CN103269541B - A kind of LED constant current controller of integrated three kinds of output current specifications - Google Patents
A kind of LED constant current controller of integrated three kinds of output current specifications Download PDFInfo
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Abstract
The invention provides a kind of LED constant current controller of integrated three kinds of output current specifications, do you utilize PWM? the flexibility of LED driver special chip, add resistance R12, R13, R14 and 2 toggle switchs, R13, R14 are connected in series two triodes Q10, Q11 respectively, the grounded emitter of Q10, Q11, base stage is connected with a switch in 2 toggle switchs respectively by resistance R15, R16; At described 2 toggle switchs and described between resistance R15, R16, respectively parallel access resistance R25, R26, described resistance R25, R26 connect the base stage of triode Q20, Q21 respectively, and the collector electrode of Q20, Q21 is connected with the LED constant current controller of the integrated three kinds of output current specifications in another road.The present invention can not only can select arbitrarily wherein a kind of output current specification by use 2 toggle switchs, multiple constant current output can also be applicable to Multi-path synchronous output products.
Description
Technical field
The invention belongs to technical field of LED illumination, particularly relate to the LED constant current controller that a kind of integrated multiple electric current exports specification.
Background technology
The output of traditional LED constant current controller product mainly contains 350mA, 700mA and 1050mA tri-kinds of output current specifications.In prior art, use PWM LED driver special chip, this special chip drives external power field effect transistor (MOSFET) with fixed frequency, this frequency is determined by biasing resistor (RF) value be serially connected between described special chip frequency leading foot (F) and ground, its output current value is determined by foreign current sample resistance (R11) value that is serially connected between the source electrode of external power field effect transistor (MOSFET) and ground, and the Voltage Feedback of described foreign current sample resistance (R11) is to the test pin (TEST) of described special chip; The output pin (OUT) of described special chip is connected with the grid of described external power field effect transistor (MOSFET), when the voltage of described test pin (TEST) exceedes the set threshold voltage of the peak current comparator being positioned at described special chip inside, the drive singal of described special chip output pin (OUT) terminates, and described external power field effect transistor (MOSFET) turns off.
In the prior art, because sample resistance resistance is very little, than the contact resistance of switch or the switch resistance of triode or metal-oxide-semiconductor all little or similar, the switch resistance of the contact resistance of such switch or triode or metal-oxide-semiconductor has influence on the effective resistance of final reality, and different continuous currents can only be realized by the resistance adjusting sampling resistor, cannot
betterground realizes exporting different size electric current
simultaneouslyrealize the function of multi-channel control.
Summary of the invention
The invention provides a kind of LED constant current controller of integrated three kinds of output current specifications, be intended to solve Problems existing in background technology, multiple constant current Synchronization Control can also be realized easily.The technical solution used in the present invention is:
A kind of LED constant current controller of integrated three kinds of output current specifications, it is characterized in that: it comprises PWMLED driver special chip, this special chip drives external power field effect transistor (MOSFET) with fixed frequency, this frequency is determined by biasing resistor (RF) value be serially connected between described special chip frequency leading foot (F) and ground, its output current value is determined by foreign current sample resistance (R11) value be serially connected between the source electrode of external power field effect transistor (MOSFET) and ground, the Voltage Feedback of described foreign current sample resistance (R11) is to the test pin (TEST) of described special chip, the output pin (OUT) of described special chip is connected with the grid of described external power field effect transistor (MOSFET), when the voltage of described test pin (TEST) exceedes the set threshold voltage of the peak current comparator being positioned at described special chip inside, the drive singal of described special chip output pin (OUT) terminates, and described external power field effect transistor (MOSFET) turns off, series connection one divider resistance (R12) between described external power field effect transistor (MOSFET) and described test pin (TEST), in parallelly between described divider resistance (R12) with described test pin (TEST) access other two divider resistances (R13, R14), described two divider resistance (R13, R14) two triode (Q10 are connected in series respectively, Q11), described triode (Q10, Q11) grounded emitter, base stage is connected with a switch in 2 toggle switchs respectively by resistance R15, R16, and described 2 other two ends of toggle switch connect the positive pole of stabilized voltage power supply respectively, at described 2 toggle switchs and described between resistance R15, R16, access resistance R25, R26 in parallel respectively, described resistance R25, R26 connect the base stage of triode Q20, Q21 respectively, the grounded emitter of triode Q20, Q21, the LED constant current controller of integrated three kinds of output current specifications that collector electrode is identical with another road is connected, the resistance of described current sampling resistor (R11) is 0.68 Ω ± 1%, other two the resistance (R13 accessed in parallel between the resistance (R12) added between described external power field effect transistor (MOSFET) with described test pin (TEST), described resistance (R12) with described test pin (TEST), R14) be the paster fixed carbon resister of 1% precision, resistance is 1.0k Ω ± 1%.
