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Capacitive Discharge Initiator (CDI)

Invocon’s Capacitive Discharge Initiator (CDI) Module provides rocket/missile control and monitoring capabilities in a single compact unit, enabling safe operation and monitoring of ordnance. The CDI provides four fully redundant output channels, a single input trigger for starting the event timer, 1 ms timing resolution per channel, and four hours of run-time after input trigger. The CDI includes health and status monitoring for altitude switches, SAFE/ARM plug identification, and SAFE/ARM state, along with capacitor voltage monitoring and bad umbilical pull protection.

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Key Specifications

Specification
Value
Output Channels
4 fully redundant
Timing Resolution
1 ms per channel
Run-Time After Trigger
4 hours
Capacitor Voltage Monitoring
Yes
SAFE/ARM Monitoring
Plug identification and state identification
Altitude Switch Monitoring
Open/close monitoring
Battery Support
Smart primary and rechargeable batteries
Power Supply
Single or dual power supply source voltage

Key Features

  • Four Fully Redundant Output Channels

    Four redundant pyrotechnic output channels with 1 ms timing resolution for precise sequencing of ordnance events.

  • Health and Status Monitoring

    Monitors altitude switches, SAFE/ARM plug identification, and SAFE/ARM state, providing pre-fire system verification.

  • Capacitor Voltage Monitoring

    Continuously monitors CDI capacitor charge voltage to confirm sufficient energy for reliable squib firing.

  • Command Trigger Function

    Command trigger capability available on all channels enables ground or flight computer command-initiated event activation.

  • Bad Umbilical Pull Protection

    Protects against inadvertent initiation caused by accidental or premature umbilical pull during ground operations.

  • Smart Battery Support

    Supports both smart primary and rechargeable battery configurations, as well as standard vehicle power.

Typical Applications

  • Rocket Stage Separation

    Fires separation pyrotechnics on a programmable timeline to achieve precise stage separation timing.

  • Payload Deployment

    Commands pyrotechnic bolt cutters or deployment mechanisms for payload release.

  • Engine Ignition

    Provides reliable squib ignition for solid rocket motors and liquid engine igniters.

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