Switched Capacitor Charging Circuit for Low-Voltage High Power
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Solution Overview
Problem
Existing charging apparatuses face challenges in reducing volume, weight, and cost while maintaining high output power, particularly when input voltage is low.
Innovation Solution
A charging apparatus with a control module, first switch, and multiple capacitors connected in series, where the number of capacitors turned on is controlled based on input voltage, allowing for efficient power delivery by adjusting the series connection of capacitors to match varying input voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a capacitor with high capacitance is used to achieve high output power at low input voltage, then the output power requirement is met, but the volume, weight, and cost of the charging apparatus increase
Solution Approach 1:
The patent divides a single large capacitor into multiple smaller capacitors connected in series. Each capacitor has lower individual capacitance and smaller volume, but when connected in series, they collectively provide the necessary voltage multiplication effect to achieve high output power without requiring a single large-volume high-capacitance capacitor. The control module dynamically configures the series connection based on input voltage levels.
Solution Approach 2:
The patent implements dynamic switching between different numbers of series-connected capacitors based on the input voltage level. The control module adjusts the configuration in real-time: using more capacitors in series when input voltage is low to boost output voltage, and fewer capacitors when input voltage is high. This dynamic adaptation allows the system to maintain high output power across varying input conditions without requiring the maximum capacitor volume throughout.
2Power
If a capacitor with high capacitance is used to achieve high output power at low input voltage, then the output power requirement is met, but the weight of the charging apparatus increases
Solution Approach 1:
The patent divides a single large capacitor into multiple smaller capacitors connected in series. Each capacitor has lower individual capacitance and smaller weight, but when connected in series, they collectively provide the necessary voltage multiplication effect to achieve high output power without requiring a single large-weight high-capacitance capacitor.
Solution Approach 2:
The control module dynamically switches between different numbers of series-connected capacitors based on input voltage. This dynamic configuration allows the system to achieve high output power when needed while minimizing the effective capacitance weight by not always requiring all capacitors to be fully engaged, reducing overall apparatus weight.
3Power
If a capacitor with high capacitance is used to achieve high output power at low input voltage, then the output power requirement is met, but the cost of the charging apparatus increases
Solution Approach 1:
The patent divides a single large capacitor into multiple smaller capacitors. Smaller capacitors are generally less expensive to manufacture and purchase than a single large capacitor of equivalent total capacitance. The series connection allows the system to achieve the necessary voltage boost for high output power while using multiple lower-cost components.
Solution Approach 2:
The dynamic switching capability allows the system to optimize performance based on actual operating conditions. By only engaging the necessary number of capacitors in series based on input voltage levels, the system avoids the need for a permanently configured high-capacitance setup, reducing overall component costs while maintaining high output power capability when required.
Data Source
AI summary
A charging apparatus and an electronic device are provided. The charging apparatus includes a control module, a first switch, at least one second switch, and a plurality of capacitors, where the plurality of capacitors are connected in series; grounding between two adjacent capacitors in the plurality of capacitors is implemented through one second switch; in the plurality of capacitors, the first one of the plurality of capacitors is connected to an input voltage, and the last one of the plurality of capacitors is grounded through the first switch; and the control module controls, through the first switch and the at least one second switch based on the input voltage, the number of capacitors that are turned on in series, where the number of capacitors that are turned on in series is positively related to the input voltage.