ON Semiconductor’s Automotive Semiconductor Solutions Make Vehicles Smarter, Safer, Greener, and Energy Efficient

The advancement of trends such as vehicle intelligence, autonomous driving, and electrification of electric vehicles/vehicle functions is making vehicles safer, more comfortable, environmentally friendly and energy efficient. Semiconductors are the key to enabling these innovations. As one of the world’s top 10 automotive semiconductor suppliers, ON Semiconductor provides a comprehensive range of innovative automotive-grade semiconductor solutions and technologies for autonomous driving, automotive functional electronics, traditional powertrain, lighting and body electronics, enabling cars and drivers. The relationship is stronger, safer, more efficient, and committed to zero defects, zero emissions, keeping cars on the road safe and the planet cleaner.

Providing high-quality automotive solutions for more than fifty years and providing holistic solutions for the cars of the future

Since 2010, ON Semiconductor has shipped 130 billion automotive semiconductor products to automotive customers. In 2019, more than 230 devices were used by ON Semiconductor for every car produced in the world. In addition, ON Semiconductor is also committed to promoting a zero-defect quality culture, with market-leading quality measured in defects per billion devices, and in image sensors, ultrasonic sensor interfaces, LED headlamps, MOSFET power modules, ignition IGBT is the world’s largest supplier of automotive power MOSFETs and discrete IGBTs.

ON Semiconductor has shipped more than 120 million image sensors to date for advanced driver assistance system (ADAS) applications, and more than 400 million automotive sensors, some of which have been on the road for more than 13 years. Future cars will combine ultrasonic, imaging, LiDAR, radar, sensor fusion, artificial intelligence (AI) and other technologies, and with the rise of shared cars and the development of autonomous driving, cars are required to be not only reliable but also trustworthy , functional safety has become critical, coupled with the popularity of the Internet of Vehicles, network security is also particularly important. ON Semiconductor has comprehensive sensing technologies and focuses on functional safety and network security, providing a complete and credible solution for vehicle interior sensing and exterior sensing.

ADAS/Autonomous Driving Solution

ADAS/autonomous driving is the core technology to achieve zero accident, zero fatality and zero distraction, and various sensors are the main technology in these systems. For example, image sensors provided by ON Semiconductor, used in autonomous driving systems, are expected to save 9 lives per hour, or 81,000 lives per year. With the gradual improvement of autonomous driving from L1 to L5, the number and types of sensors are constantly increasing. The car of the future can be defined as a computer on four wheels with extremely powerful perception capabilities. Its increasingly rich, comprehensive and powerful perception systems will far exceed human perception speed and response, including ADAS cameras, reversing cameras, 360-degree surround view, surveillance, Electronic mirrors, driver monitoring, flight attendant monitoring, ultrasonic, millimeter wave Radar and lidar, etc., can continuously monitor the surrounding environment every second and every second, so as to achieve safer driving. ON Semiconductor provides comprehensive intelligent perception solutions for the entire vehicle, including imaging, ultrasonic, millimeter-wave radar, lidar and sensor fusion, as well as other automotive-grade devices such as diodes, low-dropout regulators (LDOs), power management ICs, etc. And in-vehicle network and advanced automotive lighting solutions, so as to provide customers with one-stop service and optimized system design solutions.

ON Semiconductor’s Automotive Semiconductor Solutions Make Vehicles Smarter, Safer, Greener, and Energy Efficient

Figure 1: Autonomous Driving with Sensor Fusion

Automotive imaging can be divided into those for human eyes and those for machine vision. In the parts for human eyes to observe, such as driver, passenger, rear view, surround view, and electronic rear view mirror, imaging challenges include: the real world often faces Wide dynamic scenarios (>120 dB), extreme conditions with wide temperature range (-40 °C to +105 °C), LED traffic light/signal flickering is difficult to discern. In the imaging sensor industry, ON Semiconductor has a long history of more than 40 years (mainly through mergers and acquisitions), has more than 2000 imaging patents, especially accounts for >60% market share in the global automotive imaging market, and provides products ranging from VGA to 12 million Pixel complete product line, Wide Dynamic Range (HDR) + Reduced LED Flicker (LFM) sensor architecture, Optimized Color Filter Array (CFA), Time and Drive Test Certified WDR, 4th Generation ISO26262/Automotive Functional Safety Rating Class C (ASIL C), the world’s first image sensor with cybersecurity capabilities, such as the Hayabusa series with the highest wide dynamic effects on the market, addresses these challenges.

