CN205987486U - LED light source protection circuit - Google Patents

Abstract

The utility model provides a LED light source protection circuit, including a control switch, first switch supply circuit, the 2nd control switch, the 2nd ON -OFF control circuit, second switch supply circuit and discharge circuit, first switch supply circuit set up in a control switch one end, the other end is provided with the 2nd ON -OFF control circuit, the 2nd switch circuit and second switch supply circuit are connected, second switch supply circuit and the 2nd control switch are connected, discharge circuit one end is the power input and holds V1, the other end is power output and holds V2, the 2nd control switch sets up inside it. Change through the passive module of discharging with traditional and become to have the source module, can overcome that to discharge the effect in the tradition single, put the poor shortcoming of some effects. The utility model discloses can carry out discharge voltage threshold adjustment and discharge rate's regulation according to the user's needs to it is effectual to discharge, does not influence the LED lamps and lanterns and normally works.

Description

A kind of LED light protection circuit

Technical field

This utility model is related to a kind of circuit structure, is specifically designed a kind of LED light protection circuit.

Background technology

At present, LED lamp is used more and more widely in daily life, and LED lamp energy consumption is low, illumination effect Good, the advantages of easily regulation, gradually instead of original electric filament lamp.And in actual use it has been found that, close LED When tool, usually discharge because internal electric capacity can not will be stored in interior electric energy in time, the LED lamp being transferred to another post after closing Also there is twilight sunset.This problem can be ignored in daily life, but requires higher place in some light, needs In the case of closing lamp, cannot there is the appearance of twilight sunset.

And the LED light protection circuit occurring on the market at present, mostly passive module, control effect is barely satisfactory, and puts Electric effect also not completely it is impossible to enough makes corresponding adjustment according to side circuit, to adapt to different circuit characteristics, poor robustness, In addition because in the case of different requirement, the requirement of the velocity of discharge is different, so discharge module single at present can not be fine Meet current requirement.

Utility model content

Problem to be solved in the utility model is how to provide a kind of reliable discharge module, and the control effect of electric discharge is good, And the velocity of discharge can be adjusted.

In order to solve the above problems, this utility model provide a kind of LED light protection circuit, including the first controlling switch, First switch power supply circuits, the second controlling switch, second switch control circuit, second switch power supply circuits and discharge circuit, institute The first switch power supply circuits stated are arranged on first controlling switch one end, and the other end is provided with second switch control circuit, and second On-off circuit is connected with second switch power supply circuits, and second switch power supply circuits are connected with the second controlling switch, discharge circuit one Hold as power input V1, the other end is power output end V2, the second controlling switch is provided at its inner portion.By double switch Control, effectively realize the requirement that whole module rear after power-off is just operated, in the state of LED lamp normal work, put Electric module is not operated, and discharge module is effectively ensured does not affect the normal work of LED lamp, overcomes traditional passive electric discharge The impact to primary circuit for the module, improves the independence of discharge module.

Discharge circuit includes resistance R9, resistance R10 and resistance R11, and described resistance R9 is parallel with one another with resistance 10, one Hold as power input V1, the other end is connected with the second controlling switch, the other end of second switch connect with resistance R11 after with electricity Source output terminal V2 connects.It is circuit input/output terminal at discharge circuit two ends, because resistance R9 is parallel with one another with resistance R10, adjust Both resistances can affect the total resistance on discharge circuit, thus adjusting the overall velocity of discharge, because easy to adjust, Can different electric discharges be required to carry out the replacing of resistance, to reach the requirement of the optimal velocity of discharge, in resistance R9 and electricity Between resistance R10 parallel connected end and resistance R11, it is provided with second switch, second switch is exactly the break-make controlling discharge circuit, reduce Impact to LED lamp circuit is it is ensured that the correct work of discharge module under normal circumstances.

Second controlling switch is N-channel MOS FET, and its D pole and resistance R9 one end in parallel with resistance 10 is connected, its G pole and electric Resistance R11 one end connects, and its S pole is connected with power output end V2.Using MOSFET as switch, can preferably circuit be led to Break and be controlled.

Second switch control circuit includes resistance R6, resistance R7 and resistance R8, described resistance R6, resistance R7 and resistance R8 It is sequentially connected, be connected between resistance R6 and resistance R7 with also with the first controlling switch.Ratio between resistance R6, R7, R8 is to adjust Section discharge threshold, by adjusting the ratio of the resistance value between three, can be with the voltage between control input output end voltage It is poor that more than how many volts, just meeting star t-up discharge switchs, and no person does not start, by the setting of this function, can be to certain some spy Fixed scene just carries out control of discharge it is also possible to the function as protection light fixture is used.

