CN104284474B - LED driver controller, LED driver and LED driving methods - Google Patents
LED driver controller, LED driver and LED driving methods Download PDFInfo
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- CN104284474B CN104284474B CN201310288587.6A CN201310288587A CN104284474B CN 104284474 B CN104284474 B CN 104284474B CN 201310288587 A CN201310288587 A CN 201310288587A CN 104284474 B CN104284474 B CN 104284474B
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Abstract
The invention discloses a kind of LED driver controller, LED driver and LED driving methods, the LED driver controller can include control logic module, the first digital analog converter, multiple backfeed loops and multiple divider resistances, the problem of can solve the problem that in correlation technique by the expansion chip area in drain voltage detection LED strip short-circuit process, increase chip cost.
Description
Technical field
The present embodiments relate to field of LED drive, and in particular to a kind of LED driver controller, LED driver and
LED driving methods.
Background technology
Light emitting diode (Light Emitting Diode, referred to as LED) is widely adopted in a variety of electronic applications,
For example：Architectural lighting, vehicle head taillight, liquid crystal display including personal computer and HDTV backlight with
And flash lamp etc..Compared with the conventional lighting sources of such as incandescent lamp and fluorescent lamp etc, LED has that efficiency high, directionality be good, color
Coloured silk has good stability, reliability high, long lifespan, the remarkable advantage such as small volume and environmental safety.
In order to drive a big LED array using direct current (Direct Current, abbreviation DC) voltage source, it is commonly used
Such as DC-DC switching power managers of boosting, decompression or buck-boost manager etc, top is provided to multiple LED strips
Rail voltage.For example, in using the application of the liquid crystal display (LCD) of LED backlight, using power supervisor to multiple LED strips
Output voltage is provided.It is explained with reference to Fig. 1.
Fig. 1 illustrates the schematic diagram of the LED driver according to correlation technique, as shown in figure 1, the LED driver is included directly
Multiple LED strips of input voltage 11, power supervisor 12 and parallel connection are flowed (only with the first LED strip 13 and the second LED strip 14 in Fig. 1
Exemplified by).Wherein control of the power supervisor 11 in LED driver controller 15, one is provided to multiple LED strips 13,14
Output voltage.
As shown in figure 1, whether there is one or more LED in the first LED strip 13 and/or the second LED strip 14 to detect
The MOSFET1521 and/or second channel adjuster in first passage adjuster 152 are typically directly detected in short circuit, correlation technique
The drain voltage of MOSFET1541 in 154.If certain drain voltage is more than threshold value set in advance, drain voltage correspondence
LED strip 101 in there is one or more LED short circuit, it is on the contrary then short-circuit in the absence of LED.
But, drain voltage may be up to 100V, therefore MOSFET1521 and MOSFET1541 drain electrode is all high-voltage tube
Pin, and in LED driver controller 15 integrated high voltage pipe, can be significantly expanded chip area, increase chip cost.
The content of the invention
The embodiment of the present invention aims to provide a kind of LED driver controller, LED driver and LED driving methods, can solve
The problem of expansion chip area in LED strip short-circuit process is certainly detected in correlation technique by drain voltage, increases chip cost.
The embodiments of the invention provide a kind of LED driver controller, including：Control logic module, is configured as control
One can be external power supervisor, making the power supervisor, there is provided a unidirectional stepping is electric to multiple LED strips in parallel
Pressure；Multiple backfeed loops, are configured to connect with a corresponding LED strip in the multiple LED strip；Multiple partial pressure electricity
Resistance, connects with a corresponding backfeed loop in the multiple backfeed loop respectively；In wherein the multiple backfeed loop
In the case that each partial pressure being configured as on corresponding divider resistance meets predetermined condition, returned to the control logic module
Return corresponding indication signal；Wherein described control logic module is additionally configured to often receive one or more corresponding instructions
Signal, then associatedly record a magnitude of voltage of the unidirectional stepped voltage with one or more corresponding LED strips；And wherein
The control logic module is additionally configured to, from the multiple backfeed loop, all have received the feelings of corresponding indication signal
Under condition, according to the magnitude of voltage recorded, determine whether one or more of the multiple LED strip is short-circuit.
In one embodiment, the control logic module is additionally configured to control the power supervisor, makes the electricity
Source manager improves the unidirectional stepped voltage from first voltage to second voltage, wherein, the first voltage is so that described
The partial pressure on each divider resistance in multiple divider resistances is not up to the voltage of corresponding first threshold set in advance, institute
State the partial pressure that second voltage is so that on each divider resistance in the multiple divider resistance reach it is corresponding in advance
The voltage of the first threshold of setting, and the predetermined condition refer to that the partial pressure on corresponding divider resistance reaches the phase
The first threshold set in advance answered.
In one embodiment, the control logic module is additionally configured to control the power supervisor, makes the electricity
Source manager reduces the unidirectional stepped voltage from tertiary voltage to the 4th voltage, wherein, the tertiary voltage is so that described
The partial pressure on each divider resistance in multiple divider resistances reaches the voltage of corresponding first threshold set in advance, described
The partial pressure that 4th voltage is so that on each divider resistance in the multiple divider resistance is not up to corresponding advance
The voltage of the first threshold of setting, and the predetermined condition partial pressure that refers on corresponding divider resistance be not up to it is described
Corresponding first threshold set in advance.
In one embodiment, each including in the multiple backfeed loop：Difference amplifier, corresponding partial pressure
One end ground connection of resistance, the other end are connected to the first input end of the difference amplifier, for inputting corresponding partial pressure
Ohmically partial pressure, the second input of the difference amplifier is used to input corresponding first threshold set in advance, described
The output end of difference amplifier is used to export corresponding comparative result in an analogue form；And comparator, the of the comparator
One input is connected to the output end of the difference amplifier, for inputting corresponding comparative result, the comparator
Second input is used to input corresponding Second Threshold set in advance, and the output end of the comparator is connected to the logic control
Molding block, for returning to corresponding indication signal to the Logic control module in digital form.
In one embodiment, each also including in the multiple backfeed loop：The first transistor, the first crystal
The grid of pipe is connected to the output end of the difference amplifier, and the drain electrode of the first transistor and source electrode access are the multiple
A corresponding LED strip in LED strip, for according to corresponding comparative result, adjusting the electricity by corresponding LED strip
Stream.
In one embodiment, LED driver controller also includes：Multiple digital analog converters, wherein, each digital-to-analogue conversion
The input of device is connected to the Logic control module, the output end of each digital analog converter respectively with the multiple backfeed loop
In a respective feedback loop the difference amplifier second input connection, for according to the control logic
The setting of module and set corresponding first threshold respectively.
In one embodiment, each including in the multiple backfeed loop：Difference amplifier, corresponding partial pressure
One end ground connection of resistance, the other end are connected to the first input end of the difference amplifier, for inputting corresponding partial pressure
Ohmically partial pressure, the second input of the difference amplifier is used to input corresponding first threshold set in advance, described
The output end of difference amplifier is used to export corresponding comparative result in an analogue form；And the first transistor, described first is brilliant
The grid of body pipe is connected to the output end of the difference amplifier, and the drain electrode of the first transistor and source electrode access are the multiple
A corresponding LED strip in LED strip, for according to corresponding comparative result, adjusting the electricity by corresponding LED strip
Stream；Comparator, the first input end of the comparator is connected to drain electrode or the source electrode of the first transistor, for input and institute
The associated comparative result of corresponding comparative result is stated, the second input of the comparator is used to input to preset accordingly
Second Threshold, the output end of the comparator is connected to the Logic control module, in digital form to the logic
Control module returns to corresponding indication signal.
