MOSFET Gun Control Unit for M134 Minigun Heat Reduction
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Solution Overview
Problem
Existing gun control units for M134 miniguns rely on two relays, leading to high heat dissipation and reduced magnetic field strength due to continuous voltage and maximum current consumption, which is inefficient and less reliable compared to solid-state technology.
Innovation Solution
A solid-state metal-oxide-semiconductor field-effect transistor (MOSFET) processor-enabled gun control unit (GCU) that independently controls the armature and stator using pulse width modulation (PWM) and incorporates feedback sensors for closed-loop control, reducing heat dissipation and improving reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two relays are used to control the armature and stator, then the control function is achieved, but high heat dissipation occurs and reliability is reduced
Solution Approach 1:
The patent replaces the mechanical relay-based control system with a solid-state electronic control system using MOSFETs. This substitution eliminates the mechanical contacts and coil structures of relays, thereby reducing heat dissipation and improving reliability. The MOSFET-based half-bridge configuration provides more efficient power switching with lower on-resistance and reduced power losses compared to relay contacts.
Solution Approach 2:
The patent changes the control parameters from continuous voltage through relays to pulse-width modulation (PWM) through MOSFETs. This parameter change allows for variable duty cycle control, enabling the system to reduce average power consumption and heat dissipation while maintaining effective control of the armature and stator. The PWM technique modulates the voltage duty cycle to achieve precise control with reduced thermal effects.
2Reliability
If continuous voltage and maximum current are supplied, then the motor operates reliably, but heat dissipation increases and energy efficiency decreases
Solution Approach 1:
The patent implements periodic action through PWM control, where voltage is applied in pulsed rather than continuous manner. The MOSFETs switch the power supply to the armature and stator in periodic pulses with variable duty cycles. This periodic application of voltage maintains motor operation reliability through sufficient average power delivery while reducing instantaneous peak currents and overall heat dissipation compared to continuous maximum voltage supply.
Solution Approach 2:
The patent introduces dynamic control capability through the MOSFET-based PWM system, allowing the duty cycle to be adjusted in real-time based on operational requirements. This dynamic adjustment enables the system to optimize the balance between power delivery for reliable operation and power reduction for heat management, unlike the static on/off control of relays.
3Strength
If relays are used for control, then the structure is simple, but magnetic field strength is reduced and control precision is limited
Solution Approach 1:
The patent replaces the mechanical relay system with solid-state MOSFETs, which have lower on-resistance and can handle current more efficiently. This substitution reduces power losses in the control circuitry, allowing more power to be delivered to the stator and armature, thereby improving magnetic field strength. The solid-state switches also provide faster switching speeds and better control precision compared to mechanical relays.
4Temperature
If PWM control is implemented, then heat dissipation is reduced, but control system complexity increases
Solution Approach 1:
The patent merges the control functions into an integrated MOSFET-based half-bridge configuration that combines power switching and PWM control in a unified circuit architecture. This integration reduces the need for separate control components and wiring, thereby managing the complexity increase that comes with PWM implementation. The half-bridge topology efficiently combines the power handling capability with the PWM control signal generation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The MOSFET processor-enabled GCU reduces heat dissipation and maintains control over the M134 minigun's motor speed and magnetic field strength, enhancing the firearm's performance and reliability by using solid-state technology and feedback sensors.
Implementation Method 1
The microprocessor sends signals in a pulse width modulation (PWM) format. The duty cycle is used to control the amount of DC voltage delivered to the motor, and this controls its speed.
Implementation Method 2
PWM is also used on the stator and a solenoid (used as a clutch), as the duty cycle is decreased on those, the heat that is being dissipated can be reduced
Implementation Method 3
The GCU includes a microprocessor that controls the speed of a motor by using solid state technology that includes the MOSFET(s) and drivers. The MOSFET(s) are used in a half-bridge configuration
Implementation Method 4
incorporates feedback sensors as part of a closed loop control system. the one or more software modules are configured to, when executed by the at least one hardware processor, receive one or more feedback signals from the one or more feedback sensors and provide closed loop control
Implementation Method 5
controls an armature (or rotor assembly) and a stator (used to generate a magnetic field) of a M134 minigun firearm independently
Data Source
AI summary
A gun control unit for a M134 minigun firearm including an armature and a stator comprising at least one hardware processor; and one or more software modules that are configured to, when executed by the at least one hardware processor, independently control the armature; independently control the stator.