CN103889124A - LED light-emitting device, LED driving circuit and constant-current driving controller of LED driving circuit - Google Patents
LED light-emitting device, LED driving circuit and constant-current driving controller of LED driving circuit Download PDFInfo
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- CN103889124A CN103889124A CN201410121142.3A CN201410121142A CN103889124A CN 103889124 A CN103889124 A CN 103889124A CN 201410121142 A CN201410121142 A CN 201410121142A CN 103889124 A CN103889124 A CN 103889124A
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Abstract
The invention belongs to the technical field of LED driving and provides an LED light-emitting device, an LED driving circuit and a constant-current driving controller of the LED driving circuit. The constant-current driving controller which comprises an oscillator module, a main control module, a switch module, an output current detecting module, a peak current detecting module and an overvoltage detecting module is used in the LED driving circuit. The circuit is simple in structure and small in size. The output current detecting module detects output currents of the switch module, the main control module controls the switch module to adjust output currents according to preset current values and according to detecting results, so that the purpose of constant current output is achieved, when the peak current detecting module detects the fact that the peak currents of the switch module are too large or the overvoltage detecting module detects the fact that the output voltages of an output stage circuit of the LED driving circuit are too large, the main control module controls the switch module to stop outputting direct currents, so that overcurrent or overvoltage protection is achieved, driving reliability is improved, and the service life of an LED can be well prolonged.
Description
Technical field
The invention belongs to LED Driving technique field, relate in particular to a kind of LED light-emitting device, LED drive circuit and constant current driving governor thereof.
Background technology
At present, because LED lighting source has the advantages such as environmental protection, energy-conservation, the life-span is long, it has been regarded as 21st century lighting source most with prospects.In recent years, along with the development of LED lighting technology, LED lighting source has started progressively to replace conventional light source and has been widely used in various lightings, and this also makes user more and more higher to the requirement of LED lighting source, wherein, the most outstanding demand is pursued frivolous exactly, and it requires circuit miniaturization and flattening, and under many circumstances, most existing Switching Power Supplies 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 by adopting the comparatively simple capacitance-resistance voltage reduction circuit of structure to replace conventional Switching Power Supply to reach the object that reduces circuit volume in LED drive circuit.Can realize circuit miniaturization although adopt capacitance-resistance voltage reduction circuit; but can cause LED drive circuit cannot 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 the existing system bulk of prior art is large, reliability is low and can make the problem shortening the useful life of LED.
The present invention realizes like this, a kind of constant current driving governor, be connected with input stage current rectifying and wave filtering circuit and output-stage circuit in LED drive circuit, described input stage current rectifying and wave filtering circuit is done after rectifying and wave-filtering is processed to export direct current to described constant current driving governor to alternating current, and described output-stage circuit is according to the DC powered LED loaded work piece of described constant current driving governor output; 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, the input of described switch module is connected respectively the output of described input stage current rectifying and wave filtering circuit and the input of described output-stage circuit with output, the test side of described output electric current measure module is connected respectively the output of described switch module and the current detecting feedback end of described main control module with output, the test side of described peak current detection module is connected respectively the sample rate current end of described switch module with output and the peak value of described main control module detects feedback end, the test side of described overvoltage detection module is connected respectively the output voltage sampling end of described output-stage circuit with output and the overvoltage of described main control module detects feedback end,
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 is adjusted output current according to switch module described in the control of described current detecting feedback signal according to predetermined current value;
Described peak current detection module detects the corresponding crest voltage of peak current that flows through described switch module, and correspondingly exports peak value and detect feedback signal to described main control module; In the time that described crest voltage is greater than crest voltage threshold value, described main control module stops exporting direct current according to switch module described in the control of described peak value detection feedback signal;
Described overvoltage detection module detects the output voltage of described output-stage circuit, and correspondingly output overvoltage detection signal to described main control module; In the time that the output voltage of described output-stage circuit is greater than overvoltage threshold, described main control module stops exporting direct current according to switch module described in the control of described overvoltage detection signal.