Second switch power supply circuits include electric capacity C1 and electrochemical capacitor C2, and described electric capacity C1 is parallel with one another with electric capacity C2, Electrochemical capacitor C2 positive pole parallel connected end is connected with the junction point of resistance R7 and resistance R8 and the second controlling switch respectively.Two electric capacity Parallel connection mainly after a loss of power, is powered for starting the second controlling switch.

In electrochemical capacitor C2 positive pole parallel connected end and the second controlling switch connection line, it is additionally provided with the second stabilivolt.Pass through The control of stabilivolt, the voltage enabling to the second controlling switch acquisition is more stable, to obtain more stable startup voltage, makes Must open stable, discharge circuit is obtained in that a stable discharge time.

First switch supply module includes resistance R1, resistance R2, resistance R3, resistance R4 and resistance R5, described resistance R1 After one end is connected with energization input D1, be connected in series with resistance R2, resistance R3, resistance R4 successively, then with power output end V2D2 connects, and resistance R5 is connected in parallel with resistance R4, and its two parallel connected end is connected with the first controlling switch.Resistance R1, R2, R3, R4 It is sequentially connected in series, two ends are connected with energization input D1 and power output end V2D2 respectively, wherein resistance R1, R2, R3 is the first control Switch processed is powered, and it can the suitable voltage in the place of adjustment be that it is powered that three adjusts suitable resistance, and R4 and R5 then has concurrently The effect of the first controlling switch dump energy is absorbed during this electric discharge.

It is additionally provided with the first stabilivolt Z1 on the parallel line of resistance R4 and resistance R5.Can be first by this stabilivolt Controlling switch provides stable voltage so that the first controlling switch can steadily control in control period.

Energization input D1 input voltage type is DC voltage.DC voltage can be the power supply unit from light fixture homology In rectified bridge introduce power supply, the benefit quoting homology power supply unit is, when carrying out power down process to light fixture, first switch supplies Circuit also can power-off simultaneously, play an effect simultaneously, it is possible to increase the reaction sensitivity of discharge module.

First controlling switch is optical coupled switch.Optical coupled switch one side can quickly be reacted to its de-energized portion, breaks Workflow can quickly be started after electricity, on the other hand, the circuit shadow partly to second switch part for the first switch can be reduced Ring.

This utility model has advantages below：

1. pass through the control of two controlling switches, effectively fast reaction can be carried out to powering-off state.

2. second switch has turn on voltage threshold and sets, and simply can be set by adjusting resistance values, convenient Apply in different occasions.

3. discharge circuit can also be adjusted to the velocity of discharge, is easily adjusted again by resistance, can Control the speed of electric discharge, adapt to different application scenarios.

Brief description

Fig. 1 is a kind of module map of this utility model LED light protection circuit.

Fig. 2 is a kind of circuit structure diagram of this utility model LED light protection circuit.

Specific embodiment

Below in conjunction with the accompanying drawings preferred embodiment of the present utility model is described in detail so that of the present utility model a little It is more easy to be readily appreciated by one skilled in the art with feature, thus making apparent defining to protection domain of the present utility model.

A kind of this utility model LED light protection circuit, its function structure chart as shown in figure 1, the first controlling switch, first Switching power supplying circuit, the second controlling switch, second switch control circuit, second switch power supply circuits and discharge circuit, described First switch power supply circuits are arranged on first controlling switch one end, and the other end is provided with second switch control circuit, second switch Circuit is connected with second switch power supply circuits, and second switch power supply circuits are connected with the second controlling switch, and discharge circuit one end is Power input V1, the other end is power output end V2, and the second controlling switch is provided at its inner portion.

Specifically, as shown in Fig. 2 the first controlling switch is optical coupled switch, second switch is N ditch to its specific circuit structure Road MOSFET.It is first switch power supply circuits in the LED side of optical coupled switch, first switch is powered, and inside includes successively Resistance R1, R2, R3, R4 of series connection, resistance R1 mono- terminate energization input D1, and R4 mono- terminates power output end V2D2, R5 and R4 It is connected in parallel, the R4 top in parallel with R5 is provided with the first stabilivolt Z1, the light emitting diode also with optical coupled switch for the R5 two ends It is connected in parallel.

Then connect the junction point of R6 and R7 and the R8, R8 in R6, R7, the R8 being sequentially connected in series in the opposite side of optical coupled switch Simultaneously with electric capacity C1, C2 and resistor coupled in parallel, between C2 and R11 of parallel connected end, it is additionally provided with the second stabilivolt Z2, R11 at an upper portion thereof Top parallel connected end be attached with the G pole of MOSFET pipe, after power input V1 input with resistance R9 and resistance R10 simultaneously Connection connects, then is attached with the D pole of MOSFET pipe, and the S pole of MOSFET pipe then goes out end with power input and is connected.

