CN204377179U - Light emitting element driver and controller thereof - Google Patents
Light emitting element driver and controller thereof Download PDFInfo
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- CN204377179U CN204377179U CN201420339393.4U CN201420339393U CN204377179U CN 204377179 U CN204377179 U CN 204377179U CN 201420339393 U CN201420339393 U CN 201420339393U CN 204377179 U CN204377179 U CN 204377179U
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Abstract
A light emitting element driver and a controller thereof are disclosed. The controller includes a reference signal generating circuit that receives the dimming signal and the thermal sensing signal and converts the dimming signal and the thermal sensing signal into a dimming conversion signal and a thermal sensing conversion signal, respectively. The reference signal generating circuit selects a smaller value of the dimming conversion signal and the thermal sensing conversion signal and generates a reference signal according to the smaller value. The reference signal reflects dimming information on one hand and can realize the dimming function; on the other hand, the temperature of the light-emitting element is monitored, and the light-emitting element can be prevented from overheating.
Description
Technical field
The utility model relates to electronic circuit, particularly relates to light emitting element driver and controller thereof.
Background technology
At lighting field, need to carry out light modulation to light-emitting component on the one hand; On the other hand, need to monitor the temperature of light-emitting component, prevent light-emitting component from crossing cause thermal damage.Therefore, the utility model proposes a kind of circuit, above-mentioned two functions can be realized simultaneously.
Utility model content
For problems of the prior art, the purpose of this utility model is to provide light emitting element driver and the controller thereof that can carry out light modulation and temperature monitoring.
According to a kind of controller for light emitting element driver of the utility model embodiment, light emitting element driver comprises power converter, and power converter provides drive current to light-emitting component.This controller comprises reference signal generation circuit and control circuit.This reference signal generation circuit comprises: dim signal converting unit, has input and output, and wherein input receives dim signal, and produces light modulation switching signal according to dim signal at output; Thermoinduction signal conversion unit, has input and output, and wherein input receives thermoinduction signal, and produces thermoinduction switching signal according to thermoinduction signal at output; And selected cell, there is first input end, the second input and output, wherein first input end is coupled to dim signal converting unit to receive light modulation switching signal, second input is coupled to thermoinduction signal conversion unit to receive thermoinduction switching signal, and produces reference signal according to the smaller value in light modulation switching signal and thermoinduction switching signal at output.This control circuit has first input end, the second input and output, wherein first input end is coupled to reference signal generation circuit to receive reference signal, second input receives the feedback signal representing drive current, and this control circuit produces control signal to control power converter according to reference signal and feedback signal at output.
A kind of for driving the driver of light-emitting component according to the utility model embodiment, comprises controller and power converter.This controller comprises reference signal generation circuit and control circuit.This reference signal generation circuit comprises: dim signal converting unit, has input and output, and wherein input receives dim signal, and produces light modulation switching signal according to dim signal at output; Thermoinduction signal conversion unit, has input and output, and wherein input receives thermoinduction signal, and produces thermoinduction switching signal according to thermoinduction signal at output; And selected cell, there is first input end, the second input and output, wherein first input end is coupled to dim signal converting unit to receive light modulation switching signal, second input is coupled to thermoinduction signal conversion unit to receive thermoinduction switching signal, and produces reference signal according to the smaller value in light modulation switching signal and thermoinduction switching signal at output.This control circuit has first input end, the second input and output, wherein first input end is coupled to reference signal generation circuit to receive reference signal, second input receives the feedback signal representing drive current, and produces control signal to control power converter according to reference signal and feedback signal at output.This power converter receives input voltage and provides drive current to light-emitting component.
According to a kind of controller for light emitting element driver of the utility model embodiment, light emitting element driver comprises power converter, and power converter provides drive current to light-emitting component.This controller comprises reference signal generation circuit and control circuit.This reference signal generation circuit comprises: dim signal converting unit, has input and output, and wherein input receives dim signal, and produces light modulation switching signal according to dim signal at output; And selected cell, there is first input end, the second input and output, wherein first input end is coupled to dim signal converting unit to receive light modulation switching signal, second input receives thermoinduction signal, and produces reference signal according to the smaller value in light modulation switching signal and thermoinduction signal at output.This control circuit has first input end, the second input and output, wherein first input end is coupled to reference signal generation circuit to receive reference signal, second input receives the feedback signal representing drive current, and produces control signal to control power converter according to reference signal and feedback signal at output.
