Parallel Wire Shunt Resistor for Inverter Surge Voltage Reduction
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Solution Overview
Problem
Inverter circuits face challenges in reducing surge voltage due to high wire inductance, which is not effectively addressed by existing current measuring devices using shunt resistors as current sensing elements.
Innovation Solution
The current measuring device employs two parallel wire members, one made of conductive metal and the other incorporating a resistive element metal, with an insulator in between, to reduce wire inductance and surge voltage by forming a current loop area reduction in the inverter circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a shunt resistor is used as a current sensing element in an inverter circuit, then current measurement function is achieved, but wire inductance increases causing high surge voltage
Solution Approach 1:
The patent combines the current sensing function and the surge voltage reduction function into a single integrated structure. The shunt resistor is constructed with parallel wire members that simultaneously serve as current sensing elements and inductance-reducing structures, eliminating the need for separate components and achieving both measurement precision and harmful factor reduction.
Solution Approach 2:
The patent changes the physical parameters of the wire structure by arranging multiple wire members in parallel with specific spacing and insulation. This configuration reduces the loop area and consequently reduces wire inductance, thereby reducing surge voltage while maintaining current measurement capability through the shunt resistor function.
2Object-affected harmful factors
If wire inductance is reduced to minimize surge voltage, then surge voltage decreases, but current measurement capability may be compromised
Solution Approach 1:
The wire members in the shunt resistor are designed to perform multiple functions simultaneously: they serve as current carrying conductors, current sensing elements through their resistance, and inductance-reducing structures through their parallel arrangement. This multi-functionality ensures that surge voltage reduction does not compromise current measurement capability.
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 configuration effectively reduces wire inductance and surge voltage in the power module by minimizing the area of the current loop, enhancing the design quality of inverter devices.
Implementation Method 1
the inductance of a wire when a shunt resistor is used as a current sensing element can be reduced
Implementation Method 2
the second wire member partially including a resistive element metal
Data Source
AI summary
Provided is a current measuring device including a first wire member formed of a conductive metal and a second wire member formed of a conductive metal, the second wire member partially including a resistive element metal, in which the first wire member and the second wire member are arranged in parallel with an insulator sandwiched therebetween in a portion where at least the resistive element metal is present.