CN102612218A - Drive controller chip for a plurality of strings of light-emitting diodes - Google Patents
Drive controller chip for a plurality of strings of light-emitting diodes Download PDFInfo
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- CN102612218A CN102612218A CN2012100468116A CN201210046811A CN102612218A CN 102612218 A CN102612218 A CN 102612218A CN 2012100468116 A CN2012100468116 A CN 2012100468116A CN 201210046811 A CN201210046811 A CN 201210046811A CN 102612218 A CN102612218 A CN 102612218A
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Abstract
The invention discloses a drive controller chip for a plurality of strings of light-emitting diodes, wherein a current reference, a group of current mirrors, two voltage comparators and a switching power supply constant-voltage source are provided in a driver circuit. The drive controller chip for a plurality of strings of light-emitting diodes provides a drive control circuit capable of equalizing the currents of a plurality of strings of light-emitting diodes at high efficiency; the current mirrors and one current reference are employed to ensure that the current of each string of light-emitting diodes is basically equal to a reference current; two comparators are utilized to select the maximal single string current and the minimal saturation voltage drop of the current mirrors, respectively; and the system is controlled to operate in a high efficiency state through negative feedback control to the maximal single string current and the minimal saturation voltage drop.
Description
Technical field:
The present invention relates to the drive unit of light-emitting diode (LED), is a kind of IC chip, specifically, is a kind of driving governor chip that can balanced multi-string LED electric current.
Background technology:
Light-emitting diode has long, characteristics such as luminous efficiency is high, noiseless and cost performance height of life-span, has been widely used on the various electronic electric equipments such as electronic computer, mobile phone, street lamp in recent years.Usually single light-emitting diode can't provide enough luminous intensities, the luminescent device group that must use many light emitting diode parallel connections or be composed in series.In general, the voltage difference excursion of diode is very little, so the luminous power of diode depends primarily on its current value.The electric current that the luminescent device group that composes in parallel with respect to many light-emitting diodes, series connection luminescent device group can guarantee to pass through every diode is equal, this make light-emitting diode and between brightness even relatively.Because line voltage or cell voltage have limited to the number of diodes that a string diode can hold; For a lot of large scale systems; Single string diode group still can't provide enough luminous powers, and this luminescent device that makes many string (many of every strings) light-emitting diodes form consists of necessity.The drive circuit of many strings light-emitting diode of design of High Efficiency rate makes that luminosity is even between string and string, is a great challenge in this field.
Summary of the invention:
The Drive and Control Circuit that the purpose of this invention is to provide the many strings of a kind of equilibrium expeditiously led current; Adopting current mirror and current reference to guarantee respectively to go here and there the electric current of light-emitting diode all equates with reference current basically; Use two comparators to select VCE minimum in maximum single crosstalk stream and the current mirror respectively, make system works under the high efficiency state through negative feedback control to the two.
Technical solution of the present invention is:
The switch power supply system of led current is gone here and there in an equilibrium more, it is characterized in that: a current reference is arranged, one group of current mirror, two voltage comparators and a Switching Power Supply constant pressure source in drive circuit.
Current reference can be to utilize an emitter bias (VBE) and the steady resistance that temperature coefficient is little, produces a reference current that reduces with the temperature increase; Current reference also can be poor (Δ VBE) and the steady resistance that temperature coefficient is little of emitter bias that utilizes the double pole triode of two different sizes, produces a reference current that increases with temperature; Current reference can also be to utilize an operational amplifier, and bandgap voltage reference and the steady resistance that temperature coefficient is little produce a temperature-independent basically reference current.
One group of current mirror can be the double pole triode of several continuous grounded emitters of base stage, and one of them base stage links to each other with collector electrode, and the collector electrode of all the other several triodes is as output.Form the pressure drop of can connecting between emitter and the ground of each double pole triode of current mirror to descend in working order greater than 10 millivolts inspection leakage resistance.
As input, relatively size is selected minimum collector voltage to first voltage comparator with the collector voltage of several triodes in the current mirror.The controller of Switching Power Supply constant pressure source compares this minimum pickup pole tension and preset saturation voltage drop; Utilize error voltage control inspection stream voltage between the two; To reconcile the output voltage of Switching Power Supply, make that the minimum pickup pole tension of current mirror output equals predefined saturation voltage drop in normal operation through system's negative feedback.
As input, relatively size is selected maximum inspection leakage resistance pressure drop with the emitter voltage of several triodes in the current mirror for second voltage comparator.The controller of Switching Power Supply constant pressure source should maximum the pressure drop of inspection leakage resistance compare with inspection stream voltage, utilize the duty ratio of error voltage control switching between the two, through negative feedback to reconcile the output current of Switching Power Supply.
Contrast patent documentation: CN1779749 LED driving circuit 200410091179.2, CN1866709 LED driving circuit 200610092736.1
Description of drawings:
Accompanying drawing 1 is the systematic schematic diagram of drive controlling of the present invention.