In one embodiment, the control logic module is additionally configured to calculating and receives refer to corresponding with the first LED strip
Show the magnitude of voltage recorded during signal and receive the voltage difference between the magnitude of voltage recorded during indication signal corresponding with the second LED strip
Value；And it is more than the situation of difference threshold set in advance in the voltage difference for the absolute value of negative and described voltage difference
Under, determine the first LED strip short circuit.
In one embodiment, the control logic module be additionally configured to determination receive it is corresponding to the multiple LED strip
Multiple indication signals when the magnitude of voltage that records among maximum；When calculating receives indication signal corresponding with the first LED strip
Voltage difference between the magnitude of voltage of record and the maximum；And in the voltage difference be negative and described voltage difference
Absolute value be more than difference threshold set in advance in the case of, determine first LED strip short circuit.
In one embodiment, LED driver controller also includes：Multiple second transistors, wherein each second crystal
The grid of pipe is connected to the Logic control module, and the drain electrode of each second transistor and source electrode are accessed in the multiple LED strip
A corresponding LED strip, described in being turned on and off according to the corresponding duty cycle signals that the Logic control module is set
Corresponding LED strip, and the control logic module are additionally configured to the corresponding dutycycle letter of the short-circuit LED strip of determination
Number it is set to zero.
The embodiment of the present invention additionally provides a kind of LED driver, including：Power supervisor, is configured as to many of parallel connection
There is provided a unidirectional stepped voltage for individual LED strip；And according to any of the above-described kind of LED driver controller, it is configured as control
The power supervisor.
Invention further provides a kind of LED driving methods of the LED driver controller of any of the above-described kind of use, including：
Power supervisor that can be external is controlled, making the power supervisor, there is provided a unidirectional stepping to multiple LED strips in parallel
Voltage；In the case that the partial pressure on a divider resistance in multiple divider resistances meets predetermined condition, from corresponding partial pressure
Resistance receives corresponding indication signal, the multiple divider resistance, respectively with a corresponding feedback in multiple backfeed loops
Circuit in series, the multiple backfeed loop is connected with a corresponding LED strip in the multiple LED strip respectively；Often receive one
Individual or multiple corresponding indication signals, then associatedly record the unidirectional stepping electricity with one or more corresponding LED strips
One magnitude of voltage of pressure；And from the multiple backfeed loop, in the case of all have received corresponding indication signal, root
According to the magnitude of voltage recorded, determine whether one or more of the multiple LED strip is short-circuit.
In one embodiment, a power supervisor that can be external is controlled, makes the power supervisor to many of parallel connection
Individual LED strip includes there is provided a unidirectional stepped voltage：The power supervisor is controlled, makes the power supervisor from the first electricity
Press to second voltage and improve the unidirectional stepped voltage, wherein, the first voltage is so that in the multiple divider resistance
Partial pressure on each divider resistance is not up to the voltage of corresponding first threshold set in advance, and the second voltage is so that
The partial pressure on each divider resistance in the multiple divider resistance reaches corresponding first threshold set in advance
Voltage, and the predetermined condition refer to that the partial pressure on corresponding divider resistance reaches corresponding set in advance
One threshold value.
In one embodiment, a power supervisor that can be external is controlled, makes the power supervisor to many of parallel connection
Individual LED strip includes there is provided a unidirectional stepped voltage：The power supervisor is controlled, makes the power supervisor from the 3rd electricity
Pressing to the 4th voltage reduces the unidirectional stepped voltage, wherein, the tertiary voltage is so that in the multiple divider resistance
Partial pressure on each divider resistance reaches the voltage of corresponding first threshold set in advance, and the 4th voltage is so that institute
State the partial pressure on each divider resistance in multiple divider resistances and be not up to corresponding first threshold set in advance
Voltage, and the predetermined condition partial pressure that refers on corresponding divider resistance be not up to it is corresponding set in advance
First threshold.
In one embodiment, the partial pressure on a divider resistance in multiple divider resistances meets the feelings of predetermined condition
Under condition, returning to corresponding indication signal includes：Partial pressure on the corresponding divider resistance of input is corresponding with input
First threshold set in advance is compared and exports corresponding comparative result in an analogue form；And by the phase of input
The comparative result answered is compared with the corresponding Second Threshold set in advance inputted and returns to the phase in digital form
The indication signal answered.
In one embodiment, the partial pressure on a divider resistance in multiple divider resistances meets the feelings of predetermined condition
Under condition, returning to corresponding indication signal also includes：According to corresponding comparative result, regulation passes through corresponding LED strip
Electric current.
In one embodiment, the above method also includes：Set corresponding first threshold respectively according to setting.
In one embodiment, the partial pressure on a divider resistance in multiple divider resistances meets the feelings of predetermined condition
Under condition, returning to corresponding indication signal includes：Partial pressure on the corresponding divider resistance of input is corresponding with input
First threshold set in advance is compared and exports corresponding comparative result in an analogue form；According to corresponding comparison
As a result, the electric current that regulation passes through corresponding LED strip；And by the comparative result associated with corresponding comparative result
Second Threshold set in advance corresponding with input is compared and returns to corresponding indication signal in digital form.
In one embodiment, according to the magnitude of voltage recorded, whether one or more of the multiple LED strip is determined
Short circuit includes：Calculate and receive the magnitude of voltage recorded during indication signal corresponding with the first LED strip and receive corresponding with the second LED strip
Indication signal when the magnitude of voltage that records between voltage difference；And in the voltage difference be negative and described voltage difference
Absolute value be more than difference threshold set in advance in the case of, determine first LED strip short circuit.
In one embodiment, according to the magnitude of voltage recorded, whether one or more of the multiple LED strip is determined
Short circuit includes：It is determined that receiving the maximum among the magnitude of voltage recorded during multiple indication signals corresponding with the multiple LED strip；
Calculating receives the voltage difference between the magnitude of voltage recorded during indication signal corresponding with the first LED strip and the maximum；With
And in the case where the voltage difference is more than difference threshold set in advance for the absolute value of negative and described voltage difference, really
The fixed first LED strip short circuit.
In one embodiment, the above method also includes：The corresponding duty cycle signals of the short-circuit LED strip of determination are set
It is set to zero；And it is turned on and off corresponding LED strip according to the corresponding duty cycle signals of setting.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, this hair
Bright schematic description and description is used to explain the present invention, does not constitute inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 illustrates the schematic diagram of the LED driver according to correlation technique；
Fig. 2 illustrates the schematic diagram of LED driver according to embodiments of the present invention；And
Fig. 3 illustrates the LED driving methods of any of the above-described kind of LED driver of use according to embodiments of the present invention.
Embodiment
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the application can phase
Mutually combination.Describe the present invention in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
Fig. 2 illustrates the schematic diagram of LED driver according to embodiments of the present invention, as shown in Fig. 2 including LED driver
Multiple LED strips 23,24 of controller 21, power supervisor 22 and parallel connection.Wherein, the power supervisor 22 can be configured as
According to the control of LED driver controller 21 a unidirectional stepped voltage is provided to the plurality of LED strip 23,24.
