Inductorless Switched-Capacitor Converter with Variable Frequency Modulation
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Solution Overview
Problem
Conventional DC-DC converters with inductor-based topologies face design challenges and inefficiencies, particularly at light loads, and require complex frequency modulation schemes that are difficult to implement effectively.
Innovation Solution
An inductorless switched-capacitor (SC) converter topology with a ladder SC circuit and a variable frequency modulation (VFM) scheme based on load conditions, using a lookup table to determine switching frequency and duty cycle parameters for improved efficiency and reduced noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If inductor-based topologies are used in conventional DC-DC converters, then power conversion capability is achieved, but design complexity and inefficiency increase particularly at light loads
Solution Approach 1:
The patent removes the inductor component from the converter topology, extracting the problematic element that caused design complexity and light-load inefficiency. The inductorless switched-capacitor topology achieves power conversion through capacitor charging/discharging cycles controlled by switches, eliminating the need for magnetic components and their associated design challenges.
Solution Approach 2:
The patent replaces the magnetic field-based energy storage and transfer mechanism of inductors with an electric field-based capacitor switching mechanism. This substitution changes the fundamental operating principle from electromagnetic induction to capacitive charge transfer, simplifying the topology and improving manufacturability.
2Productivity
If conventional frequency modulation schemes are used, then power conversion is achieved, but implementation difficulty increases due to complexity
Solution Approach 1:
The patent implements variable frequency modulation where the switching frequency dynamically adapts based on load conditions. The controller adjusts the frequency of capacitor charging/discharging cycles according to the instantaneous power demand, optimizing efficiency across varying load conditions while maintaining manageable implementation complexity through systematic control logic.
Solution Approach 2:
The patent changes the operating frequency parameter dynamically to optimize performance. By varying the switching frequency based on load requirements, the system achieves high power conversion efficiency across different operating points without requiring complex modulation schemes, as the frequency adjustment follows a systematic approach tied to power demand.
3Ease of operation
If fixed frequency operation is used, then circuit operation is simple, but efficiency and noise performance deteriorate across varying load conditions
Solution Approach 1:
The patent transitions from fixed frequency operation to dynamic variable frequency operation. The switching frequency automatically adjusts in response to load conditions, maintaining high conversion efficiency across the entire load range. This dynamic adaptation prevents energy losses that would occur with fixed frequency operation under varying power demands while keeping the control logic relatively simple.
Solution Approach 2:
The patent modifies the frequency parameter based on operating conditions to optimize efficiency. By changing the switching frequency according to load requirements, the system maintains peak efficiency across varying power levels rather than operating at a fixed suboptimal frequency, thereby reducing energy losses without significantly complicating the circuit operation.
4Power
If inductor-based topologies are used, then power conversion capability is provided, but board space requirements increase
Solution Approach 1:
The patent extracts and removes the inductor component from the power conversion topology. Inductors typically require substantial board space due to their magnetic core and winding structure. By eliminating this component and using only capacitors and switches, the design achieves compact integration and significantly reduced board space requirements while maintaining full power conversion capability.
Solution Approach 2:
The patent substitutes the bulky magnetic-based inductor with compact electric-field-based capacitor switching elements. Capacitors occupy far less board space than inductors of equivalent power handling capability. This substitution enables miniaturization and compact integration of the power converter while preserving the essential power conversion function through alternative electromagnetic principles.
Data Source
AI summary
The present embodiments are directed to an improved switched capacitor (SC) converter topology that does not include an inductor. In particular, the topology includes a ladder SC circuit configured as a cap divider, with a gate driving signal being generated to initiate the charging and discharging of the capacitor. In this specific topology, an unregulated output voltage is produced that is a certain fraction of an input voltage of a power source such as a battery. The present embodiments further include a variable frequency modulation (VFM) scheme based on the current-sensing techniques for the gate driving signal generation of the switched capacitor converter.