WPG Group launches ultrasonic oxygen concentration sensor module solution based on ST products

WPG Group launches ultrasonic oxygen concentration sensor module solution based on ST products

On March 21, 2023, WPG Holdings, a leading semiconductor component distributor dedicated to the Asia-Pacific market, announced that its subsidiary Youshang has launched an ultrasonic oxygen concentration sensor module solution based on the STMicroelectronics (ST) STM32F030K6T6 chip.

Figure 1- Physical diagram of DaLian DaYouShang's ultrasonic oxygen concentration sensor module solution based on ST products

Medical ventilators and oxygen concentrators are an effective medical treatment for respiratory failure and dysfunction. In the past three years, affected by the COVID-19 pandemic, the demand for medical ventilators and oxygen concentrators has increased dramatically. Today, although most countries in the world have implemented liberalization policies, the demand for ventilators and oxygen concentrators is still tight, and the market gap for oxygen concentration and flow sensors, which are key components in medical ventilators and oxygen concentrators, has long existed. Under this trend, Dalian Dayou has launched an ultrasonic oxygen concentration sensor module solution based on the ST STM32F030K6T6 chip, which can measure oxygen concentration and flow at the same time and achieve ultra-high accuracy.

Figure 2-Application scenario of the ultrasonic oxygen concentration sensor module solution of Dalian Dayoushang based on ST products

Ultrasonic technology (ultrasonic time difference method) uses a pair of ultrasonic transducers to send and receive ultrasonic waves alternately (or simultaneously) in opposite directions, and indirectly measures the flow velocity of the fluid by observing the propagation time difference of ultrasonic waves in the medium (gas or liquid) downstream and upstream, and then calculates the flow rate by the flow rate. Flow measurement using the ultrasonic principle depends only on the flow rate and geometry.

In order to accurately calculate the oxygen concentration and flow rate, the main control of this solution uses ST's STM32F030K6T6 MCU , which uses a high-performance core M0 48MHz 32-bit RISC core, high-speed embedded SRAM memory and a wide range of enhanced peripherals and I/O. The STM32F030K6T6 provides standard communication interfaces, a 12-bit ADC, seven general-purpose 16-bit timers and an advanced control PWM timer. The STM32F030K6T6 microcontroller has an operating voltage range of 2.4 to 3.6V and an operating temperature of -40℃ to +85℃. In response to low power consumption requirements, the STM32F030K6T6 provides a comprehensive power saving mode that can be used to design low-power applications.

In addition, in terms of power management, this solution also uses Shenzhen Xintian's ME6203 LDO voltage regulator, which has a built-in fixed reference voltage source, error correction circuit, phase compensation circuit and short-circuit protection circuit, which can provide safe power supply for the system while reducing system costs.

Figure 3-Block diagram of DaLian DaYouShang's ultrasonic oxygen concentration sensor module solution based on ST products

With the help of ultrasonic technology principles and STM32F030K6T6 , this solution can accurately measure the oxygen concentration and flow rate in binary gases. It has the characteristics of small size, fast response, accurate measurement, no drift in long-term use and long life.

Core technology advantages:

Using the STM32F030K6T6 main control chip, the price and performance complement each other, and the SDK driver provided by ST can be developed quickly;

 ME6203 implements low-cost LDO;

Measure oxygen concentration and flow rate simultaneously, full range temperature compensation meets CMC, CE, EMC, ROHS certification, with compact size and more flexible application.

Program Specifications:

Detection principle: ultrasonic measurement principle;

Detection range:

 O2 concentration: 0~100% (PSA oxygen concentrator O2 concentration: 20.5%~95.6%);

 O2 flow rate: 0~10L/min;

Detection accuracy:

 O2 concentration: ±1.5%FS@(5~45)℃;

 O2 flow rate: ±0.2L/min@(5~45)℃;

 Resolution:

 O2 concentration: 0.1%;

 O2 flow rate: 0.1L/min;

Response time: concentration: ≤1.5s, flow rate: ≤0.3s;

Working conditions: -5℃~50℃, 0~95%RH or less (non-condensing);

Storage conditions: -20℃~60℃, 0~95%RH (non-condensing);

Working voltage: DC 4.75V~12.6V, ripple <50mA;

Working current: average working current <35mA;

Signal output: UART_TTL (3.3V);

Product size: W80×H22×D25(mm).