CN102446492A - Short-circuit sensing circuit and method, and driving chip and equipment of light emitting diode - Google Patents
Short-circuit sensing circuit and method, and driving chip and equipment of light emitting diode Download PDFInfo
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- CN102446492A CN102446492A CN2010105094609A CN201010509460A CN102446492A CN 102446492 A CN102446492 A CN 102446492A CN 2010105094609 A CN2010105094609 A CN 2010105094609A CN 201010509460 A CN201010509460 A CN 201010509460A CN 102446492 A CN102446492 A CN 102446492A
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Abstract
The invention discloses a short-circuit sensing circuit which comprises a voltage dividing circuit, a voltage suppressing circuit, and a comparator; the voltage dividing circuit is used for generating a divided voltage according to a bottom voltage of one or more serially connected light emitting diodes, and the divided voltage is smaller than the bottom voltage; the voltage suppressing circuit is coupled with the voltage dividing circuit and used for suppressing the divided voltage; the comparator is coupled with the voltage dividing circuit and used for comparing the divided voltage with a reference voltage and determining whether the one or more serially connected light emitting diodes are in short circuits according to the compared result.
Description
Technical field
The present invention relates in short circuit detecting, especially relates to a kind of short circuit circuit for detecting that high pressure burns when avoiding the short circuit detecting, light-emitting diodes pipe driving chip and the light-emitting diode assembly of using this short circuit circuit for detecting, and a kind of short circuit method for detecting.
Background technology
In recent years because environmental consciousness improves with technology day by day ripe; Light emitting diode (light-emittingdiode; LED) (cold cathode fluorescent lamp CCFL) becomes the main flow of computing machine and TV screen backlight to replace cathode fluorescent tube gradually.In known light-emitting diode assembly; For fear of light-emitting diodes tube short circuit (LED short) cause light-emitting diodes pipe driving chip inside than power consumption and even cause light-emitting diodes pipe driving chip damage; Light-emitting diodes pipe driving chip inside also can be provided with a short circuit circuit for detecting usually and be used for detecting short circuit, closes drive current with the inner LED driving circuit of control light emitting diode chip for driving when short circuit takes place.
Please refer to Fig. 1, Fig. 1 is the synoptic diagram of a known light-emitting diode assembly 10.Light-emitting diode assembly 10 comprises a light emitting diode serial C1 and a light-emitting diodes pipe driving chip 102 among the figure; And light-emitting diodes pipe driving chip 102 includes a LED driving circuit 104 and a comparer 106 (being the short circuit circuit for detecting), is used for respectively light emitting diode serial C1 is driven and the short circuit detecting.Must notice that this figure is for concisely only illustrating single light emitting diode serial, single comparer and single driving circuit.In fact, light-emitting diode assembly 10 can comprise the light emitting diode serial of a plurality of parallel connections, a plurality of comparers and a plurality of driving circuit.Each light emitting diode serial is all similar with light emitting diode serial C1, is by corresponding driving circuit in the light-emitting diodes pipe driving chip 102 and corresponding comparer drives and short circuit detecting.
Careful; LED driving circuit 104 can be according to a feedback voltage Vfb who is relevant to light emitting diode serial C1; Provide drive current with driven for emitting lights diode serial C1, (about 20V～40V) is locked in a rational voltage range to make a feedback voltage Vfb and a booster voltage Vbst.Comparer 106 can (for example about 5～8V) compare a bottom voltage Vbtm and chip internal one reference voltage Vref of light emitting diode serial C1; And as bottom voltage Vbtm during greater than reference voltage Vref; Judge that light emitting diode serial C1 is short-circuited, and then control LED driving circuit 104 is closed corresponding drive current.
Under above-mentioned configuration, in case in the middle of the light emitting diode serial C1 arbitrary or a plurality of light emitting diode to be short-circuited and to cause cross-pressure be zero, its bottom voltage Vbtm can rise and greater than reference voltage Vref.In this simultaneously, it is excessive and judge that light emitting diode serial Cl is short-circuited that comparer 106 can detect bottom voltage Vbtm, and then control LED driving circuit 104 is closed the drive current of light emitting diode serial C1.
