CN203748056U

CN203748056U - Power source for LED light source capacitive reactance current limiting and electronic filtering

Info

Publication number: CN203748056U
Application number: CN201420005361.0U
Authority: CN
Inventors: 王汕众
Original assignee: SHENZHEN JIUTONG OPTOELECTRONIC TECHNOLOGY Co Ltd
Current assignee: SHENZHEN JIUTONG OPTOELECTRONIC TECHNOLOGY Co Ltd
Priority date: 2014-01-06
Filing date: 2014-01-06
Publication date: 2014-07-30
Anticipated expiration: 2024-01-06

Abstract

The utility model discloses a power source for LED light source capacitive reactance current limiting and electronic filtering. The power source comprises an alternating-current input power source. The alternating-current input power source is connected with a rectifying circuit. A capacitor C1 is serially connected between the rectifying circuit and the alternating-current input power source. The rectifying circuit is connected with a filter capacitor C2. The filter capacitor C2 is serially connected with an electronic filter circuit. The alternating current of the alternating-current input power source is converted into a smooth, consistent and stable direct current through the capacitor C1, the rectifying circuit, the filter capacitor C2 and the electronic filter circuit, and outputted to an LED lamp to make the LED lamp achieve the non-flickering or weak-flickering lighting purpose. According to the utility model, advantages of simple structure, reliable working performance and easy batch production can be realized; and some disadvantages of a conventional power source can be overcome, so the production cost can be greatly reduced on the premise of ensuring the standard requirements of LED lighting lamps.

Description

For the capacitive reactance current limliting of LED light source and the power supply of electronic filtering

technical field

The utility model relates to power supply technique field, relates in particular to a kind of power supply driving power circuit of LED light source.

Background technology

The power supply majority that tradition LED lighting adopts, with electronic switch application-specific integrated circuit (ASIC) and many peripheral electron elements composition, also has methods such as adopting resistance step-down, capacitance decompression, constant current integrated circuit to realize.If adopt its complex structure of the good power source design of structural behaviour, the complicated cost of batch production link is higher, and rate of finished products is lower; The poor-performing of scheme that cost simple in structure is low, there are harmful effect in brightness to LED lamp, stroboscopic, life-span etc., can not meet the demands.

Utility model content

Technical problem to be solved in the utility model is to provide a kind of production cost low and the capacitive reactance current limliting for LED light source of stable performance and the power supply of electronic filtering.

For solving the problems of the technologies described above, the technical solution of the utility model is: for the capacitive reactance current limliting of LED light source and the power supply of electronic filtering, comprise alternating current input power supplying, described alternating current input power supplying is connected with rectification circuit, between described rectification circuit and described alternating current input power supplying, be in series with capacitor C1, described rectification circuit is connected with filtering capacitor C2, and described filtering capacitor C2 is in series with electronic filter circuit.

As the preferred technical scheme of one, described electronic filter comprises fet Q1, be parallel to the resistance R 3 of the fet D-G utmost point, be series at the fet S utmost point resistance R 5, be parallel to the fet G utmost point andthe capacitor C 3 of resistance R 5 right-hand members and resistance R 4.

As the preferred technical scheme of one, described electronic filter comprises double pole triode.

Owing to having adopted technique scheme, for the capacitive reactance current limliting of LED light source and the power supply of electronic filtering, comprise alternating current input power supplying, described alternating current input power supplying is connected with rectification circuit, between described rectification circuit and described alternating current input power supplying, be in series with capacitor C1, described rectification circuit is connected with filtering capacitor C2, and described filtering capacitor C2 is in series with electronic filter circuit; Alternating current input power supplying, through capacitor C1, rectification circuit, filtering capacitor C2 and electronic filter circuit, is converted to level and smooth consistent stable DC electric current by alternating current, exports to LED lamp, makes LED lamp reach the stabilized illumination object without stroboscopic or faint stroboscopic; The utility model is simple in structure, reliable working performance, be convenient to batch production; And overcome the some shortcomings of conventional power source, under the prerequisite that ensures LED lighting standard-required, significantly reduced production cost.

brief description of the drawings

Fig. 1 is the circuit theory diagrams of the utility model embodiment;

Fig. 2 is the explosive view in kind of the utility model embodiment;

In figure: 1-light source board; 2-protective cover; 3-fixture; 4-LED lamp; 5-fuse; 6-field effect transistor; 7-diode; 8-electric capacity.

