Constant current driving power supply without polarity distinguishing and LED (Light Emitting Diode) fluorescent lamp

Abstract

The invention discloses a constant current driving power supply without polarity distinguishing, which comprises an input current polarity determination unit, a double-bridge switch and a constant current controller, wherein the input current polarity determination unit is used for determining the polarity of input power; the double-bridge switch is connected with the input current polarity determination unit to rectify current provided by the input current polarity determination unit and then perform polarity switching on obtained direct current to keep the polarity of output current in a constant state; and the constant current controller is connected with the double-bridge switch for sampling a current value and a voltage value of the output current of the double-bridge switch from time to time to control the output current to be output in a constant state. The constant current driving power supply without polarity distinguishing is connected to a power supply without distinguishing the polarity of the power supply and is also suitable for a user who has no circuit knowledge.

Description

technical field [0001] The invention relates to the technical field of lighting, in particular to a non-polarity-differentiated constant-current drive power supply and an LED fluorescent lamp. Background technique [0002] The overall circuit of the traditional fluorescent lamp is as follows: figure 1 shown. Its working principle is: when the switch is turned on, the power supply voltage is immediately added to the two poles of the starter through the ballast and the lamp filament. The voltage of 220 volts immediately ionizes the inert gas of the starter, producing a glow discharge. The heat of the glow discharge causes the bimetal to expand and the two poles come into contact. The current passes through the ballast, the contact of the starter and the filament at both ends to form a path. The filament is quickly heated by the current, emitting a large number of electrons. At this time, since the two poles of the starter are closed, the voltage between the two poles is z...

AI Technical Summary

Problems solved by technology

[0008] When the power supply of traditional fluorescent lamps is connected, the wiring can only be carried out according to the prescribed method. Since there are lamp caps at both ends of the fluorescent lamps, and there are two conductive columns on each lamp cap, once the power supply is wrongly connected (for example, the two ends of the power supply connected to the same lamp head, or the starter and the ballast are cross-wired), which will cause failure to start or damage the fluorescent lamp

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