CN204119612U

CN204119612U - 10w led drive circuit

Info

Publication number: CN204119612U
Application number: CN201420565391.7U
Authority: CN
Inventors: 戴璐
Original assignee: Dongguan University of Technology
Current assignee: Dongguan University of Technology
Priority date: 2014-09-29
Filing date: 2014-09-29
Publication date: 2015-01-21
Anticipated expiration: 2024-09-29

Abstract

The utility model discloses a 10W LED drive circuit relates to the technical field that is used for general electric light source. The driving circuit comprises resistors R1-R8, capacitors C2-C10, a diode D1, a rectifier bridge D2, diodes D3-D4, transformers T1-T2, an inductor L1, an integrated control chip RM6203, an optical coupler U2 and a thyristor Q1. The driving circuit uses the RM6203 integrated control chip and designs a proper peripheral circuit connected with the driving circuit, so that when an input power supply is 90V-264V, the output voltage is still kept within the range of 5V +/-5%, the constant voltage and constant current effects are good, the circuit is simple in structure, small in size, low in manufacturing cost and long in service life, and the driving circuit is very suitable for a low-power LED.

Description

10W LED drive circuit

Technical field

The utility model relates to the device technique field for general electric light source, particularly relates to a kind of 10W LED drive circuit.

Background technology

LED drive power is that power supply supply is converted to specific electric current and voltage with the power supply changeover device of driving LED luminescence, under normal circumstances: the input of LED drive power comprises high pressure industrial frequency AC (i.e. civil power), low-voltage direct, high voltage direct current, low-voltage high-frequency interchange (output as electronic transformer) etc.

By type of drive

(1) electric current that constant current mode: a, constant-current drive circuit export is constant, and the direct voltage exported changes within the specific limits along with varying in size of load resistance, and load resistance is little, and output voltage is just low, and load resistance is larger, and output voltage is also higher; Load short circuits is not afraid of by b, constant-current circuit, but forbids load to be opened a way completely.C, constant-current drive circuit driving LED are ideal, but price is higher comparatively speaking.D, should note used maximumly bearing electric current and magnitude of voltage, which limit the usefulness the usage quantity of LED;

(2) type voltage regulation: a, after the parameters in voltage stabilizing circuit is determined, the voltage of output is fixing, and the electric current exported changes along with the increase and decrease of load; B, voltage stabilizing circuit are not afraid of load open circuit, but forbid load dead short circuit.C, with voltage stabilizing drive circuit driving LED, often to need to add that suitable resistive square can make often to go here and there LED display brightness average for string; The voltage variations affect that d, brightness can come by rectification.

The structure of existing LED drive circuit is comparatively complicated, and manufacturing cost is high, and constant voltage, constant current effect are bad, causes the drive circuit life-span lower.

Utility model content

Technical problem to be solved in the utility model is to provide a kind of 10W LED drive circuit, and described drive circuit has constant voltage, constant current is effective, and circuit structure is simple, and volume is little, low cost of manufacture, long service life, is applicable to very much the feature of low-power LED.

