CN103648219A - Light-emitting diode (LED) switch constant-current driving circuit - Google Patents
Light-emitting diode (LED) switch constant-current driving circuit Download PDFInfo
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Abstract
The invention provides a light-emitting diode (LED) switch constant-current driving circuit. The LED switch constant-current driving circuit comprises a voltage input module, an energy storage inductor, a freewheel diode, an LED module serving a load, a power tube for draining current and constant current, a detection module for detecting an input voltage phase state, a dimming control module connected to the detection module, an error amplifier connected to the dimming control module, a valley bottom detection circuit for detecting power tube drain voltage, a pulse width modulation circuit connected to the error amplifier and the valley bottom detection circuit, a control circuit for controlling the power tube according to detection voltage and PWM signals and a driving circuit of the power tube, wherein according to the dimming control module, input reference voltage Vref2 of the error amplifier and dimming control signals Vdimo are generated jointly through the detection voltage and reference voltage Vref1; the error amplifier enables the Vref2 to be compared with sampling voltage; and the pulse width modulation circuit is used for generating the PWM signals. According to the LED switch constant-current driving circuit, an electrolytic capacitor is not needed, an electronic transformer and a silicon controlled dimmer are compatible, the unique power tube in multiplexing simultaneously gives consideration to the draining current and the constant current, and the cost is effectively reduced.
Description
Technical field
The present invention relates to LED Drive Control Technique field, particularly relate to a kind of LED switch constant-current drive circuit.
Background technology
LED is the semiconductor device of working under a kind of low-voltage direct condition, under the low-voltage alternating-current initial conditions of controllable silicon dimmer and electronic transformer, the market demand that LED is replaced to the application such as existing MR16 is very vigorous, and on this basis again the demand of compatible silicon controlled dimmer be also very considerable in the international market.But when replacing the traditional lighting light fixtures such as MR16 with LED, can run into some problems:
First, the compatibility issue of LED and electronic transformer.The electric current that flows through electronic transformer must be more than or equal to it and keep the reliable and stable work of electric current guarantee electronic transformer, otherwise can make the desultory work of electronic transformer or not work, and occurs the phenomenon of LED flicker.Electronic transformer is in the application of the light fixtures such as MR16, and because MR16 belongs to pure resistive load, and the power ratio in when work is higher, can reach 50W, therefore and electronic transformer there is not compatibility issue.But when MR16 is replaced to LED, the power of LED work has greatly reduced, be all below 10W generally, and LED is not linear unit, input voltage must be greater than threshold voltage Vf just can have electric current to flow through LED, and this just causes when LED does not also have conducting, do not have electric current to flow through LED, also do not have electric current to flow through electronic transformer, electronic transformer just cannot normally be worked, the incompatible reason of LED application circuit and electronic transformer that Here it is.Be illustrated in figure 1 the Buck type LED drive circuit 1 of alternative MR16 commonplace in prior art, what by electronic transformer 112, export due to AC power 111 is the high frequency ac signal of 12vrms, therefore need to convert alternating voltage to direct voltage by rectification unit 113, the voltage of voltage input module 11 outputs is the commutating voltage after sinusoidal voltage rectification.Because Buck circuit has requirement for minimum operating voltage, voltage after rectification must be greater than the threshold voltage Vf of LED lamp string, therefore after voltage input module 11, must carry out filtering and improve minimum voltage by a larger electrochemical capacitor C of capacitance in parallel, exactly because the existence of this filter capacitor C, in a bit of time in twice power frequency period, this electrochemical capacitor C just can be filled, follow-up LED module 12 is powered by this electrochemical capacitor C or inductance L, other times voltage input module is not worked, and does not just have electric current to flow through from electronic transformer 112 yet.And must flowing through certain electric current (keeping electric current), electronic transformer 112 could keep normal operating conditions always, therefore the existence of larger filter capacitor C will cause electronic transformer 112 normally to work, there is intermittent output, practical manifestation out be exactly that LED module 12 is in constantly flicker.
