WO2009067927A1

WO2009067927A1 - A device for lightening several fluorescent lamps

Info

Publication number: WO2009067927A1
Application number: PCT/CN2008/073039
Authority: WO
Inventors: Chi Wang
Original assignee: Chi Wang
Priority date: 2007-11-19
Filing date: 2008-11-13
Publication date: 2009-06-04
Also published as: CN101160009A

Abstract

A device for lightening several fluorescent lamps includes: an active filter circuit (11), a high frequency rectifier filter circuit (12), a high frequency chopper power output circuit (13) and current phase shift, current limiting, resonance circuits (14,15,16). Fluorescent tube groups are in series with the current phase shift, current limiting, resonance circuits(14,15,16); mains supply is output to high frequency chopper power output circuit (13) through the active filter circuit (11) and high frequency rectifier filter circuit (12) in turn; the high frequency chopper power output circuit (13) provides electric power for two or more thantwo electric current phase shift, current limiting, resonance circuits (14,15,16) which are parallel connected in output loop.

Description

Device for lighting multiple fluorescent lamps

Technical field

The present invention relates to the field of electric light source illumination technology, and more particularly to an apparatus for illuminating a plurality of fluorescent lamps. Background technique

The traditional way to illuminate an electric light source is to determine the input mains voltage, lamp voltage, lamp current, current limit with inductor, capacitor, resistor or electronic ballast, buck, boost, etc. to ensure the electric light source. Start up and work fine.

At present, household electric light sources can be basically divided into three types: ordinary lamps (tungsten lamps), halogen lamps and fluorescent lamps; fluorescent lamps are mainly composed of lamps, starters and ballasts. The working principle of fluorescent tubes is: After the power supply, the voltage is applied between the two poles of the starter to discharge the xenon gas and emit a glow. The heat generated by the glow causes the u-shaped dynamic contact piece to expand and expand, and is connected to the static contact piece, so that the ballast coil is connected. And the filament in the tube has current flowing through it. After the circuit is turned on, the helium gas in the starter stops discharging, the u-shaped film cools and contracts, the two contacts are separated, and the circuit is automatically disconnected. At the moment when the circuit is suddenly disconnected, due to the sharp decrease of the ballast current, a high self-induced electromotive force is generated, and the self-induced electromotive force in the same direction as the original voltage direction is added together with the power supply voltage to form an instantaneous high voltage. At both ends of the tube, the gas in the tube begins to discharge, and the fluorescent lamp becomes a path of current to start to emit light. When the fluorescent lamp starts to emit light, since the alternating current passes through the coil of the ballast, a self-induced electromotive force is generated in the coil, which always hinders the current change. At this time, the ballast acts as a step-down current limiting to ensure the fluorescent lamp. normal work. The ballast generates instantaneous high voltage at start-up, ignites the fluorescent lamp, and works normally. The voltage is reduced and the current is limited; the function of the capacitor in the starter is to avoid sparking. Since the traditional lighting device uses the mains 220V50HZ to directly light through the ballast, in order not to affect the power grid to reduce the line loss, the power factor is increased as much as possible, and the reactive current is reduced, and the fluorescent lamp has a certain lamp voltage. The power, that is, the brightness of the lamp, depends on the current.

Actual working current of several common electric light sources: In the case of grid voltage 220V,

400W high pressure sodium lamp single lamp, working current is 4. 2A.

250W high pressure sodium lamp single lamp, working current is 2. 5A.

Single lamp of 400W metal halide lamp, working current is 3. 8A.

250W metal halide lamp single lamp, working current is 2. 3A.

Inductive ballasts 40W fluorescent lamps, operating current is 0.36A.

Electronic ballast 40W fluorescent lamp single lamp, working current is 0. 18A.

According to the above data, the electric light source consumes electricity in addition to the electric light source itself, and the ballast also consumes electric energy. In addition, most of the manufacturers engaged in the development and production of lighting technology have invested a large amount of manpower, equipment, and funds to study lighting fixtures as pure resistive loads, with little success and not significantly improving energy efficiency.