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-emitting device, and it comprises LED load, and also comprises above-mentioned LED drive circuit.
The present invention adopts the constant current driving governor that comprises 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, by output electric current measure module, the output current of switch module is detected, and adjust output current to reach the object of constant current output according to testing result control switch module according to predetermined current value by main control module, peak current detection module detects the peak current that flows through switch module in each switch periods of switch module, the output voltage of the output-stage circuit of overvoltage detection module to LED drive circuit detects, in the time that peak current detection module detects that the excessive or overvoltage detection module of the peak current of switch module detects that the output voltage of output-stage circuit of LED drive circuit is excessive, stop exporting direct current to realize overcurrent or overvoltage protection by main control module according to control switch module, thereby promote the functional reliability of constant current driving governor, and be conducive to extend the useful life of LED, solve the existing system bulk of prior art large, reliability is low and can make the problem shortening the useful life of LED.
Accompanying drawing explanation
Fig. 1 is the modular structure figure of the constant current driving governor that provides of the embodiment of the present invention;
Fig. 2 is the exemplary circuit structure chart of the constant current driving governor that provides of the embodiment of the present invention;
Fig. 3 is the structural representation of the LED drive circuit that provides of the embodiment of the present invention;
Fig. 4 is the exemplary circuit structure chart of the LED drive circuit that provides of the embodiment of the present invention.
Embodiment
In order to make object 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 shows the modular structure of the constant current driving governor that the embodiment of the present invention provides, and for convenience of explanation, only shows the part relevant to the embodiment of the present invention, and details are as follows:
Constant current driving governor 100 is connected with input stage current rectifying and wave filtering circuit 200 and output-stage circuit 300 in LED drive circuit, input stage current rectifying and wave filtering circuit 200 is done after rectifying and wave-filtering is processed to export direct current to constant current driving governor 100 to alternating current AC, and the DC powered LED load 400 that output-stage circuit is exported according to constant current driving governor 100 is worked.
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 input of main control module 102 and the clock signal terminal of output electric current measure module 104, the controlled end of the output connecting valve module 103 of main control module 102, the input of switch module 103 is connected respectively the output of input stage current rectifying and wave filtering circuit 200 and the input of output-stage circuit 300 with output, the output of the test side of output electric current measure module 104 and output difference connecting valve module 103 and the current detecting feedback end of main control module 102, the test side of peak current detection module 105 and output be the sample rate current end of connecting valve module 103 and the peak value of main control module 102 detection feedback end respectively, the test side of overvoltage detection module 106 is connected respectively the output voltage sampling end of output-stage circuit 300 with output and the overvoltage of main control module 102 detects feedback end.
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 is adjusted output current according to this current detecting feedback signal control switch module 103 according to predetermined current value.
Peak current detection module 105 detects the corresponding crest voltage of peak current that flows through switch module 103, and correspondingly exports peak value and detect feedback signal to main control module 102; In the time that above-mentioned crest voltage is greater than crest voltage threshold value, main control module 102 detects feedback signal control switch module 103 according to this peak value and stops exporting direct current.