Secondly, do not use jumbo electrochemical capacitor can bring the stability problem of LED constant current.Solve the compatibility issue of electronic transformer, just must avoid using jumbo electrochemical capacitor, if but electrochemical capacitor that need not be large, the later input voltage of rectification just there will be the low pressure that is low to moderate 0V, and due to the characteristic of electronic transformer, may there is the situation of less stable in its output voltage, and LED is a kind of current control device, needing circuit to regulate and control the electric current of LED, is generally the control mode of taking real-time constant current.Do not adopting large electrochemical capacitor or at input voltage less stable in the situation that, LED real-time current is less stable likely just, also just can not realize reliable constant current.
Finally, application cost problem.Also need to support in some applications controllable silicon dimmer, and controllable silicon dimmer there is the problem the same with electronic transformer, must ensure to be exactly greater than and keep the electric current of electric current to flow through the reliable and stable work of guarantee controllable silicon dimmer.In the scheme of more existing support controllable silicon dimmers, conventionally there are two kinds of solutions, a kind of is to connect a part of bleeder circuit in chip exterior, by bleeder circuit, guarantee that the electric current that flows through controllable silicon dimmer and electronic transformer is greater than its maintenance electric current, make it normal work, but this bleeder circuit need to increase many peripheral components, improved the cost of application system; Another kind is a special power tube to be set for leakage current in chip the inside, although this scheme has greatly reduced the cost of system peripherals device, need to have more a special power tube for earial drainage, causes the cost of chip to rise.
These three problems have greatly affected the development in existing LED Drive Control Technique field, are this field urgent problems.
Summary of the invention
The shortcoming of prior art in view of the above, the object of the present invention is to provide a kind of LED switch constant-current drive circuit, for solving the problems such as prior art LED drive circuit and controllable silicon dimmer and electronic transformer are incompatible, stability is not high, application cost is high.
For achieving the above object and other relevant objects, the invention provides a kind of LED switch constant-current drive circuit, described LED switch constant-current drive circuit at least comprises:
Voltage input module, described voltage input module comprises AC power, is connected in the controllable silicon dimmer of described AC power, the rectification unit that is connected in the electronic transformer of described controllable silicon dimmer and is connected in described electronic transformer output;
Inductance, is connected in the output of described voltage input module, for provide energy storage to load when input voltage is too low;
Diode, its anodic bonding is in described inductance, as fly-wheel diode;
LED module, is connected in the negative electrode of described diode, as load;
Power tube, its drain terminal is connected between described inductance and diode, source ground connection, by regulating switching frequency and/or the duty of the gate voltage of described power tube, recently adjust size of current, make the electric current that flows through described controllable silicon dimmer and electronic transformer be greater than its maintenance electric current separately, and realize the constant current of described LED module;
Detection module, is parallel to described Power Entry Module, detects the phase state of input voltage by described detection module;
Dimming controlling module, be connected in the output of described detection module and be connected with a reference voltage, for detection voltage and described reference voltage are made comparisons and exported comparative result, described detection voltage and described reference voltage are multiplied each other and exports new reference voltage simultaneously;
Error amplifier, is connected to described dimming controlling module and described LED module, the sampled voltage of the reference voltage of described dimming controlling module output and the output of described LED module is made comparisons, and export comparative result;
The lowest point testing circuit, is connected in the drain terminal of described power tube, for detection of the source-drain voltage of described power tube, regulates pwm signal that described power tube is opened during in the lowest point, the loss while reducing described power tube conducting at this voltage;
Pulse width modulation circuit, be connected in the output of described error amplifier and the lowest point testing circuit, by described error amplifier and the lowest point testing circuit acting in conjunction, produce pwm signal, the comparative result of described error amplifier output is controlled described pwm signal and is jumped to low level by high level, described in the output voltage control of described the lowest point testing circuit pwm signal by low transition to high level;
Control circuit, be connected in the output of described pulse width modulation circuit and described adjusting control circuit, according to the comparative result of described adjusting control circuit output, select output signal, when the comparative result of described adjusting control circuit output is low level, directly export high level signal, when the comparative result of described adjusting control circuit output is high level, output signal is followed the pwm signal of described pulse width modulation circuit output;
Drive circuit, is connected between described control circuit and the control end of described power tube, drives the gate voltage of described power tube by the output signal of described control circuit.