In the automotive perception segment, that is, perception systems for artificial intelligence and machine vision, ON Semiconductor accounts for >80% of the global market share, and it is expanding year by year. ON Semiconductor’s laser radar (LiDAR) is based on silicon photomultiplier (SiPM). Compared with traditional avalanche photodiode (APD), the gain of SiPM is 10,000 times that of APD, and the sensitivity is 2,000 times that of APD. As low as 30V, the consistency is very good, suitable for mass production, and meets the needs of automotive LiDAR landing sensors. ON Semiconductor provides automotive-grade single-point SiPM, linear array 1×12, 1×16 SiPM, and its latest Pandion single-photon avalanche diode (SPAD) 400×100 area array can fully realize images with depth information in the future.

ON Semiconductor’s Automotive Semiconductor Solutions Make Vehicles Smarter, Safer, Greener, and Energy Efficient

Figure 2: Overview of ON Semiconductor’s LiDAR Product Demonstration Platform

Millimeter-wave radar has different applications at different levels of autonomous driving. ON Semiconductor’s next-generation millimeter-wave radar uses MIMO+, which can provide 4-dimensional information for L3-level autonomous driving, double the number of channels compared to competitors, save 50% mmIC devices, reduce optimization controllers, circuit boards, Reduce total cost.

Smart cockpits are also gaining importance, including driver identification, swivel seat position, air conditioning temperature, user favorite radio stations, and passenger monitoring. Design challenges include: limited space in the car and camera size, light conditions For the strict requirements of automotive imaging, system cost, etc., ON Semiconductor and its partners have developed a very small camera of 0.5×0.5cm3, which is basically invisible to passengers and drivers in the car, and has excellent Infrared response and global shutter efficiency, a comprehensive product line from VGA to 2 megapixels provides a complete smart cockpit solution and ecosystem.

Electric Vehicle/Automotive Function Electronics Solution

The electronic function of automobiles is a key technology for energy conservation, emission reduction and reduction of dependence on oil. Driven by a series of policies such as government energy-saving and environmental protection regulations and new infrastructure, automobiles are rapidly moving towards the development of electric vehicles. ON Semiconductor is a leader in automotive functional electronics, providing comprehensive solutions including advanced silicon carbide (SiC), IGBTs, high voltage gate drivers, high voltage rectifiers, super junction MOSFETs, high voltage DC-DC, etc., as well as advanced packaging technology Such as single/double-sided cooling and double-sided direct cooling package for traction inverter, on-board charging, 48 V, auxiliary motor control, high voltage load and other systems.

ON Semiconductor’s Automotive Semiconductor Solutions Make Vehicles Smarter, Safer, Greener, and Energy Efficient

Figure 3: ON Semiconductor provides a comprehensive solution for automotive functional electronics

The traction inverter is a key part of the electric vehicle powertrain, and is responsible for converting the DC voltage of the high-voltage battery (350-800 VDC) to the AC voltage of the three-phase AC sinusoidal current, which in turn rotates the induction motor and drives the vehicle forward. The performance of this module affects the overall energy efficiency of the vehicle, including acceleration and driving range. ON Semiconductor provides energy-efficient, reliable and cost-competitive traction inverter solutions and advanced packaging technologies, including discrete IGBTs, SiC MOSFETs, isolated gate drivers and innovative VE-Trac series modules to help increase electric power The mileage of the car, thereby helping to increase the market share of electric vehicles. The VE-Trac family of modules includes VE-Trac Dual and VE-Trac Direct, delivering market-leading electrical and thermal performance while providing scalability and automotive reliability for the rapidly growing traction inverter market. Among them, VE-Trac Dual is a double-sided cooling module suitable for applications from 80 kW to 300 kW, providing the lowest cost per kW, with the advantages of scalable, low stray inductance, VE-Trac Direct with innovative and reliable pressure The combined pin directly replaces the existing traditional products. For 800 V battery electric vehicle systems, SiC MOSFETs offer superior switching performance and higher reliability than silicon, with low on-resistance and compact die size, ensuring low capacitance and gate charge. These features bring system advantages, including high energy efficiency, fast operating frequency, higher power density, lower electromagnetic interference (EMI), and the convenience of a smaller footprint.

