Switching amplifier circuitry
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Solution Overview
Problem
Switching amplifier circuitry for inductive loads faces a trade-off between reducing capacitive and resistive losses and increasing ripple current losses, necessitating an optimal switching frequency that balances these factors for minimized power consumption.
Innovation Solution
The circuitry adjusts its switching frequency over a predetermined range, monitoring power consumption to select an operational frequency where input power is minimized, using modulator and output stage circuitry with input power monitoring, and optionally employing Class AD or Class BD modes and pilot signals to generate ripple current for optimization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the switching frequency is adjusted to optimize power consumption, then overall power usage is reduced, but the system complexity increases due to monitoring and selection circuitry
Solution Approach 1:
The patent applies universality by designing the frequency selection circuitry to perform multiple functions: it monitors power consumption, evaluates different switching frequencies, and selects the optimal frequency. This multi-functional approach reduces the need for separate dedicated circuits for each function, thereby minimizing the increase in system complexity.
Solution Approach 2:
The system applies self-service through automatic frequency selection based on monitored power consumption. The amplifier circuitry autonomously determines and adjusts its optimal switching frequency without external intervention, eliminating the need for manual tuning or complex external control systems.
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
This approach identifies an operational switching frequency that optimizes power consumption by balancing capacitive and ripple current losses, reducing overall power usage effectively.
Implementation Method 1
relying on the inductance of the load to filter out the switching frequency signal components
Implementation Method 2
the energy lost per unit time in an output stage driver of the amplifier circuitry, and/or in a gate capacitance of transistor
Implementation Method 3
resistive power losses in the output stage transistor caused by the load current
Data Source
AI summary
Switching amplifier circuitry for driving an inductive load, the switching amplifier circuitry comprising modulator circuitry and output stage circuitry, wherein the switching amplifier circuitry is configured to: while the modulator circuitry is outputting a modulated output signal that gives rise to ripple current in the load: adjust a switching frequency of the modulator circuitry over a predetermined range of frequencies; monitor a power of the switching amplifier circuitry as the switching frequency is adjusted over the predetermined range of frequencies; and select, as an operational switching frequency for the modulator circuitry, a frequency within the predetermined range of frequencies at which the monitored power meets a predefined criterion.