CN101711070B - LED direct-current input control circuit - Google Patents
LED direct-current input control circuit Download PDFInfo
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- CN101711070B CN101711070B CN 200910109658 CN200910109658A CN101711070B CN 101711070 B CN101711070 B CN 101711070B CN 200910109658 CN200910109658 CN 200910109658 CN 200910109658 A CN200910109658 A CN 200910109658A CN 101711070 B CN101711070 B CN 101711070B
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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 the locomotive light in colliery adopts to a plurality of load supplyings, causes its change in voltage very large due to needs.On the other hand; the locomotive light that use in the colliery of colliery industry transportation now mainly has following shortcoming: the 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 is not enough are not suitable for using for a long time in the down-hole.And existing locomotive light in use often because extremely extinguishing 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: for the defective that above-mentioned input voltage range is narrow and defencive function is not enough 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 to wide voltage and carry out voltage stabilizing, and can carry out the direct current input LED control circuit of over-and under-voltage protection.
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;
The booster circuit that is connected with described input detecting circuit is used for direct current signal is boosted;
The reduction voltage circuit that is connected with described booster circuit is used for direct current signal is carried out step-down, and is output as the power supply of LED lamp;
The feedback circuit that is connected with described reduction voltage circuit for detection of the voltage and current of described reduction voltage circuit output, sends corresponding feedback control signal to described reduction voltage circuit, thereby realizes the control to the output signal constant pressure and flow;
Wherein, described input detecting circuit is when the direct current signal overvoltage that input detected, and output the first overvoltage cut-off signals is given described booster circuit, 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 step-down; Described input detecting circuit is when the direct current signal that input detected is under-voltage, and output undervoltage turnoff signal is given described booster circuit and reduction voltage circuit, is used for turn-offing 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 overvoltage is protected to input undervoltage, and effectively protective circuit is not damaged; Constant current is carried out in output, can be made constant output current, light source luminescent is constant; Circuit is carried out overheat protector, and when preventing high temperature, wiring board is damaged; Overvoltage protection is carried out in output, when circuit output has when abnormal, effectively protect external load.The shortcomings such as circuit of the present invention can solve the colliery locomotive light effectively, and input voltage range is narrow, light source life is short, light efficiency is low, defencive function is not enough.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in 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, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit 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 present invention, mainly comprise input detecting circuit 100, booster circuit 200, reduction voltage circuit 300 and feedback circuit 400.
Input detecting circuit 100 is used for the direct current signal of input is detected.When the direct current signal that input detected is in preset range, DC signal output is arrived booster circuit 200; Booster circuit 200 is connected with input detecting circuit 100, is used for direct current signal is boosted; Reduction voltage circuit 300 is connected with booster circuit 200, is used for direct current signal is carried out step-down, and is output as 600 power supplies of LED lamp; Feedback circuit 400 is connected with described reduction voltage circuit 300, for detection of the voltage and current of described reduction voltage circuit 300 outputs, sends corresponding feedback control signal to described reduction voltage circuit 300, thereby realizes the control to the output signal constant pressure and flow.
Described input detecting circuit 100 is when the direct current signal overvoltage that input detected, and output the first overvoltage cut-off signals is given described booster circuit 200, 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 step-down.
Described input detecting circuit 100 is when the direct current signal that input detected is under-voltage; output undervoltage turnoff signal is given described booster circuit 200; and export simultaneously the undervoltage turnoff signal to described reduction voltage circuit 300, thus 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, to realize input overvoltage and under-voltage protection, and carried out FEEDBACK CONTROL by 400 pairs of direct current signals of feedback circuit, the direct current signal of stable output is 600 power supplies of LED lamp.
Realizing basic constant pressure and flow, and after the overvoltage and under-voltage protection function of input, the present invention also realizes by increasing output detection circuit 500 overvoltage protection exported.Described output detection circuit 500 is connected 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 output detected, export the second overvoltage cut-off signals to described reduction voltage circuit 300, to turn-off described reduction voltage circuit 300.
