DC Power Supply Capacitor Switching for Lower Conduction Loss
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Solution Overview
Problem
Existing direct-current power supply devices experience conduction loss and inefficiency, particularly in light-load operations where high voltage output is unnecessary, leading to significant energy wastage due to conduction losses in backflow-preventing rectifying elements.
Innovation Solution
A direct-current power supply device is designed with a configuration that includes two capacitors connected in series between output terminals, a charging unit with switching elements, and backflow preventing elements, controlled by a unit that manages the charging and non-charging states of these components to minimize conduction losses by optimizing the switching and control of the backflow preventing elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If two switching elements are operated in light-load operation, then power factor is improved and harmonic components are reduced, but conduction loss increases due to current flowing through backflow-preventing rectifying elements
Solution Approach 1:
The invention dynamically switches between two operating modes: a first operation mode for light-load conditions where only one switching element operates, and a second operation mode for heavy-load conditions where two switching elements operate in synchronization with power supply half cycles. This dynamic adaptation resolves the contradiction by selecting the appropriate mode based on load conditions, minimizing conduction loss in light-load operation while maintaining power factor improvement in heavy-load operation
Solution Approach 2:
The invention changes operational parameters (number of active switching elements, timing of operations) based on load conditions. In light-load operation, the system operates with one switching element and controls the backflow-preventing rectifying element to reduce conduction loss. In heavy-load operation, it switches to two elements operating in synchronization, improving power factor. This parameter adaptation resolves the contradiction between conduction loss and power factor
2Loss of energy
If two switching elements are operated in light-load operation, then harmonic components are reduced, but efficiency decreases due to conduction loss in backflow-preventing rectifying elements
Solution Approach 1:
The system dynamically adjusts its operation based on load conditions, switching between a first operation mode (one switching element for light-load) and a second operation mode (two switching elements for heavy-load). This dynamic operation reduces conduction loss in light-load conditions while maintaining efficiency in heavy-load conditions, resolving the contradiction between conduction loss and overall efficiency
Solution Approach 2:
The invention changes operational parameters including the number of active switching elements and their timing based on load conditions. By controlling the backflow-preventing rectifying element in light-load operation and using two synchronized elements in heavy-load operation, the system optimizes efficiency across different operating conditions, resolving the contradiction between conduction loss and efficiency
Data Source
AI summary
A direct-current power supply device includes a first capacitor and a second capacitor connected in series between output terminals to a load, a charging unit including a first switching element that switches charging and non-charging of the first capacitor, a second switching element that switches charging and non-charging of the second capacitor, a first backflow preventing element that prevents charged electric charges of the first capacitor from backflowing to the first switching element, and a second backflow preventing element that prevents charged electric charges of the second capacitor from backflowing to the second switching element, and a control unit that controls the first backflow preventing element to an ON state at timing when the charging of the first capacitor is started and controls the second backflow preventing element to the ON state at timing when the charging of the second capacitor is started.