Power Circuit Signal Extraction via Current Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing power supply circuits for electric loads using inductive interfaces suffer from high power loss and mechanical sensitivity due to the use of high-impedance amplifiers and large choke coils, which degrade efficiency and are prone to damage during potting and thermal expansion.
Innovation Solution
A circuit design that extracts desired signals using a current corresponding to the carrier signal current flowing through a current path, eliminating the need for high-impedance amplifiers and choke coils by integrating impedance-increasing components outside the DC-AC converter, and using a current detection circuit between the direct voltage source and DC-AC converter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-impedance amplifiers and large choke coils are used to ensure sufficient voltage drop for signal detection, then signal extraction reliability is improved, but power loss increases and mechanical sensitivity worsens
Solution Approach 1:
The patent replaces the mechanical/voltage-based signal detection method with a current-based detection method. Instead of measuring voltage drop across the interface inductance (which required high-impedance amplifiers and choke coils), the invention measures the carrier signal current directly using a current detection circuit. This substitution eliminates the need for high-impedance components and large choke coils, thereby reducing power loss and improving mechanical reliability while maintaining signal extraction reliability.
2Reliability
If high-impedance amplifiers and large choke coils are used to ensure sufficient voltage drop for signal detection, then signal extraction reliability is improved, but mechanical sensitivity worsens
Solution Approach 1:
The patent replaces the voltage-based detection system with a current-based detection system. The current detection circuit measures the carrier signal current directly, eliminating the need for voltage amplification through high-impedance amplifiers and large choke coils. This removes the mechanical sensitivity issues associated with large choke coils that are prone to damage during potting and thermal expansion, while maintaining reliable signal extraction through current measurement.
3Ease of operation
If voltage-based signal extraction is used with interface inductance, then signal detection is possible, but power loss and component size increase
Solution Approach 1:
The patent substitutes the voltage-based signal extraction method with a current-based method. The current detection circuit directly measures the carrier signal current, eliminating the need for interface inductance-based voltage measurement and the associated high-impedance amplifiers and large choke coils. This reduces device complexity and component size while maintaining signal detection capability through direct current measurement.
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 design reduces power loss, increases efficiency, and allows the circuit to be used in potting compounds without mechanical damage, as it relies on lower impedance components and eliminates the need for choke coils.
Implementation Method 1
The interface 3 is designed as an inductive interface 3 that enables a wireless transfer of power and desired signals. This comprises a circuit-side inductance L1, connected to the circuit 1, that forms a transmitter together with an electric load-side inductance L2 connected to the electric load 5.
Implementation Method 2
The electric load 5 comprises an element 9 to be supplied with power via the interface 3 for example, the sensor S connected via a rectifier 11 to the two terminals of the electric load-side inductance L1. Moreover, the electric load 3 comprises a modulator 13 for modulating the amplitude of the carrier signal transmitted via the interface 3.
Data Source
AI summary
Described is a circuit for supplying power to an electric load connected to the circuit via an interface, and for receiving desired signals transmitted from the electric load by an amplitude modulation, performed by the electric load, of a carrier signal transmitted from the circuit via the interface, said carrier signal serving to supply power to the electric load, with a carrier signal generator that comprises a direct voltage source and a DC-AC converter downstream of the direct voltage source, and with a demodulator for extraction of desired signals modulated by the electric load on the carrier signal, which circuit has a high efficiency without the use of choke coils. The demodulator is designed to extract the desired signals using a current corresponding to a carrier signal current flowing through a current path of the circuit during a transmission of the desired signals, said carrier signal current flowing across the interface.