The LED constant current controller of described integrated three kinds of output current specifications, is characterized in that, described stabilized voltage power supply is 5 volts.
The LED constant current controller of described integrated three kinds of output current specifications, is characterized in that, the resistance of described current sampling resistor (R11) is 0.68 Ω.
The LED constant current controller of described integrated three kinds of output current specifications, is characterized in that, the threshold voltage of described peak current comparator is 240mV at inner setting.
Traditional three kinds of output current specifications (350mA, 700mA and 1050mA) can be integrated in a product by the present invention, can select arbitrarily wherein a kind of output current specification by using 2 toggle switchs.Meanwhile, this LED constant current controller is also applicable to the three-in-one constant-current controller of other current specification, multiple constant current output can also be applicable to multiple-channel output product.
Accompanying drawing explanation
Fig. 1 is single channel constant-current circuit schematic diagram of the present invention;
Fig. 2 is two-way constant-current circuit schematic diagram 1 of the present invention;
Fig. 3 is two-way constant-current circuit schematic diagram 2 of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
In single channel constant-current circuit as shown in Figure 1, this circuit with PWM LED driver special chip HV9910B for core, this chip drives external power field effect transistor (MOSFET) with the fixed frequency up to 300KHz, its frequency is determined by biasing resistor RF value, and its output current value is determined by foreign current sample resistance R11 value.Its output current value is determined by foreign current sample resistance (R11) value that is serially connected between the source electrode of external power field effect transistor (MOSFET) and ground, and the Voltage Feedback of foreign current sample resistance (R11) is to the test pin (TEST) of special chip HV9910B; The output pin (OUT) of described special chip is connected with the grid of described external power field effect transistor (MOSFET), when the voltage of described test pin (TEST) exceedes the set threshold voltage of the peak current comparator being positioned at described special chip inside, the drive singal of described special chip output pin (OUT) terminates, and described external power field effect transistor (MOSFET) turns off; Divider resistance (R12) is added between described external power field effect transistor (MOSFET) and described test pin (TEST), in parallelly between described electric resistance partial pressure (R12) with described test pin (TEST) access other two divider resistance (R13, R14), described two divider resistance (R13, R14) ground connection after contacting with a switch (ON:1, ON:2) in 2 toggle switchs respectively.
The resistance of described current sampling resistor (R11) is 0.68 Ω ± 1%; Other two the resistance (R13 accessed in parallel between the resistance (R12) added between described external power field effect transistor (MOSFET) with described test pin (TEST), described resistance (R12) with described test pin (TEST), R14) be the paster fixed carbon resister of 1% precision, resistance is 1.0k Ω ± 1%.When ON:1 and ON:2 disconnects, the current conversion that R11 sampling resistor is sampled becomes voltage all to feed back to the TEST pin of special chip, the load current obtained: I
load=Vcs/R11=0.24V/0.68 Ω=350mA.When ON:1 conducting ON:2 turns off, the current conversion that R11 sampling resistor is sampled becomes voltage first by feeding back to the TEST pin of special chip after R12 and R13 dividing potential drop again, and voltage ratio is 2:1, and the load current obtained is 700mA.When ON:1 and ON:2 all conducting time, the current conversion that R11 sampling resistor is sampled becomes voltage first by feeding back to the TEST pin of special chip after R12 and R13/R14 dividing potential drop in parallel again, and voltage ratio is 3:1, and the load current obtained is 1050mA.
Change the value of resistance R11, can obtain the output current of other specifications, such as change R11 into 0.6 Ω, can obtain 400mA, 800mA, 1200mA tri-kinds of electric currents export.
When needs multiple constant current exports, above-mentioned single channel constant-current circuit basis adds a point controlled switch circuit, as shown in Figure 2 and Figure 3.Fig. 2, Fig. 3 form a two-way constant current output circuit jointly, and wherein, SW1 and the SW2 signal in Fig. 3 is from toggle switch ON:1 and ON:2 in Fig. 2.This point of controlled switch circuit circuit uses 2 toggle switchs and 2 groups of transistor circuits to realize disconnection or the Closed control of 2 component piezoresistances, concrete method of attachment is: at described two divider resistance (R13, R14) two triode (Q10 are connected in series respectively, Q11), described triode (Q10, Q11) grounded emitter, base stage is connected with a switch in 2 toggle switchs respectively by resistance R15, R16, and described 2 toggle switchs connect the positive pole of 5 volts of stabilized voltage power supplys respectively; At described 2 toggle switchs and described between resistance R15, R16, respectively parallel access resistance R25, R26, described resistance R25, R26 connect the base stage of triode Q20, Q21 respectively, the grounded emitter of triode Q20, Q21, the LED constant current controller of integrated three kinds of output current specifications that collector electrode is identical with another road is connected.
