CN101711070A - LED direct-current input control circuit - Google Patents
LED direct-current input control circuit Download PDFInfo
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- CN101711070A CN101711070A CN 200910109658 CN200910109658A CN101711070A CN 101711070 A CN101711070 A CN 101711070A CN 200910109658 CN200910109658 CN 200910109658 CN 200910109658 A CN200910109658 A CN 200910109658A CN 101711070 A CN101711070 A CN 101711070A
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Abstract
The invention relates to an LED direct-current input control circuit which comprises an input detecting circuit, a voltage increasing circuit and a voltage decreasing circuit which are connected in sequence and also comprises a feedback circuit. The voltage increasing circuit and the voltage decreasing circuit are used for increasing and decreasing the voltage of an inputted direct-current signal and outputting the voltage to supply power to an LED lamp, and the feedback circuit is connected with the voltage decreasing circuit and is used for controlling the constant voltage and the constant current of an output signal. After detecting that the inputted direct-current signal has overvoltage, the input detecting circuit outputs a first overvoltage shutting-off signal to the voltage increasing circuit so as to directly output the inputted direct-current signal to the voltage decreasing circuit to decrease the voltage and supply power to the LED lamp, and after detecting that the inputted direct-current signal has undervoltage, the input detecting circuit outputs an undervoltage shutting-off signal to the voltage increasing circuit and the voltage decreasing circuit so as to shut off the voltage increasing circuit and the voltage decreasing circuit and carry out undervoltage protection to the voltage increasing circuit and the voltage decreasing circuit. The LED direct-current input control circuit can realize the direct-current input of low voltage and wide range and has the input undervoltage and overvoltage function, the constant current outputting function and the output overvoltage protection function.
Description
Technical field
The present invention relates to the LED control circuit, more particularly, relate to a kind of LED direct-current input control circuit.
Background technology
At present, the electric power system that locomotive light adopted in colliery owing to need to give a plurality of electric, causes its change in voltage very big.On the other hand; the employed locomotive light in colliery industry transportation colliery mainly has following shortcoming now: shortcomings such as input voltage range is narrow, light source life is short, light efficiency is low, vibration resistance is poor, maintenance cycle is short, defencive function deficiency are not suitable for using for a long time in the down-hole.And existing locomotive light in use often because of extinguishing unusually appears in line fault, may cause serious security incident like this.
Therefore, locomotive light needs further to improve its serviceability.
Summary of the invention
The technical problem to be solved in the present invention is: at the narrow and defencive function defect of insufficient of above-mentioned input voltage range of existing locomotive light, provide a kind of direct current input LED control circuit.
The technical solution adopted for the present invention to solve the technical problems is: by adopting input detecting circuit, booster circuit, reduction voltage circuit, feedback circuit; construct a kind of direct current input and carry out voltage stabilizing, and can carry out the direct current input LED control circuit of over-and under-voltage protection wide voltage.
A kind of direct current input of the present invention LED control circuit comprises:
Input detecting circuit is used for the direct current signal of input is detected;
With the booster circuit that described input detecting circuit links to each other, be used for direct current signal is boosted;
With the reduction voltage circuit that described booster circuit links to each other, be used for direct current signal is carried out step-down, and be output as the power supply of LED lamp;
With the feedback circuit that described reduction voltage circuit links to each other, be used to detect the voltage and current of described reduction voltage circuit output, send corresponding feedback control signal and give described reduction voltage circuit, thereby realize control the output signal constant pressure and flow;
Wherein, described input detecting circuit is exported the first overvoltage cut-off signals and is given described booster circuit when the direct current signal overvoltage that detects input, is used for that the direct current signal of input is directly exported to described reduction voltage circuit and carries out being the power supply of LED lamp after the step-down; Described input detecting circuit is when the direct current signal that detects input is under-voltage, and output undervoltage turnoff signal is given described booster circuit and reduction voltage circuit, is used to turn-off described booster circuit and reduction voltage circuit, and circuit is carried out under-voltage protection.
Implement direct current input LED control circuit of the present invention, have following beneficial effect: the present invention can realize the direct current input of low-voltage wide region, and protects importing under-voltage overvoltage, and effectively protective circuit is not damaged; Constant current is carried out in output, can be made output current constant, light source luminescent is constant; Circuit is carried out overheat protector, and wiring board is damaged when preventing high temperature; Overvoltage protection is carried out in output,, protect external load effectively when circuit output has when unusual.Circuit of the present invention can solve the colliery locomotive light effectively, shortcomings such as input voltage range is narrow, light source life is short, light efficiency is low, defencive function deficiency.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the structural representation of the direct current input LED control circuit of a preferred embodiment of the present invention;
Fig. 2 is first's circuit theory diagrams of the direct current input LED control circuit of a preferred embodiment of the present invention;
Fig. 3 is the second portion circuit theory diagrams of the direct current input LED control circuit of a preferred embodiment of the present invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Fig. 1 is the structural representation of the direct current input LED control circuit of a preferred embodiment of the present invention.As shown in Figure 1, in the control circuit of the embodiment of the invention, mainly comprise input detecting circuit 100, booster circuit 200, reduction voltage circuit 300 and feedback circuit 400.
Described input detecting circuit 100 is exported the first overvoltage cut-off signals and is given described booster circuit 200 when the direct current signal overvoltage that detects input, and the direct current signal of input is directly exported to described reduction voltage circuit 300 carry out being the power supply of LED lamp after the step-down.
Described input detecting circuit 100 is when the direct current signal that detects input is under-voltage; output undervoltage turnoff signal is given described booster circuit 200; and export the undervoltage turnoff signal simultaneously and give described reduction voltage circuit 300, thereby turn-off described booster circuit 200 and reduction voltage circuit 300, circuit is protected.