Electric/hybrid vehicles can charge their high-voltage battery subsystems through DC charging piles or ordinary AC power sockets, and the on-board charger (OBC) is the core system for AC charging. ON Semiconductor offers a wide range of super junction MOSFETs, IGBTs, gate drivers, and more, with integrated solutions for trends such as bidirectional charging (V2X) between EV batteries and a building or grid and challenges such as power levels and footprints SiC hybrid IGBT, SiC MOSFET, and automotive power module (APM) are used in various power stages such as PFC, DC-DC, rectification, auxiliary power supply, and drive for on-board charging to improve energy efficiency, performance, power density, and reduce loss and occupation. bit space, while actively expanding the existing product lineup, launching OBC development kits for mainstream power classes such as 3.3 kW, 6.6 kW, 11 kW, etc., to help speed up design and evaluation.

1: Overview of ON Semiconductor’s on-board charging solutions

An emerging technology in the electric/hybrid vehicle arena is the 48 V dual voltage architecture mild hybrid electric vehicle (MHEV) system, which can provide many of the fuel economy benefits of a full hybrid vehicle at a cost and complexity greater than conventional Fuel vehicles only increased slightly. ON Semiconductor offers a broad lineup of medium-voltage power MOSFET discretes and modules with advanced core packaging technology for 48 V applications for 48 V lithium-ion battery packs, integrated starter generators (ISGs) or 48 V dual voltage systems. Different power requirements and voltage levels for each subsystem such as belt starter generator (BSG), 48 V load, 12 V battery, 12 V load, etc.

Subsystems such as electric superchargers, AC compressors, electric power steering (EPS), anti-roll, cooling fans, hydraulic pumps, air-conditioning compressors and PTC heaters in electric/hybrid vehicles require high-voltage auxiliary power solutions. ON Semiconductor’s automotive high-voltage ASPM modules feature ultra-low thermal resistance (<0.37 K/W) in a direct-clad copper (DBC) package, and integrate IGBTs (with optimized gate drive), high-speed HVICs, and rich protection features with integrated High temperature, compact form factor, guaranteed 175°C junction temperature, excellent robustness, long service life, short design cycle and assembly process, automotive certification, etc., more compact than discrete solutions, and better heat dissipation, And provide a strong isolation voltage, the overall cost performance is also improved. The 650 V [email protected] series and the 1200 V [email protected] series are for battery systems below 400 V and applications where the battery voltage is slightly higher but lower than 800 V, respectively.

Body electronics and interior

The Body Control Module (BCM) has become the information management and communication center of today’s light-duty vehicles. These modules manage body electronics and various loads in the vehicle, including applications such as window/door/mirror/seat/lighting/in-vehicle climate control and remote keyless entry, while providing diagnostics in the process and driving functions for the electric motor (DC, PWM), thus replacing the existing electromechanical relays. ON Semiconductor offers a broad lineup of pre-drivers, stepper motor drivers, gate drivers, SmartFETs and in-vehicle networking solutions with high energy efficiency and high reliability.

Today’s in-vehicle air conditioning systems are no longer mechanically controlled. The need for improved energy efficiency, comfort and performance has driven the adoption of more sophisticated technology and electronics in heating, ventilation and air conditioning (HVAC) systems. Multiple inputs from various sensors and passenger demands require control of different types of motors. ON Semiconductor offers a wide range of DC motor drivers, brushless DC motor (BLDC) drivers, stepper motor drivers, gate drivers and in-vehicle networking solutions to make HVAC control modules more efficient.

Summarize

As one of the world’s top 10 automotive semiconductor suppliers, ON Semiconductor provides comprehensive solutions for autonomous driving, automotive functional electronics, traditional powertrain, lighting and body electronics, leveraging expertise in automotive perception, power devices and other fields. Known to continuously develop innovative solutions, including leading power modules and advanced SiC solutions, etc., to advance the process of autonomous driving, electronic vehicle functions/electric vehicles, and adhere to strict quality standards, committed to zero defects and zero emissions , zero accidents, zero fatalities and zero distractions, while actively working with multiple ecological partners in the industry to build an ecosystem to help developers solve design challenges and make future cars smarter, safer, more comfortable, environmentally friendly and energy efficient.