Close the drive current of light emitting diode serial C1 in LED driving circuit 104 after, it is accurate that bottom voltage Vbtm more will rise to the high pressure position identical with booster voltage Vbst.Because known light-emitting diodes pipe driving chip 102 is to be made with high pressure manufacturing process, therefore can receives this high pressure position standard and but not damage.Yet (system on chip, under trend SOC), the light-emitting diodes pipe driving chip is integrated with image-processing circuit, and makes to reach higher operating speed with low pressure processing procedure (operating voltage is not higher than 5V usually) at present system combination chip.Therefore, consider that the low pressure single-chip burns easily when receiving high pressure, known short circuit circuit for detecting is real to have improved necessity, can be applicable to the technology trends of low pressure single-chip.
Summary of the invention
Therefore; One of fundamental purpose of the present invention promptly is the light-emitting diodes pipe driving chip and the light-emitting diode assembly that a kind of short circuit circuit for detecting are provided, use this short circuit circuit for detecting; And a kind of short circuit method for detecting, it all can be applicable to the processing procedure of low pressure single-chip.
The present invention discloses a kind of short circuit circuit for detecting.This short circuit circuit for detecting includes a bleeder circuit, is used for a bottom voltage according to one or more light emitting diode serial, produces the branch pressure voltage less than this bottom voltage; One voltage throttle circuit is coupled to this bleeder circuit, is used for suppressing this branch pressure voltage; And a comparer, be coupled to this bleeder circuit, be used for relatively this branch pressure voltage and a reference voltage, whether be short-circuited to decide this one or more light emitting diode serial according to comparative result.
The present invention also discloses a kind of light-emitting diodes pipe driving chip.This light-emitting diodes pipe driving chip includes a voltage throttle circuit; Be used for suppressing the branch pressure voltage that a bleeder circuit is produced; Wherein this bleeder circuit is used for the bottom voltage according to one or more light emitting diode serial, produces this branch pressure voltage less than this bottom voltage; One drive circuit is used for producing a drive current to drive this one or more light emitting diode serial; And a comparer, be used for relatively this branch pressure voltage and a reference voltage, whether be short-circuited to decide this one or more light emitting diode serial according to comparative result, and when short circuit takes place, indicate this driving circuit to close this drive current.
The present invention also discloses a kind of short circuit method for detecting, includes the bottom voltage according to one or more light emitting diode serial, produces the branch pressure voltage less than this bottom voltage; Suppress this branch pressure voltage less than a withstand voltage; And relatively this branch pressure voltage and a reference voltage, whether be short-circuited to decide this one or more light emitting diode serial according to comparative result.
Cooperate detailed description and claims of following diagram, embodiment at this, will on address other purpose of the present invention and advantage and be specified in after.
Description of drawings
Fig. 1 is the synoptic diagram of a known light-emitting diode assembly.
Fig. 2 is the configuration diagram of the embodiment of the invention one light-emitting diode assembly.
Fig. 3 is a thin portion circuit diagram of light-emitting diode assembly among Fig. 2.
Fig. 4 is a circuit diagram of an alternate embodiment of light-emitting diode assembly among Fig. 2.
Fig. 5 is the synoptic diagram of the embodiment of the invention one short circuit detecting flow process.
Wherein, description of reference numerals is following:
10,20 light-emitting diode assemblies
102,202 light-emitting diodes pipe driving chips
104 LED driving circuits
106,212 comparers
206 short circuit circuit for detecting
208 bleeder circuits
210 voltage throttle circuit
302 unity gain buffers
304 compacting diodes
The special diode of 402 Xiao Ji
50 short circuits detecting flow process
500～508 steps
The serial of C1 light emitting diode
The Vfb feedback voltage
Vbtm bottom voltage
Vref, Vref ' reference voltage
The Vbst booster voltage
The Vd branch pressure voltage
Rext first resistance
Rd second resistance
Vcl suppresses voltage
The Vo output voltage
Embodiment
Please refer to Fig. 2, Fig. 2 is the configuration diagram of the embodiment of the invention one light-emitting diode assembly 20.The framework of light-emitting diode assembly 20 and running are partly similar with light-emitting diode assembly 10, so identical assembly and the signal of purposes represented with same-sign.Light-emitting diode assembly 20 has and various structure with main different being in central short circuit circuit for detecting 206 and short circuit circuit for detecting 106 of light-emitting diode assembly 10.Will explain that below short circuit circuit for detecting 206 can be used to carry out the short circuit detecting of light emitting diode, but can not cause light-emitting diodes pipe driving chip 202 to receive high pressure and damage.
