CN1725927A - LED chip drive circuit - Google Patents
LED chip drive circuit Download PDFInfo
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- CN1725927A CN1725927A CN 200510036050 CN200510036050A CN1725927A CN 1725927 A CN1725927 A CN 1725927A CN 200510036050 CN200510036050 CN 200510036050 CN 200510036050 A CN200510036050 A CN 200510036050A CN 1725927 A CN1725927 A CN 1725927A
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Abstract
A LED chip driving circuit connects driving IC and LED chip in sequence and over-temp protective circuit is connected between driving IC and LED chip. It is suitable for flashlight and other portable lighting device.
Description
Technical field
The present invention relates to a kind of driving and protective circuit of high-power LED illumination circuit, particularly a kind of high-power LED chip.
Background technology
The semiconductor lighting technology, light-emitting diode (Light Emitting Diode) is called for short the LED lighting technology and has entered practicability period with its applying flexible, environmental protection, extra long life, plurality of advantages such as easy to adjust and energy-conservation.For the high-power LED illumination drive circuit, except that the conversion of DC-to-DC, also there is not a kind of perfect functions protective circuit in the prior art.
Summary of the invention
The purpose of this invention is to provide a kind of led chip drive circuit, the technical problem that solve is when providing high efficiency DC-to-DC to change for led chip, also to provide perfect defencive function for led chip.
The present invention is by the following technical solutions: a kind of led chip drive circuit, the drive IC that has been linked in sequence and led chip are connected with the too high protective circuit of temperature between described drive IC and the led chip.
Be connected to lithium battery protection circuit before the drive IC of the present invention.
Also be connected with the change light control circuit between drive IC of the present invention and the led chip.
The front end of entire circuit of the present invention is connected with DC power supply protection to error-polarity connection circuit.
Drive IC of the present invention is the driven management IC that boosts, its 1 pin ground connection, 2 pin are through the 4th capacity earth, 3 pin are through the 5th capacity earth, 5 pin connect first diode cathode, 6 pin connect the led chip negative pole through the 7th resistance, 7 pin connect the grid of second field effect transistor, and the source electrode of second field effect transistor is through the 8th grounding through resistance, and drain electrode connects positive source through first inductance, drain electrode connects the negative pole of led chip simultaneously through first diode, 8 pin of drive IC connect the source electrode of second field effect transistor, and the positive pole of first electric capacity connects positive source, minus earth, the positive pole of second electric capacity connects first diode cathode, the minus earth of second electric capacity.
The too high protective circuit of temperature of the present invention comprises and is connected the 4th resistance and the 6th resistance between led chip positive pole and drive IC 6 pin, that be in series; Lithium battery protection circuit comprises li-ion cell protection IC, and its 4 pin connects 4 pin of drive IC, and 1 pin is through the 3rd grounding through resistance, and 2 pin connect positive source through first resistance, 3 pin ground connection, serial connection the 3rd electric capacity between 2 pin and 3 pin; Become 6 pin of the 5th resistance one termination drive IC of light control circuit, the drain electrode of another termination the 3rd field effect transistor, the source electrode of the 3rd field effect transistor connects the tie point of led chip negative pole and the 9th resistance one end, the other end ground connection of the 9th resistance, the grid of the 3rd field effect transistor connects the tie point of the tenth resistance one end and the 11 resistance one end, the other end of the tenth resistance connects positive source through dimmer switch, the other end ground connection of the 11 resistance; Second resistance, the one termination power positive pole of DC power supply protection to error-polarity connection circuit, the other end connects the grid of first field effect transistor simultaneously through the second diode ground connection of reversal connection, the source ground of first field effect transistor, drain electrode connects the input power cathode.
Of the present invention first; the second and the 3rd field effect transistor is selected Si2302 for use; first diode is selected 1N5817 for use; second diode is selected 1N4148 for use; the driven management of boosting IC selects S-8340 for use; li-ion cell protection IC selects S8241 for use, and first; second electric capacity is selected 100 μ/10V, the 3rd for use; the the 4th and the 5th electric capacity is selected 0.1 μ for use; first inductance is selected 22 μ H for use; first resistance is selected 470 Ω, second for use; the 3rd resistance is selected 1K for use, and the 4th resistance is selected 24K for use; the 5th resistance is selected 55K for use; the 6th resistance is selected NTC10K for use, and the 7th resistance is selected 7.5K for use, and the 8th; the 9th resistance is selected 0.25 Ω for use; the tenth resistance is selected 10K for use, and the 11 resistance is selected 100K for use.
