CN102469666A - Feedback voltage stabilizing circuit - Google Patents
Feedback voltage stabilizing circuit Download PDFInfo
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- CN102469666A CN102469666A CN2010105658404A CN201010565840A CN102469666A CN 102469666 A CN102469666 A CN 102469666A CN 2010105658404 A CN2010105658404 A CN 2010105658404A CN 201010565840 A CN201010565840 A CN 201010565840A CN 102469666 A CN102469666 A CN 102469666A
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- voltage
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- feedback regulation
- control signal
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Abstract
The invention provides a feedback voltage stabilizing circuit, which is used for providing the stable voltage for a multi-voltage output circuit so as to output multiple output voltages. The feedback voltage stabilizing circuit comprises a voltage control unit which is coupled among the output voltages and used for producing a first voltage according to the output voltages to transmit a voltage control signal. The feedback voltage stabilizing circuit further comprises a reference voltage generator which is coupled with the voltage control unit and used for receiving the voltage control signal to generate a reference voltage and feeding the reference voltage back to the multi-voltage output circuit.
Description
Technical field
Relevant a kind of monitoring (monitor) circuit of the present invention is particularly about a kind of efficient optimization (efficiency optimization) and wrong detection (fault detection) circuit of LED drive system.
Background technology
In view of the plurality of advantages of light-emitting diode (LED), for example volume is little, the reaction time is short, consumed power is low, reliability is high, a large amount of producing feasibility high, so light-emitting diode generally is used in the electronic installation and uses as light source.For example, with the backlight of light-emitting diode, to replace traditional fluorescent lamp as LCD (LCD).
The sketch map of Fig. 1 shows traditional LED drive system, and it mainly comprises multiple optical diode string (LED string) 10, (boost) controller 14 and boost power level (boost power stage) circuit 16 boost.
For traditional LED drive system shown in Figure 1, even each light emitting diode string 10 is used identical voltage source V--
DCAnd the light-emitting diode 100 of similar number, yet, owing to can't mate fully between each light-emitting diode 100, thereby make that the voltage of each input pad (input pad) 11 is inequality.In order to reduce the power consumption of light emitting diode string 10, therefore on circuit design, understand the magnitude of voltage that feed-in boost pressure controller 14 1 is subscribed, for example, 1 volts is as control voltage source V
DCBenchmark, come control voltage source V with the feedback circuit design of boost pressure controller 14 and boost power stage circuit 16 again
DC, make the voltage of input pad 11 can be stable at 1 volt of this scheduled voltage.
Yet above-mentioned design can't reach desired accuracy.Therefore, often can't reach the efficient optimization of LED drive system.In addition, traditional LED drive system lacks the inefficacy (fault) of a mechanism with monitoring light emitting diode string 10, for example the inefficacy short circuit or the open circuit of light-emitting diode 100.Therefore, when 100 inefficacies of more serious light-emitting diode took place, the boost pressure controller 14 of traditional LED drive system and boost power stage circuit 16 can't reach the efficient optimization of light-emitting diode 100 especially.
Therefore, need the efficient optimization and the error detection mechanism that propose a kind of novelty badly, monitoring LED drive system effectively, and promote its luminous efficiency.
Summary of the invention
In view of above-mentioned, the embodiment of the invention discloses a kind of feedback regulation circuit, applicable to LED drive system, except the power consumption that can reduce LED drive system, can also monitor it and lose efficacy unusual.
According to the embodiment of the invention, the feedback regulation circuit provides voltage stabilizing in a multivoltage output circuit, and it exports a plurality of output voltages.The feedback regulation circuit comprises voltage control unit and reference voltage generator.Wherein, voltage control unit is coupled to these output voltages, produces one first voltage and exports a voltage control signal according to this according to these output voltages.Reference voltage generator is coupled to voltage control unit, receives voltage control signal and use to produce a reference voltage, is used to feed back to the multivoltage output circuit.
Description of drawings
The sketch map of Fig. 1 shows traditional LED drive system.
The sketch map of Fig. 2 shows the feedback regulation circuit of the embodiment of the invention.
Fig. 3 has shown the thin portion circuit diagram of module to the digital voltage transducer (ADC) of Fig. 2.
Fig. 4 has shown the thin portion circuit diagram of the low pass filter of the embodiment of the invention.
Fig. 5 has shown the boost pressure controller of the embodiment of the invention and the thin portion circuit diagram of boost power stage circuit.