When ON:1 and ON:2 disconnects, Q10, Q11, Q20, Q21 disconnect, and two-way exports and all works by 350mA; When ON:1 conducting ON:2 disconnects, Q11, Q21 conducting, Q10, Q20 disconnect, and two-way exports and all works by 700mA; When ON:1 and ON:2 all conducting time, Q10, Q11, Q20, Q21 conducting, two-way export all work by 1050mA.
Thus, the LED constant current controller of these integrated three kinds of output current specifications can realize three kinds of constant current output specifications and select arbitrarily, and constant current output way easily extensible is any multichannel, realizes multiple constant current output and carries out Synchronization Control, therefore can reduce production cost, be user-friendly to.
Claims (4)
1. the LED constant current controller of integrated three kinds of output current specifications, it is characterized in that: it comprises PWM LED driver special chip, this special chip drives external power field effect transistor (MOSFET) with fixed frequency, this frequency is determined by biasing resistor (RF) value be serially connected between described special chip frequency leading foot (F) and ground, its output current value is determined by foreign current sample resistance (R11) value be serially connected between the source electrode of external power field effect transistor (MOSFET) and ground, the Voltage Feedback of described foreign current sample resistance (R11) is to the test pin (TEST) of described special chip, the output pin (OUT) of described special chip is connected with the grid of described external power field effect transistor (MOSFET), when the voltage of described test pin (TEST) exceedes the set threshold voltage of the peak current comparator being positioned at described special chip inside, the drive singal of described special chip output pin (OUT) terminates, and described external power field effect transistor (MOSFET) turns off, series connection one divider resistance (R12) between described external power field effect transistor (MOSFET) and described test pin (TEST), in parallelly between described divider resistance (R12) with described test pin (TEST) access other two divider resistances (R13, R14), described two divider resistance (R13, R14) two triode (Q10 are connected in series respectively, Q11), described triode (Q10, Q11) grounded emitter, base stage is connected with a switch in 2 toggle switchs respectively by resistance R15, R16, and described 2 other two ends of toggle switch connect the positive pole of stabilized voltage power supply respectively, at described 2 toggle switchs and described between resistance R15, R16, access resistance R25, R26 in parallel respectively, described resistance R25, R26 connect the base stage of triode Q20, Q21 respectively, the grounded emitter of triode Q20, Q21, the LED constant current controller of integrated three kinds of output current specifications that collector electrode is identical with another road is connected, the resistance of described current sampling resistor (R11) is 0.68 Ω ± 1%, other two the resistance (R13 accessed in parallel between the resistance (R12) added between described external power field effect transistor (MOSFET) with described test pin (TEST), described resistance (R12) with described test pin (TEST), R14) be the paster fixed carbon resister of 1% precision, resistance is 1.0k Ω ± 1%.
2. the LED constant current controller of integrated three kinds of output current specifications according to claim 1, is characterized in that, described stabilized voltage power supply is 5 volts.
3. the LED constant current controller of integrated three kinds of output current specifications according to claim 1, is characterized in that, the resistance of described current sampling resistor (R11) is 0.68 Ω.
4. the LED constant current controller of the integrated three kinds of output current specifications any one of claims 1 to 3 described in claim, is characterized in that, the threshold voltage of described peak current comparator is 240mV at inner setting.
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| CN103648216B (en) * | 2013-12-06 | 2015-12-09 | 武汉精立电子技术有限公司 | A kind of Intelligent constant flow drives the method for great power LED |
| CN107466133A (en) * | 2017-08-28 | 2017-12-12 | 盐城莱廷绍工业技术有限公司 | A kind of multistage exports LED drive device |
| CN107426878B (en) * | 2017-08-28 | 2019-07-02 | 盐城莱廷绍工业技术有限公司 | A kind of driving circuit for selecting LED to export electric current by jack |
| CN107479607A (en) * | 2017-08-31 | 2017-12-15 | 赛尔富电子有限公司 | A kind of current sample change-over circuit and LED constant current power supply |
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