Design of an H-bridge driver without dead-time generation using gate bias

Abstract

H-bridges are important driving components for consumer electronics and industry controls. They also play an important role in technologies related to DC motor control. Conventional Hbridge drivers require dead-time generation to avoid the shootthrough current resulting from both upper and lower power transistors being turned on concurrently. Unlike the conventional H-bridge driver, this paper proposes an H-bridge driver based on a complementary MOSFET type using gate bias, without a dead time generator, to improve its driving efficiency. Moreover, this proposed H-bridge driver also has a reduced hardware complexity.

A dead-time generator based on OPA slew rate for consumer electronic applications

“…Fig. 2 illustrates the existence of dead time corresponding to the input PWM signal [2]. The dead time can prevent the upper and lower transistors on the same side from turning on concurrently, such that these transistors are not damaged by the shoot-through current.…”

“…It only requires an OPA voltage follower to generate a delay PWM output (V SR ) by the slew rate, and two comparators are used to determine two gate voltages (V GP and V GN ) with dead time for NMOS and PMOS, respectively. T T T T T T T T (1) 2 2 2 2 D SR PWM D SR D PWM WN T T T T T T T T (2) where T PWM is the ON time of PWM signal, T SR is the delay time caused by the voltage follower with slew rate, and T D1 and T D2 are reduced time caused by two comparators, respectively. T T T T T T (3)…”

Design of Charge Pump Circuit for Stepper Motor Drive Chip

“…By controlling the electrification time sequence of the coil, the magnets generate an interacting force to rotate. The h-bridge drive circuit is a typical DC motor control circuit, through the control of the switch to drive the DC motor and other functions [2][3] . Switching devices generally choose high-power MOS tubes.…”