It should be noted that although Fig. 2 merely illustrates two LED strips, the LED driver can drive any quantity
LED strip in parallel.Meanwhile, although the LED driver controller 21 needs to use with power supervisor 22 simultaneously, this is not
The LED driver controller 21 is influenceed still as single production and sale, is continued with and is retouched in detail with reference to Fig. 2
State.
In Fig. 2, the LED driver controller 21 can include control logic module 211, the first digital analog converter 212, many
Individual backfeed loop 213,214 and multiple divider resistances 215,216.Wherein：
The control logic module 211 is configured as that a power supply that can be external can be controlled via the first digital analog converter 212
Manager 22, makes the power supervisor 22 provide a unidirectional stepped voltage to multiple LED strips 23,24 in parallel.This area skill
Art personnel will be understood that the unidirectional stepped voltage both can be that booster voltage can also be step-down voltage, and be especially suitable for
In the start-up course of LED driver controller 21, to find the LED strip of short circuit in time in start-up course.
The plurality of backfeed loop 213,214 is configured to and a corresponding LED strip in multiple LED strips 23,24
23rd, 24 series connection；The plurality of divider resistance 215,216 is corresponding with one in multiple backfeed loops 213,214 respectively to be fed back to
Connect on road 213,214.
Each the partial pressure on corresponding divider resistance 215,216 is configured as in the plurality of backfeed loop 213,214
In the case of meeting predetermined condition, corresponding indication signal is returned to control logic module 211.
The control logic module 211 is additionally configured to often receive one or more corresponding indication signals, then with one or
Multiple corresponding LED strips associatedly record a magnitude of voltage of unidirectional stepped voltage, and are configured as from multiple backfeed loops
213rd, 214 all have received corresponding indication signal in the case of, according to the magnitude of voltage recorded, determine in multiple LED strips 23,24
It is one or more whether short circuit.
In the embodiment of the present invention, control logic module 211 passes through when often receiving one or more corresponding indication signals
The magnitude of voltage of the unidirectional stepped voltage of record determines the short circuit of corresponding LED strip, and these magnitudes of voltage are to more than ten volts between several volts
Low voltage value, therefore the high pressure of the drain electrode in correlation technique is detected without going through integrated high voltage pipe, so as to solve phase
The problem of in the technology of pass.
In one embodiment, control logic module 211 is additionally configured to control the power supervisor 22, makes power management
Device 22 reduces unidirectional stepped voltage and predetermined condition refers to that the partial pressure on corresponding divider resistance 215,216 is not up to accordingly
First threshold set in advance.In the present embodiment, LED driver controller 21 employs the mode of reduced-voltage starting.For example,
LED driver controller 21 control power supervisor 22 from 90 volts to 60 volts with step-length 0.03 volt gradually reduce voltage, wherein, 90
It is corresponding pre- that volt may be such that the partial pressure on each divider resistance 215,216 in multiple divider resistances 215,216 reaches
The voltage of the first threshold first set, 60 volts may be such that in multiple divider resistances 215,216 each divider resistance 215,
Partial pressure on 216 is all not up to the voltage of corresponding first threshold set in advance.In this example, user will experience LED
Change of the screen from bright to dark, hereafter, LED screen will again brighten with the startup of LED driver.
In another embodiment, control logic module 211 is additionally configured to control the power supervisor 22, makes power supply pipe
Reason device 22 raises unidirectional stepped voltage and predetermined condition refers to that the partial pressure on corresponding divider resistance 215,216 reaches accordingly
First threshold set in advance.In the present embodiment, LED driver controller 21 employs the mode that boosting starts.For example,
LED driver controller 21 control power supervisor 22 from 60 volts to 90 volts with step-length 0.03 volt be stepped up voltage, wherein, 60
Volt may be such that the partial pressure on each divider resistance 215,216 in multiple divider resistances 215,216 is not up to accordingly
The voltage of first threshold set in advance, 90 volts of each divider resistances for may be such that in multiple divider resistances 215,216
215th, the partial pressure on 216 all reaches the voltage of corresponding first threshold set in advance.In this example, user will experience
LED screen is from secretly to bright change, hereafter, LED screen keeps brightening in the start-up course of LED driver.Art technology
Personnel will be understood that reduced-voltage starting process (particularly when occurring in its environment dark around) will cause user to be dazzled, thorn
Eye, user feels not good, and start-up course of boosting can improve Consumer's Experience so that LED screen gradually brightens.
In yet another embodiment, the control logic module 211 can control the electricity via digital analog converter (VDAC) 212
Source manager 22, makes power supervisor 22 export unidirectional stepped voltage.It is possible to further set the VDAC and unidirectional stepping electricity
Pressing element has fixed mapping, for example, lower VDAC may map to higher unidirectional stepped voltage.In the present embodiment, may be used
So that the unidirectional stepped voltage of 60 to 90 volts is divided into 1024 parts, VDAC by numeral 0 to 1023 respectively to should be 1024 parts, with
Just the unidirectional stepped voltage is accurately set.
In one embodiment, each backfeed loop 213,214 includes：Difference amplifier 2131,2141 and comparator
2132、2142.Wherein, the first input end of difference amplifier 2131,2141 is connected to one end of divider resistance, the divider resistance
The other end ground connection, for inputting the partial pressure on corresponding divider resistance；Second input of difference amplifier 2131,2141 is used
In the corresponding first threshold set in advance of input；The output end of difference amplifier 2131,2141 is used to export in an analogue form
Corresponding comparative result；The first input end of comparator 2132,2142 is connected to the output end of difference amplifier 2131,2141,
For inputting corresponding comparative result, the second input of comparator 2132,2142 is used to inputting corresponding set in advance the
Two threshold values, the output end of comparator 2132,2142 is connected to Logic control module 211, in digital form to logic control
Module 211 returns to corresponding indication signal.For example, difference amplifier 2131,2141 first input end input preset
First threshold can be 1 volt and the partial pressure on the divider resistance of the second input input can be 0.9 volt, now, difference is put
Big device 2131,2141 can export the analog voltage of amplification.Then, comparator 2132,2142 is by the analog voltage and such as 3 volts
Second Threshold set in advance be compared, if the analog voltage be more than 3 volts, to Logic control module 211 return number
Word indication signal (or output is placed in into high level), digital indication signal (or output is placed in into low level) is not otherwise returned.By
This is visible, in the present embodiment, and only the low voltage value to several volts is measured and compared, and not necessarily passes through integrated high voltage pipe
To detect the high pressure of the drain electrode in correlation technique.It will be understood by those skilled in the art that other feedback circuit forms can also be used
The voltage of divider resistance is measured and compared, these feedback circuit forms should include protection scope of the present invention.
In one embodiment, each backfeed loop 213,214 also includes：The first transistor 2133,2143, first crystal
The grid of pipe 2133,2143 is connected to the output end of difference amplifier 2131,2141, the drain electrode of the first transistor 2133,2143
The corresponding LED strip 23,24 accessed with source electrode in multiple LED strips 23,24, for according to corresponding comparative result, regulation to be logical
Cross the electric current of corresponding LED strip 23,24.In view of LED is current-driven apparatus, this means that the luminous flux produced by LED strip
It is mainly related to by the average current of LED strip.Therefore, it is in order to ensure the brightness of each LED strip is identical, then brilliant by first
Body pipe 2133,2143 sets the average current of each LED strip must be identical.
