PV DC Coupling for EV Charging Without Inverters or Batteries
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Solution Overview
Problem
The inefficiency and high cost of charging electric vehicles (EVs) and heating water using photovoltaic (PV) systems due to the need for expensive battery storage and inverters, leading to electrical losses and increased grid demand.
Innovation Solution
An electronic and electrical control unit is installed between PV panels and EVs or water heaters, allowing direct DC power usage without batteries or inverters, configuring PV panels to match EV battery voltages and optimizing energy distribution for cost-effective charging and heating, especially in office parking lots where EVs are parked for extended periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If PV systems use inverters and battery storage to charge EVs and heat water, then the systems can operate flexibly and provide power at any time, but the equipment costs and electrical losses increase significantly
Solution Approach 1:
The patent extracts and removes the inverter and battery storage components from the PV system, creating a simplified direct DC coupling architecture. This eliminates the need for expensive conversion equipment while maintaining the core functionality of charging EVs and heating water directly from PV panels.
Solution Approach 2:
The control unit serves multiple functions: it manages PV panel configuration, regulates DC power distribution, charges EV batteries, and controls water heating. This multi-functional approach replaces the need for separate inverters and battery management systems, reducing overall system complexity and cost.
2Adaptability or versatility
If PV systems use inverters to convert DC to AC for EV charging, then the EVs can be charged using standard AC infrastructure, but electrical losses occur during conversion
Solution Approach 1:
The patent replaces the mechanical/electrical conversion process (DC to AC conversion via inverter) with a direct electrical connection. DC power from PV panels is transmitted directly to EV batteries without intermediate conversion, eliminating conversion losses while maintaining charging functionality.
3Duration of action of moving object
If PV panels are used to generate electricity for night-time water heating, then hot water is available when needed, but expensive battery storage and inverters are required
Solution Approach 1:
The system performs preliminary action by heating water during daytime when PV panels generate excess electricity. The control unit directs DC power to water heating elements, storing thermal energy in the water itself rather than using expensive electrical battery storage. This pre-heating ensures hot water availability without requiring night-time power conversion.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution reduces equipment and charging costs by eliminating the need for expensive inverters and batteries, enabling efficient and cost-effective EV charging and water heating using PV-generated DC power, while optimizing energy usage and reducing grid demand.
Implementation Method 1
A PV system produces direct current (DC)
Implementation Method 2
The functions of the control unit are as follows: The control unit determines if the connector is plugged into an EV and, if not plugged in, power is cut to the connector. This means no power is present at the connector when the connector is not plugged into an EV.
Data Source
AI summary
A photovoltaic energy generation system which through the use of controlled switches a DC energy output from the system is used to deliver DC energy to a load, in particular to charge an electric vehicle, without using switch mode DC to DC, or DC to AC, converters.