As indicated above, by the control action of input detecting circuit 100, realized input overvoltage and under-voltage protection, and carried out FEEDBACK CONTROL that exporting stable direct current signal is 600 power supplies of LED lamp by 400 pairs of direct current signals of feedback circuit.
Realizing basic constant pressure and flow, and after the overvoltage and under-voltage protection function of input, the present invention also realizes the overvoltage protection exported by increasing output detection circuit 500.Described output detection circuit 500 links to each other with described reduction voltage circuit 300, gather the voltage of described reduction voltage circuit 300 outputs, the magnitude of voltage of the direct current signal of control circuit output, when the direct current signal overvoltage that detects output, export the second overvoltage cut-off signals and give described reduction voltage circuit 300, to turn-off described reduction voltage circuit 300.
What deserves to be mentioned is that except above-mentioned functions, circuit of the present invention can also be realized other supplementary protection function.Input detecting circuit 100 also comprises fuse F1 as described, is used for turn-offing when the input overcurrent direct current signal of input.Described reduction voltage circuit 300 adopts the chip U1 that boosts with overheat protector function, carries out internal protection when described direct current input LED control circuit temperature surpasses certain limit, turn-offs the direct current signal of output.
Fig. 2 is first's circuit theory diagrams of the direct current input LED control circuit of a preferred embodiment of the present invention.As shown in Figure 2, the main circuit element of described input detecting circuit 100 employings is the first dual operational amplifier chip U7 and voltage reference source chip U8.In the present embodiment, the model of the first dual operational amplifier chip U7 is LM2904, and the model of voltage reference source chip U8 is AZ431 or TL431.Described input detecting circuit 100 links to each other with the power supply of wide voltage input, and adopts fuse F1 detection electric current whether to exceed preset range, realizes overcurrent protection.Described input detecting circuit 100 comprises the first dual operational amplifier chip U7, the first triode Q1, the first voltage stabilizing didoe ZD1, the second voltage stabilizing didoe ZD2, the first voltage reference source chip U8 at least; Wherein, the collector electrode of the first triode Q1 links to each other by the electrode input end of first inductance L 1 with described direct current input LED control circuit, be connected with first resistance R 1 between the collector electrode of the first triode Q1 and the base stage, the base stage of the first triode Q1 links to each other with the negative electrode of the first voltage stabilizing didoe ZD1, the plus earth of the first voltage stabilizing didoe ZD1, the base stage of the first triode Q1 links to each other with the negative electrode of the second voltage stabilizing didoe ZD2, the control end that is connected with second resistance R, 2, the first voltage reference source chip U8 between the anode of the emitter of the first triode Q1 and the second voltage stabilizing didoe ZD2 links to each other with the anode of the described second voltage stabilizing didoe ZD2 by the 3rd resistance R 3; The anode of the second voltage stabilizing didoe ZD2 is by first capacitor C, 2 ground connection; Be connected with second capacitor C 4 between the control end of the first voltage reference source chip U8 and the earth terminal, its earth terminal ground connection, control end links to each other with the sampling end, and by the 4th resistance R 4 ground connection; The 4th pin ground connection of the first dual operational amplifier chip U7, first inverting input, 2 pin of the first dual operational amplifier chip U7 connect the control end of the first voltage reference source chip U8 by the 5th resistance R 5, first output, 1 pin of the first dual operational amplifier chip U7 connects the collector electrode of the first triode Q1 by the 6th resistance R 10, the 7th resistance R 9, the 8th resistance R 6 of series connection successively, and the node between the 7th resistance R 9 and the 8th resistance R 6 is by the 3rd capacitor C 3, the 9th resistance R 8, the tenth resistance R 7 ground connection parallel with one another; First in-phase input end, 3 pin of the first dual operational amplifier chip U7 are linked the node between the 6th resistance R 10 and the 7th resistance R 9; Second in-phase input end, 5 pin of the first dual operational amplifier chip U7 link to each other with the sampling end of the first voltage reference source chip U8 by the 11 resistance R 12, second inverting input, 6 pin of the first dual operational amplifier chip U7 are successively by the 12 resistance R the 63, the 13 resistance R 62 ground connection, the 3rd capacitor C 12 is in parallel with the 13 resistance R 62, the collector electrode that ten four resistance R 60 and ten five resistance R 61 of the node between the 12 resistance R 63 and the 13 resistance R 62 by parallel connection meets the first triode Q1; Second output, 7 pin of the first dual operational amplifier chip U7 link to each other with second in-phase input end, 5 pin of the first dual operational amplifier chip U7 with the 17 resistance R 13 by the 16 resistance R 69 of series connection successively, node between the 16 resistance R 69 and the 17 resistance R 13 is by the 3rd voltage stabilizing didoe ZD6 parallel with one another and the 4th capacitor C 15 ground connection, and the node between the 16 resistance R 69 and the 17 resistance R 13 connects the negative electrode of the 3rd voltage stabilizing didoe ZD6; Second in-phase input end, 5 pin of the first dual operational amplifier chip U7 link to each other with the anode of the second voltage stabilizing didoe ZD2, first output, 1 pin of the first dual operational amplifier chip U7 links to each other with the anode of the first diode D1, second output, 7 pin of the first dual operational amplifier chip U7 link to each other with the anode of the second diode D2, the anode of the second diode D2 connects the K2 node, the negative electrode of the second diode D2 links to each other with the negative electrode of the first diode D1, the collector electrode of the first triode Q1 connects the negative electrode of booster circuit 200, the first diode D1 as control signal output connection booster circuit 200 as the output of direct current signal.