In one embodiment, LED driver controller also includes：Multiple digital analog converters (IDAC) 217,218, its
In, the input of each digital analog converter 217,218 is connected to Logic control module 211, each digital analog converter 217,218
Output end difference amplifier 2131 respectively with the respective feedback loop 213,214 in multiple backfeed loops 213,214,
2141 the second input connection, corresponding first threshold is set for the setting according to control logic module 211 respectively.Example
Such as, the first threshold of 0 to 5 volt can be divided into 1024 parts, control logic module 211 is corresponded to respectively by numeral 0 to 1023
This 1024 parts, accurately to set first threshold.
In one embodiment, each including in the plurality of backfeed loop 213,214：Difference amplifier 2131,2141,
Comparator 2132,2142 and the first transistor 2133,2143.Wherein, the first input end connection of difference amplifier 2131,2141
To one end of divider resistance, the other end of the divider resistance is grounded, for inputting the partial pressure on corresponding divider resistance；Difference is put
Second input of big device 2131,2141 is used to input corresponding first threshold set in advance；Difference amplifier 2131,2141
Output end be used for export corresponding comparative result in an analogue form.The grid of the first transistor 2133,2143 is connected to difference
The output end of amplifier 2131,2141, the drain electrode of the first transistor 2133,2143 and source electrode are accessed in multiple LED strips 23,24
One corresponding LED strip 23,24, for according to corresponding comparative result, adjusting the electric current by corresponding LED strip 23,24.Compare
The first input end of device 2132,2142 is connected to drain electrode or the source electrode of the first transistor 2133,2143, for input with it is corresponding
The associated comparative result of comparative result, the second input of comparator 2132,2142 is corresponding set in advance for inputting
Second Threshold, the output end of comparator 2132,2142 is connected to Logic control module 211, in digital form to logic control
Molding block 211 returns to corresponding indication signal.In the present embodiment, the first input end of comparator 2132,2142 is connected to
The drain electrode of one transistor 2133,2143 or source electrode.Although now there is high pressure pin, compared in correlation technique in order to
Detection short circuit and in drain electrode it is another connect the circuit of comparator for, the present embodiment still can save logical sum area.
In one embodiment, control logic module 211 is additionally configured to that calculating is received and the first LED strip 23 is corresponding refers to
Show the magnitude of voltage recorded during signal and receive the voltage between the magnitude of voltage recorded during with the second 24 corresponding indication signal of LED strip
Difference；And in the case where voltage difference is more than difference threshold set in advance for the absolute value of negative and voltage difference, really
The fixed short circuit of first LED strip 23.Or, control logic module 211 be additionally configured to determination receive it is corresponding with multiple LED strips multiple
Maximum among the magnitude of voltage recorded during indication signal；Calculating is recorded when receiving with the first 23 corresponding indication signal of LED strip
Magnitude of voltage and maximum between voltage difference；And be more than in voltage difference for the absolute value of negative and voltage difference advance
In the case of the difference threshold of setting, the short circuit of the first LED strip 23 is determined.Generally, each LED in LED strip must be big at one
About 2.5 volts to 3.5 volts of forward voltage falls operation, if wherein one or more LED are short-circuit, the forward voltage of the LED
General who has surrendered's vanishing.This allows for corresponding divider resistance and is issued to corresponding first threshold in relatively low unidirectional stepped voltage, i.e.
Short-circuit LED is more in LED strip, and the magnitude of voltage that it is recorded is lower.Therefore, if the brownout of certain LED strip record, in other words
Say, the difference of the voltage and the voltage of other LED strips record of LED strip record exceedes difference threshold set in advance, then the LED
There are one or more LED short circuits in string.
In an embodiment that the power supervisor 22 is controlled via above-mentioned VDAC, the maximum of the voltage of above-mentioned record
It may map to VDAC minimum value.Therefore, for each LED strip, if the difference between its VDAC and the minimum value of the VDAC
Different to be more than VDAC threshold values set in advance, then there are one or more LED short circuits in the LED strip.In the present embodiment, by magnitude of voltage
Comparison be converted to the comparisons of VDAC values, be not only easy to measure, compare, and computational efficiency can be improved.
In one embodiment, LED driver controller also includes：Multiple second transistors 219,210, wherein each
The grid of two-transistor 219,210 is connected to Logic control module 211, the drain electrode of each second transistor 219,210 and source electrode
The corresponding LED strip 23,24 accessed in multiple LED strips 23,24, for according to Logic control module 211 set it is corresponding
Duty cycle signals are turned on and off corresponding LED strip 23,24, and control logic module 211 is additionally configured to the short of determination
The corresponding duty cycle signals of the LED strip 23,24 on road are set to zero.In the present embodiment, if certain LED strip has one or many
Individual LED short circuits, control logic module 211 can be by being set to zero so as to close the LED strip by corresponding duty cycle signals, this
Sample can avoid the short circuit of the LED strip from bringing larger heating to the device in LED driver controller, to protect the LED
Driver controller.If, can also not it will be understood by those skilled in the art that certain LED strip has one or more LED short circuit
Close the LED strip and take other measures to solve the heating problem, can so cause only occur several dim spots in LED screen
Rather than a whole piece concealed wire.
Fig. 3 illustrates the LED driving methods of any of the above-described kind of LED driver of use according to embodiments of the present invention, the party
Method can include steps S302 to step S308.
Step S302, the power supervisor 22 that control one can be external makes power supervisor 22 to multiple LED strips in parallel
23rd, 24 a unidirectional stepped voltage is provided.
Partial pressure on step S304, the divider resistance 215,216 in multiple divider resistances 215,216 meets predetermined
In the case of condition, corresponding indication signal is received from corresponding divider resistance, multiple divider resistances 215,216 respectively with it is multiple
One in backfeed loop 213,214 corresponding backfeed loop 213,214 is connected, multiple backfeed loops 213,214 respectively with it is many
A corresponding LED strip 23,24 in individual LED strip 23,24 is connected.
Step S306, often receives one or more corresponding indication signals, then is associated with one or more corresponding LED strips
Ground records a magnitude of voltage of unidirectional stepped voltage.
Step S308, in the case where all have received corresponding indication signal from multiple backfeed loops 213,214, according to institute
The magnitude of voltage of record, determines whether multiple LED strips 23, one or more of 24 are short-circuit.
In one embodiment, step S302 can include：Power supervisor 22 is controlled, makes power supervisor 22 from first
Voltage improves unidirectional stepped voltage to second voltage, wherein, first voltage is so that each in multiple divider resistances 215,216
Partial pressure on divider resistance 215,216 is all not up to the voltage of corresponding first threshold set in advance, and second voltage is so that
The partial pressure on each divider resistance 215,216 in multiple divider resistances 215,216 reaches corresponding set in advance first
The voltage of threshold value, and the predetermined condition partial pressure that refers on corresponding divider resistance 215,216 reach it is corresponding set in advance
First threshold.
In one embodiment, step S302 can include：Power supervisor 22 is controlled, makes power supervisor 22 from the 3rd
Voltage reduces unidirectional stepped voltage to the 4th voltage, wherein, tertiary voltage is so that each in multiple divider resistances 215,216
Partial pressure on divider resistance 215,216 all reaches the voltage of corresponding first threshold set in advance, and the 4th voltage is so that many
The partial pressure on each divider resistance 215,216 in individual divider resistance 215,216 is not up to corresponding set in advance first
The voltage of threshold value, and the predetermined condition partial pressure that refers on corresponding divider resistance 215,216 are not up to and preset accordingly
First threshold.Wherein it is possible to set corresponding first threshold respectively according to setting.
