Feedback-Controlled Power Supply Shutdown Without Safety Contactors
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Solution Overview
Problem
Existing energy supply devices require complex wiring and additional switching devices for safety-oriented shut-down, leading to increased costs and potential failure risks due to contact welding.
Innovation Solution
An energy supply device with a transformer, power switching device, and feedback device, utilizing switching elements to interrupt control signals upon receiving a shut-down signal, such as an emergency stop, without the need for complex wiring or additional switching devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power circuit breakers and contactors are connected in series for safety-oriented shut-down, then safety reliability is improved, but device complexity and cost increase
Solution Approach 1:
The invention extracts the safety shut-down function from the power circuit and implements it in the control circuit. By removing the dependency on power circuit breakers and contactors for safety shutdown, the complex power switching devices are replaced with simple control signal interruption, significantly reducing device complexity while maintaining safety reliability.
Solution Approach 2:
The invention introduces an intermediary control signal as a mediator between the safety system and the power switching device. Instead of directly controlling power circuit breakers, the safety shutdown is achieved by interrupting the control signal that drives the power switching device, simplifying the overall system architecture.
2Reliability
If multiple independent contactors or relays are connected in series for emergency stop function, then safety integrity is improved, but the risk of contact welding increases
Solution Approach 1:
The invention replaces the mechanical contact-based safety shutdown system with an electronic control signal interruption system. By substituting mechanical contacts with electronic switching elements in the control circuit, the harmful effect of contact welding is eliminated while maintaining safety integrity.
3Reliability
If circuit breakers are used to short-circuit and brake downstream motors, then safety shutdown capability is improved, but additional switching devices and complex wiring are required
Solution Approach 1:
The invention merges the safety shutdown function with the existing control circuitry of the energy supply device. By integrating the safety shutdown capability into the control signal path, the need for separate circuit breakers and additional wiring is eliminated, reducing overall system complexity while maintaining shutdown capability.
Data Source
AI summary
An energy supply device includes: a transformer with a first winding; a power switching device; a feedback device; and a voltage supply device for providing supply voltage for the feedback device. The power switching device is coupled to the first winding and connects through periodically by a control signal generated by the feedback device. The feedback device includes a first switching element for interrupting the control signal when a shut-down signal occurs.