Flying-Capacitor DC-DC Converter for High-Voltage High-Power Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional DC-DC resonant converters struggle to simultaneously meet the demands of high input voltage and high-power applications.
Innovation Solution
The DC-DC converter incorporates pairs of flying capacitors and subcircuits, allowing for the adjustment of switching frequency to control the DC output voltage, suitable for high input voltage and high-power applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional DC-DC resonant converter topology is used, then the structure is simple and operation is easy, but it cannot simultaneously meet high input voltage and high-power application requirements
Solution Approach 1:
The converter is divided into multiple modular units including N upper switches, N lower switches, N pairs of flying capacitors, and N subcircuits. Each module can be independently configured and connected in series/parallel combinations, allowing the system to be scaled and adapted for high voltage and high power applications while maintaining manageable complexity through standardization
Solution Approach 2:
The converter employs dynamic switching of the N upper and lower switches with adjustable switching frequency. The switching pattern and frequency can be dynamically controlled to optimize performance for different operating conditions, enabling the converter to adapt to high input voltage and high-power requirements while maintaining simple operational control
2Measurement precision
If switching frequency is adjusted to control DC output voltage, then output voltage control precision is improved, but switching losses increase
Solution Approach 1:
The converter uses periodic switching of the N upper and lower switches at a controlled frequency. By adjusting the switching frequency and duty cycle in a periodic manner, precise DC output voltage control is achieved while the resonant nature of the circuit minimizes switching losses through soft switching conditions
Solution Approach 2:
The converter changes the switching frequency parameter to control the DC output voltage. The N pairs of flying capacitors and subcircuits are configured to resonate at different frequencies, allowing voltage control through frequency adjustment while maintaining efficient operation by staying within optimal switching ranges that minimize losses
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 converter effectively handles high input voltage and high-power applications by optimizing the connection of flying capacitors and subcircuits, enhancing its suitability for such demanding conditions.
Implementation Method 1
The resonant converter includes a resonant-tank circuit for shaping the switch voltage and/or the current waveform to minimize switching losses and allow high-frequency operation
Implementation Method 2
The DC-DC converter receives a DC input voltage from a voltage source and converts it to a DC output voltage through N upper switches, N lower switches, N pairs of flying capacitors and N subcircuits
Data Source
AI summary
A DC-DC converter includes N upper switches, N lower switches, N pairs of flying capacitors and N subcircuits. The N lower switches are electrically connected between the N upper switches and the second terminal of the voltage source. A n-th pair of flying capacitors is coupled between a common node between the n-th and (n+1)-th upper switches and a common node between the n-th and (n+1)-th lower switches. A N-th pair of flying capacitors is coupled with the N-th upper switch and the N-th lower switch. A first subcircuit is coupled between a common node between the first upper switch and the first lower switch and a middle node of a first pair of flying capacitors. A i-th subcircuit is coupled between a middle node of a (i−1)-th pair of flying capacitors and a middle node of a i-th pair of flying capacitors.