CN104181426A - LED light source load detection circuit for electronic ballast - Google Patents
LED light source load detection circuit for electronic ballast Download PDFInfo
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Abstract
The invention relates to the technical field of LEDs, in particular to an LED light source load detection circuit for an electronic ballast. The LED light source load detection circuit for the electronic ballast comprises the electronic ballast, a secondary rectification and filtering module, an LED lighting module, an LED current control module and an LED current detection indication module, wherein the secondary rectification and filtering module is used for converting alternating-current voltage output by the electronic ballast into direct-current voltage, the LED lighting module is used for providing a LED light source load, the LED current control module is used for converting current output by the LED lighting module into voltage and amplifying the voltage, the LED current detection indication module is used for displaying an LED light source load current detection result, and the electronic ballast, the secondary rectification and filtering module, the LED lighting module, the LED current control module and the LED current detection indication module are connected in sequence. A household circuit does not need to be modified, when an original electronic ballast circuit is not modified, the detection circuit can detect the magnitude of output current of a needed LED lamp lighting product when an energy saving lamp to be replaced is replaced by the LED light source load, and can also detect the magnitudes of current of LED lamp lighting products needed for replacing electronic ballasts of different models.
Description
Technical field
The present invention relates to LED technical field, relate in particular to a kind of LED light source load detecting circuit of electric ballast.
Background technology
Along with the increasingly mature of LED application technology and in the widespread use of lighting field, the demand of LED illumination market also day by day expands thereupon, LED relies on its high light efficiency, high life, energy-conservation, environmental protection and the controllability many advantages such as well replace tungsten lamp and the electricity-saving lamp that traditional lighting uses and have become historical inevitability, the application of traditional energy-saving lamp be unable to do without electric ballast, if must original house decoration circuit be transformed so common LED bulb lamp need to replace electricity-saving lamp, too high being not easy of improvement cost realized like this.
Summary of the invention
The invention provides a kind of LED light source load detecting circuit of electric ballast, to solve existing LED light source load, replace energy-conservation grade to carry out the problem that improvement cost is high to household lines.
A LED light source load detecting circuit for electric ballast, comprising:
Electric ballast, for the alternating voltage of electric ballast output being converted into the secondary rectification filtering module of DC voltage, for the LED lighting module of LED light source load is provided, for LED lighting module output current being converted to voltage the LED current control module of amplifying, for showing the LED current detecting indicating module of LED light source load current detection result;
Wherein, described electric ballast, secondary rectification filtering module, LED lighting module, LED current control module and LED current detecting indicating module connect successively.
Preferably, also comprise that described auxiliary VCC voltage and reference voltage module are connected with secondary rectification filtering module and LED lighting module respectively for auxiliary VCC voltage and the reference voltage module in voltage reference voltage source are provided.
Preferably, described secondary rectification filtering module comprises:
Fuse F1, inductance L 1, commutation diode D5-D8, resistance R 30-R31, wherein, one end of fuse F1 is connected with the voltage output end VC1 of electric ballast, the other end of fuse F1 is connected with one end of resistance R 30, the other end of resistance R 30 is connected with one end of inductance L 1, the other end of inductance L 1 respectively with the negative electrode of commutation diode D5, the anodic bonding of commutation diode D8, the anode of commutation diode D5 is connected with anode and the ground of commutation diode D7 respectively, the negative electrode of commutation diode D8 is connected with negative electrode and the LED lighting module of commutation diode D6 respectively, the anode of commutation diode D6 is connected with the negative electrode of commutation diode D7 and one end of resistance R 31 respectively, the other end of resistance R 31 is connected with the voltage output end VC2 of electric ballast.
Preferably, described LED current control module comprises:
Resistance R 1-R6, capacitor C 1-C2, amplifier U1A, wherein, one end of described resistance R 1 respectively with LED lighting module, one end of one end of resistance R 2 and resistance R 3 connects, the other end of resistance R 1 respectively with the other end of resistance R 2, one end of ground and resistance R 4 connects, the other end of resistance R 3 respectively with the electrode input end of amplifier U1A, one end of resistance R 5, one end of capacitor C 1 connects, the other end of resistance R 4 respectively with one end of capacitor C 2, one end of the negative input of amplifier U1A and resistance R 6 connects, the other end of capacitor C 1, the other end of resistance R 5, the other end of capacitor C 2 is all connected with ground, the output terminal of the other end of resistance R 6 and amplifier U1A is connected with the input end of LED current detecting indicating module respectively.
