CN102711330A - Rapid reaction energy balancing calculation technology-based light-emitting diode (LED) driving method and system - Google Patents
Rapid reaction energy balancing calculation technology-based light-emitting diode (LED) driving method and system Download PDFInfo
- Publication number
- CN102711330A CN102711330A CN2012101770419A CN201210177041A CN102711330A CN 102711330 A CN102711330 A CN 102711330A CN 2012101770419 A CN2012101770419 A CN 2012101770419A CN 201210177041 A CN201210177041 A CN 201210177041A CN 102711330 A CN102711330 A CN 102711330A
- Authority
- CN
- China
- Prior art keywords
- output
- input
- current
- power
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Abstract
The invention discloses a rapid reaction energy balancing calculation technology-based light-emitting diode (LED) driving system in the fields of environmental protection, energy saving, carbon reduction and solar energy storage. The system comprises an energy balancing logic module, a sampling and holding circuit, an average current input estimation circuit and a power factor correction module, wherein the output ends of the sampling and holding circuit and the average current input estimation circuit are connected with the energy balancing logic module respectively, and are used for generating a turning-on signal for an LED control switch to control the on-time of the LED control switch through an energy balancing point; and the output ends of the sampling and holding circuit and the power factor correction module are connected with the energy balancing logic module respectively, and are used for generating a turning-off signal for the LED control switch to control the off-time of the LED control switch through a power factor correction current value. An output signal is changed along with input voltage, and has different pulse widths, and input current can be rapidly controlled to meet requirements; and in addition, capacitors with high capacitance values are not required to be used for the input and output ends.
Description
Technical field
The present invention relates to the LED illumination Driving technique that exchanging of a kind of environmental protection, carbon reduction and storage of solar energy field changeed direct current, be specifically related to LED driving method and system thereof that a kind of fast reaction energy balance computing obtains high precision.
Background technology
Though it is quite long to exchange the life-span of LED particle in the LED illuminator of importing at present; But the part of electrochemical capacitor often that system at first damages; This is because LED illuminator operational temperature is too high and the relation of heat radiation difficulty, causes the inner electrolyte of electrochemical capacitor dry and rotten easily, loses the function that the due energy of a charge of electrochemical capacitor stores; Especially the thermal source of luminaire can continue hot, special below the small size device as the bulb lamp.Can cause the inner electrolyte volatilization of electrochemical capacitor to make the life-span of electrochemical capacitor and LED illuminator become very short like this, so can not bring into play the LED characteristics also more durable than traditional tube.This is one of maximum bottleneck of present LED lighting apparatus.Because the deterioration of LED assembly or the variation of input voltage and output voltage, system often can not keep accurate secondary side current definite value in addition, makes brightness or the illumination uniformity variation of LED.
To sum up, follow-on lighting apparatus is in order to improve the service efficiency of the energy, and countries in the world have been stipulated energy efficient capacity standard of new generation one after another.In order to lower the day by day exhausted energy of the earth, it is extremely important that High Power Factor becomes in illuminator, but how can in simple system, just can reach the effect of power factor, also is the research theme of a hot topic.
As shown in Figure 1, be traditional inverse-excitation type systems technology, as control LED control switch Q1, when Q1 opens, transformer primary and secondary side Lp input current and storage power; When Q1 closed, the LED that secondary side current just can be exported to Vo used.In switch opens, the inductance of output can't provide electric current, so the electric current in this time is provided by the capacitor C out of output.Lp, Ls, La are three end points of transformer among the figure, are respectively Lp primary and secondary side, Ls secondary side and La secondary side, and wherein the La secondary side can be used for detecting the signal of output voltage V o.According to traditional system: LED control switch Q1 to open control be the frequency clock by the given frequency of crystal oscillator, when frequency signal provides, switch opens.The shutdown signal of LED control switch Q1 is when output is higher than reference voltage Vref, and error amplifier EA output COMP can rise, and comparator C MP will see shutdown signal off after COMP switches to triangular wave, makes switch close.
But above-mentioned input used in the prior art and output electrochemical capacitor all have following defective to improve:
(1) input electrochemical capacitor: generally use electrochemical capacitor to be because the value of electrochemical capacitor is bigger; If do not use input capacitance Cin (or very big electrochemical capacitor) at input; The more energy of a charge of the not enough storage of capacitance; In Fig. 2, input Vin can produce M type string ripple, and input voltage vin can be along with exchanging V
ACSignal and changing.Because the variation of input, the ripple bandwidth signals of controller must be followed the inverse ratio of input voltage and become, and can make the design of controller be not easy.Especially in fixed system frequently.So input uses electric capacity to be because filtering is that more convenient controller in inverse-excitation type is controlled near the DC value with the waveform filter behind the bridge rectifier through regular meeting.In addition on the one hand, because energy conservation theory, it is constant that the purpose of system will make output voltage and output current.So the average current of input must be inversely proportional to input voltage.
(2) output electrochemical capacitor: because in the control of inverse-excitation type, when LED control switch Q1 opened, the electric current of inverse-excitation type only can be in the primary and secondary side, and auxiliary plan does not have electric current.And when LED control switch Q1 closed, secondary side just had electric current supply.So work as switch opens, in the interruption half period that output current is supplied with, the LED electric current can only be supplied with by the capacitor C out of secondary side output.As shown in Figure 1.
