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Project Phantom heart pump

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Project Phantom heart pump

Rechten: Alle rechten voorbehouden

Samenvatting

The PHP project was commissioned by the radiology department of the UMCG. The main goal of the PHP is to research how diseased aortic valves affect blood flow. To research the effects a system is needed that mimics the behaviour of the heart. For this purpose the PHP will create the different heart rates and stroke volumes. These heart rates are created with a pump that needs to be controlled by electrical hardware and software, which is the main focus of this report. The main question that will be answered in this report is ‘How to realize the hardware and software needed to control the PHP’? To answer this question the choices and the requirements for the hardware and the software will be discussed.
Most of the mechanical parts of the PHP were already available. The only parts that remained were the electronic hardware and software. The hardware, in combination with the software, controls the entire system. At the heart is the microcontroller that controls and monitors the entire system by means of a motor driver and sensors. The motor driver is made up of two full H-bridges and a D-flip-flop circuit that controls the leads of the motor. There are two possibilities for the H-bridge; either a ready-made L6203 IC or a custom H-bridge using MOSFETs. Both options have certain advantages:
L6203 based H-bridge:
- Built-in enable
- Built-in shoot-through prevention
- One component for a full H-bridge
MOSFET based H-bridge:
- Current dependant on MOSFET type
- Voltage dependant on MOSFET type
- Heat dissipation dependant on MOSFET type
The D-flip-flop circuit is controlled by a clock signal that is generated by the microcontroller. The sensors are placed inside the system and monitor the pressure and the flow. The data of the sensors is used by the microcontroller for feedback. The parameters for the system are entered by the user via the user interface. The user interface allows the user to monitor the parameters and change them if necessary.
The hardware to control the linear actuator consists of two full H-bridges that are controlled by a dedicated counter made with a D-flip-flop. The full H-bridges are made with the L6203; a ready-made IC. To control the counter and other parts of the system an Atmel At32UC3C1512C microcontroller is used. The software inside the microcontroller controls the hardware and monitors the system with sensors for flow and pressure. The pressure sensor is controlled using the I2C protocol and the flow sensor gives of approximately 2100 pulses per litre.
The speed of the linear actuator determines the mimicked heart rate of the system. This heart rate also causes a pressure- and flow- profile of the fluid inside the system. These profiles are monitored with a differential pressure sensor and a flow sensor.
To control the system there is a user interface that is made up of buttons and a character display. The character display provides feedback to the user on the current parameters of the system or shows the current menu position where the user can change the parameters.

Toon meer
OrganisatieHanzehogeschool Groningen
OpleidingElektrotechniek
AfdelingInstituut voor Engineering
Jaar2012
TypeBachelorscriptie
TaalEngels

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