CN102256417A - Light-emitting diode (LED) lamp controller based on digital pulse-width modulation (PWM) control technology - Google Patents
Light-emitting diode (LED) lamp controller based on digital pulse-width modulation (PWM) control technology Download PDFInfo
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Abstract
The invention discloses a light-emitting diode (LED) lamp controller based on a digital pulse-width modulation (PWM) control technology. The LED lamp controller comprises a power management module, a direct current-direct current (DC-DC) convertor, a constant current control circuit which corresponds to one or more sets of LED lamp strings one to one, and a control module, wherein the input end of the power management module receives a power voltage signal input from the outside; the control module receives a PWM signal input from the outside; the input end of the DC-DC convertor is electrically connected with the output end of the power management module; the output end of the DC-DC convertor is electrically connected with one end of the one set of LED lamp string or of each of the multiple sets of LED lamp strings; the control module is electrically connected with the control end of the DC-DC convertor and the input end of the constant current control circuit; and the output end of the constant current control circuit is electrically connected with the other end of the one set of LED lamp string or of each of the multiple sets of LED lamp strings. A combined circuit formed by basic components is used for controlling a signal set of LED lamp string, and multiple sets of LED lamp strings which are parallelly connected with one another; and the LED lamp controller has the characteristics of low cost and flexile control.
Description
Technical field
The present invention relates to the LED lamp control device, relate in particular to a kind of LED lamp controller based on the digital PWM control technology.
Background technology
High brightness diode (High Brightness Lighting Emitted Diode) has obtained in the automotive lighting field using widely because of it has the high and low power consumption of light conversion efficiency, low in calories, characteristics such as startup is fast, life-span length.The daytime running lamps of a lot of automobiles are employed to be exactly the high brightness diode.
Current, what the automobile-used LED lamp controller adopted usually is application-specific integrated circuit (ASIC), and its structure roughly as shown in Figure 8.The input of power management module 91 receives the power supply voltage signal that is sent by car body control module 100, and output and LED lamp controller 9 interior LED control chips 92 are connected.LED control chip 92 is transformed into LED lamp string 200 needed voltages with cell voltage, and control LED lamp string 200 carries out work according to the mode of constant current, its inner integrated circuit generally adopts buck-boost or sepic circuit to be used for lifting voltage, receives the dim signal that single-chip microcomputer 93 sends simultaneously and comes light modulation.The pwm signal that single-chip microcomputer 93 receives by car body control module 100 outputs.Yet, because the combination of the LED lamp string that daytime running lamps use is more, the accuracy requirement of light modulation is higher, the area requirement of output current and power is also more and more wideer, also exist the series-parallel demand of LED lamp, also do not have a kind of application-specific integrated circuit (ASIC) of the LED of employing control chip can satisfy above-mentioned requirements at present.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of LED lamp controller based on PWM control, mainly select for use the combinational circuit that constitutes by basic components and parts to control single group or many groups LED lamp string parallel with one another, it is low to have cost, the control flexible characteristic, can be applicable to multiple LED lamp combining structure, and the output current precision height of this LED lamp controller, output voltage range is wide.
The technical solution adopted in the present invention is: a kind of LED lamp controller based on the digital PWM control technology, be used to control one group of LED lamp string or many groups LED lamp string parallel with one another, and this LED lamp controller comprises power management module and control module; The input of described power management module receives from the power supply voltage signal of outside input; Described control module receives from the pwm signal of outside input; It is characterized in that,
This LED lamp controller also comprises a DC-DC converter and with described one group of LED lamp string or organize LED lamp string one or more groups constant-current control circuit one to one more;
The input of described DC-DC converter is electrically connected with the output of described power management module, and output and described one group of LED lamp string or an end of organizing LED lamp string are electrically connected more;
Described control module is electrically connected with the control end of DC-DC converter and the input of described one or more groups constant-current control circuit respectively; The output of described one or more groups constant-current control circuit and described one group of LED lamp string or the other end of organizing LED lamp string are electrically connected more; This control module is according to the pwm signal from the outside input, and the voltage at detected LED lamp string two ends and the operating current that flows through every group of LED lamp string, export the pwm signal of corresponding duty ratio to described DC-DC converter and with every group of corresponding constant-current control circuit of LED lamp string, and control the unlatching or the disconnection of LED lamp string operating current.
