetrical alternating current voltage.Second rectification unit couples the second end of the second balancing capacitance, in order to receive and rectification second symmetrical alternating current voltage, uses output second DC voltage to drive multiple the second light emitting diode be serially connected.
In one embodiment of this invention, the capacitive reactance of the first balancing capacitance is greater than the total internal resistance of equivalence of all first light emitting diodes, and the capacitive reactance of the second balancing capacitance is greater than the total internal resistance of equivalence of all second light emitting diodes, and the capacitive reactance of first and second balancing capacitance is equal.
Based on above-mentioned known, the total internal resistance of equivalence of the light emitting diode that the ratio that the capacitive reactance of balancing capacitance designs mainly is serially connected by the present invention is also large, to such an extent as to the electric current flowing through the light emitting diode be serially connected mainly can depend on the capacitive reactance of balancing capacitance and the magnitude of voltage of alternating message source.Thus, if by the capacitive reactance of the balancing capacitance of All Drives in passive type current balance actuating device design identical, then the electric current flowing through the light emitting diode that each is serially connected will be close, thus reach the object of current balance type.
It is to be understood that above-mentioned general description and following embodiment are only exemplary and illustrative, its can not limit the present invention for advocate scope.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the passive type current balance actuating device of one embodiment of the invention.
Fig. 2 is the circuit diagram of the passive type current balance actuating device of another embodiment of the present invention.
Fig. 3 is the circuit diagram of the passive type current balance actuating device of yet another embodiment of the invention.
Main element symbol description:
CB1, CB1 ', CB2, CB2 ': balancing capacitance RU1, RU1 ', RU2, RU2 ': rectification unit
FU1, FU2: filter unit CF1, CF2: filter capacitor
L 11~ L 1n: the first light emitting diode L 21~ ~ L 2n: the second light emitting diode
ACS: alternating message source DCV1: the first DC voltage
DCV2: the second DC voltage 101,103,201,203,301,303:
Driver
100,200,300: passive type current balance actuating device
D 11, D 12, D 11', D 12', D 21, D 22, D 21', D 22': diode
BACV1, BACV1 ', BACV2, BACV2 ': symmetrical alternating current voltage
Embodiment
With detailed reference to embodiments of the invention, and the example of described embodiment is described in the accompanying drawings.In addition, all may part, in graphic and embodiment, use the element/component of identical label to represent identical or similar portions.
Fig. 1 is the circuit diagram of the passive type current balance actuating device 100 of one embodiment of the invention.Please refer to Fig. 1, passive type current balance actuating device 100 comprises driver 101 and 103.Wherein, driver 101 comprises balancing capacitance CB1, rectification unit RU1 and filter unit FU1; And driver 103 comprises balancing capacitance CB2, rectification unit RU2 and filter unit FU2.
In the present embodiment, the first end of balancing capacitance CB1 couples the first end of alternating message source ACS, and second end of balancing capacitance CB1 then provides symmetrical alternating current voltage BACV1.Wherein, alternating message source ACS is formed from the secondary side of the isolating transformer (isolation transformer) direct current transducer (DC-DC converter), but is not restricted to this.In addition, rectification unit RU1 couples second end of balancing capacitance CB1, in order to receive and rectification symmetrical alternating current voltage BACV1, uses output first DC voltage DCV1 to drive multiple the first light emitting diode L be serially connected 11~ L 1n.Moreover filter unit FU1 couples rectification unit RU1, carry out filtering in order to the first DC voltage DCV1 exported rectification unit RU1.If under the state that the rectification effect of rectification unit RU1 is good, then filter unit FU1 can be omitted.
It can thus be appreciated that, driver 101 and multiple the first light emitting diode L be serially connected 11~ L 1nform a complete current return, and receive the alternating voltage that alternating message source ACS provides, to be balanced alternating voltage BACV1 via balancing capacitance CB1.