In the prior art, since most of the commonly used electric light sources have low utilization rate of electric energy and the illumination quality is not high, waste of raw materials and precious energy is caused. Summary of the invention

The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a device capable of illuminating a plurality of fluorescent lamps with low cost, high illumination quality, and energy saving. The technical solution adopted by the invention is: a device for illuminating a plurality of fluorescent lamps, comprising: an active filter circuit, a high frequency rectification filter circuit, a high frequency chopping power output circuit, a current phase shifting, a current limiting circuit, a resonance circuit, a fluorescent lamp tube group is connected in series in the current phase shifting, current limiting, and resonant circuit, and a mains power source is input to the active filter circuit; the active filter circuit outputs the high frequency rectifying filter circuit to the high frequency a positive voltage output end of the rectifier filter circuit is connected to a positive voltage input end of the high frequency chopper power output circuit, and a negative voltage output end of the high frequency rectification filter circuit and the high frequency chopper power output circuit The negative voltage input terminals are connected, and the high frequency chopping power output circuit supplies power to two or more current phase shifting, current limiting, and resonant circuits connected in parallel in the output circuit.

The operating frequency range of the high frequency chopping power output circuit is 40_120KC.

The operating frequency of the high frequency chopping power output circuit is 80KC.

The current phase shifting, current limiting, and resonant circuit are composed of an inductor coil and a fluorescent tube group connected in series, and the fluorescent tube group is composed of a fluorescent tube end-to-end and connected in series, and one of the first end and the tail end of each fluorescent lamp is connected. A capacitor is connected between them.

The fluorescent tube group in the current phase shifting, current limiting, and resonant circuit is composed of 1 to 4 fluorescent tubes.

The current phase shifting, current limiting, resonant circuit and the capacitive load fluorescent lamp form a series resonant circuit, and each of the current phase shifting, current limiting, and resonant circuits have different resonant frequencies, and each series resonant circuit is connected in parallel. The resonant frequency after becoming an integral load is the same as the operating frequency of the high frequency chopping power output circuit.

The invention has the beneficial effects that: the invention adopts a high frequency switching power supply and a current phase shift current limiting resonant circuit, can simultaneously illuminate a plurality of fluorescent lamps, and cancels a plurality of ballasts, At the same time, the glow or multiple electronic ballasts can significantly improve the quality of the illumination, reduce the total amount of input current harmonics, and increase the power factor, thereby saving raw materials and energy.

Using the mains power supply, a power source that is more effectively matched to the electric light source of the commercial power source is used to ignite the electric light source; the electric light source can obtain higher photoelectric conversion efficiency under the premise of using less power; In the case of normal operating voltage, the reactive current is effectively utilized, and the power requirements of the power grid and the mains are met, thereby achieving the effect of energy saving. DRAWINGS

Figure 1 is a block diagram showing the composition of the present invention;

2 is a schematic diagram of a current phase shifting, current limiting, and resonant circuit composed of an inductor coil and a single fluorescent tube of the present invention;

3 is a schematic diagram of a current phase shifting, current limiting, and resonant circuit composed of an inductor coil and a plurality of fluorescent tubes of the present invention.

4 is a circuit diagram of an apparatus for lighting a plurality of sets of fluorescent lamps of the present invention;

In the picture:

PFC: Active Filter Circuit PW: High Frequency Chopper Power Output Circuit

IP: current phase shift, current limit, resonant unit IPi input

IPout: current phase shift, current limit, resonant circuit output

C: Capacitor D: Fluorescent lamp

S: Fluorescent filament connection terminal implementation The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The product of current and voltage VIcos is called active power (unit is W), and the product of current and voltage VI is called apparent power (unit is VA). The ratio of active power to apparent power is called the power factor PF (Power Factor).