The present invention has the following advantages:
1. the present invention is combined by basic components and parts, and can according to the quantity of LED lamp string in parallel increase or reduce the quantity of constant current control module, therefore more flexible than the mode that existing employing LED control chip is controlled, cost is also lower;
2. after tested, LED lamp controller of the present invention is compared with the existing mode that adopts the LED control chip to control, and the current precision of exporting to LED lamp string is higher, and output voltage range is wideer;
3. adopt LED lamp controller of the present invention, can control many group LED lamp strings simultaneously, the light signal of output is also more stable than existing LED lamp controller.
Description of drawings
Concrete structure of the present invention is further described by following embodiment and accompanying drawing thereof.
Fig. 1 is the circuit block diagram of led controller according to an embodiment of the present invention.
Fig. 2 is the circuit block diagram of power management module according to an embodiment of the invention.
Fig. 3 is the circuit block diagram of pwm signal detecting unit according to an embodiment of the invention.
Fig. 4 is the circuit block diagram of CPU according to an embodiment of the invention.
Fig. 5 is the circuit topological structure figure according to the led controller of first embodiment of the invention.
Fig. 6 is the circuit block diagram of constant-current control circuit according to an embodiment of the invention.
Fig. 7 is the circuit topological structure figure according to the led controller of second embodiment of the invention.
Fig. 8 is the schematic block circuit diagram of existing led controller.
Embodiment
Below in conjunction with accompanying drawing the present invention is made and to further specify.
As shown in Figure 1, LED lamp controller of the present invention comprise power management module 1, a DC-DC converter 2, with one group of LED lamp string or organize LED lamp string one or more groups constant-current control circuit 3 and control module 4 one to one more.The input of power management module 1 receives from the power supply voltage signal of outside input, and output is electrically connected with the input of DC-DC converter 2, and the output of DC-DC converter 2 and one group of LED lamp string or an end of organizing LED lamp string 200 are electrically connected more.DC-DC converter 2 is used for input voltage is converted to the required operating voltage of LED lamp string.
The structure of power management module 1 is identical with existing power management module 91, and it comprises reverse-connection preventing circuit 11 and the filter circuit 12 that prevents the input voltage reversal connection.The input of reverse-connection preventing circuit 11 receives from the power supply voltage signal of outside input, and output is electrically connected with the input of filter circuit 12, and the output of filter circuit 12 is electrically connected with the input of DC-DC converter 2, as shown in Figure 2.In one embodiment, reverse-connection preventing circuit 11 can be made of a diode.
Control module 4 receives from the pwm signal of outside input, and this control module 4 is electrically connected with the control end of DC-DC converter 2 and the input of described one or more groups constant-current control circuit 3 respectively.The output of this one or more groups constant-current control circuit 3 and one group of LED lamp string or the other end of organizing LED lamp string are electrically connected more.Constant-current control circuit 3 is used for the electric current that control flows is crossed LED lamp string.
In a specific embodiment of the present invention, can export by the power supply voltage signal output and the pwm signal output of car body control module 100 respectively from the power supply voltage signal and the pwm signal of outside input; At this moment, the input of reverse-connection preventing circuit 11 is electrically connected with the power supply voltage signal output of car body control module 100.