In detail, short circuit circuit for detecting 206 includes a bleeder circuit 208, a voltage throttle circuit (voltage clamp circuit) 210 and one comparer 212.In other words, short circuit circuit for detecting 206 is that with the main difference of known short circuit circuit for detecting 106 short circuit circuit for detecting 206 is extra bleeder circuit 208 and voltage throttle circuit 210 of having set up.In addition, short circuit circuit for detecting 206 is can part (as shown in Figure 2) or all be integrated in the light-emitting diodes pipe driving chip 202 with LED driving circuit 102.
210 of voltage throttle circuit can be used to suppress branch pressure voltage Vd.Under preferable situation, voltage throttle circuit 210 is to make branch pressure voltage Vd be no more than light-emitting diodes pipe driving chip 202 can stand the maximum voltage that does not burn out, i.e. withstand voltage; Under the situation of Yu Gengjia, voltage throttle circuit 210 is to make branch pressure voltage Vd be no more than the low operating voltage Vlp of (promptly being less than or equal to) light-emitting diodes pipe driving chip 202 itself.Comparer 212 can be with a branch pressure voltage Vd and a reference voltage Vref ' compare; And in branch pressure voltage Vd greater than reference voltage Vref ' time; Judge that light emitting diode serial C1 is short-circuited, and then control LED driving circuit 104 is closed corresponding drive current.Similarly, reference voltage Vref can be designed to be no more than withstand voltage, and preferable situation is for being no more than low operating voltage Vlp.
In a specific embodiment, voltage throttle circuit 21 is according to accurate its pressing function that starts in the position of branch pressure voltage Vd.Particularly, the accurate pressing function that is not enough to trigger voltage throttle circuit 210 in the position of branch pressure voltage Vd does not take place or short circuit generation but drive current when not closing as yet when short circuit.Right close and cause voltage Vbtm too high arrival one certain bits in bottom certainly when (it is about a scope) when short circuit generation and drive current; Voltage throttle circuit 210 begins to suppress branch pressure voltage Vd so that it almost is maintained this certain bits standard, and this certain bits will definitely be designed to be no more than withstand voltage or low operating voltage Vlp.As a result, branch pressure voltage Vd can be when not being short-circuited and be short-circuited, neither withstand voltage or the low operating voltage Vlp of surpassing.
More than comprehensive, the high pressure that directly receives bottom voltage Vbtm when bleeder circuit 208 can be avoided the short circuit detecting gets into light-emitting diodes pipe driving chip 202 inside.In addition, 210 of voltage throttle circuit can be closed and when causing bottom voltage Vbtm to rise compacting branch pressure voltage Vd in short circuit generation, drive current.Through the Collaboration of bleeder circuit 208 and voltage throttle circuit 210, can avoid light-emitting diodes pipe driving chip 202 directly to receive high pressure and damage.
In Fig. 2, both implementations of bleeder circuit 208 and voltage throttle circuit 210 are neither to be limited to certain architectures and operation.There is the circuit of all different structures all can realize bleeder circuit 208 and voltage throttle circuit 210.Below will utilize Fig. 3 and Fig. 4 to illustrate the bleeder circuit 208 of different embodiment and the thin portion structure and the operation of voltage throttle circuit 210.
Please refer to Fig. 3, Fig. 3 is a thin portion circuit diagram of light-emitting diode assembly 20 among Fig. 2.As shown in Figure 3, bleeder circuit 208 includes one first resistance R ext and the one second resistance R d that is coupled.Receive bottom voltage Vbtm through the first resistance R ext; Again through second resistance R d output less than the branch pressure voltage Vd (being Vbtm*Rd/ (Rext+Rd)) of bottom voltage Vbtm to the inner comparer 106 of light-emitting diodes pipe driving chip 202, comparer 106 can compare judging whether and be short-circuited.Thus, when short circuit was detected, what get into light-emitting diodes pipe driving chip 202 inside was that the branch pressure voltage Vd of low level gained falls in bottom voltage Vbtm through dividing potential drop, but not is the high levels of bottom voltage Vbtm at short circuit circuit for detecting 206.The resistance ratio of the first resistance R ext and the second resistance R d, the position that for example can be depending on the branch pressure voltage Vd that is wished to get is accurate.For example, the resistance of the first resistance R ext can be greater than the resistance of the second resistance R d, in order to do effectively to carry out step-down.In addition, it should be noted that under preferable situation that the first resistance R ext and the second resistance R d can be arranged at outside and inner (as shown in the figure) of light-emitting diodes pipe driving chip 202 respectively.In other embodiment, both all are positioned at the outside or inner of light-emitting diodes pipe driving chip 202 also can to design the first resistance R ext and the second resistance R d.
