Drive Inverter Voltage Connection Circuit
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Solution Overview
Problem
Existing technologies face challenges in ensuring safe and reliable disconnection of electrical machines from their power supply, particularly with high input voltages like 60V, leading to potential safety issues and high power losses during the safe torque-off function.
Innovation Solution
A device with a connection and disconnection circuit featuring redundant switching branches and a converter circuit, which includes a transformer and semiconductor switches, allows for safe and reliable disconnection of the drive inverter from the supply voltage, with a feedback loop for voltage regulation and power management, ensuring low power loss and intrinsic safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple switch is used to disconnect the supply voltage for safe torque-off function, then the device complexity is reduced, but the reliability and safety of the disconnection function deteriorates
Solution Approach 1:
The switching function is divided into two independent switching branches (first switching branch and second switching branch) that operate in parallel. Each branch can independently disconnect the supply voltage, providing redundant safety. This segmentation allows the system to maintain reliability even if one branch fails, while keeping each individual branch relatively simple in structure.
2Reliability
If the supply voltage is switched off completely during safe torque-off, then the safety function is achieved, but the control and monitoring capability of the system is lost
Solution Approach 1:
The sensor taps are positioned to detect voltage levels before complete disconnection occurs. The control device monitors these sensor signals during the switching process, allowing it to verify the disconnection state and maintain system awareness even as the supply voltage is being switched off. This preliminary monitoring action ensures safety while preserving operational awareness.
3Power
If high input voltage (>=60V) is used to power the drive inverter, then the power delivery capability is improved, but the power loss during switching operations increases
Solution Approach 1:
Sensor taps are connected between the semiconductor switches and diodes to provide real-time feedback on voltage levels to the control device. This feedback mechanism allows the control device to optimize switching timing and duration, minimizing the time high-voltage switches are in transition states where power loss occurs. The feedback enables precise control that reduces switching losses while maintaining high power delivery capability.
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
The solution enables reliable and safe disconnection of electrical machines from the power supply, even at high input voltages, while minimizing power loss and ensuring the safe torque-off function is triggered effectively, enhancing the intrinsic safety of the system.
Implementation Method 1
a converter circuit (4), which includes a transformer (T) with a primary side for receiving an input voltage (UE) and a secondary side for providing a regulated output voltage (UA)
Implementation Method 2
a semiconductor switch (V) on the primary side for switching the input voltage (UE)
Data Source
AI summary
The invention relates to a device and a method for connecting and reliably separating a voltage terminal (U2) of a drive inverter (3) for an electric machine (2) to or from a supply voltage (U1), comprising a connection and interruption circuit (20) with two switching branches (21, 22) connected between the supply voltage (U1) or the supply voltage terminal (19) and the voltage terminal (U2) of the drive inverter (3) and comprising a control and/or regulating device (6) which is programmed and/or the circuitry of which is designed to connect the supply voltage (U1) to the voltage terminal (U2) of the drive inverter (3) via the switching branches (21, 22) and to deactivate one of the switching branches (21, 22) in a first test mode and to read a sensor signal (SE1, SE2) from said switching branch (21, 22) while the other switching branch (22, 21) is activated and conducts the supply voltage (U1) to the voltage terminal (U2) of the drive inverter (3).