The advancement of trends such as vehicle intelligence, autonomous driving, and electrification of electric vehicles/vehicle functions is making vehicles safer, more comfortable, environmentally friendly and energy efficient. Semiconductors are the key to enabling these innovations. As one of the world’s top 10 automotive semiconductor suppliers, ON Semiconductor provides a comprehensive range of innovative automotive-grade semiconductor solutions and technologies for autonomous driving, automotive functional electronics, traditional powertrain, lighting and body electronics, enabling cars and drivers. The relationship is stronger, safer, more efficient, and committed to zero defects, zero emissions, keeping cars on the road safe and the planet cleaner.

Providing high-quality automotive solutions for more than fifty years and providing holistic solutions for the cars of the future

Since 2010, ON Semiconductor has shipped 130 billion automotive semiconductor products to automotive customers. In 2019, more than 230 devices were used by ON Semiconductor for every car produced in the world. In addition, ON Semiconductor is also committed to promoting a zero-defect quality culture, with market-leading quality measured in defects per billion devices, and in image sensors, ultrasonic sensor interfaces, LED headlamps, MOSFET power modules, ignition IGBT is the world’s largest supplier of automotive power MOSFETs and discrete IGBTs.

ON Semiconductor has shipped more than 120 million image sensors to date for advanced driver assistance system (ADAS) applications, and more than 400 million automotive sensors, some of which have been on the road for more than 13 years. Future cars will combine ultrasonic, imaging, LiDAR, radar, sensor fusion, artificial intelligence (AI) and other technologies, and with the rise of shared cars and the development of autonomous driving, cars are required to be not only reliable but also trustworthy , functional safety has become critical, coupled with the popularity of the Internet of Vehicles, network security is also particularly important. ON Semiconductor has comprehensive sensing technologies and focuses on functional safety and network security, providing a complete and credible solution for vehicle interior sensing and exterior sensing.

ADAS/Autonomous Driving Solution

ADAS/autonomous driving is the core technology to achieve zero accident, zero fatality and zero distraction, and various sensors are the main technology in these systems. For example, image sensors provided by ON Semiconductor, used in autonomous driving systems, are expected to save 9 lives per hour, or 81,000 lives per year. With the gradual improvement of autonomous driving from L1 to L5, the number and types of sensors are constantly increasing. The car of the future can be defined as a computer on four wheels with extremely powerful perception capabilities. Its increasingly rich, comprehensive and powerful perception systems will far exceed human perception speed and response, including ADAS cameras, reversing cameras, 360-degree surround view, surveillance, Electronic mirrors, driver monitoring, flight attendant monitoring, ultrasonic, millimeter wave Radar and lidar, etc., can continuously monitor the surrounding environment every second and every second, so as to achieve safer driving. ON Semiconductor provides comprehensive intelligent perception solutions for the entire vehicle, including imaging, ultrasonic, millimeter-wave radar, lidar and sensor fusion, as well as other automotive-grade devices such as diodes, low-dropout regulators (LDOs), power management ICs, etc. And in-vehicle network and advanced automotive lighting solutions, so as to provide customers with one-stop service and optimized system design solutions.

ON Semiconductor&#8217;s Automotive Semiconductor Solutions Make Vehicles Smarter, Safer, Greener, and Energy Efficient

Figure 1: Autonomous Driving with Sensor Fusion

Automotive imaging can be divided into those for human eyes and those for machine vision. In the parts for human eyes to observe, such as driver, passenger, rear view, surround view, and electronic rear view mirror, imaging challenges include: the real world often faces Wide dynamic scenarios (>120 dB), extreme conditions with wide temperature range (-40 °C to +105 °C), LED traffic light/signal flickering is difficult to discern. In the imaging sensor industry, ON Semiconductor has a long history of more than 40 years (mainly through mergers and acquisitions), has more than 2000 imaging patents, especially accounts for >60% market share in the global automotive imaging market, and provides products ranging from VGA to 12 million Pixel complete product line, Wide Dynamic Range (HDR) + Reduced LED Flicker (LFM) sensor architecture, Optimized Color Filter Array (CFA), Time and Drive Test Certified WDR, 4th Generation ISO26262/Automotive Functional Safety Rating Class C (ASIL C), the world’s first image sensor with cybersecurity capabilities, such as the Hayabusa series with the highest wide dynamic effects on the market, addresses these challenges.

