Switched-mode power supply mains failure detection circuit
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Solution Overview
Problem
Conventional switched-mode power supplies for electrically adjustable furniture lack efficient power failure detection capabilities, leading to potential motor shutdown and data loss during mains voltage failures, and result in high energy consumption and manufacturing complexity.
Innovation Solution
A controller with a switched-mode power supply that includes a start-up circuit and mains failure detection circuit, utilizing a signal from the start-up circuit to monitor mains voltage and signal failures to the control part, allowing for orderly motor stoppage and data storage, while reducing energy consumption and manufacturing complexity by operating in idle and normal states efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional switched-mode power supply is used without transformer-based voltage monitoring, then the power supply can operate with high efficiency and reduced component count, but the ability to detect mains voltage failure is lost
Solution Approach 1:
The start-up circuit is designed to perform multiple functions: it provides initial power to the control circuit during normal operation and simultaneously serves as the monitoring path for detecting mains voltage failure. By making the start-up circuit multi-functional, the patent avoids adding separate monitoring components while maintaining reliable failure detection capability.
Solution Approach 2:
The start-up circuit monitors its own operational status to detect mains voltage failure. The control circuit evaluates whether the start-up circuit is functioning normally, and if the start-up circuit fails to operate, this indicates a mains voltage failure. This self-monitoring approach eliminates the need for external monitoring hardware.
2Use of energy by moving object
If the switched-mode power supply operates continuously in normal mode, then all control circuits have constant power available, but energy consumption increases and stored energy depletes faster during mains failure
Solution Approach 1:
The switched-mode power supply alternates between normal operation mode and idle mode. During idle mode, minimal power is consumed and energy is stored in buffer capacities. The control circuit is designed to operate intermittently, drawing power only when needed. This periodic operation reduces overall energy consumption while ensuring that sufficient energy is stored to maintain controller operation during mains voltage failure.
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
Enables immediate detection and response to mains voltage failures, efficient use of stored energy, reduced energy consumption, and lower manufacturing costs, allowing for safer and more reliable operation of electrically adjustable furniture.
Implementation Method 1
the mains voltage is reduced to the lower voltage range of the DC motors, for example via a switched-mode power supply
Implementation Method 2
the relevant assemblies are supplied with power, for example via a start-up circuit, which makes available the energy required to start up the switching operation
Implementation Method 3
the switched-mode power supply has a mains failure detection circuit which, on the basis of a signal in the start-up circuit, is able to monitor whether a mains voltage present on the input side of the switched-mode power supply fails
Data Source
Figure 1~2
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Figure 5~6
AI summary
A control means comprises a control part (3) which is designed to actuate an electrically adjustable item of furniture, and a switched-mode power supply unit (2) which supplies power to the control part (3). The switched-mode power supply unit (2) has a switched-mode regulator module (223) for controlling the switched-mode power supply unit and can be switched to a normal operating state and to an inoperative state. The switched-mode power supply unit (2) is designed to provide a supply voltage for the switched-mode regulator module (223) in the inoperative state in a manner clocked by a start-up circuit (224). The switched-mode power supply unit (2) has a supply system failure identification circuit (230) which is designed to detect failure of a supply system voltage, which is applied to the input end of the switched-mode power supply unit (2), on the basis of a signal in the start-up circuit (224) and to indicate this to the control part (3).