Control module 4 comprise a pwm signal detecting unit 41, a LED lamp string parameter detecting unit 42, a memory cell 43, one first pwm signal output unit 44, with the one or more one to one second pwm signal output units 45 of described one or more groups constant-current control circuit 3, with one or more one to one current switching signal output units 46 of one or more groups constant-current control circuit 3 and a CPU 47.Wherein:
Pwm signal detecting unit 41 is used to detect the pwm signal of car body control module 100 inputs, and testing result is sent to CPU 47.As shown in Figure 3, this pwm signal detecting unit 41 comprises a comparator 411, an A/D change-over circuit 412 and a computation subunit 413, and the output of comparator 411 and A/D change-over circuit 412 all is electrically connected with the signal input part of this computation subunit 413.Comparator 411 is provided with high threshold voltage and a low threshold voltage.Comparator output high level when the PWM applied signal voltage from car body control module 100 inputs is higher than high threshold voltage, comparator output low level when the PWM applied signal voltage from car body control module 100 inputs is lower than low threshold voltage.Computation subunit 413 is calculated the frequency and the duty ratio of PWM input signal by calculating high level and low level duration.Because comparator 411 can only just be triggered when voltage is crossed thresholding, may cause the judgement of 0% and 100% duty ratio was lost efficacy, so the A/D change-over circuit carries out the A/D conversion to the pwm signal from car body control module 100 inputs simultaneously, if the corresponding PWM applied signal voltage value of A/D conversion continues greater than 5V, then computation subunit 413 judges that the duty ratio of pwm signal is 100%, if the corresponding PWM applied signal voltage value of A/D conversion continues less than 4V, then computation subunit 413 judges that the duty ratio of pwm signal is 0%;
LED lamp string parameter detecting unit 42 is used to gather the magnitude of voltage detection signal at LED lamp string two ends and the working current value detection signal of every group of LED lamp string, and deposits testing result in memory cell 43; As shown in Fig. 5 and Fig. 7, LED lamp string parameter detecting unit 42 is determined the operating state of LED lamp string by voltage Vdrla, the Vdrlk of LED lamp string negative pole end of sampling LED lamp string positive terminal;
The first pwm signal output unit 44 is to DC-DC converter 2 output pwm signals; The second pwm signal output unit 45 is to pairing constant-current control circuit 3 output pwm signals; Current switching signal output unit 46 is to pairing constant-current control circuit 3 output current start signal or failure of current signal, with the unlatching or the disconnection of control LED lamp string operating current;
As shown in Figure 4, this CPU 47 further comprises power control sub unit 471, duty ratio computation subunit 472 and brightness regulation subelement 473.Wherein, power control sub unit 471 is detected by LED lamp string parameter detecting unit 42, and be stored in the magnitude of voltage testing result at the LED lamp string two ends in the memory cell 43 and the working current value testing result of every group of LED lamp string is calculated the gross power that outputs to all LED lamp strings, when the gross power that outputs to LED lamp string surpass one be stored in this power control sub unit 471 predefined higher limit (such as 20W) time, the electric current that the duty ratio of the pwm signal of power control sub unit 471 by reducing 44 outputs of the first pwm signal output unit outputs to LED lamp string with reduction limits gross power and gets back to below the predefined higher limit.Duty ratio computation subunit 472 is controlled the duty ratio of the pwm signal of each second pwm signal output unit, 45 output according to pwm signal detecting unit 41 detected pwm signals and the assigned work current value that is stored in every group of LED lamp string in the memory cell 43.Brightness regulation subelement 473 is controlled the output of the first pwm signal output unit 44 and current switching signal output unit 46 according to pwm signal detecting unit 41 detected pwm signals, realizes the output light modulation.
In one embodiment of the invention, the present invention also comprises bleeder circuit 5 and voltage sample circuit 6.The input of bleeder circuit 5 is electrically connected with the power supply voltage signal output of car body control module 100, receives from the power supply voltage signal of outside input, and output is electrically connected with LED lamp string parameter detecting unit 42; This bleeder circuit 5 is used for supply voltage is converted to the required supply voltage size of LED lamp string parameter detecting unit 42, for LED lamp string parameter detecting unit 42 provides power supply.The input of voltage sample circuit 6 is electrically connected with the pwm signal output of car body control module 100, reception is from the pwm signal of outside input, output is electrically connected with the input of pwm signal detecting unit 41, be used for pwm signal magnitude of voltage size, convert the magnitude of voltage that pwm signal detecting unit 41 can bear to car body control module 100 outputs.
