Power Supply Shutdown Sequence Control for Motor Safety
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Solution Overview
Problem
Existing power supply devices with a two-converter configuration fail to properly manage the shutdown sequence during a power outage or cable disconnection, leading to unintended motor operation due to the control-system power source stopping before the driving-system power source, causing potential motor misbehavior.
Innovation Solution
A power supply device design that ensures the driving-system power source stops prior to the control-system power source by using a configuration with a first switching power source, a second switching power source, and controllers for each, along with an auxiliary winding for generating power supply voltage, allowing controlled shutdown of the driving-system power source before the control-system power source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the control-system power source stops before the driving-system power source during a power outage, then the control system can shut down properly, but the motor may continue unintended rotation due to loss of control
Solution Approach 1:
The patent applies preliminary action by detecting the power outage condition and commanding the driving-system power source to stop before the control-system power source shuts down. The control device detects when AC power is lost and actively controls the sequence to ensure the motor power stops first, preventing unintended motor rotation before the control system loses power.
2Object-affected harmful factors
If the driving-system power source stops prior to the control-system power source, then unintended motor operation is prevented, but the control system loses power while the motor is still running
Solution Approach 1:
The control device performs preliminary detection of power outage conditions and proactively commands the driving-system power source to stop before the control-system power source shuts down naturally. This preliminary action ensures the motor is stopped while the control system still has power to manage the shutdown sequence properly.
3Device complexity
If both power sources share the same power supply voltage from the auxiliary winding, then the circuit is simplified, but the shutdown sequence cannot be controlled during power outages
Solution Approach 1:
The patent applies segmentation by dividing the power supply system into two separate power supply voltages: one for the control-system power source and another for the driving-system power source. Although both are derived from the same auxiliary winding, they are separated into independent voltage lines that can be controlled independently, enabling the control device to manage the shutdown sequence of each power source separately during power outages.
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
This design prevents unintended motor operation by ensuring the driving-system power source stops before the control-system power source, maintaining system stability during power outages or cable disconnections.
Implementation Method 1
an auxiliary winding wound in the same winding direction as the primary winding; and a voltage generator configured to be connected to the auxiliary winding and to generate a power supply voltage for driving the first controller and the second controller
Data Source
AI summary
A power supply device includes first and second transformers, a first power source configured to output a first DC voltage from the first transformer, a second power source configured to output a second DC voltage from the second transformer, a first winding on a primary side of the first transformer, an auxiliary winding which is wound in the same winding direction as the first winding, and a voltage generator configured to be connected to the auxiliary winding and to generate a power supply voltage for driving a first controller of the first power source and a second controller of the second power source. When an AC voltage drops, control is performed such that the second controller stops prior to the first controller.