On the other hand, voltage throttle circuit 210 includes a unity gain buffer (unit gain buffer) 302 and one compacting diode 304.Unity gain buffer 302, it has first input end and is coupled to a compacting voltage Vcl, and has second input end and an output terminal couples each other mutually, and an output voltage V o who is used to keep its output terminal is in the position of this compacting voltage Vcl certainly.In addition, compacting diode 304 (being the PN junction rectifier for example), it is coupled between the output terminal and this branch pressure voltage Vd of unity gain buffer 302, and then being used for when conducting, keeping its cross-pressure is a forward voltage Vc (Vc for example is about 0.7V).Therefore; When short circuit generation, drive current are closed and to cause bottom voltage Vbtm to rise to the high pressure position of booster voltage Vbst accurate (behind about 20V～40V); Branch pressure voltage Vd can rise and let compacting diode 304 conductings and have the cross-pressure that is almost fixing forward voltage Vc; Unit of fit gain buffer 302 is kept the accurate position standard for compacting voltage Vcl of output voltage V o simultaneously; As a result branch pressure voltage Vd can be maintained at compacting voltage Vcl and forward voltage Vc's and the position certainly, i.e. Vd=Vo+Vc=Vcl+Vc.In other words, the certain bits with described in the explanation that promptly equals Fig. 2 of the compacting voltage Vcl of Fig. 3 and forward voltage Vc is accurate, and it can be designed to be less than or equal to the withstand voltage or the low operating voltage Vlp of light-emitting diodes pipe driving chip 202.As a result, cause bottom voltage Vbtm to rise too high even be short-circuited, the branch pressure voltage Vd that light-emitting diodes pipe driving chip 202 received still is no more than withstand voltage or low operating voltage Vlp and can burn.Must notice that in other embodiment, voltage throttle circuit 210 for example can be embodied as the PN junction rectifier of a plurality of polyphones, even other impedance component like resistance and so on of arranging in pairs or groups.
For instance, suppose that low operating voltage Vlp is 3.3V, can design the first resistance R ext resistance and be 1M nurse difficult to understand, the second resistance R d resistance is a 180k nurse difficult to understand, reference voltage Vref ' be 1.2V, suppress voltage Vcl and be 1.6V and booster voltage Vbst is 40V.Therefore; As the bottom of light emitting diode serial C1 voltage Vbtm during greater than 7.9V; Branch pressure voltage Vd is greater than reference voltage Vref ' 1.2V; Comparer 212 can judge that light emitting diode serial C1 is short-circuited, and controls LED driving circuit 104 and close the drive current of light emitting diode serial C1, and then causes bottom voltage Vbtm to continue to rise to the 40V of booster voltage Vbst.At this moment, through the running of voltage throttle circuit 210, can with branch pressure voltage Vd be compressed to compacting voltage Vcl and forward voltage Vc and, i.e. 2.3V (less than the 3.3V of low operating voltage Vlp).Compare, if no-voltage throttle circuit 210, then branch pressure voltage Vd can rise to 6.1V and much larger than the 3.3V of low operating voltage Vlp.Therefore, light-emitting diodes pipe driving chip 202 can be avoided damaging because of short circuit circuit for detecting 206 receives high pressure.
Please refer to Fig. 4, Fig. 4 is a circuit diagram of an alternate embodiment of light-emitting diode assembly 20 among Fig. 2.The difference of Fig. 4 and Fig. 3 mainly is the inner structure of voltage throttle circuit 210.As shown in Figure 4, voltage throttle circuit 210 can realize by special (Schottky) diode 402 of a Xiao Ji.When short circuit generation, drive current are closed and when causing suppressing branch pressure voltage Vd and rising too high, special diode 402 collapses (breakdown) of contrary inclined to one side Xiao Ji, and its cross-pressure can almost be maintained a fixing disruptive voltage Vbr.In other words, it is accurate that disruptive voltage Vbr promptly equals the described certain bits of Fig. 2, and it also is no more than the withstand voltage or the low operating voltage Vlp (such as 5V) of light emitting diode chip for driving 202.As a result, cause bottom voltage Vbtm to rise too high even be short-circuited, the branch pressure voltage Vd that light-emitting diodes pipe driving chip 202 received still is no more than withstand voltage or low operating voltage Vlp and can burn.Must notice that in other embodiment, voltage throttle circuit 210 for example can be embodied as the special diode of Xiao Ji of a plurality of polyphones, or single or a plurality of along inclined to one side PN junction rectifier, or even other impedance component like resistance and so on of arranging in pairs or groups.On the other hand, the bleeder circuit 208 of this figure is identical with person shown in Figure 3, and the circuit structure shown in so being not limited to is as long as can reach the branch compression functions.
