CN103889124B - LED light emission device, LED drive circuit and constant current driving governor thereof - Google Patents
LED light emission device, LED drive circuit and constant current driving governor thereof Download PDFInfo
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- CN103889124B CN103889124B CN201410121142.3A CN201410121142A CN103889124B CN 103889124 B CN103889124 B CN 103889124B CN 201410121142 A CN201410121142 A CN 201410121142A CN 103889124 B CN103889124 B CN 103889124B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/20—Responsive to malfunctions or to light source life; for protection
- H05B47/24—Circuit arrangements for protecting against overvoltage
Abstract
The invention belongs to LED Driving technique field, provide a kind of LED light emission device, LED drive circuit and constant current driving governor thereof.The present invention adopts the constant current driving governor comprising oscillator module, main control module, switch module, output electric current measure module, peak current detection module and overvoltage detection module in LED drive circuit, and its circuit structure is simple, and volume is little, detected by the output current of output electric current measure module to switch module, and adjust output current to reach the object of constant current output according to testing result control switch module according to pre-set current value by main control module, and when peak current detection module detects that the peak current of switch module is excessive or overvoltage detection module detects that the output voltage of the output-stage circuit of LED drive circuit is excessive, stopped exporting direct current to realize overcurrent or overvoltage protection according to control switch module by main control module, improve driving reliability, and be conducive to the useful life extending LED.
Description
Technical field
The invention belongs to LED Driving technique field, particularly relate to a kind of LED light emission device, LED drive circuit and constant current driving governor thereof.
Background technology
At present, because LED illumination light source has the advantages such as environmental protection, energy-conservation, life-span be long, it has been regarded as 21st century lighting source most with prospects.In recent years, along with the development of LED illumination technology, LED illumination light source has started progressively to replace conventional light source and has been widely used in various lighting, and this also makes the requirement of user to LED illumination light source more and more higher, wherein, the most outstanding demand is pursued frivolous exactly, and it requires circuit miniaturization and flattening, and under many circumstances, most existing Switching Power Supply cannot reach corresponding volume requirement due to the restriction of the large volume components and parts such as transformer or clavate inductance.
For the requirement of foregoing circuit miniaturization, prior art replaces conventional Switching Power Supply to reach the object reducing circuit volume by adopting the comparatively simple capacitance-resistance voltage reduction circuit of structure in LED drive circuit.Although adopt capacitance-resistance voltage reduction circuit can realizing circuit miniaturized; but LED drive circuit can be caused cannot to realize current peak control and overvoltage protection; and then cause the reliability of circuit to reduce, and can make shorten and not reach expected life requirement the useful life of LED.
Summary of the invention
The object of the present invention is to provide a kind of constant current driving governor, be intended to solve that system bulk existing for prior art is large, reliability is low and the problem that can make shorten the useful life of LED.
The present invention realizes like this, a kind of constant current driving governor, be connected with the input stage current rectifying and wave filtering circuit in LED drive circuit and output-stage circuit, described input stage current rectifying and wave filtering circuit exports direct current to described constant current driving governor after doing rectifying and wave-filtering process to alternating current, the DC powered LED load work that described output-stage circuit exports according to described constant current driving governor; Described constant current driving governor comprises:
Oscillator module, main control module, switch module, output electric current measure module, peak current detection module and overvoltage detection module;
The output of described oscillator module is connected with the clock signal terminal of the input of described main control module and described output electric current measure module, the output of described main control module connects the controlled end of described switch module, input and the output of described switch module are connected the output of described input stage current rectifying and wave filtering circuit and the input of described output-stage circuit respectively, test side and the output of described output electric current measure module are connected the output of described switch module and the current detection feedback end of described main control module respectively, test side and the output of described peak current detection module are connected the sample rate current end of described switch module and the peakvalue's checking feedback end of described main control module respectively, test side and the output of described overvoltage detection module are connected the output voltage sampling end of described output-stage circuit and the overvoltage detection feedback end of described main control module respectively,
Described oscillator module provides square-wave signal for described main control module and described output electric current measure module;
The described output electric current measure module pair output voltage corresponding with the output current of described switch module detects, and correspondingly output electric current measure feedback signal to described main control module; Described main control module controls described switch module according to described current sense feedback signal and adjusts output current according to pre-set current value;
Described peak current detection module detects the crest voltage corresponding to the peak current flowing through described switch module, and correspondingly exports peakvalue's checking feedback signal to described main control module; When described crest voltage is greater than crest voltage threshold value, described main control module controls described switch module according to described peakvalue's checking feedback signal to be stopped exporting direct current;
The output voltage of described overvoltage detection module to described output-stage circuit detects, and correspondingly output overvoltage detection signal to described main control module; When the output voltage of described output-stage circuit is greater than overvoltage threshold, described main control module controls described switch module according to described overvoltage detection signal to be stopped exporting direct current.