Drive IC of the present invention is step-down driven management IC, its 2 pin ground connection, 3 pin connect the led chip negative pole through the 7th resistance, and 5 pin connect the source electrode of second field effect transistor, 4 pin connect the grid of second field effect transistor, drain electrode connects the negative pole of led chip through first inductance, and drain electrode connects first diode cathode, the plus earth of first diode simultaneously, the positive pole of first electric capacity connects the source electrode of second field effect transistor, minus earth, the positive pole of second electric capacity connect that first inductance connects and the led chip positive pole between tie point, minus earth.
The too high protective circuit of temperature of the present invention comprises and is connected the 4th resistance and the 6th resistance between led chip positive pole and drive IC 3 pin, that be in series; Lithium battery protection circuit comprises li-ion cell protection IC, and its 4 pin connects 1 pin of drive IC, and 1 pin is through the 3rd grounding through resistance, and 2 pin connect the source electrode of first, second effect pipe, 3 pin ground connection, serial connection the 3rd electric capacity between 2 pin and 3 pin through first resistance; Become 3 pin of the 5th resistance one termination drive IC of light control circuit, the drain electrode of another termination the 3rd field effect transistor, the source electrode of the 3rd field effect transistor connects the tie point of led chip negative pole and the 9th resistance one end, the other end ground connection of the 9th resistance, the grid of the 3rd field effect transistor connects the tie point of the tenth resistance one end and the 11 resistance one end, the other end of the tenth resistance connects positive source through the source electrode and the drain electrode of dimmer switch, first field effect transistor, the other end ground connection of the 11 resistance; Second resistance, the one end ground connection of DC power supply protection to error-polarity connection circuit, the grid of another termination first field effect transistor, second diode through forward connects positive source simultaneously, and the drain electrode of first field effect transistor connects positive source, power cathode ground connection.
Of the present invention first; second field effect transistor is selected IRF7328 for use; the 3rd field effect transistor is selected Si2302 for use; first diode is selected 1N5817 for use; second diode is selected 1N4148 for use, and step-down driven management IC selects S-8520 for use, and li-ion cell protection IC selects S8241 for use; first; second electric capacity is selected 100 μ/10V for use; the 3rd electric capacity is selected 0.1 μ for use, and first inductance is selected 22 μ H for use, and first resistance is selected 470 Ω for use; second; the 3rd resistance is selected 1K for use; the 4th resistance is selected 1K for use, and the 5th resistance is selected 55K for use, and the 6th resistance is selected NTC10K for use; the 7th resistance is selected 7.5K for use; the 9th resistance is selected 0.25 Ω for use, and the tenth resistance is selected 10K for use, and the 11 resistance is selected 100K for use.
The present invention compared with prior art; be connected with the too high protective circuit of temperature between drive IC and the led chip; when the working temperature of led chip raises; the resistance of negative temperature type thermo-sensitive resistor diminishes in the too high protective circuit of temperature, and the comparator input terminal voltage of drive IC is raise, and power output descends; when otherwise temperature is hanged down; power output strengthens, and plays the effect of constant temperature protection, is specially adapted to flashlight or other portable lighting lamps.
Description of drawings
Fig. 1 is the circuit theory diagrams () of the embodiment of the invention.
Fig. 2 is the circuit theory diagrams (two) of the embodiment of the invention.
Embodiment
Below in conjunction with drawings and Examples the present invention is described in further detail.As shown in Figure 1, be linked in sequence between led chip drive circuit power supply of the present invention and the led chip DC power supply protection to error-polarity connection circuit, lithium battery protection circuit, drive IC, the too high protective circuit of temperature in parallel and become light control circuit.