It is worth mentioning 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 the direct current signal of input when the input overcurrent.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 is connected 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 is connected by the electrode input end of the first inductance L 1 with described direct current input LED control circuit, be connected with the first resistance R 1 between the collector electrode of the first triode Q1 and base stage, the base stage of the first triode Q1 is connected 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 is connected with the negative electrode of the second voltage stabilizing didoe ZD2, be connected with the second resistance R 2 between the anode of the emitter of the first triode Q1 and the second voltage stabilizing didoe ZD2, the control end of the first voltage reference source chip U8 is connected with the anode of described the second voltage stabilizing didoe ZD2 by the 3rd resistance R 3, the anode of the second voltage stabilizing didoe ZD2 is by the first capacitor C 2 ground connection, be connected with the second capacitor C 4 between the control end of the first voltage reference source chip U8 and earth terminal, its earth terminal ground connection, control end is connected 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, the 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, the 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, the node between the 7th resistance R 9 and the 8th resistance R 6 is by the 3rd capacitor C 3 parallel with one another, the 9th resistance R 8, the tenth resistance R 7 ground connection, the 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, the second in-phase input end 5 pin of the first dual operational amplifier chip U7 are connected with the sampling end of the first voltage reference source chip U8 by the 11 resistance R 12, the second inverting input 6 pin of the first dual operational amplifier chip U7 are successively by the 12 resistance R 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, the second output 7 pin of the first dual operational amplifier chip U7 are connected with the 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, the second in-phase input end 5 pin of the first dual operational amplifier chip U7 are connected with the anode of the second voltage stabilizing didoe ZD2, the first output 1 pin of the first dual operational amplifier chip U7 is connected with the anode of the first diode D1, the second output 7 pin of the first dual operational amplifier chip U7 are connected 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 is connected with the negative electrode of the first diode D1, the collector electrode of the first triode Q1 connects booster circuit 200 as the output of direct current signal, output connects booster circuit 200 to the negative electrode of the first diode D1 as control signal.
As reference voltage, and form an overvoltage and under-voltage decision circuitry by voltage-stabiliser tube ZD1 and ZD2, triode Q1 and a plurality of resistance capacitance R1, R2... etc. with reference voltage stabilizing source U8, the voltage of the direct current signal of input is judged.Wherein, the voltage signal of voltage reference source chip U8 is input to respectively the reverse input end of the first amplifier after treatment, and the input in the same way of the second amplifier is as the first reference voltage and the second reference voltage.And correspondingly, direct-flow input signal is connected with the input in the same way of the first amplifier and the reverse input end of the second amplifier.The first and second amplifiers are respectively for the first reference voltage and direct-flow input signal, the size of the second reference voltage and direct-flow input signal judges, pass through signal output pin the 1st corresponding first overvoltage cut-off signals of pin output of the first amplifier of the first dual operational amplifier chip U7 when the direct current signal overvoltage that input detected, signal output pin the 7th pin by the second amplifier when the direct current signal that input detected 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, the second inductance L 2, the 3rd diode D5, the first electrochemical capacitor C9, the first field effect transistor Q6 at least; The first end of the second inductance L 2 is connected with the collector electrode of the first triode Q1, and the second end of the 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, the anodic bonding of the first end of the second inductance L 2 and the 3rd diode D5, the negative electrode of the 3rd diode D5 is connected with the negative electrode of the 4th diode D6; The anode of the 4th diode D6 is connected 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 7, the 20 resistance R 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, the 6th pin DR of chip U1 of the boosting output PWM ripple that is connected with the grid of the first field effect transistor Q6 is controlled the turn-on and turn-off of field effect transistor Q6, boost the 7th pin FFA of chip U1 by the 23 resistance R 16 ground connection, and be connected with the negative electrode of above-mentioned the 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 is connected 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 is connected with the anode of above-mentioned the 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, the 25 resistance R 14 is connected 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 is connected 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 is connected 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; Boosting chip U1 can be big or small according to the feedback signal that the 3rd pin gathers, the duty ratio of regulation output PWM ripple, thus control booster circuit 200 output end voltages sizes.
