CN207939800U - A kind of LED linear constant-current control circuit based on discrete component - Google Patents

Abstract

The utility model discloses a kind of LED linear constant-current control circuit based on discrete component, is somebody's turn to do the LED linear constant-current control circuit based on discrete component and includes：It is electrically connected with each other input terminal, rectification module, linear constant current module and LED lamp bead module together, the linear constant current module includes the metal-oxide-semiconductor Q1 being connected between the rectification module and LED lamp bead module and metal-oxide-semiconductor Q2, biasing resistor R1 and the current sampling resistor R2 being connected in parallel with each other and current sampling resistor R3.The utility model LED linear constant-current control circuit is simple in structure, adjust the electric current for flowing through lamp bead, have the function that constant current, chip is controlled without special constant-current, it is driven using the voltage source of technology maturation, can be compared with there is good constant current accuracy under Width funtion, strong applicability enables the utility model have the extremely strong market competitiveness.

Description

A kind of LED linear constant-current control circuit based on discrete component

Technical field：

The utility model is related to automotive lamp product technical fields, refer in particular to a kind of LED linear current constant control based on discrete component Circuit.

Background technology：

Car light is to ensure that safe driving is mounted on the various traffic lights on automobile, being divided into headlamp and signal lamp two Class." eyes " of the car light as automobile are dull or eagle-eyed, are not only related to the external image of a car owner, and And it is the safety guarantee driven under the conditions of night or bad weather.It is tired that the car light of illuminating effect difference is easy to cause driver's eyes Labor, it is even more impossible to provide the effective irradiation brightness of driver and region, good car light can be provided for driver higher brightness and The better visual field can also improve the comfortableness and security of driving, it is ensured that driving safety makes driving be filled with unbounded confidence.Therefore, car light Bright lamplight is the important guarantee of driver drives vehicle safety.

The car light being commonly used uses halogen tungsten bulb, halogen tungsten bulb be in filling gas containing part halogen or The gas-filled incandescent lamp of halide, luminous efficiency 20Lm/W, colour temperature 3000K, service life 2000 hours or so.Thus may be used Intuitively to find out, not only service life is short for this halogen tungsten bulb, and energy consumption is higher, in addition, halogen tungsten bulb is in the mistake used Brightness can continuously decrease in journey, the phenomenon that light decay occur.In shortage of resources, energetically advocate energy-saving and emission-reduction today, this halogen tungsten The use of light bulb obviously has been unable to meet the demand in epoch.

For this purpose, occurring LED car lamp on the market, LED car lamp has the following advantages：

One, energy saving：It is that luminous energy is directly converted by electric energy by light emitting diode, just corresponds to pass compared with common in-vehicle light bulb power consumption The 1/10 of system lamp, can preferably save oil consumption, automobile circuit is protected not burnt out by excessively high load current.

Two, environmentally friendly：There is no ultraviolet light and infrared ray in spectrum, calorific value is small, does not also radiate, and dazzle is small, and discarded Object is recyclable, does not pollute without mercury element, can belong to typical green illumination LED light source with safe touch.

Three, long lifespan：The part also not loosened in lamp body, there is no filament light-emittings easily to burn, heat deposition, light decay etc. lack Point, under appropriate electric current and voltage, service life was up to 8-10 ten thousand hours, than 10 times of conventional light source long lifespan or more.(have It is primary to replace, lifelong the characteristics of using)

Four, high brightness, high temperature resistant.(electric energy is converted directly into luminous energy, and calorific value is small, and completely available hand touches, and puts safely The heart)

Five, small.Designer can arbitrarily convert lamps and lanterns pattern, enable vehicle configuration diversified.Automobile vendor favors What the advantages of LED is entirely LED itself was determined.

Six, stability is good, and led anti-seismic performances are strong：Resin-encapsulated, it is not easily broken, it is easy storage and transport.

Seven, luminance purity is high, and clear color is bright-coloured, filters without lampshade, light wave error is within 10 nanometers.

Eight, reaction speed is fast, without the thermal starting time, can shine in microsecond, and traditional glass bulb light bulb then has prolong for 0.3 second Late, it can prevent from knocking into the back, ensure traffic safety.

LED car lamp is suitable for the various illumination applications of automotive electronics, including headlight (high beam and dipped headlight), fog lamp, tail Lamp, brake lamp, turn signal lamp, day driving lamp, courtesy light, instrument panel lamp, license plate lamp, vehicle door lamp, room light lamp show Wide lamp, navigation, entertainment systems, backlight and indicator light etc..

