CN202335040U

CN202335040U - Separate-excitation type half-bridge driving energy-saving lamp

Info

Publication number: CN202335040U
Application number: CN2011204976363U
Authority: CN
Inventors: 杨忠志
Original assignee: JIANGSU SHINUO LIGHTING CO Ltd
Current assignee: JIANGSU SHINUO LIGHTING CO Ltd
Priority date: 2011-12-05
Filing date: 2011-12-05
Publication date: 2012-07-11
Anticipated expiration: 2021-12-05

Abstract

The utility model relates to lighting equipment, in particular to a separate-excitation type half-bridge driving energy-saving lamp. The separate-excitation type half-bridge driving energy-saving lamp comprises a lamp cap, an electronic ballast, an energy-saving lamp tube and a lamp holder, wherein a control circuit of the electronic ballast is of a separate-excitation type structure as follows: a rectifying circuit, a filtering circuit, a boosting type power factor corrector and a main power switching circuit are connected in sequence between an input and a load, and the filtering circuit, the boosting type power factor corrector and the main power switching circuit are connected with a switching master control module in parallel and are controlled by the switching master control module. According to the utility model, power grid pollution is eliminated, circuit fire is completely eradicated, the problems of stroboflash, insufficient illuminance, abnormal color temperature, color rendering property and the like are solved, and the service life of the separate-excitation type half-bridge driving energy-saving lamp is long and is 5 times that of a self-excitation type ballast fluorescent lamp.

Description

Independent-excited half-bridge driven electricity-saving lamp

Technical field

The utility model relates to a kind of lighting apparatus, especially a kind of independent-excited half-bridge driven electricity-saving lamp.

Background technology

Traditional electric ballast that electricity-saving lamp adopted; Its switch drive mode is the self-excitation type of drive; The origin of auto-excitation type can trace back to four, the electron tube amplifying circuit before the fifties, is simple type type of drive the most original in the drive circuit, and exist two defectives: 1. the stability of auto-excitation type frequency and discreteness are very big; Rate of change is 4.1% in voltage 270-160V scope, and the quality of bulk article is difficult to control; 2. the self-energizing switches circuit always works in the hard switching state, and the switching tube power consumption of this moment strengthens, the temperature rise aggravation, and the stress variation is very easy to damage.

Summary of the invention

The goal of the invention of the utility model is to provide a kind of independent-excited half-bridge driven electricity-saving lamp, substitutes the traditional energy-saving lamp of self-excitation type of drive.

The utility model independent-excited half-bridge driven electricity-saving lamp; It comprises lamp holder, electric ballast, power saving fluorescent lamps, lamp socket; The control circuit of said electric ballast adopts following independent-excited structure; The rectification circuit, filter circuit, boost power factor adjuster, the master power switch circuit that connect in order between input and the load, filter circuit, boost power factor adjuster and master power switch circuit and switch main control module walk abreast and connect and controlled by it.

Further, said switch main control module is the independent-excited structure, accepts power factor detection signal, power factor correction switch signal, voltage detection signal and two-way oscillation switch signal and to the transmission and the control of this signal.

The utility model has following advantage compared with prior art:

1. the utility model electricity-saving lamp employing collection power factor corrector, ballast and bridge driver are the independent-excited electric ballast drive circuit of one.Inner power factor corrector circuit can obtain High Power Factor with critical conduction mode work, low total harmonic distortion and current/voltage adjustment, master control module controls circuit.Its input voltage range is 110～250V, input power factor greater than 95% low harmonics distortion less than 2%.It has not only improved power factor and has reduced total harmonic distortion, has solved the problem of electric network pollution, and has practiced thrift the energy.

2. the utility model electricity-saving lamp can not produce current harmonics, has eliminated electric network pollution, has stopped circuit fire ground and has taken place.

3. the utility model electricity-saving lamp has solved that stroboscopic, illumination are not enough, colour temperature is undesired and problem such as color rendering; Avoided the generation of adolescent myopia; Solved when starting the noise that the electromagnetic interference to indoor tv machine, videocorder, microcomputer produces, solved electromagnetic radiation that the auto-excitation type ballast produces harm human body.

4. the utility model electricity-saving lamp has solved because of line voltage and has crossed the problem that low illuminating lamp can not start, and its long service life is 5 times of auto-excitation type ballast fluorescent lamp useful life.

Description of drawings

Fig. 1 is the circuit block diagram of electric ballast in the utility model;

Fig. 2 is the control circuit structure principle chart of electric ballast in the utility model;

Fig. 3 is boost power factor adjuster 3 sketch mapes of electric ballast in the utility model;

Fig. 4 is the control circuit simplified structure sketch map of electric ballast in the utility model;

Among the figure, rectification circuit 1, filter circuit 2, boost power factor adjuster 3, master power switch circuit 4, switch main control module 5, load 6.

