Active Gated Shunt Filter for Low Frequency Emission Reduction
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Solution Overview
Problem
Existing electronic circuitry struggles to effectively filter very low-frequency electromagnetic emissions, particularly in radio systems, due to the weight and inefficiency of traditional inductor- and capacitor-based filters, which are unsuitable for applications where weight is a premium concern.
Innovation Solution
A power supply system with a controllable regulator and an active gated shunt filter that anticipates power demands by increasing or decreasing power input before and after transmission requirements, diverting excess power to a gated shunt regulator to reduce electromagnetic emissions, thereby smoothing out sudden power changes without the need for heavy energy storage components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional inductor- and capacitor-based filters are used to filter very low frequency electromagnetic emissions, then filtering effectiveness is improved, but weight increases significantly
Solution Approach 1:
The patent replaces the traditional mechanical/passive filter system (inductors and capacitors) with an active electronic control system consisting of a controllable regulator and gated shunt regulator. This substitution eliminates the need for heavy energy storage components while achieving the same filtering effect through electronic power management and controlled diversion of excess power.
Solution Approach 2:
The invention changes the operating parameters of the power supply system by dynamically adjusting the regulator's output based on predicted power requirements. By modifying when power is drawn (anticipating peaks and valleys) and controlling the diversion of excess power, the system achieves low-frequency emission reduction without requiring the physical parameters (large capacitors and inductors) of traditional filters.
2Object-affected harmful factors
If power is smoothed to reduce very low frequency electromagnetic emissions, then emission reduction is achieved, but radio pulse recognition may be compromised
Solution Approach 1:
The controllable regulator anticipates future power requirements by pre-drawing power before peak demand periods and storing it temporarily. This preliminary action smooths the power draw from the power supply while ensuring that full power is available when the radio actually transmits, thus maintaining pulse recognition integrity while reducing low-frequency emissions during non-transmission periods.
Solution Approach 2:
The gated shunt regulator acts as an intermediary that temporarily absorbs and diverts excess power that would otherwise create electromagnetic emissions. This intermediary component allows the system to decouple the smoothed power draw from the actual radio power requirements, ensuring that emission reduction does not compromise transmission integrity.
Data Source
AI summary
A power supply for a communications device, including a controllable regulator that varies power drawn from a power input according to communications requirements of the communications device. The controllable regulator increases power drawn from the power input immediately before an increase of power is required by the communications device when a magnitude of a rate of change of required power exceeds a predetermined level. An active filter is connected to an output of the controllable regulator. The active filter is controlled to variably divert power that is output from the controllable regulator in excess of what is required by the communications device, wherein electromagnetic emissions resulting from the rate of change of power are reduced.