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 ventilator system provides a portable ventilator used in hallway or non-ICU use cases. 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 would monitor the gas flow rate at the inhale tube and the tidal volume would be calculated by the MCU using the rate integrated with time. The oxygen valve would be controlled by the MCU and manage 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.

System Benefits:

  • 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 FS1015
  • The oxygen ratio is controlled by the valve, which is controlled by the MCU, and monitored by the flow sensor
  • The exhale pressure is controlled by MCU through the exhale valve
  • The oxygen sensor is used to test FiO2 (fraction of inspired oxygen)
  • The blower is controlled via pressure/flow sensor feedback
  • The LCD brightness is controlled by the light sensor monitoring ambient light
  • Features a battery balance monitor to extend battery lifetime



Winning Combinations Interactive Diagram

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4:3 ratio Sheet.1 Sheet.2 Sheet.3 Sheet.4 US083 US083 US083 MOSFET Bank MOSFET Bank MOSFET Bank LPF 2 LPF LPF Pressure Sensor (Proximal Air) Pressure Sensor (Proximal Air) Pressure Sensor (Proximal Air) Non-Renesas Component.23 Op Amp 1 Op Amp Op Amp Half-Bridge Driver x3 Half-Bridge Driver x3 Half-Bridge Driver x3 Sheet.63 Sheet.64 Sheet.65 Sheet.66 Sheet.67 Sheet.69 Sheet.70 Sheet.71 Sheet.72 Sheet.73 Sheet.74 Sheet.75 Sheet.76 Sheet.77 Sheet.78 Sheet.79 Sheet.80 Sheet.81 Sheet.82 Sheet.83 Sheet.84 Sheet.85 Sheet.86 Connector Arrow Sheet.113 Sheet.114 Sheet.102 Sheet.99 Sheet.100 Sheet.101 02 02 02 Connector Arrow.115 Sheet.116 Sheet.117 Sheet.121 Sheet.122 Connector 1.123 Sheet.124 Sheet.125 Connector 1.126 Sheet.127 Connector 1.128 Sheet.130 Sheet.131 Sheet.132 Sheet.133 Sheet.134 Sheet.135 Sheet.137 Sheet.138 Sheet.139 Sheet.140 Sheet.141 Sheet.143 Sheet.144 Sheet.145 Single Cell Sheet.147 Sheet.148 Line 1pt.1552 Line 1pt.1583 Sheet.152 Sheet.151 Sheet.87 24V 24V 24V Connector 1.154 Sheet.157 Sheet.158 Sheet.159 Sheet.160 Sheet.161 Sheet.162 Sheet.166 Sheet.167 Sheet.168 Sheet.169 Sheet.171 Sheet.172 Sheet.173 Sheet.175 Sheet.176 Connector 1.178 Sheet.179 Connector 1.180 5V 5V 5V Sheet.182 Sheet.183 Sheet.184 Sheet.185 Sheet.186 Sheet.188 Sheet.190 Sheet.193 Connector 1.194 Sheet.195 Sheet.199 Connector 1.200 Sheet.201 Sheet.202 Sheet.203 Sheet.204 Sheet.206 Sheet.207 Inhale Inhale Inhale Exhale Exhale Exhale *LPF stands for Low Pass Filter *LPF stands for Low Pass Filter *LPF stands for Low Pass Filter Connector double arrow Target Board Target Board Target Board Sheet.215 Sheet.217 Sheet.218 Sheet.219 Sheet.220 Sheet.221 3.3V 3.3V 3.3V Connector 1.223 Sheet.224 Sheet.225 Sheet.226 Connector 1.227 Connector 1.228 Connector 1.230 Connector 1.231 3.3V 3.3V 3.3V Connector 1.233 Sheet.236 Sheet.238 Sheet.239 Sheet.241 12V 12V 12V Sheet.243 Connector 1.244 Connector Hallow Arrow Buck Regulator 1 Buck Regulator Buck Regulator LDO 2 LDO LDO Sheet.296 Sheet.288 Sheet.289 Sheet.290 Sheet.291 Sheet.292 Sheet.293 Sheet.294 Sheet.295 MCU MCU 2 MCU MCU PWM PWM PWM I2C I2C I2C A/D A/D A/D BLE5.0 BLE5.0 BLE5.0 SPI SPI SPI GPIO/PWM GPIO/PWM GPIO/PWM GPIO GPIO GPIO I2C I2C I2C UART UART UART USB USB USB Sheet.302 Adaptor Adaptor Adaptor Buck Regulator 2 Buck Regulator Buck Regulator LDO 1 LDO LDO Battery Pack Monitor IC Battery Pack Monitor Battery Pack Monitor MCU 1 MCU MCU Buck-Boost Controller Buck-Boost Controller Buck-Boost Controller Light Sensor Light Sensor Light Sensor LCD Screen LCD Screen LCD Screen Buzzer and Key Buzzer & Key Buzzer & Key Fan Fan Fan Antenna Antenna Antenna USB USB USB UART to USB UART to USB UART to USB Debug USB Debug USB Debug USB Blower Blower Blower Valve 1 Valve Valve LPF 1 LPF LPF Valve 2 Valve Valve Pressure Sensor 2 Pressure Sensor Pressure Sensor Pressure Sensor 3 Pressure Sensor Pressure Sensor Pressure Sensor 1 Pressure Sensor Pressure Sensor Oxygen Sensor Oxygen Sensor Oxygen Sensor Op Amp 2 Op Amp Op Amp Humidifier Humidifier Humidifier Flow Sensor 1 Flow Sensor Flow Sensor Flow Sensor 2 Flow Sensor Flow Sensor
Exiting Interactive Block Diagram
Renesas Ventilator System Reference Design Demo

See a demo of the Renesas ventilator system reference design for portable ventilators used in a hallway or non-ICU cases.