Preferably, described LED current detecting indicating module comprises:
Resistance R 7-R19, resistance R 32, capacitor C 3, capacitor C 5-C6, amplifier U1B, amplifier U1C, amplifier U1D, triode Q2, commutation diode D3-D4, LED LED-G, LED LED-R, LED LED-B, wherein, one end of described resistance R 18 is connected with LED current control module, the other end of resistance R 18 respectively with the positive pole of capacitor C 3, positive polarity output terminal VOUT+, the electrode input end of one end of resistance R 32 and amplifier U1B connects, the negative input of amplifier U1B respectively with one end of resistance R 8, one end of resistance R 7 connects, the other end of resistance R 7 is connected with 2.5V reference voltage Vref 2.5V, the anodic bonding of the output terminal of amplifier U1B and LED LED-G, the negative electrode of LED LED-G is connected with one end of resistance R 9, the other end of resistance R 9 is connected with the emitter of triode Q2, the base stage of triode Q2 respectively with one end of resistance R 16, one end of resistance R 19, one end of resistance R 15 connects, the other end of resistance R 16, the collector of triode Q2, the other end of resistance R 8, the other end of resistance R 32, the negative pole of capacitor C 3 is all connected with ground, the other end of resistance R 15 is connected with the negative electrode of commutation diode D3, the anode of commutation diode D3 respectively with the anode of LED LED-B, the output terminal of amplifier U1C connects, the negative electrode of LED LED-B is connected with one end of resistance R 12, the negative input of amplifier U1C respectively with one end of resistance R 10, one end of resistance R 11 connects, the other end of resistance R 10 is connected with 2.5V reference voltage Vref 2.5V, the electrode input end of amplifier U1C is connected with one end of positive polarity output terminal VOUT+ and capacitor C 5 respectively, the other end of capacitor C 5, the other end of resistance R 11, the other end of resistance R 12 is all connected with ground, the other end of resistance R 19 is connected with the negative electrode of commutation diode D4, the anode of commutation diode D4 respectively with the output terminal of amplifier U1D, the anodic bonding of LED LED-R, the negative electrode of LED LED-R is connected with one end of resistance R 17, the negative input of amplifier U1D is connected with one end of positive polarity output terminal VOUT+ and capacitor C 6 respectively, the electrode input end of amplifier U1D respectively with one end of resistance R 13, one end of resistance R 14 connects, the other end of resistance R 13 is connected with 2.5V reference voltage Vref 2.5V, the other end of resistance R 17, the other end of resistance R 14, the other end of capacitor C 6 is all connected with ground.
Preferably, described auxiliary VCC voltage and reference voltage module comprise:
Resistance R 22-R25, capacitor C 7-C9, commutation diode D1-D2, triode Q1, voltage stabilizing diode ZD1, controllable accurate source of stable pressure U2, wherein, the anode of commutation diode D1 is connected with output terminal and the LED lighting module of secondary rectification filtering module respectively, the negative electrode of commutation diode D1 is connected with one end of resistance R 22 and one end of resistance R 23 respectively, the other end of resistance R 22 respectively with the positive pole of capacitor C 7, the other end of resistance R 23, the collector of one end of resistance R 24 and triode Q1 connects, the other end of resistance R 24 is connected with the base stage of triode Q1 and the negative electrode of voltage stabilizing diode ZD1 respectively, the anodic bonding of the emitter of triode Q1 and commutation diode D2, the negative electrode of commutation diode D2 respectively with the positive pole of capacitor C 8, one end of power supply VCC and resistance R 25 connects, the other end of resistance R 25 respectively with the negative electrode of controllable accurate source of stable pressure U2, the reference utmost point of controllable accurate source of stable pressure U2, one end of 2.5V reference voltage Vref 2.5V and capacitor C 9 connects, the negative pole of capacitor C 7, the anode of voltage stabilizing diode ZD1, the negative pole of capacitor C 8, the anode of controllable accurate source of stable pressure U2, the other end of capacitor C 9 is all connected with ground.
