DEVICE OF ANALOG SENSOR OF PHASE SHIFT ANGLE BETWEEN VOLTAGE AND CURRENT Russian patent published in 2013 - IPC H02P7/00 H02P7/14 H02P7/282 

FIELD: measuring equipment.

SUBSTANCE: invention can be used as a sensor of phase shift angle between voltage and current in control systems of synchronous motors actuation, when they are operating in the mode of power factor stabilisation in the load node as well as in control systems of reactive power compensation of induction heating units operating on industrial and medium frequencies when heated to high temperatures, a device for measuring the phase shift angle ±80° can be connected to the device output. The device comprises input voltage terminals connected to the inputs of two comparators which outputs are connected to inputs of dynamic D-trigger, the terminal of alternating signal proportional to the current is connected to the input of the preamplifier, the output of this amplifier is simultaneously connected to the input of the comparator and the precision rectifier, the output of the EXCLUSIVE OR is connected to the input of an operational amplifier (OA) in differential connection with the control transistor to change the polarity of the output voltage, the transistor switching torques are made using positive NAND gates, the time delays and synchronised D - trigger.

EFFECT: measuring not only the phase shift angle, but the change of sign of the output voltage at the advance of the current compared to lagging, fast response time for use of the sensor in closed systems with a common point of bipolar voltage, absence of signal at the output.

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