In this, rectification unit RU1 comprises diode D 11with D 12.Diode D 11anode couple second end of balancing capacitance CB1, and diode D 11negative electrode then couple the first light emitting diode L 11~ L 1nin the 1st the first light emitting diode L 11anode.Diode D 12anode couple the first light emitting diode L 11~ L 1nin last first light emitting diode L 1nnegative electrode, and diode D 12negative electrode couple diode D 11anode.In addition, filter unit FU1 comprises filter capacitor CF1.The first end of filter capacitor CF1 couples diode D 11negative electrode, second end of filter capacitor CF1 then couples diode D 12anode and second end of alternating message source ACS.
On the other hand, the first end of balancing capacitance CB2 couples the first end of alternating message source ACS, and second end of balancing capacitance CB2 then provides symmetrical alternating current voltage BACV2.In addition, rectification unit RU2 couples second end of balancing capacitance CB2, in order to receive and rectification symmetrical alternating current voltage BACV2, uses output second DC voltage DCV2 to drive multiple the second light emitting diode L be serially connected 21~ L 2n.Moreover filter unit FU2 couples rectification unit RU2, carry out filtering in order to the second DC voltage DCV2 exported rectification unit RU2.If under the state that the rectification effect of rectification unit RU2 is good, then filter unit FU2 can be omitted.
In this, rectification unit RU2 comprises diode D 21with D 22.Diode D 21anode couple second end of balancing capacitance CB2, and diode D 21negative electrode then couple the second light emitting diode L 21~ L 2nin the 1st the second light emitting diode L 21anode.Diode D 22anode couple the second light emitting diode L 21~ L 2nin last second light emitting diode L 2nnegative electrode, and diode D 22negative electrode couple diode D 21anode.In addition, filter unit FU2 comprises filter capacitor CF2.The first end of filter capacitor CF2 couples diode D 21negative electrode, second end of filter capacitor CF2 then couples diode D 22anode and second end of alternating message source ACS.
It can thus be appreciated that, driver 103 and multiple the second light emitting diode L be serially connected 21~ L 2nform a complete current return, and receive the alternating voltage that alternating message source ACS provides, to be balanced alternating voltage BACV2 via balancing capacitance CB2.
In the present embodiment, due to each the first light emitting diode L 11~ L 1nwith the second light emitting diode L 21~ L 2ncharacteristic to be not quite similar (such as each first light emitting diode L 11~ L 1nwith the second light emitting diode L 21~ L 2ninternal resistance be not quite similar), to such an extent as to this two string the first light emitting diode L 11~ L 1nwith the second light emitting diode L 21~ L 2nthe total internal resistance of equivalence will be different.
Thus, if use identical DC voltage to drive this two string the first light emitting diode L 11~ L 1nwith the second light emitting diode L 21~ L 2n, due to this two string the first light emitting diode L 11~ L 1nwith the second light emitting diode L 21~ L 2nthe total internal resistance of equivalence different, to such an extent as to flow through this two string the first light emitting diode L 11~ L 1nwith the second light emitting diode L 21~ L 2nelectric current will different (that is current imbalance), thus cause this two string the first light emitting diode L 11~ L 1nwith the second light emitting diode L 21~ L 2nbrightness different.
In view of this, it is identical that the capacitive reactance (1/ ω C) of balancing capacitance CB1 and CB2 designs by the present embodiment spy, and the ratio first light emitting diode L that the capacitive reactance of balancing capacitance CB1 is designed 11~ L 1nthe total internal resistance of equivalence also want large, and the ratio second light emitting diode L capacitive reactance of balancing capacitance CB2 designed 21~ L 2nthe total internal resistance of equivalence also want large.Thus, allow and flow through the first light emitting diode L 11~ L 1nelectric current depend in fact capacitive reactance (but not the first light emitting diode L of the first end of alternating message source ACS and the voltage difference of the second end and balancing capacitance CB1 11~ L 1nthe total internal resistance of equivalence), and allow and flow through the second light emitting diode L 21~ L 2nelectric current depend in fact capacitive reactance (but not the second light emitting diode L of the first end of alternating message source ACS and the voltage difference of the second end and balancing capacitance CB2 21~ L 2nthe total internal resistance of equivalence).Also also because of so, can guarantee to flow through this two string the first light emitting diode L 11~ L 1nwith the second light emitting diode L 21~ L 2nelectric current can close (that is current balance type), thus make this two string the first light emitting diode L 11~ L 1nwith the second light emitting diode L 21~ L 2nbrightness identical.