It should be noted that in Fig. 2 bleeder circuit 208 and voltage throttle circuit 210 are to carry out the running of dividing potential drop and voltage compacting respectively, both implementations are not limited to ad hoc rules.Those of ordinary skills work as and can modify according to this or change, and are not limited to Fig. 3 and thin portion structure and operation shown in Figure 4.
In addition, also it is noted that similar with Fig. 1, Fig. 2 to Fig. 4 is for only illustrate single light emitting diode serial, single throttle circuit, single bleeder circuit, single comparer and single driving circuit respectively for simplicity.In fact, light-emitting diode assembly 10 can comprise one to multiple group light emitting diode serial, one or more throttle circuit, one or more bleeder circuit, one or more comparer, and one or more driving circuit.Each group light emitting diode serial all comprises one or more light emitting diode serial; And drive by corresponding driving circuit in the light-emitting diodes pipe driving chip 202, and carry out the short circuit detecting by corresponding bleeder circuit, throttle circuit and comparer.The framework of thin portion is same as described above with operation, repeats no more in this.
The short circuit detecting operation of short circuit circuit for detecting 206 can reduce short circuit detecting flow process 50, and shown in the embodiment of Fig. 5, it comprises following steps:
Step 500: beginning.
Step 502:, produce branch pressure voltage Vd less than bottom voltage Vbtm according to the bottom voltage Vbtm of light emitting diode serial C1.
Step 504: compacting branch pressure voltage Vd, so that it is no more than withstand voltage or low operating voltage Vlp.
Step 506: compare a branch pressure voltage Vd and a reference voltage Vref ', whether be short-circuited to decide light emitting diode serial C1 according to comparative result.
Step 508: finish.
Wherein the details of each step can be analogized and got by the operation of the corresponding assembly of short circuit circuit for detecting 206, does not give unnecessary details in addition at this.
The foregoing description does not directly receive high pressure and changes and adopt lower branch pressure voltage and do short circuit detecting, and more suppresses for branch pressure voltage, and the chip in the time of therefore can avoiding the short circuit detecting damages problem.In detail, at first produce less than the branch pressure voltage Vd of bottom voltage Vbtm and according to this branch pressure voltage Vd and carry out the short circuit detecting, therefore can avoid the high pressure of bottom voltage Vbtm directly to get into light-emitting diodes pipe driving chip 202 inside.In addition; More suppress withstand voltage or the low operating voltage Vlp less than chip in the inner branch pressure voltage Vd of light-emitting diodes pipe driving chip 202; Even if therefore short circuit generation, drive current is closed and cause bottom voltage Vbtm to rise too high, branch pressure voltage Vd still is maintained low pressure.Damage problem when as a result, the light-emitting diodes pipe driving chip can be avoided the short circuit detecting.
Comprehensively above-mentioned, under the requirement of the trend of present system combination chip and high operating speed, the light-emitting diodes pipe driving chip is integrated with the image processing interlock circuit and makes with the low pressure processing procedure.Yet the problem that high pressure entering chip internal causes the chip damage takes place because of direct reception bottom voltage Vbtm carries out the short circuit detecting in known technology.In comparison; The foregoing description does not directly receive high pressure and changes and adopt branch pressure voltage and do short circuit detecting; And more suppress for branch pressure voltage, cause chip to burn so can avoid high pressure to get into chip, thereby can cooperate the technology trends of low pressure processing procedure single-chip.
The above is merely the preferred embodiments of the present invention, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (18)
1. a short circuit circuit for detecting is characterized in that, includes:
One bleeder circuit is used for a bottom voltage according to one or more light emitting diode serial, produces the branch pressure voltage less than this bottom voltage;
One voltage throttle circuit is coupled to this bleeder circuit, is used for suppressing this branch pressure voltage; And
Whether one comparer is coupled to this bleeder circuit, is used for relatively this branch pressure voltage and a reference voltage, be short-circuited to decide this one or more light emitting diode serial according to comparative result.
2. short circuit circuit for detecting as claimed in claim 1 is characterized in that, this voltage throttle circuit is this branch pressure voltage of compacting so that it one of is no more than in the middle of a low operating voltage and the withstand voltage of a chip person.
3. short circuit circuit for detecting as claimed in claim 1 is characterized in that, is raised to when this bottom electrical presses that to reach a certain bits punctual, this voltage throttle circuit begin to suppress this branch pressure voltage so that its to be maintained this certain bits in fact accurate.
