Multimode Battery Charger Circuit Dynamic Mode Switching
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Solution Overview
Problem
Existing battery charger designs for mobile devices are limited to either switching or linear modes, making them inflexible and requiring new designs for varying power requirements, which can lead to increased semiconductor die area and power consumption.
Innovation Solution
A multimode battery charger circuit that can dynamically switch between switch mode and linear mode operations using shared common circuitry, enabling real-time adaptability and reducing semiconductor die area and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a battery charger is designed to operate as either switching or linear charger with dedicated control blocks, then the charger can perform its charging function, but the semiconductor die area increases and design flexibility decreases
Solution Approach 1:
The patent implements a universal battery charger circuit that can operate in both switching and linear charging modes using the same hardware components. The control block dynamically selects between different charging algorithms based on system requirements, allowing one charger design to serve multiple charging mode needs without requiring separate dedicated circuits for each mode.
Solution Approach 2:
The charger employs dynamic mode switching capability where the control block can transition between switching and linear charging modes in real-time based on battery state, power requirements, and system conditions. This dynamic adaptability allows the same hardware to optimize performance for different scenarios without physical reconfiguration.
2Reliability
If dedicated control blocks are used for switching or linear charger operation, then the charger can maintain stable operation in its designated mode, but power consumption increases and design adaptability decreases
Solution Approach 1:
A single control block is designed to handle both switching and linear charging operations, eliminating the need for multiple dedicated control circuits. This universal control approach maintains stable operation in either mode while reducing the overall power consumption associated with having multiple active control blocks ready to operate.
Solution Approach 2:
The patent extracts the essential control functions common to both switching and linear chargers into a single unified control block, removing the redundancy of having separate control circuits for each mode. This extraction maintains the stability benefits of dedicated control while eliminating the excessive power consumption of having both control blocks simultaneously available.
3Power
If the system requires additional power with external power transistors, then the power delivery capability increases, but design modifications are required and complexity increases
Solution Approach 1:
The control block is designed with universal power management capability that can accommodate both integrated and external power transistor configurations. When additional power delivery is required, the system can utilize external power transistors without requiring fundamental design modifications, as the control block already supports multiple power delivery architectures through its adaptable control algorithms.
Data Source
AI summary
A multimode battery charger circuit supporting switch mode and linear mode charging operations. In various embodiments, the multimode battery charging circuit includes mode control circuitry, a linear gate driver, a pulse width modulation (PWM) control circuit, a programmable constant current control loop circuit, and a programmable constant voltage control loop circuit. In operation, the mode control circuitry receives a charge mode indication signal corresponding to a desired charge mode. Based on this signal, the mode control circuitry enables either the linear gate driver or PWM control circuit to provide control signals to output transistors coupled between an adapter power port and a battery pack, thereby supporting a plurality of charging modes. In some embodiments, one or more of the output transistors are formed on a common substrate with the multimode battery charger circuit.