Simultaneously, the first output pin 1 pin of described the 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 the second amplifier of described the first dual operational amplifier chip U7 i.e. the 7th pin also is connected with the 7th pin FFA of the described chip U1 that boosts by diode D2, for delivery of 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 is connected 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 the 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 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 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, 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 the 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 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 first dual operational amplifier chip U7 the second output 7 pin by the 43 resistance R 64, be that 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 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.
the first end of the secondary side of described transformer T2 the 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 the 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 by the 47 resistance R 37 ground connection, be connected with the 16 capacitor C 22 between the anode of LED lamp 600 and negative electrode.
Step-down chip U2 is connected with the grid of the second field effect transistor Q3 by the 8th pin G output PWM ripple signal, thereby controls the turn-on and turn-off time of 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 whole circuit no-output.Therefore, control circuit of the present invention can effective protective circuit not be damaged when high temperature.
By above-mentioned input detecting circuit 100, booster circuit 200 and reduction voltage circuit 300, because using, this circuit consisted of 2 grades of conversion, namely first boost through booster circuit 200, then through reduction voltage circuit 300 step-downs.Just can realize detection and adjusting to the input of wide voltage, make this circuit can be in input voltage 11V stable work in the wide region of 80V.When input voltage greater than 11V during lower than 45V, 1 pin of the first dual operational amplifier chip U7, the 7 equal output low levels of pin, the chip U1 that boosts normal operation, booster circuit 200 circuit are elevated to 65V with input voltage.When input voltage during lower than 10V, the 7 pin output high level of the first dual operational amplifier chip U7, the chip U1 that boosts quits work, and the chip of step-down simultaneously U2 quits work, and circuit 300 quits work, whole circuit no-output.When input voltage during greater than 45V, the 1 pin output high level of the first dual operational amplifier chip U7, 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.
It is worth mentioning that, this circuit also utilizes the second segment 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 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 is connected 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 the first inverting input 2 pin of the second dual operational amplifier chip U5, the first inverting input 2 pin of the second dual operational amplifier chip U5 are by the 17 capacitor C 31 ground connection, the 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 the second in-phase input end 5 pin of the second dual operational amplifier chip U5, the 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, the second inverting input 6 pin of the second dual operational amplifier chip U5 are connected with the negative electrode of LED lamp 600 by the 54 resistance R 38, the second inverting input 6 pin are by the 21 capacitor C 28 ground connection, be connected with the 22 capacitor C 25 between the second inverting input 6 pin of the second dual operational amplifier chip U5 and the second output 7 pin, also be connected with the 23 capacitor C 26 and the 55 resistance R 43 of series connection between the second inverting input 6 pin of the second dual operational amplifier chip U5 and the second output 7 pin.
the first output 1 pin of the second dual operational amplifier chip U5 is connected to the negative electrode of the 9th diode D15, the anodic bonding of the 9th diode D15 is 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 anodic bonding of the tenth diode D14 is 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 anodic bonding of the first opto-coupler chip U3 outlet side is 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 that gather, thereby regulates the voltage and current of the direct current signal of step-down chip U2 output.
The present invention also realizes by increasing output detection circuit 500 overvoltage protection exported.described output detection circuit 500 comprises the second opto-coupler chip U4 and second voltage a 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 second voltage a 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, 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 second voltage a 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 input undervoltage protection, output overvoltage protection circuit, the functions such as overheat protector simultaneously.The 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 control circuit is provided, 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 use procedure.
