CN2261710Y - Running circuits for neon and fluorescent lights - Google Patents

Abstract

The utility model relates to a running circuit for neon lamps and fluorescent lights. The utility model is characterized in that lamp tubes and a capacitor are connected in series and connected with a main circuit in parallel; the capacitor is used for limiting current and reducing voltage to cause the utility model to work normally. The utility model has the advantages of no influence of bad lamps to the work of good lamps, low working voltage, reliable work, low cost, energy saving and adjustable brightness.

Description

Neon light fluorescent lamp operating circuit

The utility model relates under the situation that a kind of neon light fluorescent lamp operating circuit, particularly fluorescent tube keep-alive voltage be much higher than operating voltage practical especially.

Existing neon light calligraphy and painting, advertisement or the like; All form by some groups of neon light tubes; Each group is made of an electronic transformer and some neon light tubes.220 volts of alternating currents enter electronic transformer and become 300 volts of left and right sides direct currents through rectifying and wave-filtering, become 1.5 ten thousand volts of high-tension electricities by the electronic transformer oscillation boosting; Some neon light tube power supplies to series connection.Because its electronic transformer uses the high back-pressure high power valve rate of doing work to amplify, its input power has suitable part consumption on high power valve, causes power utilization low, uses high-power high inverse-voltage tube to make neon light cost height.Because it is series at circuit by some fluorescent tubes, damage if any one fluorescent tube; To cause other fluorescent tube of series connection to extinguish; Simultaneously owing to the supply power voltage height is easy to puncture over the ground burn, as find untimelyly will cause fire.Existing fluorescent lamp uses the so-called electric ballast of Inductive ballast or capacitance voltage-multiplying rectification, because fluorescent lamp works in dc state and fluorescent tube easily takes place wears out and be difficult to popularization in Inductive ballast self power consumption and price height and the electric ballast.

The purpose of this utility model be to provide one and in tube circuit serial connection current limliting decompression capacitor; Make the circuit (supply voltage must greater than the fluorescent tube keep-alive voltage) of its fluorescent tube operate as normal and constitute simple in structure, with low cost, and very reliable neon light, fluorescent lamp operating circuit.

The purpose of this utility model is achieved like this, and earlier with transformer line voltage is raised to the keep-alive voltage that is higher than fluorescent tube (be higher than the keep-alive voltage of fluorescent tube as line voltage, can without step-up transformer).Again the fluorescent tube series capacitance; Again each fluorescent tube of having connected electric capacity is parallel on the two poles after boosting, voltage after owing to boost is higher than the keep-alive voltage of fluorescent tube, before lighting, because tube impedance is far longer than condensance, voltage almost is added on fluorescent tube the two poles of the earth entirely, fluorescent tube is promptly lighted, and light the back tube impedance and be far smaller than condensance, thereby the result makes the voltage major part be added in the function that the current limliting step-down has been realized at electric capacity the two poles of the earth; Make the circuit operate as normal.

The utility model is parallel to main circuit and the step-down of employing capacitance current-limiting because fluorescent tube uses; So compare following advantage with existing neon light fluorescent lamp operating circuit: 1. the fluorescent tube of Sun Huaiing can not influence the normal use of intact fluorescent tube; 2. because main circuit voltage need only be higher than the neon light tube keep-alive voltage, so working voltage is low; Be difficult to take place puncture over the ground and cause fire; 3. how many roots the utility model fluorescent tube of at will working has all use a transformer that cost is reduced greatly; 4. as using common electrical sense transformer spoilage extremely low; Heating and consuming energy during the ballast work of 5. existing fluorescent lamp, the utility model uses the capacitance current-limiting step-down and electric capacity self does not consume energy, so the power factor height; 6. change capacitance or transformer number of turn tunable optical.

Accompanying drawing 12 is circuit working schematic diagrams of the present utility model.

Now described in detail according to accompanying drawing.

As shown in the figure: 1. civil power V1 boosts to V2 (as the keep-alive voltage of line voltage greater than fluorescent tube through transformer, shouldn't transformer directly meet V1), and V2 voltage is greater than fluorescent tube keep-alive voltage 3., before lighting, because fluorescent tube 3. impedance is far longer than 2. impedance of electric capacity, voltage almost is added in 3. the two poles of the earth of fluorescent tube entirely, and fluorescent tube will be lighted, light the back since fluorescent tube 3. impedance be far smaller than 2. impedance of electric capacity.According to series connection dividing potential drop theorem, voltage is added in electric capacity with major part and 2. goes up, and has so just realized the purpose of current limliting step-down, thereby makes the circuit operate as normal.

Claims (1)

1, a kind of neon light fluorescent lamp operating circuit is characterized in that voltage at main circuit is higher than under the prerequisite of keep-alive voltage of fluorescent tube, fluorescent tube and capacitances in series, is parallel to main circuit then and makes its operate as normal.

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