According to a kind of controller for light emitting element driver of the utility model embodiment, light emitting element driver comprises power converter, and power converter provides drive current to light-emitting component.This controller comprises reference signal generation circuit and control circuit.This reference signal generation circuit comprises: thermoinduction signal conversion unit, has input and output, and wherein input receives thermoinduction signal, and produces thermoinduction switching signal according to thermoinduction signal at output; And selected cell, there is first input end, the second input and output, wherein first input end is coupled to thermoinduction signal conversion unit to receive thermoinduction switching signal, second input receives dim signal, and produces reference signal according to the smaller value in dim signal and thermoinduction switching signal at output.This control circuit has first input end, the second input and output, wherein first input end is coupled to reference signal generation circuit to receive reference signal, second input receives the feedback signal representing drive current, and produces control signal to control power converter according to reference signal and feedback signal at output.
According to a kind of controller for light emitting element driver of the utility model embodiment, light emitting element driver comprises power converter, and power converter provides drive current to light-emitting component.This controller comprises reference signal generation circuit and control circuit.This reference signal generation circuit comprises: thermoinduction signal conversion unit, receives thermoinduction signal, and produces thermoinduction switching signal according to thermoinduction signal; And selected cell, be coupled to thermoinduction signal conversion unit to receive thermoinduction switching signal and to receive dim signal, and produce reference signal according to the smaller value in dim signal and thermoinduction switching signal.This control circuit receives reference signal and represents the feedback signal of drive current, and produces control signal to control power converter according to reference signal and feedback signal.
According to a kind of controller for light emitting element driver of the utility model embodiment, light emitting element driver comprises power converter, and power converter provides drive current to light-emitting component.This controller comprises: selected cell, there is first input end, the second input and output, wherein first input end receives dim signal, and the second input receives thermoinduction signal, and produces reference signal according to the smaller value in dim signal and thermoinduction signal at output; And control circuit, there is first input end, the second input and output, wherein first input end is coupled to reference signal generation circuit to receive reference signal, second input receives the feedback signal representing drive current, and produces control signal to control power converter according to reference signal and feedback signal at output.
In embodiment of the present utility model, light emitting element driver and controller thereof can realize the function of light modulation on the one hand; The monitoring to light-emitting component temperature can be realized on the other hand, light-emitting component can be prevented overheated.
Accompanying drawing explanation
Fig. 1 illustrates the schematic diagram of the light emitting element driver 100 according to the utility model embodiment;
Fig. 2 A illustrates the reference signal generation circuit 20A according to the utility model embodiment;
Fig. 2 B illustrates the reference signal generation circuit 20B according to the utility model embodiment;
Fig. 3 illustrates the circuit diagram of the light emitting element driver 300 according to the utility model embodiment;
Fig. 4 A ~ 4C illustrates the work wave schematic diagram of reference signal generation circuit 320;
Embodiment
To specific embodiment of the utility model be described in detail below, it should be noted that the embodiments described herein is only for illustrating, is not limited to the utility model.In the following description, in order to provide thorough understanding of the present utility model, a large amount of specific detail has been set forth.But, those of ordinary skill in the art be it is evident that: these specific detail need not be adopted to carry out the utility model.In other instances, in order to avoid obscuring the utility model, do not specifically describe known circuit or material.
In whole specification, " embodiment ", " embodiment ", " example " or mentioning of " example " are meaned: the special characteristic, structure or the characteristic that describe in conjunction with this embodiment or example are comprised at least one embodiment of the utility model.Therefore, the phrase " in one embodiment " occurred in each place of whole specification, " in an embodiment ", " example " or " example " differ to establish a capital and refer to same embodiment or example.In addition, can with any combination suitably and or sub-portfolio by specific feature, structure or property combination in one or more embodiment or example.In addition, it should be understood by one skilled in the art that the diagram provided at this is all for illustrative purposes, and diagram is not necessarily drawn in proportion.Should be appreciated that when claim " element " " be connected to " or " coupling " to another element time, it can be directly connected or coupled to another element or can there is intermediary element.On the contrary, when claim element " be directly connected to " or " being directly coupled to " another element time, there is not intermediary element.Identical Reference numeral indicates identical element.Term "and/or" used herein comprises any and all combinations of one or more relevant project listed.