4. short circuit circuit for detecting as claimed in claim 1 is characterized in that, cuts off and after causing this bottom electrical voltage rise height, this voltage throttle circuit is suppressed this branch pressure voltage in a drive current that this one or more light emitting diode serial received.
5. short circuit circuit for detecting as claimed in claim 1 is characterized in that, this bleeder circuit includes:
One first resistance is coupled to this bottom voltage; And
One second resistance is coupled to this first resistance, in order to export this branch pressure voltage.
6. short circuit circuit for detecting as claimed in claim 1 is characterized in that, this voltage throttle circuit includes:
One unity gain buffer has first input end and is coupled to a compacting voltage, and second input end and an output terminal couple each other mutually, is used for position that voltage with this output terminal is maintained this compacting voltage certainly; And
One compacting diode is coupled between this bleeder circuit and this output terminal, is used for when conducting, keeping the cross-pressure of a forward voltage.
7. short circuit circuit for detecting as claimed in claim 1 is characterized in that, this voltage throttle circuit includes the special diode of at least one Xiao Ji, is coupled to this bleeder circuit, is used for producing a disruptive voltage and constrains this branch pressure voltage.
8. a light-emitting diodes pipe driving chip is characterized in that, includes:
One voltage throttle circuit is used for suppressing the branch pressure voltage that a bleeder circuit is produced, and wherein this bleeder circuit is used for the bottom voltage according to one or more light emitting diode serial, produces this branch pressure voltage less than this bottom voltage;
One drive circuit is used for producing a drive current to drive this one or more light emitting diode serial; And
Whether one comparer is used for relatively this branch pressure voltage and a reference voltage, be short-circuited to decide this one or more light emitting diode serial according to comparative result, and when short circuit takes place, indicate this driving circuit to close this drive current.
9. light-emitting diodes pipe driving chip as claimed in claim 8 is characterized in that, this light-emitting diodes pipe driving chip is a low pressure single-chip that is made with the low pressure processing procedure.
10. light-emitting diodes pipe driving chip as claimed in claim 8 is characterized in that, also comprises at least a portion of this bleeder circuit.
11. a light-emitting diode assembly is characterized in that, includes:
One or more light emitting diode serial; And
Like claim 8 described light-emitting diodes pipe driving chips, be used for driving this one or more light emitting diode serial and detect it and whether be short-circuited.
12. a short circuit method for detecting is characterized in that, includes:
Bottom voltage according to one or more light emitting diode serial produces the branch pressure voltage less than this bottom voltage;
Suppress this branch pressure voltage; And
Relatively whether this branch pressure voltage and a reference voltage are short-circuited to decide this one or more light emitting diode serial according to comparative result.
13. short circuit method for detecting as claimed in claim 12 is characterized in that, the step of suppressing this branch pressure voltage comprises this branch pressure voltage of compacting so that it one of is no more than in the middle of a low operating voltage and the withstand voltage of a chip person.
14. short circuit method for detecting as claimed in claim 12 is characterized in that, the step of suppressing this branch pressure voltage comprises when this bottom electrical presses and is raised to that to reach a certain bits punctual, begin to suppress this branch pressure voltage so that its to be maintained this certain bits in fact accurate.
15. short circuit method for detecting as claimed in claim 12 is characterized in that, the step of suppressing this branch pressure voltage be the drive current that receives in this one or more light emitting diode serial cut off and cause this bottom electrical voltage rise height after quilt implemented.
16. short circuit method for detecting as claimed in claim 12 is characterized in that, the step that produces this branch pressure voltage includes:
Couple one first resistance to this bottom voltage; And
Couple one second resistance to this first resistance, in order to export this branch pressure voltage.
17. short circuit method for detecting as claimed in claim 12 is characterized in that, the step of suppressing this branch pressure voltage includes:
One first input end of one unity gain buffer is coupled to a compacting voltage, and one of which second input end and one of which output terminal couple mutually each other, the position that is maintained this compacting voltage with the voltage with this output terminal certainly; And
Couple a compacting diode between this bleeder circuit and this output terminal, to keep the cross-pressure of a forward voltage when this compacting diode current flow.
18. short circuit method for detecting as claimed in claim 12 is characterized in that, the step of suppressing this branch pressure voltage includes and couples the special diode of at least one Xiao Ji to this bleeder circuit, constrains this branch pressure voltage to produce a disruptive voltage.
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Application publication date: 20120509 |