Control circuit for self-turn-off of an automatic machine
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Solution Overview
Problem
Traditional automatic coffee machine control circuits face issues with the self-turn-off function due to interruptions in the electric power supply to the logic controller, particularly when the transformer fails to maintain low output voltage during high input voltage absence, leading to the logic controller stopping operation.
Innovation Solution
A control circuit with a logic controller, a power supply, switches for load control, an electrically actuated deviator, and electrical energy storage means, such as condensers, ensuring continuous energy supply to the logic controller during deviator switching from deactivation to activation, using a secondary power line and a manual reactivation switch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a transformer is used to lower high input voltage to low output voltage for the logic controller, then the voltage compatibility is improved, but the logic controller stops working when high input voltage is absent during deviator switching
Solution Approach 1:
The system performs preliminary action by storing electrical energy in the capacitor before the deviator switching occurs. The capacitor is charged during normal operation when high voltage is present, so that when the deviator switches and high voltage becomes absent, the pre-stored energy in the capacitor immediately takes over to maintain the logic controller's operation without interruption.
Solution Approach 2:
The capacitor acts as an intermediary energy storage device between the high voltage power supply and the logic controller. It mediates the transition by absorbing excess energy when high voltage is present and releasing stored energy when high voltage becomes absent, thus smoothing out the power supply interruptions that would otherwise cause the logic controller to stop working.
2Productivity
If the deviator switches from deactivation to activation status, then the machine functionality is improved, but the power supply interruption causes the logic controller to stop working
Solution Approach 1:
The capacitor is pre-charged with electrical energy before the deviator switching event. This preliminary energy storage ensures that when the deviator switches from deactivation to activation status and causes a power supply interruption, the logic controller continues to operate without stopping, maintaining both machine functionality and control reliability.
Solution Approach 2:
The capacitor provides beforehand cushioning by storing energy in advance to cushion against the power supply interruption caused by deviator switching. This pre-prepared energy buffer protects the logic controller from the harmful effect of voltage absence during the switching transient, ensuring continuous operation.
3Reliability
If electrical energy storage means are added to maintain power supply during deviator switching, then the logic controller operation continuity is improved, but the device complexity increases
Solution Approach 1:
The invention uses a simple, inexpensive capacitor as the energy storage means rather than a complex battery system or sophisticated power management circuitry. The capacitor is a basic electronic component that provides the necessary energy buffering function with minimal complexity, making it a cost-effective and simple solution to maintain power supply continuity.
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
Guarantees the logic controller's continuous operation for the entire switching period of the deviator, exceeding the required duration by three times, ensuring reliable and prolonged machine functionality.
Implementation Method 1
electrical energy storage means, preferably comprising at least one condenser, which guarantee the supply of electrical energy for the low voltage supply of the logic controller for the entire time needed for the switching of the deviator
Data Source
Figure 1~2
Figure 3
AI summary
The control circuit for self-turn-off of an automatic machine, connectable to a domestic voltage power line (LI, L2), comprises a logic controller (1) having low electric power supply voltage, a power supply (2) for the logic controller (1), at least one switch (3) to control at least one electrical load (4, 5) of the machine, connected to the logic controller (1), an electrically actuated deviator (6 ) connected to the logic controller (1) and switchable between machine activation status, in which a main electric power line (7) of the power supply (2) is connected to the power line (L I, L2), and machine deactivation status, in which a secondary electric power line (8) of the power supply (2) is connected to the power line (LI, L2), having a switch (9) normally open activatable by a manual reactivation button on the machine, said normally open switch (9) being connected to the logic controller ( 1), and electrical energy storage means for maintaining the electric power supply of the logic controller (1) for the entire operating time of the deviator (6) switching, automatically generated by the closure of the reactivation switch (9), from machine deactivation status to activation status.