Pulse Current Parallel Charger Noise Isolation
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Solution Overview
Problem
Faster charging of batteries for mobile devices poses a challenge in retaining cycle life, as existing charging systems can introduce disruptive noise to the load during pulse charging, affecting the battery's longevity.
Innovation Solution
A system and method that decouples the battery from the load during faster pulse charging using a switch, allowing a first charging source to charge the battery quickly while a second source powers the load, thereby isolating noise from the load's input node.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single buck charger or dual parallel buck chargers are used to charge the battery, then the charging system is simple and the load can be powered continuously, but the charging speed is slow and cannot provide fast charging capability
Solution Approach 1:
The charging system is segmented into two independent charging sources: a first charging source (pulse charger) dedicated to fast charging the battery, and a second charging source (buck charger) dedicated to powering the load. This segmentation allows each charging source to operate independently at its optimal performance level, enabling fast charging without compromising load power supply continuity.
Solution Approach 2:
The patent combines two different charging sources (pulse charger and buck charger) into a unified charging system that serves dual purposes: fast charging the battery and powering the load. By merging these sources with a switching mechanism, the system achieves both fast charging capability and continuous load power supply.
2Reliability
If pulse charging is used to extend battery cycle life, then the battery longevity is improved, but disruptive noise is introduced to the load during charging
Solution Approach 1:
The patent extracts the pulse charging function into a separate first charging source that operates independently from the load power supply path. By taking out the pulse charging operation from the shared charging path, the disruptive noise generated during pulse charging is isolated and prevented from affecting the load, while still enabling fast charging to extend battery cycle life.
Solution Approach 2:
The battery switch acts as an intermediary component that controls the connection between the battery and the load input node. During pulse charging, the switch decouples the battery from the load, serving as a mediator that allows pulse charging to occur without transmitting disruptive noise to the load, while still enabling the battery to be charged at high speed.
3Object-affected harmful factors
If the battery is decoupled from the load during fast charging using a switch, then disruptive noise is prevented from affecting the load, but the system complexity increases
Solution Approach 1:
The battery switch serves multiple functions: it decouples the battery from the load during pulse charging to prevent noise interference, enables fast charging operation, and maintains system continuity for load power supply. This multi-functionality reduces the need for additional specialized components, thereby limiting the increase in system complexity.
4Ease of operation
If dual parallel buck chargers are used to power the load and charge the battery simultaneously, then the load can be powered continuously, but the charging speed remains slow and cannot achieve fast charging
Solution Approach 1:
The patent introduces dynamic switching control that allows the system to transition between different operating modes: normal mode where the buck charger powers the load, and fast charging mode where the pulse charger charges the battery at high speed while the switch decouples the battery from the load. This dynamic operation enables the system to achieve fast charging without compromising continuous load power supply capability.
Data Source
AI summary
Faster charging of a battery, including: opening a first switch disposed between an input node of the battery and an input node of a load to decouple the input node of the battery from the input node of the load; and charging the battery using a first charging source coupled to the input node of the battery while the load is being powered through the input node of the load via a second charging source having a charge rate slower than the first charging source.