So in general, the output capacitance value is big more, can overcome more when input end switch is opened, and secondary side does not have the problem of electric current supply in blink, and output can be by the temporary transient supplying electric current value of the electric capacity of secondary side in the blink that does not have the electric current supply.Electrochemical capacitor is more little, and secondary side output current ripple wave shape is poor more.This is because big electric capacity just has enough store charges, is used for supporting that the electric current of LED in the half period uses.
In addition; Based on because principle of conservation of energy; Input power Pin is multiplied by efficient Eff and equals power output Pout, i.e. Eff*Pin=Pout, and above-mentioned formula can be equivalent to input voltage vin and input current Iin multiplies each other; With output voltage V o and the output current Io Eff*Vin*Iin=Vo*Io that multiplies each other, so output current Io will equal Io=Eff*Vin*Iin/Vo.
Can be explained that by above-mentioned formula output current will keep an accurate definite value, the product of output voltage and input current is being divided by with output voltage, must be controlled as a definite value.If can realize such control at once in each cycle; Output current so just can be realized high speed output current homeostasis at once in one-period; And the variation of voltage and input current is gone in reflection output at once, makes the total system effect become unusual excellent.
Change but follow three above-mentioned variablees (input voltage, input current and output voltage) when input, because variable is too many, make the variation degree of freedom of system that three-dimensional variation arranged, according to the theory of control system, unsettled phenomenon can take place in system.The variation relation of three-dimensional of three variablees become the variation of having only one dimension so the present invention through limiting the variation of two other variable degree of freedom, makes, solve unsure state fully.
Summary of the invention
The present invention is directed to the above-mentioned deficiency that prior art exists; A kind of LED driving method and system thereof based on fast reaction energy balance computing is provided; Realize that the output signal changes along with input voltage and to have a different pulse ripple wide, the requirement that the control input current reaches, and simultaneously can be directly with the electric capacity removal of input; System's wide control of balance wave very fast automatically, and can not influence the output voltage and the SRT of final system.Realization of the present invention does not need the electrochemical capacitor of Da Rong value, can make that the LED illuminator is more reliable yet and can use for a long time; The function that possesses power factor correction simultaneously meets the LED illumination application system of high wattage and the requirement on the standard of power and energy saving of new generation, is highly suitable for improving the more depleted energy of Earth Day and the living environment of deterioration.
The present invention realizes through following technical scheme:
The present invention relates to a kind of LED driving method based on fast reaction energy balance computing, with illuminator:
A) transformer primary and secondary side input power is estimated the comparison value of average and Circuit Fault on Secondary Transformer power output estimation average, and
B) comparison value of the source voltage of LED control switch and transformer primary and secondary side input current amplitude profile control signal, production burst am signals act on the control of the grid realization opening and closing of LED control switch.
Described LED control switch is N channel enhancement MOSFET pipe or bipolar npn junction transistor.
Described transformer primary and secondary side input power estimates that average is meant: ask average after the stack of the product of input current estimated value and triangular wave in the transformer primary and secondary side system input voltage of illuminator and the switch opens time of LED control switch.
Described input current estimated value is estimated to obtain through peak current detection and electric current through the source class voltage of LED control switch; Specifically obtain the total amount of input current in the one-period, open the cycle of closing to obtain the average current input value divided by the whole LED control switch then through the time of opening that records the input current peak value and multiply by the LED control switch.
The described cycle of closing of opening divided by the whole LED control switch superposes through total amount and triangular wave with input current; Along with this value of time increase can become big gradually and cut short the time that switch cuts out; Open down ahead of time cycle switch, and realize the cycle is done the function of division indirectly.
The slope of described triangular wave can be used as the system power slope-compensation simultaneously, also can be used as the restriction of frequency.
Described Circuit Fault on Secondary Transformer power output estimates that average is meant: the transformer of illuminator mean value behind the integration of the product of side section system's output voltage and output current.
Described transformer primary and secondary side input current amplitude profile control signal is meant: system's output voltage after error is amplified Integral Processing with the system input voltage multiplying power resulting signal that multiplies each other.
Described error amplification is meant: system's output voltage and 0.5V reference voltage are compared the gained difference.
Described comparison value is meant: compare the higher value in two signals.
The present invention relates to a kind of LED drive system based on fast reaction energy balance computing; Comprise: energy balance logic module, input current estimation module, power averaging estimation block and power factor correction module; Wherein: the input of energy balance logic module receives the output signal of secondary terminals power output signal, power averaging estimation block, the output signal of power factor correction module and the source voltage signal of LED control switch respectively; The output of energy balance logic module links to each other with the grid of LED control switch and the output pulse width modulation signal; The power averaging estimation block obtains primary and secondary side input power estimation average according to the product of the input current estimated value of primary and secondary side system input voltage and the output of input current estimation module, and the power factor correction module obtains primary and secondary side input current amplitude profile control signal according to difference and system's input voltage of system's output voltage and reference voltage.
Described energy balance logic module comprises: two comparators and a rest-set flip-flop; Wherein: the output signal of the average estimation block of input difference received power of first comparator and the secondary terminals power output signal behind the LPF; The input of second comparator receives the output signal of LED control switch source class voltage signal and power factor correction module respectively; The output of two comparators links to each other with the input of rest-set flip-flop, and rest-set flip-flop production burst am signals also exports the grid of LED control switch to.
