CN202488822U - Light-emitting component control circuit and short-circuit detection circuit applied to same - Google Patents
Light-emitting component control circuit and short-circuit detection circuit applied to same Download PDFInfo
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- CN202488822U CN202488822U CN2012200556803U CN201220055680U CN202488822U CN 202488822 U CN202488822 U CN 202488822U CN 2012200556803 U CN2012200556803 U CN 2012200556803U CN 201220055680 U CN201220055680 U CN 201220055680U CN 202488822 U CN202488822 U CN 202488822U
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Abstract
The utility model provides a light-emitting component control circuit and a short-circuit detection circuit applied to the same. The light-emitting component control circuit is used for controlling the array of light-emitting components and comprises a plurality of light-emitting component strings, each of the light-emitting component strings comprises a plurality of the light-emitting components which are in series connection, each of the light-emitting components is provided with a first end and a second end, the first ends are connected with a common node, the second ends are separated from one another, the light-emitting component control circuit comprises a plurality of sensing contacts and the short-circuit detection circuit, the plurality of sensing contacts are coupled with the second ends for receiving signals of the second ends, the short circuit detection circuit is coupled with the plurality of sensing contacts for receiving a plurality of signals of the second ends, comparison signals are generated according to the fact that the signals of the second ends exceed or don't exceed reference values respectively, and short-circuit detection signals are generated according to fact that whether the number of the signals is between a first set value and a second set value.
Description
Technical field
The utility model relates to a kind of light-emitting component control circuit and is used for short circuit circuit for detecting wherein, is meant a kind of light-emitting component control circuit of detecting the light-emitting component short-circuit state especially and is used for short circuit circuit for detecting wherein.
Background technology
Fig. 1 shows a kind of typical light-emitting diode (light emitting device, LED) power control circuit sketch map.As shown in Figure 1, LED power control circuit 10 is in order to control led array 20.Wherein, LED power control circuit 10 comprises a plurality of contact T11, T12, T1n etc., is connected with each LED string negative end B respectively, receiving the curtage signal of each LED string negative end B, and feedbacks and controls led array 20.Each LED string forward end A then is connected in supply voltage Vout.
Generally speaking, in the LED power control circuit 10, whether short circuit detecting is higher than default reference value with the voltage of each LED string negative end B is judged, when the voltage of LED string negative end B surpasses default reference value, represents this LED string situation that is short-circuited.Yet when LED power control circuit 10 had dimming function, the mode of this kind judgement short-circuit state can be judged by accident.As shown in Figure 2, because dimming function is the light modulation signal (PWM dimming) that utilizes light adjusting circuit 11 to be produced, recently adjust the luminous intensity of LED string through the conducting in one-period and the work of not conducting LED string with PWM (PWM) mode.Yet, light modulation signal PWM dimming make LED go here and there not conducting during because LED string do not have electric current and do not produce pressure drop, so the negative end B voltage of LED string can and can surpass default reference value near supply voltage Vout, cause erroneous judgement.Therefore; If will correctly judge the LED string situation that whether is short-circuited; Need be under 100% condition at light modulation signal PWM dimming, that is to say, in possessing the LED power supply control chip 10 of dimming function; Need could detect the situation whether led array 20 is short-circuited in the complete bright situation of LED.This shows typical LED power supply control chip 10 on the mechanism of detecting short circuit, and is very limited, even under most situation, all can't detect the situation whether led array 20 is short-circuited.
In view of this, the utility model proposes a kind of can under the situation of various light modulation signals, the detecting light-emitting component control circuit of light-emitting component short circuit and be used for short circuit circuit for detecting wherein promptly to the deficiency of above-mentioned prior art.
Summary of the invention
The purpose of the utility model is to overcome the deficiency and the defective of prior art, proposes a kind of light-emitting component control circuit and is used for short circuit circuit for detecting wherein.
For reaching above-mentioned purpose, just wherein a viewpoint says that the utility model provides a kind of light-emitting component control circuit; In order to control a light-emitting device array; This light-emitting device array comprises a plurality of light-emitting component strings, and wherein each light-emitting component string comprises the light-emitting component of a plurality of series connection, and each light-emitting component string has first end and second end; First end of each light-emitting component string is connected in a common node; Said light-emitting component control circuit comprises: a plurality of sense-junction, and second end with each light-emitting component string couples respectively, to receive the second end signal of each light-emitting component string; An and short circuit circuit for detecting; Couple with these a plurality of sense-junction, receive this a plurality of second end signals, and according to this a plurality of second end signals and at least one reference value; To produce to a plurality of relatively signals that should a plurality of second end signals; And then according to this relatively signal number produce a short circuit detection signal whether between one first set point and one second set point, wherein this first set point is equal to or greater than 1; This second set point is equal to or less than this light-emitting component string sum and subtracts 1, and this first set point is less than this second set point.