Another object of the present invention is also to provide a kind of LED drive circuit, and it comprises input stage current rectifying and wave filtering circuit and output-stage circuit, and described LED drive circuit also comprises above-mentioned constant current driving governor.
Another object of the present invention is also to provide a kind of LED light emission device, and it comprises LED load, and also comprises above-mentioned LED drive circuit.
The present invention adopts the constant current driving governor comprising oscillator module, main control module, switch module, output electric current measure module, peak current detection module and overvoltage detection module in LED drive circuit, and its circuit structure is simple, and volume is little, detected by the output current of output electric current measure module to switch module, and adjust output current to reach the object of constant current output according to testing result control switch module according to pre-set current value by main control module, peak current detection module detects the peak current flowing through switch module in each switch periods of switch module, the output voltage of overvoltage detection module to the output-stage circuit of LED drive circuit detects, when peak current detection module detects that the peak current of switch module is excessive or overvoltage detection module detects that the output voltage of the output-stage circuit of LED drive circuit is excessive, stopped exporting direct current to realize overcurrent or overvoltage protection according to control switch module by main control module, thus improve the functional reliability of constant current driving governor, and be conducive to the useful life extending LED, the system bulk solved existing for prior art is large, low and the problem that can make shorten the useful life of LED of reliability.
Accompanying drawing explanation
Fig. 1 is the function structure chart of the constant current driving governor that the embodiment of the present invention provides;
Fig. 2 is the exemplary circuit structure chart of the constant current driving governor that the embodiment of the present invention provides;
Fig. 3 is the structural representation of the LED drive circuit that the embodiment of the present invention provides;
Fig. 4 is the exemplary circuit structure chart of the LED drive circuit that the embodiment of the present invention provides.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, 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, be not intended to limit the present invention.
Fig. 1 shows the modular structure of the constant current driving governor that the embodiment of the present invention provides, and for convenience of explanation, illustrate only the part relevant to the embodiment of the present invention, details are as follows:
Constant current driving governor 100 is connected with the input stage current rectifying and wave filtering circuit 200 in LED drive circuit and output-stage circuit 300, export direct current to constant current driving governor 100 after input stage current rectifying and wave filtering circuit 200 couples of alternating current AC do rectifying and wave-filtering process, the DC powered LED load 400 that output-stage circuit exports according to constant current driving governor 100 works.
Constant current driving governor 100 comprises oscillator module 101, main control module 102, switch module 103, output electric current measure module 104, peak current detection module 105 and overvoltage detection module 106.
The output of oscillator module 101 is connected with the clock signal terminal of the input of main control module 102 and output electric current measure module 104, the controlled end of the output connecting valve module 103 of main control module 102, input and the output of switch module 103 are connected the output of input stage current rectifying and wave filtering circuit 200 and the input of output-stage circuit 300 respectively, the test side of output electric current measure module 104 and output be the output of connecting valve module 103 and the current detection feedback end of main control module 102 respectively, the test side of peak current detection module 105 and output be the sample rate current end of connecting valve module 103 and the peakvalue's checking feedback end of main control module 102 respectively, test side and the output of overvoltage detection module 106 are connected the output voltage sampling end of output-stage circuit 300 and the overvoltage detection feedback end of main control module 102 respectively.
