Self-Bias Emitter Circuit Eliminates Auxiliary Power Supply
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Solution Overview
Problem
Existing parametric loudspeaker emitter configurations require an auxiliary power supply and additional wires for DC bias voltage application, increasing costs and complexity.
Innovation Solution
A self-bias emitter circuit that converts modulated or unmodulated AC carrier signals into a steady DC bias voltage using a transductor with an electromagnetic shielded pot core, full-wave bridge rectifier, filter capacitors, and optional voltage doublers or center-tapped inductors, eliminating the need for auxiliary power supplies and external wires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an auxiliary power supply is used to provide DC bias voltage to the emitter, then the emitter can operate reliably, but the device complexity and cost increase due to additional wires and power supply components
Solution Approach 1:
The patent combines the DC bias voltage generation function with the existing AC carrier signal path by using a full-wave bridge rectifier and filter capacitor connected in parallel with the emitter. This merging eliminates the need for a separate auxiliary power supply while maintaining reliable DC bias voltage for emitter operation.
Solution Approach 2:
The AC carrier signal serves dual purposes: it provides the operating signal for the emitter and simultaneously serves as the input for generating the DC bias voltage through rectification and filtering. This multi-functionality eliminates the need for dedicated power supply wires and components.
2Reliability
If an auxiliary power supply with additional wires is connected to the emitter, then DC bias voltage can be provided, but the manufacturing cost increases
Solution Approach 1:
The patent merges the DC bias voltage provision function into the existing AC carrier signal circuitry by adding only a full-wave bridge rectifier and filter capacitor. This eliminates the need for separate power supply connections and reduces manufacturing costs associated with additional wires and auxiliary power supply components.
3Device complexity
If a full-wave bridge rectifier is used to convert AC carrier signal to DC bias voltage, then DC bias voltage can be generated without auxiliary power supply, but signal attenuation may occur
Solution Approach 1:
The patent segments the circuit into two independent parallel paths: one path maintains the original AC carrier signal connection to the emitter, while the other path uses a full-wave bridge rectifier and filter capacitor to generate DC bias voltage from the AC carrier signal. This segmentation ensures that the rectifier affects only the DC generation path and does not attenuate the AC carrier signal path.
Solution Approach 2:
The patent introduces a filter capacitor as an intermediary element between the full-wave bridge rectifier and the emitter. This capacitor smooths the rectified voltage to provide stable DC bias voltage while preventing signal degradation from affecting the AC carrier signal path.
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 self-bias emitter circuit provides a stable DC bias voltage without significant signal attenuation, reducing operational costs and simplifying the emitter system while eliminating the need for auxiliary power supplies and external wires.
Implementation Method 1
a full-wave bridge rectifier that can convert the modulated or unmodulated AC carrier signal into a corresponding DC voltage
Implementation Method 2
a filter capacitor can reduce variations of the DC voltage at the output of full-wave bridge rectifier in order to provide a steady DC bias voltage across the emitter
Implementation Method 3
a transductor with an electromagnetic shielded pot core, where a primary can be matched to the impedance of an amplifier, while a secondary is matched to the impedance of the emitter to provide a chosen resonant point
Data Source
AI summary
A emitter circuit for providing a bias voltage is disclosed. The emitter circuit can comprise an emitter. The emitter circuit can comprise a transductor that includes a primary winding and a secondary winding. The secondary winding can be operable to receive an alternating current (AC) carrier signal. The emitter circuit can comprise a voltage multiplier operable to receive the AC carrier signal from the secondary winding and generate a DC bias voltage. The emitter circuit can comprise a zener diode to limit an amplitude of the DC bias voltage applied across the emitter. The emitter circuit can comprise a filter capacitor operable to smooth the DC bias voltage applied across the emitter.