Accompanying drawing 2 for the current mirror in the Drive and Control Circuit a kind of sketch map that adopts the embodiment of double pole triode.
Accompanying drawing 3 is a kind of sketch map that adopts the embodiment of fet of the current mirror in the Drive and Control Circuit.Because the VCE voltage of double pole triode that is in the saturation region is usually much larger than the VDS voltage of the general application fet that is in linear zone down,, adopt the fet realization current mirror overall system efficiency usually can be higher if chip technology allows.
Accompanying drawing 4 be in the Drive and Control Circuit current reference a kind of sketch map of embodiment.This execution mode utilizes poor (Δ VBE) and steady resistance that temperature coefficient is little of emitter bias of the double pole triode of two different sizes, produces a reference current that increases with temperature.Its advantage is simple in structure.
Accompanying drawing 5 be in the Drive and Control Circuit current reference the sketch map of another kind of embodiment.This execution mode utilizes an operational amplifier, and bandgap voltage reference and the steady resistance that temperature coefficient is little produce a temperature-independent basically reference current.Its advantage is stability, and system's power output can not produce significantly with the variation of ambient temperature and change.
Embodiment:
Embodiment 1:
The employing operational amplifier is arranged, the temperature-independent basically reference current that steady resistance produced that bandgap voltage reference and temperature coefficient are little in drive circuit.The double pole triode of several grounded emitters that base stage links to each other, one of them base stage links to each other with collector electrode, and the collector electrode of all the other several triodes constitutes one group of current mirror as output.Forming all connects one between emitter and the ground of each double pole triode of current mirror examines leakage resistance, in order to detect the peak current of every string light-emitting diode.The use of current mirror has guaranteed respectively to go here and there the electric current of light-emitting diode and has all equated with reference current basically.
First voltage comparator in the drive circuit as input, is selected minimum collector voltage with the collector voltage of several triodes in the current mirror.The controller of Switching Power Supply constant pressure source compares this minimum pickup pole tension and predefined saturation voltage drop; Utilize an inspection stream of error voltage control voltage between the two; To reconcile the output voltage of Switching Power Supply, make that the minimum pickup pole tension of current mirror output equals predefined saturation voltage drop in normal operation through system's negative feedback.
Second voltage comparator in the drive circuit as input, selected maximum inspection leakage resistance pressure drop with the emitter voltage of several triodes in the current mirror.The controller of Switching Power Supply constant pressure source should maximum inspection leakage resistance pressure drop compare with above-mentioned inspection stream voltage, utilize the duty ratio of error voltage control switching between the two, through the output current of negative feedback with the conciliation Switching Power Supply.
Embodiment 2:
Several fets that current mirror in the Drive and Control Circuit adopts grid to link to each other are realized.All the other are with embodiment 1.Because the VCE voltage of double pole triode that is in the saturation region adopts the entire system efficient of fet realization current mirror higher usually usually much larger than the VDS voltage of the general application fet that is in linear zone down.
Claims (9)
1. the light-emitting diode of string more than kind driving governor chip is characterized in that: a current reference is arranged, one group of current mirror, two voltage comparators and a Switching Power Supply constant pressure source in drive circuit.
2. many string light-emitting diode driving governor chips according to claim 1; It is characterized in that: current reference can be to utilize an emitter bias (VBE) and the steady resistance that temperature coefficient is little, produces a reference current that reduces with the temperature increase; Current reference also can be poor (Δ VBE) and the steady resistance that temperature coefficient is little of emitter bias that utilizes the double pole triode of two different sizes, produces a reference current that increases with temperature; Current reference can also be to utilize an operational amplifier, and bandgap voltage reference and the steady resistance that temperature coefficient is little produce a temperature-independent basically reference current.
3. many string light-emitting diode driving governor chips according to claim 1; It is characterized in that: one group of current mirror can be the double pole triode of several continuous grounded emitters of base stage; One of them base stage links to each other with collector electrode, and the collector electrode of all the other several triodes is as output.
4. many string light-emitting diode driving governor chips according to claim 3 is characterized in that: form the pressure drop of can connecting between emitter and the ground of each double pole triode of current mirror to descend in working order greater than 10 millivolts inspection leakage resistance.
5. many string light-emitting diode driving governor chips according to claim 1 is characterized in that: as input, relatively size is selected minimum collector voltage to first voltage comparator with the collector voltage of several triodes in the current mirror.
6. many string light-emitting diode driving governor chips according to claim 1; It is characterized in that: the minimum pickup pole tension that the controller of Switching Power Supply constant pressure source is selected voltage comparator compares with preset saturation voltage drop; Utilize error voltage control inspection stream voltage between the two; To reconcile the output voltage of Switching Power Supply, make that the minimum pickup pole tension of current mirror output equals predefined saturation voltage drop in normal operation through system's negative feedback.