Fig. 1 illustrates the schematic diagram of the light emitting element driver 100 according to the utility model embodiment.As shown in Figure 1, light emitting element driver 100 comprises power converter 101 and controller 102.Wherein, controller 102 comprises reference signal generation circuit 120 and control circuit 130.
Reference signal generation circuit 120 comprises dim signal converting unit 121, thermoinduction signal conversion unit 122 and selected cell 123.Dim signal converting unit 121 receives the dim signal VDIM being used for regulating light-emitting component 103 brightness, and dim signal VDIM is converted to light modulation switching signal VDIM '.Proportional between light modulation switching signal VDIM ' and dim signal VDIM, there is the first scale factor K 1, i.e. VDIM '=K1 × VDIM.In one embodiment, K1=1, light modulation switching signal VDIM ' is identical with dim signal VDIM.In this embodiment, dim signal converting unit 121 can be gain be 1 circuit unit, such as wire.In one embodiment, dim signal VDIM is an external direct voltage.
Thermoinduction signal conversion unit 122 receives the thermoinduction signal VNTC being used for monitoring light-emitting component 103 temperature, and thermoinduction signal VNTC is converted to thermoinduction switching signal VNTC '.Proportional between thermoinduction switching signal VNTC ' and thermoinduction signal VNTC, there is the second scale factor K 2, i.e. VNTC '=K2 × VNTC.In one embodiment, K2=1, thermoinduction switching signal VNTC ' are identical with thermoinduction signal VNTC.In this embodiment, thermoinduction signal conversion unit 122 can be gain be 1 circuit unit, such as wire.In one embodiment, thermoinduction signal VNTC can be provided by the series circuit of a current source and a thermistor.Particularly, current source provides electric current to flow through thermistor, and the resistance value of thermistor changes along with the variations in temperature of light-emitting component, and the voltage at thermistor two ends is thermoinduction signal VNTC.
In one embodiment, light modulation switching signal VDIM ' and thermoinduction switching signal VNTC ' can be the signal of voltage signal, current signal or other type.
Selected cell 123 is coupled to dim signal converting unit 121 and thermoinduction signal conversion unit 122 to receive light modulation switching signal VDIM ' and thermoinduction switching signal VNTC ' respectively, and select the smaller value in light modulation switching signal VDIM ' and thermoinduction switching signal VNTC ', selected cell 123 exports reference signal VREF according to this smaller value.In one embodiment, selected cell 123 directly can export this smaller value as reference signal.Such as, light modulation switching signal VDIM ' and thermoinduction switching signal VNTC ' is voltage signal, and selected cell 123 directly selects the signal signal VREF as the reference voltage that wherein magnitude of voltage is less.In another embodiment, the smaller value of selection can carry out changing rear output as with reference to signal VREF by selected cell 123, proportional between reference signal VREF and this smaller value.Such as, light modulation switching signal VDIM ' and thermoinduction switching signal VNTC ' is current signal, and selected cell 123 selects the current signal that wherein current value is less, exports after being then converted into magnitude of voltage, as the reference voltage signal VREF.
In one embodiment, between the first scale factor K 1 and the second scale factor K 2, there is following relation.Suppose that the light modulation switching signal VDIM ' that dim signal VDIM obtains after dim signal converting unit 121 is changed has maximum VDIM ' _ MAX, the thermoinduction switching signal VNTC ' that thermoinduction signal VNTC obtains after dim signal converting unit 121 is changed has maximum VNTC ' _ MAX.First scale factor K 1 and the second scale factor K 2 should make VDIM ' _ MAX=VNTC ' _ MAX, i.e. K1 × VDIM_M=K2 × VNTC_M, and wherein, VDIM_M and VNTC_M is respectively the maximum rating of dim signal VDIM and thermoinduction signal VNTC.Therefore, K1/K2=VNTC_M/VDIM_M.
