CN202634839U - Light emitting diode (LED) drive circuit and LED lighting lamp - Google Patents
Light emitting diode (LED) drive circuit and LED lighting lamp Download PDFInfo
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- CN202634839U CN202634839U CN 201220299090 CN201220299090U CN202634839U CN 202634839 U CN202634839 U CN 202634839U CN 201220299090 CN201220299090 CN 201220299090 CN 201220299090 U CN201220299090 U CN 201220299090U CN 202634839 U CN202634839 U CN 202634839U
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Abstract
The utility model discloses a light emitting diode (LED) drive circuit and an LED lighting lamp, wherein the LED drive circuit comprises a transformer, a voltage regulation feedback control circuit, a first inductor which comprises a first winding and a second winding, a second inductor which comprises a third winding and a fourth winding, a plurality of rectifying and filtering circuits, a plurality of LED lamp strips and a current detection circuit; a dotted terminal of a first secondary winding of the transformer is connected with an input end of a rectifying and filtering circuit through the first winding; one end of the second winding is connected with the dotted terminal of the first secondary winding, and the other end of the second winding is connected with an input end of a rectifying and filtering circuit through the third winding and connected with an input end of another rectifying and filtering circuit through the fourth winding; an output end of each rectifying and filtering circuit is connected with the anode of the corresponding LED lamp strip; the cathode of each LED lamp strip is connected with the current detection circuit; and the current detection circuit is connected with the voltage regulation feedback control circuit. By the LED drive circuit and LED lighting lamp, the efficiency of the circuit is improved, and cost of the circuit is reduced.
Description
Technical field
The utility model relates to the LED technical field, relates in particular to a kind of led drive circuit and LED illuminating lamp.
Background technology
In the prior art, normally adopt the drive circuit that contains the LED constant-current control circuit to come driving LED lamp bar, can constant current stably work to guarantee each LED lamp bar.
As shown in Figure 1, Fig. 1 is the electrical block diagram of a kind of led drive circuit in the prior art.This circuit comprises ac power input end 101 (containing live wire input L01 and zero line input N01), EMI (Electron-Magnetic Interference; Electromagnetic interference) filter circuit 102, bridge rectifier 103, DC-DC control circuit 104, transformer T2, diode D6, polar capacitor E5, LED constant-current control circuit 105, voltage stabilizing feedback control circuit 106 and some LED lamp bars, each LED lamp bar forms by some LED lamp series connection.Wherein, transformer T2 comprises elementary winding S21, the first secondary winding S22 and second subprime winding S23.Voltage stabilizing feedback control circuit 106 comprises diode D7, polar capacitor E6, capacitor C 3, thyristor Q3, resistance R 7, resistance R 8, resistance R 9 and optocoupler OT2.
Particularly; EMI filter circuit 102 is connected between the input of ac power input end 101 and bridge rectifier 103; The output of bridge rectifier 103 is connected with the different name end of the elementary winding S21 of transformer T2, and the end of the same name of the elementary winding S21 of transformer T2 is connected with the output of DC-DC control circuit 104.The anode of diode D6 is connected with the end of the same name of the first secondary winding S22 of transformer T2; The negative electrode of diode D6 is connected with the input of LED constant-current control circuit 105; And be connected with the positive pole of polar capacitor E5; The minus earth of polar capacitor E5, the output of LED constant-current control circuit 105 are connected with corresponding LED lamp bar respectively.The anode of diode D7 in the voltage stabilizing feedback control circuit 106 is connected with the end of the same name of the second subprime winding S23 of transformer T2, and the anode of the light-emitting diode of the negative electrode of diode D7 in resistance R 7 and optocoupler OT2 is connected; The minus earth of polar capacitor E6, the positive pole of polar capacitor E6 is connected with the negative electrode of diode D7, and resistance R 8 and resistance R 9 ground connection through connecting each other; The control end of thyristor Q3 is connected between resistance R 8 and the resistance R 9, the plus earth of thyristor Q3, and the negative electrode of the light-emitting diode among the negative electrode of thyristor Q3 and the optocoupler OT2 is connected; One end of capacitor C 3 is connected with the negative electrode of thyristor Q3, and the other end of capacitor C 3 is connected with the negative electrode of diode D7; The collector electrode of the triode among the optocoupler OT2 is connected with an input of DC-DC control circuit 104, and the emitter of the triode among the optocoupler OT2 is connected with another input of DC-DC control circuit 104.The different name end of the first secondary winding S22 of transformer T2 and the equal ground connection of different name end of second subprime winding S23.
