CN201260260Y

CN201260260Y - LED driver circuit capable of long lighting using alternating current electrical main supply

Info

Publication number: CN201260260Y
Application number: CNU2007203106658U
Authority: CN
Inventors: 顾茂章
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-12-17
Filing date: 2007-12-17
Publication date: 2009-06-17
Anticipated expiration: 2017-12-17

Abstract

The utility model relates to an ever-bright LED drive circuit using alternating current mains, which is electrically connected in a certain order by a step-down current-limiting component, a rectifier circuit, a filter circuit, an LED component, a battery pack and a switch. Among them, the step-down current limiting component and filter circuit can suppress the voltage pulse generated by the circuit when starting up, so that the circuit can work stably and reliably. The circuit can automatically maintain continuous lighting when the power is cut off, resume normal work after the power is received, and charge the battery pack that has supplied the LED power, and automatically stop charging after the battery pack has been charged, and keep the battery in a well-charged state . The LED lamp driven by this circuit can be used for the lighting of dark rooms without windows, the constant lighting of stairs, corridors and rooms at night, and the lighting of microwave ovens and refrigerators when the door is opened. Since each component of the circuit consumes very little power, the circuit efficiency is very high. LED is an efficient light-emitting element, so it saves electrodes. When high-power LEDs are popularized, it can also drive high-power LED lamps for lighting.

Description

That uses electric main can led drive circuit kept burning day and night

Affiliated technical field

The utility model relates to the drive circuit of the LED lamp that uses electric main; can keep LED when especially cutting off the power supply and continue illumination; can recover operate as normal automatically behind the telegram in reply; and to supplying with the batteries charging of LED group electricity consumption; automatically stop charging after finishing charging; and can protect battery pack too not charged, can make the led drive circuit of the charged state of battery pack maintenance again.

Background technology

The driving method of LED lamp adopts low-voltage power supply basically at present, as disposable battery, storage battery, rechargeable battery etc.Also useful electric main to storage battery or rechargeable battery charging, is used their driving LED lamps earlier again.Use the situation of the direct driving LED lamp of electric main, be used for the lamp of doing by the LED string mostly.By the LED string that many LED are together in series, its driving voltage and reverse breakdown voltage all improve significantly, thereby can adapt to 220 volts high pressure civil power.Also have a kind of drive circuit be by civil power after capacitors in series, be rectified into direct current through bridge rectifier again, supply with LED then.This method is more advanced on principle, but is actually used in when driving high-brightness LED, very easily damages LED when the contactor machine.

Summary of the invention

In order to overcome civil power through capacitors in series, the breakdown problem of LED that behind bridge rectifier, runs in the method to LED power supply again, the utility model provide can be directly with the drive circuit of 220 volts of electric main driving LED lamps, it can not damage LED when the contactor machine, thereby can reliablely and stablely work.Can also setting battery in this external circuit, it is luminous that it can make LED continue when civil power cuts off the power supply, and telegram in reply back circuit is automatically to battery charge, and can protect battery too not charged, and can make battery keep charged kilter again.

The technical scheme that its technical problem that solves the utility model adopts is: the single line of civil power connects the following millet cake (geometric position of double-pole double-throw (2X2) control switch S, down together, corresponding control switch upwards), the mid point of switch S connects the step-down current-limiting components, still have when preventing high-speed switch high-voltage pulse to produce, double-pole double-throw (2X2) control switch S quick bleeder resistance R in parallel at capacitor C two ends again when shutdown ₁An ac input end of the output of step-down current-limiting components and bridge rectifier is connected, and the single line in addition of another ac input end of bridge rectifier and civil power is connected.The positive output termination filter capacitor C of bridge rectifier ₁Anode, negative output termination filter capacitor C ₁Negative terminal.The LED assembly can be made up of one or more LED, and the connection of a plurality of LED can be series connection, and parallel connection or connection in series-parallel are decided on specific requirement.The LED assembly just terminate at filter capacitor C ₁Anode, the negative terminal of LED assembly is connected on filter capacitor C ₁Negative terminal.The positive electricity end of battery pack is connected on the mid point on half on control switch S right side, and the negative electrode of battery pack terminates at filter capacitor C ₁Negative terminal with the LED assembly.The following millet cake that control switch S right side is half meets filter capacitor C ₁With the anode of LED assembly, upper point does not connect.When start battery pack just terminate at filter capacitor C ₁With the positive electricity end of LED assembly, when shutdown, disconnect.In this circuit, if remove battery pack (B), control switch can be used single-pole double throw switch (Sw) instead, and becoming one does not have function kept burning day and night, uses the led drive circuit of electric main.

The beneficial effects of the utility model are: it can directly use 220 volts of electric mains to light the LED lamp.In addition, the battery pack LED assembly of powering during outage, realize continuing illumination, not only can recover automatically to light a lamp behind the telegram in reply with civil power, and can also be automatically to supplying the batteries charging of LED electricity, after being full of electricity, can also stop charging automatically, prevent that battery from because of undue charging influences useful life, can also make battery pack keep charged state simultaneously.In addition, the efficient of this circuit is high especially, and the capacitor in the step-down current-limiting circuit and the power consumption of bleeder resistance are all very little, the power consumption of filter capacitor is also very little, and 4 rectifier diodes will consume some electricity, and battery also will consume a bit, but the power consumption that adds altogether together is still very little.Though the power factor of circuit is not 1, it is a capacitive circuit, and electrical network is not only had harm, improves the effect of power factor of electric network in addition.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is a circuit diagram of the present utility model.