Preferably, described controllable silicon dimmer be forward position controllable silicon or after along controllable silicon.
Preferably, described rectification unit comprises two groups of diode groups in parallel, and each diode group comprises two diodes of series connection, and the two poles of the earth of described electronic transformer are connected between two diodes of each diode group.
Preferably, the voltage of described voltage input module output is the commutating voltage after sinusoidal voltage rectification.
Preferably, also comprise a filter capacitor, described filter capacitor one end is connected with the output of described voltage input module, other end ground connection.
Preferably, described detection module comprises at least 2 grades of divider resistances of series connection.
Preferably, described LED module comprises the LED lamp string that a plurality of LED lamps are composed in series, the sampling resistor of connecting with described LED lamp string, the other end ground connection of described sampling resistor, the filter capacitor in parallel with described LED lamp string and sampling resistor.
Preferably, also comprise a building-out capacitor, described building-out capacitor one end is connected with the output of described error amplifier, and other end ground connection, for stablizing the output voltage of described error amplifier.
Preferably, also comprise a building-out capacitor, described building-out capacitor one end is connected with the output of described detection module, and other end ground connection, for stablizing the output voltage of described detection module.
Preferably, the reference voltage that is connected in described dimming controlling module input is default definite value or changing value.
As mentioned above, LED switch constant-current drive circuit of the present invention, has following beneficial effect:
1, just can realization without jumbo electrochemical capacitor and the compatibility of controllable silicon dimmer and electronic transformer.
2, the constant current control stability of LED drive circuit is high.
3, without external special current by pass, also without built-in special earial drainage power tube, multiplexing unique high power valve,
Effectively reduce the cost of chip and system applies.
Accompanying drawing explanation
Fig. 1 is shown as Buck type LED drive circuit schematic diagram of the prior art.
Fig. 2 is shown as LED switch constant-current drive circuit schematic diagram of the present invention.
The controllable silicon dimmer that Fig. 3 to Fig. 8 is shown as LED switch constant-current drive circuit of the present invention is operated in the each point voltage waveform view in the situation of 100% duty ratio.
The controllable silicon dimmer that Fig. 9 to Figure 14 is shown as LED switch constant-current drive circuit of the present invention is operated in the each point voltage waveform view in the situation of certain duty ratio.
Element numbers explanation
1 Buck type LED drive circuit
11 Power Entry Modules
111 AC power
112 electronic transformers
113 rectification units
12 LED modules
2 LED switch constant-current drive circuits
21 voltage input modules
211 AC power
212 controllable silicon dimmers
213 electronic transformers
214 rectification units
22 LED modules
221 LED lamp strings
23 testing circuits
24 dimming controlling module
25 error amplifiers
26 the lowest point testing circuits
27 pulse width modulation circuits
28 control circuits
29 drive circuits
L inductance
D diode
M power tube
Embodiment
Below, by specific instantiation explanation embodiments of the present invention, those skilled in the art can understand other advantages of the present invention and effect easily by the disclosed content of this specification.The present invention can also be implemented or be applied by other different embodiment, and the every details in this specification also can be based on different viewpoints and application, carries out various modifications or change not deviating under spirit of the present invention.
Refer to Fig. 2 to Figure 14.It should be noted that, the diagram providing in the present embodiment only illustrates basic conception of the present invention in a schematic way, satisfy and only show with assembly relevant in the present invention in graphic but not component count, shape and size drafting while implementing according to reality, during its actual enforcement, kenel, quantity and the ratio of each assembly can be a kind of random change, and its assembly layout kenel also may be more complicated.