Led drive circuit shown in Figure 1 need be used LED constant-current control circuit 105; Could guarantee the constant current steady operation of each LED lamp bar; Yet; Existing LED constant-current control circuit 105 comprises the DC-DC converter circuit, thereby causes led drive circuit shown in Figure 1 to have that efficient is low, power consumption reaches defect of high cost greatly.
The utility model content
The main purpose of the utility model provides a kind of led drive circuit, is intended to improve circuit efficiency, reduces circuit power consumption, and reduces circuit cost.
In order to achieve the above object; The utility model proposes a kind of led drive circuit, and this led drive circuit comprises transformer, voltage stabilizing feedback control circuit, some LED lamp bars, first inductor, second inductor, first current rectifying and wave filtering circuit, second current rectifying and wave filtering circuit, the 3rd current rectifying and wave filtering circuit and is used for the current detection circuit that the electric current to said LED lamp bar detects; Said transformer comprises elementary winding, first secondary winding and second subprime winding; Each said LED lamp bar includes anode tap and cathode terminal; Said first inductor comprises first winding and second winding; Said second inductor comprises the tertiary winding and the 4th winding; Wherein:
The end of the same name of first secondary winding of said transformer is connected with the input of said first current rectifying and wave filtering circuit through said first winding; One end of said second winding is connected with the end of the same name of first secondary winding of said transformer, and its other end is connected with the input of said second current rectifying and wave filtering circuit and is connected with the input of said the 3rd current rectifying and wave filtering circuit through said the 4th winding through the said tertiary winding respectively; The output of said first current rectifying and wave filtering circuit, second current rectifying and wave filtering circuit and the 3rd current rectifying and wave filtering circuit is connected with the anode tap of corresponding said LED lamp bar respectively; The cathode terminal of each said LED lamp bar all is connected with the input of said current detection circuit; The output of said current detection circuit is connected with said voltage stabilizing feedback control circuit.
Preferably, said first current rectifying and wave filtering circuit comprises first diode and first polar capacitor; Said second current rectifying and wave filtering circuit comprises second diode and second polar capacitor; Said the 3rd current rectifying and wave filtering circuit comprises the 3rd diode and the 3rd polar capacitor; Wherein:
The anode of first diode is connected through the end of the same name of said first winding with first secondary winding of said transformer, and its negative electrode is connected with the positive pole of first polar capacitor, and is connected with the anode tap of corresponding said LED lamp bar; The minus earth of first polar capacitor; The anode of second diode is connected with the end of the same name of first secondary winding of said transformer via the said tertiary winding, second winding successively, and its negative electrode is connected with the positive pole of second polar capacitor, and is connected with the anode tap of corresponding said LED lamp bar; The minus earth of second polar capacitor; The anode of the 3rd diode is connected with the end of the same name of first secondary winding of said transformer via said the 4th winding, second winding successively, and its negative electrode is connected with the positive pole of the 3rd polar capacitor, and is connected with the anode tap of corresponding said LED lamp bar; The minus earth of the 3rd polar capacitor.
Preferably, the number of turn of the number of turn of the tertiary winding of the number of turn of the number of turn of first winding of said first inductor, second winding, said second inductor and the 4th winding thereof all equates.
Preferably, said current detection circuit comprises first resistance, second resistance, the 3rd resistance, the 4th diode, first electric capacity and triode; Wherein:
One end of said first resistance is connected with the cathode terminal of each said LED lamp bar; And be connected with the anode of said the 4th diode; The other end ground connection of said first resistance; The negative electrode of said the 4th diode is connected with an end of said the 3rd resistance and an end of said first electric capacity respectively through said second resistance, and is connected with the base stage of said triode, the equal ground connection of the other end of the other end of said the 3rd resistance and said first electric capacity; The collector electrode of said triode is connected the grounded emitter of said triode with said voltage stabilizing feedback control circuit.
Preferably, said triode is the NPN triode.
