CN2438293Y - Ballast of fluorescent lamp - Google Patents

Abstract

The utility model relates to a straight pipe type ballast of a fluorescent lamp, which is composed of a bridge rectifier circuit, a boosted circuit, a timing circuit, a voltage-doubler circuit and a relay which are connected with each other, wherein the bridge rectifier circuit passes through the boosted circuit, outputs the high voltage pulse, and starts a lamp tube under the cold state. If the lamp tube fails to be started immediately, the voltage-doubler circuit intermittently outputs the diploid instantaneous high voltage pulse to act on the lamp tube until the lamp tube is started. The timing circuit outputs a drive signal to control the timing conversion of the reversing switch of the relay. The polarity of the voltage of both ends of the lamp tube is altered to prolong the lamp tube lifetime and improve the luminous efficiency. The utility model has the advantages of energy conservation, low consumption, durability, no stroboflash, no noise, etc.

Description

A kind of fluorescent lamp ballast

The utility model belongs to electricity field, specifically a kind of straight pipe type fluorescent lamp Energy-saving ballast.

Straight pipe type fluorescent lamp generally adopts Inductive ballast at present, and its major defect is that power factor is low, and power consumption is heavy, and the starter of being furnished with is a consumable accessory, and reliability is reduced; In recent years, energy-saving electronic ballast is because of power saving and do not need starter to have the trend that replaces Inductive ballast, and this electric ballast is subjected to the restriction of electronic component absolute rating, its reliability is well below Inductive ballast, though its energy power saving, but do not reach economical purpose owing to failure rate is high, be difficult to generally promote yet.

The straight pipe type fluorescent lamp Energy-saving ballast that provides a kind of reliability high is provided the purpose of this utility model.

For reaching above-mentioned purpose, the utility model is provided with relay, it is characterized in that: utilize two groups of transfer contacts of relay to be connected into reversing switch, the coil of relay connects the output of timing circuit, timing circuit and bridge rectifier all connect AC power, and two outputs of bridge rectifier connect booster circuit, reversing switch, series connection voltage-multiplying circuit and inductor successively and follow the two ends of fluorescent tube to be connected.After the energized, bridge rectifier is added to lamp tube ends through the pulse of booster circuit output HIGH voltage, under cold conditions, directly start fluorescent tube, if when fluorescent tube fails to be activated immediately, voltage-multiplying circuit will intermittently be exported two times instantaneous high pressure impulse action in fluorescent tube, till fluorescent tube is activated.After fluorescent tube is activated, reduce to rated value, keep operate as normal because of internal resistance reduces to make voltage; Timing circuit output drive signal control relay reversing switch is regularly changed, and changes the polarity that is added in lamp tube ends voltage, with prolonging lamp tube service life and raising luminous efficiency.

The utility model electronic component is selected high back-pressure diode and high voltage-resistant capacitor for use, and the electrical quantity surplus is very big, guarantees the work high reliability.Owing to adopt the cold start fluorescent tube, allow filament two exits and place in circuit together, the protection filament; can prevent the lamp tube ends blackout; thereby in the life-span of prolonging lamp tube, the useless fluorescent tube of fracture of wire still can use, and has remarkable advantages such as energy-conservation, low consumption, durable, no stroboscopic, noiselessness.

The utility model is specifically described by embodiment below in conjunction with accompanying drawing.

Fig. 1 is the calcspar of present embodiment.

Fig. 2 is the electrical schematic diagram of present embodiment.

Mark among the figure: diode D ₁～D ₆, voltage stabilizing didoe DW, triode BG ₁, BG ₂, resistance R ₁～R ₈, capacitor C ₁～C ₉, digital integrated circuit IC ₁CD4060, photoelectrical coupler IC ₂, relay J ₁, J ₂, inductor L.

Shown in Figure 1, utilize two groups of transfer contact interconnections of relay to become reversing switch, relay coil connects the output of timing circuit, timing circuit and bridge rectifier all connect AC power, two outputs of bridge rectifier connect booster circuit, reversing switch, series connection voltage-multiplying circuit and inductor successively, with the two ends connection of fluorescent tube.

