A control system dedicated to an implantable heart failure electromechanical system

Abstract

The invention discloses a control system special for an implantable cardiac function failure electromechanical system. The control system comprises a position detection circuit, a control circuit, a power driving circuit, a power supply, a protective alarm circuit, a key display circuit, a communication circuit and an upper computer; the control circuit outputs six routes of PWM control signals to the power driving circuit which outputs three routes of driving signals to a motor according to the six routes of PWM control signals; the motor is a disc non-position sensor brushless direct current motor; the position detection circuit outputs three routes of zero passage signals by detecting the three routes of driving signals; the three routes of zero passage signals are input into the control circuit; the control circuit determines the six routes of PWM control signals according to the three routes of zero passage signals; the power driving circuit uses a double-route full-bridge driver. The control system is used for controlling the disc non-position sensor brushless direct current motor, has few peripheral devices, and is low in power consumption, high in reliability and small in size.

Description

technical field [0001] The invention relates to a control system specially used for an implantable heart failure electromechanical system. Background technique [0002] A better way to treat heart failure is a heart transplant. According to the statistics of the United States, as many as 50,000 patients need heart transplantation each year, but only 2,000 heart donors can be provided clinically. Therefore, the long-term implantable heart failure electromechanical system (left ventricular assist device) has become an urgently needed alternative device for heart failure patients. [0003] Whether the left ventricular assist device can meet the physiological needs of the recipient depends mainly on the control system of the pump, such as energy supply and control strategy, in addition to the structural parameters of the pump body. Among them, the control strategy is the key technology, because it involves the feedback signal driven by the blood pump motor, whether a sensor is...

AI Technical Summary

Problems solved by technology

When controlling brushless DC motors, Hall elements are often used to detect position signals for control. After the position sensor is installed, the volume of the motor will increase, the cost will increase, and there will be too many connections. The increase of armature current and the reduction of motor efficiency will increase the heat generation of the motor, and the requirements for the manufacturing process of the motor are high.

Images