Drive circuit capable of controlling torque of motor

• Main Authors: ANDY.CAVES, ZHANG XINGWANG, SUN XINHUI, XIAO LIN, CHEN HUASHENG
• Format: Patent
• Language: Chinese; English
• Published: 23.01.2013
• Subjects: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION

The utility model relates to a motor drive circuit, in particular to a drive circuit capable of controlling the torque of a motor. The drive circuit comprises a bridge drive circuit, wherein the output end of the bridge drive circuit is connected with a current detecting resistor; the current detecting resistor is connected with a voltage comparison circuit; the output end of the voltage comparison circuit is connected with the comparison input end of a first comparator; the reference input end of the first comparator is connected with a reference voltage setting circuit; and the output end of the first comparator is connected with the input end of the bridge drive circuit. By adopting the above structure, a reference level can not only be fixed, but also be regulated as required by using the comparator, the voltage samples which are obtained from the current detecting resistor are used for performing voltage comparison, and an output sub-controlling low-side switch of the comparator is used for controlling t