CN2276700Y - High-voltage sodium lamp electronic ballast - Google Patents

Abstract

The utility model relates to a high voltage sodium lamp electronic ballast, a switching power circuit in an independent excitation half-bridge series resonant type is adopted. Self-loop is adopted by starting high voltage pulse source which can be offered through voltage increase of a transformer B1. A relay J1 controls the start, the lighting up and the high voltage removal after the lighting up. The control of output power can be realized by a relay J2. The utility model has the advantages of reliable operation, small size, light weight, high power factor, and power saving, and the utility model can prolong the service life of a sodium lamp.

Description

Electronic ballast of high voltage sodium lamp

The utility model especially is widely used in high-pressure sodium lamp about the electric ballast of high intensity discharge formula lamp.

At present in illumination work,, but depend on the work that the electromagnetic type ballast of low frequency, poor efficiency is stablized lamp for a long time as the high-pressure sodium lamp of more advanced electric light source always.The utility model provides a kind of energy-efficient electric ballast.

The utility model produces integrated circuit (IC) by pulse ₁, field effect transistor T ₁, T ₂And inductance L ₁, capacitor C ₁, C ₂, C ₃Form separate excitation half bridge series resonance formula switching power circuit.Set in the loop " igniting " high-tension transformer B ₁For fluorescent tube provides the starter high pressure.At three terminal regulator IC ₂Outlet side and input side be respectively equipped with relay J ₁And J ₂, its normally opened contact J _1-2With transformer B ₁Elementary winding be in parallel.Normally opened contact J _1-1After closure, make lamp and capacitor C ₄Be in parallel normally opened contact J _2-1After closure, make capacitor C ₆And receive capacitor C ₃On.Form high pressure " igniting " and power adjustments automatic control circuit thus.

Further specify operation principle of the present utility model below in conjunction with accompanying drawing.

Accompanying drawing is the electrical schematic diagram of the utility model embodiment.Referring to accompanying drawing, rectifier bridge BR ₁1,2 termination 220V alternating voltages.Through BR ₁Rectification, C ₁₀Be by field effect transistor T after the filtering ₁, T ₂The half bridge series resonance formula Switching Power Supply of forming provides the direct-current working volts of nearly 300V.Transformer B ₃With the 220V ac buck, through rectifier bridge BR ₂And capacitor C ₁₁Rectifying and wave-filtering is again through integrated three-terminal regulator IC ₂It after the voltage stabilizing integrated circuit (IC) ₁And transistor T ₃～T ₆Deng the low-voltage direct working power is provided.

Integrated circuit (IC) ₁Two-way output 9 pin and 10 pin, alternately export positive pulse.Deliver to by transistor T respectively ₃～T ₆And resistance R ₇, R ₈And transformer B ₂Two inputs of the bridge drive circuit of forming are transistor T ₃, T ₄Base stage and T ₅, T ₆Base stage.Transformer B ₂Two output windings of the inferior utmost point are through resistance R ₁And R ₂Receive field effect transistor T respectively ₁And T ₂The control grid.

By controllable silicon SCR and resistance R ₃, capacitor C ₇And relay J ₁Form the high-pressure sodium lamp starter, light and light back high pressure dismounting automatic control circuit.220V exchanges powered on moment, because capacitor C ₇On voltage be zero, not conducting of controllable silicon SCR.Relay J ₁So not adhesive is contact J _1-1, J _1-2Still keep normally open.Because C ₄＜＜C ₃, produce the high-frequency current of nearly 80KHZ this moment in the loop, and this electric current flows through transformer B ₁Primary coil, after secondary boosting the high frequency voltage of nearly 4000V.Because internal resistance is high before the lamp starter, so approximate open circuit is transformer B ₁High pressure on the secondary coil is through capacitor C ₃And C ₅All be added to the two ends of lamp, made the lamp starter.After this, three terminal regulator IC ₂Output voltage through resistance R ₃To capacitor C ₇Charge, voltage that is controllable silicon SCR control pole tension will rise gradually on it.After 1～2 second, SCR conducting, relay J ₁Adhesive, its contact J _1-1, J _1-2Transfer closure to by often opening.Contact J _1-1After the closure, make lamp and capacitor C ₄Be in parallel, lamp is access in major loop and lights.The bright back impedance of lamp becomes very little, capacitor C ₄By the lamp bypass.The loop resonance frequency drops to set point.Contact J _1-2After the closure with transformer B ₁The primary winding coil short circuit, high pressure is removed thus.

Transistor T ₇, voltage stabilizing didoe D, relay J ₂And resistance R ₉, R ₁₀Form the power auto-adjusting circuit.When line voltage surpasses the 220V certain numerical value, such as 240V, transformer B ₃Secondary through rectifier bridge BR ₂Corresponding being elevated to of the voltage that rectification is come out makes voltage stabilizing didoe D puncture transistor T ₇Saturation conduction, relay J ₂Adhesive.This moment contact J _2-1Transfer closure to by often opening, make capacitor C ₆And C ₃Be in parallel.The result makes the power output that has raise because of the line voltage rising fall back to set point again, to prolong the useful life of lamp.

Claims (1)

1, a kind of separate excitation half bridge series resonance formula electronic ballast of high voltage sodium lamp.It is characterized in that: in resonant tank, be provided with inductance L successively ₁, " igniting " high-tension transformer B ₁, capacitor C ₃, C ₄And C ₅Simultaneously, at three terminal regulator IC ₂Outlet side and input side be respectively equipped with relay J ₁And J ₂, its normally opened contact J _1-2With transformer B ₁Elementary winding is in parallel, normally opened contact J _1-1Make lamp and capacitor C after the closure ₄Be in parallel normally opened contact J _2-1Make capacitor C after the closure ₆And C ₃Be in parallel, form high-voltage pulse " igniting " and power adjustments automatic control circuit.

Images