Preferably, said led drive circuit also comprises ac power input end, EMI filter circuit, bridge rectifier and DC-DC control circuit; Wherein:
Said EMI filter circuit is connected between the input of said ac power input end and said bridge rectifier; The output of said bridge rectifier is connected with the different name end of the elementary winding of said transformer; The end of the same name of the elementary winding of said transformer is connected with the output of said DC-DC control circuit; The input of said DC-DC control circuit is connected with the output of said voltage stabilizing feedback control circuit; The input of said voltage stabilizing feedback control circuit is connected with the end of the same name of the second subprime winding of said transformer, the equal ground connection of different name end of the different name end of first secondary winding of said transformer and second subprime winding.
Preferably, said voltage stabilizing feedback control circuit comprises the 5th diode, second electric capacity, quadripolarity electric capacity, thyristor, the 4th resistance, the 5th resistance, the 6th resistance and optocoupler; Wherein:
The anode of the 5th diode is connected with the end of the same name of the second subprime winding of said transformer, and the anode of its negative electrode light-emitting diode in the 4th resistance and optocoupler is connected; The minus earth of quadripolarity electric capacity, its positive pole is connected with the negative electrode of the 5th diode, and the 5th resistance and the 6th grounding through resistance through connecting each other; The control end of thyristor is connected between the 5th resistance and the 6th resistance, the plus earth of thyristor, and the negative electrode of the light-emitting diode in the negative electrode of thyristor and the optocoupler is connected; One end of second electric capacity is connected with the negative electrode of thyristor, and its other end is connected between the 5th resistance and the 6th resistance; The collector electrode of the triode in the optocoupler is connected with an input of said DC-DC control circuit, and the emitter of the triode in the optocoupler is connected with another input of said DC-DC control circuit.
Preferably, the negative electrode of the light-emitting diode in the collector electrode of the triode in the said current detection circuit and the said optocoupler is connected.
The utility model also proposes a kind of LED illuminating lamp; Said LED illuminating lamp comprises led drive circuit, and said led drive circuit comprises transformer, voltage stabilizing feedback control circuit, some LED lamp bars, first inductor, second inductor, first current rectifying and wave filtering circuit, second current rectifying and wave filtering circuit, the 3rd current rectifying and wave filtering circuit and is used for the current detection circuit that the electric current to said LED lamp bar detects; Said transformer comprises elementary winding, first secondary winding and second subprime winding; Each said LED lamp bar includes anode tap and cathode terminal; Said first inductor comprises first winding and second winding; Said second inductor comprises the tertiary winding and the 4th winding; Wherein:
The end of the same name of first secondary winding of said transformer is connected with the input of said first current rectifying and wave filtering circuit through said first winding; One end of said second winding is connected with the end of the same name of first secondary winding of said transformer, and its other end is connected with the input of said second current rectifying and wave filtering circuit and is connected with the input of said the 3rd current rectifying and wave filtering circuit through said the 4th winding through the said tertiary winding respectively; The output of said first current rectifying and wave filtering circuit, second current rectifying and wave filtering circuit and the 3rd current rectifying and wave filtering circuit is connected with the anode tap of corresponding said LED lamp bar respectively; The cathode terminal of each said LED lamp bar all is connected with the input of said current detection circuit; The output of said current detection circuit is connected with said voltage stabilizing feedback control circuit.
The led drive circuit that the utility model proposes adopts two inductors, some diodes and some polar capacitors to substitute the LED constant-current control circuit of led drive circuit in the prior art, to realize the constant current work of driving LED lamp bar.And; The utility model has also adopted a current detection circuit that the electric current of LED lamp bar in the circuit is detected, and when electric current was excessive, the luminous intensity of the optocoupler of current detection circuit in can control circuit strengthened; Be connected in the DC-DC of primary winding control circuit through optocoupler again; Voltage with control LED lamp bar descends, and its electric current is reduced, thereby guaranteed the constant current steady operation of LED lamp bar.The utility model in the LED lamp bar constant current steady operation, has also improved circuit efficiency in guaranteeing circuit, reduced circuit power consumption, and reduced circuit cost.
Description of drawings
Fig. 1 is the electrical block diagram of a kind of led drive circuit in the prior art;
Fig. 2 is the electrical block diagram of the utility model led drive circuit preferred embodiment.
