ALTERNATING VOLTAGE STABILISER Russian patent published in 2009 - IPC G05F1/20 

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering, and more specifically to ac voltage stabilisers, meant for use in electrical power supply systems. The alternating voltage stabiliser contains an autotransformer, commutator, automatic switch, power supply device for the control device, terminals for connection to mains and a load, load current sensor, device for displaying information on the state of the stabiliser, device for connecting the load, a device for controlling the stabiliser, containing a microcontroller, output voltage sensor, load current sensor and a clock pulse sensor, as well as protective earthing terminals. To determine input voltage and control of operation of the alternating voltage stabiliser, readings of the output voltage sensor are used in the absence of the input voltage sensor. To determine input voltage and control the stabiliser in on mode the relationship between impedances is used, when the impedance between input and output voltage contacts is many times less than impedance between the commutator and the common contact. The input voltage is within a small percentage equal to output voltage, measured by the output voltage sensor. To determine input voltage and control the stabiliser in on mode of the microcontroller, readings of the output voltage sensor are used to determine whether input voltage readings are within the permissible range and an instruction is given for switching on the stabiliser with the corresponding number of the switch contact or, if the input voltage readings lie outside the permissible range, an instruction is given for indication of the accident mode. To determine input voltage and control operation of the stabiliser in nominal operation mode, the microcontroller calculates the value of input voltage based on the reading of the output voltage sensor and the number of the closed switch contact. To determine input voltage and control operation in emergency mode, the microcontroller, based on the reading of the output voltage sensor and number of one of the two extreme contacts of the closed switch, calculates the critical value of input voltage which is outside the permissible range and gives an instruction for switching off the stabiliser and an instruction for indication of the accident mode. In accident mode, like in the on mode, based on the reading of the output voltage sensor, the microcontroller determines the input voltage reading, and if it lies within the permissible range, it gives an instruction for switching on the stabiliser with the corresponding number of the switch contact. The proposed regulator simplifies design of the stabiliser, increases reliability and reduces cost.

EFFECT: use of the control device increases reliability due to considerable reduction of the number of discrete electronic components and processing a considerable number of emergencies, as well as increased accuracy of measurement and amount of displayed information, and reduced cost.

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