CN103167664A - Light-emitting diode (LED) constant current drive circuit and LED lighting device - Google Patents
Light-emitting diode (LED) constant current drive circuit and LED lighting device Download PDFInfo
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- CN103167664A CN103167664A CN2011104140375A CN201110414037A CN103167664A CN 103167664 A CN103167664 A CN 103167664A CN 2011104140375 A CN2011104140375 A CN 2011104140375A CN 201110414037 A CN201110414037 A CN 201110414037A CN 103167664 A CN103167664 A CN 103167664A
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Abstract
The invention discloses a light-emitting diode (LED) constant current drive circuit and an LED lighting device, wherein the LED constant current drive circuit comprises a power source and an LED load, the power source is connected with the LED load, and the LED constant current drive circuit further comprises a boost-type constant current output circuit and a power control circuit. The boost-type constant current output circuit is used for outputting constant current to the LED load, and the power control circuit is connected with the power source, the LED load and the boost-type constant current output circuit and used for conducting power supply control and protecting power supply of the LED load. The LED constant current drive circuit serves as the boost-type constant current output circuit so that boosting and decompression control can be achieved by controlling the duty ratio of pulsing communication and pulsing closing of a metal oxide semiconductor (MOS) pipe in a constant current chip according to the value of the sampled voltage, and therefore the output current is controlled to a preset value so as to keep constant current output, the LED can be driven to work safely and reliably.
Description
Technical field
The present invention relates to the LED lighting field, relate in particular to a kind of LED constant-current drive circuit and LED lighting device.
Background technology
LED is as new type light source, and it has energy-saving and environmental protection, characteristics efficiently, and technology is ripe and be used as lighting source and be widely used, and various LED drive circuits also occurred thereupon.LED is as the constant current operating load, and because LED self is harsher to the operating voltage requirement, overtension is too low all can cause LED work undesired, so the power supply quality of supply voltage directly affects the reliability of LED.In the dc low-voltage power supply, as lithium battery power supply, lead-acid battery power supply, DC power supply etc., be all to adopt the step-down constant current technology to come driving LED, the advantages such as power consumption is little, efficient is high, the unit power volume is little, lightweight that it has at present.
But the most important condition of this kind voltage-dropping type constant current output circuit work be its input voltage of requirement higher than the voltage of LED lamp group and, when its input voltage lower than the voltage of LED lamp group and the time, the step-down constant-current circuit just can't be exported constant current and guarantee LED constant current work, cause the LED output light flux to reduce, LED can not operate at full capacity, bring serious inconvenience to the user, had limitation.
Summary of the invention
Embodiment of the present invention technical problem to be solved is, provides a kind of booster type LED of constant current output to drive, driving LED work safely and reliably.
In order to solve the problems of the technologies described above, the embodiment of the present invention provides 1, a kind of LED constant-current drive circuit, and load is connected described constant-current drive circuit with LED with power supply, it is characterized in that, described LED constant-current drive circuit comprises:
Be used for to the booster type constant current output circuit of described LED load output constant current;
Be connected with described power supply, LED load and described booster type constant current output circuit, be used for carrying out the power control circuit that power supply protection was controlled and described LED load was carried out to Power supply;
Wherein, described booster type constant current output circuit comprises constant current chip U1, described constant current chip U1 is used for controlling the storage capacitor C5 that is connected with described constant current chip U1 driving power pin and discharges to described LED load supplying, perhaps controls the energy storage inductor L1 discharge that is connected with the output switch pin of described constant current chip U1 and with described power supply stack, described LED load supplying is realized voltage increase and current constant output.
Wherein, also comprise: the ceramic disc capacitor C1 that is connected with the side of the positive electrode of described power supply.
Wherein, the concrete composition of described booster type constant current output circuit comprises:
The power lower margin ground connection of described constant current chip U1;
The job control pin of described constant current chip U1 be connected the power supply input pin and connect, high level is effective, low level is turn-offed;
The operating frequency pin of described constant current chip U1 passes through oscillation resistance R5 and is connected the connection of power supply input pin;
The voltage sample pin of described constant current chip U1 be connected the negative electrode of LED load and connect, and and filter capacitor C3 one end of being connected in the LED load connect, and pass through filter capacitor C4, sampling resistor R6 ground connection respectively;
The direct ground connection of signal lower margin of described constant current chip U1;
The power supply input pin of described constant current chip U1 is connected drain electrode by resistance R 4 and is connected with field effect transistor Q1, and by filter capacitor C2 ground connection;
The anode of the driving power pin of described constant current chip U1 and the negative electrode of rectifier diode D1, the positive pole of described storage capacitor C5, the filter capacitor C3 of described LED load, described LED load, the anodic bonding of voltage stabilizing didoe D2;
The output switch pin of described constant current chip U1 by described energy storage inductor L1 be connected the drain electrode of field effect transistor Q1 and connect.