With regard to another viewpoint speech; Whether the utility model also provides a kind of short circuit circuit for detecting that is used for the light-emitting component control circuit, be short-circuited in order to detect a light-emitting device array, and this light-emitting device array comprises a plurality of light-emitting component strings; Wherein each light-emitting component string comprises the light-emitting component of a plurality of series connection; And each light-emitting component string has first end and second end, and first end of each light-emitting component string is connected in a common node, and the said short circuit circuit for detecting that is used for the light-emitting component control circuit comprises: a comparison circuit; The second end signal and the reference value that compare each light-emitting component string respectively, and according to a plurality of relatively signals of comparative result generation; An and decision circuitry; Couple with this comparison circuit, and judge, with when this comparison signal number is between one first set point and one second set point according to these a plurality of comparison signals; Produce a short circuit detection signal; Wherein this first set point is equal to or greater than 1, and this second set point is equal to or less than this light-emitting component string sum and subtracts 1, and this first set point is less than this second set point.
Whether in a kind of therein enforcement kenel, this short circuit circuit for detecting comprises that more a short circuit flag produces circuit, according to this short circuit detection signal and this a plurality of relatively signals, come indivedual each light-emitting component string of demonstration to be short-circuited to produce the short circuit flag.
Aforementioned light-emitting component control circuit; Should more comprise a light adjusting circuit; In order to produce a light modulation signal, it is through conducting and these a plurality of light-emitting component strings of not conducting, to control this light-emitting device array brightness; And this short circuit detection signal does not produce this short circuit detection signal when this a plurality of light-emitting component string of this not conducting of light modulation signal.
Explain in detail through specific embodiment below, when the purpose that is easier to understand the utility model, technology contents, characteristics and the effect reached thereof.
Description of drawings
Fig. 1 shows a kind of typical LED power control circuit sketch map;
Fig. 2 shows LED power control circuit 10 sketch mapes with dimming function;
Fig. 3 and Fig. 4 show first embodiment of the utility model;
Fig. 5 shows second embodiment of the utility model;
Fig. 6 shows the 3rd embodiment of the utility model;
Fig. 7 shows the 4th embodiment of the utility model;
Fig. 8 shows the 5th embodiment of the utility model.
Symbol description among the figure
10 LED power control circuits
11,43 light adjusting circuits
20 led array 20
30,40 light-emitting component control circuits
31 short circuit circuit for detecting
311,411 comparison circuits
3111 comparators
313,413 decision circuitry
314 short circuit flags produce circuit
The A forward end
The B negative end
T11, T12, T1n, T21, T22, T23, T2n sense-junction
Vout supplies voltage
Embodiment
See also Fig. 3 and Fig. 4, show first embodiment of the utility model.As shown in Figure 3, light-emitting component control circuit 30 is in order to the control light-emitting device array; Light-emitting device array is such as but not limited to led array as shown in the figure 20; Led array 20 comprises a plurality of LED strings, and wherein each LED string comprises the LED element of a plurality of series connection, and each LED string has forward end A and negative end B; The forward end A of each LED string is connected in common node, to receive supply voltage Vout.
Wherein, light-emitting component control circuit 30 comprises a plurality of sense-junction T21, T22, T23, T2n etc. and short circuit circuit for detecting 31.Sense-junction T21, T22, T23, T2n couple with the negative end B of each LED string respectively, with the signal of the negative end B that receives each LED string.Short circuit circuit for detecting 31 couples with sense-junction T21, T22, T23, T2n; Signal with the negative end B that receives each LED string; Voltage signal such as but not limited to each negative end B; And do comprehensively to judge according to the voltage signal of each negative end B and the relativeness between the reference value, and produce the short circuit detection signal.
