CN102291880B - A kind of LED drive chip of low-voltage - Google Patents
A kind of LED drive chip of low-voltage Download PDFInfo
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- CN102291880B CN102291880B CN201110138954.5A CN201110138954A CN102291880B CN 102291880 B CN102291880 B CN 102291880B CN 201110138954 A CN201110138954 A CN 201110138954A CN 102291880 B CN102291880 B CN 102291880B
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Abstract
The invention discloses a kind of LED drive chip of low-voltage, comprise the resolution for input video control signal and external LED display screen, detect the input voltage measurement module of described video control signal; According to the resolution of preset voltage value, described input voltage and described LED display, generate the voltage change generation module comprising the LED display voltage change table of voltage change; According to described LED display voltage change table, the voltage regulator module of the described video control signal after adjustment voltage is set; And according to the described video control signal after adjustment voltage, boosted output voltages, drives the boosting driver module of each LED of described LED display.The present invention has when low-voltage inputs, and still can guarantee that each LED normally works under minimum ignition voltage.
Description
Technical field
The present invention relates to the Driving technique of lighting device, particularly relate to a kind of LED drive chip of low-voltage.
Background technology
In the stage now, pursue healthy in the whole world, environmental protection pressure, in the great situation of energy crisis, semiconductor lighting by universally acknowledged be a kind of important channel of health energy-saving environment protective, expand its range of application just at faster speed.
In prior art, the LED drive chip being applied to LED display and LED decorations generally only has driving function, can be used for constant current or constant voltage drives each LED, usually, each LED drive chip needs to reach under predetermined voltage could each LED of driven, each LED is normally started at predetermined driving voltage, and normally show work, as when driving voltage is lower, owing to not reaching the driving voltage of each LED, or, in each LED of series connection, be in series connection LED below, the driving voltage of each LED is not reached because circuit exists loss, then easily make each LED cisco unity malfunction, or, can not light, affect display or the illumination functions of each LED.
Therefore, prior art existing defects, needs to improve.
Summary of the invention
Technical problem to be solved by this invention is, provides one to have when low-voltage inputs, and still can guarantee the LED drive chip of each LED low-voltage of normal work under minimum ignition voltage.
Technical scheme of the present invention is as follows: a kind of LED drive chip of low-voltage, wherein, comprises input voltage measurement module, voltage change generation module, voltage regulator module and boosting driver module; Described input voltage measurement module installation input port, for the resolution of input video control signal and external LED display screen, detects the input voltage of described video control signal, and testing result is sent to described voltage change generation module; Described voltage change generation module, according to the resolution of preset voltage value, described input voltage and described LED display, generates the LED display voltage change table comprising voltage change, and is sent to described voltage regulator module; Described voltage regulator module, according to described LED display voltage change table, arranges the described video control signal after adjustment voltage, and sends it to described boosting driver module; Described boosting driver module is according to the described video control signal after adjustment voltage, and boosted output voltages, drives each LED of described LED display.
Application technique scheme, in described LED drive chip, described boosting drive module setting three-terminal switch type boost-voltage regulator.
Apply each technical scheme above-mentioned, in described LED drive chip, the interior also voltage stabilizing circuit in parallel of described three-terminal switch type boost-voltage regulator, it comprises the lc circuit of series connection and some voltage stabilizing didoes of series connection, as described voltage stabilizing circuit after both parallel connections.
Apply each technical scheme above-mentioned, in described LED drive chip, described boosting drive module setting DC chopper circuit converter.
Apply each technical scheme above-mentioned, in described LED drive chip, also comprise a display voltage detection module be connected with described voltage change generation module, for detecting the quantity of each LED be connected with described LED drive chip, calculate its standard display voltage, and show voltage according to the standard of each LED, generate described preset voltage value.
Apply each technical scheme above-mentioned, in described LED drive chip, also arrange a distribution module be connected with described detection module, described detection module is also for calculating the connected mode of each LED, described distribution module, according to described connected mode, distributes described video control signal.
Apply each technical scheme above-mentioned, in described LED drive chip, also comprise a warning module, be connected with described voltage change generation module, for when described voltage change is non-vanishing, generates early warning signal, and export.
