Patent ID: 7626452

Claim:
A soft switching DC motor driver to avoid reverse current comprising: a power supply for generating an input voltage; an input capacitor coupled to the power supply; a Hall sensor having a first output end for generating a first timing control signal, and a second output end for generating a second timing control signal; a first amplifier having a first input end coupled to the first output end of the Hall sensor, a second input end coupled to the second output end of the Hall sensor, a first output end, and a second output end, the first amplifier being utilized for amplifying the first input signal and the second input signal of the first amplifier; a second amplifier having a first input end coupled to the second output end of the Hall sensor, a second input end coupled to the first output end of the hall sensor, a first output end, and a second output end, the second amplifier being utilized for amplifying the first input signal and the second input signal of the second amplifier; a full-bridge driver circuit having an input end coupled to the power supply and the input capacitor, a first control terminal coupled to the first output end of the first amplifier, a second control terminal coupled to the second output end of the first amplifier, a third control terminal coupled to the first output end of the second amplifier, a fourth control terminal coupled to the second output end of the second amplifier, a first output end for generating a first output voltage, and a second output end for generating a second output voltage; and a first operational amplifier having a first input end for receiving a first reference voltage, a second input end coupled to the first output end of the full-bridge driver circuit, and an output end coupled to a control terminal of the first amplifier, the first operational amplifier for controlling output voltages of the first amplifier.