Please then consult Fig. 4, for example, can surpass the number of reference value, determine whether producing the short circuit detection signal and be short-circuited with demonstration according to the voltage signal of negative end B.As shown in the figure, when the voltage signal of negative end B surpasses the number of reference value, when being no more than first set point, be regarded as normal running, do not produce the short circuit detection signal.When the voltage signal of negative end B surpasses the number of reference value, when surpassing second set point, be regarded as keeping the last result who judges, keep original short circuit detection signal state.When the voltage signal of negative end B surpasses the number of reference value, between between first set point and second set point, be regarded as the situation of being short-circuited, generation short circuit detection signal.Wherein, first set point for example can be set at 1, the second set point and for example can be set at LED string sum and subtract 1, and the voltage signal of expression negative end B surpasses the number of reference value, when having 1 string at least and being less than LED string sum, has been judged as short-circuit state.This because of; When circuit carry out the PWM light modulation according to the light modulation signal and at the PWM signal when closing the state of (PWM off); The all not conductings simultaneously of all LED string so equal the LED string when total if the voltage signal of negative end B surpasses the number of reference value, should not be confirmed as the situation of being short-circuited immediately; But when surpassing reference value, then can be judged as the situation of being short-circuited as if the voltage signal that partial L ED string negative end B is only arranged.So, in the time of can getting rid of all LED strings of not conducting of light modulation signal, judge shortcoming by accident into short-circuit state.But certainly, look demands of applications and decide, first set point must not be set at 1 and can be greater than 1; Second set point must not subtract 1 for LED goes here and there sum, and can be set at other number less than LED string sum.
Fig. 5 shows second embodiment of the utility model.Present embodiment shows the embodiment that short circuit circuit for detecting 31 is more concrete.As shown in Figure 5, short circuit circuit for detecting 31 comprises comparison circuit 311 and decision circuitry 313.Comparison circuit 311; Couple with sense-junction T21, T22, T23, T2n, compare signal and the reference value of the negative end B of each light-emitting component string respectively, and produce the comparison signal respectively according to comparative result; This comparison signal signal that is multidigit wherein, or also can be considered a plurality of relatively signals.Decision circuitry 313 couples with comparison circuit 311, and according to the number that compares signal, to produce the short circuit detection signal.
Fig. 6 shows the 3rd embodiment of the utility model.Present embodiment shows short circuit circuit for detecting 31 embodiment more specifically.As shown in Figure 6; Comparison circuit 311 comprises a plurality of comparators 3111; Couple with corresponding sense-junction T21, T22, T23, T2n respectively,, and produce the comparison signal respectively according to comparative result with relatively signal and the reference value of the negative end B of each light-emitting component string respectively; For example when the signal of the negative end B of light-emitting component string surpasses reference value, produce relatively signal.Decision circuitry 313 couples with comparison circuit 311, and counts the relatively number of signal, to produce the short circuit detection signal.
Fig. 7 shows the 4th embodiment of the utility model.Among aforementioned each embodiment; Be when any a string or multi-string LED string is short-circuited; Whether produce single short circuit detection signal, present embodiment shows that then short circuit circuit for detecting 31 can more comprise the short circuit flag and produce circuit 314, come indivedual each LED string that show to be short-circuited to produce the short circuit flag.The short circuit flag produces circuit 314 for example can be as shown in the figure; Receive the short circuit detection signal; Carry out logical operation with the output of each comparator 3111; This is equivalent to the short circuit detection signal as enable signal, controls the output of each comparator 3111, can show that so which (or a plurality of) LED string what be short-circuited is.
Fig. 8 shows the 5th embodiment of the utility model.Present embodiment shows light-emitting component control circuit 40 another kind of embodiment.Different with second embodiment is; As shown in Figure 8, light-emitting component control circuit 40 more comprises light adjusting circuit 43, in order to produce the light modulation signal; It is through conducting and a plurality of light-emitting component strings of not conducting; With control light-emitting device array 20 brightness, and the short circuit detection signal does not produce this short circuit detection signal when a plurality of light-emitting component string of not conducting of light modulation signal.The light modulation signal for example can be directly and the short circuit detection signal do and logical operation, or input comparison circuit 411 to stop to judge action, can also be imported decision circuitry 413, to stop the counting action.