Fig. 2 is the embodiment of a simplification.

Embodiment

Fig. 1 is a circuit diagram of the present utility model.First is the step-down current-limiting components among the figure, and it is by capacitor C, bleeder resistance R, quick bleeder resistance R ₁Half formation of left side with double-pole double-throw (2 X 2) switch S.Diagram is the position (S closes, and promptly switch is upwards) of normal operating conditions, wherein R and C parallel connection, and the mid point of half is connected on the left of an end of RC parallel circuits and the double-pole double-throw switch S, the other end and quick bleeder resistance R ₁An end connect R ₁The other end and half more top (geometric position), double-pole double-throw switch S left side is connected, the single line of the more following and electric main of half is connected on the left of the double-pole double-throw switch.The numerical value of R is very big, and the power that it consumed is minimum, R ₁Though resistance not too big, it does not insert during circuit working, consumed power not, the dielectric loss of C is minimum under mains frequency.The back of step-down current limliting assembly connects an ac input end of bridge rectifier, and the single line in addition of another ac input end of bridge rectifier and electric main is connected.Bridge rectifier has positive and negative 2 outputs, positive output end and filter capacitor C ₁Anode connect negative output terminal and filter capacitor C ₁Negative terminal connect.The LED assembly can be made of one or more LED, and the connection of a plurality of LED can be series connection, and parallel connection or connection in series-parallel are decided on specific requirement.LED assembly and filter capacitor C ₁Parallel connection, the positive electrode termination filter capacitor C of LED assembly ₁Positive electricity end.The negative electricity of LED assembly negative electricity extreme and filter capacitor extremely links together, and the positive electricity end of battery pack B is connected on half mid point of control switch S right side, and half following millet cake of control switch S right side meets filter capacitor C ₁Anode with the LED assembly.The positive electricity end of battery pack is connected on filter capacitor C during start ₁Positive electricity end, both disconnect during shutdown.

Circuit has 2 operating states:

1.S be in position 1, this is a normal operating conditions.When civil power is arranged, lit a lamp by electric main, give the LED assembly power supply by battery pack B during outage, it is luminous that LED is continued.After outage finished, circuit recovered operate as normal, and automatically battery pack B is charged.

2.S be positioned at position 2, at this moment circuit and electric main disconnect, battery pack and LED assembly disconnect, and this is a turn-off.When lamp is not bright, select this state.

The 2nd embodiment can be with reference to figure 2.Removed battery pack B in the circuit of Fig. 1, at this moment control switch can be used single-pole double throw (1X2) switch instead and controls lighting of lamp or extinguish.This embodiment has no longer had the function that the outage back is continued illumination automatically, and lamp was bright when civil power was arranged, and lamp goes out during outage.The circuit of this embodiment can be realized miniaturization, and volume is minimum, is a good mini light night drive circuit.It is easy to increase the brightness of lamp with the method that increases the LED number.Elements all in the circuit all only consume minimum power, and the overwhelming majority of electric energy all is used to light the LED assembly, so it is a circuit that efficient is high.Because it is a capacitive circuit, electrical network is improved in addition the effect of power factor.

Claims

1. An ever-bright LED drive circuit using AC mains, consisting of step-down and current-limiting components, bridge rectifier circuit, filter capacitor, LED components, battery pack, and double-pole double-throw (2X2) control switch, its characteristics Yes: One line of the mains is connected to the lower end of the left half of the control switch (S), connected to one end of the step-down current limiting component (RC) through the control switch (S), and the other end of the step-down current limiting component is connected to the bridge One end of the AC input end of the bridge rectification circuit, the other end of the AC input end of the bridge rectification circuit is connected to another line of the mains; the positive output end of the bridge rectification circuit is connected to the positive end of the filter capacitor (C ₁ ) LED component and the filter capacitor ( C ₁ ) in parallel, their negative terminals are connected to the negative output terminal of the bridge rectifier circuit; the negative terminal of the battery pack (B) is connected to the negative terminal of the LED component and the filter capacitor, and the positive terminal of the battery pack is connected to the right half of the control switch The midpoint of the control switch on the right side is connected to the positive terminal of the LED component and the filter capacitor (C ₁ ).

2 The LED dynamic circuit according to claim 1, characterized in that: the step-down current limiting component is composed of a control switch, a capacitor (C), a leakage resistor (R) and a fast leakage resistor (R ₁ ), and the capacitor (C) A leakage resistor (R) is connected in parallel at both ends, one end of the capacitor (C) is connected to the midpoint of the left control switch, the other end is connected to one end of the fast leakage resistor (R ₁ ), the lower end of the left control switch is connected to one of the mains The upper end is connected to the other end of the fast leakage resistor (R ₁ ).

3. The LED driving circuit according to claim 1, wherein the LED component is composed of one or more LEDs, and the plurality of LEDs can be connected in series, in parallel or in series and parallel.

4. The LED driving circuit according to claim 1, characterized in that: the circuit is equipped with a battery pack (B) that supplies power to the LED group when the power is cut off, and can be automatically charged when the power is restored.

5. The LED drive circuit according to claim 1, characterized in that: after the battery pack (B) is removed from the circuit, the control switch can be replaced by a single-pole double-throw switch (Sw), which becomes a non-sunlight function and uses an AC Mains LED driver circuit.