STEVAL-IHT008V1:Low standby loss front-end with inrush current limitation and insulated AC switch control

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.

Key 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
Product Specifications
DescriptionVersionSize
DB2822: Low standby loss front-end with inrush current limitation and insulated AC switch control1.0316 KB
User Manuals
DescriptionVersionSize
UM2027: Inrush current limitation when charging a DC bus capacitor for IEC 61000-3-3 compliance1.02 MB
Board Manufacturing Specifications
DescriptionVersionSize
STEVAL-IHT008V1 gerber files1.0323 KB
Bill of Materials
DescriptionVersionSize
STEVAL-IHT008V1 BOM1.017 KB
Schematic Packs
DescriptionVersionSize
STEVAL-IHT008V1 schematic1.0102 KB
License Agreement
DescriptionVersionSize
Evaluation products license agreement1.0125 KB
Evaluation Tool Software
Part NumberManufacturerDescription
STSW-IHT008STSTEVAL-IHT008V1 firmware
Sample & Buy
Part NumberCore ProductUnit Price (US$) *QuantityECCN (EU)ECCN (US)Country of Origin
STEVAL-IHT008V1-207.031NECEAR99ITALY
Quality & Reliability
Part NumberPackageGradeRoHS Compliance GradeMaterial Declaration**
STEVAL-IHT008V1CARDIndustrialEcopack2
Low standby loss front-end with inrush current limitation and insulated AC switch control STEVAL-IHT008V1
Inrush current limitation when charging a DC bus capacitor for IEC 61000-3-3 compliance STEVAL-IHT008V1
Inrush current limitation when charging a DC bus capacitor for IEC 61000-3-3 compliance STEVAL-IHT008V1
Inrush current limitation when charging a DC bus capacitor for IEC 61000-3-3 compliance STEVAL-IHT008V1
Inrush current limitation when charging a DC bus capacitor for IEC 61000-3-3 compliance STEVAL-IHT008V1
ST-LINK/V2 in-circuit debugger/programmer for STM8 and STM32 ST-LINK-V2