Below to preferred embodiment the utility model is described, just the above is merely the content that makes those skilled in the art be easy to understand the utility model, is not the interest field that is used for limiting the utility model.Under the same spirit of the utility model, those skilled in the art can think and various equivalence changes.For example, direct-connected two circuit of icon or interelement among the embodiment, can plant does not influence other circuit or the element of major function; And for example, show among the embodiment that each comparator 311 receives identical reference value, but this is nonessential, each comparator 311 can receive identical or different reference value; And for example, light-emitting component is not limited to the light-emitting diode shown in each embodiment, also can extend to the light-emitting component that all need DC control, like optical conductor etc.; And for example; The light-emitting component string also can be the structure of reversal connection; That is supply voltage Vout is that the negative end of negative voltage and light-emitting component string couples with supply voltage Vout, forward end couples with sense-junction T21, T22, T23, T2n, and circuit and related signal should be done corresponding adjustment at this moment; And for example, the positive and negative terminal of comparator 311 can exchange among the embodiment, and the comparison signal of comparator 311 outputs this moment will be represented the abnormality of this string LED with low level, and decision circuitry 313 also should be made corresponding change with short circuit flag generation circuit 314; And for example; As everyone knows, smith trigger (Smith trigger) is in the accurate transition of setting in position, so be set at reference value like the transition position standard with smith trigger; Smith trigger promptly has the effect that is equivalent to comparator, so smith trigger also can be considered a kind of comparator.The scope of the utility model should contain above-mentioned and other all equivalences change.
Claims (7)
1. light-emitting component control circuit; In order to control a light-emitting device array, this light-emitting device array comprises a plurality of light-emitting component strings, and wherein each light-emitting component string comprises the light-emitting component of a plurality of series connection; And each light-emitting component string has first end and second end; First end of each light-emitting component string is connected in a common node, it is characterized in that said light-emitting component control circuit comprises:
A plurality of sense-junction, second end with each light-emitting component string couples respectively, to receive the second end signal of each light-emitting component string; And
One short circuit circuit for detecting; Couple with these a plurality of sense-junction, receive this a plurality of second end signals, and according to this a plurality of second end signals and at least one reference value; To produce to a plurality of relatively signals that should a plurality of second end signals; And then according to this relatively signal number produce a short circuit detection signal whether between one first set point and one second set point, wherein this first set point is equal to or greater than 1; This second set point is equal to or less than this light-emitting component string sum and subtracts 1, and this first set point is less than this second set point.
2. light-emitting component control circuit as claimed in claim 1 is characterized in that, this short circuit circuit for detecting comprises:
One comparison circuit, the relatively second end signal of each light-emitting component string and this at least one reference value respectively, and produce this a plurality of comparison signals respectively according to comparative result; And
One decision circuitry couples with this comparison circuit, and according to these a plurality of relatively numbers of signal, to produce this short circuit detection signal.
3. light-emitting component control circuit as claimed in claim 1; It is characterized in that; Whether this short circuit circuit for detecting comprises that more a short circuit flag produces circuit, according to this short circuit detection signal and this a plurality of relatively signals, come indivedual each light-emitting component string of demonstration to be short-circuited to produce the short circuit flag.
4. light-emitting component control circuit as claimed in claim 1; It is characterized in that, also comprise a light adjusting circuit, in order to produce a light modulation signal; It is through conducting and these a plurality of light-emitting component strings of not conducting; Controlling this light-emitting device array brightness, and this short circuit detection signal does not produce this short circuit detection signal when this a plurality of light-emitting component string of this not conducting of light modulation signal.
5. short circuit circuit for detecting that is used for the light-emitting component control circuit; Whether be short-circuited in order to detect a light-emitting device array, this light-emitting device array, wherein each light-emitting component string comprises the light-emitting component of a plurality of series connection if comprising a plurality of light-emitting component strings; And each light-emitting component string has first end and second end; First end of each light-emitting component string is connected in a common node, it is characterized in that, the said short circuit circuit for detecting that is used for the light-emitting component control circuit comprises:
One comparison circuit, the relatively second end signal and at least one reference value of each light-emitting component string respectively, and produce a plurality of comparison signals according to comparative result; And
One decision circuitry; Couple with this comparison circuit, and judge, with when this comparison signal number is between one first set point and one second set point according to these a plurality of comparison signals; Produce a short circuit detection signal; Wherein this first set point is equal to or greater than 1, and this second set point is equal to or less than this light-emitting component string sum and subtracts 1, and this first set point is less than this second set point.
6. the short circuit circuit for detecting that is used for the light-emitting component control circuit as claimed in claim 5; It is characterized in that; This short circuit circuit for detecting comprises that more a short circuit flag produces circuit; According to a plurality of relatively signals of this short circuit detection signal and this, come to show individually whether each light-emitting component string is short-circuited to produce the short circuit flag.
