Power Conversion Apparatus Capacitor Voltage Timing Control
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Solution Overview
Problem
Existing power conversion systems face challenges in minimizing overcurrent occurrences between power converters and capacitors, leading to potential degradation and reduced operation rates, especially when dealing with residual voltages and varying capacitance levels.
Innovation Solution
A power conversion apparatus with control circuitry that determines the optimal timing for applying AC voltage to a capacitor based on the capacitor voltage, eliminating or minimizing overcurrents by synchronizing with the system voltage and eliminating the need for discharge circuits, thus allowing for quicker startup and reduced size requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If AC voltage is applied to the capacitor without timing control, then the power conversion apparatus can start quickly, but overcurrent occurs causing component degradation and reduced reliability
Solution Approach 1:
The control circuitry performs preliminary detection of capacitor voltage before applying AC voltage. By checking whether the capacitor voltage is within a predetermined range before startup, the system prepares the optimal timing for voltage application, preventing overcurrent while enabling quick startup without requiring discharge circuits.
2Reliability
If discharge circuits are added to prevent overcurrent, then component reliability improves, but device complexity and size increase
Solution Approach 1:
The invention extracts and eliminates the unnecessary discharge circuit from the system. By using timing control based on capacitor voltage detection, the harmful function of the discharge circuit (which only delays startup without preventing overcurrent) is removed, simplifying the device while maintaining reliability.
Solution Approach 2:
The control circuitry uses the capacitor's own voltage information to determine the optimal timing for AC voltage application. This self-service approach eliminates the need for external discharge circuits, as the system uses its own state information to control the startup process safely.
3Reliability
If discharge circuits are included to prevent overcurrent, then component degradation is reduced, but the overall apparatus size increases
Solution Approach 1:
The invention removes the discharge circuit from the apparatus, reducing overall volume. By using timing control based on capacitor voltage detection, the system achieves component protection without the space-consuming discharge circuit hardware.
4Productivity
If AC voltage is applied immediately regardless of capacitor voltage, then startup speed increases, but overcurrent occurs causing operation interruptions
Solution Approach 1:
The control circuitry performs preliminary voltage detection before startup to determine the optimal timing for AC voltage application. This preliminary action ensures that voltage is applied when capacitor voltage is within the predetermined range, preventing overcurrent while maintaining fast startup and continuous operation.
Solution Approach 2:
The control circuitry continuously monitors capacitor voltage and uses this feedback information to determine the precise timing for AC voltage application. This feedback mechanism ensures startup occurs at the optimal moment, preventing overcurrent while maintaining high productivity and operation continuity.
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 minimizes overcurrents and degradation of components, ensures quick restarts, and reduces the size of the power conversion apparatus by eliminating the need for discharge circuits, while maintaining efficient power generation and system interconnection.
Implementation Method 1
a voltage across a capacitor disposed between the power system and the power conversion circuitry
Data Source
AI summary
A power conversion apparatus includes power conversion circuitry that converts first power supplied from a power source into AC power corresponding to second power of a power system, and control circuitry that instructs, at a time that is determined based on a voltage across a capacitor disposed between the power system and the power conversion circuitry, the power conversion circuitry to start applying an AC voltage to the capacitor.