ON Semiconductor automotive technology and body and power system solutions
With the improvement of people's requirements for automobile comfort and other aspects, the importance of body electronic control and power is becoming increasingly prominent, and more and more cars are equipped with high-performance body control systems and advanced management systems. The increase and upgrade of such systems have opened up huge space for the application of semiconductor devices.
However, in the face of demands for environmental protection and rich consumer experience, as well as the most stringent specifications for automotive devices, manufacturers must pay more attention to the certification of reliability indicators in product design and manufacturing, on the other hand, they must also ensure that products are While providing higher performance, it meets the requirements of environmental protection and energy saving. This article will combine ON Semiconductor's automotive technology expertise to talk about various devices used in automotive body and power system solutions.
Advanced automotive technology
The increase in automotive electronics has made it impossible for various parts of the car to avoid parasitic signals, and even peak values ​​of 80 VV may occur. The automotive design team must take this into account. Modules and components used in automobiles need to be able to withstand such peaks and ensure proper function. ON Semiconductor leverages mature automotive technology capabilities to develop a set of specialized high-voltage automotive power supply technologies to implement complex high-voltage system-on-chip (SoC) solutions that meet the requirements of maximum voltage and digital gate integration.
At the same time, more and more electronic content in automobiles has higher and higher requirements on electromagnetic compatibility, and automobile manufacturers have also formulated corresponding performance standards, which are designed to make vehicle network (IVN) applications have higher anti-ESD pulse and EMI capability. ON Semiconductor uses the innovative I3T50 / I3T80 technology to provide the best first-class devices. It achieves advanced functions through deep trench isolation and other processes, while ensuring reliable design and reducing interference between different cell structures on the chip. .
A series of ON Semiconductor technologies allow the use of power supplies up to 100V, which is conducive to the integration of components-including embedded microprocessor cores. ON Semiconductor's automotive ASIC and application specific standard product (ASSP) solutions are widely used in powertrain (including high temperature applications with an ambient temperature ≥150 ° C), safety, body, instrument panel, IVN, sensor and driver applications.
ON Semiconductor is a major supplier in the automotive MOSFET market. In addition to the planar MOSFET product line, the company also offers 40 V and 60 V trench MOSFETs. Trench technology is optimized for low Rds ((on)) switching applications, and is more suitable for linear operating modes than planar technology.
ON Semiconductor body and convenient application solutions
Body electronics and convenience applications include climate control, smart junction boxes, headlamp adjustment and power control, wipers and light sensing, rearview mirror control, seat position / heating / cooling, door modules, steering wheel sensors, etc.
Here, the body heating, ventilation and air conditioning (HVAC) control, communication and power supply, and DC motor driver are introduced as examples.
1. Control, communication and power supply of body HVAC
HVAC includes multiple subsystems: One is the car heating and ventilation system. Fresh air is drawn into the cabin from the external duct; the incoming air can be heated by a small heating core connected to the engine cooling system. Its purpose is to improve passenger comfort and safety. The second is the air conditioning and refrigeration system, which transfers the heat in the car to the continuously evaporating and condensing outside air to reduce the temperature and humidity of the air. The third is the control head, that is, the ECU (Electronic Control Unit) with a user interface.
Figure 1 is a block diagram of HVAC, the green part of the figure will use a variety of ON Semiconductor devices. These devices include diodes and rectifiers for I / O protection; interfaces for transceivers or SBCs; IGBT / FETs and MOSFETs for motor pre-drivers (BLDC, BDC); loads / relays for stepper motor drives Drivers and interfaces; bipolar transistors / digital transistors (BRT) for control panels, interfaces, analog switches, standard logic, multiplexers; amplifiers and comparators for signal conditioning, operational amplifiers; for high-end drivers Drivers, load / relay drivers, IGBT / FET and MOSFET; diodes and rectifiers for power protection, small signal switching diodes, zener diodes, Schottky diodes; interfaces for voltage regulation (linear, switching), DC- Direct current (DC-DC) controllers, converters and regulators, controllers, linear regulators; DC-DC controllers, converters and regulators for monitoring; and loads for low-end drivers / Relay driver, IGBT / FET and MOSFET.
2. Body HVAC DC motor driver
Currently, the most popular flap actuators are simple DC motors that feed back position signals to microcontrollers. In order to control the forward and reverse directions of the DC motor, two high-end power stages and two low-end power stages in a full-bridge configuration must be used. Usually, these drivers integrate the required functions, such as overvoltage, overload and overtemperature protection. In addition, the SPI interface can provide diagnostic functions for the microcontroller.
The integrated pulse counting technology combined with additional signal conditioning blocks can replace discrete position potentiometers. In pulse counting applications, this circuit detects the commutation pulses of the DC motor and creates a pulse for each detected commutation pulse. Usually these pulses are fed back to the microcontroller for position detection and position control. ON Semiconductor's customized ASIC for such circuits has been put into production.
The six-way half-bridge driver NCV7708 is a flexible single-sided high / low-end driver. Its six high-end and low-end channels are dedicated to motor control configurations such as half-bridge or full-bridge. NCV7708 can control 5 DC motors through a 16-bit SPI interface. The device can also control relays or indicator lights. Figure 2 is a functional block diagram of the device.