Fig. 5 shows a specific embodiment of the present invention, and in this embodiment, the quantity of LED lamp string is one group.As shown in the figure, DC-DC converter 2 is the inverse-excitation type DC converter.This inverse-excitation type DC-DC converter comprises a transformer T1, a NMOS pipe N1 and a NMOS tube drive circuit 21.One end of the first siding ring of transformer T1 is electrically connected with an end of the output of power management module 1, and the other end is electrically connected with the drain D of NMOS pipe N1; One end of the second siding ring of this transformer T1 is connected with the positive electrical of diode D1, and the other end is connected with the negative electricity of this diode D1 by a capacitor C 3, and the negative pole of diode D1 is electrically connected with the positive terminal of LED lamp string 200.The input of NMOS tube drive circuit 21 is electrically connected with the first pwm signal output unit 44, and output is electrically connected with the grid G of NMOS pipe N1; The source S of this NMOS pipe N1 is electrically connected with the other end of the output of power management module 1.
Fig. 6 shows the circuit block diagram of constant-current control circuit 3 according to an embodiment of the invention.Constant-current control circuit 3 comprises filter circuit 31, comparator 32, power driving circuit 33, switching circuit 34, first current-limiting circuit 35, second current-limiting circuit 36 and current sampling circuit 37.The input of filter circuit 31 is electrically connected with the pairing second pwm signal output unit 45, and output is electrically connected with the first input end of comparator 32; Second input of comparator 32 is electrically connected with the output of first current-limiting circuit 35, the input of first current-limiting circuit 35 is electrically connected with pairing current switching signal output unit 46, the output of this comparator 32 is electrically connected with the input of power driving circuit 33, and the output of power driving circuit 33 is electrically connected with the input of switching circuit 34; First output of this switching circuit 34 is electrically connected with the negative pole end of LED lamp string 200, second output of this switching circuit is electrically connected with the input of second current-limiting circuit 36, the output of second current-limiting circuit 36 is electrically connected with second input of comparator 32, and second output of this switching circuit also is electrically connected with current sampling circuit 37.
In the embodiment shown in fig. 5, switching circuit 34 mainly is made of NMOS pipe N2, power driving circuit 33 is an OTL power amplification circuit, comparator 32 mainly is made of operational amplifier U1, first current-limiting circuit 35 is made up of the first current-limiting resistance R1, second current-limiting circuit is made up of the second current-limiting resistance R2, and current sampling circuit 37 is made up of current sampling resistor R3.The drain D of NMOS pipe N2 is electrically connected with the negative pole end of LED lamp string 200, and source S is electrically connected with the end of oppisite phase of operational amplifier U1 by the second current-limiting resistance R2, and this source S is also passed through current sampling resistor R3 ground connection, and is electrically connected with LED lamp string parameter detecting unit 42.This OTL power amplification circuit comprises a NPN triode Q1 and a PNP triode Q2.The base stage of NPN triode Q1 is electrically connected with the base stage of PNP triode Q2, and collector electrode is electrically connected with a 8V power supply, and emitter is electrically connected with the emitter of PNP triode Q2.The collector electrode of PNP triode Q2 is electrically connected with the source electrode of NMOS pipe N2.The base stage of this NPN triode is electrically connected with the output of operational amplifier U1 with the common contact of the base stage of PNP triode, and the emitter of this NPN triode is electrically connected with the grid G of NMOS pipe with the common contact of the emitter of PNP triode.
The fixed duty signal that the second pwm signal output unit 45 produces generates the positive terminal that stable voltage outputs to operational amplifier U1 by filter circuit 31, and this voltage is used for determining the electric current of constant-current control circuit.The computing formula of LED lamp string stream is
Be the voltage of operational amplifier U1 positive terminal, it is by the driving voltage and the output duty cycle decision of the second pwm signal output unit 45.
