Battery AC Output Circuit Without an Inverter
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Solution Overview
Problem
Conventional battery packs require an inverter to convert DC power to AC power, increasing cost, size, and reducing energy density due to the additional components and power switching losses.
Innovation Solution
An AC power output device that generates and outputs AC power from batteries connected in series or parallel using switch control without the need for an inverter, comprising a switching component, a filter component, and a controller to manage the operational states and prioritize battery usage based on state of charge (SOC) and state of health (SOH).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an inverter is used to convert DC power to AC power, then AC power can be output from battery packs, but the cost, size, and device complexity increase due to additional components and power switching losses
Solution Approach 1:
The patent extracts and removes the inverter component from the battery pack system. By using direct switch control of battery connections to generate AC power, the inverter is completely eliminated, reducing production cost and device complexity while maintaining the AC power output function
Solution Approach 2:
The patent merges the functions of the inverter into the switch control mechanism. The switching component that controls battery connections is designed to directly generate AC waveforms through controlled switching sequences, combining what were previously separate functions into a unified system
2Ease of manufacture
If an inverter is used to convert DC power to AC power, then AC power can be output from battery packs, but the size and energy density are reduced due to additional components
Solution Approach 1:
The inverter component is extracted and removed from the battery pack, directly reducing the volume occupied by additional components and improving energy density while maintaining AC power output capability
3Power
If an inverter is used to convert DC power to AC power, then AC power can be output from battery packs, but power switching losses increase due to the additional components
Solution Approach 1:
The inverter is removed from the system, eliminating the source of power switching losses associated with inverter operation while maintaining the ability to output AC power through direct battery switch control
4Productivity
If batteries are discharged without priority management, then AC power can be output quickly, but degradation imbalance occurs reducing battery lifespan
Solution Approach 1:
The controller continuously monitors the state of charge and state of health of each battery, using this feedback information to dynamically adjust switching sequences and discharge priorities, ensuring balanced usage and preventing degradation imbalance while maintaining power output capability
Solution Approach 2:
The discharge priority management is dynamic rather than static. The controller adjusts the discharge sequence and switching patterns in real-time based on the current state of each battery, allowing the system to adapt to changing battery conditions and maintain optimal performance
Data Source
AI summary
An AC power output device includes a switching component connected to each of a plurality of batteries and configured to turn ON or OFF an electrical connection between a corresponding battery and another battery depending on an operational state, a filter component configured to receive an output voltage from the plurality of batteries, to adjust a polarity of the output voltage from the plurality of batteries according to an operational state, and to output the voltage of the adjusted polarity, and a controller configured to control the operational states of the switching component and the filter component so that the AC power is output from the plurality of batteries.