It is shown in Figure 1, it is the driving circuit in LED car lamp, usual automobile storage battery nominal rated voltage value is DC 12V, Therefore producer is when designing reference and test, be all with DC12V is reference, but according to actual measurement, and voltage when normal driving is in 10- Between 14.4V, since LED lamp bead voltage is certain, the resistance value of LED current-limiting resistances R10 is certain, is added in the both ends LED current-limiting resistance R10 On voltage be raised and lowered, cause what LED current-limiting resistance R10 electric currents can be proportional to rise or fall, LED lamp bead electric current rises When, the power consumption of LED lamp bead temperature and LED current-limiting resistances R10 all can rapidly increase, and influence service life and the stability of car light；And LED When lamp bead electric current declines, design requirement is not achieved in the luminous flux and illumination of car light.

In view of this, the present inventor proposes following technical scheme.

Utility model content：

The purpose of the utility model is to overcome the deficiencies in the prior art, provide a kind of LED linear based on discrete component Constant-current control circuit.

In order to solve the above-mentioned technical problem, the utility model uses following technical proposals：The LED based on discrete component Linearity constant current control circuit includes：It is electrically connected with each other input terminal, rectification module, linear constant current module and LED together Lamp bead module, the linear constant current module include the metal-oxide-semiconductor Q1 being connected between the rectification module and LED lamp bead module and Metal-oxide-semiconductor Q2, biasing resistor R1 and the current sampling resistor R2 being connected in parallel with each other and current sampling resistor R3.

Furthermore, in above-mentioned technical proposal, the one end the biasing resistor R1 is connecting the LED lamp bead module just Pole, the other end connect the poles G of metal-oxide-semiconductor Q1；The cathode of the poles the D connection LED lamp bead module of metal-oxide-semiconductor Q1；The poles G of metal-oxide-semiconductor Q2 connect The poles S of metal-oxide-semiconductor Q1, the poles G of the poles the D connection metal-oxide-semiconductor Q1 of metal-oxide-semiconductor Q2, the poles S of metal-oxide-semiconductor Q2 connect the cathode of the rectification module, The current sampling resistor R2 and current sampling resistor R3 are all connected between the poles S of metal-oxide-semiconductor Q2 and the poles G.

Furthermore, in above-mentioned technical proposal, the input terminal is AC/DC input terminals, input voltage 10-15V.

Furthermore, in above-mentioned technical proposal, the LED lamp bead module is combined by multiple LED lamp bead connection in series-parallel one It rises and constitutes.

Furthermore, in above-mentioned technical proposal, the rectification module include by the common cathode diode D1 that is connected with each other and The rectifier bridge of common anode diode D2 compositions, the poles S of the cathode connection metal-oxide-semiconductor Q2 of the rectifier bridge；The anode connection institute of the rectifier bridge State the anode in LED lamp bead module.

After adopting the above technical scheme, the utility model has the advantages that compared with prior art：This practicality New LED linearity constant current control circuit is simple in structure, adjusts the electric current for flowing through lamp bead, has the function that constant current, without special With current constant control chip, driven using the voltage source of technology maturation, it can be compared with having good constant current accuracy, applicability under Width funtion By force, enable the utility model that there is the extremely strong market competitiveness.

Description of the drawings：

Fig. 1 is the circuit diagram of the driving circuit in prior art LED car lamp；

Fig. 2 is the principles of the present invention block diagram；

Fig. 3 is the circuit diagram of the utility model.

Specific implementation mode：

The utility model is further illustrated with reference to specific embodiments and the drawings.

See Fig. 2, shown in 3, be a kind of LED linear constant-current control circuit based on discrete component comprising：Mutually electrically connect Input terminal 1, rectification module 2, linear constant current module 3 and the LED lamp bead module 4 being connected together, it is characterised in that：It is described linear Constant flow module 3 includes the metal-oxide-semiconductor Q1 being connected between the rectification module 2 and LED lamp bead module 4 and metal-oxide-semiconductor Q2, biasing resistor The R1 and current sampling resistor R2 being connected in parallel with each other and current sampling resistor R3.The utility model LED linear current constant control Circuit structure is simple, and chip is controlled without special constant-current, is driven using the voltage source of technology maturation, can be good compared with having under Width funtion Good constant current accuracy, strong applicability enable the utility model have the extremely strong market competitiveness.

The one end the biasing resistor R1 connects the anode of the LED lamp bead module 4, and the other end connects the poles G of metal-oxide-semiconductor Q1； The cathode of the poles the D connection LED lamp bead module 4 of metal-oxide-semiconductor Q1；The poles S of the poles the G connection metal-oxide-semiconductor Q1 of metal-oxide-semiconductor Q2, the poles D of metal-oxide-semiconductor Q2 The poles G of metal-oxide-semiconductor Q1 are connected, the poles S of metal-oxide-semiconductor Q2 connect the cathode of the rectification module 2, the current sampling resistor R2 and electric current Sample resistance R3 is all connected between the poles S of metal-oxide-semiconductor Q2 and the poles G.

