Amplitude-controlled trapezoidal wave generating circuit

Details Amplitude-controlled trapezoidal wave generating circuit Amplitude-controlled trapezoidal wave generating circuit

1990-05-08

1991-01-29

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331143, H03K 400

Patent

active

049889583

ABSTRACT:
An AC power source apparatus to be used in an AC corona generator necessary for a de-electrification/separation process, which is one of electrographic image forming processes, or in a case where a low frequency AC power source is required, has a construction such that a high-frequency pulse, whose time ratio is modulated trapezoidally with time, is applied to switching elements connected in inverse-series across a primary winding of a transformer, an inductance element having a regenerative diode and a reset winding is inserted between an intermediate tap of the primary winding of the transformer and a DC power supply input terminal, and an LC filter is formed by stray capacitance of a secondary winding of the transformer, whereby a desired output waveform can be produced with a simple circuit construction.
A trapezoidal wave used in the AC power source apparatus is generated by an amplitude-controlled trapezoidal wave generator which includes a wave-forming capacitor which is charged and discharged by two variable current sources under control of a timing circuit.

REFERENCES:
patent: 4176392 (1979-11-01), Cronin et al.
patent: 4465983 (1984-08-01), Hogeboom
patent: 4652837 (1987-03-01), D'Arrigo et al.
patent: 4714978 (1987-12-01), Coleman
patent: 4742315 (1988-05-01), Schreilechner

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