Charge Pump Circuit With Variable 1x-2x Boost and Step-Down
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Solution Overview
Problem
Existing charge pump circuits cannot achieve boosting ratios less than two times and do not allow continuous variation of the boosting ratio with low loss, and they also lack the ability to perform step-down operations in the reverse direction.
Innovation Solution
A charge pump circuit with a configuration that includes a charging stand, capacitors, reactors, FETs, and a control unit, allowing for continuous adjustment of boosting ratios between 1 to 2 times by alternating modes of operation, and enabling step-down operations through reverse mode switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional charge pump circuit with fixed boosting ratios is used, then the circuit structure is simple, but the boosting ratio cannot be continuously adjusted and is limited to discrete values (1x, 2x)
Solution Approach 1:
The charge pump circuit is divided into multiple boosting cell groups (first, second, third groups), each containing series-connected FETs and capacitors. By independently controlling the switching of each cell group through separate control signals, the circuit can achieve discrete boosting ratios (1x, 1.5x, 2x) and continuously adjust between them by combining different cell group configurations.
Solution Approach 2:
The circuit employs dynamic switching control where the connection configuration of boosting cells can be changed in real-time. The control unit adjusts the switching states of FETs in different cell groups to dynamically reconfigure the circuit topology, enabling continuous boosting ratio adjustment from 1x to 2x with minimal switching loss.
2Adaptability or versatility
If the boosting ratio is changed by switching between different modes, then the adaptability improves, but switching loss increases
Solution Approach 1:
The circuit performs preliminary charging of capacitors in each boosting cell group before switching modes. By pre-charging the necessary capacitors during the operation, the circuit minimizes the energy loss that would otherwise occur during mode transitions, enabling smooth and efficient boosting ratio changes.
Solution Approach 2:
The control unit ensures continuous operation by maintaining at least one boosting cell group in active charging mode during transitions. This continuity approach prevents complete shutdown and restart cycles, thereby reducing switching losses and maintaining efficient power conversion during boosting ratio adjustments.
3Adaptability or versatility
If multiple FETs and capacitors are connected in series and parallel configurations, then the boosting ratio flexibility increases, but the device complexity increases
Solution Approach 1:
Each boosting cell group is designed as a universal module that can function in multiple configurations. The same basic structure of FETs and capacitors in each group can be arranged in series or parallel depending on the desired boosting ratio, reducing the need for completely separate circuit paths for different boosting modes.
Solution Approach 2:
The circuit merges multiple boosting cell groups into a unified structure where capacitors and FETs from different groups can be combined in series or parallel. This consolidation allows the circuit to achieve various boosting ratios (1x, 1.5x, 2x) using a shared set of components rather than requiring separate dedicated paths for each ratio.
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
Enables continuous adjustment of boosting ratios with minimal loss and supports both boosting and step-down operations, enhancing efficiency and flexibility in power management systems.
Implementation Method 1
a reactor and a second capacitor connected in series with each other and connected in parallel with the charging stand
Data Source
AI summary
A charge pump circuit includes: a charging stand; a battery connected in series with the charging stand; a first capacitor connected in parallel with the charging stand; a reactor and a second capacitor connected in series and connected in parallel with the charging stand; first, second, fifth, and sixth FETs connected to the charging stand; third and fourth FETs connected in series and connected in parallel with the charging stand; third and fourth capacitors connected in series and connected in parallel with the charging stand; and a control unit. Further, the control unit performs a boosting ratio 1.5 times mode by performing a boosting ratio 1 time mode and a boosting ratio 2 times mode in a predetermined order.