CN201039531Y

CN201039531Y - LED transformation drive circuit

Info

Publication number: CN201039531Y
Application number: CNU2007200505764U
Authority: CN
Inventors: 谷岩柏
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-04-20
Filing date: 2007-04-20
Publication date: 2008-03-19
Anticipated expiration: 2017-04-20

Abstract

The utility model relates to an LED transforming driving circuit used for driving an LED lamp string. The utility model aims at providing an LED transforming driving circuit which is characterized in that, the circuit is suitable for the electric property of the LED, and can not only reduce and stabilize voltage of input AC voltage but also carry out eight-section circulating flashing control to four circuits of LED lamp string. The LED transforming driving circuit comprises an AC/DC rectifying circuit, a filtering circuit, an outputting rectifying filtering circuit, an LED flashing controlling circuit, a clamping circuit, a transformer loop, an IC controlling circuit, a feeding-back circuit and an over-voltage protecting circuit, wherein, the input terminal of the clamping circuit is connected with the elementary winding of the transformer, and the output terminal is connected with the output terminal of the filtering circuit. The input terminal of the outputting rectifying filtering circuit is connected with the second winding of the transformer, and the output terminal is connected with the LED flashing controlling circuit. The utility model has the advantage of safe, reliable and convenient sectional control, and also is suitable for being used in various LED circuits.

Description

LED transformation drive circuit

[technical field]

The utility model relates to a kind of circuit, is specifically related to a kind of LED transformation drive circuit that is used for driving LED lamp string.

[background technology]

In the existing technology, the LED lamp series controller always adopts to exchange 110V or 230V input, be output as the direct voltage of 154V or 310V, this voltage is dangerous voltage, the people is once the danger that touches electric shock, and to adopt the Color lamp string of this controller all be series connection, in case a bulb burns out, whole string color lamp all can extinguish, and influences the fail safe of useful life and use.

[summary of the invention]

The purpose of this utility model is: a kind of suitable LED electrical characteristic is provided, can carries out lowering and stabilizing blood pressure, constant current control, improve stability input ac voltage, high reliability and fail safe, the LED transformation drive circuit that can carry out eight sections circulation flicker controls again to four paths of LEDs lamp strings.

The technical solution adopted in the utility model is: a kind of LED transformation drive circuit comprises the AC/DC rectification circuit, filter circuit, output rectifier and filter; the LED control circuit that glimmers, clamp circuit, transformer circuit; IC control circuit, feedback loop and overvoltage crowbar.Wherein: described AC/DC rectification circuit input end is used to connect AC power; output is connected with described filter circuit input; described filter circuit output connects the elementary winding of transformer; described clamp circuit input links to each other with the primary winding; output is connected with the output of filter circuit; described feedback loop input is connected with overvoltage crowbar; output is connected to control IC; described overvoltage crowbar is connected with feedback circuit; described output rectifier and filter input is connected with the secondary of transformer; output is connected to LED flicker control circuit, and described LED flicker control circuit output and load LED lamp polyphone connect.

Above-mentioned LED transformation drive circuit, described AC/DC rectification circuit is full-bridge rectification (BR1), input is used to connect AC power, described filter circuit is filter capacitor (HVDC), described filter capacitor cross-over connection is in the output of described full-bridge rectification, described clamp circuit comprises that peak voltage absorbs circuit and a quick conducting diode, the drain electrode of described quick conducting diode "+" termination IC, the described point of "-" termination meets the input of voltage absorpting circuit, described peak voltage absorbs the output that circuit input end connects quick conducting diode, the output of output termination filter circuit.

Above-mentioned LED transformation drive circuit; described IC control circuit is TNY255PN/TNY268PN; the DIP8 encapsulation; PIN5 connects the elementary winding of transformer; PIN1 connects bypass/multi-functional pin electric capacity of 104/50V; PIN4 connects the output of described feedback loop; all the other PIN pin meet GND; described feedback loop input connects with regard to the input of overvoltage crowbar; the PIN4 of output termination IC; the output of described overvoltage crowbar input termination output rectifier and filter; output termination GND; described output rectifier and filter input termination Secondary winding of transformer; output termination LED flicker control circuit; described transformer circuit iron core is EE16; the sense value is 545UH/940UH; PIN1; PIN4 is elementary winding, and PIN5, PIN8 are secondary winding; described LED flicker control circuit input comprises three branch roads; one the tunnel is directly inserted by output rectifier and filter, and as public "+" of load circuit, the second tunnel is also inserted by output rectifier and filter; to color light control IC power supply, Third Road provides the pulse signal of cycle variation for color light control IC by AC power input L/N end through dropping resistor through the resistance step-down.

