Capacitive switch safety isolation program-controlled power supply circuit

Abstract

The invention discloses a capacitive switch safe isolation program-controlled power supply circuit. The capacitive switch safe isolation program-controlled power supply circuit comprises a bridge type rectifying circuit, a single chip microcomputer, a capacitive program-controlled voltage-reduction circuit and a switch circuit; the bridge type rectifying circuit is composed of triodes Q1 and Q3 and diodes D2 and D3; the base electrodes of the triodes are connected with the single chip microcomputer; the capacitive program-controlled voltage-reduction circuit comprises capacitors C2, C3 and C4 and triodes Q4 and Q5 to form direct current stage-by-stage voltage reduction; the base electrodes of the triodes Q4 and Q5 are connected with the single chip microcomputer; the switch circuit comprises two groups of program-controlled synchronous switches; the first group switches are connected with the output end of the bridge type rectifying circuit, and the input ends of the capacitor C2 and the triode Q4; the second group of switches are connected with the output ends of the capacitor C2 and the triode Q4, and the input ends of the capacitor C3 and the triode Q5; and the two groups of the program-controlled synchronous switches are closed in different time. The capacitive switch safe isolation program-controlled power supply circuit adopts the capacitive program-controlled voltage-reduction circuit instead of a cumbersome power supply transformer, so that the factor power of the mains supply is improved and a large amount of electric energy is saved.

Description

technical field [0001] The invention relates to the technical field of power circuits, and more specifically relates to a capacitive switch safety isolation program-controlled power circuit. Background technique [0002] The traditional power supply circuit is inseparable from the safety isolation transformer, which can prevent the electric shock risk of the subsequent stage circuit while stepping down the voltage. Transformers are inductive components. All walks of life in the society use a large number of inductive reactance electrical appliances, such as: motors, injection molding machines, incubators, electric water heaters, electric heaters, induction cookers, electric kettles and so on. Extensive use of inductive reactance electrical appliances will cause huge waste of energy for the country's mains power supply, because inductive circuits will increase the reactive power of the mains and reduce the power factor. If a capacitive circuit is used to compensate (neutral...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a capacitive switch safety isolation program-controlled power supply circuit in view of the problem of reducing the power factor of the current safety isolation transformer, which cancels the safety isolation transformer and adopts a capacitor for voltage reduction. Security isolation to overcome deficiencies of existing technologies

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