Apply each technical scheme above-mentioned, in described LED drive chip, described voltage change generation module arranges contrast submodule, for contrasting described preset voltage value and described input voltage, according to both differences, generates described voltage change.
Apply each technical scheme above-mentioned, in described LED drive chip, described voltage regulator module also arranges a syndrome module and a sub module stored, and described syndrome module is used for input validation code, verifies described video control signal; Described sub module stored is connected with described syndrome module, for storing described check code.
Apply each technical scheme above-mentioned, in described LED drive chip, described LED drive chip is constant-current LED driving chip or constant-voltage LED driving chip.
Adopt such scheme, the present invention is by arranging input voltage measurement module, voltage change generation module, voltage regulator module and boosting driver module in LED drive chip; The input voltage of described video control signal is detected by described input voltage measurement module; And the LED display voltage change table comprising voltage change is generated by described voltage change generation module; Passing through described voltage regulator module according to described LED display voltage change table, the described video control signal after adjustment voltage is being set, and sends it to described boosting driver module boosted output voltages, drive each LED of described LED display; Described LED drive chip when low-voltage inputs, by detecting its input voltage, and by adjustment, can be made its output voltage be not less than the minimum ignition voltage of connected each LED, guarantees that each LED normally works under minimum ignition voltage.
Accompanying drawing explanation
Fig. 1 is a kind of connection diagram of the specific embodiment of the invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
As shown in Figure 1, present embodiments provide a kind of LED drive chip of low-voltage, when described LED drive chip can be low-voltage input at the video control signal inputted, timely detection also adjusts voltage according to testing result, the output voltage of described video control signal is made to be not less than the minimum ignition voltage of connected each LED, guarantee that each LED at least normally can work under minimum ignition voltage, thus greatly reduce the operating power consumption under low-light level state.
Described LED drive chip arranges interconnective input voltage measurement module, voltage change generation module, voltage regulator module and boosting driver module, further, described input voltage measurement module, described voltage change generation module, described voltage regulator module and described boosting driver module integratedly can be arranged on the inside of described LED drive chip.
Wherein, described input voltage measurement module installation input port, as, described LED drive chip can arrange a pin as described input port, described input port is by circuit and other outside modules, or the input of outside is connected, described input port is used for input video control signal, and the resolution of external LED display screen, and, described input power detection module detects the input voltage of described video control signal, testing result is sent to described voltage change generation module, and, the resolution of the described LED display of input is also sent to described voltage change generation module by described input voltage measurement module.
Described voltage change generation module is according to preset voltage value, the resolution of described input voltage and described LED display, generate the LED display voltage change table comprising voltage change, wherein, the resolution one_to_one corresponding of described preset voltage value and outside described LED display, for the standard display magnitude of voltage of each LED of the described LED display in outside, and, described voltage change table also with the resolution one_to_one corresponding of the described LED display of outside, each LED of described LED display is adjusted for one_to_one corresponding, described preset voltage value can be arranged by outside input, and be stored in the inside of described voltage change generation module, or, automatically setting can also be completed according to the resolution of described LED display, described for generation voltage change table is sent to described voltage regulator module by described voltage change generation module.
Described voltage regulator module is according to the voltage change table of described LED display, described video control signal after adjustment voltage is set, thus make the Voltage Cortrol of described video control signal to its normal voltage, use described video control signal when each LED of drived control, each LED can at least normally work under its minimum ignition voltage, show the video image that described video control signal comprises, further, the described video control signal after adjustment is also sent to described boosting driver module by described voltage regulator module.
Described boosting driver module is according to the described video control signal after adjustment voltage, raise the output voltage of described video control signal, namely the driving voltage that described LED drive chip exports is raised, the higher output voltage of relative input voltage is adopted to drive each LED of described LED display, each LED normally can be worked under default driving voltage, and show its video image comprised according to described video control signal, there is good display effect.
Be applied to above-mentioned each example, in described LED drive chip, described boosting drive module setting pulse transformer, inductive transformer, three-terminal switch type boosting (Boost) pressurizer or DC chopper circuit (Buck-Boost) converter, as, described boosting driver module can arrange three-terminal switch type boost-voltage regulator, by arranging three-terminal switch type pressurizer, described boosting driver module can be worked at lower voltages, described video control signal is driven each LED with the form of high drive.
