Integrated Circuit Leakage Current Cancellation
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Solution Overview
Problem
Existing power-factor correction circuits face increased manufacturing costs due to the need for auxiliary windings to cancel leakage currents, which cause ground voltage fluctuations.
Innovation Solution
An integrated circuit is designed to generate a compensation current to cancel leakage currents without the use of auxiliary windings, utilizing a drive circuit and compensation element to adjust the voltage phase opposite to the switching voltage, thereby reducing ground voltage fluctuations at a lower cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If auxiliary winding is provided to generate auxiliary current for canceling leakage current, then leakage current cancellation is achieved, but manufacturing cost increases
Solution Approach 1:
The patent combines the leakage current cancellation function with the existing drive circuit by adding a compensation element connected to the first terminal. The drive circuit simultaneously performs switching device control and generates compensation current through the compensation element, merging two functions into one circuit structure. This eliminates the need for separate auxiliary windings while maintaining leakage current cancellation capability.
Solution Approach 2:
The drive circuit is designed to generate its own compensation current internally using the compensation element connected to the first terminal. The circuit uses its own operating signals to create the compensation current that cancels leakage current, making the system self-sufficient without requiring external auxiliary windings or additional independent components.
2Stability of the object's composition
If auxiliary winding is used to generate compensation current, then ground voltage fluctuation is reduced, but device complexity increases
Solution Approach 1:
The patent merges the ground voltage stabilization function into the existing drive circuit by connecting the compensation element to the first terminal. The drive circuit simultaneously controls the switching device and generates compensation current to stabilize ground voltage, reducing the number of separate components and simplifying the overall circuit structure compared to auxiliary winding approaches.
3Reliability
If voltage phase adjustment is performed using drive circuit and compensation element, then leakage current is canceled, but circuit complexity increases
Solution Approach 1:
The drive circuit uses its own operating signals to automatically generate compensation current through the compensation element. The circuit leverages its inherent signal transitions to create the necessary compensation current without requiring additional control circuits or complex phase adjustment mechanisms, maintaining simplicity while achieving leakage current cancellation.
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 integrated circuit effectively cancels leakage currents, reducing ground voltage fluctuations and lowering manufacturing costs by eliminating the need for auxiliary windings.
Implementation Method 1
utilizing a drive circuit and compensation element to adjust the voltage phase opposite to the switching voltage
Data Source
AI summary
An integrated circuit that drives a switching device provided between a first line on a ground side and a second line on a power supply side, when a power supply voltage is applied between a first input terminal connected with a first capacitor and a second input terminal, the first capacitor having one end grounded and another end connected to the first input terminal, the integrated circuit includes: a first terminal connected to a circuit element, the circuit element having one end grounded and another end connected to the first terminal; and a drive circuit that changes a voltage at the first terminal to one logic level when a drive signal of the switching device changes to the one logic level, and changes the voltage at the first terminal to another logic level when the drive signal changes to the other logic level.