Be provided with or the gate logic switch between the output of described first comparator and the input of rest-set flip-flop; The output signal and the maximum switch opens time (Max-on-time) of first comparator are carried out exclusive disjunction; Through restriction system output energy; Protection system provides restriction to be unlikely to burn with protection system for suddenly high energy demand.
Described input current estimation module comprises: current peak detector and electric current estimator; Wherein: the source class voltage signal of current peak detector reception LED control switch is done through peak value and is exported the electric current estimator to after sampling is handled, and the electric current estimator is through handling product to the power averaging estimation block of back output input current estimated value and system's input voltage to multiplying each other of source class voltage signal peak value after sampling and switch opens time.
Described power averaging estimation block adopts any one in following three kinds of structures:
A) the power averaging estimation block comprises: two low pass filters and an adder; Wherein: the input of first low pass filter links to each other with the input current estimation module and exports the product of input current estimated value and system's input voltage to adder and obtains the input power estimated value, and adder is superimposed to the input power estimated value with triangular wave and realizes asking mean deviation output primary and secondary side input power to estimate average to energy balance logic module; Second low pass filter is estimated average to energy balance logic module according to the product output secondary side power output of system's output voltage and the preset definite value of system's output current.
B) the power averaging estimation block comprises: two low pass filters, a not gate logic switch and one or gate logic switch; Wherein: in ohmically cross-pressure value, promptly the product of the source class voltage of LED control switch exports the energy balance logic module to first low pass filter according to system's input voltage and system's input current; Second low pass filter is estimated average to energy balance logic module according to the product output secondary side power output of system's output voltage and the preset definite value of system's output current; The not gate logic switch to the maximum switch opens time of LED control switch negate the back through or sue for peace minimum switching time of gate logic switch and LED control switch and export the output of first comparator of energy balance logic module to.
C) the power averaging estimation block comprises: two sampling hold circuits and adder, and wherein: first sampling hold circuit links to each other with the input current estimation module and exports the product of input current estimated value and system's input voltage to the energy balance logic module; Second sampling hold circuit exports adder to according to the product of system's output voltage and the preset definite value of system's output current, realizes asking mean deviation output secondary side power output to estimate average to energy balance logic module after through adder triangular wave oppositely being superposeed.
D) the power averaging estimation block comprises: sampling hold circuit and integrator, and wherein: sampling hold circuit is estimated average to energy balance logic module according to the product output secondary side power output of system's output voltage and the preset definite value of system's output current; Integrator links to each other with the input current estimation module and the product of input current estimated value and system's input voltage is estimated average to energy balance logic module as primary and secondary side input power.
Described power factor correction module adopts any one in following two kinds of structures:
I) the power factor correction module comprises: the error amplifier, RC damper and the multiplier that connect successively; Wherein: error amplifier exports the difference of system's output voltage signal and reference signal to RC damper and multiplier, and multiplier multiplies each other difference and multiplying power input signal and generates primary and secondary side input current amplitude profile control signal and export the energy balance logic module to;
Ii) the power factor correction module comprises: multiplier and the linear regulator and the optical coupler that are arranged at secondary side; Linear regulator receives the input voltage difference and exports different big or small electric currents to optical coupler; Behind the optical coupler received current and export switching current and building-out capacitor is done to discharge and recharge form the ride gain signal to multiplier, multiplier is with multiply each other generation primary and secondary side input current amplitude profile control signal and export the energy balance logic module to of difference and multiplying power input signal.
Also being provided with sampling hold circuit in the described LED drive system is used for to input current estimation module and power factor correction module system's input voltage signal and system's output voltage signal being provided; This sampling hold circuit comprises: secondary side inductance that is coupled with primary and secondary lateral coil and second siding ring respectively and two sampling resistors that are attached thereto; Wherein: when switch opens; Primary and secondary side inductance cross-pressure be input voltage over the ground, the electric resistance partial pressure ratio that the number of turns through secondary side inductance and primary and secondary lateral coil is multiplied by sampling resistor Rs1 and Rs2 than Na/Np obtains input voltage vin and is used to export to the energy balance logic module; When switch cut out, the voltage ratio that the number of turns through secondary side inductance and second siding ring is multiplied by sampling resistor Rs1 and Rs2 than Na/Ns obtained output voltage V o and is used to export to the energy balance logic module.
Native system carries out work in the following manner: the signal Vin*Iinx after the Iinx of input voltage detection module output Vin and the output of input average current estimation circuit multiplies each other, intake balanced logic module and obtain the average Iin_avg of input current via internal circuit; Output voltage detection module output Vo and the constant intake balanced logic module as a result that multiplies each other afterwards; Error amplifier obtains output voltage V o and the 0.5V reference voltage back output signal COMP that compares according to Vs; Whether determine energy demand; When energy inadequately then COMP will rise, correspondence obtains the opening signal of bigger LED control switch Q1, i.e. power bandwidth modulation signals GD; Otherwise obtain the opening signal of less LED control switch Q1.
The string ripple signal that is multiplied by input voltage as the output signal COMP of error amplifier then obtains a reference waveform with string wave contour, can be used to control the time point that LED control switch Q1 closes.