Power converter 101 receives input voltage VIN, and input voltage VIN is converted to drive current ILED to be provided to light-emitting component 103.In one embodiment, power converter 101 can adopt any DC-DC or ac/dc transformation topology structure, such as synchronous or asynchronous buck converter or booster converter, and normal shock, anti exciting converter etc.In another embodiment, light-emitting component 103 can be the parallel-connection structure of single light-emitting diode (LED), LED strip connection syndeton or multiple LED strip.
Control circuit 130 receives reference signal VREF and represents the feedback signal VFB of drive current ILED, and produces control signal CTRL to control power converter 101 according to reference signal VREF and feedback signal VFB.In one embodiment, control circuit 130 can adopt pulse width modulation (PWM) mode or pulse frequency modulated (PFM) mode.Control circuit 130 can adopt Controlled in Current Mode and Based, as peak-current mode controls or average Controlled in Current Mode and Based, or the control method such as voltage mode control.
Fig. 2 A illustrates the reference signal generation circuit 20A according to the utility model embodiment.As shown in Figure 2 A, reference signal generation circuit 20A comprises dim signal converting unit 201, thermoinduction signal conversion unit 202 and selected cell 203.Dim signal converting unit 201 comprises amplifier AMP1, buffer BUF1, resistor R1 and resistor R3.Amplifier AMP1 has first input end, the second input, the 3rd input and output, and wherein, first input end receives dim signal VDIM, and the second input receives dim signal first threshold values VDH, and the 3rd input is coupled to its output.Resistor R1 has first end and the second end, and its first end is coupled to the output of amplifier AMP1.。Buffer BUF1 has first input end, the second input and output, and wherein, first input end receives dim signal second threshold values VDL, and its output is coupled to second end of the second input and resistor R1.Resistor R3 has first end and the second end, and its first end is coupled to the first end of resistor R1 to receive the first electric current I 1 flowing through resistor R1, and its second end is coupled to reference to ground.The first end of resistor R3, as the output of dim signal converting unit 201, provides light modulation switching signal VDIM ', and it flows through the voltage that resistor R3 produces for the first electric current I 1.During work, when dim signal VDIM is less than threshold values VDL, electric current I 1 is 0; When dim signal VDIM is greater than threshold values VDL and is less than threshold values VDH, electric current I 1 is (VDIM-VDL)/R1; When dim signal VDIM is greater than threshold values VDH, electric current I 1 has maximum, is (VDH-VDL)/R1.
Thermoinduction signal conversion unit 202 comprises amplifier AMP2, buffer BUF2, resistor R2 and resistor R4.Amplifier AMP2 has first input end, the second input, the 3rd input and output, and wherein, first input end receives thermoinduction signal VNTC, and the second input receives thermoinduction signal first threshold values VNH, and the 3rd input is coupled to its output.Resistor R2 has first end and the second end, and its first end is coupled to the output of amplifier AMP2.Buffer BUF2 has first input end, the second input and output, and wherein, first input end receives thermoinduction signal second threshold values VNL, and its output is coupled to second end of the second input and resistor R2.Resistor R4 has first end and the second end, and its first end is coupled to the first end of resistor R2 to receive the electric current I 2 flowing through resistor R2, and its second end is coupled to reference to ground.The first end of resistor R4, as the output of thermoinduction signal conversion unit 202, provides thermoinduction switching signal VNTC ', and it flows through the voltage that resistor R4 produces for the second electric current I 2.During work, when thermoinduction signal VNTC is less than threshold values VNL, electric current I 2 is 0; When thermoinduction signal VNTC is greater than threshold values VNL and is less than threshold values VNH, electric current I 2 is (VNTC-VNL)/R2; When thermoinduction signal VNTC is greater than threshold values VNH, electric current I 2 has maximum, is (VNH-VNL)/R2.
