Power-adjustable rectifying circuit

Abstract

The embodiment of the invention discloses a power-adjustable rectifying circuit, comprising a rectifying circuit and a triggering circuit; the rectifying circuit comprises two thyristors and two diodes, which form a first rectifying bridge circuit connected to a mains supply; the triggering circuit comprises a relaxation oscillation circuit formed by unijunction transistors; the relaxation oscillation circuit is provided with an RC oscillation circuit and an adjustable resistor capable of adjusting oscillation frequency; and the triggering circuit also comprises a synchronous transformer, a second rectifying bridge circuit connected with the synchronous transformer and a voltage-regulator tube for performing clipping on the second rectifying bridge circuit to power the relaxation oscillation circuit. After the power-adjustable rectifying circuit is adopted, switch control signals of the thyristors are provided for the rectifying circuits by the synchronous triggering circuit, thus enabling the power size of the output circuit of the rectifying circuit to be adjustable. The power-adjustable rectifying circuit can be used as a control unit for power controlling, can be used for the non-polar speed adjusting of a motor and the power control unit for electromagnetic heating, and is simple in structure and stable in performance.

Description

technical field [0001] The invention relates to the field of analysis and manufacture of electronic circuits, in particular to a rectifier circuit for adjusting power through pulse phase shifting. Background technique [0002] The process of converting alternating current into direct current is called rectification. In daily life and industrial production, many electrical equipment need adjustable direct current power. However, the current direct current power in the prior art is generally fixed power, or its power is small and adjustable. The adjusted output power range is small, the switching loss of the circuit is large, various components are used, the wiring is complicated, the performance is unstable, and the maintenance cost is high. [0003] The single-phase semi-controlled rectifier circuit composed of thyristors can convert alternating current into direct current with controllable size, so as to achieve the purpose of adjustable direct current voltage. Moreover, t...

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Problems solved by technology

[0002] The process of converting alternating current into direct current is called rectification. In daily life and industrial production, many electrical equipment need adjustable direct current power. However, the current direct current power in the prior art is generally fixed power, or its power is small and adjustable. The adjusted output power range is small, the switching loss of the circuit is large, a variety of components are used, the wiring is complicated, the performance is unstable, and the maintenance cost is high.

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