CN2277159Y

CN2277159Y - Electronic ballast

Info

Publication number: CN2277159Y
Application number: CN 94217432
Authority: CN
Inventors: 李忠友
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-07-21
Filing date: 1994-07-21
Publication date: 1998-03-25
Anticipated expiration: 2004-07-21

Abstract

The utility model relates to an electronic ballast for fluorescent lamps. The electronic ballast can independently start normal or filament-broken but not airtight fluorescent lamps, and can relatively prolong the service life of the fluorescent lamps. The electronic ballast is mainly characterized in that the input end of an AC power supply is provided with a voltage doubling rectifying circuit which is composed of diodes, capacitors and resistors and is capable of raising commercial power into DC 500V; a resistance-capacitance oscillator which is composed of triodes, resistors, capacitors, etc. is arranged behind the voltage doubling rectifying circuit. After a fluorescent lamp is started by the DC 500V voltage, the resistance-capacitance oscillator starts working and generates sinusoidal AC voltage; the sinusoidal AC voltage is sent to the output end of the power supply to maintain the continuous work of the fluorescent lamp after mutually superimposed with the DC 500V voltage.

Description

Electric ballast

The utility model relates to a kind of fluorescent start device.

Traditional fluorescent lamp ballast belongs to Inductive ballast, and this ballast need cooperate starter to use, and fluorescent lamp was difficult for starting when lower or room temperature was low when supply voltage.At present, occurred several electric ballasts on the market, mostly they are to be made of rectification circuit and booster circuit, can be used for starting fluorescent lamp separately, but heater current is bigger when starting, and influences fluorescent lifetime.Above-named ballast all can't start the disconnected but fluorescent lamp of end gas leakage still of filament.

The purpose of this utility model is that a kind of electric ballast will be provided, it does not need starter cooperate can be at supply voltage lower or room temperature than starting normal daylight lamp and the gastight waste and old fluorescent lamp of fracture of wire under the situation at the end, and starting current is little, the flicker free phenomenon.

The purpose of this utility model is to realize like this; In insulation crust, ac power input end connects a voltage doubling rectifing circuit of being made up of rectifier diode D1, D2, capacitor C 1, C2 and resistance R 1, and this circuit is under the input AC electro ultrafiltration, D1 and D2 take turns conducting in the circuit, when the D1 conducting, D2 ends, the C1 charging; When the D2 conducting, D1 ends, C1 discharge and and the input electricity receive and press together to the C2 charging, when C2 is charged to maximum,, and produce the direct voltage of 500V at the R1 two ends to the R1 discharge, connect one after the voltage doubling rectifing circuit by triode T ₁The RC oscillator that resistance R 2R3R4R5R6, capacitor C 3C4C5 form, the 500V direct voltage that voltage doubling rectifing circuit produces, RC oscillator behind the fluorescent start is started working, produce sinusoidal voltage, this voltage is delivered to power output end behind the superposition mutually with the 500V direct voltage that voltage doubling rectifing circuit produces, and uses for load.During work, at first the 5000V direct voltage that is produced by voltage doubling rectifing circuit is worked fluorescent start by sending making alive to keep fluorescent lamp more continuously.

The utility model is owing to adopt the voltage doubling rectifing circuit circuit structure that combines with the RC oscillator, so it can not only the independent startup fluorescent lamp, and the gastight waste and old fluorescent lamp of fracture of wire utilized once more.In addition, this product also has and adapts to that voltage ripple of power network is big, variation of ambient temperature is big, starting current is little, suppresses characteristics such as fluorescent lamp flicker, effectively light modulation useful life extended day.

Below in conjunction with accompanying drawing the utility model is further specified.

Fig. 1 be electrical schematic diagram of the present utility model,

A, B are power input among the figure, and C, D are power output end.

When implementing, the utility model can take following measure: in insulation crust, (omit in the accompanying drawing), alternating current input AB connects a voltage doubling rectifing circuit (1) of being made up of rectifier diode D1D2, capacitor C 1C2 and resistance R 1, when interchange input VAB is positive half cycle, diode D1 conducting, D2 ends, and capacitor C 1 is recharged; When VAB is negative half period, diode D1 ends, the D2 conducting, the voltage addition at VAB and C1 two ends, charge to C2 through D2, when C2 is charged to maximum, discharge to R1, and producing the direct voltage of 500V at the R1 two ends, this voltage is at first with fluorescent start, makes then to be connected voltage doubling rectifing circuit (1) afterwards, the RC oscillator of forming by triode T1, electric cloudy R2R3R4R5R6, capacitor C 3C4C5 (2), produce self-oscillation, produce sinusoidal voltage, this voltage and 500V direct voltage are delivered to output behind the superposition mutually and are used for load.During work, at first the 500V direct voltage that is produced by voltage doubling rectifing circuit (1) is kept fluorescent start fluorescent lamp by superposition voltage again and is worked continuously.When using the utility model to start fluorescent lamp, the terminals at fluorescent lamp two ends can be inserted power output end CD arbitrarily, also two terminals short of same end can be used.

Claims

1, a kind of electric ballast, it is made up of voltage doubling rectifing circuit (1) and RC oscillator (2), it is characterized in that: connect the voltage doubling rectifing circuit of forming by rectifier diode D1D2, capacitor C 1C2 and resistance R 1 (1) that civil power can be upgraded to direct current 500V at ac power input end, connect one thereafter by triode T ₁, the RC oscillator (2) formed of resistance R 2R3R4R5R6 and capacitor C 3C4C5, the direct current 500V voltage that voltage doubling rectifing circuit (1) produces with fluorescent start after, RC oscillator (2) is started working, and sinusoidal voltage and the acting in conjunction of direct current 500V voltage that it produces are kept the fluorescent lamp operate as normal in power source loads.