Circuit Arrangement for Holding Brake with Segmented Diodes
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Solution Overview
Problem
Electromagnetic holding brakes face issues with power loss and overvoltage peaks due to permanent free-wheeling current in the suppressor diode, which complicates rapid application and demagnetization of the brake.
Innovation Solution
A circuit arrangement with a switching unit and free-wheeling diode for controlled supply voltage during free-wheeling operation, bypassing the suppressor diode to reduce power loss, and using a suppressor diode for rapid demagnetization and braking, ensuring efficient energy use and safe brake management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a suppressor diode is connected in parallel to the inductance to suppress overvoltage peaks, then the holding brake and control electronics are protected against damage, but permanent free-wheeling current flows through the suppressor diode causing continuous power loss
Solution Approach 1:
The diode function is segmented into two separate components: a free-wheeling diode for normal operation and a suppressor diode for overvoltage protection. This segmentation allows each diode to be optimized for its specific function, with the suppressor diode only activating during overvoltage events rather than carrying continuous current
Solution Approach 2:
The free-wheeling diode acts as an intermediary component that handles the continuous current flow during normal operation, allowing the suppressor diode to remain inactive and avoid power losses. The free-wheeling diode mediates between the inductance and the rest of the circuit during steady-state operation
2Speed
If the holding brake is rapidly applied or rapidly demagnetized, then secure brake management is achieved, but very high overvoltage peaks occur requiring suppressor diode intervention
Solution Approach 1:
The suppressor diode serves as a mediator that activates only during rapid brake application or demagnetization events to clamp overvoltage peaks. During normal operation, it remains inactive, and the free-wheeling diode handles continuous current flow without causing power losses
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 reduces power loss during free-wheeling operation, allows rapid application of the brake, and maintains safe brake management by minimizing the influence of the suppressor diode, leading to energy-saving and cost-effective operation in electromagnetic holding brakes.
Implementation Method 1
the windings of the holding brake inductance aim to maintain the current flowing through them (free-wheeling current)
Implementation Method 2
The suppressor diode suppresses the overvoltage pulses arising through the inductance (for example to 39V), in that the surplus energy is consumed by it or conducted by it
Implementation Method 3
In the no-load state the friction surfaces are pressed together via the field of the permanent magnet
Implementation Method 4
with a rapid application of the holding brake or with a rapid de-magnetization respectively the windings of the holding brake inductance aim to maintain the current flowing through them
Data Source
AI summary
A circuit arrangement, especially for supplying an electromagnetic holding brake with a clocked supply voltage, includes a module for controlled provision of a clocked supply voltage for free-wheeling operation of the holding brake. The module has a switching unit for switching off the supply voltage for braking operation. A free-wheeling diode and a suppressor diode are connected in parallel to an inductance of the holding brake, with the free-wheeling diode being effective in free-wheeling operation only and the suppressor diode being effective in braking operation only.