Summary of the invention
The object of the present invention is to provide a kind of led drive circuit, be intended to solve the problem that there is unstable working condition in existing LED illuminator.
The present invention is achieved in that a kind of led drive circuit, and described led drive circuit comprises:
With the energy storage device that the output of ballast is connected, the inductance of described energy storage device and described ballast constitutes the loop, produces exciting current, makes the oscillating circuit of described ballast keep operate as normal, the output low-voltage AC; And
The driver module that is connected with the LED lamp with described energy storage device respectively, described driver module is converted to direct current with the low-voltage AC of described ballast output, drives the work of described LED lamp;
Described energy storage device is second inductance, described driver module comprises first inductance, first electric capacity, diode, bridge rectifier and electronic switching tube, the two ends of described second inductance connect the output of described ballast respectively, the two ends of described second inductance also connect the input of described bridge rectifier respectively, first output of described bridge rectifier is by first inductance and the drain electrode that connects electronic switching tube of LED lamp of serial connection, the source electrode of described electronic switching tube connects second output of bridge rectifier, described first electric capacity is in parallel with described LED lamp, the anode of described diode connects the drain electrode of described electronic switching tube, and the negative electrode of described diode connects first output of described bridge rectifier;
Perhaps, described energy storage device is second electric capacity, described driver module comprises first inductance, first electric capacity, diode, bridge rectifier and electronic switching tube, the two ends of described second electric capacity connect the output of described ballast respectively, the two ends of described second electric capacity also connect the input of described bridge rectifier respectively, first output of described bridge rectifier is by first inductance and the drain electrode that connects electronic switching tube of LED lamp of serial connection, the source electrode of described electronic switching tube connects second output of bridge rectifier, described first electric capacity is in parallel with described LED lamp, the anode of described diode connects the drain electrode of described electronic switching tube, and the negative electrode of described diode connects first output of described bridge rectifier;
Perhaps, described energy storage device is second inductance, described driver module comprises first inductance, first electric capacity, diode, bridge rectifier and electronic switching tube, the two ends of described second inductance connect the output of described ballast respectively, the two ends of described second inductance also connect the input of described bridge rectifier respectively, the first output first via of described bridge rectifier connects the drain electrode of electronic switching tube by first inductance, the source electrode of described electronic switching tube connects second output of bridge rectifier, first output the second tunnel of described bridge rectifier connects the negative electrode of diode by first electric capacity, the first output Third Road of described bridge rectifier connects the negative electrode of diode by the LED lamp, and the anode of described diode connects the drain electrode of described electronic switching tube;
Perhaps, described energy storage device is second electric capacity, described driver module comprises first inductance, first electric capacity, diode, bridge rectifier and electronic switching tube, the two ends of described second electric capacity connect the output of described ballast respectively, the two ends of described second electric capacity also connect the input of described bridge rectifier respectively, the first output first via of described bridge rectifier connects the drain electrode of electronic switching tube by first inductance, the source electrode of described electronic switching tube connects second output of bridge rectifier, first output the second tunnel of described bridge rectifier connects the negative electrode of diode by first electric capacity, the first output Third Road of described bridge rectifier connects the negative electrode of diode by the LED lamp, and the anode of described diode connects the drain electrode of described electronic switching tube.
Another object of the present invention is to provide a kind of LED light fixture, described LED light fixture comprises a plurality of LED lamps, and described LED light fixture also comprises above-mentioned led drive circuit.
Another object of the present invention is to provide a kind of LED illuminator, described LED illuminator comprises ballast, and described LED illuminator also comprises and being connected with described ballast, above-mentioned LED light fixture.
In the present invention, the energy storage device of led drive circuit and the inductance of ballast constitute the loop, produce exciting current, make the oscillating circuit of ballast keep operate as normal, therefore ballast is when driving low power LED light fixture, can not be in intermittence or the state that quits work fully, make that the operating state of LED illuminator is highly stable.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the present invention, and be not used in restriction the present invention.