As shown in Figure 2, the invention provides a kind of LED switch constant-current drive circuit 2, described LED switch constant-current drive circuit 2 comprises: voltage input module 21; Inductance L; Diode D; LED module 22; Power tube M; Testing circuit 23; Dimming controlling module 24; Error amplifier 25; The lowest point testing circuit 26; Pulse width modulation circuit 27; Control circuit 28; Drive circuit 29.
As shown in Figure 2, described voltage input module 21 comprise AC power 211, be connected in the controllable silicon dimmer 212 of described AC power 211, the rectification unit 214 that is connected in the electronic transformer 213 of described controllable silicon dimmer 212 and is connected in described electronic transformer 213 outputs.
Described controllable silicon dimmer 212 can be that forward position controllable silicon can be also rear along controllable silicon, in the present embodiment, is preferably forward position controllable silicon.
Described rectification unit 214 comprises two groups of diode groups in parallel, and each diode group comprises two diodes of series connection, and the two poles of the earth of described electronic transformer 213 are connected between two diodes of each diode group.
After described voltage input module 21, filter capacitor can be connect, also filter capacitor can be do not connect.In the present embodiment, after described voltage input module 21, be connected with filter capacitor C1, described filter capacitor C1 one end is connected with the output of described voltage input module 21, and other end ground connection, for carrying out filtering to the voltage Vin of described voltage input module 21 outputs.
The voltage Vin of described voltage input module 21 outputs is the commutating voltage after sinusoidal voltage rectification.
As shown in Figure 2, described inductance L is connected in the output of described voltage input module 21, for provide energy storage to load LED lamp string 221 when input voltage vin is too low, guarantees the 221 constant current work of LED lamp string.
As shown in Figure 2, the anodic bonding of described diode D is between described inductance L and described LED module 22, as fly-wheel diode.
As shown in Figure 2, described LED module 22 is connected in the negative electrode of described diode D, as load.
Described LED module 22 comprises the LED lamp string 221 that a plurality of LED lamps are composed in series, the sampling resistor Rfb connecting with described LED lamp string 221, the other end ground connection of described sampling resistor Rfb, the filter capacitor C2 in parallel with described LED lamp string 221 and sampling resistor Rfb.In the present embodiment, the LED lamp that described LED lamp string 221 is 6 cascaded structures.
As shown in Figure 2, the drain terminal of described power tube M is connected between described inductance L and diode D, source ground connection, controlled by described drive circuit 29, by regulating switching frequency and/or the duty of the gate voltage Vg of described power tube M, recently adjust size of current, make the electric current that flows through described controllable silicon dimmer 212 and electronic transformer 213 be greater than its maintenance electric current separately, realize the constant current of described LED module 22 simultaneously.At described controllable silicon dimmer 212 and electronic transformer 213, do not play earial drainage effect normal work in the situation that, the in the situation that of described controllable silicon dimmer 212 and electronic transformer 213 normal work, play constant current effect.
As shown in Figure 2, described detection module 23 is parallel to described Power Entry Module 21, detects the phase state of input voltage vin by described detection module 21.
Described detection module 23 comprises at least two-stage divider resistance of series connection, and as shown in Figure 2, in the present embodiment, detection module is two-stage divider resistance R1 and the R2 being connected in series, and after R1 and R2 series connection, is parallel to described voltage input module 21.
The output of described detection module 23 is also connected with a building-out capacitor C3, and described building-out capacitor C3 other end ground connection, for stablizing the output voltage V dim of described detection module 23.
As shown in Figure 2, described dimming controlling module 24 is connected in the output of described detection module 23 and is connected with a reference voltage Vref, described reference voltage Vref is default definite value or changing value, described dimming controlling module 24 is made comparisons detection voltage and the described reference voltage Vref of described detection module 23 outputs, output comparative result is also transferred to described control circuit 28, described detection voltage Vdim and described reference voltage Vref is multiplied each other and obtains new reference voltage Vref 2 simultaneously.
As shown in Figure 2, described error amplifier 25 is connected to described dimming controlling module 24 and described LED module 22, and the reference voltage Vref 2 of described dimming controlling module 24 outputs is made comparisons with the sampled voltage Vfb of described LED module 22 outputs, and export comparative result Vcomp.