Oscillator module 101 provides square-wave signal for main control module 102 and output electric current measure module 104, and the frequency of this square-wave signal is variable; According to embody rule situation, the exportable square-wave signal with corresponding frequencies of oscillator module 101.
Output electric current measure module 104 detects the output voltage corresponding with the output current of switch module 103, and correspondingly output electric current measure feedback signal to main control module 102; Main control module 102 adjusts output current according to this current sense feedback signal control switch module 103 according to pre-set current value.
Peak current detection module 105 detects the crest voltage corresponding to the peak current flowing through switch module 103, and correspondingly exports peakvalue's checking feedback signal to main control module 102; When above-mentioned crest voltage is greater than crest voltage threshold value, main control module 102 stops exporting direct current according to this peakvalue's checking feedback signal control switch module 103.
The output voltage of overvoltage detection module 106 pairs of output-stage circuits 300 detects, and correspondingly output overvoltage detection signal to main control module 103; When the output voltage of output-stage circuit 300 is greater than overvoltage threshold, main control module 102 stops exporting direct current according to above-mentioned overvoltage detection signal control switch module 103.
Fig. 2 shows the exemplary circuit structure of the constant current driving governor 100 shown in Fig. 1, and for convenience of explanation, illustrate only the part relevant to the embodiment of the present invention, details are as follows:
Oscillator module 101 is the conventional oscillating circuit that can produce the square-wave signal with characteristic frequency.
Main control module 102 comprises:
First not gate U1, delay circuit 1021, second not gate U2, first and door U3, second and door U4, the 3rd not gate U5, the first NOR gate U6, the 4th not gate U7, the first NAND gate U8, the second NOR gate U9, the 3rd with door U10 and the 4th and door U11;
The common contact of the input of the first not gate U1 and the input of the 4th not gate U7 is the input of main control module 102, the output of the first not gate U1 connects the input and first and the first input end 1 of door U3 of delay circuit 1021 simultaneously, input and the output of the second not gate U2 are connected the output and first and second input 2 of door U3 of delay circuit 1021 respectively, second is the current detection feedback end of main control module 102 with the first input end 1 of door U4, second to be connected with second input 2 of door U4 first with the output 3 of door U3, second is connected the input of the 3rd not gate U5 and the first input end 1 of the first NOR gate U6 with the output of door U4 simultaneously, the output of the 3rd not gate U5 connects the first input end 1 of the 3rd and door U10, the output of the 4th not gate U7 connects the first input end 1 of the first NAND gate U8, second input 2 of the first NAND gate U8 is the peakvalue's checking feedback end of main control module 102, first input end 1 and second input 2 of the second NOR gate U9 are connected the output 3 of the first NOR gate U6 and the output 3 of the first NAND gate U8 respectively, the output 3 of the second NOR gate U9 and second input 2 of the first NOR gate U6 are connected to second input 2 of the 3rd and door U10 altogether, 4th overvoltage being respectively main control module 102 with the first input end 1 of door U11 and output 3 detects feedback end and output, 4th to be connected with second input 2 of door U11 the 3rd with the output 3 of door U10.Wherein, delay circuit 1021 is the conventional delay circuits be made up of multiple not gate, and it carries out delay process for the signal exported the first not gate U1.
Switch module 103 comprises:
First NMOS tube Q1, the second NMOS tube Q2 and the first resistance R1;
The common contact of the grid of the first NMOS tube Q1 and the grid of the second NMOS tube Q2 is the controlled end of switch module 103, the common contact of the drain electrode of the first NMOS tube Q1 and the drain electrode of the second NMOS tube Q2 is the input of switch module 103, the source electrode of the first NMOS tube Q1 is the output of switch module 103, the common contact of the source electrode of the second NMOS tube Q2 and the first end of the first resistance R1 is the sample rate current end of switch module 103, the second termination equipotential ground of the first resistance R1.