For solving the problems of the technologies described above, technical solution adopted in the utility model is: a kind of 10W LED drive circuit, it is characterized in that: the power input of described drive circuit connects civil power, civil power is through transformer T1 and the laggard line output of rectifier bridge D2 rectification, an output head grounding of rectifier bridge D2, another output first via of rectifier bridge D2 is through electric capacity C2 ground connection, and the second tunnel connects the negative pole on the former limit of transformer T2 first; The positive pole on the former limit of transformer T2 first is divided into two-way through diode D1, and the first via is connected with the negative pole on the former limit of transformer T2 first through electric capacity C3, and the second tunnel is connected with the negative pole on the former limit of transformer T2 first through resistance R2; The minus earth on the former limit of transformer T2 second, the positive pole on the former limit of transformer T2 second is divided into two-way, the first via is connected with the 2nd pin of integrating control chip U1 through diode D3, one end ground connection of electric capacity C4,2nd pin of another termination integrating control chip U1, the second tunnel is connected with 7 pin of integrating control chip U1 and 8 pin respectively; 1 pin of integrating control chip U1 connects the negative pole on the former limit of transformer T2 first through resistance R1; The 3 pin ground connection of integrating control chip U1,4 foot meridian capacitor C5 ground connection, 6 pin are through resistance R3 ground connection; 5 pin of integrating control chip U1 are divided into two-way, and wherein the first via is through electric capacity C6 ground connection, and the second tunnel is connected with an output of optocoupler U2, another output head grounding of optocoupler U2; The positive pole of transformer T2 secondary is connected with an output of described drive circuit through diode D4, inductance L 1 successively, the negative pole one tunnel ground connection of transformer T2 secondary, and another road is connected with the negative pole on the former limit of the transformer T2 first via through electric capacity C10; The one terminating diode D4 of electric capacity C7 and the node of inductance L 1, the negative pole of another termination transformer T2 secondary; Electric capacity C8 is connected in parallel on the output of described drive circuit; An input of optocoupler U1 connects the node of diode D4 and inductance L 1 through resistance R4, another input of optocoupler U1 connects the node of diode D4 and inductance L 1 through resistance R5; The plus earth of thyristor Q1, the negative electrode of thyristor Q1 is divided into two-way, and the first via is connected with an input of optocoupler U1, and the second tunnel connects the cathode output end of described drive circuit successively through resistance R6, electric capacity C9 and resistance R7; One end ground connection of resistance R8, the other end is divided into two-way, and the first via connects the control pole of thyristor Q1, and the second tunnel connects the node of electric capacity C9 and resistance R7.

Further technical scheme is: described integrating control chip U1 is RM6203.

Further technical scheme is: the power input of described drive circuit is provided with fuse F1.

The beneficial effect adopting technique scheme to produce is: described drive circuit is by using RM6203 integrating control chip, and design suitable connected peripheral circuit, make input power when 90V ~ 264V, still keep output voltage in the scope of 5V ± 5 ﹪, constant voltage, constant current are effective, and circuit structure is simple, volume is little, low cost of manufacture, long service life, is applicable to the feature of low-power LED very much.

Accompanying drawing explanation

Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.

Fig. 1 is circuit theory diagrams of the present utility model.

Embodiment

Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only a part of embodiment of the present utility model, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.

Set forth a lot of detail in the following description so that fully understand the utility model, but the utility model can also adopt other to be different from alternate manner described here to implement, those skilled in the art can when doing similar popularization without prejudice to when the utility model intension, and therefore the utility model is by the restriction of following public specific embodiment.

As shown in Figure 1, the utility model discloses a kind of 10W LED drive circuit, the power input of described drive circuit connects civil power, in addition, the power input of described drive circuit is provided with fuse F1, prevents the excessive damage circuit of electric current, civil power is through transformer T1 and the laggard line output of rectifier bridge D2 rectification, an output head grounding of rectifier bridge D2, another output first via of rectifier bridge D2 is through electric capacity C2 ground connection, and the second tunnel connects the negative pole on the former limit of transformer T2 first; The positive pole on the former limit of transformer T2 first is divided into two-way through diode D1, and the first via is connected with the negative pole on the former limit of transformer T2 first through electric capacity C3, and the second tunnel is connected with the negative pole on the former limit of transformer T2 first through resistance R2; The minus earth on the former limit of transformer T2 second, the positive pole on the former limit of transformer T2 second is divided into two-way, the first via is connected with the 2nd pin of integrating control chip U1 through diode D3, one end ground connection of electric capacity C4,2nd pin of another termination integrating control chip U1, second tunnel is connected with 7 pin of integrating control chip U1 and 8 pin respectively, and described integrating control chip U1 uses RM6203 type control chip in this application;

1 pin of integrating control chip U1 connects the negative pole on the former limit of transformer T2 first through resistance R1; The 3 pin ground connection of integrating control chip U1,4 foot meridian capacitor C5 ground connection, 6 pin are through resistance R3 ground connection; 5 pin of integrating control chip U1 are divided into two-way, and wherein the first via is through electric capacity C6 ground connection, and the second tunnel is connected with an output of optocoupler U2, another output head grounding of optocoupler U2; The positive pole of transformer T2 secondary is connected with an output of described drive circuit through diode D4, inductance L 1 successively, the negative pole one tunnel ground connection of transformer T2 secondary, and another road is connected with the negative pole on the former limit of the transformer T2 first via through electric capacity C10; The one terminating diode D4 of electric capacity C7 and the node of inductance L 1, the negative pole of another termination transformer T2 secondary; Electric capacity C8 is connected in parallel on the output of described drive circuit; An input of optocoupler U1 connects the node of diode D4 and inductance L 1 through resistance R4, another input of optocoupler U1 connects the node of diode D4 and inductance L 1 through resistance R5; The plus earth of thyristor Q1, the negative electrode of thyristor Q1 is divided into two-way, and the first via is connected with an input of optocoupler U1, and the second tunnel connects the cathode output end of described drive circuit successively through resistance R6, electric capacity C9 and resistance R7; One end ground connection of resistance R8, the other end is divided into two-way, and the first via connects the control pole of thyristor Q1, and the second tunnel connects the node of electric capacity C9 and resistance R7.