7. the short circuit circuit for detecting that is used for the light-emitting component control circuit as claimed in claim 5; It is characterized in that this light-emitting component control circuit comprises a light adjusting circuit, in order to produce a light modulation signal; It is through conducting and these a plurality of light-emitting component strings of not conducting; Controlling this light-emitting device array brightness, and this short circuit detection signal does not produce this short circuit detection signal when this a plurality of light-emitting component string of this not conducting of light modulation signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200556803U CN202488822U (en) | 2012-02-20 | 2012-02-20 | Light-emitting component control circuit and short-circuit detection circuit applied to same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200556803U CN202488822U (en) | 2012-02-20 | 2012-02-20 | Light-emitting component control circuit and short-circuit detection circuit applied to same |
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| CN202488822U true CN202488822U (en) | 2012-10-10 |
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| CN2012200556803U Expired - Lifetime CN202488822U (en) | 2012-02-20 | 2012-02-20 | Light-emitting component control circuit and short-circuit detection circuit applied to same |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103295552A (en) * | 2013-06-18 | 2013-09-11 | 深圳市华星光电技术有限公司 | Light emitting diode (LED) backlight driving circuit and method |
| CN103874274A (en) * | 2012-12-07 | 2014-06-18 | 力智电子股份有限公司 | Short-circuit protection circuit and short-circuit protection method of light-emitting diode and driving device thereof |
| US20140333204A1 (en) * | 2013-05-08 | 2014-11-13 | Shenzhen China Star Optoelectronics Technology Co., Ltd | Led backlight driving circuit, lcd device, and method for driving the led backlight driving circuit |
| CN107025887A (en) * | 2016-01-29 | 2017-08-08 | 立锜科技股份有限公司 | Display device and drive circuit therein and its driving method with test function |
| CN109490767A (en) * | 2018-11-05 | 2019-03-19 | 浙江大华技术股份有限公司 | Gas lamp switching device short-circuit detecting circuit, method, apparatus and storage medium |
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2012
- 2012-02-20 CN CN2012200556803U patent/CN202488822U/en not_active Expired - Lifetime
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103874274A (en) * | 2012-12-07 | 2014-06-18 | 力智电子股份有限公司 | Short-circuit protection circuit and short-circuit protection method of light-emitting diode and driving device thereof |
| CN103874274B (en) * | 2012-12-07 | 2016-09-14 | 力智电子股份有限公司 | Short-circuit protection circuit and short-circuit protection method of light-emitting diode and driving device thereof |
| US20140333204A1 (en) * | 2013-05-08 | 2014-11-13 | Shenzhen China Star Optoelectronics Technology Co., Ltd | Led backlight driving circuit, lcd device, and method for driving the led backlight driving circuit |
| US9258862B2 (en) * | 2013-05-08 | 2016-02-09 | Shenzhen China Star Optoelectronics Technology Co., Ltd | LED backlight driving circuit, LCD device, and method for driving the LED backlight driving circuit |
| CN103295552A (en) * | 2013-06-18 | 2013-09-11 | 深圳市华星光电技术有限公司 | Light emitting diode (LED) backlight driving circuit and method |
| WO2014201713A1 (en) * | 2013-06-18 | 2014-12-24 | 深圳市华星光电技术有限公司 | Led backlight drive circuit and backlight drive method |
| US20140375213A1 (en) * | 2013-06-18 | 2014-12-25 | Shenzhen China Star Optoelectronics Technology Co., Ltd | Led backlight driving circuit and method for driving the led backlight driving circuit |
| US9232589B2 (en) * | 2013-06-18 | 2016-01-05 | Shenzhen China Star Optoelectronics Technology Co., Ltd | LED backlight driving circuit and method for driving the LED backlight driving circuit |
| CN107025887A (en) * | 2016-01-29 | 2017-08-08 | 立锜科技股份有限公司 | Display device and drive circuit therein and its driving method with test function |
| CN107025887B (en) * | 2016-01-29 | 2019-07-26 | 立锜科技股份有限公司 | Display equipment and driving circuit therein and its driving method with test function |
| CN109490767A (en) * | 2018-11-05 | 2019-03-19 | 浙江大华技术股份有限公司 | Gas lamp switching device short-circuit detecting circuit, method, apparatus and storage medium |
| CN109490767B (en) * | 2018-11-05 | 2021-08-27 | 浙江大华技术股份有限公司 | Gas lamp switching device short circuit detection circuit, method, device and storage medium |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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| CX01 | Expiry of patent term |
Granted publication date: 20121010 |