In one embodiment, the resistance of resistor R1 ~ R4 is chosen and should be made light modulation switching signal VDIM ' and thermoinduction switching signal VNTC
'maximum equal, namely
Therefore,
Get in the embodiment of equal value at R3 and R4, have
Selected cell 203 is coupled to light modulation converting unit 201 and thermoinduction converting unit 202 to receive light modulation switching signal VDIM ' and thermoinduction switching signal VNTC ' respectively.Selected cell 203 selects the smaller value in light modulation switching signal VDIM ' and thermoinduction switching signal VNTC ', and exports this smaller value as reference signal VREF.
Fig. 2 B illustrates the reference signal generation circuit 20B according to the utility model embodiment.Similar with Fig. 2 A, in fig. 2b, dim signal converting unit 201 comprises amplifier AMP1, buffer BUF1 and resistor R1, thermoinduction signal conversion unit 202 comprises amplifier AMP2, buffer BUF2 and resistor R2, and element has identical syndeton and operation principle shown in said elements and Fig. 2 A, for avoiding tired stating, be not described in detail herein.Be outside different with Fig. 2 A, the selected cell 203 shown in Fig. 2 B is coupled to dim signal converting unit 201 and thermoinduction signal conversion unit 202 with received current I1 and I2 respectively, and selects smaller value in electric current I 1 and I2 as with reference to current signal IREF.And selected cell 203 also comprises selects resistor R5, and reference current signal IREF flows through and selects resistor R5, is reference signal VREF at the voltage selecting resistor R5 two ends to produce.
Fig. 3 illustrates the circuit diagram of the light emitting element driver 300 according to the utility model embodiment.Light emitting element driver 300 shown in Fig. 3 is for driving light-emitting component 303.As shown in Figure 3, light-emitting component 303 comprises LED strip, and it has first end and the second end.Light emitting element driver 300 comprises power converter 301, controller 302, feedback circuit 304 and current detection circuit 305.
Power converter 301 adopts synchronous buck structure, comprises switching tube M1, lower switching tube M2, inductor L and capacitor C.Input voltage VIN, by the conducting of upper switching tube M1 and lower switching tube M2 and shutoff, is converted to drive current ILED by power converter 301.Upper switching tube M1 has first end, the second end and control end, and its first end receives input voltage VIN.Lower switching tube M2 has first end, the second end and control end, and its first end is coupled to second end of switching tube M1, and its second end is coupled to reference to ground.Inductor L has first end and the second end, and its first end is coupled to the common port of switching tube M1 and lower switching tube M2.Capacitor C is coupled between second end of inductor L and reference ground.The common port of capacitor C and inductor L, as the output of power converter 301, is coupled to the first end of light-emitting component 303 to provide drive current ILED.
In one embodiment, upper switching tube M1 in power converter 301 and lower switching tube M2 can be any controllable semiconductor switch device, such as mos field effect transistor (MOSFET), igbt (IGBT) etc.In another embodiment, lower switching tube M2 can be replaced by other continued flow component, as diode.
Feedback circuit 304 comprises resistor RFB.Resistor RFB has first end and the second end, and its first end is coupled to the second end of light-emitting component 303 and provides feedback signal VFB, and its second end is connected to reference to ground.
Current detection circuit 305 comprises resistor RCS and amplifier AMP.Resistor RCS has first end and the second end, and its first end receives input voltage VIN, and its second end is coupled to the first end of switching tube M1.Amplifier AMP has first input end, the second input and output, its first input end is coupled to the first end of resistor RCS, its second input is coupled to second end of resistor RCS, and amplifier AMP amplifies the voltage at resistor RCS two ends and provides current detection signal Ss at its output.Those skilled in the art should be realized that, in another embodiment, resistor RCS can be the some resistance when inductive current rises or decline among the path that flows through, the sampling resistor be such as in series with inductance L, upper switching tube M1 or lower switching tube M2, the conducting resistance of upper switching tube M1 or lower switching tube M2, etc.In another embodiment, current detection circuit 305 accessible site is in controller 302.