In one embodiment, step S304 can include：By the partial pressure on the corresponding divider resistance of input and input
Corresponding first threshold set in advance be compared and export corresponding comparative result in an analogue form；And will input
Corresponding comparative result be compared with the corresponding Second Threshold set in advance inputted and return to phase in digital form
The indication signal answered.Wherein it is possible to set corresponding first threshold respectively according to setting.
In one embodiment, step S304 can also include：According to corresponding comparative result, regulation passes through corresponding
The electric current of LED strip 23,24.
In one embodiment, step S304 can include：By the partial pressure on the corresponding divider resistance of input and input
Corresponding first threshold set in advance be compared and export corresponding comparative result in an analogue form；According to corresponding
Comparative result, adjusts the electric current by corresponding LED strip 23,24；And the comparison knot being associated with corresponding comparative result
Fruit Second Threshold set in advance corresponding with input is compared and returns to corresponding indication signal in digital form.
In one embodiment, step S308 can include：When calculating is received with the first 23 corresponding indication signal of LED strip
The magnitude of voltage of record and receive the voltage difference between the magnitude of voltage recorded during with the second 24 corresponding indication signal of LED strip；With
And in the case where voltage difference is more than difference threshold set in advance for the absolute value of negative and voltage difference, determine first
The short circuit of LED strip 23.
In one embodiment, step S308 can include：It is determined that receiving multiple indication signals corresponding with multiple LED strips
Maximum among Shi Jilu magnitude of voltage；Calculate the magnitude of voltage for receiving and being recorded during with the first 23 corresponding indication signal of LED strip
Voltage difference between maximum；And it is more than difference set in advance in the absolute value that voltage difference is negative and voltage difference
In the case of being worth threshold value, the short circuit of the first LED strip 23 is determined.
In one embodiment, after step S308, the above method also includes：By the short-circuit LED strip 23,24 of determination
Corresponding duty cycle signals be set to zero；And it is turned on and off corresponding LED according to the corresponding duty cycle signals of setting
String 23,24.In the present embodiment, can be by by corresponding dutycycle if certain LED strip has one or more LED short circuit
Signal is set to zero to close the LED strip, can so avoid the short circuit of the LED strip to the device in LED driver controller
Part brings larger heating, to protect the LED driver controller.If it will be understood by those skilled in the art that certain LED strip
There are one or more LED short circuits, the LED strip can not also be closed and take other measures to solve the heating problem, so may be used
Only to occur in LED screen several dim spots rather than a whole piece concealed wire.
In summary, according to the abovementioned embodiments of the present invention there is provided a kind of LED driver controller, LED driver and
LED driving methods, can solve the problem that in correlation technique by drain voltage detect LED strip short-circuit process in expansion chip area,
The problem of increasing chip cost, meanwhile, connection of the embodiment of the present invention is simple, and less electricity can be used on chip or in chip
Sub-component and pin.
Obviously, those skilled in the art should be understood that above-mentioned each module of the invention or each step can be with general
Computing device realize that they can be concentrated on single computing device, or be distributed in multiple computing devices and constituted
Network on, alternatively, the program code that they can be can perform with computing device be realized, so as to being stored in
Performed in storage device by computing device, they are either fabricated to each integrated circuit modules respectively or by them
Multiple modules or step single integrated circuit module is fabricated to realize.So, the present invention is not restricted to any specific hard
Part and software are combined.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (34)
1. a kind of LED driver controller, including：
Control logic module (211), is configured as the power supervisor (22) that control one can be external, makes the power supervisor
(22) a unidirectional stepped voltage is provided to the respective first end of multiple LED strips (23,24) in parallel；And
Multiple backfeed loops (213,214) and multiple divider resistances (215,216), wherein the multiple LED strip respective second
Hold the respective feedback loop (213,214) in the multiple backfeed loop (213,214) has been sequentially connected in series and the multiple point
It is grounded after corresponding divider resistance in piezoresistance (215,216)；
Being each configured as on corresponding divider resistance (215,216) in wherein the multiple backfeed loop (213,214)
Partial pressure meet predetermined condition in the case of, return to corresponding indication signal to the control logic module (211)；
Wherein described control logic module (211) is additionally configured to：
One or more corresponding indication signals are often received, then associatedly record institute with one or more corresponding LED strips
State a magnitude of voltage of unidirectional stepped voltage；And
In the case where all have received corresponding indication signal from the multiple backfeed loop (213,214), according to being remembered
Multiple magnitudes of voltage of record, determine whether one or more of the multiple LED strip (23,24) is short-circuit, if wherein described many
The difference of a magnitude of voltage respectively between other magnitudes of voltage in individual magnitude of voltage exceedes difference threshold set in advance, then institute
State control logic module (211) and determine there is LED short circuits in the LED strip associated with one magnitude of voltage；And
Wherein described control logic module (211) is additionally configured to control the power supervisor (22), makes the power management
Device (22) improves the unidirectional stepped voltage from first voltage to second voltage, wherein, the first voltage is so that described many
The partial pressure on each divider resistance (215,216) in individual divider resistance (215,216) is all not up to corresponding set in advance
The voltage of first threshold, the second voltage is so that each divider resistance in the multiple divider resistance (215,216)
Partial pressure on (215,216) all reaches the voltage of corresponding first threshold set in advance, and
It is corresponding advance that wherein described predetermined condition refers to that the partial pressure on corresponding divider resistance (215,216) reaches
The first threshold of setting.
2. LED driver controller according to claim 1, wherein every in the multiple backfeed loop (213,214)
It is individual including：
Difference amplifier (2131,2141), one end ground connection of corresponding divider resistance, the other end are connected to the difference and put
The first input end of big device (2131,2141), for inputting the partial pressure on corresponding divider resistance, the difference amplifier
Second input of (2131,2141) is used to inputting corresponding first threshold set in advance, the difference amplifier (2131,
2141) output end is used to export corresponding comparative result in an analogue form；And
Comparator (2132,2142), the first input end of the comparator (2132,2142) is connected to the difference amplifier
The output end of (2131,2141), for inputting corresponding comparative result, the second of the comparator (2132,2142) is defeated
Entering end is used to inputting corresponding Second Threshold set in advance, and the output end of the comparator (2132,2142) is connected to described
Logic control module (211), believes for returning to corresponding instruction to the Logic control module (211) in digital form
Number.
3. LED driver controller according to claim 2, wherein every in the multiple backfeed loop (213,214)
It is individual also to include：
The first transistor (2133,2143), the grid of the first transistor (2133,2143) is connected to the difference amplifier
The output end of (2131,2141), in the drain electrode of the first transistor (2133,2143) and the multiple LED strip (23,24)
The second end connection of one corresponding LED strip (23,24), the source electrode of the first transistor (2133,2143) passes through the multiple
A corresponding divider resistance ground connection in divider resistance (215,216), the first transistor (2133,2143) is used for according to institute
Corresponding comparative result is stated, the electric current by corresponding LED strip (23,24) is adjusted.
4. LED driver controller according to claim 2, in addition to：Multiple digital analog converters (217,218), wherein,
The input of each digital analog converter (217,218) is connected to the Logic control module (211), each digital analog converter
The output end of (217,218) respectively with a respective feedback loop (213,214) in the multiple backfeed loop (213,214)
The difference amplifier (2131,2141) second input connection, for according to the control logic module (211)
Setting and set corresponding first threshold respectively.