Embodiment

Below in conjunction with drawings and Examples, further set forth the utility model.In the following detailed description, only by the mode of explanation, some example embodiment of the present utility model has been described.Undoubtedly, those of ordinary skill in the art can recognize, in the situation that not departing from spirit and scope of the present utility model, can revise described embodiment by various mode.Therefore, accompanying drawing is illustrative with being described in essence, instead of for limiting the protection range of claim.

As shown in Figure 1, for the capacitive reactance current limliting of LED light source and the power supply of electronic filtering, for the capacitive reactance current limliting of LED light source and the power supply of electronic filtering, comprise alternating current input power supplying, described alternating current input power supplying is connected with rectification circuit, between described rectification circuit and described alternating current input power supplying, be in series with capacitor C1, described rectification circuit is connected with filtering capacitor C2, described filtering capacitor C2 is in series with electronic filter circuit, described electronic filter comprises fet Q1, be parallel to the resistance R 3 of the fet D-G utmost point, be series at the resistance R 5 of the fet S utmost point, be parallel to capacitor C 3 and the resistance R 4 of the fet G utmost point and resistance R 5 right-hand members.

Fet Q1 in described electronic filter can use double pole triode to substitute.

Particularly, as shown in Figure 1, comprise for the capacitive reactance current limliting of LED light source and the power supply of electronic filtering the capacitive reactance current limliting module being connected with alternating current input power supplying, described capacitive reactance current limliting module comprises the capacitive reactance current limiting capacitance C1 being connected with alternating current input power supplying, and the two ends of described capacitive reactance current limiting capacitance C1 are parallel with bleeder resistance R1.

The output of described capacitive reactance current limliting module is electrically connected with rectification filtering module, the filter circuit of galvanic positive and negative end after described rectification filtering module comprises rectification circuit and is connected in parallel on rectification, described rectification circuit comprises the bridge rectifier being made up of diode D1, D2, D3 and D4; Described filter circuit comprises filtering capacitor C2, and the two ends of described filtering capacitor C2 are parallel with bleeder resistance R2.

The output of described rectification filtering module is electrically connected with electronic filter circuit, described electronic filter circuit comprises fet Q1, described fet Q1 circuit is connected with R3, C3, the low fluctuation benchmark control signal source circuit of R4 composition, described low fluctuation benchmark control signal source circuit comprises the resistance R 3 that is connected between described fet Q1 grid and drain electrode, with described output current adjusting resistance R5 with R5 right-hand member Q1 grid capacitor C 3 bleeder resistance R4 in parallel.

The output of described electronic filter circuit is connected with the power supply circuits of at least one LED lamp pearl; In the present embodiment, the output of described electronic filter circuit is in series with (1-N) individual LED lamp.

Q1 fet in this enforcement can be used the double pole triode for meeting voltage, current requirements instead, both pin corresponding relations be D extremely to the C utmost point, S extremely to the E utmost point, G extremely to the B utmost point, after using instead, can suitably strengthen the capacity of C3.

The course of work of the present utility model is: alternating current is entering after circuit, first through being connected on the capacitor C1 in circuit, the filtering capacitor C2 of direct current positive and negative end after entering rectification circuit (D1～D4) obtain current limliting under the stopping of capacitor C1 capacitive reactance after and being connected in parallel on rectification, make the powerful pulsating current that changes direct current into obtain filtering capacitor C2 buffering and simple filtering, again through being connected on the electronic filter circuit in circuit electronicsinterrupted serious pulsating current is processed into level and smooth consistent stabling current by filter circuit, for LED light source provides good drive current.