The output of described error amplifier 25 is also connected with a building-out capacitor C4, and described building-out capacitor C4 one end is connected with the output of described error amplifier, and other end ground connection, for stablizing the output voltage V comp of described error amplifier 25.
As shown in Figure 2, described the lowest point testing circuit 26 is connected in the drain terminal of described power tube M, for detection of the source-drain voltage of described power tube M, regulates during in the lowest point pwm signal that described power tube M is opened, the loss while reducing power tube M conducting at this voltage.
As shown in Figure 2, described pulse width modulation circuit 27 is connected in the output of described error amplifier 25 and the lowest point testing circuit 26, by described error amplifier 25 and 26 actings in conjunction of the lowest point testing circuit, produce pwm signal, the output voltage V comp of described error amplifier 25 controls described pwm signal and jumps to low level by high level, described in the output voltage control of described the lowest point testing circuit 26 pwm signal by low transition to high level.
As shown in Figure 2, described control circuit 28 is connected in the output of described pulse width modulation circuit 27 and described adjusting control circuit 24, according to the comparative result Vdimo of described adjusting control circuit 24 outputs, select output signal, when the comparative result Vdimo of described adjusting control circuit output is low level, directly export high level signal, when the comparative result Vdimo of described adjusting control circuit output is high level, output signal is followed the pwm signal of described pulse width modulation circuit 27 outputs.
As shown in Figure 2, described drive circuit 29 is connected between described control circuit 28 and the control end of described power tube M, by the gate voltage Vg of power tube M described in the signal driver of described control circuit 28 outputs.
The operation principle of above-mentioned LED switch constant-current drive circuit 2 is as follows:
Do not connect the situation that controllable silicon dimmer 212 or controllable silicon dimmer 212 are operated in 100% duty ratio.After the normal work of internal power source voltage, voltage input module 21 output adjustable input voltage Vin, as shown in Figure 3, input voltage vin is the commutating voltage after sinusoidal voltage rectification, take front half period of sinusoidal voltage is one-period output.Alternating voltage is through controllable silicon dimmer 212, electronic transformer 213 and rectification unit 214 outputs, the detection voltage Vdim that resistance R 1 and R2 dividing potential drop by detection module 23 obtains reacting input voltage vin phase state again, building-out capacitor C3 is by the high frequency burr filtering of Vdim.Because do not connect controllable silicon dimmer 212 or controllable silicon dimmer 212 is normally worked, so the DIM end most of the time is in higher current potential, the comparative result Vdimo that makes dimming controlling module 24 outputs is also high level, as shown in Figure 4, and the high signal that Vdimo is 5V.The pwm signal that now the output signal afterpulsing width modulation circuit 27 of control circuit 28 is exported, power tube M plays constant current effect.The result that another output signal Vref2 of dimming controlling module 24 multiplies each other for detecting voltage Vdim and reference voltage Vref, Vref can be that definite value can be also changing value, in the situation that Vdim is high level, Vref2 equals reference voltage Vref, as shown in Figure 5, reference voltage Vref 2 is that reference voltage Vref is definite value.The electric current that flows through LED lamp string 221 is converted to sampled voltage Vfb on sampling resistor Rfb, and as shown in Figure 5, Vfb is the signal changing with input voltage vin amplitude.Together with the Vref2 that this voltage is exported with dimming controlling module 24 simultaneously, be input to positive and negative two inputs of error amplifier 25, error amplifier 25 compares two signals, obtain comparative result Vcomp, the external building-out capacitor C4 of output COMP of error amplifier 25, loop is compensated for voltage stabilizing, and also has filter action, shown in Fig. 6, Vcomp keeps constant within twice power frequency period or longer cycle time, thereby make two input signal Vref2 of error amplifier 25 and the mean value of Vfb realize dynamic following, as shown in Figure 5, Vref2 is constant, Vfb is variable, in average, Vref2 and Vfb are consistent.The lowest