Redundant Power Amplifier Supply With Selective Stage Shutdown
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Solution Overview
Problem
High-frequency power amplifiers face operational challenges due to the high risk of failure in power supply units, leading to reduced output power and increased costs, as existing redundant power supply systems require oversized power supplies and complex switching mechanisms, making them expensive and impractical for uniform housing designs.
Innovation Solution
A circuit arrangement where power packs are interconnected at their load-side connections, allowing for immediate switching off of failed output stage parts, using a common filter and status lines to manage power distribution, enabling continued operation with reduced power without the need for oversized power supplies, and utilizing a logic unit to control switching elements for efficient redundancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power supply units are oversized to ensure redundancy, then operational reliability is improved, but device cost and size increase significantly
Solution Approach 1:
The power amplifier is divided into multiple independent output stage amplifiers (first, second, third, fourth) that can be independently controlled. Each amplifier has its own power consumption characteristics, allowing the system to segment the total power load and switch off individual segments rather than requiring the entire power supply to be oversized for full redundancy.
Solution Approach 2:
The system dynamically switches between different operating modes based on failure conditions. In normal operation, all output stage amplifiers are active. Upon detecting a power supply failure, the control unit dynamically reconfigures the system by switching off specific amplifiers to match the reduced power availability, allowing the power supply units to be sized for normal operation rather than worst-case redundancy scenarios.
2Reliability
If switches are used to disconnect failed power supplies, then reliability is improved, but the switches must handle high short-circuit currents increasing their size and cost
Solution Approach 1:
The invention extracts the switching function from the power supply connection point and relocates it to the output stage amplifier level. Instead of switching off the entire power supply and its high-current connections, the system keeps power supplies connected but switches off individual output stage amplifiers using low-current control signals, thereby removing the requirement for high-current switching capability.
Solution Approach 2:
The control unit acts as an intermediary between the power supply failure detection and the output stage amplifier switching. It receives failure signals, processes the information, and generates appropriate control signals to switch off specific amplifiers, thereby mediating the transition from power supply failure to selective amplifier shutdown without requiring direct high-current switching.
3Reliability
If all power supplies remain connected during failure, then power availability is maintained, but current sensors report errors due to imbalanced power distribution
Solution Approach 1:
The system uses current sensors to continuously monitor power distribution and provides feedback to the control unit. When a power supply failure is detected, the control unit uses this feedback information to calculate which output stage amplifiers should be switched off to balance the power distribution, ensuring that current sensor readings remain within valid ranges and do not trigger false error conditions.
Data Source
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AI summary
The invention relates to a circuit arrangement for the redundant current supply of a power amplifier (1), in particular a high frequency power amplifier. Said power amplifier (1) comprises several end stage parts (21) and several network parts (2). The network parts (2) are interconnected to the load-sided connections and supply the end stage parts (21) together with energy. If a network part (2) breaks down, at least two end stage parts (21) are actively switched off in such a manner that the power amplifier (1) can continue to operate even with reduced output power.