Above-mentioned LED transformation drive circuit; described AC power is carried out the filtering of π type after full-bridge rectification; described filtered direct current inserts through the PIN1 of transformer; export to the drain electrode power supply of ICTNY255PN/TNY268PN by PIN4; connect peak voltage between the PIN1 of described drain electrode and transformer and absorb circuit protection IC; the PIN1 of described IC connects bypass/multi-functional pin electric capacity; PIN4 connects the collector electrode of the reception triode of feedback loop photoelectrical coupler; the secondary output rectifier and filter that connects of described transformer; described overvoltage crowbar connects the output of output rectifier and filter; output voltage is taken a sample and by "+" end input of the emitting diode of feedback loop photoelectrical coupler, the control IC PIN3 of described LED flicker control circuit, PIN4; PIN5; PIN6 connects four tunnel control output, and the G utmost point of four MOSFET meets control IC PIN3, PIN4; PIN5; PIN6, the S utmost point meets GND, and the D utmost point connects load LED lamp string.

Because the technique scheme utilization, the utility model has following advantage compared with prior art:

The of the present utility model initiative combines electronic transformer and traditional color lamp controller, the output voltage that makes complete machine is a safe voltage, change traditional color lamp controller and be operated in high-tension pattern, safe in utilization, the connection mode that the utility model has also been initiated the Color lamp string string and mixed, having changed traditional Color lamp string all is the single mode that is connected in series, and causes extinguishing of a whole cluster of lamps, ornamental in case a lamp has been broken, thereby effectively raise the fail safe of complete machine, reliability and life-span.

The utlity model has safe and reliable, as to be convenient to segmentation control control advantage, be applicable in the various led circuits.

[description of drawings]

Accompanying drawing 1 is a schematic block circuit diagram of the present utility model;

Accompanying drawing 2 is circuit theory diagrams of the present utility model.

[embodiment]

Below in conjunction with drawings and Examples the utility model is further described:

Embodiment one: shown in accompanying drawing 1 and accompanying drawing 2; as shown in Figure 1, the utility model comprises AC/DC rectification circuit 1, filter circuit 2, clamp circuit 3, transformer circuit 4, IC control circuit 5, feedback loop 6, overvoltage crowbar 7, output rectifier and filter 8, the LED control circuit 9 that glimmers.

The input of AC/DC rectification circuit 1:AC/DC power supply is after by fuse resistance F1 importing full-bridge rectifier BRI, become the AC rectification power supply of DC composition.

The power supply of filter circuit 2:DC composition, the ripple rate height of this moment is so install the ripple rate mitigation of II line filter with direct current output additional.

Clamp circuit 3: adopt quick conducting diode UF4007, the leakage inductance of IC drain electrode is turn-offed peak voltage be conducting to transient state supression diode P6KE200A fast, this spike leakage inductance voltage is sponged, ensure the normal trouble free service of IC.

Transformer circuit 4: the transformer circuit iron core is EE16, and the sense value is 545UH/940UH, and PIN1, PIN4 are elementary winding, and PIN5, PIN8 are secondary winding, and PIN1 is "+" end of the different name termination C2 of elementary winding.PIN4 is the drain electrode of the termination IC of the same name of elementary winding, and PIN5 is the different name termination GND of secondary winding, and PIN8 is "+" end of the termination D3 of the same name of secondary winding.

IC control circuit 5: the IC chip that uses is TNY255PN/TNY268PN, PIN1 is bypass/multi-functional (BP/M) pin, an external bypass capacitors is connected to the operating voltage that this pin is used to generate inner 5.85V, also be to set, select the current limitation value according to the numerical value of employed electric capacity as outside current-limiting points.PIN4 is for enabling pin, the switch of input enable signal control MOSMET, and when the electric current of pulling out of pin from then on during greater than certain threshold current, MOSFET will be turned off, and when the electric current of pulling out of this pin during less than certain threshold current, MOSFET will be opened again.PIN5 is a drain lead, and the drain electrode tie point of internal power MOSFET provides the internal work electric current when unlatching and steady operation.PIN2, PIN3, PIN7, PIN8 are connected internally to the source electrode of power MOSFET, are used for the reference point of high-power return contact and control circuit.

Feedback loop 6: by a photoelectrical coupler EL817C, the PIN4 that the transistorized collector electrode of light lotus root is connected to IC TNY255PN/TNY268PN enables pin, emitter is connected to source lead, light lotus root LED and voltage stabilizing didoe Z1 are connected on the two ends of output dc voltage, when output voltage exceeds target voltage stabilizing value, light lotus root diode begins conducting, and the PIN4 pin is undercuted.

Overvoltage crowbar 7: when being output as zero load, voltage-stabiliser tube Z1 in the scope of the voltage stabilizing value of Z1, guarantees the safety of complete machine with output voltage stabilization.

Output rectifier and filter 8: T1 level of transformer is output as high-frequency ac voltage, and this high frequency voltage carries out halfwave rectifier through rectifier diode SB100, and this direct voltage ripple coefficient is bigger, carries out filtering through C6 again, makes it to be output as level and smooth direct voltage.

