CN207692104U - A kind of LED light regulator circuit - Google Patents

Abstract

The utility model is related to LED lamp drive circuit technical field more particularly to a kind of LED light regulator circuits of no electrolytic capacitor, including driving power, LED light and the regulator circuit being connected between the driving power and LED light.The goal of the invention of the utility model is to provide a kind of LED light modulations circuit for lamp solve the technical issues of influencing LED drive power service life using electrolytic capacitor in existing LED drive power using technical solution provided by the utility model.

Description

A kind of LED light regulator circuit

Technical field

The utility model is related to the LED light voltage stabilizings of LED lamp drive circuit technical field more particularly to a kind of no electrolytic capacitor Circuit.

Background technology

As countries in the world are in gradually nonimportation and sale ordinary lighting incandescent lamp, novel, green, efficient, long-life LED lighting technology obtained unprecedented development.Long-life is one of great advantage of LED illumination, its average life Reach 80000-100000 hours.

For the LED drive power of single stage type, a storage capacitor is needed, since the storage capacitor of electrolytic capacitor is very big, Existing LED drive power selects electrolytic capacitor mostly, and the service life of electrolytic capacitor only has 12000 hours or so, is to influence The main element of LED drive power bulk life time.In order to improve the service life of AC-DC LED drive powers, it is necessary to remove Electrolytic capacitor.And the driving voltage at LED light both ends can generate fluctuation with the variation of input voltage so that LED light will produce Flicker, influences illuminating effect.

Utility model content

The goal of the invention of the utility model is to provide a kind of LED light modulations circuit for lamp, using skill provided by the utility model Art scheme solves the technical issues of influencing LED drive power service life using electrolytic capacitor in existing LED drive power.

In order to solve the above-mentioned technical problem, the utility model provides a kind of LED light regulator circuit, including driving power, LED Lamp and the regulator circuit being connected between the driving power and LED light；

The regulator circuit includes capacitance C3, C5 and C9, resistance R1-R2 and R4, diode D3 and Z2, triode Q1, light Coupling U1 and transformer T1；The transformer T1 includes armature winding, feedback winding and secondary windings；The capacitance C9 is connected to institute Between the positive and negative polarities for stating driving power；The base stage of the triode Q1 accesses the driving power by the resistance R1-R2 Anode, emitter accesses the cathode of the driving power；The both ends of the armature winding are respectively connected to the driving power The collector of the positive and described triode Q1；The driving power is accessed in one end of the optocoupler U1 output ends by capacitance C5 Cathode, the other end access one end of the feedback winding；The other end of the feedback winding passes through capacitance C3 and resistance R4 accesses The base stage of the triode Q1；The both ends of the secondary windings and the input terminal of optocoupler U1 respectively access the two of the LED light End, and one end of the secondary windings accesses one end of the LED light by diode D3, the other end of the LED light passes through Diode Z2 ground connection.

Preferably, the driving power is to access the rectifier power source of alternating current.

Preferably, current-limiting circuit is accessed between one end of the LED light and diode Z2.

Preferably, the current-limiting circuit includes resistance R10-R12 and triode Q3；The resistance R10-R11 parallel connections access The secondary windings of the transformer and one end of LED light；The base stage of the triode Q3 accesses the LED light by resistance R12 One end, collector accesses the secondary windings, and emitter accesses the diode Z2.

Preferably, further include protection circuit；The protection circuit is by diode Z1, resistance R5-R6 and triode Q1-Q2 It constitutes；Between the emitter and the cathode of driving power of the resistance R6-R7 parallel connections access triode Q1；The triode Q2's Base stage accesses the emitter of triode Q1 by resistance R5, and collector accesses the base stage of triode Q1, emitter access driving electricity The cathode in source；The base stage of triode Q2 also accesses one end of feedback winding by diode Z1.

Preferably, further include the RCD absorbing circuits at the armature winding both ends in parallel for accessing the transformer；The RCD inhales After the electric routing resistance R3 of receipts, capacitance C2 and diode D1 compositions, the resistance R3 and capacitance C2 parallel connections, gone here and there with the diode D1 Connection.

From the foregoing, it will be observed that following advantageous effect can be obtained using the utility model：The utility model by transformer secondary Winding exports required voltage to LED light so that low capacity capacitance can be used in capacitance C9, avoids capacitance aging effects driving electricity The service life in source, and circuit provided by the utility model makes the pressure drop of LED light almost unchanged, to realize LED light two The driving voltage at end can remain stable with the variation of input voltage, and LED light is avoided to generate flicker.

Description of the drawings

In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to this practicality Attached drawing is briefly described needed in the description of new embodiment or the prior art.It should be evident that being described below In attached drawing be only that a part of the embodiment of the utility model is not paying wound for those of ordinary skill in the art Under the premise of the property made is laborious, other drawings may also be obtained based on these drawings.

