Electron ballast passive power factor correcting circuit

Abstract

There is disclosed a passive power-factor correcting circuit for the electronic ballast, which includes BOOST circuit consisting of an inductor, a capacitor and a diode, and a current-follower circuit consisting of two electrolytic capacitors and four diodes. The BOOST circuit is series connected between the mains output circuit of the electronic ballast and the lead-in end of the filament. The current-follower circuit is parallel connected at the front end of DC / AC translation circuit of the electronic ballast.

Description

technical field [0001] The invention relates to an input power factor correction circuit of an electronic ballast, in particular to a circuit for achieving high PF correction by using a small number of passive components. Background technique [0002] The electrical pollution problem of electrical appliances in the world is becoming more and more prominent. With the increasing application of electronic ballasts, the requirements for them are getting higher and higher. In response to the national requirements for green lighting, the purification of electronic and electrical equipment and power grids Pollution rate, promote the healthy development and popularization and application of energy-saving lighting electronic and electrical products, in order to achieve the purpose of saving energy and protecting the environment. The new national standard (3C standard) has very high requirements for the power factor and harmonics of electronic ballasts. For this reason, some foreign c...

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Problems solved by technology

[0002] The electrical pollution problem of electrical appliances in the world is becoming more and more prominent. With the increasing application of electronic ballasts, the requirements for them are getting higher and higher. In response to the national requirements for green lighting, the purification of electronic and electrical equipment and power grids Pollution rate, promote the healthy development and popularization and application of energy-saving lighting electronic and electrical products, in order to achieve the purpose of saving energy and protecting the environment. The new national standard (3C standard) has very high requirements for the power factor and harmonics of electronic ballasts. For this reason, some foreign companies have developed some special PFC correction chips, such as ST's 6561, 6560, IRF's 2151, etc., which can meet the new national standard requirements in terms of power factor (PF) and harmonics, but require more Too many peripheral components make the cost price very high, and it is impossible to apply in the integrated fluorescent lamp due to too many components, which affects further promotion

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