point testing circuit 26 receives signal from the drain terminal SW of power tube M, when the drain terminal voltage of power tube M is during lower than set point, sending control signal, to make pwm signal saltus step be high level, with this, open power tube M, raise the drain terminal voltage of power tube M, loss while reducing power tube M conducting, the control signal of the lowest point testing circuit 26 outputs is input to pulse width modulation circuit 27 and produces pwm signal together with Vcomp, wherein voltage Vcomp controls pwm signal and jumps to low level by high level, the control signal of the lowest point testing circuit 26 output control pwm signal by low transition to high level.Pwm signal obtains the gate voltage Vg of power tube M after control circuit 28 and drive circuit 29, and as shown in Figure 7, the gate voltage Vg of power tube M is the switching signal with certain duty ratio.Frequency and the duty ratio of this voltage and pwm signal are basically identical, thus the on off state of power ratio control pipe M, and the electric current that LED module 22 is flow through in adjustment is to reach the object of constant current.As shown in Figure 8, idis is the discharging current of inductance, iL is inductive current waveform, and inductance L is constantly doing the action discharging and recharging, after system stability, variation along with input voltage, Vcomp remains a constant voltage, and it is constant that the ON time of the power tube being determined by this voltage also can keep, therefore within the time of single work period, the average current of inductance, namely the average current of power tube and input voltage remain a linearity or approach linear relation.The final effect that realizes of whole loop is the electric current I led=Vref/Rfb that keeps flowing through LED lamp.
In the situation that controllable silicon dimmer 212 is operated in certain duty ratio D1, after the normal work of internal power source voltage, voltage input module 21 output adjustable input voltage Vin, input voltage vin is the commutating voltage after sinusoidal voltage rectification, take front half period of sinusoidal voltage is one-period output, as shown in Figure 9, and when alternating voltage is less, flow through controllable silicon dimmer 212 undercurrent so that its normally work, so output voltage is 0V; When alternating voltage increases, the electric current that flows through controllable silicon dimmer 212 is enough to make it normally to work, and output voltage moment uprises.Alternating voltage is through controllable silicon dimmer 212, electronic transformer 213 and rectification unit 214 outputs, the detection voltage Vdim that resistance R 1 and R2 dividing potential drop by detection module 23 obtains reacting input voltage phase state again, building-out capacitor C3 is by the high frequency burr filtering of Vdim.Because controllable silicon dimmer 212 is with the state work of duty ratio D1, so the waveform of Vdim is also rendered as the pulse signal of duty ratio D1, detect voltage Vdim through described adjusting control circuit 24 and reference voltage Vref comparison, the comparative result Vdimo obtaining is also that duty ratio is the synchronous pulse signal of same frequency of D1, as shown in figure 10, Vdimo is within 0 o'clock, to be low level in input voltage vin, and after input voltage vin raises, saltus step is high level.When Vdimo is low level, control circuit 28 is directly exported high level, then by drive circuit 29, the gate voltage Vg of power tube M is drawn high, and makes power tube M conducting, and now power tube M plays earial drainage effect; When Vdimo is high level, the pwm signal of output signal afterpulsing width modulation circuit 27 outputs of control circuit 28, power tube M plays constant current effect.As shown in figure 13, in the situation that controllable silicon dimmer 212 is not normally worked, the gate voltage of power tube M is high level, in conducting state; The in the situation that of controllable silicon dimmer 212 normal work, the gate voltage of power tube M is the switching signal of following pwm signal.The result that another output signal Vref2 of dimming controlling module 24 multiplies each other for detecting voltage Vdim and reference voltage Vref, Vref can be that definite value can be also changing value, Vref2 be with detect voltage Vdim same frequency, with the pulse signal of reference voltage Vref with amplitude, be the waveform schematic diagram of reference voltage Vref 2 in one-period as shown in figure 11, when Vdim is low level, Vref2 is 0; When Vdim is high level, Vref2 equals Vref.The electric current that flows through LED