The LED control circuit 9 that glimmers: this partial circuit comprises a color light control IC U3, the PIN1 of described U3 connects the synchronous AC signal, for the inside concussion provides pulse signal, PIN2 connects the conversion switch and receives GND, PIN3, PIN4, PIN5, PIN6 connect the grid of 4 MOSFET 2N7000, and the source electrode of 4 MOSFET2N7000 meets GND, the drain electrode of 4 MOSFET 2N7000 connects LED lamp string respectively, as the PIN3 of U3, PIN4, PIN5, arbitrary pin of PIN6 high level occurs and is, corresponding M OSFET is that MOSFET will end with conducting when low level occurring, and the PIN9 of described U3 connects switch, the PIN10 pin provides operating voltage by dropping resistor R7 and integrating capacitor C7 to U3, and described switch is the change over switch of eight sections circulation flickers of LED lamp string control.

The utility model output voltage is the direct voltage that is lower than 36V; safe in utilization; and the utlity model has short-circuit protection function; in case short-circuit state appears in output; internal circuit turn-offs output immediately; after treating that short trouble is got rid of, complete machine recovers operate as normal immediately, thereby the security reliability of complete machine is provided.

Claims

1. LED transformation drive circuit; comprise the AC/DC rectification circuit; filter circuit; output rectifier and filter; the LED control circuit that glimmers; it is characterized in that: it also comprises clamp circuit; transformer circuit; the IC control circuit; feedback loop; overvoltage crowbar; wherein: described AC/DC rectification circuit input end is used to connect AC power, and output is connected with described filter circuit input, and described filter circuit output connects the elementary winding of transformer; described clamp circuit input links to each other with the primary winding; output is connected with the output of filter circuit, and described feedback loop input is connected with overvoltage crowbar, and output is connected to control IC; described overvoltage crowbar is connected with feedback circuit; described output rectifier and filter input is connected with the secondary of transformer, and output is connected to LED flicker control circuit, and described LED flicker control circuit output and load LED lamp polyphone connect.

2. as claims 1 described LED transformation drive circuit, it is characterized in that: described clamp circuit comprises that peak voltage absorbs circuit and a quick conducting diode, the drain electrode of described quick conducting diode "+" termination IC, the described point of "-" termination meets the input of voltage absorpting circuit.

3. as claims 2 described LED transformation drive circuits, it is characterized in that: described peak voltage absorbs the output that circuit input end connects quick conducting diode, the output of output termination filter circuit.

4. as claims 2 described LED transformation drive circuits, it is characterized in that: described IC control circuit is TNY255PN/TNY268PN, the DIP8 encapsulation, PIN5 connects the elementary winding of transformer, PIN1 connects bypass/multi-functional pin electric capacity of 104/50V, PIN4 connects the output of described feedback loop, and all the other PIN pin meet GND.

5. as claims 1 described LED transformation drive circuit, it is characterized in that: described feedback loop input connects with regard to the input of overvoltage crowbar, the PIN4 of output termination IC.

6. as claims 1 described LED transformation drive circuit, it is characterized in that: the output of described overvoltage crowbar input termination output rectifier and filter, output termination GND.

7. as claims 1 described LED transformation drive circuit, it is characterized in that: described output rectifier and filter input termination Secondary winding of transformer, output termination LED flicker control circuit.

8. as claims 7 described LED transformation drive circuits, it is characterized in that: described transformer circuit iron core is EE16, and the sense value is 545UH/940UH, and PIN1, PIN4 are elementary winding, and PIN5, PIN8 are secondary winding.

9. as claims 1 described LED transformation drive circuit, it is characterized in that: described LED flicker control circuit input comprises three branch roads, one the tunnel is directly inserted by output rectifier and filter, public "+" as load circuit, the second the tunnel is also inserted by output rectifier and filter, to color light control IC power supply, Third Road provides the pulse signal of cycle variation for color light control IC by AC power input L/N end through dropping resistor through the resistance step-down.

10. as the arbitrary described LED transformation drive circuit of claims 1-9; it is characterized in that: described AC power is carried out the filtering of π type after full-bridge rectification; described filtered direct current inserts through the PIN1 of transformer; export to the drain electrode power supply of IC TNY255PN/TNY268PN by PIN4; connect peak voltage between the PIN1 of described drain electrode and transformer and absorb circuit protection IC; the PIN1 of described IC connects bypass/multi-functional pin electric capacity; PIN4 connects the collector electrode of the reception triode of feedback loop photoelectrical coupler; the secondary output rectifier and filter that connects of described transformer; described overvoltage crowbar connects the output of output rectifier and filter; output voltage is taken a sample and by "+" end input of the emitting diode of feedback loop photoelectrical coupler, the control IC PIN3 of described LED flicker control circuit, PIN4; PIN5; PIN6 connects four tunnel control output, and the G utmost point of four MOSFET meets control IC PIN3, PIN4; PIN5; PIN6, the S utmost point meets GND, and the D utmost point connects load LED lamp string.