7. many string light-emitting diode driving governor chips according to claim 1 is characterized in that: as input, relatively size is selected maximum inspection leakage resistance pressure drop with the emitter voltage of several triodes in the current mirror for second voltage comparator.
8. many string light-emitting diode driving governor chips according to claim 1; It is characterized in that: the maximum inspection leakage resistance pressure drop that the controller of Switching Power Supply constant pressure source is selected voltage comparator compares with inspection stream voltage; Utilize the duty ratio of error voltage control switching between the two, through the output current of negative feedback with the conciliation Switching Power Supply.
9. many string light-emitting diode driving governor chips according to claim 3, it is characterized in that: current mirror also can be several fets that grid links to each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100468116A CN102612218A (en) | 2012-02-28 | 2012-02-28 | Drive controller chip for a plurality of strings of light-emitting diodes |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012100468116A CN102612218A (en) | 2012-02-28 | 2012-02-28 | Drive controller chip for a plurality of strings of light-emitting diodes |
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| CN102612218A true CN102612218A (en) | 2012-07-25 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103260285A (en) * | 2012-11-20 | 2013-08-21 | 美芯晟科技（北京）有限公司 | Method and circuit for dissipating system heat |
| CN103687186A (en) * | 2012-09-07 | 2014-03-26 | 英飞凌科技奥地利有限公司 | Circuit and method for driving LEDs |
| WO2014075383A1 (en) * | 2012-11-15 | 2014-05-22 | 欧普照明股份有限公司 | Multiplex led driver circuit |
| CN104661381A (en) * | 2013-11-25 | 2015-05-27 | 上海航空电器有限公司 | Light emitting block constant current driving circuit |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1707942A (en) * | 2004-06-09 | 2005-12-14 | 恩益禧电子股份有限公司 | Voltage comparator circuit |
| CN1805638A (en) * | 2004-11-29 | 2006-07-19 | 美国凹凸微系有限公司 | Circuit and method of driving diode |
| CN101089772A (en) * | 2006-06-16 | 2007-12-19 | 罗姆股份有限公司 | Voltage generator and power supply circuit |
| CN101572984A (en) * | 2009-06-04 | 2009-11-04 | 吉林大学 | Image ratio constant flow source circuit driving multipath light emitting diode |
| CN101893910A (en) * | 2010-07-28 | 2010-11-24 | 苏州日月成科技有限公司 | Self-adaptive current mirror |
| CN101964346A (en) * | 2009-07-24 | 2011-02-02 | 中芯国际集成电路制造(上海)有限公司 | Bipolar transistor, forming method of bipolar transistor and band-gap reference circuit |
| CN202503706U (en) * | 2012-02-28 | 2012-10-24 | 李志鹏 | Drive controller chip of strings of light emitting diodes |
-
2012
- 2012-02-28 CN CN2012100468116A patent/CN102612218A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1707942A (en) * | 2004-06-09 | 2005-12-14 | 恩益禧电子股份有限公司 | Voltage comparator circuit |
| CN1805638A (en) * | 2004-11-29 | 2006-07-19 | 美国凹凸微系有限公司 | Circuit and method of driving diode |
| CN101089772A (en) * | 2006-06-16 | 2007-12-19 | 罗姆股份有限公司 | Voltage generator and power supply circuit |
| CN101572984A (en) * | 2009-06-04 | 2009-11-04 | 吉林大学 | Image ratio constant flow source circuit driving multipath light emitting diode |
| CN101964346A (en) * | 2009-07-24 | 2011-02-02 | 中芯国际集成电路制造(上海)有限公司 | Bipolar transistor, forming method of bipolar transistor and band-gap reference circuit |
| CN101893910A (en) * | 2010-07-28 | 2010-11-24 | 苏州日月成科技有限公司 | Self-adaptive current mirror |
| CN202503706U (en) * | 2012-02-28 | 2012-10-24 | 李志鹏 | Drive controller chip of strings of light emitting diodes |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103687186A (en) * | 2012-09-07 | 2014-03-26 | 英飞凌科技奥地利有限公司 | Circuit and method for driving LEDs |
| CN103687186B (en) * | 2012-09-07 | 2016-02-03 | 英飞凌科技奥地利有限公司 | For circuit and the method for driving LED |
| WO2014075383A1 (en) * | 2012-11-15 | 2014-05-22 | 欧普照明股份有限公司 | Multiplex led driver circuit |
| CN103260285A (en) * | 2012-11-20 | 2013-08-21 | 美芯晟科技（北京）有限公司 | Method and circuit for dissipating system heat |
| CN104661381A (en) * | 2013-11-25 | 2015-05-27 | 上海航空电器有限公司 | Light emitting block constant current driving circuit |
| CN104661381B (en) * | 2013-11-25 | 2019-01-11 | 上海航空电器有限公司 | A kind of light-emitting block constant-current drive circuit |
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Application publication date: 20120725 |