Operation principle: when input voltage reaches the starting resistor of integrating control chip U1, integrating control chip U1 exports the voltage of a constant current, and by connected peripheral components, voltage is stablized, control the conducting of thyristor Q1, the former limit of transformer T2 is made to obtain stable voltage input, thus making the secondary of transformer T2 sense stable voltage, the electric current of the power output end stable output of described drive circuit then, for driving low-power LED.

To sum up, described drive circuit is by using RM6203 integrating control chip, and design suitable connected peripheral circuit, make input power when 90V ~ 264V, still keep output voltage in the scope of 5V ± 5 ﹪, constant voltage, constant current are effective, and circuit structure is simple, volume is little, low cost of manufacture, long service life, is applicable to the feature of low-power LED very much.

Claims

1. A 10W LED drive circuit, characterized in that: the power input terminal of the drive circuit is connected to the mains, the mains is output after being rectified by the transformer T1 and the rectifier bridge D2, an output terminal of the rectifier bridge D2 is grounded, and the rectifier bridge The first path of the other output end of D2 is grounded through the capacitor C2, and the second path is connected to the negative pole of the first primary side of the transformer T2; the positive pole of the first primary side of the transformer T2 is divided into two paths through the diode D1, and the first path is connected to the capacitor C3 and The negative pole of the first primary side of the transformer T2 is connected, and the second path is connected to the negative pole of the first primary side of the transformer T2 through the resistor R2; the negative pole of the second primary side of the transformer T2 is grounded, and the positive pole of the second primary side of the transformer T2 is divided into two circuits, The first path is connected to the 2nd pin of the integrated control chip U1 through the diode D3, one end of the capacitor C4 is grounded, the other end is connected to the 2nd pin of the integrated control chip U1, and the second path is respectively connected to the 7th pin and 8th pin of the integrated control chip U1 Connection; pin 1 of the integrated control chip U1 is connected to the negative pole of the first primary side of the transformer T2 through the resistor R1; pin 3 of the integrated control chip U1 is grounded, pin 4 is grounded through the capacitor C5, pin 6 is grounded through the resistor R3; the integrated control chip U1 Pin 5 is divided into two paths, the first path is grounded through capacitor C6, the second path is connected to one output end of optocoupler U2, and the other output end of optocoupler U2 is grounded; the anode of the secondary side of transformer T2 passes through diode D4, The inductance L1 is connected to an output terminal of the drive circuit, the negative pole of the secondary side of the transformer T2 is grounded one way, and the other path is connected to the negative pole of the first primary side of the transformer T2 through the capacitor C10; one end of the capacitor C7 is connected to the diode D4 and the inductor L1 The other end is connected to the negative pole of the secondary side of the transformer T2; the capacitor C8 is connected in parallel to the output end of the drive circuit; one input end of the optocoupler U1 is connected to the node of the diode D4 and the inductor L1 through the resistor R4, and the other end of the optocoupler U1 One input terminal is connected to the junction of diode D4 and inductor L1 through resistor R5; the anode of thyristor Q1 is grounded, and the cathode of thyristor Q1 is divided into two circuits. R6, capacitor C9 and resistor R7 are connected to the positive output terminal of the drive circuit; one end of resistor R8 is grounded, and the other end is divided into two circuits, the first circuit is connected to the control pole of thyristor Q1, and the second circuit is connected to capacitor C9 and resistor R7. Node.

2. The 10W LED drive circuit according to claim 1, characterized in that: said integrated control chip U1 is RM6203.

3. The 10W LED drive circuit according to claim 1, characterized in that: the power input end of the drive circuit is provided with a fuse F1.