Wherein, the concrete composition of described power control circuit comprises:
The source electrode of described field effect transistor Q1 be connected positive source and connect, grid is connected collector electrode and is connected with triode Q2, and connects by pull-up resistor R3 and the positive source of being connected;
The base stage of described triode Q2 is connected collector electrode and is connected with triode Q3, and connects by divider resistance R1 and the positive source of being connected, by divider resistance R2 ground connection;
The direct ground connection of described triode Q2 emitter;
Described triode Q3 base stage connects by divider resistance R7 and the voltage stabilizing didoe D2 of being connected, and by divider resistance R8 ground connection, and described triode Q3 emitter is direct ground connection.
Wherein, described booster type constant current output circuit realizes that voltage increase and current constant output is basis:
Described constant current chip U1 adjusts the duty ratio of the field effect transistor of described constant current chip U1 inside according to the sampled voltage on described sampling resistor R6, according to the Duty ratio control output current.
Wherein, described constant current chip U1 specifically compares according to the reference voltage of the sampled voltage on described sampling resistor R6 and described constant current chip U1 inside, control according to comparative result the duty ratio that pulse was opened or closed to internal fet, with the duty ratio of the field effect transistor of adjusting described constant current chip U1 inside.
Wherein, the resistance value of described sampling resistor R6 is adjustable.
Wherein, the described power supply of described power control circuit connection is DC power supply.
Wherein, described field effect transistor Q1 is the P channel MOS tube.
Correspondingly, the embodiment of the present invention also provides a kind of LED lighting device, comprises power supply and LED load, also comprises LED constant-current drive circuit described above.
Implement the embodiment of the present invention, have following beneficial effect:
LED constant-current drive circuit of the present invention is as a kind of constant current output circuit of booster type, can be according to the size of sampled voltage, by the metal-oxide-semiconductor conducting of controlling constant current chip inside, the duty ratio of closing pulse, realization is boosted or step-down is controlled, thereby control output current and arrive set point to keep constant current output, driving LED work safely and reliably.
Description of drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or description of the Prior Art, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is that the structure of the LED lighting device of the embodiment of the present invention forms schematic diagram;
Fig. 2 is that the structure of the LED constant-current drive circuit of the embodiment of the present invention forms schematic diagram;
Fig. 3 is wherein a kind of physical circuit figure of the LED constant-current drive circuit in Fig. 2.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
Seeing also Fig. 1, is that the structure of LED lighting device of the present invention forms schematic diagram.The described LED lighting device of the present embodiment comprises: power supply 1, LED load 2 and LED constant-current drive circuit 3.Described power supply 1 can be the power supplies such as lithium battery power supply commonly used at present, lead-acid battery power supply, DC power supply, and 2 of described LED loads comprise a LED, the LED lamp group that perhaps is made of a plurality of LED.3 of described LED constant-current drive circuits are for providing the booster type LED drive circuit of constant current output.
Concrete, see also Fig. 2, be that the structure of the LED constant-current drive circuit 3 of the embodiment of the present invention forms schematic diagram.Described LED constant-current drive circuit 3 comprises:
Be used for to the booster type constant current output circuit 31 of described LED load 2 output constant currents;
Be connected with described power supply 1, LED load 2 and described booster type constant current output circuit 31, be used for carrying out the power control circuit 32 that power supply protection was controlled and described LED load 2 was carried out to Power supply.
Wherein, described booster type constant current output circuit 31 comprises: constant current chip U1, the energy storage inductor L1 that is connected with the output switch pin of described constant current chip U1, the storage capacitor C5 that is connected with described constant current chip U1 driving power pin, the sampling resistor R6 that is connected with the voltage sample pin of described constant current chip U1, and the rectifier diode D1 that is connected with described constant current chip U1 driving power pin.