The three-way half-bridge driver NCV7703 can control two DC motors. The internal connection of the power stage is used as a half-bridge, and the SO-14 packaged device can effectively reduce the number of pins. Figure 3 is a block diagram of the device.
3. Configurable motor, relay and Led Driver for body HVAC
NCV7608 has the greatest flexibility, can drive different types of motors and various loads, such as light bulbs, light-emitting diodes and relays. The NCV7608 has a special diagnostic current disable bit that prevents LEDs from emitting light, as well as standard diagnostic functions. Figure 4 is a functional block diagram of NCV7608.
The device is an 8-channel configurable low-end / high-end driver in a high-density SOIC-28W package that can operate at a junction temperature of -40 ° C to + 150 ° C. NCV7608 has a wide input voltage range of 3.15 V to 5.25 V, and has 8 completely independent output drivers, which can be arbitrarily configured as a combination of high-end, low-end, or half-bridge configurations, providing designers with extremely flexible solutions that need to drive large loads .
The device performs digital control of all output sections through an integrated standard serial peripheral interface. This feature also enables diagnostic fault information. In addition, 4 channels can be controlled by external control input pulse width modulation (PWM). The device's typical on-resistance (RDSON) at 25 ° C is only 1.2 Ω, which can greatly extend battery life.
The well-specified NCV7608 also provides positive / negative transient protection, overcurrent protection and overtemperature protection functions. Its integrated clamping circuit (in high-end and low-end operating modes) ensures over-temperature protection and under-voltage lockout. Using NCV7608 can support unipolar and bipolar stepper motor control, as shown in Figure 5.
ON Semiconductor Power System Solutions
The powertrain includes transmission control and position detection, engine control, throttle control, fuel level detection, air flow monitoring, valve control, fuel injection control, etc. Here is the solution of ON Semiconductor's engine management and fuel injection system.
1. Engine Management Solution
ON Semiconductor has developed a variety of customized and standard products for gasoline engines, bi / flexfuel and diesel engines, covering a wide range of applications from ignition control air and fuel supply to exhaust aftertreatment subsystems . These product portfolios include: inductive angle sensor interfaces, pressure sensor interfaces, knock and wheel speed detection circuits, oil / urea flow (urea-flow) and airflow interfaces, in-vehicle network components, throttle actuator drivers and pre-drivers, electromagnetic And piezoelectric fuel injection system, spark ignition, fan, pump and hydraulic control. 6 is a block diagram of a gasoline engine management system. In addition, ON Semiconductor also provides a diesel engine management system to meet the increasing demand for diesel engines in Europe and North America.
2. Fuel injection system solution
The fuel injection system is used to measure the fuel quantity and timing of each cylinder. The fully integrated multi-point (MPI) gasoline engine management system is still the most popular solution. In order to meet the new demand of the strong growth of gasoline direct injection (GDI) system, ON Semiconductor also launched a powertrain solution, covering transmission control and position detection, engine control, throttle control, oil level sensor, air flow monitoring, valve Control, fuel injection control and other applications.
Semiconductor devices help improve efficiency through engine control, inspection, and driving. Carefully controlled key components such as fuel injectors and valves can achieve maximum efficiency. In order to improve the control ability, the pressure of the combustion chamber needs to be measured and processed in real time, which can reduce the fuel consumption of the gasoline engine by 30%.
to sum up
In addition to being used in body and power systems, ON Semiconductor ’s various automotive applications using advanced automotive process technology can also be used in other parts of automotive electronics to achieve excellent performance. These devices include: system-on-chips that integrate key system components to improve system reliability, reduce energy consumption, and save board space; linear regulators with extremely low quiescent current and wide linear voltage regulation capability have short-circuit protection and over-temperature protection ; Integrated circuits that use self-protecting MOSFETs can replace relays and fuses to drive electromagnetic coils and lamps; high-voltage rectifiers that eliminate reverse recovery oscillations can provide low forward voltage drop and improve efficiency; high-reliability electronic modules with transient voltage protection Realize the protection of I / O and sensors, load dump, network data lines and load switches. In addition, ON Semiconductor also provides a variety of automotive-grade operational amplifiers and comparators, reliable motor and electromechanical relay drive integrated circuits and sockets, and a robust standard logic series using standard CMOS / low-voltage CMOS processes. All these integrated circuits and discrete devices are in compliance with automotive reliability and temperature specifications and environmental protection requirements, and can meet people's increasingly higher requirements for automotive comfort and other aspects.
In situations which require the use of high powered LEDs and/or a greater number of LEDs in series, a high Power Led Driver is an appropriate addition to the circuit. Care must be used not to overpower the circuit, as this can result in a number of burnt out lights. Applications which commonly require the use of a high power LED driver include:
- Automotive applications such as exterior LED lights (brake lights, tail lights, etc), display panel usage, interior vehicle lights, etc.
- Hotels, stores, restaurants, bars and more where a particular mood is desirable.
- Emergency lights, flashlights, landscape lighting, underwater lighting, lanterns and more.
- LED lights used in indoor plant growth facilities.
High Power Led Driver
Constant Current High Power Driver,High-Power Leds Driver,Power Led Driver
ShenZhen Fahold Electronic Limited , https://www.fahold.com