The present invention controls primary and secondary side current cycle and electric current summit simultaneously through brand-new energy control mode.And proposed compute mode fast, the variation of current/voltage is gone in can be automatically corresponding output and the secondary side output current of balanced short time changes, and to reach an accurately current ration output fast, simultaneity factor can also reach high stability.Simultaneously, the present invention can also integrate the power factor correction function simultaneously by the mode of quick computing, and a key technology of directly getting rid of all electrochemical capacitors also can be provided.Circuit does not need unnecessary complicacy control yet, can also keep high stability control.Use the control of quite simplifying just can reach very high power factor correction value, the structure of use inverse-excitation type just can be reached the result of power factor correction PFC＞99%; And the function of possessing fast reaction and power factor correction.And it is minimum that system component quantity is changed to.
Beneficial effect:
The beneficial effect of control technology of the present invention is, proposed the rapid-action led controller, can obtain:
1) good reaction speed, and keep system stability.So how output current no matter system can be replied fast by disturbance and be definite value.
2) High Power Factor output, and meet LED illumination standard of new generation.
3) can cancel the use of the electrochemical capacitor of input and output, and keep the quality of outputting current steadily.Make the long-time use of LED illuminator become possibility.
Description of drawings
Fig. 1 is the technological sketch map of traditional inverse-excitation type control.
Fig. 2 is the embodiment of the invention 1 structural representation.
Fig. 3 is the detection method sketch map of input voltage and output voltage.
Fig. 4 is the detection sketch map of input voltage and output voltage.
Fig. 5 is the embodiment of the invention 2 structural representations.
Fig. 6 is 3 three kinds of modification sketch mapes of the embodiment of the invention.
Embodiment
Elaborate in the face of embodiments of the invention down, present embodiment provided detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment being to implement under the prerequisite with technical scheme of the present invention.
As shown in Figure 2, present embodiment can be controlled the summit of input current and the cycle of system switching simultaneously, makes the driver of LED except obtaining accurate output current, the extraneous electric current and voltage condition of system's fast reaction is changed.
System's meeting computing input voltage; Output voltage and input current three-dimensional variable; Operation result can be controlled the summit of input current and the cycle of system switching, makes output current keep accurate definite value, by controller two restrictions of control adding with three-dimensional variable; Variation that not only can the fast reaction three-dimensional variable has also kept the stability of system's control.No matter characteristics are variations of various external conditions, the output current that can control whole short time intercycle becomes quite average.
As shown in Figure 2, electric current acquiescence definite value Io is the fixing preset value in System on Chip/SoC inside.The current value of output can be by Io value and the decision of plug-in current sense resistance R CS value.
The fast reaction effect of system, except making systematic function become very excellent, can fast reaction and automatically control make that recently secondary side LED electric current keeps definite value in the cycle several times, so can also the electric capacity of Da Rong value all be removed.
And because quick computing can be done to input voltage by system, so can enter power factor correction to integration easily.The control and the power factor controlling of quick energy computing that present embodiment has utilized new-type systems incorporate.
As shown in Figure 2, the input voltage detection module goes out the signal Vin*Iinx after Iinx multiplies each other as a result of Vin and input average current estimation circuit, intake balanced logic module.After the output voltage detection module goes out Vo in addition, multiply each other with constant.Intake balanced logic module as a result then, last energy balance logic module can determine the time of opening and the average current input value of switch.Just determined to decide the cycle time of whole system.
As shown in Figure 2, after output voltage that testing circuit is obtained by Vs and inner 0.5V reference voltage are compared; Controlling error amplifier; Whether the output COMP of error amplifier determines energy demand, if the not enough COMP of energy will rise and obtain bigger LED control switch Q1 opening signal; Be power bandwidth modulation signals GD, open the wide time GD of ripple otherwise obtain less LED control switch Q1.The string ripple signal of input voltage obtains a reference waveform with string wave contour on the COMP signal times.And be used for controlling the time point that LED control switch Q1 closes.After the decision signal sent into the length of switch opens.Reach High Power Factor simultaneously.
System is simultaneously by input voltage, and it is definite value that input current, output voltage are controlled output current, and three variablees can be reflected at ripple on wide and cycle at once.Make to change fast and become possibility.
As shown in Figure 3; For the voltage and the output voltage of the input in the present embodiment can be obtained by the voltage of the Vs in the sampling hold circuit; During switch opens; Primary and secondary side inductance cross-pressure be input voltage over the ground, input voltage can be obtained than the electric resistance partial pressure ratio that Na/Np is multiplied by resistance R s1 and Rs2 via the number of turns by secondary side.S/H is sampling and holding circuit.Because the signal of each cycle Vs all can change, so can only when noise ratio is less, sample and keep the whole cycle to do computing for the control circuit of back.
When switch cut out, output voltage can be obtained than the voltage ratio that Na/Ns is multiplied by resistance R s1 and Rs2 via the number of turns by secondary side.
The part of input current in addition: when LED control switch Q1 opens; The voltage of LED control switch source class voltage Vcs can reflect the size of input current; The size of the peak value of input current value can be set by the detecting of the input current in system resistance R cs; Set point is Iin_peak=Vcs/Rcs, and wherein Iin_peak is the peak value of input current value, can obtain at that time the value of input current and the peak value of electric current so observe Vcs.But, and be the triangular wave waveform that keeps a rising because input current has only in the time of switch opens and just can flow.And in the time of closing when switch, input current will end.Obtain average input current so must do an integration to whole section electric current.
As shown in Figure 4, periodic signal Ts and switch opens time T on can be directly obtain from internal system, by the current maxima detector input current extreme value (I_peak Detector circuit) of having sampled.Diode among Fig. 4 and electric capacity have formed an electric current summit and have detected sampler.Be multiplied by switch opens time T on then, and to circuit remove mean value of last cycle.