Fig. 2 shows the exemplary circuit structure of the constant current driving governor 100 shown in Fig. 1, for convenience of explanation, only shows the part relevant to the embodiment of the present invention, and details are as follows:
The first not gate U1, delay circuit 1021, the second not gate U2, first and door U3, second with 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 with a U11;
The common contact of the input of the input of the first not gate U1 and the 4th not gate U7 is the input of main control module 102, the output of the first not gate U1 connect simultaneously delay circuit 1021 input and first and door U3 first input end 1, the input of the second not gate U2 and output are connected respectively the output and first and the second input 2 of door U3 of delay circuit 1021, second with door U4 first input end 1 be the current detecting feedback end of main control module 102, second with door U4 the second input 2 be connected first with door U3 output 3, 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 connection the 3rd of the 3rd not gate U5 and the first input end 1 of door U10, the output of the 4th not gate U7 connects the first input end 1 of the first NAND gate U8, the second input 2 of the first NAND gate U8 is that the peak value of main control module 102 detects feedback end, the first input end 1 of the second NOR gate U9 is connected respectively the output 3 of the first NOR gate U6 and the output 3 of the first NAND gate U8 with the second input 2, the second input 2 of the output 3 of the second NOR gate U9 and the first NOR gate U6 be connected to altogether the 3rd with door U10 the second input 2, the 4th overvoltage that is respectively main control module 102 with the door first input end 1 of U11 and output 3 detects feedback end and output, the 4th with door U11 the second input 2 be connected the 3rd with door U10 output 3.Wherein, delay circuit 1021 is the conventional delay circuits that are made up of multiple not gates, and it is for carrying out delay process to the signal of the first not gate U1 output.
The one NMOS pipe Q1, the 2nd NMOS pipe Q2 and the first resistance R 1;
The common contact of the grid of the grid of the one NMOS pipe Q1 and the 2nd NMOS pipe Q2 is the controlled end of switch module 103, the common contact of the drain electrode of the drain electrode of the one NMOS pipe Q1 and the 2nd NMOS pipe Q2 is the input of switch module 103, the source electrode of the one NMOS pipe Q1 is the output of switch module 103, the common contact of the 2nd NMOS pipe source electrode of Q2 and the first end of the first resistance R 1 is the sample rate current end of switch module 103, the second termination equipotential ground of the first resistance R 1.
Output electric current measure module 104 comprises:
The first reference voltage source 1041, the 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 reference voltage generating circuit take reference voltage source chip TL431 as core of commonly using, and it is for providing the reference voltage corresponding with above-mentioned predetermined 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 reference voltage generating circuit take reference voltage source chip TL431 as core of commonly using, and it is for providing above-mentioned crest voltage threshold value to the second comparator U14.
The 3rd reference voltage source 1061, the 3rd comparator U15, the first capacitor C 1, 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 first end of the output of the 3rd comparator U15 and the first capacitor C 1 is connected to the input of the 5th not gate U16 altogether, the second termination equipotential ground of the first capacitor C 1, 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, the 3rd reference voltage source 1061 can be specifically the reference voltage generating circuit take reference voltage source chip TL431 as core of commonly using; it is for providing a reference voltage (being 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 R 1) is less than the output voltage (being above-mentioned crest voltage threshold value) of the second reference voltage source 1051, the second comparator U14 output high level (being that above-mentioned peak value detects feedback signal) is to the first NAND gate U8, and when the output voltage of output-stage circuit 300 (being the voltage of the output voltage sampling end of output-stage circuit 300) is less than the output voltage of the 3rd reference voltage source 1061, the 3rd comparator U15 output high level, after the 5th not gate U16 and the 6th not gate U17, still export high level (being above-mentioned overvoltage detection signal) to the 4th with door a U11, now, if the voltage of the input of output-stage circuit 300 (i.e. the corresponding output voltage of output current of the source electrode of a NMOS pipe Q1) is greater than the output voltage of the first reference voltage source 1041, the first comparator U12 exports high level, the rising edge of the square-wave signal that d type flip flop U13 exports at oscillator module 101 this high level of sampling, and the first input end 1 of output low level signal to the second