lamp string 221 is converted to sampled voltage Vfb on sampling resistor Rfb, and as shown in figure 11, the mean value of Vfb and Vref2 is realized dynamic following within twice power frequency period or longer cycle time, and in average, Vref2 and Vfb are consistent.Vfb and Vref2 are input to positive and negative two inputs of error amplifier 25 simultaneously, error amplifier 25 compares two signals, obtain comparative result Vcomp, the external building-out capacitor C4 of output COMP of error amplifier 25, loop is compensated for voltage stabilizing, and also have filter action, shown in Figure 12, Vcomp keeps constant within twice power frequency period or longer cycle time, and this value is less than the amplitude in duty ratio 100% situation.The lowest point testing circuit 26 receives signal and after processing, be input to pulse width modulation circuit 27 generation pwm signals together with Vcomp from the drain terminal SW of power tube M, wherein voltage Vcomp controls pwm signal and jumps to low level by high level, the lowest point testing circuit 26 control pwm signals by low transition to high level.Pwm signal obtains the gate voltage Vg of power tube M after control circuit 28 and drive circuit 29, and as shown in figure 13, while detecting voltage Vdim low level, the gate voltage Vg of power tube M is high; While detecting voltage Vdim high level, gate voltage Vg and the pwm signal of power tube M are consistent, frequency and the duty ratio of this voltage and pwm signal are basically identical, thus the on off state of power ratio control pipe M, and the electric current that LED module 22 is flow through in adjustment is to reach the object of constant current.As shown in figure 14, when controllable silicon dimmer 212 is idle, do not have electric current to flow through inductance L, after the normal work of controllable silicon dimmer 212, electric current flows through inductance L, after system stability, in the time of single work period, the average current of inductance and input voltage remain a linearity or approach linear relation simultaneously.The final effect that realizes of whole loop is the electric current that keeps flowing through LED lamp
More than that single cycle 10ms is with the interior course of work.Other time is the work in this cycle of repetition.
In sum, LED switch constant-current drive circuit 2 of the present invention flows through the current average of inductance L and keeps linear or approach linear relation with the input voltage vin after rectification unit 214 by controlling single switch in the cycle, by loop, controlled and made twice power frequency period or more the LED average current maintenance of large period in the time is constant; Simultaneously by detecting the phase state of the input voltage vin after rectification, convert the pulse signal Vdimo of the corresponding duty ratio of same frequency to, when controllable silicon dimmer 212 is closed, this pulse signal is low level, when controllable silicon dimmer 212 is opened, this pulse signal is high level, and then go anode input or the negative terminal of departure amplifier 25 to input or output with this signal, and then the LED electric current average output current of LED being modulated into while there is no light modulation scheme by loop is multiplied by the duty ratio of light modulation pulse signal, thereby realize light modulation.The Vdimo generating is imported in logic control circuit, when Vdimo is low level, the gate voltage of power tube is set high to power tube conducting; When Vdimo is high level, the pwm signal that the gate voltage of power tube is produced by constant current loop determines.LED switch constant-current drive circuit of the present invention 2 adopts Boost frameworks, just can compatible silicon controlled dimmer and electronic transformer without jumbo electrochemical capacitor, and realize stable constant current and control; In addition,, without external current by pass, also without built-in special earial drainage power tube, multiplexing unique high power valve completes the function of earial drainage and constant current simultaneously, can effectively reduce the cost of chip and system applies.So the present invention has effectively overcome various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all can, under spirit of the present invention and category, modify or change above-described embodiment.Therefore, such as in affiliated technical field, have and conventionally know that the knowledgeable, not departing from all equivalence modifications that complete under disclosed spirit and technological thought or changing, must be contained by claim of the present invention.