Fig. 2 shows the structure of the LED illuminator that the embodiment of the invention provides, and for convenience of explanation, only shows part related to the present invention.
The LED illuminator comprises ballast 100 and the LED light fixture 200 that is connected with ballast 100, LED light fixture 200 comprises a plurality of LED lamps 202, LED light fixture 200 also comprises respectively the led drive circuit 201 that is connected with LED lamp 202 with ballast 100, led drive circuit 201 comprises the energy storage device 2011 that is connected with the output of ballast 100, and the driver module 2012 that is connected with LED lamp 202 with energy storage device 2011 respectively.
Energy storage device 2011 constitutes the loop with the inductance of ballast 100, produces exciting current, makes the oscillating circuit of ballast 100 keep operate as normal, the output low-voltage AC; Driver module 2012 is converted to direct current with the low-voltage AC of ballast 100 outputs, 202 work of driving LED lamp.
Fig. 3 shows the exemplary circuit structure of the led drive circuit that first embodiment of the invention provides, and for convenience of explanation, only shows part related to the present invention.
Energy storage device 2011 is second inductance L 2, driver module 2012 comprises first inductance L 1, first capacitor C 1, diode D1, bridge rectifier U1 and electronic switching tube Q1, the two ends of second inductance L 2 connect the output of ballast 100 respectively, the two ends of second inductance L 2 also connect the input of bridge rectifier U1 respectively, first output of bridge rectifier U1 is by first inductance L 1 and LED lamp 202 drain electrode that meets electronic switching tube Q1 of serial connection, the source electrode of electronic switching tube Q1 connects second output of bridge rectifier U1, first capacitor C 1 is in parallel with LED lamp 202, the anode of diode D1 connects the drain electrode of electronic switching tube Q1, and the negative electrode of diode D1 connects first output of bridge rectifier U1.
The operation principle of this led drive circuit is:
Second inductance L 2 constitutes the loop with the inductance of ballast 100, produce exciting current, make the oscillating circuit of ballast 100 keep operate as normal, make that ballast 100 output voltages are normal, and second inductance L 2 can consumed power, so can play the effect of dummy load.
Bridge rectifier U1 is converted to direct voltage with the alternating voltage of ballast 100 outputs, during electronic switching tube Q1 conducting, the direct voltage of bridge rectifier U1 output provides energy for first inductance L 1, first inductance L, 1 storage power, when electronic switching tube Q1 ends, energy on first inductance L 1 releases energy to LED lamp 202 by diode D1, thereby lights LED lamp 202.
Fig. 4 shows the exemplary circuit structure of the led drive circuit that second embodiment of the invention provides, and for convenience of explanation, only shows part related to the present invention.
Energy storage device 2011 is second capacitor C 2, driver module 2012 comprises first inductance L 1, first capacitor C 1, diode D1, bridge rectifier U1 and electronic switching tube Q1, the two ends of second capacitor C 2 connect the output of ballast 100 respectively, the two ends of second capacitor C 2 also connect the input of bridge rectifier U1 respectively, first output of bridge rectifier U1 is by first inductance L 1 and LED lamp 202 drain electrode that meets electronic switching tube Q1 of serial connection, the source electrode of electronic switching tube Q1 connects second output of bridge rectifier U1, first capacitor C 1 is in parallel with LED lamp 202, the anode of diode D1 connects the drain electrode of electronic switching tube Q1, and the negative electrode of diode D1 connects first output of bridge rectifier U1.
The operation principle of this led drive circuit is:
Second capacitor C 2 constitutes the loop with the inductance of ballast 100, produce exciting current, make the oscillating circuit of ballast 100 keep operate as normal, make that ballast 100 output voltages are normal, and second capacitor C 2 can consumed power, so can play the effect of dummy load.
Bridge rectifier U1 is converted to direct voltage with the alternating voltage of ballast 100 outputs, during electronic switching tube Q1 conducting, the direct voltage of bridge rectifier U1 output provides energy for first inductance L 1, first inductance L, 1 storage power, when electronic switching tube Q1 ends, energy on first inductance L 1 releases energy to LED lamp 202 by diode D1, thereby lights LED lamp 202.