Output electric current measure module 104 comprises:
First reference voltage source 1041, first comparator U12 and d type flip flop U13;
The output of the first reference voltage source 1041 connects the inverting input of the first comparator U12, the in-phase input end of the first comparator U12 is the test side of output electric current measure module 104, the output of the first comparator U12 connects the input D of d type flip flop U13, the clock end CLK of d type flip flop U13 is the clock signal terminal of output electric current measure module 104, the in-phase output end Q sky of d type flip flop U13 connects, the reversed-phase output of d type flip flop U13
for the output of output electric current measure module 104.Wherein, the first reference voltage source 1041 can be specifically the conventional reference voltage generating circuit being core with reference voltage source chip TL431, and it is for providing the reference voltage corresponding with above-mentioned pre-set current value to the first comparator U12.
Peak current detection module 105 comprises the second reference voltage source 1051 and the second comparator U14, the output of the second reference voltage source 1051 connects the in-phase input end of the second comparator U14, and the inverting input of the second comparator U14 and output are respectively test side and the output of peak current detection module 105.Wherein, the second reference voltage source 1051 can be specifically the conventional reference voltage generating circuit being core with reference voltage source chip TL431, and it is for providing above-mentioned crest voltage threshold value to the second comparator U14.
Overvoltage detection module 106 comprises:
3rd reference voltage source 1061, the 3rd comparator U15, the first electric capacity C1, the 5th not gate U16 and the 6th not gate U17;
The output of the 3rd reference voltage source 1061 connects the in-phase input end of the 3rd comparator U15, the inverting input of the 3rd comparator U15 is the test side of overvoltage detection module 106, the output of the 3rd comparator U15 and the first end of the first electric capacity C1 are connected to the input of the 5th not gate U16 altogether, the second termination equipotential ground of the first electric capacity C1, the output of the 5th not gate U16 connects the input of the 6th not gate U17, and the output of the 6th not gate U17 is the output of overvoltage detection module 106.Wherein, 3rd reference voltage source 1061 can be specifically the conventional reference voltage generating circuit being core with reference voltage source chip TL431; it is for providing a reference voltage (namely above-mentioned overvoltage threshold) to the 3rd comparator U15, and this reference voltage is considered as the overvoltage protection magnitude of voltage of constant current driving governor 100.
Below in conjunction with operation principle, above-mentioned constant current driving governor 100 is described further:
If when the crest voltage corresponding with the output current peak value of switch module 103 (i.e. the voltage of the first resistance R1) is less than output voltage (the namely above-mentioned crest voltage threshold value) of the second reference voltage source 1051, then the second comparator U14 exports high level (namely above-mentioned peakvalue's checking feedback signal) to the first NAND gate U8, and the output voltage of output-stage circuit 300 (i.e. the voltage of the output voltage sampling end of output-stage circuit 300) is when being less than the output voltage of the 3rd reference voltage source 1061, 3rd comparator U15 exports high level, still export after the 5th not gate U16 and the 6th not gate U17 high level (namely above-mentioned overvoltage detection signal) to the 4th with door U11, now, if the voltage of the input of output-stage circuit 300 (i.e. the output voltage corresponding to output current of the source electrode of the first NMOS tube Q1) is greater than the output voltage of the first reference voltage source 1041, first comparator U12 then exports high level, the rising edge of square-wave signal that then d type flip flop U13 exports at oscillator module 101 is sampled this high level, and the first input end 1 of output low level signal to the second and door U4, and keep a cycle of oscillation, the falling edge of the first square-wave signal exported at oscillator module 101 with door U3 produces pulse signal to the second and the door U4 of a duty ratio very little (low level width namely in one-period is much larger than high level width), then second understands output low level with door U4, 3rd not gate U5 export thereupon high level to the 3rd with door U10, simultaneously, the low level be input as in the square-wave signal of oscillator module 101 output of the 4th not gate U7, then now the input signal of the first input end 1 of the first NAND gate U8 is high level, and the input signal of its second input 2 is also high level, then the output signal of the first NAND gate U8 is low level, so the rest-set flip-flop be made up of the first NOR gate U6 and the second NOR gate U9 continues to keep low level output according to the known second NOR gate U9 of its preceding state, then the 3rd with door U10 output low level, 4th with door U11 also thereupon output low level control the first NMOS tube Q1 and the second NMOS tube Q2 and continue to keep closing one-period, to reduce the electric current supply of output-stage circuit 300 to LED load 400,