As reference voltage, and form an overvoltage and under-voltage decision circuitry with benchmark source of stable pressure U8, the voltage of the direct current signal of input is judged by voltage-stabiliser tube ZD1 and ZD2, triode Q1 and a plurality of resistance capacitance R1, R2... etc.Wherein, the voltage signal of voltage reference source chip U8 is input to the reverse input end of first amplifier after treatment respectively, and the input in the same way of second amplifier is as first reference voltage and second reference voltage.And correspondingly, direct-flow input signal links to each other with the input in the same way of first amplifier and the reverse input end of second amplifier.First and second amplifiers are respectively for first reference voltage and direct-flow input signal, the size of second reference voltage and direct-flow input signal is judged, signal output pin the 1st pin of first amplifier by the first dual operational amplifier chip U7 when the direct current signal overvoltage that detects input is exported the corresponding first overvoltage cut-off signals, and signal output pin the 7th pin by second amplifier when the direct current signal that detects input is under-voltage is exported corresponding undervoltage turnoff signal.
Described booster circuit 200 adopts the chip U1 that boosts, and its model is LM3478.Booster circuit 200 comprises the chip U1 that boosts, second inductance L 2, the 3rd diode D5, the first electrochemical capacitor C9, the first field effect transistor Q6 at least; First end of second inductance L 2 links to each other with the collector electrode of the first triode Q1, and second end of second inductance L 2 connects the output of booster circuit 200, i.e. VOUT1 interface by the 4th diode D6 of forward; The 18 resistance R 66 of connecting successively between the two ends of the 4th diode D6 and the 5th capacitor C 13, the negative electrode of the 4th diode D6 is by the first electrochemical capacitor C9 ground connection of forward, first end of second inductance L 2 is connected with the anode of the 3rd diode D5, and the negative electrode of the 3rd diode D5 links to each other with the negative electrode of the 4th diode D6; The anode of the 4th diode D6 links to each other with the drain electrode of the first field effect transistor Q6, and the source electrode of the first field effect transistor Q6 is by the 19 resistance R 18 ground connection; The grid of the first field effect transistor Q6 connects an end of the 22 resistance R 17, and the other end of the 22 resistance R 17 is by the 6th capacitor C the 7, the 20 resistance R the 67, the 21 resistance R 68 ground connection in parallel; Boost the 5th pin PGD and the 4th pin AGD ground connection of chip U1, link to each other with the grid of the first field effect transistor Q6 turn-on and turn-off of output PWM ripple control field effect transistor Q6 of the 6th pin DR of chip U1 of boosting, boost the 7th pin FFA of chip U1 by the 23 resistance R 16 ground connection, and link to each other with the negative electrode of the above-mentioned first diode D1 by the 24 resistance R 21, boost the 8th pin IN of chip U1 by in parallel the 7th capacitor C 6 and the 8th capacitor C 5 ground connection, the 8th pin IN of chip U1 of boosting links to each other with the emitter of the second triode Q2, the collector electrode of the second triode Q2 is by the voltage stabilizing didoe ZD5 of forward successively and reverse diode D4 connection interface K1, the collector electrode of the second triode Q2 links to each other with the anode of the above-mentioned second voltage stabilizing didoe ZD2 by the 5th reverse diode D3, the collector electrode of the second triode Q2 is successively by the 25 resistance R 14 and the 4th voltage stabilizing didoe ZD4 ground connection, and the 25 resistance R 14 links to each other with the grid of the second triode Q2 with node between the 4th voltage stabilizing didoe ZD4 negative electrode; The 1st pin ISENV of chip U1 of boosting links to each other with the other end of the 22 resistance R 17, and the 2nd pin COM of the chip U1 that boosts is by the 9th capacitor C 8 and the 26 resistance R 15 ground connection of series connection; The negative electrode of the 4th diode D6 is by the 27 resistance R 19 and the 28 resistance R 20 ground connection of series connection successively, node between the 27 resistance R 19 and the 28 resistance R 20 links to each other with the 3rd pin FB of the chip U1 that boosts, thereby provides output feedback signal for the chip U1 that boosts; The negative electrode of the 4th diode D6 connects reduction voltage circuit 300 as output.When the 6th pin of the chip U1 that boosts is exported high level, field effect transistor Q6 conducting, the output of inductance L 2 is dragged down; When the 6th pin output low level of the chip U1 that boosts, field effect transistor Q6 turn-offs; The chip U1 that boosts can regulate the duty ratio of output PWM ripple according to the feedback signal size of the 3rd pin collection, thus control booster circuit 200 output end voltage sizes.
Simultaneously, first output pin, 1 pin of the described first dual operational amplifier chip U7 is connected to the 7th pin FFA of the chip U1 that boosts by diode D1, the first overvoltage cut-off signals is defeated by the chip U1 that boosts, the signal output pin of second amplifier of the described first dual operational amplifier chip U7 i.e. the 7th pin also links to each other with the 7th pin FFA of the described chip U1 that boosts by diode D2, be used to carry the undervoltage turnoff signal, make the chip U1 that boosts quit work in the circuit overvoltage with when under-voltage.When booster circuit 200 turn-offed, the direct current signal of input directly flow into reduction voltage circuit 300 from diode D5.