The LED light source load detecting circuit of electric ballast of the present invention, comprises electric ballast, for the alternating voltage of electric ballast output being converted into the secondary rectification filtering module of DC voltage, for the LED lighting module of LED light source load is provided, for LED lighting module output current being converted to voltage the LED current control module of amplifying, for showing the LED current detecting indicating module of LED light source load current detection result; Wherein, described electric ballast, secondary rectification filtering module, LED lighting module, LED current control module and LED current detecting indicating module connect successively.By the output voltage of electric ballast being carried out to the load of AC-DC conversion access LED light source, utilize LED current control module to the current conversion of LED light source load for voltage and amplify, finally at LED current detecting indicating module, show the testing result of the voltage of this electric ballast, thereby realize electric ballast and the LED light source load pairing of different model, need not transform home circuit, when original electronic ballast circuit is not transformed, use testing circuit of the present invention can detect will be alternative electricity-saving lamp with LED light source load, replace, the LED lamp illuminating product that needs great output current, the electric ballast that detects different model needs much electric current LED lamp illuminating products to replace, greatly facilitate existing tube with electronic ballast electricity-saving lamp to replace to LED lamp illuminating product workload, greatly reduce required every cost, the electric ballast of different model is joined the LED lamp illuminating product of different output current, the high light efficiency of larger performance LED lamp illuminating product, energy-conservation, environmental protection, long-life advantage.
Accompanying drawing explanation
Fig. 1 is the frame principle figure one of the LED light source load detecting circuit of the electric ballast that provides of the embodiment of the present invention.
Fig. 2 is the circuit frame principle figure of the electric ballast that provides of the embodiment of the present invention.
Fig. 3 is the frame principle figure two of the LED light source load detecting circuit of the electric ballast that provides of the embodiment of the present invention.
Fig. 4 is the secondary rectification filtering module circuit diagram that the embodiment of the present invention provides.
Fig. 5 is the LED current control module circuit diagram that the embodiment of the present invention provides.
Fig. 6 is the LED current detecting indicating module circuit diagram that the embodiment of the present invention provides.
Fig. 7 is auxiliary VCC voltage and the reference voltage module circuit diagram that the embodiment of the present invention provides.
Fig. 8 shows the LED light source load detecting circuit figure of the electric ballast that the embodiment of the present invention provides.
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 frame principle figure of the LED light source load detecting circuit of a kind of electric ballast that the embodiment of the present invention provides, and a kind of LED light source load detecting circuit of electric ballast, comprising:
Electric ballast, for the alternating voltage of electric ballast output being converted into the secondary rectification filtering module of DC voltage, for the LED lighting module of LED light source load is provided, for LED lighting module output current being converted to voltage the LED current control module of amplifying, for showing the LED current detecting indicating module of LED light source load current detection result;
Wherein, described electric ballast, secondary rectification filtering module, LED lighting module, LED current control module and LED current detecting indicating module connect successively.
In the present embodiment, as shown in Figure 2, traditional electronic ballast circuit is divided into two kinds to the circuit frame principle figure of electric ballast, a kind of for there being power factor correction, as A part in Fig. 2, a kind of for reactive factor correction, as B part in Fig. 2.The electronic rectifier output voltage terminal that need to test model is connected with secondary rectification filtering module, the alternating voltage of electric ballast output is converted into DC voltage powers to LED lighting module, LED lighting module is LED light source load, as shown in Figure 8, LED lamp group for a plurality of parallel connections, the LED lamp pearl that each LED lamp group is a plurality of series connection, adopt both end voltage in parallel constant, be the output voltage at ballast resistor two ends, different LED lighting modules, the electric current flowing through is different, by LED current control module, the current conversion of LED lighting module is become voltage and amplified, so that LED current detecting indicating circuit detects by voltage and shows.
Fig. 3 shows the frame principle figure of the LED light source load detecting circuit of a kind of electric ballast that the embodiment of the present invention provides, the LED light source load detecting circuit of electric ballast comprises the whole modules in above-described embodiment, comprise in addition with lower module, for auxiliary VCC voltage and the reference voltage module in voltage reference voltage source are provided, described auxiliary VCC voltage and reference voltage module are connected with secondary rectification filtering module and LED lighting module respectively.In the present embodiment, auxiliary VCC voltage and reference voltage module are in order to provide reference voltage.
