CN203136231U

CN203136231U - DC lighting power supply system

Info

Publication number: CN203136231U
Application number: CN 201320109876
Authority: CN
Inventors: 黄良洪; 黄鹏云
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-03-12
Filing date: 2013-03-12
Publication date: 2013-08-14
Anticipated expiration: 2023-03-12

Abstract

The utility model relates to the technical field of a lighting system and particularly relates to a DC lighting power supply system, which comprises a plurality of electronic ballasts connected with loads, a three-phase rectifier filter circuit and a pulse width modulation (PWM) voltage stabilizing circuit. The three-phase AC of the power grid is rectified by the three-phase rectifier filter circuit to be formed as the DC with more ripple components. Then the DC with more ripple components is subjected to the treatments of pulse width modulating and choke inductance smoothing by means of the PWM voltage stabilizing circuit to be served as the pure DC shared by the plurality of electronic ballasts. According to the technical scheme of the utility model, the original three-phase AC power supply is reformed as the pure DC power supply in the combination mode of "three-phase rectifying, PWM control and voltage stabilizing". Especially for lighting reform schemes in specific places, a user only needs to place the three-phase rectifier filter circuit and the PWM voltage stabilizing circuit in a control cabinet for further connection or reformation. Namely, the above single rectifier filter circuit is adopted instead of rectifier filter circuits adopted in a plurality of electronic ballasts in the original three-phase AC power supply system, so that the re-wiring operation is no longer needed. Meanwhile, the DC lighting power supply system has the advantages of simple structure, less parts, strong stability, and great popularization and application value.

Description

A kind of dc lighting electric power system

Technical field

The utility model relates to the illuminator technical field, especially a kind of dc lighting electric power system.

Background technology

At present, a large amount of electricity-saving lamp, LED lamp, fluorescent lamp, HID lamps of using throw light in occasions such as town road, megastore, stadium, underground garage, and these light sources all must be equipped with corresponding alternating current minor or inductance type ballast, driving power could use.

In existing electric power system design or track remodelling engineering, factors such as, complex structure big in view of the cost height of ballast, volume and reliability are low, the power supply plan of most of employing low power factor is the Alternating Current Power Supply scheme, and the driving power of these electric ballasts generally consists of the following components, as shown in Figure 1: 1, power input filtering part, to prevent from disturbing electrical network; 2, bridge rectifier part is to be converted to direct current with interchange; 3, power factor correction pfc circuit part is to improve the power utilization rate; 4, filter circuit part; 5, high-frequency conversion circuit part; 6, choke circuit part.Thus, line construction complexity, cost height, poor reliability, efficient are low.And some adopt the power supply plan of low power factor, the total harmonic wave of its electric current is all in (the total harmonic wave of lighting criteria rated current is lower than 10% for qualified) more than 10%, cause electrical network by severe contamination, main cause is that the alternating current of electrical network 220V/50HZ becomes the pulsating direct current of 100HZ behind over commutation, wave circuit becomes the littler direct current of pulsation after filtration again, can use after sending into high-frequency conversion circuit again.And after the electrochemical capacitor filtering that adds, electrical network just being become to be rendered as capacitive load, the electric current on the electrical network is with regard to leading voltage; So power factor is extremely low, total harmonic wave is higher.

Simultaneously, uneven if threephase load distributes if whole electric power system adopts the Alternating Current Power Supply of three-phase four-wire system, certain phase 220V voltage is just uneven, thereby it is low and then cause the damage phenomenon of illumination or other electric equipment products easily the high phase voltage of a phase voltage to occur.

In addition, the journal article " a kind of dc bus formula HID electric ballast and system thereof " that " electrotechnics journal " November in 2004 the 19th, the volume o. 11th disclosed has proposed a kind of novel circuit structure, as shown in Figure 2: namely replace current rectifying and wave filtering circuit in a plurality of integral type ballasts with a total straightening and filtering unit, replace traditional alternating current input power supplying line supply power mode with DC bus powered mode, it also is a kind of beneficially altering to the conventional AC supply power mode, but because it adopts the phased A that makes of controllable silicon in concrete scheme, B, C three-phase input end current/voltage is discontinuous, electrical network is produced serious disturb (as the oscillogram among Fig. 2), thereby make that the pulsation of electric ballast output current voltage is bigger, export not steady, cause lamp stroboscopic phenomenon to occur easily, shorten the useful life of lamp.

The utility model content

At above-mentioned the deficiencies in the prior art, the purpose of this utility model is to provide a kind of dc lighting electric power system that the three-phase alternating current power supply is changed into the pure direct current supply of " three phase rectifier+PWM control+voltage stabilizing " pattern.