Controller 302 adopts peak-current mode to control, and comprises reference signal generation circuit 320, error amplifier EA, comparator CMP, clock signal generating circuit CLG and logical circuit LOG.Reference signal generation circuit 20A shown in reference signal generation circuit 320 and Fig. 2 A has similar circuit structure, is not repeated herein.Error amplifier EA has first input end, the second input and output.Wherein, first input end is coupled to feedback circuit 304 with receiving feedback signals VFB, and the second input is coupled to reference signal generation circuit 320 to receive reference signal VREF.Error amplifier EA amplifies difference between reference signal VREF and feedback signal VFB and at its output output error signal Verr.Comparator CMP has first input end, the second input and output.Wherein, first input end is coupled to current detection circuit 305 with received current detection signal Ss, and the second input is coupled to the output of error amplifier EA to receive error signal Verr.Current detection signal Ss and error signal Verr compares by comparator CMP, and produces comparison signal SET at its output.Clock signal generating circuit CLG clocking CLK.Logical circuit LOG has first input end, the second input, the first output and the second output.Wherein, first input end is coupled to clock signal generating circuit CLG with receive clock signal CLK, second input is coupled to the output of comparison circuit CMP to receive comparison signal SET, logical circuit LOG produces control signal Q and Q ' according to clock signal clk and comparison signal SET respectively at its first output and the second output, to be provided to the control end of upper switching tube M1 and lower switching tube M2 respectively.
When the rising edge of clock signal clk arrives, clock signal clk set logic circuit LOG, logical circuit LOG export control signal Q and Q ' to make upper switching tube M1 conducting, lower switching tube M2 turns off.Drive current ILED flows through the resistor RFB in feedback circuit 304, produces feedback signal VFB.Error amplifier EA amplifies the difference between reference signal VREF and feedback signal VFB, obtains error signal Verr.The inductive current flowing through inductor L increases gradually, that is the electric current flowing through resistor RCS increases gradually.Therefore, the current detection signal Ss that amplifier AMP exports also increases along with the increase of inductive current.When current detection signal Ss is greater than error signal Verr, comparator CMP exports comparison signal SET with reseting logic circuit LOG, and logical circuit LOG exports control signal Q and Q ', and to make respectively, upper switching tube M1 turns off, lower switching tube M2 conducting.Now, inductor L, capacitor C and lower switching tube M2 form current circuit, and inductive current declines.When the rising edge of clock signal clk arrives again, upper switching tube M1 conducting again, lower switching tube M2 turn off again, and circuit starts the new cycle, repeats the above-mentioned course of work.
When Fig. 4 A ~ 4C illustrates initial, light modulation switching signal VDIM ' is less than thermoinduction switching signal VNTC ', namely when reference signal VREF=VDIM ', and the work wave schematic diagram of reference signal generation circuit 320.Particularly, when Fig. 4 A illustrates that dim signal VDIM reduces, the work wave schematic diagram of reference signal generation circuit 320.As shown in Figure 4 A, if dim signal VDIM reduces, then reference signal VREF still equals light modulation switching signal VDIM ', and reference signal VREF reduces along with the reduction of dim signal VDIM.Thus, error signal Verr also reduces.Therefore, the ON time t of upper switching tube M1
onreduce, turn-off time t
offincrease, thus drive current ILED is reduced, reach the object reducing light-emitting component brightness.
Fig. 4 B illustrates that dim signal VDIM increases but light modulation switching signal VDIM ' when being still less than thermoinduction switching signal VNTC ', the work wave schematic diagram of reference signal generation circuit 320.As shown in Figure 4 B, now, reference signal VREF still equals light modulation switching signal VDIM ', and reference signal VREF increases along with the increase of dim signal VDIM.Thus, error signal Verr also increases.Therefore, the ON time t of upper switching tube M1
onincrease, turn-off time t
offreduce, thus drive current ILED is increased, reach the object improving light-emitting component brightness.
When Fig. 4 C illustrates that dim signal VDIM increases and makes light modulation switching signal VDIM ' be greater than thermoinduction switching signal VNTC ', the work wave schematic diagram of reference signal generation circuit 320.As shown in Figure 4 C, now, reference signal VREF will equal thermoinduction switching signal VNTC '.Thus, error signal Verr increases but is determined by thermoinduction signal VNTC.Therefore, the ON time t of upper switching tube M1
onincrease, turn-off time t
offreduce, and its concrete ON time t
onwith turn-off time t
offdetermined by thermoinduction signal VNTC.Thus on the one hand, drive current ILED increases, improve the brightness of light-emitting component, on the other hand, the size of drive current ILED is determined by thermoinduction signal VNTC, can not the unconfined increase along with the increase of dim signal VDIM, play the effect avoiding light-emitting component overheated.
