Current Pulse Transformer for Isolated Signal Communication
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Solution Overview
Problem
Existing pulse transformer-based communication circuitry in SMPS applications faces challenges such as high power consumption, core magnetization losses, and cost considerations, particularly at low load conditions, due to the need for multiple turns and parasitic resistances, which limit efficiency and increase costs.
Innovation Solution
The use of a current pulse transformer with a single turn primary and secondary winding, operating in the current domain to transmit information, which reduces magnetizing inductance and loss resistance, allowing for low ohmic sensing and efficient communication across a mains isolation barrier, thereby minimizing power consumption and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If multiple turns are used in the transformer windings, then the magnetizing inductance is increased, but the power consumption and core losses increase significantly
Solution Approach 1:
The patent changes the operating domain from voltage to current, and reduces the number of turns from multiple to single turn. This parameter change fundamentally alters the transformer's magnetizing inductance requirements, allowing operation with minimal or zero magnetizing inductance, thereby eliminating the trade-off between inductance and power loss
Solution Approach 2:
Instead of using the conventional voltage-driven approach where high magnetizing inductance is required, the patent inverts the approach by using current-driven operation. This inversion allows the transformer to function effectively with single-turn windings and minimal magnetizing inductance, resolving the contradiction between maintaining reliable transformation and reducing power consumption
2Loss of energy
If single turn windings are used, then the loss resistance is reduced, but the manufacturing precision and winding complexity increase
Solution Approach 1:
The patent segments the transformer into single-turn primary and secondary windings, eliminating the need for multiple turns. This segmentation simplifies the winding process significantly, as single-turn windings are much easier to manufacture with consistent precision compared to multi-turn windings, thereby reducing both loss resistance and manufacturing complexity
Solution Approach 2:
The single-turn winding design uses simpler, less expensive winding materials and processes. The reduced complexity allows for easier manufacturing with standard tolerances, making the transformer more cost-effective and easier to produce at scale without requiring high-precision winding equipment
3Use of energy by moving object
If current domain operation is used, then power consumption is reduced, but the device complexity increases
Solution Approach 1:
The current pulse transformer serves multiple functions: it provides galvanic isolation, transforms current signals, and enables bidirectional communication across the isolation barrier. By integrating these functions into a single component, the patent reduces overall system complexity despite the specialized current-domain operation, as alternative implementations would require multiple separate components
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 enables accurate data communication with reduced power consumption and lower core losses, allowing for a smaller, more cost-effective transformer design that maintains efficient operation even at low load conditions, while preventing magnetization of the core and minimizing signal loss.
Implementation Method 1
a current pulse transformer including a primary winding, a core, and a secondary winding
Data Source
AI summary
A communication circuit for communication over a voltage isolation barrier, the communication circuit including a pulse driven transformer coupled to a current sensing input, wherein information is transferred in the current domain and wherein during the information transfer, the receiver input is made low ohmic, a current pulse transformer including a primary winding, a core, and a secondary winding, a resistor in parallel with the secondary winding, a current sensor having a low ohmic input to receive a pulse from the secondary winding, and a signal processing unit to extract information from the received pulse.