Voltage Drop Detection Circuit for Buffered Battery Packs
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Solution Overview
Problem
Existing devices struggle to reliably detect voltage drops, particularly in battery-operated electrical machine tools, especially when using buffer capacitors, which can obscure the failure of rechargeable battery packs and prevent effective restart protection.
Innovation Solution
A device comprising a control capacitor connected between an anode and cathode connection, a measuring device to output a discharge signal based on potential difference, a discharge circuit, and a control device to evaluate the control capacitor's state of charge, allowing flexible detection of voltage drops with multiple rechargeable battery packs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If buffer capacitors are used to minimize overvoltages during clocking, then electrical stability is improved, but voltage drop detection reliability deteriorates because the capacitors obscure battery pack failures
Solution Approach 1:
The patent segments the detection function by using a separate control capacitor specifically for voltage drop detection, independent from the buffer capacitor used for electrical stability. This segmentation allows the detection circuit to monitor voltage drops without being influenced by the buffer capacitor's charge, thereby resolving the contradiction between electrical stability and detection reliability.
Solution Approach 2:
The control capacitor acts as an intermediary element between the power supply and the detection circuit. It is charged through a voltage divider and provides a controlled voltage signal to the control device, enabling accurate voltage drop detection while the buffer capacitor maintains electrical stability independently.
2Reliability
If restart protection is implemented to prevent unintended operation after voltage restoration, then safety is improved, but device complexity increases due to additional monitoring circuits
Solution Approach 1:
The patent merges the voltage drop detection function with the existing control device and power management circuitry. The control device evaluates the state of charge of the control capacitor and implements restart protection logic within the same control unit, avoiding the need for separate complex monitoring circuits while maintaining safety.
Solution Approach 2:
The control device is designed to perform multiple functions: it manages power distribution, monitors the control capacitor's state of charge, detects voltage drops, and implements restart protection. This multi-functionality reduces overall device complexity by consolidating safety and control functions into a single universal control unit.
3Ease of operation
If the operating switch is lockable in switch-on position for continuous operation, then ease of operation is improved, but risk of unintended start-up increases after voltage failure
Solution Approach 1:
The system applies preliminary anti-action by implementing restart protection that prevents the motor from starting after a voltage drop, even if the operating switch remains in the switch-on position. The control device monitors the control capacitor's state of charge and blocks motor operation until a proper restart sequence is initiated, countering the potential harmful effect of unintended start-up.
Solution Approach 2:
The control device continuously monitors the state of charge of the control capacitor and uses this feedback to control the motor's operation. When a voltage drop is detected (indicated by insufficient charge in the control capacitor), the system provides feedback to prevent motor operation, thereby eliminating the risk of unintended start-up while allowing continuous operation when voltage is stable.
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
Enables reliable detection of voltage drops and provides enhanced restart protection, even with buffered supply voltages and multiple battery packs, preventing unintended machine tool operation.
Implementation Method 1
a control capacitor (CK), whose first electrode is connected to the anode connection (6) and whose second electrode is connected to the cathode connection (7)
Implementation Method 2
a measuring device (13), which is designed to output a discharge signal (y) depending on a potential difference, which is detected between the anode connection (6) and the cathode connection (7), and a first threshold value for the potential difference
Data Source
AI summary
The invention relates to a device for detecting a voltage drop between an anode connection and a cathode connection, comprising: a control capacitor, of which the first electrode is connected to the anode connection and the second electrode is connected to the cathode connection; a measuring device, which is designed to output a discharge signal depending on a potential difference detected between the anode connection and the cathode connection and a first threshold value for the potential difference on a discharge control line; a discharge circuit which is connected to the discharge control line and is designed to discharge the control capacitor depending on the discharge signal; and a control device, which is designed to detect the voltage drop by evaluating the state of charge of the control capacitor.