Bi-directional Multi-mode Charge Pump Circuit
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Solution Overview
Problem
Conventional charge pumps operate unidirectionally, limiting their applicability in device applications that require bidirectional charge transfer, and often necessitate the use of multiple pumps or large multiplexing circuitry, which increases area and complexity.
Innovation Solution
A bi-directional charge pump circuit that can operate in multiple modes, transferring charge between supply power nodes in both directions, incorporating a transistor-controlled circuit with a droop detection and control unit to manage charge flow during different operational states, thereby reducing area and control complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional unidirectional charge pumps are used, then charge transfer in one direction is achieved, but bidirectional charge transfer capability is lost and multiple pumps or large multiplexing circuitry is required
Solution Approach 1:
The charge pump circuit is designed to perform multiple functions by enabling bidirectional charge transfer capability within a single pump structure. The circuit can operate in different modes (first mode for forward charge transfer, second mode for reverse charge transfer) by controlling the switching elements, eliminating the need for separate unidirectional pumps for each direction and reducing overall system complexity
2Adaptability or versatility
If multiple unidirectional charge pumps are used to achieve bidirectional transfer, then bidirectional capability is obtained, but circuit area increases
Solution Approach 1:
The patent merges the functionality of multiple unidirectional charge pumps into a single bi-directional charge pump circuit. By combining the charge transfer paths and sharing common components (capacitors, switching elements, control logic) between forward and reverse operations, the circuit area is significantly reduced compared to using separate unidirectional pumps for each direction
3Adaptability or versatility
If multiple unidirectional charge pumps are used, then bidirectional charge transfer is achieved, but control complexity increases
Solution Approach 1:
The control logic is designed to universally manage both forward and reverse charge transfer operations through a single control interface. By using mode-select signals that control the switching elements in different configurations, the same control circuitry handles both directions of charge transfer, reducing control complexity compared to managing multiple independent unidirectional pumps
Data Source
Figure 1A~1B
Figure 1C~1D
Figure 1E
AI summary
Some embodiments include apparatus and methods using a charge pump coupled to a first supply power node and a second supply power node. The charge pump is arranged to transfer charge from the first supply power node to the second supply power node during a first time interval and to transfer charge from the second supply power node to the first supply power node during a second time interval.