A motor drive circuit with asymmetric drive and feedback current and its application

Abstract

The invention provides a novel driving and feedback current asymmetric motor driving circuit and an application. The motor driving circuit comprises a driving circuit and a brake energy recycling and feedback circuit; the driving circuit is a bridge type topological circuit which consists of multiple power devices and has an inversion function; under control of the control circuit, direct current electric energy is converted into electric energy required for driving a motor; the input end of the control circuit is connected with a power supply while the output end is connected with the motor; the brake energy recycling and feedback circuit is a bridge type rectifying circuit with a control function and a one-way switch-on function, and can recycle the electric energy generated by braking of the motor to an energy storage element or other circuit and apparatus capable of consuming electric energy; and the input end of the brake energy recycling and feedback circuit is connected with the motor while the output end is connected with the energy storage element or other circuit and apparatus capable of consuming electric energy. The novel driving and feedback current asymmetric motor driving circuit can be applied to a dual-source motor driving system or a common non-dual-source motor driving system; and the rectifying circuit can use the power devices with relatively low cost, so that the vehicle cost can be lowered.

Description

technical field [0001] The invention relates to a motor drive circuit with asymmetric drive and feedback currents, in particular to a drive circuit used in a drive system composed of a secondary power supply (a power supply that can be repeatedly charged and discharged) and a motor. Background technique [0002] In order to solve the energy crisis and environmental pollution caused by traditional internal combustion engine vehicles, all countries are striving to develop new energy vehicles with secondary power and motor drive systems. [0003] At this stage, power devices (such as IGBT or MOSFET are commonly used in vehicles with secondary power supply and motor drive system. IGBT: the English initials of insulated gate bipolar transistor, Insulated Gate Bipolar Transistor; MOSFET: metal-oxide The English acronym for Semiconductor Field Effect Transistor, Metal-Oxide-Semiconductor Field-Effect Transistor) is used as a power switch tube to realize the mutual conversion betwee...

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Problems solved by technology

The main characteristic parameter of energy conversion is the magnitude of the current, but when the vehicle motor is in the braking energy recovery state, the current passing through the power device is much larger than the current passing through the power device when the vehicle motor is in the driving state , if the braking energy recovery rate is high, it is necessary to use a large-capacity power device, and the cost price of the power device increases exponentially with the increase in capacity, and then increases the vehicle cost, otherwise the braking energy recovery rate will be relatively low. Small

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