For the simplification of circuit system, so can be earlier with also not having average electric current elder generation and voltage to do multiplication.The part of the division arithmetic that the cycle is average can process in the compensation slope of Fig. 2, will obtain the average current input value then.In the system of Fig. 2, directly handle division arithmetic together then, to save circuit area with the method for slope-compensation.Shown in the triangular wave square frame among Fig. 2.
So can be reflected at together in the time of Ton changing easily according to such system.When obtaining input voltage, after output voltage and the average input current value.Realization on the circuit is as among Fig. 2, uses the two ends of one first comparator C MP1, handles the computing that Vin*Iin_avg equates with the Vo*Io energy.Wherein Iin avg is the input average current.When first comparator C MP1 input both positive and negative polarity both sides equate, obtain signal (S1) and open switch, the mean value Iin_avg of diverter switch control input current Iin.Make energy equate that reaching the control output end electric current is definite value.Obtain the time that an output is opened at last.The time of opening of switch is decided by energy, so the Cycle Length of the control signal GD of LED control switch Q1 can be directly proportional with the height of input voltage.
Can be found that by top description system has reflected output voltage simultaneously in the time control that a LED control switch Q1 opens, input voltage and input current change.When above-mentioned three variablees had change, system was reflected in the control of switch at once, so reaction is quite quickly.
In addition in Fig. 2, (Max-on-time) control signal of maximum switch opens time can restriction system output energy, can protection system for suddenly high energy demand, provide restriction to be unlikely to burn with protection system.
In addition on the one hand, the value of the input voltage that obtains at input detecting circuit, the input signal that can bring as the power factor correction module uses, and it can be that a string wave-wave type voltage also can be the voltage near direct current.
If capacitor C in is removed, input voltage signal will be a string ripple signal, and the ratio of Ka is relevant with the divider resistance Rs1 and the Rs2 of secondary side on the input voltage vin.
The signal Vm that the string ripple signal of this Ka*Vin and the output COMP of error amplifier EA multiply each other and obtain another approximate string ripple, as shown in Figure 2.Vm is used for being used as the profile control signal of input current height, the shutdown signal R1 of control LED control switch Q1.So, the electric current of input will be similar to input voltage signal, also just can reach the function of High Power Factor.
In the new control mode that proposes, the time of opening of switch is decided by energy, and the shut-in time of switch is decided by the control of power factor correction.
Input voltage; Three signals of output voltage and average input current value can obtain a Wave-wide regulation controlled electric signal on the flip-flop of SR; The signal of flip-flop S end is to be relevant to the control of these three variablees and the restriction relation of ripple bandwidth signals GD; And the R of flip-flop end is the restriction relation of relevant output voltage V o and ripple bandwidth signals GD, and this is first restriction between three variablees.Make control system become two dimensions by three-dimensional variable.So other first comparator C MP1 control intake equals to export energy and can obtain another restrictive condition again, and controls in time to have limited and export the time point that energy equates, is attached to the control of the wide GD of output wave.Make system variable have and transfer the one dimension variable to, make system's complete stability by the bidimensional variable.
Because input voltage Vo signal and Vin signal and Iin signal can produce some differences along with the error of each investigation; These values can cause LED control switch Q1 in time; Each cycle is compared down the shake that takes place, so used low pass filter to slow down the variation of product (Vin*Iin_avg and Vo*Io).At the negative pole of the first comparator C MP1, low pass filter has combined the addition of triangular wave in addition, and the function of average period is provided.The use of triangular wave is except on making that general power supply designs, and the slope-compensation of Controlled in Current Mode and Based is achieved, and has realized the periodic signal average function simultaneously, because given the restriction on the system time, so also obtained the control stability of system at last.
When importing power supply Vin signal, utilize this characteristic that the function of a power factor correction is provided in controller near a M type string ripple.Output reacts by rapid system, thus can be so that system fast and stable control output current be a definite value, and remove the output electrochemical capacitor.And then native system can save the electrochemical capacitor of all the Da Rong values on the LED drive system fully.The electrochemical capacitor of input and output is a bottleneck very big in the LED system, and the life-span of electrochemical capacitor under high heat can reduce greatly.So how under the situation of not using electrochemical capacitor, can also obtain the performance performance of good LED drive system, be a very big challenge.
Present embodiment is used the computer control mode of energy balance fast, the energy that the last cycle of fast reaction lacks, and can the quick phase in next week required current value be provided, so can be so that output current just can reach the control of balance in a short period of time.Therefore do not need the electric capacity of too big capacitance yet.Because energy can be calculated fast and fast reaction in the system capacity supply, so performance is made a return journey and removed output capacitor by this.So can use the ceramic condenser of smaller appearance value to replace at the electric capacity of output; Because technology can a short time of balance average output current; So do not need large-scale electrolysis electric capacity to come the unbalanced of the long secondary side current of balance; Solved the problem that electrochemical capacitor is also removed in input, making the appearance value of output capacitance diminish becomes possibility.
Be illustrated in figure 5 as the Another application of present embodiment; Compare with embodiment 1; Present embodiment also can be applied in the flyback power supply transducer of the secondary side optocoupler back coupling control types under the high power except being applied in the primary and secondary side control flyback power supply transducer like Fig. 2.
