Bridge Pwm Driver Circuit Design

Smart Power Integrated Circuit (SPIC) enhances the power gain of integrated circuits by holding the power and information on a single chip. It embraces a wide spectrum of industrial contributions in the area of aeronautics and astronautics, military, automotive electronics, automation technologies, and consumer electronics. With the advances of the technology, SPIC will form the Power System on Chip (PSoC) together with other types of integrated circuits in a foreseeable future.The fullbridge Pulse Width Modulator (PWM) driver is a typical smart power integrated circuit design. Adopting BCD technology, it accepts an input voltage range up to 60V and gives a serial current output of 2A with an on resistor of 0.3Ω. It features in latch-up at low-voltage, protection against overvoltage, overheat and overcurrent, as well as current sensing. The driver can be massively brought into direct and stepper motor drive systems, position and speed servering systems, industrial robots, numerical control equipments, printers and graphic plotters.The general design of the circuits is based on the theories of operation and control of electrical machines. The functional modules and the functionality combination of them are defined for the fullbridge PWM driver. Emphasis of the process lies in the design of current sensing circuits, comparator circuits, protection circuits against overvoltage, and protection circuits against overcurrent. According to the general structure of the circuits and emulation of devices, simulations of the circuits and devices tolerance are carried out with electronic design automation (EDA) tools to verify the circuits design and ensure that the circuits meet the performance requirements.Normal voltage and current comparator circuits face unstable outputs due to the fact that comparator circuits are sensitive to noise. By applying positive feedback loop into the comparator circuits the transition is accelerated, meanwhile a hysteresis is generated accompanying the state changes to negative direction which significantly reduces the switch oscillation imposed by noise and such external factors. The simulations give evidence that comparator with hysteresis exceeds simple comparators by producing more stable and faster output voltage and current. The current sensing...