Transformer-Coupled Power Converter Control for Choke Ripple
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Solution Overview
Problem
Existing power converter apparatuses with choke coils experience significant ripple current issues due to inadequate control mechanisms, particularly when charging capacitive loads with low voltage.
Innovation Solution
A power converter apparatus with a transformer having magnetically coupled coil portions, a switching circuit, and a control unit that performs cyclical switching operations to manage the on-off states of switching elements, thereby controlling current flow through the choke coil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a third switching element and diode are added to create a period where current flows through the choke coil, then the continuous current rise problem is solved, but ripple current increases
Solution Approach 1:
The patent applies periodic action by implementing a cyclical control sequence that repeatedly switches the third switching element on and off during first and second operations. This periodic switching creates controlled current flow periods through the choke coil, preventing continuous current rise while the cyclical nature helps manage ripple current effects. The control unit cycles through first operation (third switching element on), second operation (third switching element off), and third operation, creating regular current patterns.
Solution Approach 2:
The patent applies preliminary action by proactively switching the third switching element on during first operations before the capacitive load voltage becomes critically low. This preliminary current flow through the choke coil prevents the condition where voltage drops too low and current would continuously rise, addressing the problem before it occurs by maintaining adequate current levels in advance.
2Use of energy by moving object
If the voltage of the capacitive load is small, then power conversion efficiency improves, but the current flowing through the choke coil continuously rises
Solution Approach 1:
The patent applies feedback by having the control unit monitor the voltage of the capacitive load and adjust the switching operations accordingly. When the capacitive load voltage becomes low, the control unit modifies the cyclical control sequence to prevent continuous current rise. This feedback mechanism allows the system to maintain efficient power conversion at low voltages while preventing unstable current conditions through real-time adjustments.
Solution Approach 2:
The patent applies dynamics by making the switching operations adaptive rather than fixed. The control unit dynamically adjusts the duty cycles and timing of the switching elements based on the capacitive load voltage conditions. This dynamic control allows the system to optimize power conversion efficiency at varying voltage levels while preventing the choke coil current from continuously rising by adjusting the switching pattern in response to changing conditions.
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 solution effectively suppresses ripple current in the choke coil, stabilizes current flow, and maintains current stability across varying load conditions.
Implementation Method 1
a transformer including a first coil portion, a second coil portion including a first winding and a second winding, and a center tap provided between the first winding and the second winding, wherein the first coil portion and the second coil portion are magnetically coupled
Data Source
AI summary
In a power converter apparatus, a control unit can perform cyclical control that cyclically repeats switching control that switches operations between a third operation, a first operation, the third operation, and a second operation in that order. The control unit performs at least first control, in which a third switching element is switched between off, on and off states in that order during each first operation in the above cyclical control, the third switching element is switched between the off, on and off states in that order during each second operation, and the third switching element is kept in the off state during each third operation.