Battery Control Circuit with Time-Managed Power Modes
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Solution Overview
Problem
Existing battery control circuits for managing State of Charge (SOC) in power supply devices with multiple electric storage means connected in series lack simplicity and efficiency in reducing SOC when it is high, and in balancing SOC across multiple batteries.
Innovation Solution
A battery control circuit with a voltage detection circuit, switches for parallel resistance connection, a signal input/output circuit, and a power supply circuit with low consumption current mode, along with a time management circuit to manage operation periods and shift modes, enabling continuous operation and enhanced SOC balancing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the battery control circuit operates continuously in normal mode to reduce SOC when high, then the SOC reduction speed increases, but the power consumption increases
Solution Approach 1:
The power supply circuit dynamically switches between normal mode and low consumption current mode based on operational needs. The control circuit adjusts its operating state in real-time, transitioning to low consumption mode after completing SOC balancing tasks or when idle, thereby optimizing the trade-off between SOC reduction speed and power consumption.
Solution Approach 2:
The control circuit employs periodic operation by alternating between active SOC balancing periods and idle low-consumption periods. The power supply circuit is configured to operate in normal mode only when SOC balancing is required, and switch to low consumption current mode during idle periods,实现ing periodic action that reduces overall power consumption while maintaining productivity when needed.
2Use of energy by moving object
If the power supply circuit switches to low consumption current mode immediately after operation stop, then power consumption decreases, but SOC balancing cannot be completed
Solution Approach 1:
The control circuit performs preliminary SOC balancing operations before switching to low consumption current mode. The power supply circuit is designed to complete necessary SOC equalization tasks among battery cells before transitioning to idle mode, ensuring that reliability requirements are met before power consumption is reduced.
Solution Approach 2:
The control circuit autonomously monitors SOC levels and determines when switching to low consumption mode is appropriate. The system self-manages the transition timing based on internal SOC measurements, ensuring that SOC balancing is sufficiently completed before reducing power consumption, without requiring external intervention or complex timing circuits.
3Stability of the object's composition
If multiple battery cells are balanced using individual resistance connections, then SOC distribution uniformity improves, but device complexity increases
Solution Approach 1:
The control circuit merges the SOC balancing control functions into a single integrated microcontroller unit. Instead of requiring separate control circuits for each battery cell, the invention uses one control circuit to manage all switching operations for multiple battery cells, thereby improving SOC distribution uniformity while minimizing device complexity through functional integration.
Solution Approach 2:
The power supply circuit is designed with multi-functionality, serving both as the power source for the control circuit and as the switching mechanism for SOC balancing. The same power supply circuit that powers the control circuitry also enables the switching of battery cell connections to resistances, eliminating the need for separate balancing circuitry and reducing overall device complexity.
Data Source
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Figure 3A
AI summary
A battery control circuit includes a voltage detection circuit (124) for measuring voltages of electric cells (111), balancing circuits for balancing the voltages or SOCs of the electric cells (111), a signal input/output circuit (129) for communicating with the outside, a power supply circuit (126) having two modes: a normal mode and a low consumption mode, and a time management circuit (127). It receives a signal containing a period of time until the shift of the power supply circuit (126) from the normal mode to the low consumption mode, and stores it in the time management circuit (127). If a command from the outside has not been sent for a predetermined period of time or when an operation stop command has been sent from the outside, the time management circuit (127) causes the power supply circuit (126) to continuously operate in the normal mode. Then, the battery control circuit monitors an operation continuation period in the normal mode, and causes the power supply circuit (126) to shift to the low consumption mode when the operation continuation period matches the stored period of time.