The above is only preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
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 is connected with described input detecting circuit (100) is used for direct current signal is boosted;
The reduction voltage circuit (300) that is connected 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 is connected with described reduction voltage circuit (300), voltage and current for detection of described reduction voltage circuit (300) output, send corresponding feedback control signal to described reduction voltage circuit (300), thereby realize the control to the output signal constant pressure and flow;
Wherein, described input detecting circuit (100) is when the direct current signal overvoltage that input detected, export the first overvoltage cut-off signals to 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 step-down; Described input detecting circuit (100) is when the direct current signal that input detected is under-voltage, output undervoltage turnoff signal is given described booster circuit (200) and reduction voltage circuit (300), be used for turn-offing described booster circuit (200) and reduction voltage circuit (300), circuit is carried out under-voltage 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) and the first voltage reference source chip (U8) at least, wherein, the collector electrode of the first triode (Q1) is connected by the electrode input end of the first inductance (L1) with described direct current input LED control circuit, be connected with the first resistance (R1) between the collector electrode of the first triode (Q1) and base stage, the base stage of the first triode (Q1) is connected 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) is connected with the negative electrode of the second voltage stabilizing didoe (ZD2), be connected with the second resistance (R2) between the anode of the emitter of the first triode (Q1) and the second voltage stabilizing didoe (ZD2), the control end of the first voltage reference source chip (U8) is connected with the anode of described the second voltage stabilizing didoe (ZD2) by the 3rd resistance (R3), the anode of the second voltage stabilizing didoe (ZD2) is by the first electric capacity (C2) ground connection, be connected with the second electric capacity (C4) between the control end of the first voltage reference source chip (U8) and earth terminal, its earth terminal ground connection, control end is connected 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), the 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 the 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 the 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, the 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), the second in-phase input end 5 pin of the first dual operational amplifier chip (U7) are connected with the sampling end of the first voltage reference source chip (U8) by the 11 resistance (R12), the 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 node between the 12 resistance (R63) and the 13 resistance (R62) meets the first triode (Q1) by the 14 resistance (R60) in parallel and the 15 resistance (R61), the second output 7 pin of the first dual operational amplifier chip (U7) are connected with the 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), the second in-phase input end 5 pin of the first dual operational amplifier chip (U7) are connected with the anode of the second voltage stabilizing didoe (ZD2), the first output 1 pin of the first dual operational amplifier chip (U7) is connected with the anode of the first diode (D1), the second output 7 pin of the first dual operational amplifier chip (U7) are connected with the anode of the second diode (D2), the negative electrode of the second diode (D2) is connected with the negative electrode of the first diode (D1), the collector electrode of the first triode (Q1) connects booster circuit (200) as the output of direct current signal, output connects booster circuit (200) to the negative electrode of the first diode (D1) as control signal.
2. direct current according to claim 1 is inputted the LED control circuit, it is characterized in that, also comprise output detection circuit (500), be connected with described reduction voltage circuit (300), voltage for detection of described reduction voltage circuit (300) output, when overvoltage being detected, output the second overvoltage cut-off signals is given 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 the direct current signal of input when the input overcurrent.
4. direct current according to claim 3 is inputted the LED control circuit, it is characterized in that, described booster circuit (200) comprises that at least model is the chip that boosts (U1), the second inductance (L2), the 3rd diode (D5), the first electrochemical capacitor (C9) and the first field effect transistor (Q6) of LM3478; The first end of the second inductance (L2) is connected with the collector electrode of the first triode (Q1), and the second end of the 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 the first electrochemical capacitor (C9) ground connection of forward, the anodic bonding of the first end of the second inductance (L2) and the 3rd diode (D5), the negative electrode of the 3rd diode (D5) is connected with the negative electrode of the 4th diode (D6); The anode of the 4th diode (D6) is connected 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 (R18) ground connection in parallel; The grid of the 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 is connected with the grid of the first field effect transistor (Q6), boost the 7th pin (FFA) of chip (U1) by the 23 resistance (R16) ground connection, and be connected with the negative electrode of the 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 is connected with the emitter of the second triode (Q2), the collector electrode of the second triode (Q2) is connected with the anode of the second voltage stabilizing didoe (ZD2) by reverse the 5th diode (D3), the collector electrode of the second triode (Q2) is successively by the 25 resistance (R14) and the 4th voltage stabilizing didoe (ZD4) ground connection, the 25 resistance (R14) is connected with the base stage 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 is connected 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) is connected 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.