To achieve these goals, the utility model adopts following technical scheme:

A kind of dc lighting electric power system, it comprises a plurality of electric ballasts that are connected with load, it also comprises a three phase rectifier filter circuit and a PWM voltage stabilizing circuit, the three-phase alternating current of electrical network forms the bigger direct current of ripple component after the rectification of described three phase rectifier filter circuit, provide shared pure direct current for a plurality of electric ballasts again after described PWM voltage stabilizing circuit carries out PWM pulse-width modulation, the flat ripple of chokes, voltage stabilizing.

It comprises a plurality of electric ballasts that are connected with load, it is characterized in that: it also comprises a three phase rectifier filter circuit and a PWM voltage stabilizing circuit, the three-phase alternating current of electrical network forms the bigger direct current of ripple component after described three phase rectifier filter circuit low frequency filtering, rectification, provide shared pure direct current for a plurality of electric ballasts again after described PWM voltage stabilizing circuit chokes, voltage stabilizing.

Preferably, described three phase rectifier filter circuit comprises filter circuit and rectification circuit, and described filter circuit is connected between electrical network and the rectification circuit; Described filter circuit is LC-type filter circuit, and described rectification circuit is the three-phase bridge rectifier circuit of being made up of six diodes.

Preferably, described PWM voltage stabilizing circuit comprises field effect transistor Q1, sustained diode 7, choke induction L1, high-frequency filter capacitor C5 and drives chip; Described field effect transistor Q1 is connected in the positive pole of three phase rectifier filter circuit institute output DC, driving chip in parallel between its grid and the source electrode; The source electrode of described field effect transistor Q1 is exported direct current, is connected galvanic negative pole by sustained diode 7 by choke induction L1 respectively, and described choke induction L1 connects galvanic negative pole by high-frequency filter capacitor C5.

Preferably, also be parallel with antistatic resistance R 1 between the grid of described field effect transistor Q1 and the source electrode.

Preferably, be connected with dc filter capacitor C4 between described three phase rectifier filter circuit and the PWM voltage stabilizing circuit.

Owing to adopted such scheme, the utility model changes former three-phase alternating current power supply into the pure direct current supply of " three phase rectifier+PWM control+voltage stabilizing " pattern, especially for the lighting retrofit of particular place, three phase rectifier filter circuit and PWM voltage stabilizing circuit be placed on to be connected in the control cubicle or to transform get final product, namely can replace the current rectifying and wave filtering circuit in a plurality of electric ballasts in the former three-phase alternating current power supply with a total current rectifying and wave filtering circuit, need not rewiring, it is simple in structure, part is few, stability is strong, has very strong application value.

Description of drawings

Fig. 1 is the theory diagram of available technology adopting ac power supply method;

Fig. 2 is for having the controllable silicon phase control rectifier main circuit diagram of stage oscillogram in the prior art;

Fig. 3 adds the theory diagram of PWM voltage stabilizing for the three phase rectifier of the utility model embodiment;

Fig. 4 adds the main circuit diagram of PWM voltage stabilizing for the three phase rectifier that has the stage oscillogram of the utility model embodiment.

Embodiment

Below in conjunction with accompanying drawing embodiment of the present utility model is elaborated, but the multitude of different ways that the utility model can be defined by the claims and cover is implemented.

As shown in Figure 3 and Figure 4, a kind of dc lighting electric power system that the utility model provides, it comprises a plurality of electric ballasts that are connected with load, it also comprises a three phase rectifier filter circuit 1 and a PWM voltage stabilizing circuit 2, the three-phase alternating current of electrical network forms the bigger direct current of ripple component after 1 rectification of three phase rectifier filter circuit, provide shared pure direct current for a plurality of electric ballasts again after PWM voltage stabilizing circuit 2 carries out PWM pulse-width modulation, the flat ripple of chokes, voltage stabilizing.

Wherein, three phase rectifier filter circuit 1 comprises filter circuit 11 and rectification circuit 12, and filter circuit 11 is connected between electrical network and the rectification circuit 12.Filter circuit 11 is LC-type filter circuit, and its circuit connecting form is: each output line terminal of the three-phase alternating current in the electrical network connects an inductance (being L1, L2, L3) respectively and is connected with an electric capacity (being C1, C2, C3) each other.And rectification circuit 12 (is the three-phase bridge rectifier circuit of D1～D6) form by six diodes.In addition, for make after the rectification dc waveform more steadily and the filtering clutter, between three phase rectifier filter circuit 1 and PWM voltage stabilizing circuit 2, be connected with dc filter capacitor C4, after rectification, do not need to obtain comparatively pure direct current at the extra filter circuit construction of adding with this.