Fig. 4 shows the secondary rectification filtering module circuit diagram that the embodiment of the present invention provides, and comprising:
Fuse F1, inductance L 1, commutation diode D5-D8, resistance R 30-R31, wherein, one end of fuse F1 is connected with the voltage output end VC1 of electric ballast, the other end of fuse F1 is connected with one end of resistance R 30, the other end of resistance R 30 is connected with one end of inductance L 1, the other end of inductance L 1 respectively with the negative electrode of commutation diode D5, the anodic bonding of commutation diode D8, the anode of commutation diode D5 is connected with anode and the ground of commutation diode D7 respectively, the negative electrode of commutation diode D8 is connected with negative electrode and the LED lighting module of commutation diode D6 respectively, the anode of commutation diode D6 is connected with the negative electrode of commutation diode D7 and one end of resistance R 31 respectively, the other end of resistance R 31 is connected with the voltage output end VC2 of electric ballast.
In the present embodiment, the value of described inductance L 1 is 100uH, and the value of described resistance R 31 is 6.8 Ω.The model of fuse F1 is T2A/250VAC, and the model of commutation diode D5-D8 is SS2200.In this example, the self-defined output terminal of secondary rectification filtering module, the i.e. negative electrode of the negative electrode of commutation diode D8 and commutation diode D6.
Fig. 5 shows the LED current control module circuit diagram that the embodiment of the present invention provides, and comprising:
Resistance R 1-R6, capacitor C 1-C2, amplifier U1A, wherein, one end of described resistance R 1 respectively with LED lighting module, one end of one end of resistance R 2 and resistance R 3 connects, the other end of resistance R 1 respectively with the other end of resistance R 2, one end of ground and resistance R 4 connects, the other end of resistance R 3 respectively with the electrode input end of amplifier U1A, one end of resistance R 5, one end of capacitor C 1 connects, the other end of resistance R 4 respectively with one end of capacitor C 2, one end of the negative input of amplifier U1A and resistance R 6 connects, the other end of capacitor C 1, the other end of resistance R 5, the other end of capacitor C 2 is all connected with ground, the output terminal of the other end of resistance R 6 and amplifier U1A is connected with the input end of LED current detecting indicating module respectively.
In the present embodiment, the resistance of described resistance R 1-R2 is 0.51 Ω, and the resistance of resistance R 3-R4 is 10K Ω, and the resistance of resistance R 5-R6 is 240K Ω, and the value of capacitor C 1-C2 is 0.1uF, and the model of amplifier U1A is LM2902.
Fig. 6 shows the LED current detecting indicating module circuit diagram that the embodiment of the present invention provides, and comprising:
Resistance R 7-R19, resistance R 32, capacitor C 3, capacitor C 5-C6, amplifier U1B, amplifier U1C, amplifier U1D, triode Q2, commutation diode D3-D4, LED LED-G, LED LED-R, LED LED-B, wherein, one end of described resistance R 18 is connected with LED current control module, the other end of resistance R 18 respectively with the positive pole of capacitor C 3, positive polarity output terminal VOUT+, the electrode input end of one end of resistance R 32 and amplifier U1B connects, the negative input of amplifier U1B respectively with one end of resistance R 8, one end of resistance R 7 connects, the other end of resistance R 7 is connected with 2.5V reference voltage Vref 2.5V, the anodic bonding of the output terminal of amplifier U1B and LED LED-G, the negative electrode of LED LED-G is connected with one end of resistance R 9, the other end of resistance R 9 is connected with the emitter of triode Q2, the base stage of triode Q2 respectively with one end of resistance R 16, one end of resistance R 19, one end of resistance R 15 connects, the other end of resistance R 16, the collector of triode Q2, the other end of resistance R 8, the other end of resistance R 32, the negative pole of capacitor C 3 is all connected with ground, the other end of resistance R 15 is connected with the negative electrode of commutation diode D3, the anode of commutation diode D3 respectively with the anode of LED LED-B, the output terminal of amplifier U1C connects, the negative electrode of LED LED-B is connected with one end of resistance R 12, the negative input of amplifier U1C respectively with one end of resistance R 10, one end of resistance R 11 connects, the other end of resistance R 10 is connected with 2.5V reference voltage Vref 2.5V, the electrode input end of amplifier U1C is connected with one end of positive polarity output terminal VOUT+ and capacitor C 5 respectively, the other end of capacitor C 5, the other end of resistance R 11, the other end of resistance R 12 is all connected with ground, the other end of resistance R 19 is connected with the negative electrode of commutation diode D4, the anode of commutation diode D4 respectively with the output terminal of amplifier U1D, the anodic bonding of LED LED-R, the negative electrode of LED LED-R is connected with one end of resistance R 17, the negative input of amplifier U1D is connected with one end of positive polarity output terminal VOUT+ and capacitor C 6 respectively, the electrode input end of amplifier U1D respectively with one end of resistance R 13, one end of resistance R 14 connects, the other end of resistance R 13 is connected with 2.5V reference voltage Vref 2.5V, the other end of resistance R 17, the other end of resistance R 14, the other end of capacitor C 6 is all connected with ground.