Claims (10)
1. a LED switch constant-current drive circuit, is characterized in that, described LED switch constant-current drive circuit at least comprises:
Voltage input module, described voltage input module comprises AC power, is connected in the controllable silicon dimmer of described AC power, the rectification unit that is connected in the electronic transformer of described controllable silicon dimmer and is connected in described electronic transformer output;
Inductance, is connected in the output of described voltage input module, for provide energy storage to load when input voltage is too low;
Diode, its anodic bonding is in described inductance, as fly-wheel diode;
LED module, is connected in the negative electrode of described diode, as load;
Power tube, its drain terminal is connected between described inductance and diode, source ground connection, by regulating switching frequency and/or the duty of the gate voltage of described power tube, recently adjust size of current, make the electric current that flows through described controllable silicon dimmer and electronic transformer be greater than its maintenance electric current separately, and realize the constant current of described LED module;
Detection module, is parallel to described Power Entry Module, detects the phase state of input voltage by described detection module;
Dimming controlling module, be connected in the output of described detection module and be connected with a reference voltage, for detection voltage and described reference voltage are made comparisons and exported comparative result, described detection voltage and described reference voltage are multiplied each other and exports new reference voltage simultaneously;
Error amplifier, is connected to described dimming controlling module and described LED module, the sampled voltage of the reference voltage of described dimming controlling module output and the output of described LED module is made comparisons, and export comparative result;
The lowest point testing circuit, is connected in the drain terminal of described power tube, for detection of the source-drain voltage of described power tube, regulates pwm signal that described power tube is opened during in the lowest point, the loss while reducing described power tube conducting at this voltage;
Pulse width modulation circuit, be connected in the output of described error amplifier and the lowest point testing circuit, by described error amplifier and the lowest point testing circuit acting in conjunction, produce pwm signal, the comparative result of described error amplifier output is controlled described pwm signal and is jumped to low level by high level, described in the output voltage control of described the lowest point testing circuit pwm signal by low transition to high level;
Control circuit, be connected in the output of described pulse width modulation circuit and described adjusting control circuit, according to the comparative result of described adjusting control circuit output, select output signal, when the comparative result of described adjusting control circuit output is low level, directly export high level signal, when the comparative result of described adjusting control circuit output is high level, output signal is followed the pwm signal of described pulse width modulation circuit output;
Drive circuit, is connected between described control circuit and the control end of described power tube, drives the gate voltage of described power tube by the output signal of described control circuit.
2. LED switch constant-current drive circuit according to claim 1, is characterized in that: described controllable silicon dimmer be forward position controllable silicon or after along controllable silicon.
3. LED switch constant-current drive circuit according to claim 1, it is characterized in that: described rectification unit comprises two groups of diode groups in parallel, each diode group comprises two diodes of series connection, and the two poles of the earth of described electronic transformer are connected between two diodes of each diode group.
4. LED switch constant-current drive circuit according to claim 1, is characterized in that: the voltage of described voltage input module output is the commutating voltage after sinusoidal voltage rectification.
5. LED switch constant-current drive circuit according to claim 1, is characterized in that: also comprise a filter capacitor, described filter capacitor one end is connected with the output of described voltage input module, other end ground connection.
6. LED switch constant-current drive circuit according to claim 1, is characterized in that: described detection module comprises at least 2 grades of divider resistances of series connection.
7. LED switch constant-current drive circuit according to claim 1, is characterized in that: described LED module comprises the LED lamp string that a plurality of LED lamps are composed in series; With the sampling resistor that described LED lamp string is connected, the other end ground connection of described sampling resistor; The filter capacitor in parallel with described LED lamp string and sampling resistor.
8. LED switch constant-current drive circuit according to claim 1, it is characterized in that: also comprise a building-out capacitor, described building-out capacitor one end is connected with the output of described error amplifier, and other end ground connection, for stablizing the output voltage of described error amplifier.
9. LED switch constant-current drive circuit according to claim 1, is characterized in that: also comprise a building-out capacitor, described building-out capacitor one end is connected with the output of described detection module, and other end ground connection, for stablizing the output voltage of described detection module.
10. LED switch constant-current drive circuit according to claim 1, is characterized in that: the reference voltage that is connected in described dimming controlling module input is default definite value or changing value.
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| CN201310705124.5A CN103648219B (en) | 2013-12-19 | 2013-12-19 | Light-emitting diode (LED) switch constant-current driving circuit |
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