CN207018936U - A kind of projecting lamp for scenery based on constant-current dimming circuit - Google Patents

Abstract

The utility model discloses a kind of projecting lamp for scenery based on constant-current dimming circuit, including LED illuminating modules（1）And support（7）；2 connection sheets are provided with below LED illuminating modules（5）, connection sheet and support pass through rotating shaft（6）Be hinged, LED illuminating modules can rotate relative to support around the shaft；Support has 2 supporting legs；LED illuminating modules front is provided with multiple LEDs（4）And lens（8）；Lens are located above LED；Light shield is additionally provided with LED illuminating modules（3）, light shield is around lens perimeter setting；Light-control knob is additionally provided with LED illuminating modules（2）；Light-control knob is connected with variable resistance；Constant-current dimming circuit is provided with LED illuminating modules；Described constant-current dimming circuit includes driving chip and current feedback circuit.This projecting lamp for scenery is simple in construction, can adjust brightness and angle, and flexibility is good.

Description

A kind of projecting lamp for scenery based on constant-current dimming circuit

Technical field

It the utility model is related to a kind of projecting lamp for scenery based on constant-current dimming circuit.

Background technology

Projecting lamp for scenery is typically provided in scenic spot, the ground of installation, the light of projection high intensity into arbor branches and leaves；It is existing Some projecting lamp for sceneries, due to LED be it is fixed, can not flexible modulation angle, and can not flexible modulation brightness.In addition, scape If it is improper to see projecting lamp installation direction, light pollution is easily caused to visitor, i.e., easy direct projection causes eyes not into human eye It is suitable.Therefore, it is necessary to design a kind of new projecting lamp for scenery.

Utility model content

Technical problem to be solved in the utility model is to provide a kind of projecting lamp for scenery based on constant-current dimming circuit, should Projecting lamp for scenery can be simple in construction, easy to implement, and can flexible modulation direction.

The technical solution of utility model is as follows：

A kind of projecting lamp for scenery based on constant-current dimming circuit, including LED illuminating modules and support；

2 connection sheets are provided with below LED illuminating modules, connection sheet is hinged with support by rotating shaft, and LED illuminating modules can be around Rotating shaft rotates relative to support；

Support has 2 supporting legs.Support is Π fonts, simple in construction, easy to implement.

LED illuminating modules front is provided with multiple LEDs and lens；Lens are located above LED；Preferably 4, LED lamps, and 4 parallel connections, just in case part LED is damaged, and can be with normal work；

Light shield is additionally provided with LED illuminating modules, light shield is set around lens perimeter；For protecting the eyesight of visitor, Avoiding lighting makes visitor dazzling, is easy to visitor to be played at scenic spot；

Light-control knob is additionally provided with LED illuminating modules；Light-control knob is connected with variable resistance, and turn light-control knob can To change resistance；

Constant-current dimming circuit is provided with LED illuminating modules；

Described constant-current dimming circuit includes driving chip and current feedback circuit；

Described current feedback circuit includes resistance R1, R2 and R5 and reference voltage end VREF+；Resistance R2 is described Variable resistance.

Variable resistance is potentiometer；

The voltage output end of driving chip is the positive output end VOUT+ of constant-current dimming circuit；Constant pressure driving chip it is negative defeated Go out end ground connection；

Constant pressure driving chip is powered by DC-voltage supply end VIN+ and VIN-；

Reference voltage end VREF+ is grounded by resistance R1, R2 and the R5 being sequentially connected in series；

Resistance R5 and R2 tie point are the negative output terminal VOUT- of constant-current dimming circuit；

Resistance R1 and R2 tie point meet the feedback end FB of constant pressure driving chip.

Constant-current dimming circuit also includes voltage feedback circuit；

Driving chip uses FP7192 cake cores.

The lower end of supporting leg is tip.It is easy to support being inserted into soil and fixes.

Bridging has electric capacity C2 between the positive output end VOUT+ and negative input end of constant-current dimming circuit；

Bridging has electric capacity C1 between DC-voltage supply end VIN+ and VIN-.

Electric capacity C3 is connected between FB and ground.

The utility model is formed current feedback ring and is gone control voltage together using a reference power source partial pressure and sample resistance The mode of feedback goes to realize the constant current of electric current, and this method is referred to as reference voltage constant flow method.