The realization of the utility model purpose, functional characteristics and advantage will combine embodiment, further specify with reference to accompanying drawing.
Embodiment
Further specify the technical scheme of the utility model below in conjunction with Figure of description and specific embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
Fig. 2 is the electrical block diagram of the utility model led drive circuit preferred embodiment.
With reference to Fig. 2, the utility model led drive circuit comprises ac power input end 201 (containing live wire input L1 and zero line input N2), EMI filter circuit 202, bridge rectifier 203, DC-DC control circuit 204, transformer T1, voltage stabilizing feedback control circuit 205, the first inductor L1, the second inductor L2, first current rectifying and wave filtering circuit 206, second current rectifying and wave filtering circuit 207, the 3rd current rectifying and wave filtering circuit 208, some LED lamp bars and is used for the current detection circuit 209 that the electric current to LED lamp bar detects.
Wherein, the first inductor L1 comprises first winding L 11 and second winding L 12; The second inductor L2 comprises tertiary winding L21 and the 4th winding L 22; Transformer T1 comprises elementary winding S1, the first secondary winding S2 and second subprime winding S3; Each LED lamp bar includes an anode tap and a cathode terminal, and each LED lamp bar forms by some LED lamp series connection.The number of turn of the tertiary winding L21 of the number of turn of first winding L 11 of the first inductor L1, the number of turn of second winding L 12, the second inductor L2 and the number of turn of the 4th winding L 22 all equate.
Particularly; EMI filter circuit 202 is connected between the input of ac power input end 201 and bridge rectifier 203; The output of bridge rectifier 203 is connected with the different name end of the elementary winding S1 of transformer T1; The end of the same name of the elementary winding S1 of transformer T1 is connected with the output of DC-DC control circuit 204; The input of DC-DC control circuit 204 is connected with the output of voltage stabilizing feedback control circuit 205, and the input of voltage stabilizing feedback control circuit 205 is connected with the end of the same name of the second subprime winding S3 of transformer T1, the different name end of the first secondary winding S2 of transformer T1 and the equal ground connection of different name end of second subprime winding S3;
The end of the same name of the first secondary winding S2 of transformer T1 is connected with the input of first current rectifying and wave filtering circuit 206 through first winding L 11 of the first inductor L1; One end of second winding L 12 of the first inductor L1 is connected with the end of the same name of the first secondary winding S2 of transformer T1, and the other end of second winding L 12 of the first inductor L1 is connected with the input of second current rectifying and wave filtering circuit 207 and the 4th winding L 22 of the warp second inductor L2 is connected with the input of the 3rd current rectifying and wave filtering circuit 208 through the tertiary winding L21 of the second inductor L2 respectively; The output of first current rectifying and wave filtering circuit 206, second current rectifying and wave filtering circuit 207 and the 3rd current rectifying and wave filtering circuit 208 is connected with the anode tap of corresponding LED lamp bar respectively; The cathode terminal of each LED lamp bar all is connected with the input of current detection circuit 209; The output of current detection circuit 209 is connected with voltage stabilizing feedback control circuit 205;
First current rectifying and wave filtering circuit 206 comprises the first diode D1 and the first polar capacitor E1; Second current rectifying and wave filtering circuit 207 comprises the second diode D2 and the second polar capacitor E2; The 3rd current rectifying and wave filtering circuit 208 comprises the 3rd diode D3 and the 3rd polar capacitor E3;
Particularly; The anode of the first diode D1 is connected with the end of the same name of the first secondary winding S2 of transformer T1 through first winding L 11 of the first inductor L1; The negative electrode of the first diode D1 is connected with the positive pole of the first polar capacitor E1, and is connected with the anode tap of corresponding LED lamp bar; The minus earth of the first polar capacitor E1; The anode of the second diode D2 is connected with the end of the same name of the first secondary winding S2 of transformer T1 via the tertiary winding L21 of the second inductor L2, second winding L 12 of the first inductor L1 successively; The negative electrode of the second diode D2 is connected with the positive pole of the second polar capacitor E2, and is connected with the anode tap of corresponding LED lamp bar; The minus earth of the second polar capacitor E2; The anode of the 3rd diode D3 is connected with the end of the same name of the first secondary winding S2 of transformer T1 via the 4th winding L 22 of the second inductor L2, second winding L 12 of the first inductor L1 successively; The negative electrode of the 3rd diode D3 is connected with the positive pole of the 3rd polar capacitor E3, and is connected with the anode tap of corresponding LED lamp bar; The minus earth of the 3rd polar capacitor E3.
