Actuator Triggering Circuit With Watchdog Pulse Enable Logic
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Solution Overview
Problem
Current safety measures for electrical devices, such as washing machines, rely primarily on passive safety devices and lack active safety protocols to ensure functional safety during operation, which does not meet increasingly stringent safety standards.
Innovation Solution
A method and circuit arrangement where a monitoring device, acting as a watchdog circuit, emits a specific signal or pulse sequence only when the device is operating properly, enabling actuators, sensors, or consumers to receive control signals, and this signal is used to actively ensure safe operation by enabling or disabling them based on proper device functioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If passive safety devices are used to secure device operation, then safety requirements are partially met, but functional safety during operation is insufficient and stricter safety standards cannot be fulfilled
Solution Approach 1:
The patent implements a feedback mechanism where the control device emits a characteristic pulse sequence that is monitored by a monitoring device. The monitoring device detects the pulse sequence and generates a monitoring signal that feeds back to the control device. This closed-loop feedback system actively verifies proper device operation and enables or disables actuators accordingly, achieving active functional safety without requiring complex additional safety circuits.
Solution Approach 2:
The monitoring device serves multiple functions: it acts as a watchdog circuit to detect faults, a pulse sequence detector to verify proper operation, and an enabler/disabler for actuators based on detection results. By combining these functions into a single integrated monitoring device, the patent avoids increasing overall circuit complexity while achieving comprehensive active safety.
2Reliability
If watchdog circuits are used to monitor device operation, then faults can be detected, but the circuits remain inactive during proper operation and do not provide active safety
Solution Approach 1:
Instead of using a watchdog circuit that detects faults by monitoring for abnormal conditions, the patent inverts the approach by using a monitoring device that detects proper operation through a characteristic pulse sequence. The actuator enabling logic is inverted: actuators are enabled when proper operation is detected (presence of pulse sequence) and disabled when faults occur (absence or alteration of pulse sequence). This inversion transforms a passive fault-detection system into an active safety system.
3Reliability
If additional active safety measures are introduced to meet stricter safety standards, then functional safety is improved, but device complexity increases
Solution Approach 1:
The patent merges the safety monitoring function with the existing control device operations. The control device continues to emit its normal control signals, and the monitoring device utilizes these existing signals as the basis for safety verification. By combining the control function and safety monitoring function into an integrated system where the monitoring device observes the characteristic pulse sequences already present in normal operation, no additional complex safety circuits are required.
Data Source
Figure 1~2
AI summary
The aim of the invention is to safely trigger actuators (A) and/or sensors and/or consumers (V) in an electrical appliance, especially an electrical domestic appliance, which comprises the same, said actuators (A), sensors, or consumers (V) being fed control signals by an associated control device (ST) in order to be switched on. Said aim is achieved by the fact that the control device (ST) additionally supplies a separate series of signals or pulses, which is provided with at least one specific characteristic and whose occurrence is monitored, only if the electrical appliance functions properly, and the actuators (A) and/or sensors and/or consumers (V) are unblocked for receiving or executing the control signals fed thereto by the control device (ST) after only one such separate series of signals or pulses having said specific characteristic has been determined at the output end of the respective control device (ST).