Ventilator System Design

Renesas is helping this global cause by designing ready-to-assemble electronic boards for ventilators

Image of Renesas’ Winning Combination - Ventilator System DesignRenesas’ winning combination ventilator system reference design is a portable ventilator to be used in hallway or non-ICU use cases.

The COVID-19 pandemic has created havoc globally, putting more and more people in hospitals. The demand for ventilators is so high that doctors are creating makeshift ventilators to meet the demand. Many companies are contributing to the cause in various ways, including opening up their IPs. Renesas is also helping this global cause by designing ready-to-assemble electronic boards for ventilators.

This machine can provide high-pressure oxygen to patients in assist control and pressure control modes. The assist control mode provides a certain tidal volume of gas to a patient with each inhale. The flow sensor (FS1023) monitors the gas flow rate at the inhale tube and the tidal volume is calculated by the MCU using the rate integrated with time. The oxygen valve is controlled by the MCU and manages the oxygen ratio. The pressure control mode provides a certain pressure to the patient with each inhale. There is one proximal air pressure sensor connected to the mask to monitor the inhale pressure and send that information to the RX23W MCU. The blower, which provides pressure and blows air into the system, is driven by a motor control board that is controlled by the RX23T MCU. It uses I2C communication with the RX23W. A humidifier is added to the system to provide moist gas to the patient. The system uses two MCUs for higher safety, so these devices can monitor and reset each other.

Features
  • Secure system using two MCUs to monitor each other
  • System available for assist control mode and pressure control mode
  • Hardware is capable of providing low tidal volume, peak pressure, disconnect, and apnea alarms
  • Both gas volume and flow rate are monitored by the FS1023
  • Oxygen ratio is controlled by the valve which is controlled by the MCU and monitored by the flow sensor
  • Exhale pressure is controlled by MCU through the exhale valve
  • Oxygen sensor is used to test fraction of inspired oxygen (FiO2)
  • Blower is controlled via pressure/flow sensor feedback
  • LCD brightness is controlled by the light sensor monitoring ambient light
  • Battery balance monitor to extend battery lifetime 
  • RX23W MCUs
    • 32-bit microcontroller with Bluetooth® 5 for IoT endpoint devices, system control and wireless communication
  • RX23T MCUs
    • Microcontroller incorporating a floating point unit (FPU) best suited for controlling a single inverter
  • ISL9007 LDOs
    • 300 mA high-performance low-dropout (LDO)
    • Low quiescent current: 50 µA
    • Low output noise
  • ISL85410 LDOs
    • Wide voltage input synchronous buck regulator
  • ISL80410 buck regulators
    • 40 V low quiescent current, 150 mA linear regulator
  • ISL94202 battery pack monitor ICs
    • Stand-alone 3 to 8 cell Li-Ion battery pack monitor
  • ISL81601 buck-boost controllers
    • 60 V bidirectional four-switch buck-booster controller with current sensing and input/output monitoring
  • FS1023 sensors
    • Liquid/gas flow sensor module
  • ISL29034 sensors
    • Integrated digital light sensor
  • HIP2103 half-bridge drivers
    • 60 V 1 A/2 A peak, half-bridge driver with 4 V undervoltage lockout (UVLO)
  • ISL28148 op amps
    • 4.5 MHz, single precision rail-to-rail input-output (RRIO) op amp with very low input bias current
  • ISL28191 OP amps
    • Single supply ultra-low noise, low distortion rail-to-rail output (RRO) op amp

RX23W/RX23T MCUs

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
IC MCU 32BIT 512KB FLASH 56HVQFNR5F523W8ADNG#30IC MCU 32BIT 512KB FLASH 56HVQFN195 - ImmediateView Details
IC MCU 32BIT 128KB FLASH 48LFQFPR5F523T5ADFL#30IC MCU 32BIT 128KB FLASH 48LFQFP0View Details
IC MCU 32BIT 128KB FLASH 64LFQFPR5F523T5ADFM#30IC MCU 32BIT 128KB FLASH 64LFQFP0View Details

ISL9007/ISL85410 LDOs

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
IC REG LINEAR 2.8V 400MA 8MSOPISL9007IUJZIC REG LINEAR 2.8V 400MA 8MSOP0View Details
IC REG BUCK ADJ 1.2A 12DFNISL854102FRZ-T7AIC REG BUCK ADJ 1.2A 12DFN0View Details

ISL80410 Buck Regulators

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
IC REG LIN POS ADJ 150MA 8SOICISL80410IBEZ-T7AIC REG LIN POS ADJ 150MA 8SOIC9423 - ImmediateView Details

ISL94202 Battery Pack Monitor ICs

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
IC BAT MON MULT-CHEM 3-8C 48TQFNISL94202IRTZ-T7AIC BAT MON MULT-CHEM 3-8C 48TQFN2140 - ImmediateView Details

ISL81601 Buck-Boost Controllers

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
SWITCH SYNCH BUCK-BOOST PWMISL81601FRZ-T7ASWITCH SYNCH BUCK-BOOST PWM128 - ImmediateView Details

FS1023 Sensors

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
LIQUID FLOW SENSOR MODULE, AMPLIFS1023LIQUID FLOW SENSOR MODULE, AMPLI0View Details

HIP2103 Half-Bridge Drivers

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
IC GATE DRVR HALF-BRIDGE 8TDFNHIP2103FRTAAZ-T7AIC GATE DRVR HALF-BRIDGE 8TDFN0View Details

ISL28148/ISL28191 Op Amps

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
IC OPAMP GP 1 CIRCUIT SOT23-6ISL28148FHZ-T7AIC OPAMP GP 1 CIRCUIT SOT23-60View Details
IC OPAMP VFB 1 CIRCUIT SOT23-6ISL28191FHZ-T7IC OPAMP VFB 1 CIRCUIT SOT23-60View Details
IC OPAMP VFB 1 CIRCUIT 6UTDFNISL28191FRUZ-T7IC OPAMP VFB 1 CIRCUIT 6UTDFN926 - ImmediateView Details
Published: 2020-04-29