Concrete, after switching on power, working power is provided for described booster type constant current output circuit 31 and described LED load 2 through described power control circuit 32.
when described booster type constant current output circuit 31 electric after, the job control pin of described constant current chip U1 i.e. the 2nd pin also is in high level state, so constant current chip U1 starts working, described constant current chip U1, energy storage inductor L1, storage capacitor C5, rectifier diode D1, described LED load 2, sampling resistor R6 forms the job control loop to described LED load 2, the operating current of described LED load 2 is according to the control of described constant current chip U1, correspondingly rely on described storage capacitor C5 to keep, perhaps rely on described energy storage inductor L1 and described power supply 1 jointly to keep, thereby the purpose that realization is boosted, and this booster type constant current output circuit 31 exportable constant current under the control of described constant current chip U1 is described LED load 2 power supplies, described LED load 2 gets electric namely the beginning with constant current work.
Seeing also Fig. 3, is wherein a kind of physical circuit figure of the LED constant-current drive circuit 3 in Fig. 2 again.
As shown in the figure, the physical circuit of described power control circuit 32 composition comprises:
The source electrode of field effect transistor Q1 be connected that power supply 1 is anodal to be connected, grid be connected the collector electrode of triode Q2 and connect, and by pull-up resistor R3 be connected that power supply 1 is anodal to be connected, described field effect transistor Q1 can be the P channel MOS tube; The base stage of described triode Q2 is connected collector electrode and is connected with triode Q3, and by divider resistance R1 be connected that power supply 1 is anodal to be connected, by divider resistance R2 ground connection; The direct ground connection of described triode Q2 emitter; Described triode Q3 base stage is connected with voltage stabilizing didoe D2 by divider resistance R7, and by divider resistance R8 ground connection, described triode Q3 emitter is direct ground connection.
After switching on power, because the anode voltage of described LED load 2 is 0, described voltage stabilizing didoe D2 is in cut-off state, and so described triode Q3 base stage level is 0, and described triode Q3 is in cut-off state.Supply voltage provides high level for described triode Q2 base stage through described divider resistance R1, R2, make described triode Q2 conducting, so described field effect transistor Q1 grid is direct and GND connection by described triode Q2 collector and emitter, be in low level state, therefore described field effect transistor Q1 conducting provides working power to subsequent conditioning circuit.
As shown in the figure, the physical circuit of described booster type constant current output circuit 31 composition comprises:
The power lower margin ground connection of described constant current chip U1; The job control pin of described constant current chip U1 be connected the power supply input pin and connect, high level is effective, low level is turn-offed; The operating frequency pin of described constant current chip U1 passes through oscillation resistance R5 and is connected the connection of power supply input pin; The voltage sample pin of described constant current chip U1 be connected the negative electrode of LED load 2 and connect, and and filter capacitor C3 one end of being connected in LED load 2 connect, and pass through filter capacitor C4, sampling resistor R6 ground connection respectively; The direct ground connection of signal lower margin of described constant current chip U1; The power supply input pin of described constant current chip U1 passes through resistance R 4 and is connected the drain electrode connection of field effect transistor Q1, and passes through filter capacitor C2 ground connection; The anode of the driving power pin of described constant current chip U1 and the negative electrode of rectifier diode D1, the positive pole of storage capacitor C5, the filter capacitor C3 of described LED load 2, described LED load 2, the anodic bonding of described voltage stabilizing didoe D2; The output switch pin of described constant current chip U1 by described energy storage inductor L1 be connected the drain electrode of field effect transistor Q1 and connect.
Described constant current chip U1 inside can comprise a field effect transistor metal-oxide-semiconductor, and described constant current chip U1 adjusts the duty ratio of inner metal-oxide-semiconductor conducting automatically according to the voltage on described sampling resistor R6 (being steady state value).Inner metal-oxide-semiconductor switching frequency is very high, in one-period, when inner metal-oxide-semiconductor open-minded, supply voltage forms path through described energy storage inductor L1, inner metal-oxide-semiconductor and GND, described energy storage inductor L1 storage power, described storage capacitor C5, LED load 2, sampling resistor R6 form the work loop, and the operating current of described LED load 2 relies on described storage capacitor C5 to keep; When inner MOS closes, supply voltage forms the work loop through described energy storage inductor L1, rectifier diode D1, LED load 2, sampling resistor R6, energy and power supply energy in described energy storage inductor L1 superpose, thereby the function that realization is boosted, the operating current of described LED load 2 relies on described power supply 1 and energy storage inductor L1 jointly to keep, until the inner metal-oxide-semiconductor of next cycle is open-minded, thereby the purpose that reaches constant current and boost, namely as long as the resistance value of described sampling resistor R6 is definite, exports so constant current and namely determine.the reference voltage source of the voltage sample pin of described constant current chip U1 and described constant current chip U1 inside forms a comparator, according to sampled voltage (voltage on described sampling resistor R6) and reference voltage relatively after, it is open-minded that described constant current chip U1 internal adjustment is controlled inner metal-oxide-semiconductor, close the duty ratio of pulse, if sampled voltage is greater than reference voltage, illustrate that output current is greater than set point, the duty ratio of so inner metal-oxide-semiconductor conducting just raises, reduce output current to set point, if sampled voltage is less than reference voltage, illustrate that output current is less than set point, the duty ratio of so inner metal-oxide-semiconductor conducting just reduces, increase output current to set point.