In the present embodiment; The linear regulator and the optical coupler that will be arranged at secondary side when setting up multiplier replace the error amplifier among Fig. 2; Wherein: linear regulator receives the input voltage difference and exports different big or small electric currents to optical coupler; Behind the optical coupler received current and export switching current and building-out capacitor is done to discharge and recharge form ride gain signal COMP to multiplier, multiplier is with multiply each other generation primary and secondary side input current amplitude profile control signal and export the energy balance logic module to of difference and multiplying power input signal.
Present embodiment makes output voltage more accurate through another kind of form.
Embodiment 3
Shown in Fig. 6-1; Present embodiment is compared with embodiment 1; The input switch of first comparator C MP1 input is opened the electric current I inx of time and is replaced by LED control switch source class voltage Vcs, because Vcs except the information of input current is arranged, also has along with the time increases and the characteristic of increase simultaneously; Etc. same triangular wave and make the effect of removing with whole cycle time, so also can obtain the controlled function identical with Fig. 2.
Further; Shown in Fig. 6-2; Can also on two inputs of the first comparator C MP1, sampling hold circuit be set all; And subtracting each other anodal input with slope compensation as the first comparator C MP1 with the product of the output voltage V o after keeping through sampling and output current Io, the product of input voltage vin after sampling is kept and the input average current Iin_avg that obtains is imported as the negative pole of the first comparator C MP1.
Above-mentioned sampling hold circuit also can be used the low pass filter LPF replacement of identical function.Function is the same.
Except that above-mentioned; Shown in Fig. 6-3; Can also on two inputs of the first comparator C MP1, distinguish sampling hold circuit and integrator; And with the product of the output voltage V o after keeping through sampling and output current Io as the anodal input of the first comparator C MP1, the product of input voltage vin behind the integration and Iinx is imported as the negative pole of the first comparator C MP1.
Present embodiment makes that through another kind of form the calculating of mean value of input current is more accurate.
Two embodiment to sum up, technology of the present invention has following technological progress:
(1) go into change in voltage for output, can reach the high accurancy and precision and the fast reaction of LED drive current:
The control and the power factor controlling of quick energy computing of having utilized new-type systems incorporate, can fast reaction and automatically control make that recently secondary side LED electric current keeps definite value in the cycle several times.No matter be that input voltage changes, output voltage changes, or output current is when changing, and can fast reaction output current control be got back to accurately on the definite value.No matter characteristics are variations of various external conditions, the output current that can control whole short time intercycle becomes quite average.
(2) meet the energy conservation criteria that lighting apparatus gets power factor correction
Because system response is quick, so system can be according to the variation of input voltage, rapid update the system input current value is so integrated in the function entering system control of power factor correction easily.Especially use the control of quite simplifying just can reach very high power factor correction value.Can in the inverse-excitation type structure, make power factor greater than 99%.
(3) omit electrochemical capacitor on all LED drive systems
The use of electrochemical capacitor has a strong impact on the useful life of LED lighting apparatus; Use the control mode of new-type energy balance; The output current that can control whole short time intercycle becomes quite average; Make output current can reach the control of balance in a short period of time, output current control can reach the short time suitable accurately and not need extra big output capacitance, make the output electrochemical capacitor to remove.In addition owing to integrated input voltage signal, so the variation that system can the fast reaction input voltage makes the big electrochemical capacitor of input also can remove simultaneously.So new-type system can get rid of input and input electrochemical capacitor fully.The high-reliability of realization system.
Native system adopts new structure and system thereof, reach fast reaction and export into voltage and current, and system has high stability; Can accurately adjust the secondary side output current value fast.No matter change in voltage is gone in output, or the output current variation, all can rapidly output current be controlled back accurate definite value; Integrate power factor correction simultaneously, use the control of quite simplifying just can reach very high power factor correction value.In the inverse-excitation type structure, can make PF＞99%; Can remove output and the electrochemical capacitor of importing simultaneously, it is minimum to make system component change to.
Claims (10)
1. the LED driving method based on fast reaction energy balance computing is characterized in that, with illuminator:
A) transformer primary and secondary side input power is estimated the comparison value of average and Circuit Fault on Secondary Transformer power output estimation average, and
B) comparison value of the source voltage of LED control switch and transformer primary and secondary side input current amplitude profile control signal,
The production burst am signals acts on the control of the grid realization opening and closing of LED control switch.
2. method according to claim 1 is characterized in that, described LED control switch is N channel enhancement MOSFET pipe or bipolar npn junction transistor.
3. method according to claim 1; It is characterized in that described transformer primary and secondary side input power estimates that average is meant: ask average after the stack of the product of input current estimated value and triangular wave in the transformer primary and secondary side system input voltage of illuminator and the switch opens time of LED control switch.
4. method according to claim 1 is characterized in that, described input current estimated value is estimated to obtain through peak current detection and electric current through the source class voltage of LED control switch.
5. method according to claim 1 is characterized in that, described Circuit Fault on Secondary Transformer power output estimates that average is meant: the transformer of illuminator mean value behind the integration of the product of side section system's output voltage and output current.
6. method according to claim 1 is characterized in that, described transformer primary and secondary side input current amplitude profile control signal is meant: system's output voltage after error is amplified Integral Processing with the system input voltage multiplying power resulting signal that multiplies each other.