The function of DC power supply protection to error-polarity connection circuit is in DC power supply, i.e. protection is provided during battery input error-polarity connection.Lithium battery protection circuit only just uses when adopting repeatedly recharge lithium ion Li-ion battery; when input supply voltage is low to moderate the 2.3V left and right sides; its low level of output control terminal DOUT output drags down 4 pin (ON/OFF) of drive IC U2, and 4 pin of drive IC U2 are that power switch signal input normality is a high level.The too high protective circuit of temperature can be turned down power output automatically when led chip work is overheated.Become the change optical circuit of light control circuit into led chip, one of every increase becomes light control circuit, just can increase a light modulation gear.
The first contact J1 of DC power supply protection to error-polarity connection circuit is that the power supply input is anodal; the second contact J2 is a power supply input negative pole; the second contact J2 is connected to negative electricity by the drain D of the first field effect transistor Q1 source S of the first field effect transistor Q1; the direct ground connection of the source S of the first field effect transistor Q1; the grid G of the first field effect transistor Q1 meets the first contact J1 through second resistance R 2; the plus earth of the second diode D2, negative pole are connected between the grid of second resistance R 2 and the first field effect transistor Q1.
Lithium battery protection circuit comprises li-ion cell protection IC U1; its the 2 pin VDD utmost points are directly received positive source by first resistance R 1; its 3 pin VSS utmost point ground connection; its 1 pin VM adjustable side is by the 3rd resistance R 3 ground connection; serial connection the 3rd capacitor C 3 between 2 pin and 3 pin; its 4 pin DOUT signal output pins are connected to the 4th pin of drive IC U2, and the 4th pin of drive IC U2 is a power supply input control pin.
Drive IC U2 is booster type driven management IC, and it and first inductance L 1, the second field effect transistor Q2, the first diode D1, first capacitor C 1, second capacitor C 2 and the 8th resistance R 8 are formed a step-up switching power supply circuit.The 1 pin ground connection of drive IC U2,2 pin are through the 4th capacitor C 4 ground connection, 3 pin are through the 5th capacitor C 5 ground connection, 5 pin connect contact between the negative pole of the negative pole of the first diode D1 and led chip, 6 pin connect the led chip negative pole through the 7th resistance R 7,7 pin connect the grid G of the second field effect transistor Q2, the source S of the second field effect transistor Q2 is through the 8th resistance R 8 ground connection, drain D connects positive source through first inductance L 1, drain D connects the negative pole of led chip simultaneously through the first diode D1,8 pin of drive IC U2 connect the source S of the second field effect transistor Q2, the positive pole of first capacitor C 1 connects positive source, minus earth, the positive pole of second capacitor C 2 connect contact between the negative pole of the first diode D1 negative pole and led chip, the minus earth of second capacitor C 2.
The 4th resistance R 4 in the too high protective circuit of temperature and 6 series connection of the 6th resistance R are connected between the 6 pin VOUT/FB end of led chip positive pole and drive IC U2.The 6th resistance R 6 is negative temperature type thermo-sensitive resistor NTC, and when the working temperature of led chip raise, the resistance of the 6th resistance R 6 can diminish, thereby has changed the 6th pin voltage of drive IC U2, because the 6th pin voltage of drive IC U2 is when raising, power output descends.When otherwise temperature was hanged down, power output strengthened, and this circuit plays the effect of constant temperature protection.
The 5th resistance R 5 one ends in the change light control circuit are connected the 6th pin of drive IC U2, the other end is connected the drain D of the 3rd field effect transistor Q3, the source S of the 3rd field effect transistor Q3 and the 7th resistance R 7 are connected to the positive pole of led chip and the tie point of the 9th resistance R 9 one ends, the 9th resistance R 9 other end ground connection.The other end of the 7th resistance R 7 is received the 6th pin of U2.The tenth resistance R 10 and the 11 resistance R 11 are formed a potential-divider network, be connected to the grid G of the 3rd field effect transistor Q3, the other end ground connection of the 11 resistance R 11, the end of another termination dimmer switch S1 of the tenth resistance R 10, another termination positive source of dimmer switch S1.
