METHOD TO CONTROL MULTIPHASE STEP-UP DC CONVERTER WITH INPUT CURRENT STABILISATION AND DEVICE FOR CONTROL MULTIPHASE STEP-UP DC CONVERTER WITH INPUT CURRENT STABILISATION Russian patent published in 2015 - IPC G05F1/563 

FIELD: electricity.

SUBSTANCE: based on pulse-width modulation of control signals the method to control multiphase step-up DC converter with input current stabilisation consists in generation of control signals by pulse-width modulation for high-frequency keys in each converter phase; to this end current values of current feedback signals in each phase are compared with their reference values, and on the basis of comparison results mismatch signals are generated, by means of these mismatch signals pulse-width modulated (PWM) signals of fixed frequency are generated. At that in each phase signals of input voltage are compared with threshold value in each phase additionally, and when input voltage has value less than the preset threshold value then by means of mismatch signal, against input voltage, the second PWM signal is generated with frequency of at least 4 times less than frequency of the first PWM signal, and the above second PWM signal is used to control keys of the respective converter phase till value of input voltage does not exceed the preset threshold value. The device for control multiphase step-up DC converter with input current stabilisation in each phase comprises input current sensor, comparison circuit for current sensor signals with reference signal and PWM-controller, to which input current mismatch signals are delivered and which outputs are coupled to key drivers in each phase of the converter. The device comprises additionally in each phase a voltage comparator that compares input voltage with threshold level, the second PWM-controller operating at frequency at least 4 times less than frequency of the first PWM-controller, and a selector coupled to the voltage comparator and switching the first or the second PWM-controller to key drivers in the respective controller phase depending on signal of the voltage comparator.

EFFECT: extended range of input voltage towards lower values with simultaneous stabilisation of input current by means of a simple and cost-effective circuit.

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