Fig. 3 is the second portion circuit theory diagrams of the direct current input LED control circuit of a preferred embodiment of the present invention.As shown in Figure 3, described reduction voltage circuit 300 adopts the step-down chip U2 that possesses overheat protector, and its model is OB2269.Reduction voltage circuit 300 comprises step-down chip U2, transformer T2 at least; The input of reduction voltage circuit 300 is the VOUT1 node, the 29 resistance R 22 by series connection, the 30 resistance R 23 and the 31 resistance R 24 are connected to the 3rd pin VIN of described step-down chip U2, the 3rd pin VIN is by the 9th capacitor C 14 ground connection, the input of described reduction voltage circuit 300 is connected to the negative electrode of the 6th diode D10 by the tenth capacitor C 16, the input of described reduction voltage circuit 300 is the 32 resistance R 32 and the 33 resistance R 34 negative electrode that is connected to the 6th diode D10 by series connection also, also be connected with the 34 resistance R 33 and the 35 resistance R 35 of connecting between the negative electrode of the input of described reduction voltage circuit 300 and the 6th diode D10, and the node between the 32 resistance R 32 and the 33 resistance R 34 is connected to the node between the 34 resistance R 33 and the 35 resistance R 35, the anode of the 6th diode D10 links to each other with the drain electrode of the second field effect transistor Q3, and the input of reduction voltage circuit 300 is connected to the drain electrode of the second field effect transistor Q3 by the former avris of first winding of transformer T2; The grid of the second field effect transistor Q3 is connected with the 36 resistance R 26 by the 8th pin G that the 7th diode D11 of forward is connected to step-down chip U2 between the anode of the 7th diode D11 and the negative electrode; The source electrode of the second field effect transistor Q3 is by the 37 resistance R 29 ground connection, be connected with the 38 resistance R 27 between the second field effect transistor Q3 grid and the source electrode, the second field effect transistor Q3 source electrode is connected to the 6th pin CS of step-down chip U2 by the 39 resistance R 28, and the 6th pin CS of step-down chip U2 is by the 11 capacitor C 17 ground connection; The former avris one end ground connection of first winding of transformer T2, the other end passes through the 8th diode D12 of forward successively, the 40 resistance R 30 is connected to the collector electrode of the 3rd triode Q4, the collector electrode connection interface K1 of the 3rd triode Q4, be connected with the 41 resistance R 31 between the collector electrode of the 3rd triode Q4 and the base stage, the base stage of the 3rd triode Q4 is connected to the negative electrode of the 4th voltage-stabiliser tube ZD3, the plus earth of the 4th voltage-stabiliser tube ZD3, the emitter of the 3rd triode Q4 is connected to the 7th pin VDD of step-down chip U2, the 7th pin VDD of step-down chip U2 is by the 12 capacitor C 34 and the 13 capacitor C 33 ground connection in parallel, the 5th pin RT of step-down chip U2 is the 42 resistance R 70 and the thermo-sensitive resistor TH1 ground connection by connecting successively, the 5th pin RT of step-down chip U2 is connected to the collector electrode of the 4th triode Q10, the grounded emitter of the 4th triode Q10, the base stage of the 4th triode Q10 is connected to the first dual operational amplifier chip U7, second output, 7 pin by the 43 resistance R 64, and promptly interface K2 receives corresponding undervoltage turnoff signal.Be connected with the 44 resistance R 65 between the base stage of the 4th triode Q10 and the emitter; The 1st pin GD ground connection of step-down chip U2, the 2nd pin are by the 14 capacitor C 15 ground connection, and the 4th pin is by the 45 resistance R 25 ground connection.
First end of the secondary side of described transformer T2 first winding is connected to the anode of the 5th voltage stabilizing didoe D13, the negative electrode of the 5th voltage stabilizing didoe D13 is connected to the anode of LED lamp 600 successively by the 3rd inductance L 4 and the 4th inductance L 5, the two ends of the 5th voltage stabilizing didoe D13 are connected with the 15 capacitor C 19 and the 46 resistance R 36 of series connection, the second end ground connection of the secondary side of described transformer T2 first winding, the negative electrode of the 5th voltage stabilizing didoe D13 is by the second electrochemical capacitor C20 ground connection, node between the 3rd inductance L 4 and the 4th inductance L 5 is by the 3rd electrochemical capacitor C21 ground connection, the negative electrode of LED lamp 600 is connected with the 16 capacitor C 22 by the 47 resistance R 37 ground connection between the anode of LED lamp 600 and the negative electrode.
Step-down chip U2 links to each other with the grid of the second field effect transistor Q3 by the 8th pin G output PWM ripple signal, thus the turn-on and turn-off time of control field effect transistor Q3.Step-down chip U2 is by the adjusting to the 8th pin G output PWM ripple duty ratio, the voltage swing of control transformer T2 output.The secondary side of transformer T2 is connected to the output of reduction voltage circuit 300, is 600 power supplies of LED lamp.In addition, the 5th pin RT of step-down chip U2 is by thermo-sensitive resistor TH1 ground connection.When the ambient temperature of control circuit was spent greater than 80, thermo-sensitive resistor TH1 resistance reduced, and makes the voltage of thermo-sensitive resistor TH1 reduce, thereby turn-offed step-down chip U2, made the entire circuit no-output.Therefore, control circuit of the present invention can effective protective circuit be damaged when high temperature.
By above-mentioned input detecting circuit 100, booster circuit 200 and reduction voltage circuit 300, because using, this circuit constituted 2 grades of conversion, promptly boost through booster circuit 200 earlier, again through reduction voltage circuit 300 step-downs.Just can realize detection and adjusting, make this circuit can be in input voltage 11V stable work in the wide region of 80V to the input of wide voltage.When input voltage is lower than 45V greater than 11V, 1 pin of the first dual operational amplifier chip U7, the equal output low level of 7 pin, the chip U1 operate as normal of boosting, booster circuit 200 circuit are elevated to 65V with input voltage.When input voltage is lower than 10V, 7 pin of first dual operational amplifier chip U7 output high level, the chip U1 that boosts quits work, and the chip of step-down simultaneously U2 quits work, and circuit 300 quits work, the entire circuit no-output.When input voltage during greater than 45V, 1 pin of first dual operational amplifier chip U7 output high level, the chip U1 that boosts quits work, and input voltage is directly inputted to reduction voltage circuit 300 through D5, reduces the voltage to 22V.
What deserves to be mentioned is that this circuit also utilizes second section circle of transformer T2, the 4th voltage-stabiliser tube ZD3 to provide stable operating voltage for step-down chip U2.Provide operating voltage by elements such as diode D4, voltage-stabiliser tube ZD5 for boost the chip U1 and the first dual operational amplifier chip U7 simultaneously.