If the voltage of the input of output-stage circuit 300 (i.e. the output voltage corresponding to output current of the source electrode of the first NMOS tube Q1) is less than the output voltage of the first reference voltage source 1041, first comparator U12 output low level, the rising edge of square-wave signal that then d type flip flop U13 exports at oscillator module 101 is sampled this low level, and export the first input end 1 of high level signal to the second and door U4, and keep a cycle of oscillation, the falling edge of the first square-wave signal exported at oscillator module 101 with door U3 produces pulse signal to the second and the door U4 of a duty ratio very little (low level width namely in one-period is much larger than high level width), then second can export the pulse signal of a duty ratio very little (low level width namely in one-period is much larger than high level width) with door U4, the pulse signal of the 3rd not gate U5 output duty cycle very large (low level width namely in one-period is much smaller than high level width) is thereupon to the 3rd and door U10, simultaneously, the low level be input as in the square-wave signal of oscillator module 101 output of the 4th not gate U7, then now the input signal of the first input end 1 of the first NAND gate U8 is high level, and the input signal of its second input 2 is also high level, then the output signal of the first NAND gate U8 is low level, the rest-set flip-flop be then made up of the first NOR gate U6 and the second NOR gate U9 can change state and make the second NOR gate U9 export high level, then the 3rd export high level with door U10,4th also exports high level with door U11 thereupon controls the first NMOS tube Q1 and the second NMOS tube Q2 opens one-period, to increase the electric current supply of output-stage circuit 300 to LED load 400.
Suppose that the output voltage of the first reference voltage source 1041 is Vref, the sampling resistor of the input end of output-stage circuit 300 is Rcs, then the output current of switch module 103 is that Vref/Rcs(Vref and Rcs is fixed value), as can be seen here, by output electric current measure module 104 with the output voltage of the first reference voltage source 1041 for benchmark, and according to the fluctuation of the output voltage with the first NMOS tube Q1, by main control module 102, above-mentioned switch control rule is carried out to the first NMOS tube Q1 and the second NMOS tube Q2, can repeatedly adjust the output current of switch module 103, thus make the mean value of output current remain unchanged to realize constant current output, improve the drive efficiency to LED load 400.
When the 4th is high level with the output 3 of door U11, first NMOS tube Q1 and the second NMOS tube Q2 conducting, certain mirroring ratios relation is there is between first NMOS tube Q1 and the second NMOS tube Q2, along with the increase of ON time, the electric current flowing through the first resistance R1 can increase gradually, voltage then on the first resistance R1 also increases gradually, when this voltage is greater than the output voltage of the second reference voltage source 1051, second comparator U14 meeting output low level (namely above-mentioned peakvalue's checking feedback signal) is to the first NAND gate U8, first NAND gate U8 exports high level thereupon, second NOR gate U9 output low level, 3rd with door U10 also output low level, so the 4th controls the first NMOS tube Q1 and the second NMOS tube Q2 turns off with door U11 output low level, thus when the output current peak value of switch module 13 is excessive, overcurrent protection is realized to LED load 400.
When the output voltage of output-stage circuit 300 is greater than the output voltage of the 3rd reference voltage source 1061; 3rd comparator U15 meeting output low level; 5th not gate U16 exports high level; 6th not gate U17 output low level (namely above-mentioned overvoltage detection signal) to the 4th with door U11; then the 4th with door U11 thereupon output low level control the first NMOS tube Q1 and the second NMOS tube Q2 turns off, thus when the output voltage of output-stage circuit 300 is excessive, overvoltage protection is realized to LED load 400.
Based on the realization of above-mentioned constant current driving governor 100, the embodiment of the present invention additionally provides a kind of LED drive circuit, and as shown in Figure 3, it is connected with above-mentioned LED load 400, comprises input stage current rectifying and wave filtering circuit 200 and output-stage circuit 300; In addition, this LED drive circuit also comprises above-mentioned constant current driving governor 100.