In the present embodiment, described resistance R 7, resistance R 10, the resistance of resistance R 13 is 10K Ω, resistance R 9, resistance R 12, the resistance of resistance R 17 is 5.6K Ω, resistance R 15, resistance R 18, the resistance of resistance R 19 is 1K Ω, the resistance of resistance R 8 is 13K Ω, the resistance of resistance R 11 is 75K Ω, the resistance of resistance R 14 is 12K Ω, the resistance of resistance R 16 is 56K Ω, capacitor C 5, the value of capacitor C 6 is 0.1uF, the value of capacitor C 3 is 47Uf/35V, amplifier U1B, amplifier U1C, the model of amplifier U1D is LM2902, commutation diode D3, the model of D4 is 1N4148, the model of triode Q2 is MMBT2907.In this example, the self-defined input end of LED current detecting indicating module, i.e. one end of resistance R 18.LED current detecting indicating module is when the range of current that LED light source load detected is less than 360mA, LED LED-B lights, represent that electric current is bigger than normal, the range of current of LED light source load is greater than 230mA, and while being less than 350mA, LED LED-G lights, represent that electric current is suitable, can mate, the range of current of LED light source load is less than 220mA, LED LED-R lights, and represents that electric current is less than normal.When LED LED-G lights, represent that the electric ballast of this model mates with this LED lighting module, the voltage of the electric ballast of this model can provide the LED light source load of this big or small output current.
Fig. 7 shows auxiliary VCC voltage and the reference voltage module circuit diagram that the embodiment of the present invention provides, and comprising:
Resistance R 22-R25, capacitor C 7-C9, commutation diode D1-D2, triode Q1, voltage stabilizing diode ZD1, controllable accurate source of stable pressure U2, wherein, the anode of commutation diode D1 is connected with output terminal and the LED lighting module of secondary rectification filtering module respectively, the negative electrode of commutation diode D1 is connected with one end of resistance R 22 and one end of resistance R 23 respectively, the other end of resistance R 22 respectively with the positive pole of capacitor C 7, the other end of resistance R 23, the collector of one end of resistance R 24 and triode Q1 connects, the other end of resistance R 24 is connected with the base stage of triode Q1 and the negative electrode of voltage stabilizing diode ZD1 respectively, the anodic bonding of the emitter of triode Q1 and commutation diode D2, the negative electrode of commutation diode D2 respectively with the positive pole of capacitor C 8, one end of power supply VCC and resistance R 25 connects, the other end of resistance R 25 respectively with the negative electrode of controllable accurate source of stable pressure U2, the reference utmost point of controllable accurate source of stable pressure U2, one end of 2.5V reference voltage Vref 2.5V and capacitor C 9 connects, the negative pole of capacitor C 7, the anode of voltage stabilizing diode ZD1, the negative pole of capacitor C 8, the anode of controllable accurate source of stable pressure U2, the other end of capacitor C 9 is all connected with ground.
In the present embodiment, the value of described capacitor C 7 is 22uF/100V, the value of capacitor C 8 is 100uF/35V, the value of capacitor C 9 is 1uF, and the value of resistance R 22, R23 is 100 Ω, and the value of resistance R 24, resistance R 25 is 15K Ω, the model of triode Q1 is BXC56-16SOT-89, the model of commutation diode D1-D2 is U1J, and the model of controllable accurate source of stable pressure U2 is TL431, and the model of voltage stabilizing diode ZD1 is 22V/1W SMA.