and door U4, and keep a cycle of oscillation, first produces the pulse signal to the second and a door U4 of duty ratio very little (be low level width much larger than high level width) in one-period with the falling edge of the square-wave signal exported at oscillator module 101 of door U3, second understands an output low level with door U4, the 3rd not gate U5 exports high level to the three and door U10 thereupon, simultaneously, the 4th not gate U7 is input as the low level in the square-wave signal that oscillator module 101 exports, 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, the output signal of the first NAND gate U8 is low level, so the rest-set flip-flop being made up of the first NOR gate U6 and the second NOR gate U9 continues to keep low level output according to known the second NOR gate U9 of its preceding state, the 3rd with a door U10 output low level, the 4th also output low level control the one NMOS pipe Q1 and the 2nd NMOS pipe Q2 continue to keep closing one-period thereupon with door U11, 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 corresponding output voltage of output current of the source electrode of a NMOS pipe Q1) is less than the output voltage of the first reference voltage source 1041, the first comparator U12 output low level, the rising edge of the square-wave signal that d type flip flop U13 exports at oscillator module 101 this low level of sampling, and export high level signal to the second with door U4 first input end 1, and keep a cycle of oscillation, first produces the pulse signal to the second and a door U4 of duty ratio very little (be low level width much larger than high level width) in one-period with the falling edge of the square-wave signal exported at oscillator module 101 of door U3, second can export the pulse signal of duty ratio very little (be low level width much larger than high level width) in one-period with door U4, the 3rd not gate U5 is the pulse signal to the three and a door U10 of output duty cycle very large (be low level width much smaller than high level width) in one-period thereupon, simultaneously, the 4th not gate U7 is input as the low level in the square-wave signal that oscillator module 101 exports, 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, the output signal of the first NAND gate U8 is low level, the rest-set flip-flop being made up of the first NOR gate U6 and the second NOR gate U9 can make the second NOR gate U9 output high level by change state, the 3rd export high level with door U10, the 4th also exports high level control the one NMOS pipe Q1 and the 2nd NMOS pipe Q2 unlatching one-period with door U11 thereupon, to increase the electric current supply of output-stage circuit 300 to LED load 400.
The output voltage of supposing the first reference voltage source 1041 is Vref, the sampling resistor of the input end of output-stage circuit 300 is Rcs, the output current of switch module 103 is that Vref/Rcs(Vref and Rcs are fixed value), as can be seen here, by output electric current measure module 104 take the output voltage of the first reference voltage source 1041 as benchmark, and according to the fluctuation of the output voltage of a NMOS pipe Q1, by main control module 102, a NMOS pipe Q1 and the 2nd NMOS pipe Q2 are carried out to above-mentioned switch control, can repeatedly adjust the output current of switch module 103, thereby the mean value that makes output current remains unchanged to realize constant current output, promote the drive efficiency to LED load 400.
In the time that the 4th is high level with the output 3 of door U11, the one NMOS pipe Q1 and the 2nd NMOS pipe Q2 conducting, between the one NMOS pipe Q1 and the 2nd NMOS pipe Q2, there is certain mirror image proportionate relationship, along with the increase of ON time, the electric current that flows through the first resistance R 1 can increase gradually, the voltage in the first resistance R 1 also increases gradually, in the time that this voltage is greater than the output voltage of the second reference voltage source 1051, the second comparator U14 meeting output low level (being that above-mentioned peak value detects feedback signal) is to the first NAND gate U8, the first NAND gate U8 exports high level thereupon, the second NOR gate U9 output low level, the 3rd with a door U10 also output low level, so the 4th turn-offs with door U11 output low level control the one NMOS pipe Q1 and the 2nd NMOS pipe Q2, thereby in the time that the output current peak value of switch module 13 is excessive, LED load 400 is realized to overcurrent protection.
In the time that the output voltage of output-stage circuit 300 is greater than the output voltage of the 3rd reference voltage source 1061; the 3rd comparator U15 meeting output low level; the 5th not gate U16 output high level; the 6th not gate U17 output low level (being above-mentioned overvoltage detection signal) to the 4th with door a U11; the 4th with door U11 thereupon output low level control the one NMOS pipe Q1 and the 2nd NMOS pipe Q2 turn-off, thereby in the time that the output voltage of output-stage circuit 300 is excessive, LED load 400 is realized to overvoltage protection.