Particularly, as shown in Figure 4, input stage current rectifying and wave filtering circuit 200 comprises rectifier bridge BD and the second electric capacity C2, the first input end 1 of rectifier bridge BD and the second input 2 incoming transport electricity AC, the common contact of the output 3 of rectifier bridge BD and the first end of the second electric capacity C2 is the output of input stage current rectifying and wave filtering circuit 200, and the earth terminal 4 of rectifier bridge BD and second end of the second electric capacity C2 are connected to ground altogether.
Output-stage circuit 300 comprises:
Diode D1, the second resistance R2, the 3rd electric capacity C3, the 3rd resistance R3, the 4th resistance R4, inductance L 1 and the 4th electric capacity C4;
The first end of the negative electrode of diode D1 and the first end of the second resistance R2 and the 3rd electric capacity C3 connects the input that formed common contact is output-stage circuit 300 altogether, second end of the second resistance R2 and second end of the 3rd electric capacity C3, the first end of the 3rd resistance R3 and the first end of inductance L 1 are connected to equipotential ground altogether, the common contact of second end of the 3rd resistance R3 and the first end of the 4th resistance R4 is the output voltage sampling end of output-stage circuit 300, the common contact of the first end of second end of the 4th resistance R4 and the second end of inductance L 1 and the 4th electric capacity C4 is the output of output-stage circuit 300, and connect the input of LED load 400, the anode of diode D1 and second end of the 4th electric capacity C4 and the output of LED load 400 are connected to ground altogether.Wherein, the second resistance R2 is just equivalent to the sampling resistor Rcs of the input end of output-stage circuit 300 involved in the operation principle of above-mentioned constant current driving governor 100.
The embodiment of the present invention additionally provides a kind of LED light emission device, and it comprises LED load 400, and also comprises above-mentioned LED drive circuit.
In sum, the embodiment of the present invention adopts the constant current driving governor 100 comprising oscillator module 101, main control module 102, switch module 103, output electric current measure module 104, peak current detection module 105 and overvoltage detection module 106 in LED drive circuit, its circuit structure is simple, and volume is little; detected by the output current of output electric current measure module 104 pairs of switch modules 103, and adjust output current to reach the object of constant current output according to testing result control switch module according to pre-set current value by main control module, peak current detection module 105 detects the peak current flowing through switch module 103 in each switch periods of switch module 103, the output voltage of the output-stage circuit of overvoltage detection module 106 pairs of LED drive circuits detects, when peak current detection module 105 detects that the output current peak value of switch module 103 is excessive or overvoltage detection module 106 detects that the output voltage of the output-stage circuit of LED drive circuit is excessive, stopped exporting direct current to realize overcurrent or overvoltage protection according to control switch module 102 by main control module 102, thus improve the functional reliability of constant current driving governor, and be conducive to the useful life extending LED, the system bulk solved existing for prior art is large, low and the problem that can make shorten the useful life of LED of reliability.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a constant current driving governor, be connected with the input stage current rectifying and wave filtering circuit in LED drive circuit and output-stage circuit, described input stage current rectifying and wave filtering circuit exports direct current to described constant current driving governor after doing rectifying and wave-filtering process to alternating current, the DC powered LED load work that described output-stage circuit exports according to described constant current driving governor; It is characterized in that, described constant current driving governor comprises:
Oscillator module, main control module, switch module, output electric current measure module, peak current detection module and overvoltage detection module;
The output of described oscillator module is connected with the clock signal terminal of the input of described main control module and described output electric current measure module, the output of described main control module connects the controlled end of described switch module, input and the output of described switch module are connected the output of described input stage current rectifying and wave filtering circuit and the input of described output-stage circuit respectively, test side and the output of described output electric current measure module are connected the output of described switch module and the current detection feedback end of described main control module respectively, test side and the output of described peak current detection module are connected the sample rate current end of described switch module and the peakvalue's checking feedback end of described main control module respectively, test side and the output of described overvoltage detection module are connected the output voltage sampling end of described output-stage circuit and the overvoltage detection feedback end of described main control module respectively,
Described oscillator module provides square-wave signal for described main control module and described output electric current measure module;
The described output electric current measure module pair output voltage corresponding with the output current of described switch module detects, and correspondingly output electric current measure feedback signal to described main control module; Described main control module controls described switch module according to described current sense feedback signal and adjusts output current according to pre-set current value;
Described peak current detection module detects the crest voltage corresponding to the peak current flowing through described switch module, and correspondingly exports peakvalue's checking feedback signal to described main control module; When described crest voltage is greater than crest voltage threshold value, described main control module controls described switch module according to described peakvalue's checking feedback signal to be stopped exporting direct current;
The output voltage of described overvoltage detection module to described output-stage circuit detects, and correspondingly output overvoltage detection signal to described main control module; When the output voltage of described output-stage circuit is greater than overvoltage threshold, described main control module controls described switch module according to described overvoltage detection signal to be stopped exporting direct current.