。In the following formula,
It is the driving voltage of the second pwm signal output unit 45.
It is the output duty cycle of the second pwm signal output unit 45.Single-chip microcomputer is by the switch of current switching signal output unit 46 control constant-current control circuits.When current switching signal output unit 46 is set to export high level, constant-current control circuit is closed, at this moment, the electric current that flows through NMOS pipe N2 is zero, wherein, the first current-limiting resistance R1 preferably much smaller than the resistance of the second current-limiting resistance R2, can close constant-current control circuit to guarantee current switching signal output unit 46 reliably; In one embodiment, R1/R2 is smaller or equal to 1/50.When current switching signal output unit 46 was set to input state (high-impedance state), constant-current control circuit was opened, and the electric current (also being the electric current of LED lamp string) that flows through NMOS pipe N2 this moment is
Waveform during for the ripple of controlling LED lamp string 200 and switch, a capacitor C 1 has been connected in parallel at the two ends of LED lamp string 200.
The course of work of this LED lamp controller is as follows: after the LED lamp controller starts, CPU 47 is by the first pwm signal output unit, 44 control DC-DC converters 2, output voltage is risen, simultaneously, set the assigned work current value of the LED lamp string of current value corresponding stored in memory cell of LED lamp string by the second pwm signal output unit 45.After the electric current that outputs to LED lamp string reached set point, this LED lamp controller changed the operation phase over to.Be operated in constant current state at operation phase LED lamp string.
The output light modulation process of this LED lamp controller is as follows: in the operation phase, the switch that outputs to the electric current of LED lamp string is realized by CPU 47 control first pwm signal output units 44 and current switching signal output unit 46.When forbidding the first pwm signal output unit and output cut-off signals to current switching signal output unit 46, the electric current of LED lamp string is 0; When allowing the first pwm signal output unit 44 and output to open signal to current switching signal output unit 46, the electric current of LED lamp string is a set point.By switching the switch of the first pwm signal output unit 45 and the switch of current switching signal output unit 46 with the frequency of 250Hz, and set the duty ratio of corresponding input pwm signal, system can realize exporting light modulation, promptly exports the adjusting of brightness.
Fig. 7 shows the second embodiment of the present invention.The main distinction of the second embodiment of the present invention and first embodiment is, the LED lamp controller be provided with two groups of LED lamp strings 200 parallel with one another and with these two groups of LED lamp strings two groups of constant-current control circuits 3 one to one.In controller 4, be provided with and corresponding one by one two the second pwm signal output units 45 of these two groups of constant-current control circuits 3 and two current switching signal output units 46.LED lamp string parameter detecting unit 42 is gathered the magnitude of voltage detection signal at LED lamp string two ends and the working current value detection signal of every group of LED lamp string, and deposits testing result in memory cell 43.Fig. 7 only shows two groups of LED lamp strings parallel with one another, and the quantity of lamp string can also increase according to actual needs, as LED lamp strings such as three groups, four groups parallel with one another.
It is low that the present invention has a cost, and the control flexible characteristic can be applicable to multiple LED lamp combining structure, and the output current precision height of this LED lamp controller, and output voltage range is wide.
Claims (10)
1. the LED lamp controller based on the digital PWM control technology is used to control one group of LED lamp string or many groups LED lamp string parallel with one another, and this LED lamp controller comprises power management module and control module; The input of described power management module receives from the power supply voltage signal of outside input; Described control module receives from the pwm signal of outside input; It is characterized in that,
This LED lamp controller also comprises a DC-DC converter and with described one group of LED lamp string or organize LED lamp string one or more groups constant-current control circuit one to one more;
The input of described DC-DC converter is electrically connected with the output of described power management module, and output and described one group of LED lamp string or an end of organizing LED lamp string are electrically connected more;
Described control module is electrically connected with the control end of DC-DC converter and the input of described one or more groups constant-current control circuit respectively; The output of described one or more groups constant-current control circuit and described one group of LED lamp string or the other end of organizing LED lamp string are electrically connected more; This control module is according to the pwm signal from the outside input, and the voltage at detected LED lamp string two ends and the operating current that flows through every group of LED lamp string, export the pwm signal of corresponding duty ratio to described DC-DC converter and with every group of corresponding constant-current control circuit of LED lamp string, and control the unlatching or the disconnection of LED lamp string operating current.