It is worth mentioning that at this, second end of the alternating message source ACS shown in Fig. 1 also can couple the first light emitting diode L 11~ L 1nwith the second light emitting diode L 21~ L 2nin the 1st the first light emitting diode L 11with the second light emitting diode L 21anode, so also can reach similar technology effect.
In addition, Fig. 2 is the circuit diagram of the passive type current balance actuating device 200 of another embodiment of the present invention.Please merge with reference to Fig. 1 and Fig. 2, passive type current balance actuating device 200 comprises driver 201 and 203.With a upper embodiment unlike, driver 201 than driver more than 101 balancing capacitance CB1 ' and rectification unit RU1 '; And driver 203 than driver more than 103 balancing capacitance CB2 ' and rectification unit RU2 '; In addition, second end of filter capacitor CF1 and CF2 does not need the second end being coupled to alternating message source ACS.
In the present embodiment, the capacitive reactance of balancing capacitance CB1 ' is still the ratio first light emitting diode L of design 11~ L 1nthe total internal resistance of equivalence also want large, but equal with the capacitive reactance of balancing capacitance CB1.Similarly, the capacitive reactance of balancing capacitance CB2 ' is still the ratio second light emitting diode L of design 21~ L 2nthe total internal resistance of equivalence also want large, but equal with the capacitive reactance of balancing capacitance CB2.Clearer, balancing capacitance CB1, CB1 ', CB2 and CB2 ' capacitive reactance be equal.
In the present embodiment, the first end of balancing capacitance CB1 and CB2 is still the first end coupling alternating message source ACS, and second end of balancing capacitance CB1 and CB2 then distinctly provides symmetrical alternating current voltage BACV1 and BACV2.In addition, the first end of balancing capacitance CB1 ' and CB2 ' couples second end of alternating message source ACS, and second end of balancing capacitance CB1 ' and CB2 ' then distinctly provides symmetrical alternating current voltage BACV1 ' and BACV2 '.
In this, rectification unit RU1 ' couples second end of balancing capacitance CB1 ', in order to receive and rectification symmetrical alternating current voltage BACV1 ', uses output first DC voltage DCV1 and drives the first light emitting diode L be serially connected 11~ L 1n.Wherein, rectification unit RU1 ' comprises diode D 11' and D 12'.Diode D 11' anode couple second end of balancing capacitance CB1 ', and diode D 11' negative electrode then couple diode D 11negative electrode.Diode D 12' anode couple diode D 12anode, and diode D 12' negative electrode couple diode D 11' anode.
Similarly, rectification unit RU2 ' couples balancing capacitance CB2 ', in order to receive and rectification symmetrical alternating current voltage BACV2 ', uses output second DC voltage DCV2 and drives the second light emitting diode L be serially connected 21~ L 2n.Wherein, rectification unit RU2 ' comprises diode D 21' and D 22'.Diode D 21' anode couple second end of balancing capacitance CB2 ', and diode D 21' negative electrode then couple diode D 21negative electrode.Diode D 22' anode couple diode D 22anode, and diode D 22' negative electrode couple diode D 21' anode.
