Winding Parameter Calculator Using Impulse Voltage Regression
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Solution Overview
Problem
Conventional impulse winding testing instruments cannot individually calculate the inductance, capacitance, and resistance values of windings, leading to difficulties in comparing LC or RC values between multiple windings and analyzing temporal variations, and require longer measurement times due to the use of back flow preventing diodes that separate the internal and tested circuits.
Innovation Solution
A testing instrument with external terminals, an impulse voltage application capacitor, a switch, a current limiting resistor, and a parameter calculator that performs regression analysis on measured voltage values to calculate equivalent inductor, capacitor, and resistor values, allowing for shorter analysis times and easier characterization of windings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional impulse winding testing instruments use back flow preventing diodes to separate internal and tested circuits, then circuit protection is improved, but measurement time increases
Solution Approach 1:
The patent extracts the back flow preventing diode from the circuit configuration. By removing this component that caused circuit separation and extended measurement time, the invention achieves continuous measurement without waiting for resonance phenomena, thus reducing measurement time while maintaining circuit protection through alternative means
Solution Approach 2:
The patent applies preliminary action by performing parameter calculations during the impulse voltage application phase itself, rather than waiting for the resonance phase after circuit separation. The parameter calculator computes inductance, capacitance, and resistance values from voltage measurements taken during the impulse phase, eliminating the need to wait for resonance measurement
2Device complexity
If conventional instruments calculate only multiplied values (LC and RC), then calculation complexity is reduced, but analysis capability deteriorates
Solution Approach 1:
The patent segments the calculation process into distinct phases: first calculating capacitance from the initial voltage response, then using that capacitance value to calculate inductance and resistance from subsequent voltage measurements. This segmentation allows individual parameter identification while maintaining manageable calculation complexity through step-by-step computation
Solution Approach 2:
The patent employs feedback by using the calculated capacitance value as input for subsequent inductance and resistance calculations. The parameter calculator continuously refines parameter estimates based on measured voltage data and previously calculated parameters, enabling accurate individual parameter identification through iterative computation
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
Enables faster and more straightforward analysis of winding characteristics by individually calculating inductor, capacitor, and resistor values, reducing measurement time and improving analysis efficiency.
Implementation Method 1
an impulse voltage application capacitor having one end connected to the second external terminal; a switch connected between another end of the impulse voltage application capacitor and the first external terminal
Implementation Method 2
a voltage measurement circuit configured to measure a voltage between the first external terminal and the second external terminal
Implementation Method 3
a parameter calculator configured to calculate at least one of a value of an equivalent inductor connected between the first external terminal and the second external terminal, a value of an equivalent capacitor connected between the first external terminal and the second external terminal, and a value of an equivalent resistor connected between the first external terminal and the second external terminal in series with the equivalent inductor, based on the measured value information stored in the memory
Data Source
AI summary
The characteristics of a winding to be tested is allowed to be analyzed more easily and in a shorter time. A testing instrument 1 includes an impulse voltage application capacitor Cs having one end connected to an external terminal T2, a switch SW and a current limiting resistor Rs connected in series between another end of the impulse voltage application capacitor Cs and an external terminal T1, and a parameter calculator 5. The parameter calculator 5 calculates at least one of the value of the equivalent capacitor Cd, the value of the equivalent inductor Ld and the value of the equivalent resistor Rd by performing regression analysis using a measured value of a voltage Vcd in an analysis time period Ta from turning on of the switch SW to start of resonance based on the equivalent inductor Ld, the equivalent capacitor Cd and the equivalent resistor Rd pertaining to a winding 11.