Battery Bypass Circuit for Low-Current Machine Tool Wake-Up
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Solution Overview
Problem
Existing accumulators for machine tools do not provide a low enough current intensity for wake-up calls when in an energy-saving idle state, making it difficult to bring the control electronics and electric motor back into a standby or operational state efficiently.
Innovation Solution
Incorporating a bypass circuit that operates in two modes, allowing a high current to flow during idle states and a lower current for wake-up calls, with a comparator to switch between modes based on required current values, ensuring energy efficiency and enabling wake-up functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the accumulator is completely switched off in idle state to save energy, then energy consumption is reduced, but the control electronics cannot receive sufficient current for wake-up calls
Solution Approach 1:
The current delivery system is segmented into two distinct paths: a main current path for high current delivery during operation, and a secondary current path for low current wake-up calls during idle state. This segmentation allows each path to be optimized independently, resolving the contradiction between energy saving and wake-up functionality.
Solution Approach 2:
A secondary switch is introduced as an intermediary component that controls the secondary current path. This intermediary allows precise control over when low current should be delivered to the control electronics, enabling wake-up calls without requiring the main switching unit to be fully operational.
2Reliability
If high current is always delivered to maintain wake-up capability, then wake-up calls are reliable, but energy is wasted during idle states
Solution Approach 1:
The system dynamically switches between two operating modes: during idle state, only the secondary current path is active providing low current; during operation, the main current path is activated providing high current. This dynamic adaptation resolves the contradiction by adjusting current delivery based on actual system state.
Solution Approach 2:
The current intensity parameter is changed based on system state: low current (second current value) during idle state and high current (first current value) during operation. This parameter change allows the system to maintain wake-up capability when needed while minimizing energy consumption during idle periods.
3Loss of energy
If the main switching unit completely interrupts current flow for energy saving, then energy efficiency is improved, but the control electronics cannot be awakened
Solution Approach 1:
The switching functionality is segmented into two independent switching units: a main switching unit for controlling the main current path, and a secondary switching unit for controlling the secondary current path. This segmentation allows the secondary switch to maintain wake-up capability independently of the main switch's state.
Solution Approach 2:
The secondary current path acts as an intermediary channel that bypasses the main switching unit's complete interruption. This intermediary path ensures that even when the main switch fully interrupts current flow for maximum energy saving, a minimal current flow continues through the secondary path to enable wake-up calls.
Data Source
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AI summary
The invention relates to a rechargeable battery for a machine tool containing at least one energy storage cell and a switching device. The rechargeable battery contains a bypass circuit, which can be operated in a first and second mode, wherein, in the first mode, the bypass circuit is in a rest state so that an electric current with a first current value passes from the at least one energy storage cell to the machine tool via the switching device and wherein, in the second mode, the bypass circuit is in an operating state so that an electric current with a second current value passes from the at least one energy storage cell to the machine tool via the bypass circuit, and wherein the first current value is greater than the second current value, wherein the bypass circuit contains a comparator for comparing a current value required by the machine tool with a stored current threshold value so that the bypass circuit is put in the first mode by means of a switching element when the current value required by the machine tool exceeds the threshold value, and the bypass circuit is put in the second mode when the current value required by the machine tool undershoots the threshold value.