^ 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)