H-bridge driving control circuit of motor

Abstract

The invention relates to an H-bridge driving control circuit of a motor, which comprises an H-bridge driving circuit, a driving control unit, an anti-interference unit and a protection unit, wherein in the H-bridge driving unit, two diagonal branch circuits are formed by four switching tubes; the driving control unit is used for converting an input control signal into a suitable voltage for controlling to switch on the corresponding switching tube; the anti-interference unit is used for preventing the upper arm switching tube of the other branch circuit from being switched on when one branch circuit is in the switch-on state; and the protection unit is used for preventing the lower arm switching tube of the other branch circuit from being switched on when one branch circuit is in the switch-on state. The H-bridge driving control circuit of the invention prevents the P switching tube which cannot be switched on from being switched on due to starting of the motor or burr generated by transient large current, improves the anti-interference capacity of the circuit, and can rapidly switch off the corresponding N-channel switching tube when the circuit control signal is disordered or goes wrong, so that the circuit has through protection function. The whole driving control circuit is driven by a single power supply, is easy to implement and has a simple structure, and the reliable work of the circuit is further guaranteed.

Description

technical field [0001] The invention relates to an H bridge drive control circuit of a motor. Background technique [0002] The power drive circuit of the motor is usually driven by an H-bridge structure. The H-bridge drive circuit is driven by four power switch MOS tubes. The upper arm is two P-channel MOS tubes, and the lower arm is two N-channel MOS tubes. Control the conduction and cut-off of the four switch tubes to make the motor rotate forward, reverse or stop. [0003] The patent application with application number 200820122809.1 and titled "H-bridge DC motor drive circuit" discloses an H-bridge DC motor drive circuit, which uses separate logic gates to control the H-bridge. The disadvantages of this circuit are: first, the ability to resist electromagnetic interference is weak; second, when the motor is started, it is easy to cause interference to the control signal, resulting in false conduction of the field effect tube; third, the logic gate circuit needs to prov...

AI Technical Summary

Problems solved by technology

The disadvantages of this circuit are: first, the ability to resist electromagnetic interference is weak; second, when the motor is started, it is easy to cause interference to the control signal, resulting in false conduction of the field effect tube; third, the logic gate circuit needs to provide external power supply The second power supply

However, the disadvantages of the H-bridge are: first, multiple control signals are required to control the working state of the H-bridge; signal interference

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