Solar Power Tracking Circuit Using Open-Circuit Voltage Lookup
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Solution Overview
Problem
Existing power tracking methods for solar batteries in portable electronic products are inefficient in adapting to changing luminance environments, either resulting in suboptimal power output or high power consumption due to complex logical operations.
Innovation Solution
A power tracking device comprising a power voltage setting circuit, a switch, and a voltage memory circuit that stores and adjusts the open circuit voltage of a solar battery to set an output voltage corresponding to a predetermined percentage of the open circuit voltage, allowing for efficient power tracking without complex logical operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dynamic tracking of real maximum power point is implemented, then power output performance is improved, but power consumption increases and operating time extends
Solution Approach 1:
The patent pre-calculates and stores the relationship between open-circuit voltage and maximum power point voltage in a lookup table before operation. During actual power tracking, the system only needs to query the table using the measured open-circuit voltage, avoiding complex real-time calculations and microcontroller operations, thus reducing power consumption while maintaining accurate power tracking
Solution Approach 2:
The patent replaces complex electronic control systems (microcontrollers with logic determination) with a simpler voltage division circuit and lookup table approach. The voltage division circuit physically divides the open-circuit voltage to generate the power voltage directly, substituting electronic computation with analog circuitry that consumes less power
2Use of energy by moving object
If a fixed point is determined as maximum power point, then power consumption is reduced, but adaptability to changing environment is lost
Solution Approach 1:
The patent pre-calculates maximum power point voltages for various luminance conditions and stores them in a lookup table indexed by open-circuit voltage. When environmental conditions change, the system automatically retrieves the appropriate pre-calculated value based on the current open-circuit voltage, achieving environmental adaptability without requiring complex real-time computation
Solution Approach 2:
The system uses the open-circuit voltage itself as the key to retrieve the corresponding maximum power point voltage from the lookup table. The open-circuit voltage naturally varies with environmental conditions (luminance), and this variation automatically selects the appropriate pre-stored value, making the system self-adapting to environmental changes without external control
Data Source
AI summary
A power tracking device and a power tracking method is disclosed herein. The power tracking device includes a power voltage setting circuit, a switch, a switching signal circuit, and a voltage memory circuit. The switching signal circuit is configured for sending a first control signal to the switch. When the switch receives the first control signal and electrically isolates the power source and the power voltage setting circuit, the voltage memory circuit stores an open circuit voltage of the power source and sends a setting voltage relative to the open circuit voltage, and when the switch receives the first control signal and electrically connects the power source and the power voltage setting circuit, the power voltage setting circuit sets an output voltage of the power source to correspond with the setting voltage.