The main element symbol description
10 light emitting diode string
100 light-emitting diodes
11 input pads
14 boost pressure controllers
16 boost power stage circuit
2 modular circuits
20 multivoltage output circuits
21 modules to digital voltage transducer (ADC)
210 multiplexers
212 modules to digital voltage conversion (ADC) unit
22 voltage control units
220 logical blocks
23 reference voltage generators
232 signal generators
234 low pass filters (LPF)
24 boost pressure controllers
26 boost power stage circuit
V
DCVoltage source
I
SCurrent source
The R1/R2 divider resistance
R
LPFResistance
C
LPFElectric capacity
The L inductance
C electric capacity
The SW switching transistor
Embodiment
The sketch map of Fig. 2 shows the feedback regulation circuit of the embodiment of the invention, and it can provide voltage stabilizing in multivoltage output circuit 20, its exportable a plurality of output voltages.In the present embodiment, multivoltage output circuit 20 comprises multiple optical diode string (LED string) 10, and its brightness is controlled by multiple current source I respectively
SEach light emitting diode string 10 comprises a light-emitting diode 100 more than the series connection, and the anode of light emitting diode string 10 outermost end light-emitting diodes 100 is connected to voltage source V
DC, the negative electrode of light emitting diode string 10 outermost end light-emitting diodes 100 then is connected to the input pad (pad) 11 of modular circuit 2.Multivoltage output circuit 20 is applicable to LED drive system, backlight liquid crystal display module for example, but not as limit.
In the present embodiment, the feedback regulation circuit mainly comprises voltage control unit 22 and reference voltage generator 23.Wherein, voltage control unit 22 is coupled to these output voltages, according to these output voltages to produce first voltage and output voltage control signal according to this.In addition, reference voltage generator 23 is coupled to voltage control unit 22, receives voltage control signal and uses the generation reference voltage, is used to feed back to multivoltage output circuit 20.But above-mentioned voltage control unit 22 general integration and makings are in modular circuit 2, and reference voltage generator 23 then is made in outside the modular circuit 2.Yet whether the above-mentioned square of respectively forming is made in the same modular circuit, is decided by various application scenarios.
In addition, the feedback regulation circuit of present embodiment also can comprise module to digital voltage transducer (ADC) 21, and being connected in multivoltage output circuit 20 and changing these (module) output voltages is multiple digital voltage.These multivoltages are fed to voltage control unit 22, its select these digital voltages one of them as the first above-mentioned voltage.Fig. 3 shows the thin portion circuit diagram of module to the digital voltage transducer (ADC) 21 of the embodiment of the invention.In the present embodiment, module to digital voltage transducer (ADC) 21 comprises multiplexer 210 and module to digital voltage conversion (ADC) unit 212.Wherein, multiplexer 210 receives the output voltage of many input pads 11, and one of them is to be fed to ADC unit 212 in each selection of time (or sampling).212 of ADC unit convert multiplexer 210 selected output voltages into digital voltage.
In the present embodiment, voltage control unit 22 comprises logical block 220.Wherein, logical block 220 according to a preset rules select these digital voltages one of them as the first above-mentioned voltage, and export a corresponding voltage control signal.In various embodiment,, possibly adopt the different preset rule according to different demands.For example, in the present embodiment, for promoting the efficient of multivoltage output circuit 20, circuit can be designed to get minimum output voltage so that multivoltage output circuit institute consumed power minimizes.Therefore, the minimum voltage of logical block 220 these digital voltages of selection is as first voltage.The enforcement of logical block 220 generally can be used hardware technology, software engineering or its combination.
Reference voltage generator 23 is connected in logical block 220.Reference voltage generator 23 comprises signal generator 232, and it produces a waveform according to the voltage control signal that first voltage is produced.In the present embodiment, signal generator 232 is the pulse width modulating signal generator, and it produces different pulse durations according to voltage control signal.In one embodiment, logical block 220 is compared first voltage with a target voltage, and the difference with both produces voltage control signal so that signal generator 232 adjustment pulse durations again.Know clearly it, signal generator 232 can be according to the ratio equal proportion adjustment pulse duration of this difference and target voltage.When reponse system reached stable state, target voltage can be adjusted to and approach first voltage.And one embodiment of the invention is by the value of voltage control unit 22 adjustment first voltage, and and then produce a reference voltage by reference voltage generator 23, let target voltage follow the change of first voltage and adjust.Let the voltage source that multiple output circuit connected also and then adjust by this to reach systemic presupposition or ideal value.