2. constant current driving governor as claimed in claim 1, it is characterized in that, described main control module comprises:
First not gate, delay circuit, the second not gate, first and door, second and door, the 3rd not gate, the first NOR gate, the 4th not gate, the first NAND gate, the second NOR gate, the 3rd with door and the 4th and door;
The common contact of the input of described first not gate and the input of described 4th not gate is the input of described main control module, the output of described first not gate connect simultaneously described delay circuit input and described first with the first input end of door, input and the output of described second not gate be connected respectively described delay circuit output and described first with the second input of door, described second is the current detection feedback end of described main control module with the first input end of door, described second to be connected with the second input of door described first with the output of door, described second is connected the input of described 3rd not gate and the first input end of described first NOR gate with the output of door simultaneously, the output of described 3rd not gate connects the first input end of the described 3rd and door, the output of described 4th not gate connects the first input end of described first NAND gate, second input of described first NAND gate is the peakvalue's checking feedback end of described main control module, first input end and second input of described second NOR gate are connected the output of described first NOR gate and the output of described first NAND gate respectively, the output of described second NOR gate and the second input of described first NOR gate are connected to the second input of the described 3rd and door altogether, described 4th overvoltage being respectively described main control module with the first input end of door and output detects feedback end and output, described 4th to be connected with the second input of door the described 3rd with the output of door.
3. constant current driving governor as claimed in claim 1, it is characterized in that, described switch module comprises:
First NMOS tube, the second NMOS tube and the first resistance;
The common contact of the grid of described first NMOS tube and the grid of described second NMOS tube is the controlled end of described switch module, the common contact of the drain electrode of described first NMOS tube and the drain electrode of described second NMOS tube is the input of described switch module, the source electrode of described first NMOS tube is the output of described switch module, the common contact of the source electrode of described second NMOS tube and the first end of described first resistance is the sample rate current end of described switch module, the second termination equipotential ground of described first resistance.
4. constant current driving governor as claimed in claim 1, it is characterized in that, output electric current measure module comprises:
First reference voltage source, the first comparator and d type flip flop;
The output of described first reference voltage source connects the inverting input of described first comparator, the in-phase input end of described first comparator is the test side of described output electric current measure module, the output of described first comparator connects the input of described d type flip flop, the clock end of described d type flip flop is the clock signal terminal of described output electric current measure module, the in-phase output end sky of described d type flip flop connects, and the reversed-phase output of described d type flip flop is the output of described output electric current measure module.
5. constant current driving governor as claimed in claim 1, it is characterized in that, described peak current detection module comprises the second reference voltage source and the second comparator, the output of described second reference voltage source connects the in-phase input end of described second comparator, and the inverting input of described second comparator and output are respectively test side and the output of described peak current detection module.