In addition, described power control circuit 32 realizes that the process that power supply protection is carried out in described LED load 2 is as follows:
in the course of the work, short circuit appears in the single or multiple LED in described LED load 2, this moment, the circuit output current kept invariable, described booster type constant current output circuit 31 can be adjusted the operating voltage of described LED load 2, until all LED short circuits in described LED load 2, this moment, the circuit output current kept invariable, and just output voltage can be reduced to reference voltage such as the 1.24V of described constant current chip U1, short circuit appears in certain LED in described LED load 2, this moment, the voltage sample pin of described constant current chip U1 was sampled less than voltage, will progressively raise output voltage, this moment, output voltage was higher than described voltage stabilizing didoe D2 operating voltage, described voltage stabilizing didoe D2 punctures conducting, for described triode Q3 base stage provides high level, make described triode Q3 conducting, described triode Q2 base stage is communicated with by described triode Q3 and GND, so described triode Q2 enters off state, described field effect transistor (P channel MOS tube) Q1 grid voltage is drawn high by pull-up resistor R3, described P channel MOS tube Q1 also enters off state, described LED load 2 open circuits are protected, after described LED load 2 open faults are removed, described voltage stabilizing didoe D2 cut-off, described triode Q3 base stage level becomes low, described triode Q3 is turn-offed, described triode Q2 base stage level becomes height by low, and so described triode Q2 reenters conducting state, and described P channel MOS tube Q1 grid voltage is dragged down again, reenter conducting state, for subsequent conditioning circuit continues power supply.
In addition, be coupled to the high frequency clutter in power supply signal in order to guarantee the steady fluctuation of supply voltage and filtering, ceramic disc capacitor C1 can be set at the side of the positive electrode of described power supply 1.
Described employing resistance R 6 can be according to the requirement of LED load 2 in specific product, different resistance values is set, certainly, also can directly described sampling resistor R6 be designed to the adjustable resistance of slide rheostat constant resistance value, so that for different LED loads 2, need not LED constant-current drive circuit 3 is adjusted, the resistance value of directly regulating described sampling resistor R6 gets final product.
Description by above-described embodiment as can be known, the present invention has following beneficial effect:
LED constant-current drive circuit of the present invention is as a kind of constant current output circuit of booster type, can be according to the size of sampled voltage, by the metal-oxide-semiconductor conducting of controlling constant current chip inside, the duty ratio of closing pulse, realization is boosted or step-down is controlled, thereby control output current and arrive set point to keep constant current output, driving LED work safely and reliably.
One of ordinary skill in the art will appreciate that all or part of flow process that realizes in above-described embodiment method, to come the relevant hardware of instruction to complete by computer program, described program can be stored in a computer read/write memory medium, this program can comprise the flow process as the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body (Read-Only Memory, ROM) or random store-memory body (Random Access Memory, RAM) etc.
Above disclosed is only preferred embodiment of the present invention, certainly can not limit with this interest field of the present invention, and the equivalent variations of therefore doing according to claim of the present invention still belongs to the scope that the present invention is contained.
Claims (10)
1. LED constant-current drive circuit, load is connected described constant-current drive circuit with LED with power supply, it is characterized in that, and described LED constant-current drive circuit comprises:
Be used for to the booster type constant current output circuit of described LED load output constant current;
Be connected with described power supply, LED load and described booster type constant current output circuit, be used for carrying out the power control circuit that power supply protection was controlled and described LED load was carried out to Power supply;
Wherein, described booster type constant current output circuit comprises constant current chip U1, described constant current chip U1 is used for controlling the storage capacitor C5 that is connected with described constant current chip U1 driving power pin and discharges to described LED load supplying, perhaps controls the energy storage inductor L1 discharge that is connected with the output switch pin of described constant current chip U1 and with described power supply stack, described LED load supplying is realized voltage increase and current constant output.
2. LED constant-current drive circuit as claimed in claim 1, is characterized in that, also comprises:
The ceramic disc capacitor C1 that is connected with the side of the positive electrode of described power supply.