Or, the interior also voltage stabilizing circuit in parallel of described three-terminal switch type boost-voltage regulator, described voltage stabilizing circuit comprises the lc circuit of series connection and some voltage stabilizing didoes of series connection, described three-terminal switch type boost-voltage regulator with after each lc circuit of connecting and some voltage stabilizing didoe parallel connections of connecting as described voltage stabilizing circuit, thus make described boosting driver module when driving each LED, there is relatively more stable driving voltage.
Or described boosting driver module also can arrange DC chopper circuit converter, the effect that boosting drives each LED equally also can be reached.
Or, be applied to above-mentioned each example, described LED drive chip also comprises a display voltage detection module be connected with described voltage change generation module, described display voltage detection module can be arranged with other module integrations, described display voltage detection module is directly connected with each LED of the described LED display in outside, for detecting the quantity of each LED be connected with described LED drive chip, calculate its standard display voltage, and show voltage according to the standard of each LED, generate described preset voltage value, as, can according to the display voltage of each LED detected, and the resolution of described LED display, calculate the standard display voltage of each LED, and according to described standard display voltage, generate the described preset voltage value of each LED.
Or, be applied to above-mentioned each example, described LED drive chip also arranges a distribution module be connected with described detection module, described distribution module can be arranged with other module integrations, and, described detection module is also for calculating the connected mode of each LED, namely be in parallel connection or series connection between each LED, described distribution module is according to the described connected mode of each LED, distribute described video control signal, described video control signal, can be sent in corresponding each LED, drive the correct display video image of each LED.
Or, be applied to above-mentioned each example, described LED drive chip also comprises a warning module, described warning module is connected with described voltage change generation module, when described voltage change is non-vanishing, namely the described voltage change that generates of described voltage change generation module on the occasion of or negative value time, then described warning module generates early warning signal, and export described early warning signal, wherein, described early warning signal can receive by arranging indicating member, and send instruction early warning, or, also can be received by hummer, send song early warning, or, display unit can also be passed through, show described early warning signal, thus reach the effect of early warning, thus make when the input voltage of described LED drive chip does not meet its output voltage, remind operator.
Or, described voltage change generation module arranges contrast submodule, described contrast submodule may be used for contrasting described preset voltage value and described input voltage, according to both differences, generate described voltage change, thus the input voltage of described video control signal is adjusted by described voltage change, make its input voltage be adjusted to described preset voltage value, and export described boosting driver module to.
Or, be applied to above-mentioned each example, described voltage regulator module also arranges a syndrome module and a sub module stored, described syndrome module can pass through outside input validation code, and verify described video control signal according to described check code, wherein, described video control signal can be verified by described check code and whether store data distortion or whether there is loss of data etc., further, can also repair described video control signal according to described check code; Described memory module can be connected with described syndrome module, after outside inputs described check code, and described check code is stored in described sub module stored.
Or, be applied to above-mentioned each example, described LED drive chip is constant-current LED driving chip or constant-voltage LED driving chip, drives coupled each LED under may be used for voltage under constant electric current or constant, each LED is shown relatively stable, display effect is good.
It should be noted that, the mutual combination of above-mentioned each technical characteristic, forms each embodiment, should be considered as the scope that specification of the present invention is recorded.
Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection range that all should belong to claims of the present invention.