In the automotive perception segment, that is, perception systems for artificial intelligence and machine vision, ON Semiconductor accounts for >80% of the global market share, and it is expanding year by year. ON Semiconductor’s laser radar (LiDAR) is based on silicon photomultiplier (SiPM). Compared with traditional avalanche photodiode (APD), the gain of SiPM is 10,000 times that of APD, and the sensitivity is 2,000 times that of APD. As low as 30V, the consistency is very good, suitable for mass production, and meets the needs of automotive LiDAR landing sensors. ON Semiconductor provides automotive-grade single-point SiPM, linear array 1×12, 1×16 SiPM, and its latest Pandion single-photon avalanche diode (SPAD) 400×100 area array can fully realize images with depth information in the future.

ON Semiconductor&#8217;s Automotive Semiconductor Solutions Make Vehicles Smarter, Safer, Greener, and Energy Efficient

Figure 2: Overview of ON Semiconductor’s LiDAR Product Demonstration Platform

Millimeter-wave radar has different applications at different levels of autonomous driving. ON Semiconductor’s next-generation millimeter-wave radar uses MIMO+, which can provide 4-dimensional information for L3-level autonomous driving, double the number of channels compared to competitors, save 50% mmIC devices, reduce optimization controllers, circuit boards, Reduce total cost.

Smart cockpits are also gaining importance, including driver identification, swivel seat position, air conditioning temperature, user favorite radio stations, and passenger monitoring. Design challenges include: limited space in the car and camera size, light conditions For the strict requirements of automotive imaging, system cost, etc., ON Semiconductor and its partners have developed a very small camera of 0.5×0.5cm3, which is basically invisible to passengers and drivers in the car, and has excellent Infrared response and global shutter efficiency, a comprehensive product line from VGA to 2 megapixels provides a complete smart cockpit solution and ecosystem.

Electric Vehicle/Automotive Function Electronics Solution

The electronic function of automobiles is a key technology for energy conservation, emission reduction and reduction of dependence on oil. Driven by a series of policies such as government energy-saving and environmental protection regulations and new infrastructure, automobiles are rapidly moving towards the development of electric vehicles. ON Semiconductor is a leader in automotive functional electronics, providing comprehensive solutions including advanced silicon carbide (SiC), IGBTs, high voltage gate drivers, high voltage rectifiers, super junction MOSFETs, high voltage DC-DC, etc., as well as advanced packaging technology Such as single/double-sided cooling and double-sided direct cooling package for traction inverter, on-board charging, 48 V, auxiliary motor control, high voltage load and other systems.

ON Semiconductor&#8217;s Automotive Semiconductor Solutions Make Vehicles Smarter, Safer, Greener, and Energy Efficient

Figure 3: ON Semiconductor provides a comprehensive solution for automotive functional electronics

The traction inverter is a key part of the electric vehicle powertrain, and is responsible for converting the DC voltage of the high-voltage battery (350-800 VDC) to the AC voltage of the three-phase AC sinusoidal current, which in turn rotates the induction motor and drives the vehicle forward. The performance of this module affects the overall energy efficiency of the vehicle, including acceleration and driving range. ON Semiconductor provides energy-efficient, reliable and cost-competitive traction inverter solutions and advanced packaging technologies, including discrete IGBTs, SiC MOSFETs, isolated gate drivers and innovative VE-Trac series modules to help increase electric power The mileage of the car, thereby helping to increase the market share of electric vehicles. The VE-Trac family of modules includes VE-Trac Dual and VE-Trac Direct, delivering market-leading electrical and thermal performance while providing scalability and automotive reliability for the rapidly growing traction inverter market. Among them, VE-Trac Dual is a double-sided cooling module suitable for applications from 80 kW to 300 kW, providing the lowest cost per kW, with the advantages of scalable, low stray inductance, VE-Trac Direct with innovative and reliable pressure The combined pin directly replaces the existing traditional products. For 800 V battery electric vehicle systems, SiC MOSFETs offer superior switching performance and higher reliability than silicon, with low on-resistance and compact die size, ensuring low capacitance and gate charge. These features bring system advantages, including high energy efficiency, fast operating frequency, higher power density, lower electromagnetic interference (EMI), and the convenience of a smaller footprint.