The present invention also also carries out constant pressure and flow to output by feedback circuit 400.Described feedback circuit 400 adopts the second dual operational amplifier chip U5 that the voltage of the direct current signal of reduction voltage circuit 300 outputs is detected, and its model is TSM103.Feedback circuit 400 comprises the second dual operational amplifier chip U5 at least, the 8th pin of the second dual operational amplifier chip U5 links to each other with the anode of LED lamp 600, the anode of LED lamp 600 is the 48 resistance R 39 by connecting successively, the 49 resistance R 46 and the 50 resistance R 47 ground connection, node between the 48 resistance R 39 and the 49 resistance R 46 is connected to first inverting input, 2 pin of the second dual operational amplifier chip U5, first inverting input, 2 pin of the second dual operational amplifier chip U5 are by the 17 capacitor C 31 ground connection, first in-phase input end, 3 pin of the second dual operational amplifier chip U5 are by the 18 capacitor C 29 ground connection, the ground end of the second dual operational amplifier chip U5 or negative voltage side 4 pin ground connection.
The anode of LED lamp 600 also passes through the 51 resistance R 41 of series connection successively, the 52 resistance R 44 and the 53 resistance R 45 ground connection, node between the 52 resistance R 44 and the 53 resistance R 45 is connected to second in-phase input end, 5 pin of the second dual operational amplifier chip U5, second in-phase input end, 5 pin of the second dual operational amplifier chip U5 are by the 19 capacitor C 30 ground connection, power end 8 pin of the second dual operational amplifier chip U5 are by the 20 capacitor C 27 ground connection, second inverting input, 6 pin of the second dual operational amplifier chip U5 link to each other with the negative electrode of LED lamp 600 by the 54 resistance R 38, second inverting input, 6 pin are by the 21 capacitor C 28 ground connection, be connected with the 23 capacitor C 26 and the 55 resistance R 43 that also are connected with series connection between second inverting input, 6 pin of the 22 capacitor C 25, the second dual operational amplifier chip U5 and second output, 7 pin between second inverting input, 6 pin of the second dual operational amplifier chip U5 and second output, 7 pin.
First output, 1 pin of the second dual operational amplifier chip U5 is connected to the negative electrode of the 9th diode D15, the anode of the 9th diode D15 is connected to the negative electrode of the first opto-coupler chip U3 input side, power end 8 pin of the second dual operational amplifier chip U5 are connected to the negative electrode of the tenth diode D14, the anode of the tenth diode D14 is connected to the negative electrode of the first opto-coupler chip U3 input side, the anode of the first opto-coupler chip U3 input side is connected to the anode of LED lamp 600 by the 56 resistance R 40, the anode of the first opto-coupler chip U3 outlet side is connected to the 2nd pin FB of step-down chip U2, the minus earth of the first opto-coupler chip U3 outlet side.
When circuit working, if the overtension of reduction voltage circuit 300 outputs, the 1st pin output low level of the second dual operational amplifier chip U5, the first opto-coupler chip U3 conducting, its output head anode output low level; If reduction voltage circuit 300 output flow through height, the 7th pin output low level of the second dual operational amplifier chip U5, the first opto-coupler chip U3 conducting, its output head anode output low level.That is, if when the voltage of LED or electric current have at least one too high, the first opto-coupler chip U3 is to the control section output low level.Overall, the second dual operational amplifier chip U5 controls the output of the first opto-coupler chip U3 according to the voltage and current size of reduction voltage circuit 300 outputs of gathering, thereby regulates the voltage and current of the direct current signal of step-down chip U2 output.
The present invention also realizes the overvoltage protection exported by increasing output detection circuit 500.Described output detection circuit 500 comprises the second opto-coupler chip U4 and the second voltage reference source chip U6 at least, the anode of LED lamp 600 is connected to the anode of the input side of the second opto-coupler chip U4 by the 57 resistance R 48, the negative electrode of the input side of the second opto-coupler chip U4 is connected to the control end of the second voltage reference source chip U6, the negative electrode of the input side of the second opto-coupler chip U4 is connected to the anode of LED lamp 600 by the 58 resistance R 49, the anode of LED lamp 600 is connected to the sampling end of the second opto-coupler chip U4 by the 59 resistance R 50, and the sampling end of the second opto-coupler chip U4 is by the 60 resistance R 51 in parallel, the 61 resistance R 52 and the 24 capacitor C 32 ground connection.
When the overtension of reduction voltage circuit 300 output, the voltage increases of divider resistance the 60 resistance R 51 and the 61 resistance R 52, the sampling terminal voltage of the second voltage reference source chip U6 increases, the voltage of its control end reduces, the second opto-coupler chip U4 conducting, its output head anode output low level, it is low that the cut-off signals of described step-down chip U2 receives pin the 5th pin RT, described step-down chip U2 turn-offs, and stops the power supply for LED600.
