CN2283340Y - Light-modulating electronic ballast - Google Patents

Abstract

The utility model relates to a light modulating electronic ballast. Since a polarity conversion circuit is added to the utility model, the positive and the negative polarities on both ends of a strip lamp S can be converted automatically at definite time, and the end with the positive pole of the strip lamp can not darken singly in a long service time. As showing in the specification, the utility model has a working principle that an ultra low frequency self-excitation bistable oscillation circuit is composed of an NE555 and resistors R2R3C5; the oscillation period of the oscillation circuit is in inverse proportion to the resistance of R3 and the capacity of C5; the saturation and the cutoff of a BG can be controlled by using high and low electric potential sent out from the pin of an NE5553; the automatic polarity conversion can be performed through driving a relay J to close and to release.

Description

The Light modulating type electronic ballast

The utility model belongs to electronic applications, is used for the electric ballast of all kinds of conventional fluorescent lamps pipes.

No. 94240348.7 disclosed electric ballasts of Chinese patent, owing to long-term work, fluorescent tube is because of single-ended blackening, and need touch the pillow could operate as normal.

The purpose of this utility model is, overcomes the deficiencies in the prior art part, provides a kind of cost low, and volume is little, and the fluorescent tube long service life low presses starter, and brightness can be adjusted arbitrarily, can with the Light modulating type electronic ballast of the same long-term operate as normal of inductance type ballast.

The operating circuit of Light modulating type electronic ballast described in the utility model is by diode D ₁, D ₂, D ₃, D ₄, C ₁, C ₂Form the multiplication of voltage starting circuit, D ₅, C ₄Form auxiliary starting circuit, C ₃Be AC power path, D ₅, R ₁Be fluorescent tube current-limiting, ballasting circuit, W is used for the adjustment of lighting tube brightness, it is characterized in that utilizing potentiometer W to carry out the current limliting light modulation.K is artificial polarity reversing switch, R ₀For automatic switching circuit provides power supply, C ₇Be power filter.NE555, R ₂, R ₃C ₅Form the ultra-low frequency oscillation circuit, C ₆Be high-frequency bypass capacitor, R ₄, R ₅Be current-limiting resistance, BG is the drive circuit of relay J, finishes polarity and changes automatically, also we can say, and be by R ₁, W, K, NE555, R ₂, R ₃, C ₅, BG, J constitute the light modulation polarity switching.During artificial the conversion, R ₀Short circuit.It is characterized in that NE555 3 pin output height control of Electric potentials BG saturated with end, make J closed with discharge, finish the conversion of lamp tube ends voltage positive-negative polarity self-timing.

Component parameters: D ₁, D ₂, D ₃, D ₄, D ₅Be 1N4007, C ₁, C ₂Be 2.2 μ f, C ₃Be 4 μ f, C ₄Be 0.022 μ f, R ₁Be 120 Ω, W is 15K Ω, R ₀Be 39 Ω, R ₂Be 2K Ω, R ₃, C ₅Be used to adjust cycle of oscillation, resistance, capacity are indefinite; R ₄Be 3K Ω, R ₅Be 0.39K Ω, C ₆Be 0.033 μ f, C ₇Be 1000 μ f, NEE555 is an integrated circuit, and J is JRK-13F.

Light modulating type electronic ballast described in the utility model is installed and is regardless of the zero line live wire, but 150 volts of above starters of low pressure, but the useless fluorescent tube operate as normal of filament breaking or two ends blackout, fluorescent tube prolongs useful life, and long-term continuous operation can single-ended deepening.

Accompanying drawing is the circuit diagram of Light modulating type electronic ballast described in the utility model.

Referring now to accompanying drawing, be described as follows in conjunction with the embodiments: D ₁Connect D ₂→ C ₄→ D ₅→ C ₁→ D ₃→ D ₄→ C ₃→ C ₂→ R ₀→ R ₁→ W connects fluorescent tube.R ₀Connect C ₇→ R ₅→ R ₂→ R ₃→ C ₅→ C ₆→ NE555 → R ₄→ BG → J, R ₃, C ₅Be timing resistor electric capacity cycle of oscillation of NE5555, R ₄Be isolation buffer resistance, the positive-negative polarity conversion of the contact control lamp tube ends voltage of J.

Claims (1)

1. A kind of Light modulating type electronic ballast includes diode D ₁, D ₂, D ₃, D ₄And capacitor C ₁, C ₂Constitute voltage doubling rectifing circuit, it is characterized in that R ₁, W, K, NE555, R ₂, R ₃, C ₅, BG, J constitute the light modulation polarity switching.

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