The first field effect transistor Q1; second field effect transistor Q2 and the 3rd field effect transistor Q3 select Si2302 for use; the first diode D1 selects 1N5817 for use; the second diode D2 selects 1N4148 for use; the driven management of boosting IC U2 selects S-8340 for use; li-ion cell protection IC U1 selects S8241 for use; first capacitor C 1; second capacitor C 2 is selected 100 μ/10V for use; the 3rd capacitor C 3; the 4th capacitor C 4 and the 5th capacitor C 5 are selected 0.1 μ for use; first inductance L 1 is selected 22 μ H for use; first resistance R 1 is selected 470 Ω for use, second resistance R 2; the 3rd resistance R 3 is selected 1K for use, and the 4th resistance R 4 is selected 24K for use; the 5th resistance R 5 is selected 55K for use; the 6th resistance R 6 is selected NTC10K for use, and the 7th resistance R 7 is selected 7.5K for use, the 8th resistance R 8; the 9th resistance R 9 is selected 0.25 Ω for use; the tenth resistance R 10 is selected 10K for use, and the 11 resistance R 11 is selected 100K for use.According to the led chip of different capacity can corresponding adjustment the 4th resistance, the value of the 6th resistance, the 7th resistance and the 5th resistance reaches desirable power output.
The operation principle of DC power supply protection to error-polarity connection circuit is: when the input error-polarity connection of power supply; the J2 input is a positive electricity; the first field effect transistor Q1 is a N channel field-effect pipe; when the grid G of the first field effect transistor Q1 is negative supply; can not conducting between the drain D of the first field effect transistor Q1 and the source S, play the effect of protection late-class circuit.
Lithium battery protection circuit is the single-unit li-ion cell protection IC of a routine, has saved the two N channel field-effect pipes supporting with it in this circuit, the control input end of its control output end direct controlling and driving IC U2 Switching Power Supply.
Too high protective circuit of temperature and the 7th resistance R 7 have been formed one and have been subjected to temperature controlled resistor voltage divider network, and its dividing point is subjected to Temperature Influence and changes the 6th pin voltage of drive IC U2, reach the purpose of regulating the power output size.Simultaneously, the 3rd field effect transistor Q3 and the 5th resistance R 5 are connected in parallel between the two ends of the 7th resistance R 7.When dimmer switch S1 closes, the grid G of the 3rd field effect transistor Q3 has the positive electrical signal, the 3rd field effect transistor Q3 conducting, equal the 5th resistance R 5 and 7 parallel connections of the 7th resistance R, thereby dragged down the 6th pin voltage of drive IC U2, its output voltage has been increased, thereby increased power output, close and open dimmer switch S1, can play the brightness output effect of regulating led chip.The 9th resistance R 9 is a constant current resistance, when the electric current of led chip is excessive, the voltage increases at the 9th resistance R 9 two ends, cause the 9th resistance R 9 and the 7th resistance R 7 are directly to receive after the series connection on the ground, so the voltage increases of the 9th resistance R 9 can make the 6th pin voltage of drive IC U2 also increase, when the offset voltage value that is increased to above drive IC U2, drive IC U2 can reduce power output, plays the constant current effect.
As shown in Figure 2; the first contact J1 of DC power supply protection to error-polarity connection circuit is that the power supply input is anodal; the second contact J2 is a power supply input negative pole; and ground connection; second resistance R, 2 one end ground connection; the grid G of another termination first field effect transistor Q1 connects positive source through the second diode D2 of forward simultaneously, and the drain D of the first field effect transistor Q1 connects positive source.
Lithium battery protection circuit comprises li-ion cell protection IC U1; its the 2 pin VDD utmost points connect the source S of the first field effect transistor Q1 by first resistance R 1; its 3 pin VSS utmost point ground connection; its 1 pin VM adjustable side is by the 3rd resistance R 3 ground connection; serial connection the 3rd capacitor C 3 between 2 pin and 3 pin; its 4 pin DOUT signal output pins are connected to the 1st pin of drive IC U2, and the 1st pin of drive IC U2 is a power supply input control pin.