LED includes more tri coloured lanterns, and a variety of colors is realized using tri coloured lantern.Or described LED includes blue led Lamp, red LED lamp and white LED lamp.

Beneficial effect：

Projecting lamp for scenery of the present utility model based on constant-current dimming circuit, there is advantages below：

(1) it is convenient to adjust angle

Due to being hinged between support and lamp body, therefore adjust angle conveniently, flexibility is good.

(2) light modulation is convenient

Using light-control knob combination constant-current dimming drive circuit, the luminosity of energy flexible modulation LED.

(3) dazzle is avoided

Due to being provided with light shield on lamp body (i.e. LED illuminating modules), it can effectively prevent light from being spread to periphery, avoid pair Visitor causes discomfort.

In addition, constant-current dimming circuit of the present utility model, is a kind of brand-new constant current implementation.Its core be by using Constant pressure chip realizes constant current.Moreover, the size of output current can flexibly be set, flexibility is good.Constant current core is used than original Piece application effect is good.Practice have shown that charging circuit control effect of the present utility model protrudes, cost significantly reduces.

In summary, this projecting lamp for scenery is compact-sized, and implementation cost is low, and flexible adjustment is convenient, can adjust brightness, has There is energy-saving effect.

Brief description of the drawings

Fig. 1 is LED illuminating module positive structure schematics；

Fig. 2 is the general structure schematic diagram (side view) of projecting lamp for scenery；

Fig. 3 is the general structure schematic diagram (front view) of projecting lamp for scenery；

Fig. 4 is light adjusting circuit schematic diagram

Label：1-LED illuminating modules, 2- light-control knobs, 3- light shields, 4-LED lamps, 5- connection sheets, 6- rotating shafts, 7- branch Frame, 8- lens.

Embodiment

The utility model is described in further details below with reference to the drawings and specific embodiments：

Embodiment 1：Such as Fig. 1~4, a kind of projecting lamp for scenery based on constant-current dimming circuit, including the He of LED illuminating modules 1 Support 7；

2 connection sheets 5 are provided with below LED illuminating modules, connection sheet is hinged with support by rotating shaft 6, LED illuminating modules It can be rotated around the shaft relative to support；

Support has 2 supporting legs.Support is Π fonts, simple in construction, easy to implement.

LED illuminating modules front is provided with multiple LEDs 4 and lens 8；Lens are located above LED；LED preferably 4, And 4 parallel connections, just in case part LED is damaged, and can be with normal work；

Light shield 3 is additionally provided with LED illuminating modules, light shield is set around lens perimeter；For protecting the eyesight of visitor, Avoiding lighting makes visitor dazzling, is easy to visitor to be played at scenic spot；

Light-control knob 2 is additionally provided with LED illuminating modules；Light-control knob is connected with variable resistance, and turn light-control knob is just Resistance can be changed；

Constant-current dimming circuit is provided with LED illuminating modules；

Described constant-current dimming circuit includes driving chip and current feedback circuit；

Described current feedback circuit includes resistance R1, R2 and R5 and reference voltage end VREF+；Resistance R2 is described Variable resistance.

Variable resistance is potentiometer；

The voltage output end of driving chip is the positive output end VOUT+ of constant-current dimming circuit；Constant pressure driving chip it is negative defeated Go out end ground connection；

Constant pressure driving chip is powered by DC-voltage supply end VIN+ and VIN-；

Reference voltage end VREF+ is grounded by resistance R1, R2 and the R5 being sequentially connected in series；

Resistance R5 and R2 tie point are the negative output terminal VOUT- of constant-current dimming circuit；

Resistance R1 and R2 tie point meet the feedback end FB of constant pressure driving chip.

Constant-current dimming circuit also includes voltage feedback circuit；

Driving chip uses FP7192 cake cores.

The lower end of supporting leg is tip.It is easy to support being inserted into soil and fixes.

Such as Fig. 4, in constant-current dimming circuit, each element or label declaration：

VIN+ --- -- input power positive pole.

VIN- --- -- input power negative pole.

VOUT+ --- -- out-put supply positive pole.

VOUT- ----out-put supply negative pole.

The positive pole of VREF+ --- -- reference power source

C1 is input filter capacitor.

C2 is output filter capacitor.