Based on above-mentioned, the present embodiment is equally by balancing capacitance CB1, CB1 ', CB2 and CB2 ' capacitive reactance design identical, and by the capacitive reactance of balancing capacitance CB1 and CB1 ' design ratio first light emitting diode L 11~ L 1nthe total internal resistance of equivalence also want large, and by ratio second light emitting diode L that the capacitive reactance of balancing capacitance CB2 and CB2 ' designs 21~ L 2nthe total internal resistance of equivalence also want large.Thus, allow and flow through the first light emitting diode L 11~ L 1nelectric current depend in fact the capacitive reactance of the first end of alternating message source ACS and the voltage difference of the second end and balancing capacitance CB1 and CB1 ', and allow and flow through the second light emitting diode L 21~ L 2nelectric current depend in fact the capacitive reactance of the first end of alternating message source ACS and the voltage difference of the second end and balancing capacitance CB2 and CB2 '.Also also because of so, can guarantee to flow through this two string the first light emitting diode L 11~ L 1nwith the second light emitting diode L 21~ L 2nelectric current can close (that is current balance type), thus make this two string the first light emitting diode L 11~ L 1nwith the second light emitting diode L 21~ L 2nbrightness identical.
Moreover Fig. 3 is the circuit diagram of the passive type current balance actuating device 300 of yet another embodiment of the invention.Please merge with reference to Fig. 2 and Fig. 3, passive type current balance actuating device 300 comprises driver 301 and 303.With a upper embodiment unlike, driver 301 is fewer than driver 201 balancing capacitance CB1 '; And driver 303 balancing capacitance CB2 ' fewer than driver 203, but passive type current balance actuating device 200 is similar to the operation workflow of 300 reality, therefore no longer to be repeated at this.
With regard to application, as long as by the modularity increase the words of its quantity in addition of each driver in passive type current balance actuating device 100,200 and 300, passive type current balance actuating device 100,200 and 300 just can be used to the every a string light emitting diode in the LED backlight module of driving liquid crystal displays, use and cause the electric current flowing through every a string light emitting diode identical (that is current balance type), thus make LED backlight module to be supplied to the light-source brightness of display panels more even.
But passive type current balance actuating device 100,200 and 300 is not restricted to only can every a string light emitting diode in the LED backlight module of driving liquid crystal displays.In other words, as long as under driving the condition of many string light emitting diodes at the same time (such as: large-scale LED advertising billboard), passive type current balance actuating device 100,200 and 300 just can be used to the use of balanced balanced current.
In addition, because each driver in passive type current balance actuating device 100,200 and 300 only need be made up of several passive device.Therefore, the cost of the cost of manufacture of the required cost current balance type operation circuit that multiple active member (MOSFET) or Current adjustment wafer (currentsink IC) will be utilized to form far below traditional technology.
In sum, the total internal resistance of equivalence of the light emitting diode that the ratio that the capacitive reactance of balancing capacitance designs mainly is serially connected by the present invention is also large, to such an extent as to the electric current flowing through the light emitting diode be serially connected mainly can depend on the capacitive reactance of balancing capacitance and the magnitude of voltage of alternating voltage.Thus, if by the capacitive reactance of the balancing capacitance of All Drives in passive type current balance actuating device design identical, then the electric current flowing through the light emitting diode that each is serially connected will be equal, thus reach the object of current balance type.
It is last it is noted that above embodiment is only in order to illustrate technical scheme of the present invention but not to be limited, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to technical scheme of the present invention or equivalent replacement, and these are revised or be equal to the spirit and scope that replacement also can not make amended technical scheme disengaging technical solution of the present invention.

