CN201830533U - Active power factor correction (PFC) energy-saving lamp - Google Patents

Abstract

The utility model discloses an energy-saving lamp which is high in power factor and adopts an active PFC circuit, comprising an EMC (Electro Magnetic Compatibility) suppression circuit, a full-wave rectifier, the active PFC circuit, a filter circuit and a voltage feed type half-bridge inverter circuit, which are connected in sequence. A controller used in the active PFC circuit is L6562.

Description

A kind of Active Power Factor Correction electricity-saving lamp

Technical field

The utility model relates to a kind of light fixture, particularly a kind of electricity-saving lamp of novel employing Active Power Factor Correction.

Background technology

Because of global energy day is becoming tight, unremitting effort is all being made for seeking novel energy in each countries and regions.Especially relating to huge numbers of families' indoor and outdoor lighting class light source and auxiliary products thereof is subjected to national governments especially and shows great attention to.

Electricity-saving lamp has the 170V-250V wide operating voltage, is fit to Chinese power demands; Long-life, average life 〉=8000 hour; Noiselessness, no stroboscopic, to communication, advantage such as domestic electric appliance is noiseless, the trend that electricity-saving lamp is promoted is also just arisen at the historic moment.

In addition, along with the continuous development of power electronic technology, increasing switching power unit is widely used in various field, makes Switching Power Supply to the influence of electrical network, and seeming as degradation problem under harmonic pollution and the input power factor becomes increasingly conspicuous.For reducing harmonic pollution and the electromagnetic interference of device, corresponding harmonic suppressing method and circuit of power factor correction have been proposed to electrical network.Circuit of power factor correction generally is divided into Active Power Factor Correction (APFC) and PPFC (Passive Power Factor Correction) (PPFC).Traditional passive alignment technique is to increase the rectifier bridge angle of flow with the LC filter in rectification circuit, improves power factor thereby reduce current harmonics.PPFC (Passive Power Factor Correction) has replaced the higher active device of price owing to components and parts such as adopting inductance, electric capacity, diode, thereby the cost of Switching Power Supply is reduced.But PPFC (Passive Power Factor Correction) also exists such as crest factor and the more high technical problem of harmonic content, and the even-order harmonic problem that exists in particularly traditional passive power factor correcting circuit is so it is badly in need of further improving.At present traditional electricity-saving lamp all adopts the passive power factor correcting circuit design, and this circuit exists that power factor is low, harmonic content big, power is along with the fluctuation of line voltage, changes shortcomings such as bigger.Country and industry standard that requirements at the higher level are arranged can not have been satisfied.In recent years, the use of the circuit of Active Power Factor Correction in national life more and more widely particularly advocated " green power supply " now, and claimed apparatus is pollution-free to electrical network, mainly comprises harmonic content, power factor, wave distortion etc.

Summary of the invention

The utility model is at prior art problems, provides a kind of employing circuit of power factor correction of having chance with, the high electricity-saving lamp of power factor.

In order to solve the problems of the technologies described above, the utility model is achieved through the following technical solutions:

A kind of Active Power Factor Correction electricity-saving lamp, comprise that the EMC electromagnetic compatibility suppresses circuit, full-wave rectifier, PFC APFC, filter circuit, voltage feed type half-bridge inversion circuit, described EMC electromagnetic compatibility inhibition circuit, full-wave rectifier, PFC APFC, filter circuit, voltage feed type half-bridge inversion circuit connect successively, it is characterized in that used controller is L6562 in the described PFC APFC.

A kind of Active Power Factor Correction electricity-saving lamp, described PFC APFC is made up of resistance R 21～R28, metal-oxide-semiconductor Q, capacitor C 21, C22 and IC, wherein IC is integrated circuit controller L6562, resistance R 21 1 ends connect full-wave rectifier, one end connects resistance R 22, the other end of resistance R 22 connects resistance R 23, capacitor C 22 and IC, resistance R 23, capacitor C 22 be connected in parallel IC and ground connection; Resistance R 24～R26 series connection, an end connects filter circuit, and the other end connects IC and capacitor C 21, and the other end of C21 connects IC; The grid of metal-oxide-semiconductor Q is connected with resistance R 27, and resistance R 27 connects IC, and the source electrode of metal-oxide-semiconductor Q connects IC, and the drain electrode of metal-oxide-semiconductor Q is connected with filter circuit.

Obviously, the beneficial effects of the utility model are, adopt power factor controller L6562, and all kinds of parameter indexs of light fixture have obtained very big lifting.Power factor is brought up to more than 0.98, and total harmonic distortion is lower than 2.5%, meets IEC61000-3-2 harmonic current limitation standard.