Fig. 5 shows the exemplary circuit structure of the led drive circuit that third embodiment of the invention provides, and for convenience of explanation, only shows part related to the present invention.
Energy storage device 2011 is second inductance L 2, driver module 2012 comprises first inductance L 1, first capacitor C 1, diode D1, bridge rectifier U1 and electronic switching tube Q1, the two ends of second inductance L 2 connect the output of ballast 100 respectively, the two ends of second inductance L 2 also connect the input of bridge rectifier U1 respectively, the first output first via of bridge rectifier U1 connects the drain electrode of electronic switching tube Q1 by first inductance L 1, the source electrode of electronic switching tube Q1 connects second output of bridge rectifier U1, first output the second tunnel of bridge rectifier U1 connects the negative electrode of diode D1 by first capacitor C 1, the first output Third Road of bridge rectifier U1 connects the negative electrode of diode D1 by LED lamp 202, and the anode of diode D1 connects the drain electrode of electronic switching tube Q1.
The operation principle of this led drive circuit is:
Second inductance L 2 constitutes the loop with the inductance of ballast 100, produce exciting current, make the oscillating circuit of ballast 100 keep operate as normal, make that ballast 100 output voltages are normal, and second inductance L 2 can consumed power, so can play the effect of dummy load.
Bridge rectifier U1 is converted to direct voltage with the alternating voltage of ballast 100 outputs, during electronic switching tube Q1 conducting, the direct voltage of bridge rectifier U1 output provides energy for first inductance L 1, first inductance L, 1 storage power, when electronic switching tube Q1 ended, the energy on first inductance L 1 released energy to LED lamp 202 by diode D1, thereby lights LED lamp 202, by the ON time of control electronic switching tube Q1, can control the energy storage size of first inductance L 1.
Fig. 6 shows the exemplary circuit structure of the led drive circuit that fourth embodiment of the invention provides, and for convenience of explanation, only shows part related to the present invention.
Energy storage device 2011 is second capacitor C 2, driver module 2012 comprises first inductance L 1, first capacitor C 1, diode D1, bridge rectifier U1 and electronic switching tube Q1, the two ends of second capacitor C 2 connect the output of ballast 100 respectively, the two ends of second capacitor C 2 also connect the input of bridge rectifier U1 respectively, the first output first via of bridge rectifier U1 connects the drain electrode of electronic switching tube Q1 by first inductance L 1, the source electrode of electronic switching tube Q1 connects second output of bridge rectifier U1, first output the second tunnel of bridge rectifier U1 connects the negative electrode of diode D1 by first capacitor C 1, the first output Third Road of bridge rectifier U1 connects the negative electrode of diode D1 by LED lamp 202, and the anode of diode D1 connects the drain electrode of electronic switching tube Q1.
The operation principle of this led drive circuit is:
Second capacitor C 2 constitutes the loop with the inductance of ballast 100, produce exciting current, make the oscillating circuit of ballast 100 keep operate as normal, make that ballast 100 output voltages are normal, and second capacitor C 2 can consumed power, so can play the effect of dummy load.
Bridge rectifier U1 is converted to direct voltage with the alternating voltage of ballast 100 outputs, during electronic switching tube Q1 conducting, the direct voltage of bridge rectifier U1 output provides energy for first inductance L 1, first inductance L, 1 storage power, when electronic switching tube Q1 ended, the energy on first inductance L 1 released energy to LED lamp 202 by diode D1, thereby lights LED lamp 202, by the ON time of control electronic switching tube Q1, can control the energy storage size of first inductance L 1.
In embodiments of the present invention, the energy storage device of led drive circuit and the inductance of ballast constitute the loop, produce exciting current, make the oscillating circuit of ballast keep operate as normal, therefore ballast is when driving low power LED light fixture, can not be in intermittence or the state that quits work fully, make that the operating state of LED illuminator is highly stable.
The above only is preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.