5. LED driver controller according to claim 1, wherein, it is every in the multiple backfeed loop (213,214)
It is individual including：
Difference amplifier (2131,2141), one end ground connection of corresponding divider resistance, the other end are connected to the difference and put
The first input end of big device (2131,2141), for inputting the partial pressure on corresponding divider resistance, the difference amplifier
Second input of (2131,2141) is used to inputting corresponding first threshold set in advance, the difference amplifier (2131,
2141) output end is used to export corresponding comparative result in an analogue form；
The first transistor (2133,2143), the grid of the first transistor (2133,2143) is connected to the difference amplifier
The output end of (2131,2141), in the drain electrode of the first transistor (2133,2143) and the multiple LED strip (23,24)
The second end connection of one corresponding LED strip (23,24), the source electrode of the first transistor (2133,2143) passes through the multiple
A corresponding divider resistance ground connection in divider resistance (215,216), the first transistor (2133,2143) is used for according to institute
Corresponding comparative result is stated, the electric current by corresponding LED strip (23,24) is adjusted；And
Comparator (2132,2142), the first input end of the comparator (2132,2142) is connected to the first transistor
The drain electrode of (2133,2143) or source electrode, for inputting the comparative result associated with corresponding comparative result, the comparison
Second input of device (2132,2142) is used to inputting corresponding Second Threshold set in advance, the comparator (2132,
2142) output end is connected to the Logic control module (211), in digital form to the Logic control module
(211) corresponding indication signal is returned.
6. LED driver controller according to any one of claim 1 to 5, wherein, the control logic module
(211) calculating is additionally configured to receive the magnitude of voltage recorded during with the first LED strip (23) corresponding indication signal and receive and the
Voltage difference between the magnitude of voltage recorded during the corresponding indication signal of two LED strips (24)；And in the voltage difference be negative
And in the case that the absolute value of the voltage difference is more than difference threshold set in advance, determine first LED strip (23)
Short circuit.
7. LED driver controller according to any one of claim 1 to 5, wherein, the control logic module
(211) it is additionally configured to determine to receive among the magnitude of voltage recorded during multiple indication signals corresponding with the multiple LED strip
Maximum；Calculating is received between the magnitude of voltage recorded during with the first LED strip (23) corresponding indication signal and the maximum
Voltage difference；And it is more than difference threshold set in advance in the absolute value that the voltage difference is negative and described voltage difference
In the case of, determine the first LED strip (23) short circuit.
8. LED driver controller according to any one of claim 1 to 5, in addition to：Multiple second transistors
(219,210), wherein the grid of each second transistor (219,210) is connected to the Logic control module (211), Mei Ge
The drain electrode of two-transistor (219,210) and the second end of a corresponding LED strip (23,24) in the multiple LED strip (23,24)
Connection, the source electrode of each second transistor (219,210) is connected with the drain electrode of corresponding the first transistor (2133,2143), often
The corresponding duty cycle signals that individual second transistor (219,210) is used to be set according to the Logic control module (211) are opened
Or corresponding LED strip (23,24) is closed, and
The control logic module (211) is additionally configured to the corresponding dutycycle letter of the short-circuit LED strip (23,24) of determination
Number it is set to zero.
9. a kind of LED driver, including：
Power supervisor (22), is configured as providing a unidirectional stepped voltage to multiple LED strips (23,24) in parallel；And
LED driver controller (21) according to any one of claim 1 to 8, is configured as controlling the power supply pipe
Manage device (22).
10. a kind of LED driving methods of the LED driver controller any one of usage right requirement 1 to 8, including：
Control one can be external power supervisor (22), make the power supervisor (22) in parallel multiple LED strips (23,
24) a unidirectional stepped voltage is provided；
The partial pressure on a divider resistance (215,216) in multiple divider resistances (215,216) meets the feelings of predetermined condition
Under condition, corresponding indication signal is received from corresponding divider resistance, the multiple divider resistance (215,216) respectively with it is multiple anti-
Corresponding backfeed loop (213, a 214) series connection being fed back in road (213,214), the multiple backfeed loop (213,214)
Connected respectively with a corresponding LED strip (23,24) in the multiple LED strip (23,24)；
One or more corresponding indication signals are often received, then associatedly record institute with one or more corresponding LED strips
State a magnitude of voltage of unidirectional stepped voltage；And
In the case where all have received corresponding indication signal from the multiple backfeed loop (213,214), according to being remembered
The magnitude of voltage of record, determines whether one or more of the multiple LED strip (23,24) is short-circuit, if wherein what is recorded is multiple
The difference of a magnitude of voltage respectively between other magnitudes of voltage in magnitude of voltage exceedes difference threshold set in advance, then it is determined that
There is LED short circuits in the LED strip associated with one magnitude of voltage；
Power supervisor (22) that can be external is wherein controlled, makes the power supervisor (22) to multiple LED strips in parallel
(23,24) providing a unidirectional stepped voltage includes：Control the power supervisor (22), make the power supervisor (22) from
First voltage improves the unidirectional stepped voltage to second voltage, wherein, the first voltage is so that the multiple partial pressure electricity
The partial pressure on each divider resistance (215,216) in resistance (215,216) is all not up to corresponding first threshold set in advance
Voltage, the second voltage is so that on each divider resistance (215,216) in the multiple divider resistance (215,216)
Partial pressure all reach the voltage of corresponding first threshold set in advance, and
It is corresponding advance that wherein described predetermined condition refers to that the partial pressure on corresponding divider resistance (215,216) reaches
The first threshold of setting.
11. method according to claim 10, wherein, a divider resistance in multiple divider resistances (215,216)
In the case that partial pressure on (215,216) meets predetermined condition, returning to corresponding indication signal includes：
Partial pressure on the corresponding divider resistance of input is compared with the corresponding first threshold set in advance inputted
Compared with and export corresponding comparative result in an analogue form；And
By the corresponding comparative result of input with input corresponding Second Threshold set in advance be compared and with
Digital form returns to corresponding indication signal.
12. method according to claim 11, wherein, a divider resistance in multiple divider resistances (215,216)
In the case that partial pressure on (215,216) meets predetermined condition, returning to corresponding indication signal also includes：According to corresponding
Comparative result, adjusts the electric current by corresponding LED strip (23,24).
13. method according to claim 11, in addition to：Set corresponding first threshold respectively according to setting.
14. method according to claim 10, wherein, a divider resistance in multiple divider resistances (215,216)
In the case that partial pressure on (215,216) meets predetermined condition, returning to corresponding indication signal includes：
Partial pressure on the corresponding divider resistance of input is compared with the corresponding first threshold set in advance inputted
Compared with and export corresponding comparative result in an analogue form；
According to corresponding comparative result, the electric current by corresponding LED strip (23,24) is adjusted；And
It will enter with the comparative result that corresponding comparative result is associated with the corresponding Second Threshold set in advance inputted
Row compares and returns to corresponding indication signal in digital form.
15. the method according to any one of claim 10 to 14, according to the magnitude of voltage recorded, is determined the multiple
Whether short circuit includes one or more of LED strip (23,24)：
Calculating receives the magnitude of voltage recorded during with the first LED strip (23) corresponding indication signal and received and the second LED strip (24)
Voltage difference between the magnitude of voltage recorded during corresponding indication signal；And
In the case where the voltage difference is more than difference threshold set in advance for the absolute value of negative and described voltage difference,
Determine the first LED strip (23) short circuit.