The reference voltage generator 23 of present embodiment also comprises a low pass filter (LPF) 234, supplies to be used for capturing from the modulation waveform that signal generator 232 is exported the part of direct voltage, with voltage as a reference.Fig. 4 shows the thin portion circuit diagram of the low pass filter (LPF) 234 of the embodiment of the invention, and it mainly comprises resistance R
LPFAnd capacitor C
LPFWherein, resistance R
LPFBe connected in the output of signal generator 232, and capacitor C
LPFThen be connected in resistance R
LPFAnd between the ground.
Reference voltage generator 23 is controlled by voltage control signal; Adjustment by the work period; Make the reference voltage of output also with the works adjustment, and then make the voltage source regulated of multivoltage output circuit, thereby let the minimum voltage in the middle of the multi-output voltages can be stable at target voltage.
The feedback regulation circuit of one embodiment of the invention also can comprise boost pressure controller 24 and boost power stage circuit 26.Fig. 5 shows the boost pressure controller 24 of the embodiment of the invention and the thin portion circuit diagram of boost power stage circuit 26.Boost pressure controller 24 supplies relatively from the reference voltage of reference voltage generator 23 outputs and the adjustable-voltage source V of multivoltage output circuit
DCThe voltage of a dividing point, and export a feedback control signal to boost power stage circuit 26 according to this.Boost power stage circuit 26 makes voltage source V according to feedback control signal
DCThe voltage approaches of dividing point in reference voltage, and then adjust this adjustable-voltage source V
DCMagnitude of voltage.The boost power stage circuit 26 of present embodiment supplies device (switching power supply) for comprising switched-mode power supply, and it mainly comprises N type metal-oxide semiconductor (NMOS) switching transistor SW, and the accumulator of being made up of inductance L and/or capacitor C.NMOS switching transistor SW is controlled by voltage control signal to carry out the switching of power supply.
Except the purpose that can reach feedback regulation, present embodiment also can be in order to carry out wrong detection.For example, when the inefficacy short circuit took place one or more light-emitting diode 100 of a certain light emitting diode string 10, unusual rising promptly can take place in a certain voltage of the output voltage of its corresponding input pad 11.Logical block 220 can detect the short circuit of a certain light emitting diode string 10 by monitoring 10 corresponding input pad 11 voltages of each light emitting diode string.In another example; When open circuit takes place to lose efficacy in one or more light-emitting diode 100 of a certain light emitting diode string 10; Unusual reduction promptly can take place in the voltage of its corresponding input pad 11, and logical block 220 can detect the inefficacy open circuit of light emitting diode string 10 by keeping watch on 10 corresponding input pad 11 voltages of light emitting diode string.Detected inefficacy short circuit or open circuit can further offer other unit of system and do further to dispose.
The above is merely preferred embodiment of the present invention, is not in order to limit claim of the present invention; All other do not break away from the equivalence of being accomplished under the spirit that invention discloses and changes or modify, and all should be included in the scope thereof.
Claims (12)
1. a feedback regulation circuit provides voltage stabilizing in a multivoltage output circuit, and this multivoltage output circuit is exported a plurality of output voltages, and this feedback regulation circuit comprises:
One voltage control unit is coupled to these output voltages, produces one first voltage and exports a voltage control signal according to this according to these output voltages; And
One reference voltage generator is coupled to this voltage control unit, receives this voltage control signal and use to produce a reference voltage, is used to feed back to this multivoltage output circuit.
2. feedback regulation circuit as claimed in claim 1 is characterized in that, also comprises:
One module to digital voltage transducer, being connected in this multivoltage output circuit and changing these output voltages is a plurality of digital voltages; Wherein this voltage control unit selects these digital voltage one of which as this first voltage.
3. like claim 1 or the 2nd described feedback regulation circuit, it is characterized in that this voltage control unit comprises:
One logical block is selected these digital voltage one of which according to a preset rules and is produced this voltage control signal as this first voltage and according to this first voltage.
4. feedback regulation circuit as claimed in claim 3; It is characterized in that; This reference voltage generator comprises a signal generator; Receive this voltage control signal and produce a corresponding output signal, wherein this signal generator is a pulse width modulating signal generator, according to a pulse duration of this this output signal of voltage control signal adjustment.
5. feedback regulation circuit as claimed in claim 4 is characterized in that, this logical block is compared this first voltage and produced this voltage control signal with a target voltage, and this signal generator is adjusted this pulse duration according to this.
6. feedback regulation circuit as claimed in claim 5 is characterized in that, this logical block produces this voltage control signal according to a difference of this first voltage and this target voltage, supplies this this pulse duration of signal generator adjustment.