Control circuit of the present invention can be in input direct current 11V stable work in the 80V scope, and control circuit has the constant current output function, can make light-source brightness constant.This control circuit also has the input under-voltage protection, output over-voltage protection circuit, functions such as overheat protector simultaneously.Problems such as the present invention solves existing narrow with the locomotive light input voltage range, and light source life is short, and light efficiency is low.The wide direct current of a kind of input voltage range input LED is provided control circuit, saves regulating resistor or directly become device, uses safer, the maintenance work of having avoided the power supply damage to cause.The use led light source life-span can be up to the characteristic that has anti-frequent switch more than 50,000 hours.This circuit also has the constant current output function simultaneously, can make light-source brightness constant, has reduced kopiopia, improves the fail safe in the use.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a direct current input LED control circuit is characterized in that, comprising:
Input detecting circuit (100) is used for the direct current signal of input is detected;
The booster circuit (200) that links to each other with described input detecting circuit (100) is used for direct current signal is boosted;
The reduction voltage circuit (300) that links to each other with described booster circuit (200) is used for direct current signal is carried out step-down, and is output as LED lamp (600) power supply;
The feedback circuit (400) that links to each other with described reduction voltage circuit (300), be used to detect the voltage and current of described reduction voltage circuit (300) output, send corresponding feedback control signal and give described reduction voltage circuit (300), thereby realize control the output signal constant pressure and flow;
Wherein, described input detecting circuit (100) is when the direct current signal overvoltage that detects input, export the first overvoltage cut-off signals and give described booster circuit (200), be used for that the direct current signal of input is directly exported to described reduction voltage circuit (300) and carry out being LED lamp (600) power supply after the step-down; Described input detecting circuit (100) is when the direct current signal that detects input is under-voltage; output undervoltage turnoff signal is given described booster circuit (200) and reduction voltage circuit (300); be used to turn-off described booster circuit (200) and reduction voltage circuit (300), circuit is carried out under-voltage protection.
2. direct current input LED control circuit according to claim 1, it is characterized in that, also comprise output detection circuit (500), link to each other with described reduction voltage circuit (300), be used to detect the voltage of described reduction voltage circuit (300) output, when detecting overvoltage, export the second overvoltage cut-off signals and give described reduction voltage circuit (300), to turn-off described reduction voltage circuit (300).
3. direct current input LED control circuit according to claim 1 is characterized in that described input detecting circuit (100) also is provided with fuse (F1), is used for turn-offing when the input overcurrent direct current signal of input.
4. direct current input LED control circuit according to claim 1, it is characterized in that described input detecting circuit (100) comprises the first dual operational amplifier chip (U7), first triode (Q1), first voltage stabilizing didoe (ZD1), second voltage stabilizing didoe (ZD2) and the first voltage reference source chip (U8) at least; Wherein, the collector electrode of first triode (Q1) links to each other by the electrode input end of first inductance (L1) with described direct current input LED control circuit, be connected with first resistance (R1) between the collector electrode of first triode (Q1) and the base stage, the base stage of first triode (Q1) links to each other with the negative electrode of first voltage stabilizing didoe (ZD1), the plus earth of first voltage stabilizing didoe (ZD1), the base stage of first triode (Q1) links to each other with the negative electrode of second voltage stabilizing didoe (ZD2), be connected with second resistance (R2) between the anode of the emitter of first triode (Q1) and second voltage stabilizing didoe (ZD2), the control end of the first voltage reference source chip (U8) links to each other with the anode of described second voltage stabilizing didoe (ZD2) by the 3rd resistance (R3); The anode of second voltage stabilizing didoe (ZD2) is by first electric capacity (C2) ground connection; Be connected with second electric capacity (C4) between the control end of the first voltage reference source chip (U8) and the earth terminal, its earth terminal ground connection, control end links to each other with the sampling end, and by the 4th resistance (R4) ground connection; The 4th pin ground connection of the first dual operational amplifier chip (U7), first inverting input, 2 pin of the first dual operational amplifier chip (U7) connect the control end of the first voltage reference source chip (U8) by the 5th resistance (R5), six resistance (R10) of first output, 1 pin of the first dual operational amplifier chip (U7) by connecting successively, the 7th resistance (R9), the 8th resistance (R6) connects the collector electrode of first triode (Q1), node between the 7th resistance (R9) and the 8th resistance (R6) is by the 3rd electric capacity (C3) parallel with one another, the 9th resistance (R8), the tenth resistance (R7) ground connection; First in-phase input end, 3 pin of the first dual operational amplifier chip (U7) are linked the node between the 6th resistance (R10) and the 7th resistance (R9); Second in-phase input end, 5 pin of the first dual operational amplifier chip (U7) link to each other with the sampling end of the first voltage reference source chip (U8) by the 11 resistance (R12), second inverting input, 6 pin of the first dual operational amplifier chip (U7) are successively by the 12 resistance (R63), the 13 resistance (R62) ground connection, the 3rd electric capacity (C12) is in parallel with the 13 resistance (R62), the collector electrode that the node between the 12 resistance (R63) and the 13 resistance (R62) meets first triode (Q1) by the 14 resistance (R60) in parallel and the 15 resistance (R61); Second output, 7 pin of the first dual operational amplifier chip (U7) link to each other with second in-phase input end, 5 pin of the first dual operational amplifier chip (U7) with the 17 resistance (R13) by the 16 resistance (R69) of series connection successively, node between the 16 resistance (R69) and the 17 resistance (R13) is by the 3rd voltage stabilizing didoe (ZD6) and the 4th electric capacity (C35) ground connection parallel with one another, and the node between the 16 resistance (R69) and the 17 resistance (R13) connects the negative electrode of the 3rd voltage stabilizing didoe (ZD6); Second in-phase input end, 5 pin of the first dual operational amplifier chip (U7) link to each other with the anode of second voltage stabilizing didoe (ZD2), first output, 1 pin of the first dual operational amplifier chip (U7) links to each other with the anode of first diode (D1), second output, 7 pin of the first dual operational amplifier chip (U7) link to each other with the anode of second diode (D2), the negative electrode of second diode (D2) links to each other with the negative electrode of first diode (D1), the collector electrode of first triode (Q1) connects booster circuit (200) as the output of direct current signal, and output connects booster circuit (200) to the negative electrode of first diode (D1) as control signal.