Fig. 1 is the utility model embodiment LED light regulator circuit figure.

Specific implementation mode

The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model Clearly and completely describe.Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than whole Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without creative efforts The every other embodiment obtained, shall fall within the protection scope of the present invention.

For the LED drive power of single stage type, a storage capacitor is needed, since the storage capacitor of electrolytic capacitor is very big, It is the main element for influencing LED drive power bulk life time that existing LED drive power selects electrolytic capacitor, electrolytic capacitor mostly； And the driving voltage at LED light both ends can generate fluctuation with the variation of input voltage so that LED light will produce flicker, influence Illuminating effect.

Fig. 1 is referred to, in order to solve the above-mentioned technical problem, the present embodiment provides a kind of LED light regulator circuits, including driving Power supply, LED light and the regulator circuit being connected between driving power and LED light.The driving power can be the whole of access alternating current Galvanic electricity source.

Specifically, regulator circuit include capacitance C3, C5 and C9, resistance R1-R2 and R4, diode D3 and Z2, triode Q1, Optocoupler U1 and transformer T1.Wherein transformer T1 includes armature winding, feedback winding and secondary windings.

In circuit connection structure, capacitance C9 is connected between the positive and negative polarities of driving power.The base stage of triode Q1 passes through The anode of resistance R1-R2 access driving powers is opened in resistance R1-R2 to triode Q1 offers after circuit accesses driving power Streaming current makes triode Q1 begin to turn on；Emitter accesses the cathode of driving power；The both ends of armature winding are respectively connected to drive The anode of power supply and the collector of triode Q1.One end of optocoupler U1 output ends accesses the cathode of driving power by capacitance C5, The other end accesses one end of feedback winding；The other end of feedback winding accesses the base of triode Q1 by capacitance C3 and resistance R4 Pole.The both ends of secondary windings and the input terminal of optocoupler U1 respectively access the both ends of LED light, and one end of secondary windings passes through two One end of pole pipe D3 access LED light, the other end of LED light are grounded by diode Z2.

The self oscillating regime of Switching Power Supply：After accessing power supply, driving power is added to by primary all the way Triode Q1 collectors, another way make triode Q1 start to lead by providing starting current to triode Q1 in resistance R1-R2 Logical, collector current Ic linear increases in the armature winding of transformer incude three poles of sening as an envoy in transformer feedback winding The base stage of pipe Q1 is that just, the extremely negative positive and negative feedthrough voltage of transmitting makes triode Q1 be saturated quickly.At the same time, induced voltage is given Capacitance C3 chargings, with increasing for capacitance C3 charging voltages, the base potential of triode Q1 is gradually lower, and triode Q1 is caused to move back Go out saturation region, Ic starts to reduce, and the base stage for the triode Q1 that sends as an envoy to is incuded in transformer feedback winding for negative, transmitting is extremely positive Voltage makes triode Q1 end rapidly, and at this moment diode D3 is connected, and the energy storage in high frequency transformer T armature windings is released to negative It carries.

When triode Q1 ends, there is no induced voltage in transformer feedback winding, direct current supply input voltage is again through R4 C3 reverse chargings are given, the base potential of triode Q1 is gradually increased, it is made to be connected again, overturning again reaches saturation state, electricity Road repeats oscillation and goes down like this.

Further include protection circuit and RCD absorbing circuits in order to ensure the stable operation of electric current.

Wherein, protection circuit is made of diode Z1, resistance R5-R6 and triode Q1-Q2.Specifically, resistance R6-R7 Between the emitter and the cathode of driving power of parallel connection access triode Q1.The base stage of triode Q2 accesses three poles by resistance R5 The emitter of pipe Q1, collector access the base stage of triode Q1, and emitter accesses the cathode of driving power.The base stage of triode Q2 One end of feedback winding is also accessed by diode Z1.It is parallel with diode D2 at the both ends of feedback winding.The protection circuit has There are short-circuit protection and overcurrent protection function, when output short-circuit, the secondary windings current potential of transformer is and then lifted, to make two Pole pipe Z1 breakdown, makes triode Q2 be connected, while the voltage at the both ends resistance R6-R7 rises through rapidly resistance R5 so that three poles Pipe Q2 accelerates conducting, breaks triode Q1 base potentials, to turn off oscillation, plays the role of short-circuit protection；When output current increases When big, fall under output voltage, fed back by diode Z1, so that optocoupler U1 conducting degree is reinforced, namely by optocoupler secondary by two The electric current that pole pipe D2 flows to triode Q2 increases so that triode Q2 conductings, to realize overcurrent protection function.