Description of drawings

Fig. 1 is a theory diagram of the present utility model;

Fig. 2 is a PFC APFC of the present utility model;

Fig. 3 is the utility model PFC APFC MOS terminal circuit schematic diagram;

Fig. 4 is a voltage feed type half-bridge inversion circuit of the present utility model.

Embodiment

For further setting forth the utility model is to reach technological means and the effect that predetermined purpose is taked, below in conjunction with accompanying drawing and preferred embodiment, describe in detail as after.

At present traditional electricity-saving lamp all adopts the passive power factor correcting circuit design, and this circuit exists that power factor is low, harmonic content big, power is along with the fluctuation of line voltage, changes shortcomings such as bigger.In order to overcome above-mentioned deficiency, the electricity-saving lamp that the utility model provides a kind of employing to have chance with circuit of power factor correction.The positive way that addresses this problem is to adopt power factor correction (Power Factor Correction, PFC) technology.In order to make light fixture when satisfying harmonic standard, can realize low cost, high-performance, more and more urgent to the demand of single-stage PFC, particularly in the bigger country of electric load.Can realize low cost, high-performance when satisfying IEC 61000-3-2 harmonic standard, more and more urgent to the demand of single-level power factor correction technology (PFC).The power factor controller L6562 that this light fixture adopts company of STMicw Electronics (SGS-THOMSON) to release designs.All kinds of parameter indexs of light fixture have obtained very big lifting.Power factor is brought up to more than 0.98, and total harmonic distortion is lower than 2.5%, meets IEC61000-3-2 harmonic current limitation standard.

As shown in Figure 1, be the utility model theory diagram of the present utility model.

A kind of Active Power Factor Correction electricity-saving lamp, comprise that the EMC electromagnetic compatibility suppresses circuit 1, full-wave rectifier 2, PFC APFC 3, filter circuit 4, voltage feed type half-bridge inversion circuit 5, described EMC electromagnetic compatibility inhibition circuit 1, full-wave rectifier 2, PFC APFC 3, filter circuit 4, voltage feed type half-bridge inversion circuit 5 connect successively, and used controller is L6562 in the described PFC APFC 3.

Fig. 2 is a PFC APFC of the present utility model, Fig. 3 the utility model PFC APFC MOS terminal circuit schematic diagram.

As shown in the figure, PFC APFC 3 is made up of resistance R 21～R28, metal-oxide-semiconductor Q, capacitor C 21, C22 and IC, wherein IC is integrated circuit controller L6562, resistance R 21 1 ends connect full-wave rectifier 2, one end connects resistance R 22, the other end of resistance R 22 connects resistance R 23, capacitor C 22 and IC, resistance R 23, capacitor C 22 be connected in parallel IC and ground connection; Resistance R 24～R26 series connection, an end connects filter circuit 4, and the other end connects IC and capacitor C 21, and the other end of C21 connects IC; The grid of metal-oxide-semiconductor Q is connected with resistance R 27, and resistance R 27 connects IC, and the source electrode of metal-oxide-semiconductor Q connects IC, and the drain electrode of metal-oxide-semiconductor Q is connected with filter circuit 4.

In the power electronic equipment that contains the AC/DC converter, power supply generally is to obtain comparatively straight direct voltage by electric main behind rectification and big capacitor filtering, rectifier-capacitor filter is the combination of a kind of non-linear component and energy storage component, therefore, though input ac voltage is sinusoidal, and the input AC electric current is that a time is very short, the periodicity peak current that peak value is very high, if waveform seriously distorts. remove input filter capacitor, then input current becomes approximate sine wave, improve the power factor of input side and reduced input current harmonics, but the output of rectification circuit no longer is a level and smooth VD, and becomes pulsating wave.If it is sinusoidal wave desiring to make input current, and output still be that level and smooth direct current is exported, and must insert a circuit between rectification circuit and filter capacitor, and this circuit is exactly a pfc circuit.Whether it weighs with the sine wave phase of input voltage is consistent with the waveform shape of phase place between input voltage in the circuit and the input current and input current.Between input current and the input voltage mutually cosine of an angle be defined as power factor (PF), and the shape conformance definition of the shape of input current waveform and input voltage waveform is a total harmonic distortion.In order to realize that this purpose L6562 produces one at AC-input voltage and exchanges input current.The control method that L6562 realizes is for working in critical conduction mode (CCM) boost converter, promptly waits by the time inductive current to discharge into when zero at each switch periods circuit of PFC metal-oxide-semiconductor always, just opens the PFC metal-oxide-semiconductor once more.The switching frequency of PFC metal-oxide-semiconductor (＞10KHz) much larger than the frequency (50-60Hz) of electrical network.