Be greater than thermoinduction switching signal VNTC ' for light modulation switching signal VDIM ' time initial, i.e. the situation of VREF=VNTC ', its operation principle is similar, is not repeated herein.
Although exemplary embodiment describe the utility model with reference to several, should be appreciated that term used illustrates and exemplary and nonrestrictive term.Specifically can implement in a variety of forms due to the utility model and not depart from spirit or the essence of utility model, so be to be understood that, above-described embodiment is not limited to any aforesaid details, and explain widely in the spirit and scope that should limit in claim of enclosing, therefore fall into whole change in claim or its equivalent scope and remodeling and all should be claim of enclosing and contained.
Claims (8)
1. for a controller for light emitting element driver, light emitting element driver comprises power converter, and power converter provides drive current to light-emitting component, it is characterized in that, controller comprises:
Reference signal generation circuit, comprising:
Dim signal converting unit, has input and output, and wherein input receives dim signal, and produces light modulation switching signal according to dim signal at output;
Thermoinduction signal conversion unit, has input and output, and wherein input receives thermoinduction signal, and produces thermoinduction switching signal according to thermoinduction signal at output; And
Selected cell, there is first input end, the second input and output, wherein first input end is coupled to dim signal converting unit to receive light modulation switching signal, second input is coupled to thermoinduction signal conversion unit to receive thermoinduction switching signal, and produces reference signal according to the smaller value in light modulation switching signal and thermoinduction switching signal at output; And
Control circuit, there is first input end, the second input and output, wherein first input end is coupled to reference signal generation circuit to receive reference signal, second input receives the feedback signal representing drive current, and produces control signal to control power converter according to reference signal and feedback signal at output.
2. controller as claimed in claim 1, it is characterized in that, light modulation switching signal and thermoinduction switching signal have maximum respectively, and the maximum of light modulation switching signal and thermoinduction switching signal is equal.
3. controller as claimed in claim 1, is characterized in that,
Dim signal converting unit comprises:
Amplifier AMP1, has first input end, the second input, the 3rd input and output, and described first input end receives dim signal, and described second input receives dim signal first threshold values, and described 3rd input is coupled to described output;
Resistor R1, have first end and the second end, described first end is coupled to the output of amplifier AMP1; And
Buffer BUF1, has first input end, the second input and output, and described first input end receives dim signal second threshold values, and described second input is coupled to second end of described output and resistor R1;
Thermoinduction signal conversion unit comprises:
Amplifier AMP2, has first input end, the second input, the 3rd input and output, and described first input end receives thermoinduction signal, and described second input receives thermoinduction signal first threshold values, and described 3rd input is coupled to described output;
Resistor R2, have first end and the second end, described first end is coupled to the output of amplifier AMP2; And
Buffer BUF2, has first input end, the second input and output, and described first input end receives thermoinduction signal second threshold values, and described second input is coupled to second end of described output and resistor R2; And
Selected cell comprises selection resistor, selected cell receives and flows through first electric current of resistor R1 and flow through second electric current of resistor R2, select the smaller value in the first electric current and the second electric current, and make described smaller value electric current flow through selection resistor to produce reference voltage.