Shown in Figure 2, diode D ₁～D ₄Be connected into bridge rectifier, its input seals in capacitor C ₁Connect AC power, capacitor C ₂, C ₃Following termination AC power, the upper end connects the output of bridge rectifier respectively, succeeds appliance contact J again _1-1And J _1-2Cutter, J _1-1, J _1-2Normally opened contact and normally-closed contact interconnection, series diode D respectively again ₆With inductor L, connect the two ends of fluorescent tube, relay J ₂Normally-closed contact and diode D ₆Parallel connection, normally opened contact and normally-closed contact connect capacitor C ₄, normally opened contact also passes through resistance R ₁Connect the negative output terminal of bridge rectifier; Voltage stabilizing didoe DW and C ₉The series connection AC power, the negative pole of voltage-stabiliser tube DW and rectifier diode D ₅Positive pole join D ₅Negative pole and the anodal shunt capacitance C of DW ₅, IC ₁Vdd terminal pass through resistance R ₂Meet diode D ₅Negative pole, its V _SsThe positive pole of termination DW, IC ₁Reset terminal connecting resistance R ₃And capacitor C ₇, R ₃The positive pole of another termination DW, C ₆Another termination V _DDEnd, resistance R ₄, R ₅And C ₇With IC ₁Internal circuit constitutes oscillator, and output signal end is through R behind frequency division ₇With BG ₁Base stage connect, emitter connects the positive pole of DW, collector connecting relay J ₁Coil, another termination of coil D ₅Negative pole, the low level frequency division output terminal is passed through R ₆With photoelectrical coupler IC ₂Output termination BG ₂Base stage, its collector connecting relay J ₂Coil, another termination of coil D ₅Negative pole.IC ₂Positive input terminal through resistance R ₈Connect the positive output end of bridge rectifier, IC ₂Negative input end connect the negative output terminal of bridge rectifier, IC ₂Input shunt capacitance C also ₈

After the utility model is connected AC power, the output of bridge rectifier is behind booster circuit, the pulse of output dc high voltage, add to the two ends of fluorescent tube by relay contact, change over switch, voltage-multiplying circuit and inductor, this high voltage can directly start fluorescent tube under cold conditions, if fluorescent tube fails to be activated, the output high pressure is through resistance R ₈Step-down can be lighted photoelectrical coupler IC ₂The light-emitting diode of input makes the output conducting, and the low level fractional frequency signal of timer is added to BG ₂Base stage, make BG ₂Intermittently conducting and end control relay J ₂Action, C at this moment ₄Through R ₁Be filled with negative just down voltage, J ₂During adhesive, its normally opened contact is connected, with C ₄On charging voltage be connected on main circuit, the instantaneous high pressure that be added in lamp tube ends this moment is original two times, after fluorescent tube was activated, output voltage descended, IC ₂Output be high-impedance state, cut off J ₂Control signal, voltage-multiplying circuit is quit work.Fluorescent tube is activated the back internal resistance and reduces thereupon, and lamp tube ends voltage will drop to rated value, keep the fluorescent tube operate as normal.

AC power is through capacitor C ₉After the step-down, by voltage stabilizing didoe DW and diode D ₅Rectification, C ₅Filtering obtains dc low-voltage for timing circuit, and timing circuit is by IC ₁Internal circuit and R ₄, R ₅, C ₇Form oscillator, behind multistage frequency division, export timing signal, through resistance R ₇Deliver to BG ₁Base stage, make BG ₁Regularly conducting with end, the control relay change over switch changes the polarity of the voltage that is added in lamp tube ends, and two cathode wheel of fluorescent tube are changed jobs, prolonging lamp tube service life improves luminous efficiency.

Claims (1)

1, a kind of fluorescent lamp ballast, be provided with relay, it is characterized in that utilizing two groups of transfer contacts of relay to be connected into reversing switch, the coil of relay connects the output of timing circuit, timing circuit and bridge rectifier all connect AC power, two outputs of bridge rectifier connect booster circuit successively, reversing switch, the series connection voltage-multiplying circuit is connected with the two ends of inductor with fluorescent tube, after the energized, bridge rectifier is through the pulse of booster circuit output HIGH voltage, be added to lamp tube ends, directly start fluorescent tube under cold conditions, when failing to be activated immediately as if fluorescent tube, voltage-multiplying circuit will intermittently be exported two times instantaneous high pressure impulse action in fluorescent tube, till fluorescent tube is activated, after fluorescent tube is activated, reduce to rated value, keep operate as normal because of internal resistance reduces to make voltage; Timing circuit output drive signal control relay reversing switch is regularly changed, and changes the polarity that is added in lamp tube ends voltage, with prolonging lamp tube service life and raising luminous efficiency.

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