The input terminal 1 is AC/DC input terminals, input voltage 10-15V.

The LED lamp bead module 4 is united by multiple LED lamp bead connection in series-parallel and is constituted.

The rectification module 2 includes the rectifier bridge that common cathode diode D1 by being connected with each other and common anode diode D2 are formed, The poles S of the cathode connection metal-oxide-semiconductor Q2 of the rectifier bridge；The anode of the rectifier bridge connects the anode in the LED lamp bead module 4.

The LED lamp bead module 4 uses 3020LED lamp beads or 3030LED lamp beads.

The operation principle of the utility model is：Input terminal 1 inputs AC/DC voltages, by biasing resistor R1 to the grid of metal-oxide-semiconductor Q1 Pole (poles G) provides bias current, metal-oxide-semiconductor Q1 conductings, and anode of 2 cathode voltage of rectification module through LED lamp bead module 4 flows into, then It is flowed out from 4 cathode of LED lamp bead module, flows into the drain electrode (poles D) of metal-oxide-semiconductor Q1, and flow out from metal-oxide-semiconductor Q1 source electrodes (poles S), then flow Enter current sampling resistor R2, R3, then arrive 2 cathode of rectification module, current loop is formed, at this point, due to the grid (G of metal-oxide-semiconductor Q2 Pole) it is also connected to above current sampling resistor R1, R2, and the same current potential of R1, R2, and the gate-source (poles G-S) of metal-oxide-semiconductor Q2 exists Turn-on threshold voltage, and be a relatively-stationary voltage value, the voltage of such current sampling resistor R2, the both ends R3 are also just suitable In a reference voltage, when input voltage increases or reduces, the poles metal-oxide-semiconductor Q2D, the poles S voltage also reduce accordingly Or increase, the G pole tensions of metal-oxide-semiconductor Q1 are adjusted, and then adjust the electric current for flowing through LED lamp bead module 4, reaches the work of constant current With.It is possible thereby to learn, constant of the electric current of this programme is related with the G pole tensions of metal-oxide-semiconductor Q2, and the height with input voltage does not have There are much relations, thus can be very good to solve the problems, such as that existing scheme exists.

Certainly, it is not to implement to limit the utility model the foregoing is merely specific embodiment of the utility model Range, it is all according to the equivalent change or modification that structure, feature and principle is done described in present utility model application the scope of the claims, it should all wrap It includes in present utility model application the scope of the claims.

Claims (5)

1. a kind of LED linear constant-current control circuit based on discrete component comprising：It is electrically connected with each other input terminal together (1), rectification module (2), linear constant current module (3) and LED lamp bead module (4), it is characterised in that：The linear constant current module (3) include the metal-oxide-semiconductor Q1 being connected between the rectification module (2) and LED lamp bead module (4) and metal-oxide-semiconductor Q2, biasing resistor R1 And the current sampling resistor R2 and current sampling resistor R3 being connected in parallel with each other.

2. a kind of LED linear constant-current control circuit based on discrete component according to claim 1, it is characterised in that：Institute The anode that the one end biasing resistor R1 connects the LED lamp bead module (4) is stated, the other end connects the poles G of metal-oxide-semiconductor Q1；Metal-oxide-semiconductor Q1's The poles D connect the cathode of LED lamp bead module (4)；The poles S of the poles the G connection metal-oxide-semiconductor Q1 of metal-oxide-semiconductor Q2, the poles D of metal-oxide-semiconductor Q2 connect MOS The poles G of pipe Q1, the poles S of metal-oxide-semiconductor Q2 connect the cathode of the rectification module (2), the current sampling resistor R2 and current sampling Resistance R3 is all connected between the poles S of metal-oxide-semiconductor Q2 and the poles G.

3. a kind of LED linear constant-current control circuit based on discrete component according to claim 1, it is characterised in that：Institute It is AC/DC input terminals, input voltage 10-15V to state input terminal (1).

4. a kind of LED linear constant-current control circuit based on discrete component according to claim 1, it is characterised in that：Institute It states LED lamp bead module (4) and is united by multiple LED lamp bead connection in series-parallel and constituted.

5. a kind of LED linear constant-current control circuit based on discrete component according to any one of claims 1-4, special Sign is：The rectification module (2) includes the rectifier bridge that common cathode diode D1 by being connected with each other and common anode diode D2 are formed, The poles S of the cathode connection metal-oxide-semiconductor Q2 of the rectifier bridge；The anode of the rectifier bridge connects the anode in the LED lamp bead module (4).