5. direct current input LED control circuit according to claim 4, is characterized in that, described reduction voltage circuit (300) comprises that at least model is step-down chip (U2) and the transformer (T2) of OB2269, 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) is connected 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 the first winding of transformer (T2), the grid of the second field effect transistor (Q3) is connected to the 8th pin (G) of step-down chip (U2) by the 7th diode (D11) of forward, be connected with the 36 resistance (R26) between the anode of the 7th diode (D11) and negative electrode, the source electrode of the second field effect transistor (Q3) is by the 37 resistance (R29) ground connection, be connected with the 38 resistance (R27) between the second field effect transistor (Q3) grid and 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 (R28), 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 the 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 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 first dual operational amplifier chip (U7) the second output 7 pin by the 43 resistance (R64), be connected with the 44 resistance (R65) between the base stage of the 4th triode (Q10) and 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,
the first end of the secondary side of described transformer (T2) the 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) the 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 (L4) and the 4th inductance (L5) is by the 3rd electrochemical capacitor (C21) ground connection, the negative electrode of LED lamp (600) is by the 47 resistance (R37) ground connection, be connected with the 16 electric capacity (C22) between the anode of LED lamp (600) and negative electrode.
6. direct current according to claim 5 is inputted the LED control circuit, 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) is connected 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 the first inverting input 2 pin of the second dual operational amplifier chip (U5), the first inverting input 2 pin of the second dual operational amplifier chip (U5) are by the 17 electric capacity (C31) ground connection, the 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 the second in-phase input end 5 pin of the second dual operational amplifier chip (U5), the 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, the second inverting input 6 pin of the second dual operational amplifier chip (U5) are connected with the negative electrode of LED lamp (600) by the 54 resistance (R38), the second inverting input 6 pin are by the 21 electric capacity (C28) ground connection, be connected with the 22 electric capacity (C25) between the second inverting input 6 pin of the second dual operational amplifier chip (U5) and the 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,
the first output 1 pin of the second dual operational amplifier chip (U5) is connected to the negative electrode of the 9th diode (D15), the anodic bonding of the 9th diode (D15) is 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 anodic bonding of the tenth diode (D14) is 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 (R40), the anodic bonding of the first opto-coupler chip (U3) outlet side is to the 2nd pin (FB) of step-down chip (U2), the minus earth of the first opto-coupler chip (U3) outlet side.
7. direct current according to claim 6 is inputted the LED control circuit, it is characterized in that, described output detection circuit (500) comprises the second opto-coupler chip (U4) and second voltage a reference source chip (U6) at least, the anode of LED lamp (600) is connected to the anode of the second opto-coupler chip (U4) input side by the 57 resistance (R48), the negative electrode of the second opto-coupler chip (U4) input side is connected to the control end of second voltage a reference source chip (U6), the negative electrode of the 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 the second opto-coupler chip (U4) by the 59 resistance (R50), the sampling end of the 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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| CN102647820A (en) * | 2011-02-18 | 2012-08-22 | 海洋王照明科技股份有限公司 | LED (light emitting diode) drive circuit |
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| DE102013210261B4 (en) * | 2013-06-03 | 2018-03-22 | Lisa Dräxlmaier GmbH | Lighting device for a vehicle |
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| CN108196184B (en) * | 2018-01-25 | 2023-06-20 | 昆明理工大学 | XL series boost chip detection device and method |
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| CN109194120B (en) * | 2018-10-16 | 2021-09-24 | 深圳成为控股有限公司 | Step-down converter with output protection |
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