7. LED drive system based on fast reaction energy balance computing; It is characterized in that; Comprise: energy balance logic module, input current estimation module, power averaging estimation block and power factor correction module; Wherein: the input of energy balance logic module receives the output signal of secondary terminals power output signal, power averaging estimation block, the output signal of power factor correction module and the source voltage signal of LED control switch respectively; The output of energy balance logic module links to each other with the grid of LED control switch and the output pulse width modulation signal; The power averaging estimation block obtains primary and secondary side input power estimation average according to the product of the input current estimated value of primary and secondary side system input voltage and the output of input current estimation module, and the power factor correction module obtains primary and secondary side input current amplitude profile control signal according to difference and system's input voltage of system's output voltage and reference voltage.
8. drive system according to claim 7; It is characterized in that; Described input current estimation module comprises: current peak detector and electric current estimator; Wherein: the source class voltage signal of current peak detector reception LED control switch is done through peak value and is exported the electric current estimator to after sampling is handled, and the electric current estimator is through handling product to the power averaging estimation block of back output input current estimated value and system's input voltage to multiplying each other of source class voltage signal peak value after sampling and switch opens time.
9. drive system according to claim 7 is characterized in that, described power averaging estimation block adopts any one in following two kinds of structures:
A) the power averaging estimation block comprises: two low pass filters and an adder; Wherein: the input of first low pass filter links to each other with the input current estimation module and exports the product of input current estimated value and system's input voltage to adder and obtains the input power estimated value, and adder is superimposed to the input power estimated value with triangular wave and realizes asking mean deviation output primary and secondary side input power to estimate average to energy balance logic module; Second low pass filter is estimated average to energy balance logic module according to the product output secondary side power output of system's output voltage and the preset definite value of system's output current;
B) the power averaging estimation block comprises: two low pass filters, a not gate logic switch and one or gate logic switch; Wherein: in ohmically cross-pressure value, promptly the product of the source class voltage of LED control switch exports the energy balance logic module to first low pass filter according to system's input voltage and system's input current; Second low pass filter is estimated average to energy balance logic module according to the product output secondary side power output of system's output voltage and the preset definite value of system's output current; The not gate logic switch to the maximum switch opens time of LED control switch negate the back through or sue for peace minimum switching time of gate logic switch and LED control switch and export the output of first comparator of energy balance logic module to;
C) the power averaging estimation block comprises: two sampling hold circuits and adder, and wherein: first sampling hold circuit links to each other with the input current estimation module and exports the product of input current estimated value and system's input voltage to the energy balance logic module; Second sampling hold circuit exports adder to according to the product of system's output voltage and the preset definite value of system's output current, realizes asking mean deviation output secondary side power output to estimate average to energy balance logic module after through adder triangular wave oppositely being superposeed;
D) the power averaging estimation block comprises: sampling hold circuit and integrator, and wherein: sampling hold circuit is estimated average to energy balance logic module according to the product output secondary side power output of system's output voltage and the preset definite value of system's output current; Integrator links to each other with the input current estimation module and the product of input current estimated value and system's input voltage is estimated average to energy balance logic module as primary and secondary side input power.
10. drive system according to claim 7 is characterized in that, described power factor correction module adopts any one in following two kinds of structures:
I) the power factor correction module comprises: the error amplifier, RC damper and the multiplier that connect successively; Wherein: error amplifier exports the difference of system's output voltage signal and reference signal to RC damper and multiplier, and multiplier multiplies each other difference and multiplying power input signal and generates primary and secondary side input current amplitude profile control signal and export the energy balance logic module to;
Ii) the power factor correction module comprises: multiplier and the linear regulator and the optical coupler that are arranged at time side; Linear regulator receives the input voltage difference and exports different big or small electric currents to optical coupler; Behind the optical coupler received current and export switching current and building-out capacitor is done to discharge and recharge form the ride gain signal to multiplier, multiplier is with multiply each other generation primary and secondary side input current amplitude profile control signal and export the energy balance logic module to of difference and multiplying power input signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210177041.9A CN102711330B (en) | 2012-05-31 | 2012-05-31 | Rapid reaction energy balancing calculation technology-based light-emitting diode (LED) driving method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210177041.9A CN102711330B (en) | 2012-05-31 | 2012-05-31 | Rapid reaction energy balancing calculation technology-based light-emitting diode (LED) driving method and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102711330A true CN102711330A (en) | 2012-10-03 |