C3 is current sample feedback filtering.

R1, R2, R5, C3 form current sample feedback line.

Constant-current dimming circuit includes constant pressure driving chip and current feedback circuit；

(1) voltage output end of constant pressure driving chip is the positive output end VOUT+ of constant-current dimming circuit；Constant pressure driving chip Negative output terminal ground connection；

Constant pressure driving chip is powered by DC-voltage supply end VIN+ and VIN-；

(2) current feedback circuit described in includes resistance R1, R2 and R5 and reference voltage end VREF+；

Reference voltage end VREF+ is grounded by resistance R1, R2 and the R5 being sequentially connected in series；

Resistance R5 and R2 tie point are the negative output terminal VOUT- of constant-current dimming circuit；

Resistance R1 and R2 tie point meet the feedback end FB of constant pressure driving chip.

Operation principle explanation：

Using stable reference power supply as reference voltage, using R1, R2, R5 partial pressures obtain the voltage equal with FB, so as to Remove to adjust DCDC IC inside PWM by FB to control the size of output current.For example, working as output current becomes big, in sampling electricity Voltage on resistance R5 will raise, and because VRFE+ is fixed value, so as to be that FB voltages become big, FB becomes big, and dutycycle will subtract It is few, so as to be that output current is reduced, and a complete feedback is completed, reach the purpose of stabling current output.

Io output currents do not have any relation with output voltage and input voltage, and only and VFB.R1, R2, VREF are relevant, and For these parameters in specific design, they are all that fixed (VFB is fixed in stable state, for chip fp7192 constant pressures Chip, its steady-state value are 0.6v), so K is necessarily a fixed value, so formula：

Io=K/R5 has the fabulous linearity, and has excellent controllability.

Parameter above being assigned the occurrence being set above can obtain：

Io=(VFB* (R1+R2)-R2*VREF+)/R1*R5

=(0.6* (40+10) -10*2.5)/40*0.1

=1.25A

It can be seen that, this scheme introduces fixed VREF+ in equation more than, is only taken so that Io becomes one with R5 The linear equation of sample resistance, makes Io become constant, so as to reach the purpose of constant current.

R1 can be adjusted between 10K-100K.

The characteristics of constant-current circuit in this programme, is as follows：

1. use stable control and the stability control fixed VREF+ voltages, be easy to precision.

Fed back 2. current sample is become electric resistance partial pressure by use, it is more simple and reliable.

3. applicability is wide, the circuit of any required constant current can use.

Cost is greatly reduced, and cost is to use the 1/3 of IC constant current schemes.

Claims (2)

1. a kind of projecting lamp for scenery based on constant-current dimming circuit, it is characterised in that including LED illuminating modules (1) and support (7)；

2 connection sheets (5) are provided with below LED illuminating modules, connection sheet is hinged with support by rotating shaft (6), LED illuminating module energy Rotated around the shaft relative to support；

Support has 2 supporting legs；

LED illuminating modules front is provided with multiple LEDs (4) and lens (8)；Lens are located above LED；

Light shield (3) is additionally provided with LED illuminating modules, light shield is set around lens perimeter；

Light-control knob (2) is additionally provided with LED illuminating modules；Light-control knob is connected with variable resistance；

Constant-current dimming circuit is provided with LED illuminating modules；

Described constant-current dimming circuit includes driving chip and current feedback circuit；

Described current feedback circuit includes resistance R1, R2 and R5 and reference voltage end VREF+；Resistance R2 can power transformation for described Hinder device.

2. the projecting lamp for scenery according to claim 1 based on constant-current dimming circuit, it is characterised in that variable resistance is Potentiometer；

The voltage output end of driving chip is the positive output end VOUT+ of constant-current dimming circuit；The negative output terminal of constant pressure driving chip Ground connection；

Constant pressure driving chip is powered by DC-voltage supply end VIN+ and VIN-；

Reference voltage end VREF+ is grounded by resistance R1, R2 and the R5 being sequentially connected in series；

Resistance R5 and R2 tie point are the negative output terminal VOUT- of constant-current dimming circuit；

Resistance R1 and R2 tie point meet the feedback end FB of constant pressure driving chip；

Constant-current dimming circuit also includes voltage feedback circuit；

Driving chip uses FP7192 cake cores.