6. constant current driving governor as claimed in claim 1, it is characterized in that, described overvoltage detection module comprises:
3rd reference voltage source, the 3rd comparator, the first electric capacity, the 5th not gate and the 6th not gate;
The output of described 3rd reference voltage source connects the in-phase input end of described 3rd comparator, the inverting input of described 3rd comparator is the test side of described overvoltage detection module, the output of described 3rd comparator and the first end of described first electric capacity are connected to the input of described 5th not gate altogether, second termination equipotential ground of described first electric capacity, the output of described 5th not gate connects the input of described 6th not gate, and the output of described 6th not gate is the output of described overvoltage detection module.
7. a LED drive circuit, comprises input stage current rectifying and wave filtering circuit and output-stage circuit, it is characterized in that, described LED drive circuit also comprises the constant current driving governor as described in any one of claim 1 to 6.
8. LED drive circuit as claimed in claim 7, it is characterized in that, described input stage current rectifying and wave filtering circuit comprises rectifier bridge and the second electric capacity, the first input end of described rectifier bridge and the second input incoming transport electricity, the common contact of the output of described rectifier bridge and the first end of described second electric capacity is the output of described input stage current rectifying and wave filtering circuit, and the earth terminal of described rectifier bridge and the second end of described second electric capacity are connected to ground altogether.
9. LED drive circuit as claimed in claim 7, it is characterized in that, described output-stage circuit comprises:
Diode, the second resistance, the 3rd electric capacity, the 3rd resistance, the 4th resistance, inductance and the 4th electric capacity;
The first end of the negative electrode of described diode and the first end of described second resistance and described 3rd electric capacity connects the input that formed common contact is described output-stage circuit altogether, second end of described second resistance and the second end of described 3rd electric capacity, the described first end of the 3rd resistance and the first end of described inductance are connected to equipotential ground altogether, the common contact of the second end of described 3rd resistance and the first end of described 4th resistance is the output voltage sampling end of described output-stage circuit, the common contact of the first end of described second end of the 4th resistance and the second end of described inductance and described 4th electric capacity is the output of described output-stage circuit, and connect the input of LED load, the anode of described diode and described second end of the 4th electric capacity and the output of described LED load are connected to ground altogether.
10. a LED light emission device, comprises LED load, it is characterized in that, described LED light emission device also comprises the LED drive circuit as described in any one of claim 7 to 9.
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| CN105430796A (en) * | 2015-12-11 | 2016-03-23 | 成都翰道科技有限公司 | Intelligent LED lamp energy saving control system based on two-stage filtering signal amplification circuit |
| CN105376891A (en) * | 2015-12-11 | 2016-03-02 | 成都翰道科技有限公司 | Multifunctional LED lamp intelligent control system |
| CN105357843A (en) * | 2015-12-11 | 2016-02-24 | 成都翰道科技有限公司 | Intelligent LED lamp energy-saving control system based on constant-current rectification filter circuit |
| CN107529242B (en) * | 2016-06-22 | 2019-06-21 | 华润矽威科技（上海）有限公司 | A kind of LED drive circuit and method of equalization efficiency and power factor |
| CN107529241B (en) * | 2016-06-22 | 2019-06-21 | 华润矽威科技（上海）有限公司 | A kind of linear Constant-power LED drive circuit of single hop and method |
| JP6793330B2 (en) * | 2016-07-29 | 2020-12-02 | パナソニックＩｐマネジメント株式会社 | Signal transmitter and lighting system |
| CN107172755B (en) * | 2017-06-27 | 2019-04-16 | 深圳创维－Rgb电子有限公司 | A kind of LED light bar network current foldback circuit, driving power and television set |
| CN113842200A (en) * | 2020-11-30 | 2021-12-28 | 杭州德诺电生理医疗科技有限公司 | Pulse ablation instrument and control method thereof |
| CN114765913B (en) * | 2020-12-31 | 2023-04-18 | 华润微集成电路(无锡)有限公司 | Switch buck type LED constant current controller, control system and control method |
| CN112996192A (en) * | 2021-02-24 | 2021-06-18 | 上海穆萨电子科技有限公司 | LED drive circuit |
| CN114390756A (en) * | 2022-01-10 | 2022-04-22 | 安徽极光照明工程有限公司 | Intelligent driving controller for LED illuminating lamp |
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