Operation principle of the present utility model is: first utilize its capacitive reactance to stop current limliting to input current by being connected on rectification circuit capacitor C 1 before, due to the capacitor C1 characteristic of response fast, the turn on process time, very short electric current was very large, if directly supply with the power supply of LED lamp after rectification, will shine into serious impact to LED lamp, directly affect working life, and the bright dark duty ratio of LED lamp while lighting is very little, makes the light stroboscopic that sends very serious.Therefore, the utility model is provided with a conventional capacitive filter C2 after rectification, paired pulses electric current carries out the simple filtering processing of the first order, because this conventional filter circuit C2 cannot eliminate the pulse current that duty ratio is very little, so be provided with again second level electronic filter, rely on the powerful filter function of electronic filter that very serious pulse direct current Current Control is become to level and smooth consistent stable DC electric current, export to LED lamp, make LED lamp reach the stabilized illumination object without stroboscopic or faint stroboscopic.

Because components and parts that the utility model adopts are few, can conveniently be produced on together with LED light source is integrated, reduce production link, thereby further reduce costs, due to the production in enormous quantities increase qualification rate that is also conducive to simple in structure; Play good help to improving the quality of overall light fixture.

As shown in Figure 2, explosive view in kind of the present utility model, in figure, comprises light source board 1, and described light source board 1 is provided with circuit layout, and LED lamp 4 distributing installations are on light source board 1, and all LED lamps 4 connect by circuit; Protective cover 2 is screwed on light source board 1, is evenly distributed four screws and fixes, and effect is the electronic devices and components of protection the inside; Described screw external screw thread is connected with internal thread on fixture 3 by the through hole on light source board 1, and same four through holes are distributed on light source board 1; Described fixture 3 plays fixation, and fixture 3 itself also has certain magnetic; All components and parts are all arranged on light source board 1, comprise field effect transistor 6, diode 7, electric capacity 8 and fuse 5 etc., all connect with welding manner.

The component parameter value of the LED light source plate of driving 10W power is as follows: C1-2.7 μ F/400V; C2-47 μ F/100V; C3-1 μ F/6.3V; R1, R2-620K Ω; R3-330K Ω; R4-510K Ω; R5-28 Ω; Q1-1N60; D1～D4-1N4007; Fuse F1-1A; D5～Dn-0.5W, 20.

Drive component parameter value C1, D1～D4, C2, the Q1 of LED light source plate more than 10W suitably to strengthen, R4 will suitably reduce.

Drive component parameter value C1, D1～D4, C2, the Q1 of the LED light source plate below 10W suitably to reduce, r5to suitably strengthen.

The operational voltage value of capacitor C 1, fet Q1 is greater than civil power maximum working voltage more than 1.5 times, the operating current of fet Q1 is greater than in circuit LED way circuit electric current in parallel more than 2 times, and the operating voltage of capacitor C 2 is greater than maximum the more than 1.2 times of series voltage of LED luminous tube.

More than show and described general principle of the present utility model, principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; that in above-described embodiment and specification, describes just illustrates principle of the present utility model; do not departing under the prerequisite of the utility model spirit and scope; the utility model also has various changes and modifications; these changes and improvements all fall within the scope of claimed the utility model, and the claimed scope of the utility model is defined by appending claims and equivalent thereof.

Claims

1. for the capacitive reactance current limliting of LED light source and the power supply of electronic filtering, it is characterized in that: comprise alternating current input power supplying, described alternating current input power supplying is connected with rectification circuit, between described rectification circuit and described alternating current input power supplying, be in series with capacitor C1, described rectification circuit is connected with filtering capacitor C2, and described filtering capacitor C2 is in series with electronic filter circuit; Described electronic filter comprises fet Q1, be parallel to the resistance R 3 of the fet D-G utmost point, be series at the fet S utmost point resistance R 5, be parallel to the fet G utmost point andthe capacitor C 3 of resistance R 5 one end and resistance R 4.

2.capacitive reactance current limliting for LED light source as claimed in claim 1 and the power supply of electronic filtering, is characterized in that: described electronic filter comprises double pole triode.