Particularly, an end of first resistance R 1 is the input of current detection circuit 209, is connected with the cathode terminal of each LED lamp bar; And be connected with the anode of the 4th diode D4; The other end ground connection of first resistance R 1, the negative electrode of the 4th diode D4 is connected with an end of the 3rd resistance R 3 and an end of first capacitor C 1 respectively through second resistance R 2, and is connected with the base stage of triode Q1; The equal ground connection of the other end of the other end of the 3rd resistance R 3 and first capacitor C 1; The current collection of triode Q1 is the output of current detection circuit 209 very, is connected the grounded emitter of triode Q1 with voltage stabilizing feedback control circuit 205.
Voltage stabilizing feedback control circuit 205 comprises the 5th diode D5, quadripolarity electric capacity E4, second capacitor C 2, thyristor Q2, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6 and optocoupler OT1;
Particularly, the anode of the 5th diode D5 is the input of voltage stabilizing feedback control circuit 205, is connected with the end of the same name of the second subprime winding S3 of transformer T1, and the anode of the light-emitting diode of the negative electrode of the 5th diode D5 in the 4th resistance R 4 and optocoupler OT1 is connected; The minus earth of quadripolarity electric capacity E4, the positive pole of quadripolarity electric capacity E4 is connected with the negative electrode of the 5th diode D5, and the 5th resistance R 5 and the 6th resistance R 6 ground connection through connecting each other; The control end of thyristor Q2 is connected between the 5th resistance R 5 and the 6th resistance R 6, the plus earth of thyristor Q2, and the negative electrode of the light-emitting diode among the negative electrode of thyristor Q2 and the optocoupler OT1 is connected; The negative electrode of the light-emitting diode among the optocoupler OT1 also is connected with the output (being the collector electrode of triode Q1) of current detection circuit 209; One end of second capacitor C 2 is connected with the negative electrode of thyristor Q2, and the other end of second capacitor C 2 is connected between the 5th resistance R 5 and the 6th resistance R 6; The current collection of the triode among the optocoupler OT1 is the output of voltage stabilizing feedback control circuit 205 very, is connected with an input of DC-DC control circuit 204, and the emitter of the triode among the optocoupler OT1 is connected with another input of DC-DC control circuit 204.
The utility model led drive circuit; Because the number of turn of the tertiary winding L21 of the number of turn of first winding L 11 of the first inductor L1, the number of turn of second winding L 12, the second inductor L2 and the number of turn of the 4th winding L 22 all equate; Therefore; The electric current that flows through each LED lamp bar all equates, thereby makes the electric current of each LED lamp bar reach balance.After the utility model led drive circuit powers on; Operating current parameter according to LED lamp bar; The required operating voltage of LED lamp bar is set; The utility model is given each LED lamp bar through the work of voltage stabilizing feedback control circuit 205 control DC-DC control circuits 204 to export suitable voltage, is under the normal operating voltage condition to guarantee each LED lamp bar.Yet; When the electric current of LED lamp bar is excessive, the voltage of first resistance R 1 in the current detection circuit 209 also will increase, and the voltage on first resistance R 1 is added to the base stage of triode Q1 through the 4th diode D4, second resistance R 2, the 3rd resistance R 3, first capacitor C 1; Make triode Q1 conducting; The conducting of triode Q1 will make the luminous intensity of the light-emitting diode among the light idol OT1 strengthen, and optocoupler OT1 cooperates DC-DC control circuit 204 again, descends with the voltage of control LED lamp bar; Its electric current is reduced, thereby guaranteed the constant current steady operation of each the LED lamp bar in the utility model led drive circuit.
The led drive circuit that the utility model proposes adopts two inductors, some diodes and some polar capacitors to substitute the LED constant-current control circuit of led drive circuit in the prior art, to realize the constant current work of driving LED lamp bar.And; The utility model has also adopted a current detection circuit that the electric current of LED lamp bar in the circuit is detected, and when electric current was excessive, the luminous intensity of the optocoupler of current detection circuit in can control circuit strengthened; Be connected in the DC-DC of primary winding control circuit through optocoupler again; Voltage with control LED lamp bar descends, and its electric current is reduced, thereby guaranteed the constant current steady operation of LED lamp bar.The utility model in the LED lamp bar constant current steady operation, has also improved circuit efficiency in guaranteeing circuit, reduced circuit power consumption, and reduced circuit cost.
