Transformerless power supply, dual positive or dual negative...

H - Electricity – 02 – M

Patent

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Details

H02M 7/00 (2006.01) G05F 1/613 (2006.01) G05F 1/618 (2006.01) G05F 3/00 (2006.01) H02M 5/42 (2006.01) H02M 7/04 (2006.01) H02M 7/06 (2006.01) H02M 7/68 (2006.01)

Patent

CA 2358916

The positive half-cycle for an AC input signal is applied to wave rectifier (20, 22), a filter and a voltage regulator (30, 31) for generating a dc output signal. The ac input signal is also applied to a transistor (50) in either the common emitter or common source configuration which shifts the ac input signal by 180 degrees. This signal is then applied to another rectifier (21, 23) for converting the shifted ac input signal into a pulsating dc output signal. Then shifted dc output signal is applied to a second capacitor filter to reduce the signal variations. The final stage for the second output stage is also a voltage regulator (32, 33), i.e., two series zener diodes). The transformerless power supply produces either a dual positive or dual negative dc voltage supply. In addition, the voltage supply circuits may include a relay voltage, which may be controlled by a control circuit.

Selon la présente invention, on applique la demi-période positive d'un signal d'entrée c.a. à un redresseur d'onde (20, 22), un filtre et un régulateur de tension (30, 31) afin de produire un signal de sortie c.c. On applique également le signal d'entrée c.a. à un transistor (50), dans l'émetteur commun ou la configuration de source commune, qui décale le signal d'entrée c.a. de 180 degrés. On applique alors ce signal à un autre redresseur (21, 23) qui convertit le signal d'entrée c.a. décalé en un signal de sortie de courant unidirectionnel pulsé. On applique ensuite le signal de sortie décalé à un deuxième filtre de condensateur afin de réduire les variations du signal. L'étage final du deuxième étage de sortie est également constitué par un régulateur de tension (32, 33) (à savoir deux diodes Zener). L'alimentation sans transformateur de l'invention permet d'obtenir une alimentation de tension en courant continu positive ou négative double, et peut en outre comprendre une tension de relais pouvant être commandée par un circuit de commande.

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