As shown in the figure, when switch MOS pipe (MPFC) when opening, inductance L PFC receive rectifier bridge output+utmost point and-utmost point.The electric current of LPFC is linear to be increased.Current direction CBUS in switch MOS pipe (MPFC).Because switch MOS pipe (MPFC) high-frequency work, CBUS voltage is charged to a specific voltage.The feedback loop of L6562 is adjusted to a fixing value by the service time of continuous detecting DC bus-bar voltage and corresponding by-pass cock metal-oxide-semiconductor (MPFC) with voltage.DC voltage rising, reduce switching time, and direct voltage descends to be increased switching time.This negative feedback control is low speed and low gain.Therefore the average current of inductance (LPFC) is followed the low frequency line voltage smoothly.Thereby High Power Factor and low total harmonic distortion (THD) have been realized.Service time at a plurality of line voltage switch MOS pipe (MPFC) in the cycle shows as fixing.Because service time is fixed, the turn-off time is discharged into zero decision by inductive current.The result is the frequency shift of L6562, and near the lower frequency of the high frequency the continuous alternating voltage zero-crossing when alternating voltage reaches peak value.(zero cross near) inductive current is raised to a smaller value when alternating voltage is low, and discharge is just very fast so.So switching frequency height.When the higher value of alternating voltage, discharge time is also longer, and frequency is lower.Triangular wave PFC inductive current is smoothly produced simple sinusoidal alternating current by electromagnetic interface filter.

Fig. 4 is a voltage feed type half-bridge inversion circuit of the present utility model.

What as shown in the figure, the latter half of light fixture adopted is the voltage feed type half-bridge inversion circuit.The performance simple in structure of entire circuit is stable.Principle is: at first VT2 elder generation conducting.When the VT2 conducting, current direction is :+VDC → C3 → filament FL1 → C5 → filament FL2 → L2 → Tla → VT2 → ground.Electric current charges to C5; When VT2 by and during the VT1 conducting, current path is: C5 → filament FL1 → C3 → VT1 → Tla → L2 → filament FL2 → C5, this current direction is the discharge loop of C5.Positive feedback by means of the elementary winding Tla of pulse transformer TI makes VTI, and the VT2 alternate conduction caused the LC series circuit generation resonance that L2, C3 and C5 form in 0.3 second.Produce the high-voltage pulse of a 600-1200V at the C5 two ends, the lamp igniting is ignited.Before lamp starts, so owing to the resonance of C5＜C3 LC series circuit is mainly determined by the numerical value of C5 and L2.When inverter circuit entered steady operation, operating frequency was by pulse transformer T1 magnetic core size, peakflux density, the elementary winding Tia number of turn, determine jointly across the feedback voltage of Tia and the factors such as memory time of switching transistor.

Obviously the foregoing description is not to restriction of the present utility model, and above-mentioned a kind of Active Power Factor Correction electricity-saving lamp can also have other many variations.Though gone through the utility model in conjunction with above-mentioned example, some that should be understood that professional person in the industry can expect apparently are identical, and alternative scheme all falls within the protection range that the utility model claim limited.

Claims (2)

1. Active Power Factor Correction electricity-saving lamp, comprise that the EMC electromagnetic compatibility suppresses circuit (1), full-wave rectifier (2), PFC APFC (3), filter circuit (4), voltage feed type half-bridge inversion circuit (5), described EMC electromagnetic compatibility inhibition circuit (1), full-wave rectifier (2), PFC APFC (3), filter circuit (4), voltage feed type half-bridge inversion circuit (5) connect successively, it is characterized in that used controller is L6562 in the described PFC APFC (3).

2. Active Power Factor Correction electricity-saving lamp according to claim 1, it is characterized in that, described PFC APFC (3) is made up of resistance R 21～R28, metal-oxide-semiconductor Q, capacitor C 21, C22 and IC, wherein IC is integrated circuit controller L6562, resistance R 21 1 ends connect full-wave rectifier (2), one end connects resistance R 22, and the other end of resistance R 22 connects resistance R 23, capacitor C 22 and IC, resistance R 23, capacitor C 22 be connected in parallel IC and ground connection; Resistance R 24～R26 series connection, an end connects filter circuit (4), and the other end connects IC and capacitor C 21, and the other end of C21 connects IC; The grid of metal-oxide-semiconductor Q is connected with resistance R 27, and resistance R 27 connects IC, and the source electrode of metal-oxide-semiconductor Q connects IC, and the drain electrode of metal-oxide-semiconductor Q is connected with filter circuit (4).

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