Embodiment

Consult Fig. 1-Fig. 4; A kind of independent-excited half-bridge driven electricity-saving lamp; It comprises lamp holder, electric ballast, power saving fluorescent lamps, lamp socket, and the control circuit of said electric ballast adopts following independent-excited structure, the rectification circuit 1, filter circuit 2, boost power factor adjuster 3, the master power switch circuit 4 that connect in order between input and the load 6; Filter circuit 2, boost power factor adjuster 3 and master power switch circuit 4 and 5 parallel connections of switch main control module, and controlled by it.

Boost power factor adjuster 3 provides the power factor detection signal for the switch main control module.Switch main control module 5 is the independent-excited structure, accepts power factor detection signal, power factor correction switch signal, voltage detection signal and two-way oscillation switch signal and to the transmission and the control of this signal.

During operation: power factor correction is the major function of PFC5 in this circuit; Active boost power factor adjuster 3 in it is to AC-input voltage; Produce and exchange input current; At the boost power factor adjuster 3 (like Fig. 3) of critical conduction mode (CCM), also promptly in each switch periods of PFCMOSFET, circuit waits always and just opens PFCMOSFET when by the time inductor current discharges into zero once more.The switching frequency of PFCMOSFET (＞10KHZ) much larger than mains frequency (50-60HZ).When switching tube MPFC opened, inductor LPFC received the anode (+) and the negative terminal (-) of rectification output, and the LPFC electric current is linear to be increased.When MPFC turn-offed, LPFC was connected in the anode and the dc-link capacitance device of rectification output; Through diode DPFC, the current direction CBUS among the LPFC.Because MPFC is with high-frequency work, CBUS voltage is charged to specific voltage.Feedback loop is adjusted to fixed value through the service time of continuous detecting DC bus-bar voltage and corresponding adjusting MPFC with voltage.If DC voltage rising, then service time reduces, if direct voltage descends, then service time increases.Because this negative feedback control is low speed and low gain, so the inductor average current follows the low frequency line voltage smoothly, thus realization High Power Factor and low total harmonic distortion.At a plurality of line voltage in the cycle; The service time of MPFC is fixed; Because service time is fixed; Turn-off time is discharged into zero decision by the electric current of inductor, and the result is that the frequency of system can freely change, and continuously near the lower frequency of the high-frequency transition the alternating voltage zero-crossing when alternating voltage reaches peak value.

During alternating voltage low excessively (zero cross near), inductive current is raised to minimum value, and discharge is very fast, so switching frequency is high.During near alternating voltage higher (peak value), inductive current is raised to higher value, and discharge time is longer, and frequency is lower.Triangle PFC inductive current is produced simple sinusoidal alternating current by the E-MI filter smoothing.The PFC5 control circuit: with inner 4V voltage is reference, regulates the adjustment that VBUS realizes DC bus-bar voltage.Feedback loop is the conduction adjustable amplifier.Its filling or draw the capacitor of the outside COMP pin of current direction.The voltage of COMP pin is the threshold values of internal capacitor C1 charging, the service time of decision MPFC.The ballast preheating with trigger during, Amplifier Gain is set higher, gives the bus capacitor quick charge, reduces to occur in the transient impact of the dc-link capacitance device during the triggering.At run duration, lower level is adjusted in gain, obtains High Power Factor and low total harmonic distortion.

The MPFC turn-off time is decided by that LPFC discharges into for zero time.By the L that is connected to the ZX pin.Secondary side winding detects zero current.Turn-off time starts from the rising edge above inside circuit 2V threshold values.When the LPFC inductor current discharged into zero, the turn-off time terminated in the threshold values trailing edge that is lower than inside circuit 1.7V, and MPFC is open-minded once more thereupon.This process indefinite period ground repeats, and breaks down and closes PFC function (fault mode) up to ballast.If DC bus-bar voltage overvoltage or under-voltage, or the ZX pin do not detect the decline negative edge, and Mnc will keep turn-offing, and force MPFC open-minded up to timer internal, and service time is by the voltage decision of COMP pin.The every 400ms of timer pulse irregularly takes place, and correct rising and falling edges signal occurs up to the ZX pin, till the PFC operate as normal.

Claims

1. independent-excited half-bridge driven electricity-saving lamp; It comprises lamp holder, electric ballast, power saving fluorescent lamps, lamp socket; It is characterized in that: the control circuit of said electric ballast adopts following independent-excited structure; The rectification circuit (1), filter circuit (2), boost power factor adjuster (3), the master power switch circuit (4) that connect in order between input and the load (6), filter circuit (2), boost power factor adjuster (3) and master power switch circuit (4) and switch main control module (5) walk abreast and connect and controlled by it.

2. independent-excited half-bridge driven electricity-saving lamp as claimed in claim 1; It is characterized in that: said switch main control module (5) is for the independent-excited structure, accepts power factor detection signal, power factor correction switch signal, voltage detection signal and two-way oscillation switch signal and to the transmission and the control of this signal.