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STEVAL-ISA147V3 Folha de dados(PDF) 2 Page - STMicroelectronics

Nome de Peças STEVAL-ISA147V3
Descrição Electrónicos  500 W fully digital AC-DC power supply (D-SMPS) based on STM32F334C8 microcontroller
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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STEVAL-ISA147V3
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Description continued
The DC-DC stage performs voltage step-down using an HF transformer with a primary to
secondary turn ratio chosen to maintain good efficiency and regulation over the entire
operating range. The transformer is supplied with a square wave voltage generated by the
primary side active switches. On the secondary side, this voltage waveform is rectified and
then smoothed by the output filter; on the primary side, switching losses are reduced
thanks to zero voltage switching (ZVS). On the secondary side, synchronous rectification
(SR) is used to ensure low conduction losses. The overall effect of these design choices is
high system efficiency, in line with the stringent requirements of the power supply industry.
The system is controlled by two microcontrollers from the STM32 product family. On the
primary side, an STM32F051K8 controls the bridgeless PFC by sampling the current of the
two MOSFETs, the input AC voltage and the output bus voltage. Two control signals,
PWM1 and PWM2, are then generated to drive two power switches. On the secondary
side, an STM32F334C8 microcontroller samples the output voltage and adjusts the
frequency of the LLC bridge control signals to ensure stable operation throughout the
overall load range. In addition, two ADC channels are used to sample the rising and falling
edges of the drain-to-source voltage of the SR MOSFETs. The two microcontrollers
exchange information about the status of the input and output power stage via bidirectional
serial communication.
Both the power stage and control stage are supplied by an offline flyback circuit which
provides a suitable, regulated voltage to the microcontrollers, the gate drive ICs and signal
conditioning circuits.


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