Claims (16)

1. a passive type current balance actuating device, comprising:
One first driver, comprising:
One first balancing capacitance, the first end of described first balancing capacitance couples the first end of an alternating message source, and the second end of described first balancing capacitance then provides one first symmetrical alternating current voltage; And
One first rectification unit, couples the second end of described first balancing capacitance, in order to receive and the first symmetrical alternating current voltage described in rectification, uses output one first DC voltage to drive a string multiple first light emitting diodes be mutually serially connected; And
One second driver, comprising:
One second balancing capacitance, the first end of described second balancing capacitance couples the first end of described alternating message source, and the second end of described second balancing capacitance then provides one second symmetrical alternating current voltage; And
One second rectification unit, couples the second end of described second balancing capacitance, in order to receive and the second symmetrical alternating current voltage described in rectification, uses output one second DC voltage to drive a string multiple second light emitting diodes be mutually serially connected,
Wherein, the capacitive reactance of described first balancing capacitance is greater than the total internal resistance of equivalence of described a string multiple first light emitting diodes be mutually serially connected, and the capacitive reactance of described second balancing capacitance is greater than the total internal resistance of equivalence of described a string multiple second light emitting diodes be mutually serially connected, and described first balancing capacitance is equal with the capacitive reactance of described second balancing capacitance
Wherein, the electric current flowing through described a string multiple first light emitting diodes be mutually serially connected depends on the capacitive reactance of the first end of described alternating message source and the voltage difference of the second end and described first balancing capacitance, and the electric current flowing through described a string multiple second light emitting diodes be mutually serially connected depends on the capacitive reactance of the first end of described alternating message source and the voltage difference of the second end and described second balancing capacitance
Wherein, under the condition that described first balancing capacitance is equal with the capacitive reactance of described second balancing capacitance, the electric current flowing through described a string multiple first light emitting diodes be mutually serially connected can equal the electric current flowing through described a string multiple second light emitting diodes be mutually serially connected, thus make described a string multiple first light emitting diode be mutually serially connected identical with the brightness of described a string multiple second light emitting diodes be mutually serially connected
Wherein, described alternating message source is that the secondary side of one isolating transformer from a direct current transducer is formed.
2. passive type current balance actuating device according to claim 1, wherein said first rectification unit comprises:
One first diode, the anode of described first diode couples the second end of described first balancing capacitance, and the negative electrode of described first diode then couples the anode of the 1st the first light emitting diode in described a string multiple first light emitting diodes be mutually serially connected; And
One second diode, the anode of described second diode couples the negative electrode of last the first light emitting diode in described a string multiple first light emitting diodes be mutually serially connected, and the negative electrode of described second diode couples the anode of described first diode.
3. passive type current balance actuating device according to claim 2, wherein said first driver also comprises:
One filter unit, couples described first rectification unit, carries out filtering in order to described first DC voltage exported described first rectification unit.
4. passive type current balance actuating device according to claim 3, wherein said filter unit comprises:
One filter capacitor, the first end of described filter capacitor couples the negative electrode of described first diode, and the second end of described filter capacitor then couples the anode of described second diode.
5. passive type current balance actuating device according to claim 4, the first end of wherein said filter capacitor or the second end are also coupled to the second end of described alternating message source.
6. passive type current balance actuating device according to claim 4, wherein said first driver also comprises:
One the 3rd balancing capacitance, the first end of described 3rd balancing capacitance couples the second end of described alternating message source, and the second end of described 3rd balancing capacitance then provides one the 3rd symmetrical alternating current voltage; And
One the 3rd rectification unit, couples the second end of described 3rd balancing capacitance, in order to receive and the 3rd symmetrical alternating current voltage described in rectification, uses and exports described first DC voltage to drive described a string multiple first light emitting diodes be mutually serially connected,
Wherein, the capacitive reactance of described 3rd balancing capacitance is greater than the total internal resistance of equivalence of described a string multiple first light emitting diodes be mutually serially connected, and described first balancing capacitance is equal with the capacitive reactance of described 3rd balancing capacitance.
7. passive type current balance actuating device according to claim 6, wherein said 3rd rectification unit comprises:
One the 3rd diode, the anode of described 3rd diode couples the second end of described 3rd balancing capacitance, and the negative electrode of described 3rd diode then couples the negative electrode of described first diode; And
One the 4th diode, the anode of described 4th diode couples the anode of described second diode, and the negative electrode of described 4th diode couples the anode of described 3rd diode.