The realization of the constant current driving governor 100 based on above-mentioned, the embodiment of the present invention also 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 capacitor C 2, 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 capacitor C 2 is the output of input stage current rectifying and wave filtering circuit 200, and the second end of the earth terminal 4 of rectifier bridge BD and the second capacitor C 2 is connected to ground altogether.
Output-stage circuit 300 comprises:
Diode D1, the second resistance R 2, the 3rd capacitor C 3, the 3rd resistance R 3, the 4th resistance R 4, inductance L 1 and the 4th capacitor C 4;
It is the input of output-stage circuit 300 that the first end of the first end of the negative electrode of diode D1 and the second resistance R 2 and the 3rd capacitor C 3 connects formed common contact altogether, the second end of the second end of the second resistance R 2 and the 3rd capacitor C 3, the first end of the first end of the 3rd resistance R 3 and inductance L 1 is connected to equipotential ground altogether, the common contact of the second end of the 3rd resistance R 3 and the first end of the 4th resistance R 4 is the output voltage sampling end of output-stage circuit 300, the common contact of the first end of the second end of the 4th resistance R 4 and the second end of inductance L 1 and the 4th capacitor C 4 is the output of output-stage circuit 300, and connect the input of LED load 400, the second end of the anode of diode D1 and the 4th capacitor C 4 and the output of LED load 400 are connected to ground altogether.Wherein, the second resistance R 2 is just equivalent to the sampling resistor Rcs of the input end of output-stage circuit related in the operation principle of above-mentioned constant current driving governor 100 300.
The embodiment of the present invention also provides a kind of LED light-emitting 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 that 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 in LED drive circuit, its circuit structure is simple, and volume is little; by output electric current measure module 104, the output current of switch module 103 is detected, and adjust output current to reach the object of constant current output according to testing result control switch module according to predetermined current value by main control module, peak current detection module 105 detects the peak current that flows 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 to LED drive circuit detects, in the time that peak current detection module 105 detects that the excessive or overvoltage detection module 106 of the output current peak value of switch module 103 detects that the output voltage of output-stage circuit of LED drive circuit is excessive, stop exporting direct current to realize overcurrent or overvoltage protection by main control module 102 according to control switch module 102, thereby promote the functional reliability of constant current driving governor, and be conducive to extend the useful life of LED, solve the existing system bulk of prior art large, reliability is low and can make the problem shortening the useful life of LED.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a constant current driving governor, be connected with input stage current rectifying and wave filtering circuit and output-stage circuit in LED drive circuit, described input stage current rectifying and wave filtering circuit is done after rectifying and wave-filtering is processed to export direct current to described constant current driving governor to alternating current, and described output-stage circuit is according to the DC powered LED loaded work piece of described constant current driving governor output; 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, the input of described switch module is connected respectively the output of described input stage current rectifying and wave filtering circuit and the input of described output-stage circuit with output, the test side of described output electric current measure module is connected respectively the output of described switch module and the current detecting feedback end of described main control module with output, the test side of described peak current detection module is connected respectively the sample rate current end of described switch module with output and the peak value of described main control module detects feedback end, the test side of described overvoltage detection module is connected respectively the output voltage sampling end of described output-stage circuit with output and the overvoltage of described main control module detects feedback end,
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 is adjusted output current according to switch module described in the control of described current detecting feedback signal according to predetermined current value;
Described peak current detection module detects the corresponding crest voltage of peak current that flows through described switch module, and correspondingly exports peak value and detect feedback signal to described main control module; In the time that described crest voltage is greater than crest voltage threshold value, described main control module stops exporting direct current according to switch module described in the control of described peak value detection feedback signal;
Described overvoltage detection module detects the output voltage of described output-stage circuit, and correspondingly output overvoltage detection signal to described main control module; In the time that the output voltage of described output-stage circuit is greater than overvoltage threshold, described main control module stops exporting direct current according to switch module described in the control of described overvoltage detection signal.
