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STEVAL-IHT008V1 Datasheet, PDF (1/7 Pages) STMicroelectronics – DC bus disconnection at standby to reduce loss below 0.3 W
STEVAL-IHT008V1
Low standby loss front-end with inrush current limitation and
insulated AC switch control
Data brief
Features
 Fully electronic solution without the need for
an inrush current limiter resistor and bulky
by-pass electromechanical relay
 DC bus disconnection at standby to reduce
loss below 0.3 W
 Inrush current compliant with IEC61000-3-3
 Operation allowed with PFC (continuous or
discontinuous)
 EN 55015, IEC 61000-4-11 compliant
 Criteria A @ 2 kV IEC 61000-4-5 and @ 4
kV IEC 61000-4-4
 Insulated control of AC switches used to
drive AC loads for residential appliances
 RoHS compliant
Description
The STEVAL-IHT008V1 evaluation board limits
the inrush current charging a DC bus capacitor
so that it is compliant with the IEC 61000-3-3
standard. This inrush current is based on a soft-
start procedure for the rectifier bridge achieved
with a Triac added in series with the mains line,
which is controlled through progressive phase-
control during the startup phase.
This solution drastically reduces standby losses
as the DC bus can be totally disconnected from
the AC mains when it is not required. The DC bus
is easily turned off by turning off the series Triac,
without needing an additional relay to open the
circuit in standby.
Steady-state losses are also reduced because
NTC resistors, traditionally used to limit inrush
current, are not required; nor are the
corresponding relays to bypass them.
This board also demonstrates that AC loads can
be driven with an isolated easy-to-design solution
by using the same power supply as the whole
system and some opto-transistors which control
the AC switches.
February 2016
DocID028931 Rev 1
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