apa-1
^ Preliminary Construction of main assembly.^
^Battery Protection and Gas Gauge Assembly^
^2012^
2014
^2014^
APA-1
The APA-1 is an effort to make a multistage coilgun and experiment with a new charging, power source, switching, and control systems.
STATUS: Slow and Unsteady, but progress has been made.
A Working TO DO List.
Preliminary Design...Done (2012)
Primary Structure Fabrication and Assembly...Done (2013)
Capacitor Mount Assembly...Done (2013)
Projectile Magazine...Done (2013)
Injector Assembly...Done (2014)
Coil Mount Assembly...Done (2014)
Lithium Polymer Battery Protection and Balancing Circuitry...Done (2012)
Lithium Polymer Battery Charger Circuitry...Done (2013)
Lithium Polymer Fuel Gauge Circuitry...Done (2014)
Lithium Polymer Battery Assembly...Done (2012)
Low Voltage Power Supply Circuitry...Done (1.17.2015) (5V, 16.5V)
Infrared Projectile Sensor Arrays (2)...Done (2014)
Display Circuitry (10 LED Side Bar Graph and 3 Digit Rear Display)...Done (2014)
LED Flashlight and UV Laser Assembly...Done (2014)
Micro-controller Timing and Control Program... Done (1.03.2015)
Electromagnetic Stabilization Coils and Circuitry... Cancelled (Complexity and Size Restrictive) (2015)
Test Coils... Redesign In Progress (2015) ...
Discharge and Quench Circuitry...In Progress (Test Board Made) ...
Projectile Final Design... Redesign In Progress (2015) ...
High Voltage Capacitor Charger Circuitry... Done (2015)
System Coil/Projectile/Timing/Quenching Optimization Testing...
Other Stuff...
STATS:
General:
Designation: APA-1
Name: Advanced Pulse Accelerator 1
Stages: 2 + Injector
Design Type: Handgun
Loading Type: Auto-loader Solenoid/Magazine
Switching Type: IGBT 4 x HGTG27N120BN
Clamp Diode: 2 x RHRG75120
Topography: Standard Dump and Quench
Trigger: Infra-Red Optologic Interrupt Sensors + Timing IGBT Driver
Charging: 6 Series Lithium Polymer Cells
Pack Nominal Voltage: 22.2V
Pack Rated Capacity: 800 mAh
Pack Rated Discharge Rate: 15 C ( 12 A )
Pack Nominal ESR Measured: ~330 mOhm
Charger Type: High Power Flyback Converter >70% Efficiency.
Coil Description:
Injector Coil Design:
Wire Size: 24 Gauge
Length: 22.2 mm (0.875 in)
Layers: 20
Primary Accelerator Design:
Wire Size: 20 Gauge
Length: 22.2 mm (0.875 in)
Layers: 6-12
Encased in Slotted Low Carbon Steel A513
Secondary Accelerator Design:
Wire Size: 20 Gauge
Length: 31.75 mm ( +-1 mm) (1.25 in)
Layers: 6-12
Encased in Slotted Low Carbon Steel A513
Capacitors:
Injector Coil-
Capacitance: 47-94 uF
Voltage: 400 VDC ( To 450 V)
Primary Accelerator-
Capacitance: 1120 uF
Voltage: 400 VDC ( To 450 V)
ESR: 178 mOhm
Secondary Accelerator-
Capacitance: 1120 uF
Voltage: 400 VDC ( To 450 V)
ESR: 178 mOhm
Projectile:
Projectile Material: Low Carbon Steel 1006 + Nylon Sleeve
Diameter: 12.7 mm (1/2 in)
Length: 31.75 mm ( +-1 mm) (1.25 in)
Armature: 15.9 mm (+-1 mm) (0.625 in)
Stabilization Structure: 15.9 mm (+-1 mm) (0.625 in)
Mass: 15 g (+-1 g)
Theoretical Measured:
Exit Velocity: ~40 m/s
Load Time: ~2s (Fully Charged Batteries)
Theoretical Calculated:
Accelerator Stored Energy: 227 J
Kinetic Energy: ~11 J
Weapon Efficiency: >5.0 % (GOAL)
Momentum: ---- kg*m/s
Charger Power (New Batteries): > 115 W
Details:
Battery Protection: DS2726
Battery Charging: BQ2954
Battery Fuel Gauge: BQ2050H
High Voltage Capacitor Charger: LT3751
Timing: PIC 12F509
IGBT Gate Driver: FAN3122T
IR Optical Sensor: QRD1114
Primary Display Driver: LM3914 and ICL7107 (MQFP)