PF=W/VA=VAcos Θ /VA = cos θ

Regardless of the active power or reactive power, the generator is supplied by the transmission network and the distribution line, but the electricity meter, gp, and time meter are only the active power part. Active power includes voltage drop and line loss of reactive current in the line. Total current active current 1 1 = 1 ₂ reactive current, if the power factor can effectively reduce the load, the effective use of reactive current to the lighting ₁₂ can achieve the purpose of energy saving. The capacitive load can provide the reactive power required for the inductive load, because the current of the inductive load is behind the terminal voltage, that is, the power factor is hysteresis, and the current of the capacitive load exceeds the front-end voltage, that is, the power factor is advanced. Complementary characteristics.

1 is a schematic block diagram of the present invention. As shown in FIG. 1, the apparatus for lighting a plurality of fluorescent lamps of the present invention comprises: an active filter circuit, a high frequency rectification filter circuit, a high frequency chopper power output circuit, and a current shift. a phase, current limiting, resonant circuit, the current phase shifting, current limiting, resonant circuit is connected in series with a fluorescent tube group, and the mains power is input to the active filter circuit and output to the high frequency rectifying and filtering circuit, a positive voltage output end of the high frequency rectification filter circuit is connected to a positive voltage input end of the high frequency chopper power output circuit, and a negative voltage output end of the high frequency rectification filter circuit and the chopper power output circuit The negative voltage input terminals are connected, and the high frequency chopping power output circuit supplies power to two or more current phase shifting, current limiting, and resonant circuits connected in parallel in the output circuit. The current phase shifting, current limiting, and resonant circuit are composed of an inductor coil and a fluorescent tube group in series, and the fluorescent device The light tube group is composed of a fluorescent tube end-to-end connected in series, and a capacitor is connected between the first end of each fluorescent lamp and one of the end ends of the fluorescent end.

Traditional fluorescent lamps require a one-to-one ballast, starter or electronic ballast to illuminate. There are several fluorescent lamps with several ballasts, starters or several electronic ballasts. This device can illuminate multiple fluorescent lamps in a pair of n. While eliminating n ballasts, starters or n electronic ballasts, it also improves the quality of lighting, reduces the total amount of input current harmonics, improves the power factor, and achieves the goal of saving energy and raw materials. .

The working principle of the invention is as follows: 220V 50Hz or 110V60Hz alternating current, after rectification, high-quality PFC active filter circuit is used to effectively improve the current waveform changed by lighting the fluorescent lamp, basically achieve sine wave, and increase the power factor to 0. 98 or more, and boost the DC voltage to reach the voltage required to illuminate the fluorescent lamp. Under the fluctuation of the mains input voltage of 30%, the DC output voltage of the PFC active filter circuit remains unchanged.

After high-frequency rectification and filtering of the DC voltage, a high-frequency positive-negative symmetrical AC voltage output is obtained after the high-frequency chopper power output circuit is chopped. The basic high-frequency chopping power output circuit can be a half-bridge or a full-bridge. , resonant circuit, etc. Regardless of the type of circuit used, both high-voltage alternating currents with positive and negative half-cycle symmetry are used when loading with fluorescent lamps.

The TO. Π output of the high-frequency chopper power output circuit can simultaneously illuminate two or more sets of fluorescent lamps in parallel. The number of fluorescent lamps that are lit in parallel depends on the output power of the high frequency chopping power output circuit and the power of the fluorescent tube being illuminated. Its calculation method:

The output power of the high frequency chopping power output circuit is W=1. 2Wd.

Wd is the sum of the power of the fluorescent lamps that are illuminated.

2 is a current phase shifting, current limiting, consisting of an inductor coil and a single fluorescent tube of the present invention, Schematic diagram of a resonant circuit, FIG. 3 is a schematic diagram of a current phase shifting, current limiting, and resonant circuit composed of an inductor coil and a plurality of fluorescent tubes according to the present invention; as shown in FIG. 2 and FIG. 3, each group of fluorescent lamps that are lit in parallel may be one. -4, the fluorescent lamps in each group are connected in series, the number of which depends mainly on the peak and peak value of the high-frequency voltage outputted by the high-frequency chopper power output circuit, and the calculation method thereof: the number of fluorescent lamps in each group is n=0. 6Vpp /VD

Vpp: output voltage peak and peak of high frequency chopping power output circuit

VD: tube pressure of a single fluorescent lamp in each set of series connections

The power, tube pressure, and operating current of each group of fluorescent lamps connected in series should be approximately the same. Each group of fluorescent lamps connected in series should be connected in series with the output of the high-frequency chopper power output circuit. A current phase shift, current limit, resonant inductor, current phase shift, current limit, and resonant inductor are used to limit current and phase shift. , resonance.

