Multi-frequency oscillator applied to electronic ballast

Abstract

The invention discloses a multi-frequency oscillator applied to an electronic ballast, which mainly solves a problem that the service life of a fluorescent lamp is short due to the absence of preheating and ignition. The multi-frequency oscillator of the invention comprises a reference current generating circuit, a voltage control circuit, a current control circuit, a current mirror circuit and anoscillating signal generating circuit, wherein the current control circuit is connected between the reference current generating circuit and the current mirror circuit and used for generating charge / discharge current in a functional relationship with reference current and voltage control output voltage so as to enable the oscillator to work in different frequencies, the voltage control circuit isconnected to the output of the current control circuit, and the current control circuit is controlled by the output of the voltage control circuit, thereby realizing adjustment of different frequencytimes of the oscillator, and completing preheating, ignition and normal light emission of the fluorescent lamp. The multi-frequency oscillator can prolong the service life of the fluorescent lamp andcan be widely applied to the electronic ballast of the fluorescent lamp.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits and relates to an analog integrated circuit, in particular to a frequency oscillator which can be used in electronic ballasts for fluorescent lamps. Background technique [0002] Multi-frequency oscillators are widely used in fluorescent lamp electronic ballasts, which can complete the preheating, starting and normal lighting of fluorescent lamps by changing their frequency in different time periods. According to the characteristics of the preheating fluorescent lamp, its normal operation requires three working stages: 1. Give the filament a high current to preheat within a certain period of time; 2. Give the lamp a sufficiently high starting voltage for ignition within a short period of time. ; 3. Finally, make the lamp work normally and emit light under the rated power. When the lamp circuit is at the preheating frequency f ph Preheating; when the frequency gradually decreases and ...

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Problems solved by technology

[0004] It can be seen that, because the above-mentioned existing oscillator charge and discharge current is constant, the frequency of the oscillator is fixed, and the preheating and ignition of the fluorescent lamp cannot be completed, resulting in shortened life of the fluorescent lamp.

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