Wherein, the armature winding both ends of RCD absorbing circuits parallel connection access transformer, by resistance R3, capacitance C2 and diode After D1 compositions, resistance R3 and capacitance C2 parallel connections, connect with diode D1, it plays and absorbs leakage inductance Impulse Voltage.

Furthermore it is also possible to access current-limiting circuit between one end of LED light and diode Z2.Current-limiting circuit includes resistance R10-R12 and triode Q3.Resistance R10-R11 parallel connections access one end of the secondary windings and LED light of transformer；Triode Q3's Base stage accesses one end of LED light by resistance R12, and collector accesses secondary windings, and emitter accesses diode Z2.

Simultaneously in order to solve light modulation low side flicker problem, increases R13-R14, C1, L0, R15-R16 and maintain low side light modulation electricity Stream so that light modulation is more smooth.

Required voltage is exported from the secondary windings of transformer T to load.In the secondary windings of transformer, output is extremely The output voltage of LED light is determined that the electrolytic capacitor big without capacity in entire circuit, capacitance C9 is by original by diode Z2 Big electrolysis is replaced with low capacity capacitance, avoids the service life of capacitance aging effects driving power.

And since the transformer primary side pair side turn ratio is certain, silicon-controlled copped wave, input voltage is lower, and output energy becomes naturally Small, in addition positive feedback winding induced voltage is also low, the base stage saturation current of triode Q1 becomes smaller, and triode Q1 falls back on amplification region, Internal resistance increase is divided into portion voltage, and the voltage of primary side is just lower, and secondary side energy smaller, the pressure drop of LED light is almost unchanged, I =P/U avoids LED light from generating to realize that the driving voltage at LED light both ends can remain stable with the variation of input voltage Flicker.

Embodiments described above does not constitute the restriction to the technical solution protection domain.It is any in above-mentioned implementation Modifications, equivalent substitutions and improvements etc., should be included in the protection model of the technical solution made by within the spirit and principle of mode Within enclosing.

Claims (6)

1. a kind of LED light regulator circuit, it is characterised in that：Including driving power, LED light and be connected to the driving power with Regulator circuit between LED light；

The regulator circuit includes capacitance C3, C5 and C9, resistance R1-R2 and R4, diode D3 and Z2, triode Q1, optocoupler U1 And transformer T1；The transformer T1 includes armature winding, feedback winding and secondary windings；The capacitance C9 is connected to the drive Between the positive and negative polarities of dynamic power supply；The base stage of the triode Q1 is accessing the driving power just by the resistance R1-R2 Pole, emitter access the cathode of the driving power；The both ends of the armature winding are respectively connected to the anode of the driving power With the collector of the triode Q1；The negative of the driving power is accessed in one end of the optocoupler U1 output ends by capacitance C5 Pole, the other end access one end of the feedback winding；The other end of the feedback winding accesses institute by capacitance C3 and resistance R4 State the base stage of triode Q1；The both ends of the secondary windings and the input terminal of optocoupler U1 respectively access the both ends of the LED light, And one end of the secondary windings accesses one end of the LED light by diode D3, the other end of the LED light passes through two poles Pipe Z2 ground connection.

2. a kind of LED light regulator circuit according to claim 1, it is characterised in that：The driving power is access alternating current Rectifier power source.

3. a kind of LED light regulator circuit according to claim 2, it is characterised in that：In one end of the LED light and two poles Current-limiting circuit is accessed between pipe Z2.

4. a kind of LED light regulator circuit according to claim 3, it is characterised in that：The current-limiting circuit includes resistance R10-R12 and triode Q3；The resistance R10-R11 parallel connections access the secondary windings of the transformer and one end of LED light；Institute The base stage for stating triode Q3 accesses one end of the LED light by resistance R12, and collector accesses the secondary windings, emitter Access the diode Z2.

5. a kind of LED light regulator circuit according to claim 4, it is characterised in that：It further include protection circuit；The protection Circuit is made of diode Z1, resistance R5-R6 and triode Q1-Q2；The hair of the resistance R6-R7 parallel connections access triode Q1 Between emitter-base bandgap grading and the cathode of driving power；The base stage of the triode Q2 accesses the emitter of triode Q1, collection by resistance R5 Electrode accesses the base stage of triode Q1, and emitter accesses the cathode of driving power；The base stage of triode Q2 also passes through diode Z1 Access one end of feedback winding.

6. a kind of LED light regulator circuit according to claim 5, it is characterised in that：It further include the access transformation in parallel The RCD absorbing circuits at the armature winding both ends of device；The RCD absorbing circuits are made of resistance R3, capacitance C2 and diode D1, institute After stating resistance R3 and capacitance C2 parallel connections, connect with the diode D1.