16. the method according to any one of claim 10 to 14, according to the magnitude of voltage recorded, is determined the multiple
Whether short circuit includes one or more of LED strip (23,24)：
It is determined that receiving the maximum among the magnitude of voltage recorded during multiple indication signals corresponding with the multiple LED strip；
Calculating receives the voltage between the magnitude of voltage recorded during with the first LED strip (23) corresponding indication signal and the maximum
Difference；And
In the case where the voltage difference is more than difference threshold set in advance for the absolute value of negative and described voltage difference,
Determine the first LED strip (23) short circuit.
17. the method according to any one of claim 10 to 14, in addition to：
The corresponding duty cycle signals of the short-circuit LED strip (23,24) of determination are set to zero；And
Corresponding LED strip (23,24) is turned on and off according to the corresponding duty cycle signals of setting.
18. a kind of LED driver controller, including：
Control logic module (211), is configured as the power supervisor (22) that control one can be external, makes the power supervisor
(22) a unidirectional stepped voltage is provided to the respective first end of multiple LED strips (23,24) in parallel；And
Multiple backfeed loops (213,214) and multiple divider resistances (215,216), wherein the multiple LED strip respective second
Hold the respective feedback loop (213,214) in the multiple backfeed loop (213,214) has been sequentially connected in series and the multiple point
It is grounded after corresponding divider resistance in piezoresistance (215,216)；
Being each configured as on corresponding divider resistance (215,216) in wherein the multiple backfeed loop (213,214)
Partial pressure meet predetermined condition in the case of, return to corresponding indication signal to the control logic module (211)；
Wherein described control logic module (211) is additionally configured to：
One or more corresponding indication signals are often received, then associatedly record institute with one or more corresponding LED strips
State a magnitude of voltage of unidirectional stepped voltage；And
In the case where all have received corresponding indication signal from the multiple backfeed loop (213,214), according to being remembered
Multiple magnitudes of voltage of record, determine whether one or more of the multiple LED strip (23,24) is short-circuit, if wherein described many
The difference of a magnitude of voltage respectively between other magnitudes of voltage in individual magnitude of voltage exceedes difference threshold set in advance, then institute
State control logic module (211) and determine there is LED short circuits in the LED strip associated with one magnitude of voltage；And
Wherein described control logic module (211) is additionally configured to control the power supervisor (22), makes the power management
Device (22) reduces the unidirectional stepped voltage from tertiary voltage to the 4th voltage, wherein, the tertiary voltage is so that described many
The partial pressure on each divider resistance (215,216) in individual divider resistance (215,216) all reaches corresponding set in advance the
The voltage of one threshold value, the 4th voltage be so that in the multiple divider resistance (215,216) each divider resistance (215,
216) partial pressure on is all not up to the voltage of corresponding first threshold set in advance, and
It is corresponding pre- that wherein described predetermined condition refers to that the partial pressure on corresponding divider resistance (215,216) is not up to
The first threshold first set.
19. LED driver controller according to claim 18, wherein in the multiple backfeed loop (213,214)
Each include：
Difference amplifier (2131,2141), one end ground connection of corresponding divider resistance, the other end are connected to the difference and put
The first input end of big device (2131,2141), for inputting the partial pressure on corresponding divider resistance, the difference amplifier
Second input of (2131,2141) is used to inputting corresponding first threshold set in advance, the difference amplifier (2131,
2141) output end is used to export corresponding comparative result in an analogue form；And
Comparator (2132,2142), the first input end of the comparator (2132,2142) is connected to the difference amplifier
The output end of (2131,2141), for inputting corresponding comparative result, the second of the comparator (2132,2142) is defeated
Entering end is used to inputting corresponding Second Threshold set in advance, and the output end of the comparator (2132,2142) is connected to described
Logic control module (211), believes for returning to corresponding instruction to the Logic control module (211) in digital form
Number.
20. LED driver controller according to claim 19, wherein in the multiple backfeed loop (213,214)
Each also include：
The first transistor (2133,2143), the grid of the first transistor (2133,2143) is connected to the difference amplifier
The output end of (2131,2141), in the drain electrode of the first transistor (2133,2143) and the multiple LED strip (23,24)
The second end connection of one corresponding LED strip (23,24), the source electrode of the first transistor (2133,2143) passes through the multiple
A corresponding divider resistance ground connection in divider resistance (215,216), the first transistor (2133,2143) is used for according to institute
Corresponding comparative result is stated, the electric current by corresponding LED strip (23,24) is adjusted.
21. LED driver controller according to claim 19, in addition to：Multiple digital analog converters (217,218), its
In, the input of each digital analog converter (217,218) is connected to the Logic control module (211), each digital analog converter
The output end of (217,218) respectively with a respective feedback loop (213,214) in the multiple backfeed loop (213,214)
The difference amplifier (2131,2141) second input connection, for according to the control logic module (211)
Setting and set corresponding first threshold respectively.
22. LED driver controller according to claim 18, wherein, in the multiple backfeed loop (213,214)
Each include：
Difference amplifier (2131,2141), one end ground connection of corresponding divider resistance, the other end are connected to the difference and put
The first input end of big device (2131,2141), for inputting the partial pressure on corresponding divider resistance, the difference amplifier
Second input of (2131,2141) is used to inputting corresponding first threshold set in advance, the difference amplifier (2131,
2141) output end is used to export corresponding comparative result in an analogue form；
The first transistor (2133,2143), the grid of the first transistor (2133,2143) is connected to the difference amplifier
The output end of (2131,2141), in the drain electrode of the first transistor (2133,2143) and the multiple LED strip (23,24)
The second end connection of one corresponding LED strip (23,24), the source electrode of the first transistor (2133,2143) passes through the multiple
A corresponding divider resistance ground connection in divider resistance (215,216), the first transistor (2133,2143) is used for according to institute
Corresponding comparative result is stated, the electric current by corresponding LED strip (23,24) is adjusted；And
Comparator (2132,2142), the first input end of the comparator (2132,2142) is connected to the first transistor
The drain electrode of (2133,2143) or source electrode, for inputting the comparative result associated with corresponding comparative result, the comparison
Second input of device (2132,2142) is used to inputting corresponding Second Threshold set in advance, the comparator (2132,
2142) output end is connected to the Logic control module (211), in digital form to the Logic control module
(211) corresponding indication signal is returned.
23. the LED driver controller according to any one of claim 18 to 22, wherein, the control logic module
(211) calculating is additionally configured to receive the magnitude of voltage recorded during with the first LED strip (23) corresponding indication signal and receive and the
Voltage difference between the magnitude of voltage recorded during the corresponding indication signal of two LED strips (24)；And in the voltage difference be negative
And in the case that the absolute value of the voltage difference is more than difference threshold set in advance, determine first LED strip (23)
Short circuit.
24. the LED driver controller according to any one of claim 18 to 22, wherein, the control logic module
(211) it is additionally configured to determine to receive among the magnitude of voltage recorded during multiple indication signals corresponding with the multiple LED strip
Maximum；Calculating is received between the magnitude of voltage recorded during with the first LED strip (23) corresponding indication signal and the maximum
Voltage difference；And it is more than difference threshold set in advance in the absolute value that the voltage difference is negative and described voltage difference
In the case of, determine the first LED strip (23) short circuit.
