Power Transfer Circuit Proclaims Capability to Prevent Collapse
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Solution Overview
Problem
Conventional power transfer mechanisms, such as those using adaptive input current control (AICC), often lead to power collapse in wireless charging systems due to the limited power capability of wireless power transmitter units (PTUs) and coil efficiency issues, causing instability in charging processes.
Innovation Solution
A power transfer circuit and method that includes a voltage regulation circuit and a control circuit to detect output current and generate a control signal, adjusting the output voltage to proclaim a power capability and program a suitable voltage-current (V-I) curve, thereby preventing power collapse by informing the charger of its power limitations and dynamically adjusting current draw.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If adaptive input current control (AICC) is used to track maximum power capability, then power utilization is improved, but power collapse occurs due to limited wireless PTU power and coil efficiency
Solution Approach 1:
The patent applies preliminary action by having the voltage regulation circuit proactively adjust the output voltage based on detected output current before power collapse occurs. The control circuit continuously monitors the output current and preemptively modifies the voltage to maintain power within safe limits, preventing the DC bus voltage collapse that would otherwise occur with AICC alone.
Solution Approach 2:
The patent implements feedback by having the control circuit detect the output current and use this information to generate control signals that adjust the output voltage. This closed-loop feedback mechanism allows the system to respond to actual power conditions and maintain stable operation, resolving the power collapse issue while preserving power utilization benefits.
2Reliability
If output voltage is adjusted to proclaim power capability, then power collapse is prevented, but system complexity increases due to additional control mechanisms
Solution Approach 1:
The control circuit performs multiple functions: it detects output current, determines power capability, generates control signals, and adjusts output voltage. By making the control circuit multi-functional, the patent avoids adding separate dedicated components for each function, thereby limiting the increase in system complexity while achieving reliable power collapse prevention.
Solution Approach 2:
The patent merges the power capability proclamation function with the existing voltage regulation mechanism. The control circuit combines current detection, power calculation, and voltage adjustment into a unified control system, reducing overall system complexity compared to having separate independent mechanisms for each function.
Data Source
AI summary
A power transfer circuit for transferring electrical power from a power source to a charger is provided. The power transfer circuit includes a voltage regulation circuit and a control circuit. The voltage regulation circuit is arranged for providing an output voltage for the charger, and adjusting the output voltage according to a control signal, wherein the charger draws an output current from the voltage regulation circuit according to the output voltage. The control circuit is coupled to the voltage regulation circuit, and is arranged for detecting the output current to generate a detection result, and generating the control signal at least according to the detection result.