7. feedback regulation circuit as claimed in claim 6 is characterized in that, the minimum voltage in these these digital voltages of logical block selection is as this first voltage.
8. feedback regulation circuit as claimed in claim 6 is characterized in that, this logical block produces this voltage control signal according to the ratio equal proportion of this difference and this target voltage, and this signal generator is adjusted this pulse duration according to this.
9. feedback regulation circuit as claimed in claim 4 is characterized in that, above-mentioned reference voltage generator also comprises:
One low pass filter, the part that should export signal acquisition one direct current voltage certainly is as this reference voltage.
10. feedback regulation circuit as claimed in claim 3 is characterized in that, above-mentioned these output voltages of logical block monitoring are to detect the state of this multivoltage output circuit.
11. feedback regulation circuit as claimed in claim 2 is characterized in that, above-mentioned module to digital voltage transducer comprises:
One multiplexer, it receives those output voltages, and in each selection of time one of them; And
One module to digital voltage converting unit converts the output voltage of this selection into corresponding this digital voltage.
12. feedback regulation circuit as claimed in claim 1 is characterized in that, also comprises:
One boost pressure controller, the dividing potential drop in an adjustable-voltage source of this reference voltage and this multivoltage output circuit relatively, and produce a feedback control signal; And
One boost power stage circuit receives voltage approaches that this feedback control signal makes this dividing point in this reference voltage, so that corresponding this adjustable-voltage source to be provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010565840.4A CN102469666B (en) | 2010-11-17 | 2010-11-17 | Feedback voltage stabilizing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010565840.4A CN102469666B (en) | 2010-11-17 | 2010-11-17 | Feedback voltage stabilizing circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102469666A true CN102469666A (en) | 2012-05-23 |
| CN102469666B CN102469666B (en) | 2014-01-29 |
Family
ID=46072633
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010565840.4A Expired - Fee Related CN102469666B (en) | 2010-11-17 | 2010-11-17 | Feedback voltage stabilizing circuit |
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| Country | Link |
|---|---|
| CN (1) | CN102469666B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103488226A (en) * | 2013-09-09 | 2014-01-01 | 天脉聚源(北京)传媒科技有限公司 | Output voltage control circuit |
| US9348351B2 (en) | 2012-11-19 | 2016-05-24 | Industrial Technology Research Institute | Switch circuit |
| CN109156073A (en) * | 2016-03-25 | 2019-01-04 | 株式会社艾泰克系统 | The short-circuit method for detecting abnormality of the short-circuit abnormal detector of LED illumination System, the LED light device with the device and LED illumination System |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080001547A1 (en) * | 2005-09-20 | 2008-01-03 | Negru Sorin L | Driving parallel strings of series connected LEDs |
| CN101527989A (en) * | 2008-03-04 | 2009-09-09 | 原景科技股份有限公司 | Circuit and method for driving light emitting diodes |
| CN101583216A (en) * | 2008-05-16 | 2009-11-18 | 原景科技股份有限公司 | Driving circuit and driving method of light emitting diode (LED) |
-
2010
- 2010-11-17 CN CN201010565840.4A patent/CN102469666B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080001547A1 (en) * | 2005-09-20 | 2008-01-03 | Negru Sorin L | Driving parallel strings of series connected LEDs |
| CN101527989A (en) * | 2008-03-04 | 2009-09-09 | 原景科技股份有限公司 | Circuit and method for driving light emitting diodes |
| CN101583216A (en) * | 2008-05-16 | 2009-11-18 | 原景科技股份有限公司 | Driving circuit and driving method of light emitting diode (LED) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9348351B2 (en) | 2012-11-19 | 2016-05-24 | Industrial Technology Research Institute | Switch circuit |
| CN103488226A (en) * | 2013-09-09 | 2014-01-01 | 天脉聚源(北京)传媒科技有限公司 | Output voltage control circuit |
| CN109156073A (en) * | 2016-03-25 | 2019-01-04 | 株式会社艾泰克系统 | The short-circuit method for detecting abnormality of the short-circuit abnormal detector of LED illumination System, the LED light device with the device and LED illumination System |
| CN109156073B (en) * | 2016-03-25 | 2020-07-24 | 株式会社艾泰克系统 | L ED lighting system short circuit abnormity detection device and method, L ED lighting device |
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| Publication number | Publication date |
|---|---|
| CN102469666B (en) | 2014-01-29 |
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