And PWM voltage stabilizing circuit 2 comprises field effect transistor Q1, sustained diode 7, choke induction L1, high-frequency filter capacitor C5 and drives chip; Field effect transistor Q1 is connected in the positive pole of 1 output DC of three phase rectifier filter circuit, is parallel with the driving chip 21 of realizing pulse-width modulation between its grid and the source electrode; The source electrode of field effect transistor Q1 is exported direct current, is connected galvanic negative pole by sustained diode 7 by choke induction L1 respectively, and choke induction L1 connects galvanic negative pole by high-frequency filter capacitor C5; Simultaneously, also be parallel with antistatic resistance R 1 between the grid of field effect transistor Q1 and the source electrode; Thus, the big direct current of three-phase alternating current formed pulsation after low frequency filtering, rectification has formed pure direct current again after step-down, chokes and filtering.

Be example with the HID electric ballast, itself generally include half-bridge high-frequency inverter circuit 3, high frequency choke inductive circuit 4 and regulation and control, protective circuit 5, all be formed with by power input filtering part in each load thereby make in former three-phase alternating current power supply (as shown in Figure 1) scheme, the bridge rectifier part, power factor correction pfc circuit part, the filter circuit part, the high-frequency conversion circuit part, the power supply circuits that the choke circuit part constitutes, circuit structure is very complicated, the dc lighting electric power system of present embodiment provides total current rectifying and wave filtering circuit of a kind of usefulness to replace a plurality of current rectifying and wave filtering circuits in a plurality of electric ballasts, circuit in the load only needs high-frequency conversion circuit part and choke circuit part, it is simple in structure, part is few, stability is strong, especially in the power supply engineering transformation process of specific occasion, need not rewiring, only need be placed on the three phase rectifier filter circuit 1 in the present embodiment and PWM voltage stabilizing circuit 2 to be connected in the control cubicle or to transform and get final product; Be example with the three-phase four-wire power supply form, original 220V/50HZ Alternating Current Power Supply will be changed into present three phase rectifier+PWM control+400V/DC voltage stabilizing and form pure direct current supply, it is just passable only to need that former control cubicle output to four lines of load are integrated the formation two-wire system; Simultaneously, owing to power supply is exported at control cubicle namely to form direct current supply, so reduced the loss of electric energy in course of conveying.

At different loads, the dc lighting electric power system of present embodiment can adopt different connections or forms of modification, as: the ballast at electricity-saving lamp, fluorescent lamp only needs bus 400V/DC, adding the direct powered lighting of current-limiting inductance after the high frequency conversion of ballast gets final product, saved complicated change-over circuit, and the energy consumption after improving can reduce 20-50%; At the application of LED illumination, only need the DC/DC constant-current circuit to get final product, saved all multicomponent devices of conventional AC driven power, reduced cost, reliability strengthens, and also further prolong the useful life of light fixture.

The above only is preferred embodiment of the present utility model; be not so limit claim of the present utility model; every equivalent structure or equivalent flow process conversion that utilizes the utility model specification and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present utility model.

Claims

1. dc lighting electric power system, it comprises a plurality of electric ballasts that are connected with load, it is characterized in that: it also comprises a three phase rectifier filter circuit and a PWM voltage stabilizing circuit, the three-phase alternating current of electrical network forms the bigger direct current of ripple component after the rectification of described three phase rectifier filter circuit, provide shared pure direct current for a plurality of electric ballasts again after described PWM voltage stabilizing circuit carries out PWM pulse-width modulation, the flat ripple of chokes, voltage stabilizing.

2. a kind of dc lighting electric power system as claimed in claim 1, it is characterized in that: described three phase rectifier filter circuit comprises filter circuit and rectification circuit, described filter circuit is connected between electrical network and the rectification circuit; Described filter circuit is LC-type filter circuit, and described rectification circuit is the three-phase bridge rectifier circuit of being made up of six diodes.

3. a kind of dc lighting electric power system as claimed in claim 1 or 2 is characterized in that: described PWM voltage stabilizing circuit comprises field effect transistor (Q1), fly-wheel diode (D7), choke induction (L1), high-frequency filter capacitor (C5) and drives chip; Described field effect transistor (Q1) is connected in the positive pole of three phase rectifier filter circuit institute output DC, driving chip in parallel between its grid and the source electrode; The source electrode of described field effect transistor (Q1) is exported direct current, is connected galvanic negative pole by fly-wheel diode (D7) by choke induction (L1) respectively, and described choke induction (L1) connects galvanic negative pole by high-frequency filter capacitor (C5).

4. a kind of dc lighting electric power system as claimed in claim 3 is characterized in that: also be parallel with antistatic resistance (R1) between the grid of described field effect transistor (Q1) and the source electrode.

5. a kind of dc lighting electric power system as claimed in claim 4 is characterized in that: be connected with dc filter capacitor (C4) between described three phase rectifier filter circuit and the PWM voltage stabilizing circuit.