The invention adopts the traditional inductor to limit current. Because it is a high frequency switching power supply, the frequency of the high frequency chopping power output is as high as several tens of thousands of weeks to hundreds of thousands of cycles, and the current limiting inductor is a high frequency inductor, and the inductive reactance is the same. Its volume and power consumption are significantly reduced compared to the 50 Hz frequency of the mains. It improves energy quality while achieving energy saving.

The circuit of the invention is to change the traditional lighting device. Since the traditional lighting device uses the mains 50Hz to directly light through the ballast, in order not to affect the power grid to reduce the line loss, most of the power factor is improved, and the reactive current is reduced. In the case of a fluorescent lamp, in the case where the lamp voltage is determined, the lamp power, that is, the brightness of the lamp depends on the current flowing through the lamp itself, that is, the greater the current flowing through the lamp itself, the greater the brightness, based on this principle, the present invention The circuit uses a phase shifting device to increase the current flowing through the lamp, BP, without increasing the existing power of the lamp. WD=VD*ID*C0S O.

3⁄43⁄4=lamp active power;

VD = lamp voltage;

ID=lamp current;

C0S D = lamp line power factor.

3, SP, the reactive current is increased by 0.3, the lamp is reduced from 0. 8 to 0. 5, in the case of WD, VD are unchanged, the ID can be increased by 0.3, SP, reactive current increased by 0.3, the light The brightness is increased by 0.3% or 30% when the power is constant. The second effect of phase shifting is to change the phase between the current flowing through the lamp and the output voltage of the high frequency chopping power output circuit. The phase of the lamp current flowing through each group of fluorescent lamps D is different, and the output current of the high-frequency chopper power output circuit is reduced. When the power factor is equal to 0.98, the current input from the high-frequency switching power supply is also reduced, and in each group. The current flowing through the fluorescent lamp does not change, thereby achieving energy saving purposes.

In addition, each group of current phase shifting, current limiting, and resonant circuits connected in parallel at the output of the high frequency chopper power output circuit is composed of a current limiting inductor L, a starting capacitor (and an external capacitor 5, a fluorescent lamp, which constitutes a series resonant circuit, The resonant frequencies are different. The resonant frequency of each series of series resonant circuits connected in parallel to form an overall load is the same as the frequency of the high frequency chopping power output circuit. The output current of the commercial power will decrease in the same time. It is to reduce the output current of the active filter circuit PFC and the high frequency chopping power output circuit while ensuring that the current of each group of D fluorescent lamps is constant, thereby achieving the purpose of energy saving.