2. a kind of LED lamp controller according to claim 1 based on the digital PWM control technology, it is characterized in that, described control module comprise a pwm signal detecting unit, a LED lamp string parameter detecting unit, a memory cell, one first pwm signal output unit, with the one or more one to one second pwm signal output units of described one or more groups constant-current control circuit, with one or more one to one current switching signal output units of described one or more groups constant-current control circuit and a CPU; Wherein:
The pwm signal detecting unit is used to detect the outside pwm signal of importing, and testing result is sent to described CPU;
LED lamp string parameter detecting unit is used to gather the magnitude of voltage detection signal at LED lamp string two ends and the working current value detection signal of every group of LED lamp string, and deposits testing result in described memory cell;
The first pwm signal output unit is to described DC-DC converter output pwm signal;
The second pwm signal output unit is to pairing constant-current control circuit output pwm signal;
The current switching signal output unit is to pairing constant-current control circuit output current start signal or failure of current signal, with the unlatching or the disconnection of control LED lamp string operating current;
CPU, according to the detected pwm signal of described pwm signal detecting unit and be stored in the magnitude of voltage testing result at the LED lamp string two ends in the described memory cell and the working current value testing result of every group of LED lamp string, control the described first pwm signal output unit is exported pwm signal from corresponding duty ratio to described DC-DC converter; According to detected pwm signal of described pwm signal detecting unit and the assigned work current value that is stored in every group of LED lamp string in the described memory cell, each second pwm signal output unit of control sends the pwm signal of corresponding duty ratio to corresponding constant-current control circuit respectively; According to the detected pwm signal of pwm signal detecting unit, control the output of each current switching signal output unit.
3. a kind of LED lamp controller based on the digital PWM control technology according to claim 2 is characterized in that described CPU comprises:
The power control sub unit, detected and be stored in the magnitude of voltage testing result at the LED lamp string two ends in the described memory cell and the working current value testing result of every group of LED lamp string is calculated the gross power that outputs to all LED lamp strings by described LED lamp string parameter detecting unit, when the gross power that outputs to LED lamp string surpassed the predefined higher limit that is stored in this power control sub unit, this power control sub unit reduced the duty ratio of the pwm signal of first pwm signal output unit output;
The duty ratio computation subunit according to detected pwm signal of described pwm signal detecting unit and the assigned work current value that is stored in every group of LED lamp string in the memory cell, is controlled the duty ratio of the pwm signal of each second pwm signal output unit output;
The brightness regulation subelement according to the detected pwm signal of described pwm signal detecting unit, is controlled the output of described first pwm signal output unit and described current switching signal output unit.
4. a kind of LED lamp controller according to claim 2 based on the digital PWM control technology, it is characterized in that described constant-current control circuit comprises filter circuit, comparator, power driving circuit, switching circuit, first current-limiting circuit, second current-limiting circuit and current sampling circuit;
The input of described filter circuit is electrically connected with the pairing second pwm signal output unit, and output is electrically connected with the first input end of described comparator; Second input of described comparator is electrically connected with the output of described first current-limiting circuit, the input of first current-limiting circuit is electrically connected with pairing current switching signal output unit, the output of this comparator is electrically connected with the input of described power driving circuit, and the output of described power driving circuit is electrically connected with the input of described switching circuit; First output of this switching circuit is electrically connected with the negative pole end of pairing that group LED lamp string, second output of this switching circuit is electrically connected with the input of described second current-limiting circuit, the output of second current-limiting circuit is electrically connected with second input of described comparator, and second output of this switching circuit also is electrically connected with current sampling circuit.