The utility model also proposes a kind of LED illuminating lamp, and this LED illuminating lamp comprises led drive circuit, and the circuit structure of its led drive circuit is identical with the circuit structure of the described led drive circuit of top embodiment, repeats no more here.
The above is merely the preferred embodiment of the utility model; Be not thus the restriction the utility model claim; Every equivalent structure or equivalent flow process conversion that utilizes the utility model specification and accompanying drawing content to be done; Or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the utility model.
Claims (9)
1. a led drive circuit comprises transformer, voltage stabilizing feedback control circuit and some LED lamp bars; Said transformer comprises elementary winding, first secondary winding and second subprime winding; Each said LED lamp bar includes anode tap and cathode terminal; It is characterized in that:
Also comprise first inductor, second inductor, first current rectifying and wave filtering circuit, second current rectifying and wave filtering circuit, the 3rd current rectifying and wave filtering circuit and be used for the current detection circuit that the electric current to said LED lamp bar detects; Said first inductor comprises first winding and second winding; Said second inductor comprises the tertiary winding and the 4th winding; Wherein:
The end of the same name of first secondary winding of said transformer is connected with the input of said first current rectifying and wave filtering circuit through said first winding; One end of said second winding is connected with the end of the same name of first secondary winding of said transformer, and its other end is connected with the input of said second current rectifying and wave filtering circuit and is connected with the input of said the 3rd current rectifying and wave filtering circuit through said the 4th winding through the said tertiary winding respectively; The output of said first current rectifying and wave filtering circuit, second current rectifying and wave filtering circuit and the 3rd current rectifying and wave filtering circuit is connected with the anode tap of corresponding said LED lamp bar respectively; The cathode terminal of each said LED lamp bar all is connected with the input of said current detection circuit; The output of said current detection circuit is connected with said voltage stabilizing feedback control circuit.
2. led drive circuit according to claim 1 is characterized in that, said first current rectifying and wave filtering circuit comprises first diode and first polar capacitor; Said second current rectifying and wave filtering circuit comprises second diode and second polar capacitor; Said the 3rd current rectifying and wave filtering circuit comprises the 3rd diode and the 3rd polar capacitor; Wherein:
The anode of first diode is connected through the end of the same name of said first winding with first secondary winding of said transformer, and its negative electrode is connected with the positive pole of first polar capacitor, and is connected with the anode tap of corresponding said LED lamp bar; The minus earth of first polar capacitor; The anode of second diode is connected with the end of the same name of first secondary winding of said transformer via the said tertiary winding, second winding successively, and its negative electrode is connected with the positive pole of second polar capacitor, and is connected with the anode tap of corresponding said LED lamp bar; The minus earth of second polar capacitor; The anode of the 3rd diode is connected with the end of the same name of first secondary winding of said transformer via said the 4th winding, second winding successively, and its negative electrode is connected with the positive pole of the 3rd polar capacitor, and is connected with the anode tap of corresponding said LED lamp bar; The minus earth of the 3rd polar capacitor.
3. led drive circuit according to claim 2 is characterized in that, the number of turn of the tertiary winding of the number of turn of first winding of said first inductor, the number of turn of second winding, said second inductor and the number of turn of the 4th winding thereof all equate.
4. led drive circuit according to claim 3 is characterized in that, said current detection circuit comprises first resistance, second resistance, the 3rd resistance, the 4th diode, first electric capacity and triode; Wherein:
One end of said first resistance is connected with the cathode terminal of each said LED lamp bar; And be connected with the anode of said the 4th diode; The other end ground connection of said first resistance; The negative electrode of said the 4th diode is connected with an end of said the 3rd resistance and an end of said first electric capacity respectively through said second resistance, and is connected with the base stage of said triode, the equal ground connection of the other end of the other end of said the 3rd resistance and said first electric capacity; The collector electrode of said triode is connected the grounded emitter of said triode with said voltage stabilizing feedback control circuit.