5. direct current input LED control circuit according to claim 4, it is characterized in that described booster circuit (200) comprises the chip that boosts (U1), second inductance (L2), the 3rd diode (D5), first electrochemical capacitor (C9) and first field effect transistor (Q6) at least; First end of second inductance (L2) links to each other with the collector electrode of first triode (Q1), and second end of second inductance (L2) connects the output of booster circuit (200) by the 4th diode (D6) of forward; Be connected with the 18 resistance (R66) and the 5th electric capacity (C13) of series connection successively between the two ends of the 4th diode (D6), the negative electrode of the 4th diode (D6) is by first electrochemical capacitor (C9) ground connection of forward, first end of second inductance (L2) is connected with the anode of the 3rd diode (D5), and the negative electrode of the 3rd diode (D5) links to each other with the negative electrode of the 4th diode (D6); The anode of the 4th diode (D6) links to each other with the drain electrode of first field effect transistor (Q6), and the source electrode of first field effect transistor (Q6) is by the 19 resistance (R18) ground connection in parallel; The grid of first field effect transistor (Q6) connects an end of the 22 resistance (R17), and the other end of the 22 resistance (R17) is by the 6th electric capacity (C7), the 20 resistance (R67), the 21 resistance (R68) ground connection in parallel; Boost the 4th pin (PGD) and the 5th pin (AGD) ground connection of chip (U1), the 6th pin (DR) of chip (U1) of boosting links to each other with the grid of first field effect transistor (Q6), boost the 7th pin (FFA) of chip (U1) by the 23 resistance (R16) ground connection, and link to each other with the negative electrode of first diode (D1) by the 24 resistance (R21), boost the 8th pin (IN) of chip (U1) by in parallel the 7th electric capacity (C6) and the 8th electric capacity (C5) ground connection, the 8th pin (IN) of chip (U1) of boosting links to each other with the emitter of second triode (Q2), the collector electrode of second triode (Q2) links to each other with the anode of second voltage stabilizing didoe (ZD2) by reverse the 5th diode (D3), the collector electrode of second triode (Q2) is successively by the 25 resistance (R14) and the 4th voltage stabilizing didoe (ZD4) ground connection, and the 25 resistance (R14) links to each other with the base stage of second triode (Q2) with node between the 4th voltage stabilizing didoe (ZD4) negative electrode; The 1st pin (ISENV) of chip (U1) of boosting links to each other with the other end of the 22 resistance (R17), and the 2nd pin (COM) of the chip that boosts (U1) is by the 9th electric capacity (C8) and the 26 resistance (R15) ground connection of series connection; The negative electrode of the 4th diode (D6) is by the 27 resistance (R19) and the 28 resistance (R20) ground connection of series connection successively, and the node between the 27 resistance (R19) and the 28 resistance (R20) links to each other with the 3rd pin (FB) of the chip that boosts (U1); The negative electrode of the 4th diode (D6) connects reduction voltage circuit (300) as output.
6. direct current input LED control circuit according to claim 5 is characterized in that described reduction voltage circuit (300) comprises step-down chip (U2) and transformer (T2) at least; The input of reduction voltage circuit (300) is by the 29 resistance (R22) of series connection, the 30 resistance (R23) and the 31 resistance (R24) are connected to the 3rd pin (VIN) of described step-down chip (U2), the 3rd pin (VIN) is by the 9th electric capacity (C14) ground connection, the input of described reduction voltage circuit (300) is connected to the negative electrode of the 6th diode (D10) by the tenth electric capacity (C16), the input of described reduction voltage circuit (300) also is connected to the negative electrode of the 6th diode (D10) by the 32 resistance (R32) and the 33 resistance (R34) of series connection, also be connected with the 34 resistance (R33) and the 35 resistance (R35) of connecting between the input of described reduction voltage circuit (300) and the negative electrode of the 6th diode (D10), and the node between the 32 resistance (R32) and the 33 resistance (R34) is connected to the node between the 34 resistance (R33) and the 35 resistance (R35), the anode of the 6th diode (D10) links to each other with the drain electrode of second field effect transistor (Q3), and the input of reduction voltage circuit (300) is connected to the drain electrode of second field effect transistor (Q3) by the former avris of first winding of transformer (T2); The grid of second field effect transistor (Q3) is connected to the 8th pin (G) of step-down chip (U2) by the 7th diode (D11) of forward, is connected with the 36 resistance (R26) between the anode of the 7th diode (D11) and the negative electrode; The source electrode of second field effect transistor (Q3) is by the 37 resistance (R29) ground connection, be connected with the 38 resistance (R27) between second field effect transistor (Q3) grid and the source electrode, second field effect transistor (Q3) source electrode is connected to the 6th pin (CS) of step-down chip (U2) by the 39 resistance (R28), and the 6th pin (CS) of step-down chip (U2) is by the 11 electric capacity (C17) ground connection; The former avris one end ground connection of first winding of transformer (T2), the other end passes through the 8th diode (D12) of forward successively, the 40 resistance (R30) is connected to the collector electrode of the 3rd triode (Q4), be connected with the 41 resistance (R31) between the collector electrode of the 3rd triode (Q4) and the base stage, the base stage of the 3rd triode (Q4) is connected to the negative electrode of the 4th voltage-stabiliser tube (ZD3), the plus earth of the 4th voltage-stabiliser tube (ZD3), the emitter of the 3rd triode (Q4) is connected to the 7th pin (VDD) of step-down chip (U2), the 7th pin (VDD) of step-down chip (U2) is by the 12 electric capacity (C34) and the 13 electric capacity (C33) ground connection in parallel, the 5th pin (RT) of step-down chip (U2) is the 42 resistance (R70) and thermo-sensitive resistor (TH1) ground connection by connecting successively, the 5th pin (RT) of step-down chip (U2) is connected to the collector electrode of the 4th triode (Q10), the grounded emitter of the 4th triode (Q10), the base stage of the 4th triode (Q10) is connected to the first dual operational amplifier chip (U7), second output, 7 pin by the 43 resistance (R64), is connected with the 44 resistance (R65) between the base stage of the 4th triode (Q10) and the emitter; The 1st pin (GD) ground connection of step-down chip (U2), the 2nd pin are by the 14 electric capacity (C15) ground connection, and the 4th pin is by the 45 resistance (R25) ground connection;
First end of the secondary side of described transformer (T2) first winding is connected to the anode of the 5th voltage stabilizing didoe (D13), the negative electrode of the 5th voltage stabilizing didoe (D13) is connected to the anode of LED lamp (600) successively by the 3rd inductance (L4) and the 4th inductance (L5), the two ends of the 5th voltage stabilizing didoe (D13) are connected with the 15 electric capacity (C19) and the 46 resistance (R36) of series connection, the second end ground connection of the secondary side of described transformer (T2) first winding, the negative electrode of the 5th voltage stabilizing didoe (D13) is by second electrochemical capacitor (C20) ground connection, node between the 3rd inductance (L4) and the 4th inductance (L5) is by the 3rd electrochemical capacitor (C21) ground connection, the negative electrode of LED lamp (600) is connected with the 16 electric capacity (C22) by the 47 resistance (R37) ground connection between the anode of LED lamp (600) and the negative electrode.