The circuit of the invention utilizes an active filter circuit PFC, a high frequency chopping power output circuit and other circuits to form a high frequency switching power supply. The switching frequency is 40KC to 120KC, the best choice is 80KC, and the fluorescent tube group of 2 or more groups is illuminated. 3 is a schematic diagram of a current phase shifting, current limiting, and resonant circuit composed of an inductor coil and a plurality of fluorescent tubes, and FIG. 4 is a circuit diagram of the apparatus for lighting a plurality of fluorescent lamps of the present invention; FIG. 1 to FIG. , the mains 220v50Hz or 110v60Hz power supply and active filter circuit PFC input terminal 1. 2 phase connection, active filter circuit PFC output positive and negative end and high frequency rectification filter circuit positive and negative input terminal, high frequency rectifier circuit output The terminal is connected to the input end of the high frequency chopping power output circuit PW, and the power output terminal TO of the high frequency chopping power output circuit PW is connected to all current phase shifting, current limiting, and input terminal IPin of the resonant circuit IP, current The phase-shifting, current limiting, and output terminals of the resonant unit IP are connected to the filament S1 end of the corresponding fluorescent lamp, and the other end S2 of the filament of the fluorescent lamp is connected to the S3 end of the other set of filaments of the corresponding fluorescent lamp through the capacitor C. The other set of filament S4, that is, current phase shifting, current limiting, and the output terminal of the resonant circuit IPout can be directly connected to the output terminal of the high frequency chopping power output circuit PW, or can be connected in series with one to four fluorescent lamps. Sn is current phase shifting, current limiting, and the output end of the resonant circuit IPout is connected to the output terminal T1 of the high frequency chopping power output circuit PW. All loads of the high frequency chopping power output circuit PW, gp, current phase shift, limit The flow, the resonant circuit, the current phase shifting, the current limiting, and the fluorescent lamp D connected to the resonant unit IP are all connected in parallel with the high-frequency chopping power output circuit PW output terminal TO, Π, each current phase shifting, current limiting, resonant unit The IP is connected to a set of fluorescent lamps D, and each set of fluorescent lamps D is connected in series with the filament through a capacitor C, and the number of fluorescent lamps D connected in series is 1-4.

The current phase shifting, current limiting, resonant inductance and capacitive load fluorescent lamp D form a series resonant circuit, each of which has a different resonant frequency of each series resonant circuit, and each series resonant circuit is connected in parallel to become a resonant frequency and a whole after load The frequency of the high frequency chopping power output circuit is the same. It should be noted that the scope of protection of the present invention is not limited to the specific example manners described above. According to the basic technical idea of the present invention, embodiments that can be conceived by those skilled in the art without creative work are all of the present invention. protected range.

Claims

Request for power

A device for illuminating a plurality of fluorescent lamps, comprising: an active filter circuit, a high frequency rectification filter circuit, and a high frequency chopper power output circuit, characterized in that: a current phase shifting, current limiting, resonant circuit, a current phase shifting, current limiting, resonant circuit is connected in series with a fluorescent tube group, and a commercial power source is input to the active filter circuit; the active filter circuit outputs the high frequency rectifying and filtering circuit, the high frequency rectifying a positive voltage output end of the filter circuit is connected to a positive voltage input end of the high frequency chopper power output circuit, and a negative voltage output end of the high frequency rectification filter circuit and the high frequency chopping power output circuit The negative voltage input terminals are connected, and the high frequency chopping power output circuit supplies power to two or more current phase shifting, current limiting, and resonant circuits connected in parallel in the output circuit.

2. A device for illuminating a plurality of fluorescent lamps according to claim 1, wherein: said high frequency chopping power output circuit has an operating frequency range of 40 - 120 KC.

3. A device for illuminating a plurality of fluorescent lamps according to claim 2, wherein: said high frequency chopping power output circuit has an operating frequency of 80 kC.

4 . The device for lighting a plurality of fluorescent lamps according to claim 1 , wherein: the current phase shifting, current limiting, and resonant circuit are formed by connecting an inductor coil and a fluorescent tube group in series, and the fluorescent tube group is configured. The fluorescent tubes are connected end to end in series, and a capacitor is connected between the first end of each fluorescent lamp and one of the access ends of the tail end.

The device for illuminating a plurality of fluorescent lamps according to claim 4, wherein: the fluorescent tube group in the current phase shifting, current limiting, and resonant circuit is composed of 1 to 4 fluorescent tubes.

The device for lighting a plurality of fluorescent lamps according to claim 1 or 4, wherein: the current phase shifting, current limiting, and the inductive coil in the resonant circuit form a series resonant circuit with the capacitive load fluorescent lamp. The resonant frequency of each current phase shifting, current limiting, and resonant circuit is different. The resonant frequency of each series resonant circuit connected in parallel to form an overall load is the same as the operating frequency of the high frequency chopping power output circuit.