8. passive type current balance actuating device according to claim 4, wherein said first driver also comprises:
One the 3rd rectification unit, comprising:
One the 3rd diode, the anode of described 3rd diode couples the second end of described alternating message source, and the negative electrode of described 3rd diode then couples the negative electrode of described first diode; And
One the 4th diode, the anode of described 4th diode couples the anode of described second diode, and the negative electrode of described 4th diode couples the anode of described 3rd diode.
9. passive type current balance actuating device according to claim 1, wherein said second rectification unit comprises:
One first diode, the anode of described first diode couples the second end of described second balancing capacitance, and the negative electrode of described first diode then couples the anode of the 1st the second light emitting diode in described a string multiple second light emitting diodes be mutually serially connected; And
One second diode, the anode of described second diode couples the negative electrode of last the second light emitting diode in described a string multiple second light emitting diodes be mutually serially connected, and the negative electrode of described second diode couples the anode of described first diode.
10. passive type current balance actuating device according to claim 9, wherein said second driver also comprises:
One filter unit, couples described second rectification unit, carries out filtering in order to described second DC voltage exported described second rectification unit.
11. passive type current balance actuating devices according to claim 10, wherein said filter unit comprises:
One filter capacitor, the first end of described filter capacitor couples the negative electrode of described first diode, and the second end of described filter capacitor then couples the anode of described second diode.
12. passive type current balance actuating devices according to claim 11, the first end of wherein said filter capacitor or the second end are also coupled to the second end of described alternating message source.
13. passive type current balance actuating devices according to claim 11, wherein said second driver also comprises:
One the 3rd balancing capacitance, the first end of described 3rd balancing capacitance couples the second end of described alternating message source, and the second end of described 3rd balancing capacitance then provides one the 3rd symmetrical alternating current voltage; And
One the 3rd rectification unit, couples the second end of described 3rd balancing capacitance, in order to receive and the 3rd symmetrical alternating current voltage described in rectification, uses and exports described second DC voltage to drive described a string multiple second light emitting diodes be mutually serially connected,
Wherein, the capacitive reactance of described 3rd balancing capacitance is greater than the total internal resistance of equivalence of described a string multiple second light emitting diodes be mutually serially connected, and described second is equal with the capacitive reactance of described 3rd balancing capacitance.
14. passive type current balance actuating devices according to claim 13, wherein said 3rd rectification unit comprises:
One the 3rd diode, the anode of described 3rd diode couples the second end of described 3rd balancing capacitance, and the negative electrode of described 3rd diode then couples the negative electrode of described first diode; And
One the 4th diode, the anode of described 4th diode couples the anode of described second diode, and the negative electrode of described 4th diode couples the anode of described 3rd diode.
15. passive type current balance actuating devices according to claim 11, wherein said second driver also comprises:
One the 3rd rectification unit, comprising:
One the 3rd diode, the anode of described 3rd diode couples the second end of described alternating message source, and the negative electrode of described 3rd diode then couples the negative electrode of described first diode; And
One the 4th diode, the anode of described 4th diode couples the anode of described second diode, and the negative electrode of described 4th diode couples the anode of described 3rd diode.
16. passive type current balance actuating devices according to claim 1, wherein said passive type current balance actuating device is at least suitable for a LED backlight module of driving one liquid crystal display.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2829281Y (en) * 2005-11-01 2006-10-18 周志邦 LED lighting drive circuit
CN201119051Y (en) * 2007-08-23 2008-09-17 梁雯洁 A capacitor voltage reduction LED lighting circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2829281Y (en) * 2005-11-01 2006-10-18 周志邦 LED lighting drive circuit
CN201119051Y (en) * 2007-08-23 2008-09-17 梁雯洁 A capacitor voltage reduction LED lighting circuit

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