H-bridge Drive Circuit Design

The emerging of smart power integrated circuit (SPIC) is important to increase the system's reliability and reduce cost, weight and volume. It has great meaning to the design and production of even more miniaturized and intellectualized systems for different applications in the field of automobile, industry and telecommunication. In this thesis, an H-Bridge power drive integrated circuit has been analyzed, designed and taped-out. It is a typical SPIC, which could be widely used in stepper motor drive, position and velocity servomechanism, industrial automaton, various numerical controlled equipments, printers and plotters control and other applications. This device is built on a multi-technology process named BCD (Bipolar, CMOS, and DMOS), operates from 10V to 60V, based on PWM control, and it has current sense circuitry, over-current and under-voltage protection, thermal warning and thermal shutdown.During the circuit design, the author analyzed the basic principle of the direct current motor, PWM control, H-Bridge power driver, and two control techniques of H-Bridge power drive circuit, designed its general structure, so the feasibility of the design is confirmed. Then, reference, oscillator, power DMOS gate drive circuit (charge pump, bootstrap), and dead time generation circuit are designed and analyzed in the sub-circuits.A current-controlled oscillator is presented in this thesis. In this circuit, reference current sources are used to charge and discharge capacitors. This oscillator's output is very ideal through control circuit under 5.7V reference voltage, and oscillator's frequency and duty-cycle could be adjusted if reference current source or capacitors in the circuit was adjusted. And the changes of temperature and voltage affect stabilize of the frequency little.Then, using the EDA software, the simulations of whole and sub-circuits on the basis of existed models are carried out to verify the whole design process.After completing the whole circuit simulation and layout, typical performance characteristics simulation and analysis, we taped-out the chip successfully and completed part of the IC test. The test results proved the function of the chip.