FREQUENCY-CURRENT TRANSFORMER (VARIANTS) Russian patent published in 2008 - IPC H03K9/06 H03K7/08 

FIELD: electric measuring equipment and automatics.

SUBSTANCE: technical effect is achieved by separation of circuit of generation of impulses, with dosed charge, from the circuit of positive check connection of current-controlled current supply which generates currents of the device. Frequency-current transformer contains generator of clock impulses (1), which generates short impulses from fronts of impulses of frequency being transformed, low frequency filter (8,9), launching current supply (10), which ensures nonzero starting value of current at the output of low frequency filter and which is disabled when device launches, mono-stable multi-vibrator, which consists of integrating capacitor (4), switch (5) for discharging integrating capacitor (4), switch (6) for bridging the input of low frequency filter, device for comparing voltage (2) on integrating capacitor (4) and supporting voltage Uo, memorizing device (3), which closes switches (5,6) when voltages are equal in comparison device (2) and opens switches (5,6) when return to initial state is caused by impulses of clock impulse generator (1). Introduced to the transformer is a current-controlled current supply (7), which ensures output current in external load (11) and deflects the control current of current-receiving input (i), which is connected to the output of low frequency filter, to separate outputs, one of which provides current of discharge of integrating capacitor (4) connected to it, and second one, which is connected to the input of low frequency filter and has current transfer coefficient equal to or greater than one, constitutes the check connection contour, which generates current for controlling the current-controlled current supply.

EFFECT: simplification of devices, reduced lower limit of power voltage for circuits.

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