Claims (5)
1. a LED drive chip for low-voltage, is characterized in that, comprises input voltage measurement module, voltage change generation module, voltage regulator module, a distribution module be connected with described detection module, a warning module and the driver module that boosts;
Described input voltage measurement module installation input port, for the resolution of input video control signal and external LED display screen, detect the input voltage of described video control signal, and the resolution of testing result and described LED display is sent to described voltage change generation module;
Described voltage change generation module, according to the resolution of preset voltage value, described input voltage and described LED display, generates the LED display voltage change table comprising voltage change, and is sent to described voltage regulator module;
Described preset voltage value completes setting automatically according to the resolution of described LED display, with the resolution one_to_one corresponding of the described LED display of outside, for the standard display magnitude of voltage of each LED of the described LED display in outside, and, described voltage change table also with the resolution one_to_one corresponding of the described LED display of outside, adjust each LED of described LED display for one_to_one corresponding;
Described voltage regulator module, according to described LED display voltage change table, arranges the described video control signal after adjustment voltage, and sends it to described boosting driver module;
Described boosting driver module is according to the described video control signal after adjustment voltage, and boosted output voltages, drives each LED of described LED display;
Described LED drive chip also comprises a display voltage detection module be connected with described voltage change generation module, for detecting the quantity of each LED be connected with described LED drive chip, calculate its standard display voltage, and show voltage according to the standard of each LED, generate described preset voltage value;
Described detection module is also for calculating the connected mode of each LED, and described distribution module, according to described connected mode, distributes described video control signal;
Described warning module is connected with described voltage change generation module, for when described voltage change is non-vanishing, generates early warning signal, and exports;
Described voltage change generation module arranges contrast submodule, a syndrome module and a sub module stored, for contrasting described preset voltage value and described input voltage, according to both differences, generates described voltage change; Described syndrome module is used for input validation code, verifies described video control signal; Described sub module stored is connected with described syndrome module, for storing described check code.
2. LED drive chip according to claim 1, is characterized in that, described boosting drive module setting three-terminal switch type boost-voltage regulator.
3. LED drive chip according to claim 2, is characterized in that, the interior also voltage stabilizing circuit in parallel of described three-terminal switch type boost-voltage regulator, it comprises the lc circuit of series connection and some voltage stabilizing didoes of series connection, as described voltage stabilizing circuit after both parallel connections.
4. LED drive chip according to claim 1, is characterized in that, described boosting drive module setting DC chopper circuit converter.
5. the LED drive chip according to any one of Claims 1-4, is characterized in that, described LED drive chip is constant-current LED driving chip or constant-voltage LED driving chip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110138954.5A CN102291880B (en) | 2011-05-26 | 2011-05-26 | A kind of LED drive chip of low-voltage |
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| CN201110138954.5A CN102291880B (en) | 2011-05-26 | 2011-05-26 | A kind of LED drive chip of low-voltage |
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| CN102291880A CN102291880A (en) | 2011-12-21 |
| CN102291880B true CN102291880B (en) | 2015-12-16 |
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| CN107920404B (en) * | 2016-10-10 | 2019-05-24 | 矽诚科技股份有限公司 | LED drive system with quick voltage adjustment circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101556765A (en) * | 2008-04-07 | 2009-10-14 | 达方电子股份有限公司 | Digital converter, display control device and display control method |
| CN101616531A (en) * | 2008-06-24 | 2009-12-30 | 达方电子股份有限公司 | Digital converter, display control apparatus and method |
| CN102074214A (en) * | 2010-12-23 | 2011-05-25 | 上海大学 | Monolithic integrated LED (light emitting diode) backlight and LCD (liquid crystal display) power supply driving system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TW201107916A (en) * | 2009-08-24 | 2011-03-01 | Novatek Microelectronics Corp | Light emitting device capable of dynamically regulating output voltage and related control method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101556765A (en) * | 2008-04-07 | 2009-10-14 | 达方电子股份有限公司 | Digital converter, display control device and display control method |
| CN101616531A (en) * | 2008-06-24 | 2009-12-30 | 达方电子股份有限公司 | Digital converter, display control apparatus and method |
| CN102074214A (en) * | 2010-12-23 | 2011-05-25 | 上海大学 | Monolithic integrated LED (light emitting diode) backlight and LCD (liquid crystal display) power supply driving system |
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Inventor after: Xie Changjun Inventor after: Xiang Kui Inventor after: Wang Jin Inventor before: Shang Song |
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Effective date of registration: 20171113 Address after: 225651 Jiangsu province Yangzhou city Gaoyou city sends the town Qiao Hao road 001 Patentee after: Polytechnic High Tech Institute (Gaoyou) Co., Ltd. Address before: Futian District Che Kung Temple Tairan industrial zone of Shenzhen city in Guangdong province 518040 211 706 Patentee before: Shenzhen Zhongqingwei Technology Development Co., Ltd. |
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