Drive IC U2 is voltage-dropping type driven management IC, and it and first inductance L 1, the second field effect transistor Q2, the first diode D1, first capacitor C 1, second capacitor C 2 and the 8th resistance R 8 are formed an adjusting and voltage-reduction switch power circuit.The 2 pin ground connection of drive IC U2,3 pin connect the led chip negative pole through the 7th resistance R 7,5 pin connect the source S of the first field effect transistor Q1, the second field effect transistor Q2,4 pin connect the grid G of the second field effect transistor Q2, drain D connects the negative pole of led chip through first inductance L 1, drain D connects the first diode D1 negative pole simultaneously, the plus earth of the first diode D1, the positive pole of first capacitor C 1 connects the source S of the first field effect transistor Q1, the second field effect transistor Q2, minus earth, the positive pole of second capacitor C 2 connect that first inductance connects and the led chip positive pole between tie point, minus earth.
The 4th resistance R 4 in the too high protective circuit of temperature and 6 series connection of the 6th resistance R are connected between the 3 pin VOUT end of led chip positive pole and drive IC U2.The 6th resistance R 6 is negative temperature type thermo-sensitive resistor NTC, and when the working temperature of led chip raise, the resistance of the 6th resistance R 6 can diminish, thereby has changed the 3rd pin voltage of drive IC U2, because the 3rd pin voltage of drive IC U2 is when raising, power output descends.When otherwise temperature was hanged down, power output strengthened, and this circuit plays the effect of constant temperature protection.
The 5th resistance R 5 one ends in the change light control circuit are connected the 3rd pin of drive IC U2, the other end is connected the drain D of the 3rd field effect transistor Q3, the source S of the 3rd field effect transistor Q3 and the 7th resistance R 7 are connected to the positive pole of led chip and the tie point of the 9th resistance R 9 one ends, the 9th resistance R 9 other end ground connection.The other end of the 7th resistance R 7 is received the 3rd pin of U2.The tenth resistance R 10 and the 11 resistance R 11 are formed a potential-divider network, be connected to the grid G of the 3rd field effect transistor Q3, the other end ground connection of the 11 resistance R 11, the end of another termination dimmer switch S1 of the tenth resistance R 10, the source S of another termination first field effect transistor Q1 of dimmer switch S1, the first field effect transistor Q1 drain D connects positive source.
The first field effect transistor Q1; the second field effect transistor Q2 selects IRF7328 for use; the 3rd field effect transistor Q3 selects Si2302 for use; the first diode D1 selects 1N5817 for use; the second diode D2 selects 1N4148 for use; step-down driven management IC U2 selects S-8520 for use; li-ion cell protection IC U1 selects S8241 for use; first capacitor C 1; second capacitor C 2 is selected 100 μ/10V for use; the 3rd capacitor C 3 is selected 0.1 μ for use, and first inductance L 1 is selected 22 μ H for use, and first resistance R 1 is selected 470 Ω for use; second resistance R 2; the 3rd resistance R 3 is selected 1K for use; the 4th resistance R 4 is selected 1K for use, and the 5th resistance R 5 is selected 55K for use, and the 6th resistance R 6 is selected NTC10K for use; the 7th resistance R 7 is selected 7.5K for use; the 9th resistance R 9 is selected 0.25 Ω for use, and the tenth resistance R 10 is selected 10K for use, and the 11 resistance R 11 is selected 100K for use.
Claims (10)
1. led chip drive circuit, the drive IC that has been linked in sequence and led chip is characterized in that: be connected with the too high protective circuit of temperature between described drive IC and the led chip.
2. led chip drive circuit according to claim 1 is characterized in that: be connected to lithium battery protection circuit before the described drive IC.
3. led chip drive circuit according to claim 2 is characterized in that: also be connected with the change light control circuit between described drive IC and the led chip.
4. led chip drive circuit according to claim 3 is characterized in that: the front end of described entire circuit is connected with DC power supply protection to error-polarity connection circuit.
5. led chip drive circuit according to claim 4, it is characterized in that: described drive IC is the driven management IC that boosts, its 1 pin ground connection, 2 pin are through the 4th capacity earth, 3 pin are through the 5th capacity earth, 5 pin connect first diode cathode, 6 pin connect the led chip negative pole through the 7th resistance, 7 pin connect the grid of second field effect transistor, the source electrode of second field effect transistor is through the 8th grounding through resistance, drain electrode connects positive source through first inductance, and drain electrode connects the negative pole of led chip simultaneously through first diode, and 8 pin of drive IC connect the source electrode of second field effect transistor, the positive pole of first electric capacity connects positive source, minus earth, the positive pole of second electric capacity connects first diode cathode, the minus earth of second electric capacity.