Fig. 8 shows the LED light source load detecting circuit figure of the electric ballast that the embodiment of the present invention provides, and principle of work is as follows:
Secondary rectification filtering module carries out the output voltage of electric ballast to access LED light source load after AC-DC conversion filtering, utilize LED current control module to the current conversion of LED light source load for voltage and amplify, finally at LED current detecting indicating module, show the testing result of the voltage of this electric ballast, different results shows lights different LED light emitting diodes, thereby realizes electric ballast and the LED light source load pairing of different model.
The circuit of above-mentioned all modules is only an embodiment of this module, can also take other circuit to realize, be not limited to an above-mentioned embodiment, the value providing in above-mentioned all embodiment is one embodiment of the present of invention, and the value of all components and parts of the present invention is not limited to this embodiment.
The LED light source load detecting circuit of electric ballast of the present invention need not be transformed home circuit, when original electronic ballast circuit is not transformed, use testing circuit of the present invention can detect will be alternative electricity-saving lamp with LED light source load, replace, need the LED lamp illuminating product of great output current; The electric ballast that detects different model needs much electric current LED lamp illuminating products to replace, greatly facilitate existing tube with electronic ballast electricity-saving lamp to replace to LED lamp illuminating product workload, greatly reduce required every cost, the electric ballast of different model is joined the LED lamp illuminating product of different output current, the high light efficiency of larger performance LED lamp illuminating product, energy-conservation, environmental protection, long-life advantage.
Know-why of the present invention has below been described in conjunction with specific embodiments.These are described is in order to explain principle of the present invention, and can not be interpreted as by any way limiting the scope of the invention.Explanation based on herein, those skilled in the art does not need to pay performing creative labour can associate other embodiment of the present invention, within these modes all will fall into protection scope of the present invention.
Claims (6)
1. a LED light source load detecting circuit for electric ballast, is characterized in that, comprising:
Electric ballast, for the alternating voltage of electric ballast output being converted into the secondary rectification filtering module of DC voltage, for the LED lighting module of LED light source load is provided, for LED lighting module output current being converted to voltage the LED current control module of amplifying, for showing the LED current detecting indicating module of LED light source load current detection result;
Wherein, described electric ballast, secondary rectification filtering module, LED lighting module, LED current control module and LED current detecting indicating module connect successively.
2. LED light source load detecting circuit as claimed in claim 1, it is characterized in that, also comprise that described auxiliary VCC voltage and reference voltage module are connected with secondary rectification filtering module and LED lighting module respectively for auxiliary VCC voltage and the reference voltage module in voltage reference voltage source are provided.
3. LED light source load detecting circuit as claimed in claim 1 or 2, is characterized in that, described secondary rectification filtering module comprises:
Fuse F1, inductance L 1, commutation diode D5-D8, resistance R 30-R31, wherein, one end of fuse F1 is connected with the voltage output end VC1 of electric ballast, the other end of fuse F1 is connected with one end of resistance R 30, the other end of resistance R 30 is connected with one end of inductance L 1, the other end of inductance L 1 respectively with the negative electrode of commutation diode D5, the anodic bonding of commutation diode D8, the anode of commutation diode D5 is connected with anode and the ground of commutation diode D7 respectively, the negative electrode of commutation diode D8 is connected with negative electrode and the LED lighting module of commutation diode D6 respectively, the anode of commutation diode D6 is connected with the negative electrode of commutation diode D7 and one end of resistance R 31 respectively, the other end of resistance R 31 is connected with the voltage output end VC2 of electric ballast.
4. LED light source load detecting circuit as claimed in claim 1, is characterized in that, described LED current control module comprises:
Resistance R 1-R6, capacitor C 1-C2, amplifier U1A, wherein, one end of described resistance R 1 respectively with LED lighting module, one end of one end of resistance R 2 and resistance R 3 connects, the other end of resistance R 1 respectively with the other end of resistance R 2, one end of ground and resistance R 4 connects, the other end of resistance R 3 respectively with the electrode input end of amplifier U1A, one end of resistance R 5, one end of capacitor C 1 connects, the other end of resistance R 4 respectively with one end of capacitor C 2, one end of the negative input of amplifier U1A and resistance R 6 connects, the other end of capacitor C 1, the other end of resistance R 5, the other end of capacitor C 2 is all connected with ground, the output terminal of the other end of resistance R 6 and amplifier U1A is connected with the input end of LED current detecting indicating module respectively.
