SU367541A1 - DEVICE FOR GALVANICAL SEPARATION OF ANALOG SIGNALS - Google Patents

Description

The invention relates to computing and measuring technology.

A device for galvanic separation of scarlet signals is known, comprising a voltage-to-voltage transducer, a pulse transformer, a trigger, a switch, and a filter.

The disadvantages of the known device are complexity, low speed, large error and low reliability.

The proposed device differs from what is known in that, in order to increase accuracy and speed, the output of the voltage converter to the duty cycle of pulses through a pulse transformer is connected to the installation inputs of a trigger, the outputs of which are connected to the inputs of the switch, and the output of the latter to a filter.

The drawing shows the block-diagram of the proposed device.

The device contains a transformer / pptani, rectifier 2; 3; 4 with filters, voltage converter 5 to pulse duty cycle, additional resistor 6, pulse transformer 7, potential trigger 8 with installation inputs and an independent source 3, switch consisting of transistor 9 ppr type and transistor 10 p. pn type resistor P in the combined circuit

base resistor 12 at the input of the filter, filter 13 (passive or active).

The device works as follows.

At zero input voltage f / i, the frequency of the signals at the output of converter 5 is maximum and the set and reset signals of trigger 8 (arrive at regular time intervals. The zero state of the trigger 8 corresponds to the open transistor 10 of the switch and the closed transistor 9, the resistor 12 is connected to the ground terminal to the source of the reference voltage. A single state of the trigger 8 corresponds to an open transistor 9 and a closed W; a resistor 12 is connected to a negative reference voltage source. Since the reference voltages are ao value and proton value by zpack, then the average value of the output nanow of a device — a Waci 0.

The combined control stub of transistors 9 and 10 of different conductivity teres- sesses the simplicity of the device circuit and reduces the through currents through the switch.

With a non-zero input voltage, the duration of the zero and one states of the trigger 8 is different and the output voltage Lnbix is different from zero.

The small error of device operation without a common feedback circuit is provided

integrating the converter 5 and the voltage ratio of the pulses, by transmitting through the impulse transformer 7 only the pulse signals of setting and resetting and switching on the transistors 9 and 10 of the switching device.

The small capacitance between the input and output windings of the pulse transformer 7 ensures stable operation of the device at high alternating voltages (about 1000 V) between the input and output. The limiting pulse frequency is limited only by converter 5 and can reach 100 kHz.

Subject invention

A device for galvanic separation of analog signals, containing a voltage converter in a pulse duty cycle, a pulse transformer, a trigger, a switch and a filter, characterized in that, in order to improve the accuracy and speed, in it the output of a voltage converter in a pulse duty cycle through a pulse transformer connected to the setup inputs of the trigger, the outputs of which are connected to the inputs of the switch, and the output of the latter with a filter.