5. the LED lamp controller based on the digital PWM control technology according to claim 4, described first current-limiting circuit is made up of first current-limiting resistance; Described second current-limiting circuit is made up of second current-limiting resistance; Described current sampling circuit is made up of a current sampling resistor.
6. the LED lamp controller based on the digital PWM control technology according to claim 5 is characterized in that described switching circuit mainly is made of a NMOS pipe; The grid of this NMOS pipe is electrically connected with the output of described power driving circuit, the drain electrode of this NMOS pipe is electrically connected with the negative pole end of pairing that group LED lamp string, source electrode is electrically connected with second input of described comparator by described second current-limiting resistance, this source electrode also passes through described current sampling resistor ground connection, and is electrically connected with described LED lamp string parameter detecting unit.
7. the LED lamp controller based on the digital PWM control technology according to claim 6 is characterized in that, described power driving circuit is an OTL power amplification circuit; This OTL power amplification circuit comprises a NPN triode and a PNP triode; The base stage of described NPN triode is electrically connected with the base stage of described PNP triode, and the collector electrode of this NPN triode is electrically connected with a power supply, and emitter is electrically connected with the emitter of described PNP triode; The collector electrode of described PNP triode is electrically connected with the source electrode of described NMOS pipe; The base stage of this NPN triode is electrically connected with the output of described comparator with the common contact of the base stage of PNP triode, and the emitter of this NPN triode is electrically connected with the grid of described NMOS pipe with the common contact of the emitter of PNP triode.
8. according to claim 1 or 4 described LED lamp controllers, it is characterized in that described DC-DC converter is the inverse-excitation type DC converter based on the digital PWM control technology;
This inverse-excitation type DC-DC converter comprises a transformer, NMOS pipe and a NMOS tube drive circuit; One end of the first siding ring of described transformer is electrically connected with an end of the output of described power management module, and the other end is electrically connected with the drain electrode of described NMOS pipe; One end of this transformer secondary lateral coil is connected with the positive electrical of diode, and the other end is connected with the negative electricity of this diode by an electric capacity; The negative pole of this diode and described one group of LED lamp string or the positive terminal of organizing LED lamp string are electrically connected more; The input of described NMOS tube drive circuit is electrically connected with the described first pwm signal output unit, and output is electrically connected with the grid of described NMOS pipe; The source electrode of this NMOS pipe is electrically connected with the other end of the output of described power management module.
9. the LED lamp controller based on the digital PWM control technology according to claim 2 is characterized in that this LED lamp controller also comprises a bleeder circuit and a voltage sample circuit; The input of described bleeder circuit receives from the power supply voltage signal of outside input, and output is electrically connected with described LED lamp string parameter detecting unit; The input of described voltage sample circuit receives from the pwm signal of outside input, and output is electrically connected with the input of described pwm signal detecting unit.
10. the LED lamp controller based on the digital PWM control technology according to claim 1 is characterized in that described power management module comprises reverse-connection preventing circuit and filter circuit; The input of described reverse-connection preventing circuit receives from the power supply voltage signal of outside input, and output is electrically connected with the input of described filter circuit, and the output of described filter circuit is electrically connected with the input of described DC-DC converter.
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| CN111148318A (en) * | 2018-10-16 | 2020-05-12 | 江苏万邦微电子有限公司 | Heavy-current driving LED control circuit |
| CN112770449A (en) * | 2019-11-05 | 2021-05-07 | 华域视觉科技(上海)有限公司 | Constant current driving system for automobile signal lamp and driving method thereof |
| CN112770449B (en) * | 2019-11-05 | 2024-02-02 | 华域视觉科技(上海)有限公司 | Constant-current driving system for automobile signal lamp and driving method thereof |
| CN116647956A (en) * | 2023-06-12 | 2023-08-25 | 钰泰半导体股份有限公司 | Parallel time-sharing multiplexing brightness control system based on series switch |
| CN116647956B (en) * | 2023-06-12 | 2024-05-03 | 钰泰半导体股份有限公司 | Parallel time-sharing multiplexing brightness control system based on series switch |
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