7. direct current input LED control circuit according to claim 6, it is characterized in that, described feedback circuit (400) comprises the second dual operational amplifier chip (U5) at least, the 8th pin of the second dual operational amplifier chip (U5) links to each other with the anode of LED lamp (600), the anode of LED lamp (600) is the 48 resistance (R39) by connecting successively, the 49 resistance (R46) and the 50 resistance (R47) ground connection, node between the 48 resistance (R39) and the 49 resistance (R46) is connected to first inverting input, 2 pin of the second dual operational amplifier chip (U5), first inverting input, 2 pin of the second dual operational amplifier chip (U5) are by the 17 electric capacity (C31) ground connection, first in-phase input end, 3 pin of the second dual operational amplifier chip (U5) are by the 18 electric capacity (C29) ground connection, the ground end of the second dual operational amplifier chip (U5) or negative voltage side 4 pin ground connection;
The anode of LED lamp (600) also passes through the 51 resistance (R41) of series connection successively, the 52 resistance (R44) and the 53 resistance (R45) ground connection, node between the 52 resistance (R44) and the 53 resistance (R45) is connected to second in-phase input end, 5 pin of the second dual operational amplifier chip (U5), second in-phase input end, 5 pin of the second dual operational amplifier chip (U5) are by the 19 electric capacity (C30) ground connection, power end 8 pin of the second dual operational amplifier chip (U5) are by the 20 electric capacity (C27) ground connection, second inverting input, 6 pin of the second dual operational amplifier chip (U5) link to each other with the negative electrode of LED lamp (600) by the 54 resistance (R38), second inverting input, 6 pin are by the 21 electric capacity (C28) ground connection, be connected with the 22 electric capacity (C25) between second inverting input, 6 pin of the second dual operational amplifier chip (U5) and second output, 7 pin, also be connected with the 23 electric capacity (C26) and the 55 resistance (R43) of series connection between the 6th pin of the second dual operational amplifier chip (U5) and the 7th pin;
First output, 1 pin of the second dual operational amplifier chip (U5) is connected to the negative electrode of the 9th diode (D15), the anode of the 9th diode (D15) is connected to the negative electrode of first opto-coupler chip (U3) input side, power end 8 pin of the second dual operational amplifier chip (U5) are connected to the negative electrode of the tenth diode (D14), the anode of the tenth diode (D14) is connected to the negative electrode of first opto-coupler chip (U3) input side, the anode of first opto-coupler chip (U3) input side is connected to the anode of LED lamp (600) by the 56 resistance (R40), the anode of first opto-coupler chip (U3) outlet side is connected to the 2nd pin (FB) of step-down chip (U2), the minus earth of first opto-coupler chip (U3) outlet side.
8. direct current input LED control circuit according to claim 7, it is characterized in that, described output detection circuit (500) comprises second opto-coupler chip (U4) and the second voltage reference source chip (U6) at least, the anode of LED lamp (600) is connected to the anode of second opto-coupler chip (U4) input side by the 57 resistance (R48), the negative electrode of second opto-coupler chip (U4) input side is connected to the control end of the second voltage reference source chip (U6), the negative electrode of second opto-coupler chip (U4) input side is connected to the anode of LED lamp (600) by the 58 resistance (R49), the anode of LED lamp (600) is connected to the sampling end of second opto-coupler chip (U4) by the 59 resistance (R50), and the sampling end of second opto-coupler chip (U4) is by the 60 resistance (R51) in parallel, the 61 resistance (R52) and the 24 electric capacity (C32) ground connection.
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| CN 200910109658 CN101711070B (en) | 2009-11-18 | 2009-11-18 | LED direct-current input control circuit |
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|---|---|---|---|
| CN 200910109658 CN101711070B (en) | 2009-11-18 | 2009-11-18 | LED direct-current input control circuit |
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| CN101711070B CN101711070B (en) | 2013-05-08 |
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| CN 200910109658 Expired - Fee Related CN101711070B (en) | 2009-11-18 | 2009-11-18 | LED direct-current input control circuit |
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| CN112996190B (en) * | 2021-04-15 | 2022-03-15 | 珠海美光原科技股份有限公司 | 200W LED driving power circuit |
| CN112996190A (en) * | 2021-04-15 | 2021-06-18 | 珠海美光原科技股份有限公司 | 200W LED driving power circuit |
| CN113098250A (en) * | 2021-06-09 | 2021-07-09 | 深圳市赛迈科技有限公司 | Power supply circuit and vehicle-mounted power supply |
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| Publication number | Publication date |
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| CN101711070B (en) | 2013-05-08 |
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