25. the LED driver controller according to any one of claim 18 to 22, in addition to：Multiple second transistors
(219,210), wherein the grid of each second transistor (219,210) is connected to the Logic control module (211), Mei Ge
The drain electrode of two-transistor (219,210) and the second end of a corresponding LED strip (23,24) in the multiple LED strip (23,24)
Connection, the source electrode of each second transistor (219,210) is connected with the drain electrode of corresponding the first transistor (2133,2143), often
The corresponding duty cycle signals that individual second transistor (219,210) is used to be set according to the Logic control module (211) are opened
Or corresponding LED strip (23,24) is closed, and
The control logic module (211) is additionally configured to the corresponding dutycycle letter of the short-circuit LED strip (23,24) of determination
Number it is set to zero.
26. a kind of LED driver, including：
Power supervisor (22), is configured as providing a unidirectional stepped voltage to multiple LED strips (23,24) in parallel；And
LED driver controller (21) according to any one of claim 18 to 25, is configured as controlling the power supply
Manager (22).
27. a kind of LED driving methods of the LED driver controller any one of usage right requirement 18 to 25, including：
Control one can be external power supervisor (22), make the power supervisor (22) in parallel multiple LED strips (23,
24) a unidirectional stepped voltage is provided；
The partial pressure on a divider resistance (215,216) in multiple divider resistances (215,216) meets the feelings of predetermined condition
Under condition, corresponding indication signal is received from corresponding divider resistance, the multiple divider resistance (215,216) respectively with it is multiple anti-
Corresponding backfeed loop (213, a 214) series connection being fed back in road (213,214), the multiple backfeed loop (213,214)
Connected respectively with a corresponding LED strip (23,24) in the multiple LED strip (23,24)；
One or more corresponding indication signals are often received, then associatedly record institute with one or more corresponding LED strips
State a magnitude of voltage of unidirectional stepped voltage；And
In the case where all have received corresponding indication signal from the multiple backfeed loop (213,214), according to being remembered
The magnitude of voltage of record, determines whether one or more of the multiple LED strip (23,24) is short-circuit, if wherein what is recorded is multiple
The difference of a magnitude of voltage respectively between other magnitudes of voltage in magnitude of voltage exceedes difference threshold set in advance, then it is determined that
There is LED short circuits in the LED strip associated with one magnitude of voltage；
Power supervisor (22) that can be external is wherein controlled, makes the power supervisor (22) to multiple LED strips in parallel
(23,24) providing a unidirectional stepped voltage includes：Control the power supervisor (22), make the power supervisor (22) from
Tertiary voltage reduces the unidirectional stepped voltage to the 4th voltage, wherein, the tertiary voltage is so that the multiple partial pressure electricity
The partial pressure on each divider resistance (215,216) in resistance (215,216) all reaches corresponding first threshold set in advance
Voltage, the 4th voltage is so that on each divider resistance (215,216) in the multiple divider resistance (215,216)
Partial pressure is all not up to the voltage of corresponding first threshold set in advance, and
It is corresponding pre- that wherein described predetermined condition refers to that the partial pressure on corresponding divider resistance (215,216) is not up to
The first threshold first set.
28. method according to claim 27, wherein, a divider resistance in multiple divider resistances (215,216)
In the case that partial pressure on (215,216) meets predetermined condition, returning to corresponding indication signal includes：
Partial pressure on the corresponding divider resistance of input is compared with the corresponding first threshold set in advance inputted
Compared with and export corresponding comparative result in an analogue form；And
By the corresponding comparative result of input with input corresponding Second Threshold set in advance be compared and with
Digital form returns to corresponding indication signal.
29. method according to claim 28, wherein, a divider resistance in multiple divider resistances (215,216)
In the case that partial pressure on (215,216) meets predetermined condition, returning to corresponding indication signal also includes：According to corresponding
Comparative result, adjusts the electric current by corresponding LED strip (23,24).
30. method according to claim 28, in addition to：Set corresponding first threshold respectively according to setting.
31. method according to claim 27, wherein, a divider resistance in multiple divider resistances (215,216)
In the case that partial pressure on (215,216) meets predetermined condition, returning to corresponding indication signal includes：
Partial pressure on the corresponding divider resistance of input is compared with the corresponding first threshold set in advance inputted
Compared with and export corresponding comparative result in an analogue form；
According to corresponding comparative result, the electric current by corresponding LED strip (23,24) is adjusted；And
It will enter with the comparative result that corresponding comparative result is associated with the corresponding Second Threshold set in advance inputted
Row compares and returns to corresponding indication signal in digital form.
32. the method according to any one of claim 27 to 31, according to the magnitude of voltage recorded, is determined the multiple
Whether short circuit includes one or more of LED strip (23,24)：
Calculating receives the magnitude of voltage recorded during with the first LED strip (23) corresponding indication signal and received and the second LED strip (24)
Voltage difference between the magnitude of voltage recorded during corresponding indication signal；And
In the case where the voltage difference is more than difference threshold set in advance for the absolute value of negative and described voltage difference,
Determine the first LED strip (23) short circuit.
33. the method according to any one of claim 27 to 31, according to the magnitude of voltage recorded, is determined the multiple
Whether short circuit includes one or more of LED strip (23,24)：
It is determined that receiving the maximum among the magnitude of voltage recorded during multiple indication signals corresponding with the multiple LED strip；
Calculating receives the voltage between the magnitude of voltage recorded during with the first LED strip (23) corresponding indication signal and the maximum
Difference；And
In the case where the voltage difference is more than difference threshold set in advance for the absolute value of negative and described voltage difference,
Determine the first LED strip (23) short circuit.
34. the method according to any one of claim 27 to 31, in addition to：
The corresponding duty cycle signals of the short-circuit LED strip (23,24) of determination are set to zero；And
Corresponding LED strip (23,24) is turned on and off according to the corresponding duty cycle signals of setting.
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| US8334662B2 (en) * | 2009-09-11 | 2012-12-18 | Iwatt Inc. | Adaptive switch mode LED driver |
| CN102123536B (en) * | 2010-01-12 | 2013-10-30 | 冠捷投资有限公司 | Light-emitting diode driving circuit |
| US8456095B2 (en) * | 2010-03-19 | 2013-06-04 | Active-Semi, Inc. | Reduced flicker AC LED lamp with separately shortable sections of an LED string |
| CN103037597B (en) * | 2013-01-06 | 2015-03-25 | 深圳创维－Rgb电子有限公司 | Multi-channel LED (Light Emitting Diode) constant current control circuit and LED light source control system |
| CN203457366U (en) * | 2013-07-10 | 2014-02-26 | 艾尔瓦特集成电路科技（天津）有限公司 | LED driver controller and LED driver |
-
2013
- 2013-07-10 CN CN201310288587.6A patent/CN104284474B/en active Active
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| CN104284474A (en) | 2015-01-14 |
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Address after: 300457, room 2, building 19, No. 701-2 West Ring Road, Tanggu economic and Technological Development Zone, Tianjin, China Applicant after: Dai shuoge integrated circuit (Tianjin) Co. Ltd. Address before: 300457, room 2, building 19, No. 701-2 West Ring Road, Tanggu economic and Technological Development Zone, Tianjin, China Applicant before: Eyre watt integrated circuit technology (Tianjin) Co., Ltd. |
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