Another app note from STMicroelectronics on SCR or Triac hybrid with mechanical relay to decrease power loss and manage inrush current. Link here (PDF) This document gives some key information about the design of the solid-state silicon AC switch stage of a hybrid relay, which can drive resistive, capacitive or inductive AC loads, such as: […]
Tag Archives: AC switch
App note: AC switches – Is a positive power supply mandatory for my application, or could a negative output work also?
App note from STMicroelectronics about the usage of a negative supply in controlling AC switches and their benefits, Link here (PDF) In this application note we explain the reasons why some appliance designers might choose a positive power supply. This selection is based mainly on the choice of switched mode power supply (SMPS). Some specific […]
App note: How to select the Triac, ACS, or ACST that fits your application
Choosing the right AC switch for your application based on specification like current rating, voltage rating and triggering quadrant. Here’s an app note from STMicroelectronics to guide you on selecting the right part. Link here (PDF) This document gives basic guidelines to select the AC switch device according to the targeted application requirements. These guidelines […]
App note: A logic-level transient-voltage protected AC switch
STMicroelectronics’ AC switch directly controlled by microcontroller. Link here (PDF) Home appliances such as washing machines, refrigerators and dishwashers employ a lot of low power loads such as valves, door lock systems, dispensers or drain pumps. Since these loads are powered by the mains in ON / OFF mode, they were initially controlled by relays. […]
App note: AC switch triggering with 3.3 V power supply
Controlling AC switches from a 3.3V MCU pin, an app note (PDF) from ST. This document focuses on the calculation of gate current consumption of various types of AC switches when using a 3.3 V power supply. Until now, the standard of a 5 V power supply was used. In home appliance applications there is […]