4. controller as claimed in claim 1, is characterized in that,
Dim signal converting unit comprises:
Amplifier AMP1, has first input end, the second input, the 3rd input and output, and described first input end receives dim signal, and described second input receives dim signal first threshold values, and described 3rd input is coupled to described output;
Resistor R1, have first end and the second end, described first end is coupled to the output of amplifier AMP1;
Buffer BUF1, has first input end, the second input and output, and described first input end receives dim signal second threshold values, and described second input is coupled to second end of described output and resistor R1; And
Resistor R3, has first end and the second end, and described first end is coupled to the first end of resistor R1 to receive the first electric current, and described first end provides light modulation switching signal, and described second end is coupled to reference to ground; And
Thermoinduction signal conversion unit comprises:
Amplifier AMP2, has first input end, the second input, the 3rd input and output, and described first input end receives thermoinduction signal, and described second input receives thermoinduction signal first threshold values, and described 3rd input is coupled to described output;
Resistor R2, have first end and the second end, described first end is coupled to the output of amplifier AMP2;
Buffer BUF2, has first input end, the second input and output, and described first input end receives thermoinduction signal second threshold values, and described second input is coupled to second end of described output and resistor R2; And
Resistor R4, has first end and the second end, and described first end is coupled to the first end of resistor R2 to receive the second electric current, and described first end provides thermoinduction switching signal, and described second end is coupled to reference to ground;
Wherein, selected cell is coupled to the first end of resistor R3 and resistor R4 respectively to receive light modulation switching signal and thermoinduction switching signal, and selects smaller value in light modulation switching signal and thermoinduction switching signal as with reference to signal.
5. for driving a driver for light-emitting component, it is characterized in that, driver comprises:
Controller as described in Claims 1 to 4 any one; And
Power converter, receives input voltage and provides drive current to light-emitting component.
6. for a controller for light emitting element driver, light emitting element driver comprises power converter, and power converter provides drive current to light-emitting component, it is characterized in that, controller comprises:
Reference signal generation circuit, comprising:
Dim signal converting unit, has input and output, and wherein input receives dim signal, and produces light modulation switching signal according to dim signal at output; And
Selected cell, there is first input end, the second input and output, wherein first input end is coupled to dim signal converting unit to receive light modulation switching signal, second input receives thermoinduction signal, and produces reference signal according to the smaller value in light modulation switching signal and thermoinduction signal at output; And
Control circuit, there is first input end, the second input and output, wherein first input end is coupled to reference signal generation circuit to receive reference signal, second input receives the feedback signal representing drive current, and produces control signal to control power converter according to reference signal and feedback signal at output.
7. for a controller for light emitting element driver, light emitting element driver comprises power converter, and power converter provides drive current to light-emitting component, it is characterized in that, controller comprises:
Reference signal generation circuit, comprising:
Thermoinduction signal conversion unit, has input and output, and wherein input receives thermoinduction signal, and produces thermoinduction switching signal according to thermoinduction signal at output; And
Selected cell, there is first input end, the second input and output, wherein first input end is coupled to thermoinduction signal conversion unit to receive thermoinduction switching signal, second input receives dim signal, and produces reference signal according to the smaller value in dim signal and thermoinduction switching signal at output; And
Control circuit, there is first input end, the second input and output, wherein first input end is coupled to reference signal generation circuit to receive reference signal, second input receives the feedback signal representing drive current, and produces control signal to control power converter according to reference signal and feedback signal at output.
8. for a controller for light emitting element driver, light emitting element driver comprises power converter, and power converter provides drive current to light-emitting component, it is characterized in that, controller comprises:
Selected cell, has first input end, the second input and output, and wherein first input end receives dim signal, and the second input receives thermoinduction signal, and produces reference signal according to the smaller value in dim signal and thermoinduction signal at output; And
Control circuit, there is first input end, the second input and output, wherein first input end is coupled to reference signal generation circuit to receive reference signal, second input receives the feedback signal representing drive current, and produces control signal to control power converter according to reference signal and feedback signal at output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420339393.4U CN204377179U (en) | 2014-06-24 | 2014-06-24 | Light emitting element driver and controller thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420339393.4U CN204377179U (en) | 2014-06-24 | 2014-06-24 | Light emitting element driver and controller thereof |
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| Publication Number | Publication Date |
|---|---|
| CN204377179U true CN204377179U (en) | 2015-06-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420339393.4U Expired - Fee Related CN204377179U (en) | 2014-06-24 | 2014-06-24 | Light emitting element driver and controller thereof |
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| Country | Link |
|---|---|
| CN (1) | CN204377179U (en) |
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2014
- 2014-06-24 CN CN201420339393.4U patent/CN204377179U/en not_active Expired - Fee Related
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