6. led chip drive circuit according to claim 5 is characterized in that: the too high protective circuit of described temperature comprises and is connected the 4th resistance and the 6th resistance between led chip positive pole and drive IC 6 pin, that be in series; Lithium battery protection circuit comprises li-ion cell protection IC, and its 4 pin connects 4 pin of drive IC, and 1 pin is through the 3rd grounding through resistance, and 2 pin connect positive source through first resistance, 3 pin ground connection, serial connection the 3rd electric capacity between 2 pin and 3 pin; Become 6 pin of the 5th resistance one termination drive IC of light control circuit, the drain electrode of another termination the 3rd field effect transistor, the source electrode of the 3rd field effect transistor connects the tie point of led chip negative pole and the 9th resistance one end, the other end ground connection of the 9th resistance, the grid of the 3rd field effect transistor connects the tie point of the tenth resistance one end and the 11 resistance one end, the other end of the tenth resistance connects positive source through dimmer switch, the other end ground connection of the 11 resistance; Second resistance, the one termination power positive pole of DC power supply protection to error-polarity connection circuit, the other end connects the grid of first field effect transistor simultaneously through the second diode ground connection of reversal connection, the source ground of first field effect transistor, drain electrode connects the input power cathode.
7. led chip drive circuit according to claim 6; it is characterized in that: described first; the second and the 3rd field effect transistor is selected Si2302 for use; first diode is selected 1N5817 for use; second diode is selected 1N4148 for use; the driven management of boosting IC selects S-8340 for use; li-ion cell protection IC selects S8241 for use; first; second electric capacity is selected 100 μ/10V for use; the 3rd; the the 4th and the 5th electric capacity is selected 0.1 μ for use, and first inductance is selected 22 μ H for use, and first resistance is selected 470 Ω for use; second; the 3rd resistance is selected 1K for use; the 4th resistance is selected 24K for use, and the 5th resistance is selected 55K for use, and the 6th resistance is selected NTC10K for use; the 7th resistance is selected 7.5K for use; the 8th; the 9th resistance is selected 0.25 Ω for use, and the tenth resistance is selected 10K for use, and the 11 resistance is selected 100K for use.
8. led chip drive circuit according to claim 4, it is characterized in that: described drive IC is step-down driven management IC, its 2 pin ground connection, 3 pin connect the led chip negative pole through the 7th resistance, 5 pin connect the source electrode of second field effect transistor, 4 pin connect the grid of second field effect transistor, drain electrode connects the negative pole of led chip through first inductance, drain electrode connects first diode cathode simultaneously, the plus earth of first diode, the positive pole of first electric capacity connects the source electrode of second field effect transistor, minus earth, the positive pole of second electric capacity connect that first inductance connects and the led chip positive pole between tie point, minus earth.
9. led chip drive circuit according to claim 8 is characterized in that: the too high protective circuit of described temperature comprises and is connected the 4th resistance and the 6th resistance between led chip positive pole and drive IC 3 pin, that be in series; Lithium battery protection circuit comprises li-ion cell protection IC, and its 4 pin connects 1 pin of drive IC, and 1 pin is through the 3rd grounding through resistance, and 2 pin connect the source electrode of first, second effect pipe, 3 pin ground connection, serial connection the 3rd electric capacity between 2 pin and 3 pin through first resistance; Become 3 pin of the 5th resistance one termination drive IC of light control circuit, the drain electrode of another termination the 3rd field effect transistor, the source electrode of the 3rd field effect transistor connects the tie point of led chip negative pole and the 9th resistance one end, the other end ground connection of the 9th resistance, the grid of the 3rd field effect transistor connects the tie point of the tenth resistance one end and the 11 resistance one end, the other end of the tenth resistance connects positive source through the source electrode and the drain electrode of dimmer switch, first field effect transistor, the other end ground connection of the 11 resistance; Second resistance, the one end ground connection of DC power supply protection to error-polarity connection circuit, the grid of another termination first field effect transistor, second diode through forward connects positive source simultaneously, and the drain electrode of first field effect transistor connects positive source, power cathode ground connection.
