Solid State Relays and Isolators

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About solid-state relays and isolators

Infineon offers isolators and relays using either photovoltaic (PV) technology or magnetically-coupled coreless transformer (CT) technology.

  • Solid-state isolators: Isolated, low-power DC voltage sources capable of driving MOSFET or IGBT gates directly. Solid-State Isolators transfer signals and energy across the isolation barrier
  • Solid-state relays (SSR): A solid-state isolator with a power MOSFET or IGBT
About photovoltaic relays

Infineon’s photovoltaic isolators (PVI) offer single and dual-channel, optically-isolated outputs that can be used to directly drive the gates of discrete power MOSFETs or IGBTs. This range of devices gives designers the flexibility to create custom solid-state relays capable of controlling loads in excess of more than 1000 V and 10 A. 

Photo-voltaic isolators employ fast turn-off circuitry. No power supply is needed on the output side unlike conventional MOSFET or IGBT drivers. The dual-channel PVI can drive independent discrete power MOSFETs or provide higher voltage drive for IGBTs.

About photovoltaic relays

Infineon photovoltaic relays (PVR) are remotely-controlled switches with complete galvanic isolation from input to output. No power supply is needed on the output. PVRs are suitable for switching low-level signal loads in instrumentation and data acquisition to medium power loads in industrial controls and process automation. This includes switching from microvolts and microamps to 400 V (AC peak or DC) and up to 6.0 A of load current at a contact resistance as low as 15 milliohms. PVRs utilize power MOSFETs or IGBTs as the output switches, driven by an integrated circuit photovoltaic generator. The output switch is controlled by radiation from an LED, which is optically isolated from the photovoltaic generator. This isolation protects users from electrical shocks and electronics like microprocessors from damage caused by high-voltage spikes.

About coreless transformer technology

Infineon's solid-state isolators are based on magnetically-coupled coreless transformer (CT) technology which provides powerful energy transmission over a galvanic isolation barrier. Power supply is not needed for the output. This family offers various integrated features such as fast turn-on, fast turn-off, overcurrent protection, and overtemperature protection. SSIs are a perfect match for CoolMOS™, OptiMOS™, TRENCHSTOP™ IGBT, or CoolSiC™ devices. This range of devices gives designers the flexibility to create custom solid-state relays (SSR) capable of controlling loads beyond 1000 V and 200 A. The ability to drive low-RDS(ON) switches like Infineon’s CoolMOS™ S7 MOSFETs reduces the power dissipation needed in high power applications, thus reducing heat sink size and overall system cost.

About solid-state relays and isolators

Infineon offers isolators and relays using either photovoltaic (PV) technology or magnetically-coupled coreless transformer (CT) technology.

  • Solid-state isolators: Isolated, low-power DC voltage sources capable of driving MOSFET or IGBT gates directly. Solid-State Isolators transfer signals and energy across the isolation barrier
  • Solid-state relays (SSR): A solid-state isolator with a power MOSFET or IGBT

About photovoltaic relays

Infineon’s photovoltaic isolators (PVI) offer single and dual-channel, optically-isolated outputs that can be used to directly drive the gates of discrete power MOSFETs or IGBTs. This range of devices gives designers the flexibility to create custom solid-state relays capable of controlling loads in excess of more than 1000 V and 10 A. 

Photo-voltaic isolators employ fast turn-off circuitry. No power supply is needed on the output side unlike conventional MOSFET or IGBT drivers. The dual-channel PVI can drive independent discrete power MOSFETs or provide higher voltage drive for IGBTs.

About photovoltaic relays

Infineon photovoltaic relays (PVR) are remotely-controlled switches with complete galvanic isolation from input to output. No power supply is needed on the output. PVRs are suitable for switching low-level signal loads in instrumentation and data acquisition to medium power loads in industrial controls and process automation. This includes switching from microvolts and microamps to 400 V (AC peak or DC) and up to 6.0 A of load current at a contact resistance as low as 15 milliohms. PVRs utilize power MOSFETs or IGBTs as the output switches, driven by an integrated circuit photovoltaic generator. The output switch is controlled by radiation from an LED, which is optically isolated from the photovoltaic generator. This isolation protects users from electrical shocks and electronics like microprocessors from damage caused by high-voltage spikes.

About coreless transformer technology

Infineon's solid-state isolators are based on magnetically-coupled coreless transformer (CT) technology which provides powerful energy transmission over a galvanic isolation barrier. Power supply is not needed for the output. This family offers various integrated features such as fast turn-on, fast turn-off, overcurrent protection, and overtemperature protection. SSIs are a perfect match for CoolMOS™, OptiMOS™, TRENCHSTOP™ IGBT, or CoolSiC™ devices. This range of devices gives designers the flexibility to create custom solid-state relays (SSR) capable of controlling loads beyond 1000 V and 200 A. The ability to drive low-RDS(ON) switches like Infineon’s CoolMOS™ S7 MOSFETs reduces the power dissipation needed in high power applications, thus reducing heat sink size and overall system cost.

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