| CN102711330B CN102711330B (en) | 2014-06-18 |
Family
ID=46903827
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210177041.9A Expired - Fee Related CN102711330B (en) | 2012-05-31 | 2012-05-31 | Rapid reaction energy balancing calculation technology-based light-emitting diode (LED) driving method and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102711330B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102931914A (en) * | 2012-11-06 | 2013-02-13 | 昆山北极光电子科技有限公司 | Self-stabilizing waveform generating circuit |
| CN102946676A (en) * | 2012-11-23 | 2013-02-27 | 宁波市爱使电器有限公司 | Constant voltage and constant current power supply of light-emitting diode (LED) lamp |
| CN105636316A (en) * | 2014-11-25 | 2016-06-01 | 英飞凌科技奥地利有限公司 | Driver controller with internally calculated average output current |
| CN111867197A (en) * | 2019-04-26 | 2020-10-30 | 英飞凌科技股份有限公司 | Circuit for controlling delivery of electrical signals to one or more light emitting diode strings |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101232761A (en) * | 2007-01-18 | 2008-07-30 | 精工电子有限公司 | Led drive circuit |
| CN101369777A (en) * | 2007-08-14 | 2009-02-18 | 陈建志 | Power control circuit and electronic ballast with the same |
| CN101489342A (en) * | 2009-02-27 | 2009-07-22 | 杭州士兰微电子股份有限公司 | LED driver circuit and driving method thereof |
| CN101500358A (en) * | 2008-01-28 | 2009-08-05 | 杭州士兰微电子股份有限公司 | Output current compensation circuit of LED driving circuit |
| CN101707837A (en) * | 2009-11-27 | 2010-05-12 | 上海晶丰明源半导体有限公司 | LED drive circuit of source driver with change of output voltage and induction quantity keeping constant current |
| EP2254227A1 (en) * | 2009-05-19 | 2010-11-24 | STMicroelectronics Design and Application S.R.O. | Control device for a constant current flyback converter |
| CN102202449A (en) * | 2011-06-30 | 2011-09-28 | 杭州士兰微电子股份有限公司 | LED driving control circuit and method |
-
2012
- 2012-05-31 CN CN201210177041.9A patent/CN102711330B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101232761A (en) * | 2007-01-18 | 2008-07-30 | 精工电子有限公司 | Led drive circuit |
| CN101369777A (en) * | 2007-08-14 | 2009-02-18 | 陈建志 | Power control circuit and electronic ballast with the same |
| CN101500358A (en) * | 2008-01-28 | 2009-08-05 | 杭州士兰微电子股份有限公司 | Output current compensation circuit of LED driving circuit |
| CN101489342A (en) * | 2009-02-27 | 2009-07-22 | 杭州士兰微电子股份有限公司 | LED driver circuit and driving method thereof |
| EP2254227A1 (en) * | 2009-05-19 | 2010-11-24 | STMicroelectronics Design and Application S.R.O. | Control device for a constant current flyback converter |
| CN101707837A (en) * | 2009-11-27 | 2010-05-12 | 上海晶丰明源半导体有限公司 | LED drive circuit of source driver with change of output voltage and induction quantity keeping constant current |
| CN102202449A (en) * | 2011-06-30 | 2011-09-28 | 杭州士兰微电子股份有限公司 | LED driving control circuit and method |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102931914A (en) * | 2012-11-06 | 2013-02-13 | 昆山北极光电子科技有限公司 | Self-stabilizing waveform generating circuit |
| CN102946676A (en) * | 2012-11-23 | 2013-02-27 | 宁波市爱使电器有限公司 | Constant voltage and constant current power supply of light-emitting diode (LED) lamp |
| CN102946676B (en) * | 2012-11-23 | 2015-01-07 | 宁波市爱使电器有限公司 | Constant voltage and constant current power supply of light-emitting diode (LED) lamp |
| CN105636316A (en) * | 2014-11-25 | 2016-06-01 | 英飞凌科技奥地利有限公司 | Driver controller with internally calculated average output current |
| CN111867197A (en) * | 2019-04-26 | 2020-10-30 | 英飞凌科技股份有限公司 | Circuit for controlling delivery of electrical signals to one or more light emitting diode strings |
| CN111867197B (en) * | 2019-04-26 | 2023-01-17 | 英飞凌科技股份有限公司 | Circuit, system and method for monitoring current through LED string |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102711330B (en) | 2014-06-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103702486B (en) | LED driving circuit system, control circuit and control method | |
| CN102368661B (en) | Switching power supply with function of correcting power factor as well as control device and control method thereof | |
| CN203368317U (en) | High PFC constant current control device without loop compensation and voltage converter | |
| CN103428969B (en) | A kind of linear constant current LED drive circuit and LED lamp | |
| CN103152956A (en) | LED (Light Emitting Diode) driving circuit and constant-current control circuit thereof | |
| US20130051090A1 (en) | Current reference generating circuit and a constant current switch mode power supply control circuit and method thereof | |
| CN103648202B (en) | Active power factor correction control circuit, chip and LED (Light Emitting Diode) drive circuit | |
| CN107896069A (en) | A kind of New single-phase mixes three-level rectifier | |
| CN102369496B (en) | Stabilized DC power source device | |
| CN102946196B (en) | High power factor constant current driving circuit and constant-current device | |
| CN207869008U (en) | Interleaved parallel PFC power supply | |
| CN102186292B (en) | Primary edge current reference generating circuit and method for high power factor constant-current switch power supply | |
| CN203661377U (en) | Dual-winding single-stage primary side feedback type LED lamp drive circuit | |
| CN102364858B (en) | Constant-current switching power supply controller capable of controlling through primary side and method | |
| CN101247072A (en) | Voltage regulating circuit | |
| CN107682957B (en) | LED drive circuit and its control circuit and control method | |
| CN102931828B (en) | Circuit of power factor correction and improve the method for power factor | |
| CN203279254U (en) | LED driving circuit and constant current control circuit thereof | |
| CN103414334B (en) | PF is the long-life DCM Boost pfc converter of 1 | |
| CN103458557A (en) | LED drive control circuit and LED lamp | |
| CN103763812B (en) | A kind of solar energy and semiconductor illuminator based on DSP and control method thereof | |
| CN201667747U (en) | High-efficiency LED street lamp drive circuit | |
| CN104702095A (en) | Switching power supply controller and switching power supply comprising switching power supply controller | |
| CN102711330B (en) | Rapid reaction energy balancing calculation technology-based light-emitting diode (LED) driving method and system | |
| CN103281829B (en) | A kind of LED drive circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140618 Termination date: 20160531 |