Electric/hybrid vehicles can charge their high-voltage battery subsystems through DC charging piles or ordinary AC power sockets, and the on-board charger (OBC) is the core system for AC charging. ON Semiconductor offers a wide range of super junction MOSFETs, IGBTs, gate drivers, and more, with integrated solutions for trends such as bidirectional charging (V2X) between EV batteries and a building or grid and challenges such as power levels and footprints SiC hybrid IGBT, SiC MOSFET, and automotive power module (APM) are used in various power stages such as PFC, DC-DC, rectification, auxiliary power supply, and drive for on-board charging to improve energy efficiency, performance, power density, and reduce loss and occupation. bit space, while actively expanding the existing product lineup, launching OBC development kits for mainstream power classes such as 3.3 kW, 6.6 kW, 11 kW, etc., to help speed up design and evaluation.

1: Overview of ON Semiconductor’s on-board charging solutions

An emerging technology in the electric/hybrid vehicle arena is the 48 V dual voltage architecture mild hybrid electric vehicle (MHEV) system, which can provide many of the fuel economy benefits of a full hybrid vehicle at a cost and complexity greater than conventional Fuel vehicles only increased slightly. ON Semiconductor offers a broad lineup of medium-voltage power MOSFET discretes and modules with advanced core packaging technology for 48 V applications for 48 V lithium-ion battery packs, integrated starter generators (ISGs) or 48 V dual voltage systems. Different power requirements and voltage levels for each subsystem such as belt starter generator (BSG), 48 V load, 12 V battery, 12 V load, etc.

Subsystems such as electric superchargers, AC compressors, electric power steering (EPS), anti-roll, cooling fans, hydraulic pumps, air-conditioning compressors and PTC heaters in electric/hybrid vehicles require high-voltage auxiliary power solutions. ON Semiconductor’s automotive high-voltage ASPM modules feature ultra-low thermal resistance (<0.37 K/W) in a direct-clad copper (DBC) package, and integrate IGBTs (with optimized gate drive), high-speed HVICs, and rich protection features with integrated High temperature, compact form factor, guaranteed 175°C junction temperature, excellent robustness, long service life, short design cycle and assembly process, automotive certification, etc., more compact than discrete solutions, and better heat dissipation, And provide a strong isolation voltage, the overall cost performance is also improved. The 650 V [email protected] series and the 1200 V [email protected] series are for battery systems below 400 V and applications where the battery voltage is slightly higher but lower than 800 V, respectively.

Body electronics and interior

The Body Control Module (BCM) has become the information management and communication center of today’s light-duty vehicles. These modules manage body electronics and various loads in the vehicle, including applications such as window/door/mirror/seat/lighting/in-vehicle climate control and remote keyless entry, while providing diagnostics in the process and driving functions for the electric motor (DC, PWM), thus replacing the existing electromechanical relays. ON Semiconductor offers a broad lineup of pre-drivers, stepper motor drivers, gate drivers, SmartFETs and in-vehicle networking solutions with high energy efficiency and high reliability.

Today’s in-vehicle air conditioning systems are no longer mechanically controlled. The need for improved energy efficiency, comfort and performance has driven the adoption of more sophisticated technology and electronics in heating, ventilation and air conditioning (HVAC) systems. Multiple inputs from various sensors and passenger demands require control of different types of motors. ON Semiconductor offers a wide range of DC motor drivers, brushless DC motor (BLDC) drivers, stepper motor drivers, gate drivers and in-vehicle networking solutions to make HVAC control modules more efficient.

Summarize

As one of the world’s top 10 automotive semiconductor suppliers, ON Semiconductor provides comprehensive solutions for autonomous driving, automotive functional electronics, traditional powertrain, lighting and body electronics, leveraging expertise in automotive perception, power devices and other fields. Known to continuously develop innovative solutions, including leading power modules and advanced SiC solutions, etc., to advance the process of autonomous driving, electronic vehicle functions/electric vehicles, and adhere to strict quality standards, committed to zero defects and zero emissions , zero accidents, zero fatalities and zero distractions, while actively working with multiple ecological partners in the industry to build an ecosystem to help developers solve design challenges and make future cars smarter, safer, more comfortable, environmentally friendly and energy efficient.

The Links:   FRS200BA60 SKM400GB125D PM100RSE120

Author: Yoyokuo