2. constant current driving governor as claimed in claim 1, is characterized in that, described main control module comprises:
The first not gate, delay circuit, the second not gate, first and door, second with 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;
The input that the common contact of the input of the input of described the first not gate and described the 4th not gate is described main control module, the output of described the first not gate connect simultaneously described delay circuit input and described first with door first input end, the input of described the second not gate and output be connected respectively described delay circuit output and described first with the second input of door, described second with the first input end of the door current detecting feedback end that is described main control module, described second with door the second input be connected described first with door output, described second is connected the input of described the 3rd not gate and the first input end of described the first NOR gate with the output of door simultaneously, the output of described the 3rd not gate connect the described the 3rd with door first input end, the output of described the 4th not gate connects the first input end of described the first NAND gate, the peak value that the second input of described the first NAND gate is described main control module detects feedback end, the first input end of described the second NOR gate is connected respectively the output of described the first NOR gate and the output of described the first NAND gate with the second input, the second input of the output of described the second NOR gate and described the first NOR gate be connected to altogether the described the 3rd with door the second input, the described the 4th overvoltage that is respectively described main control module with the first input end of door and output detects feedback end and output, the described the 4th with door the second input be connected the described the 3rd with door output.
3. constant current driving governor as claimed in claim 1, is characterized in that, described switch module comprises:
The one NMOS pipe, the 2nd NMOS pipe and the first resistance;
The controlled end that the common contact of the grid of the grid of a described NMOS pipe and described the 2nd NMOS pipe is described switch module, the input that the common contact of the drain electrode of the drain electrode of a described NMOS pipe and described the 2nd NMOS pipe is described switch module, the source electrode of a described NMOS pipe is the output of described switch module, the sample rate current end that the common contact of the first end of the source electrode of described the 2nd NMOS pipe and described the first resistance is described switch module, the second termination equipotential ground of described the first resistance.
4. constant current driving governor as claimed in claim 1, is characterized in that, output electric current measure module comprises:
The first reference voltage source, the first comparator and d type flip flop;
The output of described the first reference voltage source connects the inverting input of described the first comparator, the in-phase input end of described the first comparator is the test side of described output electric current measure module, the output of described the 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 the second reference voltage source connects the in-phase input end of described the second comparator, and the inverting input of described the 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, is characterized in that, described overvoltage detection module comprises:
The 3rd reference voltage source, the 3rd comparator, the first electric capacity, the 5th not gate and the 6th not gate;
The output of described the 3rd reference voltage source connects the in-phase input end of described the 3rd comparator, the inverting input of described the 3rd comparator is the test side of described overvoltage detection module, the first end of the output of described the 3rd comparator and described the first electric capacity is connected to the input of described the 5th not gate altogether, the second termination equipotential ground of described the first electric capacity, the output of described the 5th not gate connects the input of described the 6th not gate, and the output of described the 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 claim 1 to 6 any one.
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 first end of the output of described rectifier bridge and described the second electric capacity is the output of described input stage current rectifying and wave filtering circuit, and the second end of the earth terminal of described rectifier bridge and described the second electric capacity is connected to ground altogether.
9. LED drive circuit as claimed in claim 7, 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 first end of the negative electrode of described diode and described the second resistance and described the 3rd electric capacity connects the input that formed common contact is described output-stage circuit altogether, the second end of the second end of described the second resistance and described the 3rd electric capacity, described the 3rd first end of resistance and the first end of described inductance are connected to equipotential ground altogether, the output voltage sampling end that the common contact of the second end of described the 3rd resistance and the first end of described the 4th resistance is described output-stage circuit, the output that the common contact of the first end of the second end of described the 4th resistance and the second end of described inductance and described the 4th electric capacity is described output-stage circuit, and connect the input of LED load, the second end of the anode of described diode and described the 4th electric capacity and the output of described LED load are connected to ground altogether.
10. a LED light-emitting device, comprises LED load, it is characterized in that, described LED light-emitting device also comprises the LED drive circuit as described in claim 7 to 9 any one.
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