5. led drive circuit according to claim 4 is characterized in that, said triode is the NPN triode.
6. led drive circuit according to claim 5 is characterized in that, said led drive circuit also comprises ac power input end, EMI filter circuit, bridge rectifier and DC-DC control circuit; Wherein:
Said EMI filter circuit is connected between the input of said ac power input end and said bridge rectifier; The output of said bridge rectifier is connected with the different name end of the elementary winding of said transformer; The end of the same name of the elementary winding of said transformer is connected with the output of said DC-DC control circuit; The input of said DC-DC control circuit is connected with the output of said voltage stabilizing feedback control circuit; The input of said voltage stabilizing feedback control circuit is connected with the end of the same name of the second subprime winding of said transformer, the equal ground connection of different name end of the different name end of first secondary winding of said transformer and second subprime winding.
7. led drive circuit according to claim 6 is characterized in that, said voltage stabilizing feedback control circuit comprises the 5th diode, second electric capacity, quadripolarity electric capacity, thyristor, the 4th resistance, the 5th resistance, the 6th resistance and optocoupler; Wherein:
The anode of the 5th diode is connected with the end of the same name of the second subprime winding of said transformer, and the anode of its negative electrode light-emitting diode in the 4th resistance and optocoupler is connected; The minus earth of quadripolarity electric capacity, its positive pole is connected with the negative electrode of the 5th diode, and the 5th resistance and the 6th grounding through resistance through connecting each other; The control end of thyristor is connected between the 5th resistance and the 6th resistance, the plus earth of thyristor, and the negative electrode of the light-emitting diode in the negative electrode of thyristor and the optocoupler is connected; One end of second electric capacity is connected with the negative electrode of thyristor, and its other end is connected between the 5th resistance and the 6th resistance; The collector electrode of the triode in the optocoupler is connected with an input of said DC-DC control circuit, and the emitter of the triode in the optocoupler is connected with another input of said DC-DC control circuit.
8. led drive circuit according to claim 7 is characterized in that, the negative electrode of the light-emitting diode in the collector electrode of the triode in the said current detection circuit and the said optocoupler is connected.
9. a LED illuminating lamp is characterized in that, comprises each described led drive circuit among the claim 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220299090 CN202634839U (en) | 2012-06-25 | 2012-06-25 | Light emitting diode (LED) drive circuit and LED lighting lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220299090 CN202634839U (en) | 2012-06-25 | 2012-06-25 | Light emitting diode (LED) drive circuit and LED lighting lamp |
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| Publication Number | Publication Date |
|---|---|
| CN202634839U true CN202634839U (en) | 2012-12-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220299090 Expired - Fee Related CN202634839U (en) | 2012-06-25 | 2012-06-25 | Light emitting diode (LED) drive circuit and LED lighting lamp |
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| CN (1) | CN202634839U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016109919A1 (en) * | 2015-01-05 | 2016-07-14 | 东莞励国照明有限公司 | Led drive circuit |
| CN106409239A (en) * | 2016-09-09 | 2017-02-15 | 广州视源电子科技股份有限公司 | LED backlight drive circuit |
| CN107968575A (en) * | 2017-12-25 | 2018-04-27 | 广州金升阳科技有限公司 | A kind of feedback control circuit |
| CN112822815A (en) * | 2021-02-01 | 2021-05-18 | 惠州雷士光电科技有限公司 | LED drive circuit and lighting equipment |
-
2012
- 2012-06-25 CN CN 201220299090 patent/CN202634839U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016109919A1 (en) * | 2015-01-05 | 2016-07-14 | 东莞励国照明有限公司 | Led drive circuit |
| CN106409239A (en) * | 2016-09-09 | 2017-02-15 | 广州视源电子科技股份有限公司 | LED backlight drive circuit |
| CN106409239B (en) * | 2016-09-09 | 2019-11-26 | 广州视源电子科技股份有限公司 | A kind of LED backlight drive circuit |
| CN107968575A (en) * | 2017-12-25 | 2018-04-27 | 广州金升阳科技有限公司 | A kind of feedback control circuit |
| CN112822815A (en) * | 2021-02-01 | 2021-05-18 | 惠州雷士光电科技有限公司 | LED drive circuit and lighting equipment |
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