10. led chip drive circuit according to claim 9; it is characterized in that: described first; second field effect transistor is selected IRF7328 for use; the 3rd field effect transistor is selected Si2302 for use; first diode is selected 1N5817 for use; second diode is selected 1N4148 for use; step-down driven management IC selects S-8520 for use; li-ion cell protection IC selects S8241 for use, and first; second electric capacity is selected 100 μ/10V for use, and the 3rd electric capacity is selected 0.1 μ for use; first inductance is selected 22 μ H for use; first resistance is selected 470 Ω, second for use; the 3rd resistance is selected 1K for use, and the 4th resistance is selected 1K for use; the 5th resistance is selected 55K for use; the 6th resistance is selected NTC10K for use, and the 7th resistance is selected 7.5K for use, and the 9th resistance is selected 0.25 Ω for use; the tenth resistance is selected 10K for use, and the 11 resistance is selected 100K for use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510036050 CN1725927A (en) | 2005-07-15 | 2005-07-15 | LED chip drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510036050 CN1725927A (en) | 2005-07-15 | 2005-07-15 | LED chip drive circuit |
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| Publication Number | Publication Date |
|---|---|
| CN1725927A true CN1725927A (en) | 2006-01-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510036050 Pending CN1725927A (en) | 2005-07-15 | 2005-07-15 | LED chip drive circuit |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102469655A (en) * | 2010-11-11 | 2012-05-23 | 海洋王照明科技股份有限公司 | Light-emitting diode (LED) driving circuit |
| CN102685971A (en) * | 2011-03-08 | 2012-09-19 | 登丰微电子股份有限公司 | Conversion controller |
| TWI384171B (en) * | 2010-01-05 | 2013-02-01 | Richtek Technology Corp | Thermal foldback control for a light-emitting diode |
| CN103090201A (en) * | 2013-01-29 | 2013-05-08 | 上海市电力公司 | Multifunctional light-emitting diode (LED) strong light type object expelling emergency lighting flashlight |
| WO2014075341A1 (en) * | 2012-11-14 | 2014-05-22 | 深圳市华星光电技术有限公司 | Method for solving overtemperature of constant current drive chips and led lamp strip drive circuit |
| CN107006089A (en) * | 2014-11-07 | 2017-08-01 | 飞利浦照明控股有限公司 | Actuator device and the driving method for driving load |
| CN108963973A (en) * | 2018-06-30 | 2018-12-07 | 深圳市必拓电子股份有限公司 | A kind of thermal-shutdown circuit and mould group |
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2005
- 2005-07-15 CN CN 200510036050 patent/CN1725927A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI384171B (en) * | 2010-01-05 | 2013-02-01 | Richtek Technology Corp | Thermal foldback control for a light-emitting diode |
| CN102469655A (en) * | 2010-11-11 | 2012-05-23 | 海洋王照明科技股份有限公司 | Light-emitting diode (LED) driving circuit |
| CN102469655B (en) * | 2010-11-11 | 2014-10-01 | 海洋王照明科技股份有限公司 | Light-emitting diode (LED) driving circuit |
| CN102685971A (en) * | 2011-03-08 | 2012-09-19 | 登丰微电子股份有限公司 | Conversion controller |
| CN102685971B (en) * | 2011-03-08 | 2014-08-20 | 登丰微电子股份有限公司 | Conversion controller |
| US9035557B2 (en) | 2011-03-08 | 2015-05-19 | Green Solution Technology Co., Ltd. | Converting controller |
| WO2014075341A1 (en) * | 2012-11-14 | 2014-05-22 | 深圳市华星光电技术有限公司 | Method for solving overtemperature of constant current drive chips and led lamp strip drive circuit |
| CN103090201A (en) * | 2013-01-29 | 2013-05-08 | 上海市电力公司 | Multifunctional light-emitting diode (LED) strong light type object expelling emergency lighting flashlight |
| CN107006089A (en) * | 2014-11-07 | 2017-08-01 | 飞利浦照明控股有限公司 | Actuator device and the driving method for driving load |
| CN108963973A (en) * | 2018-06-30 | 2018-12-07 | 深圳市必拓电子股份有限公司 | A kind of thermal-shutdown circuit and mould group |
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