5. LED light source load detecting circuit as claimed in claim 1, is characterized in that, described LED current detecting indicating module comprises:
Resistance R 7-R19, resistance R 32, capacitor C 3, capacitor C 5-C6, amplifier U1B, amplifier U1C, amplifier U1D, triode Q2, commutation diode D3-D4, LED LED-G, LED LED-R, LED LED-B, wherein, one end of described resistance R 18 is connected with LED current control module, the other end of resistance R 18 respectively with the positive pole of capacitor C 3, positive polarity output terminal VOUT+, the electrode input end of one end of resistance R 32 and amplifier U1B connects, the negative input of amplifier U1B respectively with one end of resistance R 8, one end of resistance R 7 connects, the other end of resistance R 7 is connected with 2.5V reference voltage Vref 2.5V, the anodic bonding of the output terminal of amplifier U1B and LED LED-G, the negative electrode of LED LED-G is connected with one end of resistance R 9, the other end of resistance R 9 is connected with the emitter of triode Q2, the base stage of triode Q2 respectively with one end of resistance R 16, one end of resistance R 19, one end of resistance R 15 connects, the other end of resistance R 16, the collector of triode Q2, the other end of resistance R 8, the other end of resistance R 32, the negative pole of capacitor C 3 is all connected with ground, the other end of resistance R 15 is connected with the negative electrode of commutation diode D3, the anode of commutation diode D3 respectively with the anode of LED LED-B, the output terminal of amplifier U1C connects, the negative electrode of LED LED-B is connected with one end of resistance R 12, the negative input of amplifier U1C respectively with one end of resistance R 10, one end of resistance R 11 connects, the other end of resistance R 10 is connected with 2.5V reference voltage Vref 2.5V, the electrode input end of amplifier U1C is connected with one end of positive polarity output terminal VOUT+ and capacitor C 5 respectively, the other end of capacitor C 5, the other end of resistance R 11, the other end of resistance R 12 is all connected with ground, the other end of resistance R 19 is connected with the negative electrode of commutation diode D4, the anode of commutation diode D4 respectively with the output terminal of amplifier U1D, the anodic bonding of LED LED-R, the negative electrode of LED LED-R is connected with one end of resistance R 17, the negative input of amplifier U1D is connected with one end of positive polarity output terminal VOUT+ and capacitor C 6 respectively, the electrode input end of amplifier U1D respectively with one end of resistance R 13, one end of resistance R 14 connects, the other end of resistance R 13 is connected with 2.5V reference voltage Vref 2.5V, the other end of resistance R 17, the other end of resistance R 14, the other end of capacitor C 6 is all connected with ground.
6. LED light source load detecting circuit as claimed in claim 2, is characterized in that, described auxiliary VCC voltage and reference voltage module comprise:
Resistance R 22-R25, capacitor C 7-C9, commutation diode D1-D2, triode Q1, voltage stabilizing diode ZD1, controllable accurate source of stable pressure U2, wherein, the anode of commutation diode D1 is connected with output terminal and the LED lighting module of secondary rectification filtering module respectively, the negative electrode of commutation diode D1 is connected with one end of resistance R 22 and one end of resistance R 23 respectively, the other end of resistance R 22 respectively with the positive pole of capacitor C 7, the other end of resistance R 23, the collector of one end of resistance R 24 and triode Q1 connects, the other end of resistance R 24 is connected with the base stage of triode Q1 and the negative electrode of voltage stabilizing diode ZD1 respectively, the anodic bonding of the emitter of triode Q1 and commutation diode D2, the negative electrode of commutation diode D2 respectively with the positive pole of capacitor C 8, one end of power supply VCC and resistance R 25 connects, the other end of resistance R 25 respectively with the negative electrode of controllable accurate source of stable pressure U2, the reference utmost point of controllable accurate source of stable pressure U2, one end of 2.5V reference voltage Vref 2.5V and capacitor C 9 connects, the negative pole of capacitor C 7, the anode of voltage stabilizing diode ZD1, the negative pole of capacitor C 8, the anode of controllable accurate source of stable pressure U2, the other end of capacitor C 9 is all connected with ground.
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| CN104181426B (en) | 2017-06-09 |
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