3. LED constant-current drive circuit as claimed in claim 2, is characterized in that, the concrete composition of described booster type constant current output circuit comprises:
The power lower margin ground connection of described constant current chip U1;
The job control pin of described constant current chip U1 be connected the power supply input pin and connect, high level is effective, low level is turn-offed;
The operating frequency pin of described constant current chip U1 passes through oscillation resistance R5 and is connected the connection of power supply input pin;
The voltage sample pin of described constant current chip U1 be connected the negative electrode of LED load and connect, and and filter capacitor C3 one end of being connected in the LED load connect, and pass through filter capacitor C4, sampling resistor R6 ground connection respectively;
The direct ground connection of signal lower margin of described constant current chip U1;
The power supply input pin of described constant current chip U1 is connected drain electrode by resistance R 4 and is connected with field effect transistor Q1, and by filter capacitor C2 ground connection;
The anode of the driving power pin of described constant current chip U1 and the negative electrode of rectifier diode D1, the positive pole of described storage capacitor C5, the filter capacitor C3 of described LED load, described LED load, the anodic bonding of voltage stabilizing didoe D2;
The output switch pin of described constant current chip U1 by described energy storage inductor L1 be connected the drain electrode of field effect transistor Q1 and connect.
4. LED constant-current drive circuit as claimed in claim 3, is characterized in that, the concrete composition of described power control circuit comprises:
The source electrode of described field effect transistor Q1 be connected positive source and connect, grid is connected collector electrode and is connected with triode Q2, and connects by pull-up resistor R3 and the positive source of being connected;
The base stage of described triode Q2 is connected collector electrode and is connected with triode Q3, and connects by divider resistance R1 and the positive source of being connected, by divider resistance R2 ground connection;
The direct ground connection of described triode Q2 emitter;
Described triode Q3 base stage connects by divider resistance R7 and the voltage stabilizing didoe D2 of being connected, and by divider resistance R8 ground connection, and described triode Q3 emitter is direct ground connection.
5. LED constant-current drive circuit as claimed in claim 4, is characterized in that, described booster type constant current output circuit realizes that voltage increase and current constant output is basis:
Described constant current chip U1 adjusts the duty ratio of the field effect transistor of described constant current chip U1 inside according to the sampled voltage on described sampling resistor R6, according to the Duty ratio control output current.
6. LED constant-current drive circuit as claimed in claim 5, it is characterized in that, described constant current chip U1 specifically compares according to the reference voltage of the sampled voltage on described sampling resistor R6 and described constant current chip U1 inside, control according to comparative result the duty ratio that pulse was opened or closed to internal fet, with the duty ratio of the field effect transistor of adjusting described constant current chip U1 inside.
7. LED constant-current drive circuit as claimed in claim 6, is characterized in that, the resistance value of described sampling resistor R6 is adjustable.
8. LED constant-current drive circuit as claimed in claim 1, is characterized in that, the described power supply that described power control circuit connects is DC power supply.
9. LED constant-current drive circuit as claimed in claim 3, is characterized in that, described field effect transistor Q1 is the P channel MOS tube.
10. a LED lighting device, comprise power supply and LED load, it is characterized in that, also comprises LED constant-current drive circuit as described in claim 1 to 9 any one.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110414037.5A CN103167664B (en) | 2011-12-13 | 2011-12-13 | A kind of constant current driver circuit for LED and LED light device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110414037.5A CN103167664B (en) | 2011-12-13 | 2011-12-13 | A kind of constant current driver circuit for LED and LED light device |
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| CN103167664A true CN103167664A (en) | 2013-06-19 |
| CN103167664B CN103167664B (en) | 2016-09-28 |
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| CN104659755A (en) * | 2013-11-21 | 2015-05-27 | 海洋王（东莞）照明科技有限公司 | LED constant current driving protection circuit and lamp |
| CN104918391A (en) * | 2015-07-06 | 2015-09-16 | 高志敏 | LED constant-voltage and constant-current driving power supply |
| WO2017041354A1 (en) * | 2015-09-11 | 2017-03-16 | 深圳市华星光电技术有限公司 | Pulse width modulation circuit |
| CN107197569A (en) * | 2017-07-25 | 2017-09-22 | 合肥惠科金扬科技有限公司 | A kind of LED backlight Drive Protecting Circuit and display device |
| CN111479362A (en) * | 2020-04-09 | 2020-07-31 | 中山市烨隆照明有限公司 | L ED constant voltage constant current energy-saving driver |
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| Publication number | Publication date |
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| CN103167664B (en) | 2016-09-28 |
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