Energization input D1 is rectified from LED lamp is with source current acquisition.

When LED lamp normally uses, energization input D1 input voltage, carry out through R1, R2, R3 after partial pressure, electric current warp Over commutation pipe Z1 powers to optical coupled switch, now the triode ON in optocoupler, and the conducting of audion makes power input V1 With the voltage of power output end V2 all fall on R6 so that R7 and R8 is shorted, the G pole tension of metal-oxide-semiconductor is not enough so that MOSFET pipe is not turned on, and discharge circuit is switched off, and discharge circuit does not work.

After LED lamp closes power supply, because being same source current, between supply input section and power output end V2D2 Voltage is 0, and the light emitting diode in optocoupler extinguishes because of power-off, and audion is not turned on, but a small amount of because also existing inside LED lamp So that still there being voltage between power input V1 and power output end V2, voltage carries out after partial pressure through R6, R7, R8 electric energy, warp Crossing z2, c1, c2 provides cut-in voltage, discharging circuit conduction after unlatching to MOSFET pipe G pole, that is, discharged.The process of electric discharge In, V1 after resistance R9 and R10 from MOSFET pipe D best S extremely after be connected with V2, the effect of R11 is to prevent peak current to be flushed to G Pole, protects to G pole, has certain Absorption.When voltage is less than setting value, MOSFET pipe is closed, and electric discharge terminates.

Above in conjunction with accompanying drawing, embodiment of the present utility model is explained in detail, but this utility model is not limited to Above-mentioned embodiment, in the ken that those of ordinary skill in the art possess, can also be without departing from this utility model On the premise of objective, various changes can be made.

Claims (10)

1. a kind of LED light protection circuit is it is characterised in that include the first controlling switch, first switch power supply circuits, the second control System switch, second switch control circuit, second switch power supply circuits and discharge circuit, described first switch power supply circuits are arranged In first controlling switch one end, the other end is provided with second switch control circuit, and second switch circuit and second switch are powered electricity Road connects, and second switch power supply circuits are connected with the second controlling switch, and discharge circuit one end is power input V1, and the other end is Power output end V2, the second controlling switch is provided at its inner portion.

2. LED light protection circuit according to claim 1 it is characterised in that described discharge circuit include resistance R9, Resistance R10 and resistance R11, described resistance R9 is parallel with one another with resistance 10, and its one end is power input V1, the other end and the Two controlling switches connect, and the other end of second switch is connected with power output end V2 with after resistance R11 series connection.

3. LED light protection circuit according to claim 2 is it is characterised in that the second described controlling switch is N-channel MOSFET, its D pole one end in parallel with resistance 10 with resistance R9 is connected, and its G pole is connected with resistance R11 one end, and its S pole is defeated with power supply Go out to hold V2 to connect.

4. LED light protection circuit according to claim 1 is it is characterised in that described second switch control circuit bag Include resistance R6, resistance R7 and resistance R8, described resistance R6, resistance R7 and resistance R8 are sequentially connected, resistance R6 and resistance R7 it Between be also connected with the first controlling switch.

5. LED light protection circuit according to claim 4 is it is characterised in that described second switch power supply circuits bag Include electric capacity C1 and electrochemical capacitor C2, described electric capacity C1 is parallel with one another with electric capacity C2, electrochemical capacitor C2 positive pole parallel connected end respectively with The junction point of resistance R7 and resistance R8 and the second controlling switch connect.

6. LED light protection circuit according to claim 5 it is characterised in that electrochemical capacitor C2 positive pole parallel connected end with On second controlling switch connection line, it is additionally provided with the second stabilivolt.

7. LED light protection circuit according to claim 1 is it is characterised in that described first switch supply module bag Include resistance R1, resistance R2, resistance R3, resistance R4 and resistance R5, after described resistance R1 one end is connected with energization input D1, according to Secondary be connected in series with resistance R2, resistance R3, resistance R4, then be connected with power output end V2D2, resistance R5 is in parallel with resistance R4 even Connect, its two parallel connected end is connected with the first controlling switch.

8. LED light protection circuit according to claim 7 is it is characterised in that parallel wire in resistance R4 and resistance R5 First stabilivolt Z1 is additionally provided with road.

9. LED light protection circuit according to claim 7 is it is characterised in that described energization input D1 input is electric Pressure type is DC voltage.

10. LED light protection circuit according to claim 1 is it is characterised in that the first described controlling switch is optocoupler Switch.