CN108112132A - A kind of Width funtion inputs LED lamp driver that can be with an automatic light meter - Google Patents

Abstract

A kind of Width funtion inputs LED lamp driver that can be with an automatic light meter, a kind of Width funtion input energy LED lamp driver with an automatic light meter is disclosed, when this driver applications are to lamps and lanterns, when can periodically LED light be arrived in the second half of the night, it is automatic to carry out Dimming operation, the operating voltage at LED array both ends is reduced, reduces the power of headlamp, the power consumption of headlamp is saved, and headlamp is made effectively to avoid harm of the circuit high voltage to headlamp after midnight.

Description

A kind of Width funtion inputs LED lamp driver that can be with an automatic light meter

Technical field

The present invention relates to the LED lamp drivers that a kind of input of Width funtion can be with an automatic light meter.

Background technology

In the residential area in cities and towns, the illumination of the headlamp and cordon traffic road of the stairs port passage of residential quarters Lamp, it is daily after midnight zero when after, the pedestrian on stairs port is rare, and cordon traffic road vehicle and pedestrian also locate In rare state, headlamp is allowed to continue vehement bright work, it is clear that It is not necessary to, one wastes electric energy；Two carry out line electricity after midnight Superelevation is pressed, endangers the safety of headlamp.

The content of the invention

A kind of Width funtion of the present invention inputs LED lamp driver that can be with an automatic light meter, and it is automatic to disclose a kind of Width funtion input energy The LED light of light modulation when this lamp can periodically arrive LED light in the second half of the night, carries out Dimming operation, reduces LED times automatically The operating voltage at both ends is arranged, the power of headlamp is reduced, saves the power consumption of headlamp, and it is later half that headlamp is made effectively to avoid Harm of the night circuit high voltage to headlamp.

A kind of Width funtion inputs LED lamp driver that can be with an automatic light meter, and circuit is formed by ac filter circuit, rectifier Circuit, circuit of power factor correction, timer circuit, PWM modulation circuit, LED lighting board driving circuit composition.

Description of the drawings

Fig. 1 is a kind of circuit diagram for the LED lamp driver that Width funtion input can be with an automatic light meter.

Specific embodiment

As shown in Figure 1, E is fuse, overload protective function is played in circuit；B is the thermistor of negative temperature coefficient, in electricity Play the role of anti-shove in road；C1, C2, L1, L2, W form alternating current filter circuit, and C1, C2 are safety capacitance；L1, L2 are poor Mould inductance；W is common mode inductance, and filter circuit is given the various disturbance wave eliminatings of alternating current with good 220V alternating currents whole Flow device circuit.

As shown in Figure 1, IC1 is single phase bridge type rectifier circu, alternating current can be become the direct current of pulsation.C3、C4、C5、 D1, D2, D3 and R1 form circuit of power factor correction.The Rectified alternating current exported by rectifier, voltage is continuous and electric current does not connect Continuous, harmonic distortion is very big, and power factor is very low, affects the utilization rate of electric energy.After introducing circuit of power factor correction, school is utilized Power factor can be increased to more than 0.90 by the function of positive circuit.Specific implementation is that circuit of power factor correction is balance half Another arm of one arm of bridge compensation circuit, C3 and D1 composition half-bridges, C4 and D3 composition half-bridges, D2 and R1 composition charging connection electricity Road, and R1 has surge buffering and current-limiting function, is compensated using Fill valley principle.Filter capacitor C3 and C4 are in series, electricity Voltage highest in appearance is charged to the half (V of input voltage_AC/ 2), once line drop is to V_ACLess than/2, diode D1 and D3 are just It can be forward biased, in this way, C3 and C4 is made to start parallel discharge.After this circuit, the power factor of system can reach More than 0.90.

As shown in Figure 1, IC2 and peripheral circuit composition timer circuit, R2 is current-limiting resistance, circuit of power factor correction The high voltage of output reduces several volts, and the filter circuit being then made of C7, C8 and D5, regulator circuit are voltage stabilization at some Value supply next stage circuit.IC2 is the IC chip of model C D4060, and C9, R3 are electrifying self-resetting circuits, when IC2 obtains power supply wink Between, C9, R3 input a positive pulse signal to 12 feet of IC2, act on the starting of oscillation of IC2 internal circuits and work, at this point, 3 feet of IC2 Low level voltage signal is exported, the triode T1 of positive-negative-positive is driven to become turning on from ending, relay J is attracted, normally opened contact J Capacitance C6 circuits are connected, the filter function of output driving circuit is increased, improves the operating current of LED array, LED array is made to work In vehement bright operating mode；The time setting constant of external capacitance C10, R4 the composition timer of 9,10 feet of IC2, selection are suitable Parameter, you can meet required timing.L4 is antisurge inductance, and protection IC2 is safe.D6 is rectifier diode, when IC2's When timing is count down to, 3 feet of IC2 become high level output from low level, act on two circuits：One is to make triode T1 Become ending from conducting, relay J follows tripping, cuts off C6 circuits, reduces the filter capacity of output circuit, LED array work In the operating mode for reducing by about more than 20% power；Two functions are 11 feet that high level signal is transported to IC2 by diode D6, IC2 internal oscillator circuit failure of oscillations are acted on, and this state maintains down always, until working power is switched off.

As shown in Figure 1, IC3 and peripheral circuit composition pulse-width modulation circuit (abbreviation PWM), IC3 is model PT4107 cores Piece, the current sample input circuit of the external resistance R9 composition LED array of 2 feet, selects suitable resistance value, can meet institute The operating current of the LED array needed, the external field-effect tube T2 of 8 feet export different duty voltage signal control in a manner of PWM modulation Make the operating current of LED array.Field-effect tube T2 is connected to D4, L, filter capacitor C6 and C12 and LED array, wherein L It is energy storage inductor, D4 is fast recovery diode, and the two forms freewheeling circuit, i.e., when IC2 exports low level, field-effect tube T2 Cut-off, LED array will lack driving current, at this point, being supplied to LED array operating current by freewheeling circuit, maintain LED array work Make the continuity of electric current.

PT4107 is the controller device that a kind of high pressure buck constant LED current is adjusted, and input voltage is either 24 ~450VDC or alternating current 220V AC can effectively drive highlighted LED array to work normally.When driving power is exchange When electric, alternating current becomes the direct current of pulsation after bridge rectifier, using circuit of power factor correction, output The direct current of about 310V is conveyed to PT4107, driving LED array work；When driving power is direct current, led to directly using inductance Flow resistance exchanges principle, and DC power supply can effectively be transported to PT4107, so as to which LED array be driven to work.

Claims (1)

1. the LED lamp driver that a kind of Width funtion input can be with an automatic light meter, circuit composition are made of its circuit by ac filter Circuit, rectifier circuit, circuit of power factor correction, timer circuit, PWM modulation circuit, LED lighting board driving circuit group Into；It is characterized in that：A kind of Width funtion input energy LED lamp driver with an automatic light meter is disclosed, and this energy driver applications are in lamp During tool, Dimming operation is carried out when can periodically LED light be arrived in the second half of the night automatically, reduces the work electricity at LED array both ends Pressure, reduces the power of headlamp, saves the power consumption of headlamp, and headlamp is made effectively to avoid circuit high voltage pair after midnight The harm of headlamp.